Parasites, Hosts and Diseases

"STAT"

Brief Communication

Glucose-6-phosphate dehydrogenase variants in Kachin, Myanmar: Zin Moon, Ja Moon Aung, Dorene VanBik, Hae Soo Yun, Sanghyun Lee, Sylvatrie-Danne Dinzouna-Boutamba, Zau Ring, Yeonchul Hong, Dong-Il Chung, Youn-Kyoung Goo; Parasites Hosts Dis 2025;63(4):360-363.
Published online November 19, 2025; DOI: https://doi.org/10.3347/PHD.25053

Abstract
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Glucose-6-phosphate dehydrogenase (G6PD) deficiency is an X-linked recessive genetic disorder that can cause severe anemia in affected individuals exposed to oxidative stress. This risk is particularly relevant in patients treated with the antimalarial drug primaquine. In Myanmar, primaquine has been widely administered as a Plasmodium vivax malaria treatment; however, prevalence of G6PD deficiency among the population remains insufficiently characterized. This study investigated the prevalence of G6PD variants among various minority ethnic subgroups residing in Kachin State, Myanmar. Blood samples from 440 participants were analyzed; however, the Mahidol variant (G487A) was identified in 21 individuals (4.8%). A major limitation of this study was the absence of G6PD enzyme activity data to confirm whether the Mahidol variant induces G6PD deficiency.

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Original Articles

Identification of essential genes for Acanthamoeba castellanii excystation during encystation and excystation: Min-Jeong Kim, Hye-Jeong Jo, Fu-Shi Quan, Ki Back Chu, Hyun-Hee Kong, Eun-Kyung Moon; Parasites Hosts Dis 2024;62(4):399-407.
Published online November 22, 2024; DOI: https://doi.org/10.3347/PHD.24062

Acanthamoeba is an opportunistic pathogen that causes Acanthamoeba keratitis, granulomatous amoebic encephalitis, and other cutaneous diseases. The life cycle of Acanthamoeba consists of 2 stages of trophozoites and cysts. Under adverse environmental conditions, Acanthamoeba encysts, while the conditions become favorable for growth, it reverts to the trophozoite form. Acanthamoeba excystation is crucial for its proliferation and can lead to recurrent infections after incomplete treatment. To identify the factors involved in excystation, A. castellanii was subjected to either encystation- or excystation-inducing conditions, and gene expression profiles were compared using mRNA sequencing. A. castellanii samples were collected at 8 h intervals for analysis under both conditions. Differentially expressed gene analysis revealed that 1,214 and 1,163 genes were upregulated and downregulated, respectively, by more than 2-fold during early excystation. Five genes markedly upregulated in early excystation (ACA1_031140, ACA1_032330, ACA1_374400, ACA1_275740, and ACA1_112650) were selected, and their expression levels were confirmed via real-time PCR. Small interfering RNA (siRNA) targeting these 5 genes was transfected into Acanthamoeba and gene knockdown was validated through real-time PCR. The silencing of ACA1_031140, ACA1_032330, ACA1_374400, and ACA1_112650 inhibited excystation and suggested that these genes might be essential for excystation. Our findings provide valuable insights for suppressing Acanthamoeba proliferation and recurrence.

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Encystment and Excystment Processes in Acanthamoeba castellanii: An Emphasis on Cellulose Involvement
Mathew Choaji, Ascel Samba-Louaka, Zineb Fechtali-Moute, Willy Aucher, Sébastien Pomel
Pathogens.2025; 14(3): 268. CrossRef
Integrating molecular pathogenesis and predictive modelling in granulomatous amoebic encephalitis due to Acanthamoeba : a digital twin framework for personalised therapy
Ruqaiyyah Siddiqui, David Lloyd, Naveed Ahmed Khan
Infectious Diseases.2025; : 1. CrossRef
Microarray-based characterization of airway inflammation induced by environmental Acanthamoeba exposure versus the ovalbumin-alum model
Shin Ae Kang, Hak Sun Yu
Parasites, Hosts and Diseases.2025; 63(4): 327. CrossRef

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Identification of the protease inhibitory domain of Trichinella spiralis novel cystatin (TsCstN): Thassanee Yuthithum, Orawan Phuphisut, Onrapak Reamtong, Nathamon Kosoltanapiwat, Salisa Chaimon, Porntida Kobpornchai, Charin Thawornkuno, Preeyarat Malaithong, Orathai Sawatdichaikul, Poom Adisakwattana; Parasites Hosts Dis 2024;62(3):330-341.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.24026

The Trichinella spiralis novel cystatin (TsCstN) inhibits cathepsin L (CatL) activity and inflammation of macrophages during lipopolysaccharide (LPS) induction. To identify the protease inhibitory region, this study applied an in silico modeling approach to simulate truncation sites of TsCstN (Ts01), which created four truncated forms, including TsCstN^∆1-39 (Ts02), TsCstN^∆1-71 (Ts03), TsCstN^{∆1-20, ∆73-117} (Ts04), and TsCstN^{∆1-20, ∆42-117} (Ts05). The superimposition of these truncates modeled with AlphaFold Colab indicated that their structures were more akin to Ts01 than those modeled with I-TASSER. Moreover, Ts04 exhibited the closest resemblance to the structure of Ts01. The recombinant Ts01 (rTs01) and truncated proteins (rTs02, rTs03, and rTs04) were successfully expressed in a prokaryotic expression system while Ts05 was synthesized, with sizes of approximately 14, 12, 8, 10, and 2.5 kDa, respectively. When determining the inhibition of CatL activity, both rTs01 and rTs04 effectively reduced CatL activity in vitro. Thus, the combination of the α1 and L1 regions may be sufficient to inhibit CatL. This study provides comprehensive insights into TsCstN, particularly regarding its protein function and inhibitory domains against CatL.

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Systems biology of Haemonchus contortus – Advancing biotechnology for parasitic nematode control
Yuanting Zheng, Neil D. Young, Tao Wang, Bill C.H. Chang, Jiangning Song, Robin B. Gasser
Biotechnology Advances.2025; 81: 108567. CrossRef
Therapeutic potentials of Trichinella spiralis in immune disorders: From allergy to autoimmunity
Minkyoung Cho, Hak Sun Yu
Parasites, Hosts and Diseases.2025; 63(2): 123. CrossRef

2,616 View
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Prostaglandin synthase activity of sigma- and mu-class glutathione transferases in a parasitic trematode, Clonorchis sinensis: Jiyoung Kim, Woon-Mok Sohn, Young-An Bae; Parasites Hosts Dis 2024;62(2):205-216.
Published online May 27, 2024; DOI: https://doi.org/10.3347/PHD.24004

Sigma-class glutathione transferase (GST) proteins with dual GST and prostaglandin synthase (PGS) activities play a crucial role in the establishment of Clonorchis sinensis infection. Herein, we analyzed the structural and enzymatic properties of sigma-class GST (CsGST-σ) proteins to obtain insight into their antioxidant and immunomodulatory functions in comparison with mu-class GST (CsGST-μ) proteins. CsGST-σ proteins conserved characteristic structures, which had been described in mammalian hematopoietic prostaglandin D₂ synthases. Recombinant forms of these CsGST-σ and CsGST-μ proteins expressed in Escherichia coli exhibited considerable degrees of GST and PGS activities with substantially different specific activities. All recombinant proteins displayed higher affinities toward prostaglandin H₂ (PGS substrate; average Km of 30.7 and 3.0 μm for prostaglandin D₂ [PGDS] and E₂ synthase [PGES], respectively) than those toward CDNB (GST substrate; average K_m of 1,205.1 μm). Furthermore, the catalytic efficiency (K_cat/K_m) of the PGDS/PGES activity was higher than that of GST activity (average K_cat/K_m of 3.1, 0.7, and 7.0×10^-3 s^-1μm^-1 for PGDS, PGES, and GST, respectively). Our data strongly suggest that the C. sinensis sigma- and mu-class GST proteins are deeply involved in regulating host immune responses by generating PGD₂ and PGE₂ in addition to their roles in general detoxification.

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Toxoplasma gondii IST suppresses inflammatory and apoptotic responses by inhibiting STAT1-mediated signaling in IFN-γ/TNF-α-stimulated hepatocytes: Seung-Hwan Seo, Ji-Eun Lee, Do-Won Ham, Eun-Hee Shin; Parasites Hosts Dis 2024;62(1):30-41.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23129

The dense granule protein of Toxoplasma gondii, inhibitor of signal transducer and activator of transcription 1 (IST) is an inhibitor of signal transducer and activator of transcription 1 (STAT1) transcriptional activity that binds to STAT1 and regulates the expression of inflammatory molecules in host cells. A sterile inflammatory liver injury in pathological acute liver failures occurs when excessive innate immune function, such as the massive release of IFN-γ and TNF-α, is activated without infection. In relation to inflammatory liver injury, we hypothesized that Toxoplasma gondii inhibitor of STAT1 transcription (TgIST) can inhibit the inflammatory response induced by activating the STAT1/IRF-1 mechanism in liver inflammation. This study used IFN-γ and TNF-α as inflammatory inducers at the cellular level of murine hepatocytes (Hepa-1c1c7) to determine whether TgIST inhibits the STAT1/IRF-1 axis. In stable cells transfected with TgIST, STAT1 expression decreased with a decrease in interferon regulatory factor (IRF)-1 levels. Furthermore, STAT1 inhibition of TgIST resulted in lower levels of NF-κB and COX2, as well as significantly lower levels of class II transactivator (CIITA), iNOS, and chemokines (CLXCL9/10/11). TgIST also significantly reduced the expression of hepatocyte proapoptotic markers (Caspase3/8/9, P53, and BAX), which are linked to sterile inflammatory liver injury. TgIST also reduced the expression of adhesion (ICAM-1 and VCAM-1) and infiltration markers of programmed death-ligand 1 (PD-L1) induced by hepatocyte and tissue damage. TgIST restored the cell apoptosis induced by IFN-γ/TNF-α stimulation. These results suggest that TgIST can inhibit STAT1-mediated inflammatory and apoptotic responses in hepatocytes stimulated with proinflammatory cytokines.

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Toxoplasma GRA16 attenuates Tau hyperphosphorylation and enhances autophagy in thrombin-treated HT-22 hippocampal neuronal cells
Seung-Hwan Seo, Do-Won Ham, Ji-Eun Lee, Eun-Hee Shin
Scientific Reports.2025;[Epub] CrossRef
Toxoplasma gondii GRA16 Suppresses Aerobic Glycolysis by Downregulating c-Myc and TERT Expressions in Colorectal Cancer Cells
Ji-Eun Lee, Seung-Hwan Seo, Do-Won Ham, Eun-Hee Shin
Biomolecules & Therapeutics.2025; 33(4): 621. CrossRef

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Brief Communication

Correlation of endemicity between monogenean trematode, Microcotyle sebastis, and parasitic copepods in Korean rockfish, Sebastes schlegelii, from a fish farm in Tongyeong-si, Gyeongsangnam-do, Korea: Won-Sik Woo, Gyoungsik Kang, Kyung-Ho Kim, Ha-Jeong Son, Min-Young Sohn, Chan-Il Park; Parasites Hosts Dis 2023;61(3):332-337.
Published online August 21, 2023; DOI: https://doi.org/10.3347/PHD.23019

Abstract
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Infestations of parasites, particularly those caused by copepods and monogeneans, are a major hindrance to aquaculture and have a big negative economic impact. Sebastes schlegelii, a farmed Korean rockfish, is particularly prone to copepods and monogeneans. This study comprehended how parasitic copepods and rockfish from a farm in Tongyeong-si, Gyeongsangnam-do, Korea, are related to the monogenean trematode Microcotyle sebastis. Our research revealed that monogeneans predominated, with a rate of 98.4% and an average infection intensity of 7 per infected fish. With an average infection intensity of 4 per sick fish, the infection rate for parasitic copepods was equally considerable, coming in at 91.7%. The high co-infection rate of both parasite families, at 90.8%, is noteworthy. Furthermore, Lepeophtheirus elegans and Peniculus truncatus, 2 parasitic copepod species, were discovered to have M. sebastis eggs attached to their bodies. This demonstrates a connection between parasitic copepod infestations in farmed Korean rockfish and the monogenean trematode M. sebastis. These discoveries highlight the necessity for creating more potent parasite control methods for the aquaculture sector and shed light on the intricate relationships between various parasite species.

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Evidence of gill migration in monogenean polyopisthocotylean Microcotyle sebastis larvae infesting Korean rockfish (Sebastes schlegelii)
Won-Sik Woo, Gyoungsik Kang, Kyung-Ho Kim, Ha-Jeong Son, Min-Young Sohn, Min-Soo Joo, Chan-Il Park
Aquaculture Reports.2024; 39: 102398. CrossRef

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Original Article

Prevalence and molecular analysis of glucose-6-phosphate dehydrogenase deficiency in Chin State, Myanmar: Ja Moon Aung, Zin Moon, Dorene VanBik, Sylvatrie-Danne Dinzouna-Boutamba, Sanghyun Lee, Zau Ring, Dong-Il Chung, Yeonchul Hong, Youn-Kyoung Goo; Parasites Hosts Dis 2023;61(2):154-162.
Published online May 23, 2023; DOI: https://doi.org/10.3347/PHD.23004

Glucose-6-phosphate dehydrogenase (G6PD) deficiency is caused by X-linked recessive disorderliness. It induces severe anemia when a patient with G6PD deficiency is exposed to oxidative stress that occurs with administration of an antimalarial drug, primaquine. The distribution of G6PD deficiency remains unknown while primaquine has been used for malaria treatment in Myanmar. This study aimed to investigate the prevalence of G6PD deficiency and its variants in Chin State, Myanmar. Among 322 participants, 18 (11 males and 7 females) demonstrated a G6PD deficiency. Orissa variant was dominant in the molecular analysis. This would be related to neighboring Indian and Bangladeshi population, in which Orissa variant was also reported as the main mutation type. The screening test for G6PD deficiency before primaquine treatment appears to be important in Myanmar.

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Glucose-6-phosphate dehydrogenase variants in Kachin, Myanmar
Zin Moon, Ja Moon Aung, Dorene VanBik, Hae Soo Yun, Sanghyun Lee, Sylvatrie-Danne Dinzouna-Boutamba, Zau Ring, Yeonchul Hong, Dong-Il Chung, Youn-Kyoung Goo
Parasites, Hosts and Diseases.2025; 63(4): 360. CrossRef
Genetic diversity of Plasmodium falciparum erythrocyte membrane protein 1 in field isolates: Correspondence
Amnuay Kleebayoon, Viroj Wiwanitkit
Parasites, Hosts and Diseases.2023; 61(3): 338. CrossRef

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Mini Review

Inflammatory response to Trichomonas vaginalis in the pathogenesis of prostatitis and benign prostatic hyperplasia: Ik-Hwan Han, Jung-Hyun Kim, Jae-Sook Ryu; Parasites Hosts Dis 2023;61(1):2-14.
Published online February 22, 2023; DOI: https://doi.org/10.3347/PHD.22160

Abstract
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Trichomonas vaginalis is a flagellated protozoan that causes trichomoniasis, a common nonviral sexually transmitted infection. T. vaginalis infection is asymptomatic in most infected men but can lead to chronic infection. The inflammatory response to chronic T. vaginalis infection may contribute to prostatic diseases, such as prostatitis and benign prostatic hyperplasia (BPH); however, studies on the relationship between T. vaginalis infection and prostate diseases are scarce. In this review, we discuss evidence from our studies on the involvement of T. vaginalis in the pathogenesis of prostate diseases, such as prostatitis and BPH. Studies of prostatitis have demonstrated that the attachment of T. vaginalis trophozoite to prostate epithelial cells (PECs) induces inflammatory cytokine production and inflammatory cell migration, leading to prostatitis. T. vaginalis also causes pathological changes, such as inflammatory cell infiltration, acinar changes, interstitial fibrosis, and mast cell infiltration, in prostate tissues of infected rats. Thus, T. vaginalis is considered an infectious agent that triggers prostatitis. Meanwhile, studies of prostatic hyperplasia revealed that mast cells activated by T. vaginalis-infected prostate cells secreted inflammatory mediators, such as β-hexosaminidase and tryptase, which promoted proliferation of prostate stromal cell (PSC). Moreover, interleukin-6 produced by proliferating PSCs induced the multiplication of BPH-1 epithelial cells as a result of stromal–epithelial interaction, suggesting that the proliferation of T. vaginalis-infected prostate cells can be induced through crosstalk with mast cells. These collective findings suggest that T. vaginalis contributes to the progression of prostatitis and prostatic hyperplasia by creating an inflammatory microenvironment involving PECs and PSCs.

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Immunomodulatory roles of autophagic flux and IFIT in human ectocervical cells upon Trichomonas vaginalis infection
Ching-Chun Liu, Lichieh Julie Chu, Yuan-Ming Yeh, Hsin-Chung Lin, Lih-Chyang Chen, Ching-Yun Huang, Shu-Fang Chiu, Fang-Wen Cheng, Wei-Ning Lin, Kuo-Yang Huang
International Immunopharmacology.2025; 155: 114643. CrossRef
Detection of trichomonads in induced sputum from asthma patients in Korea
Myung-hee Yi, Myungjun Kim, Jun Ho Choi, Yoon Hee Cho, Hyun Kyung Oh, Jung-Won Park, Ju Yeong Kim
Parasites, Hosts and Diseases.2025; 63(3): 254. CrossRef
Interplay of obesity and parasitic infection: current evidence of immunogenesis, tumorigenesis and leptin receptor involvement
Enas El Saftawy, Mansour Alghamdi, Basma Emad Aboulhoda
Nutrition & Metabolism.2025;[Epub] CrossRef
The Past, Present, and Future in the Diagnosis of a Neglected Sexually Transmitted Infection: Trichomoniasis
Alexandra Ibáñez-Escribano, Juan José Nogal-Ruiz
Pathogens.2024; 13(2): 126. CrossRef
Evaluation of the clinical application value of cytokine expression profiles in the differential diagnosis of prostate cancer
Rongfa Chen, Linna Liu, Hui Chen, Chao Xing, Tingting Zhang, Yilin Pang, Xunjun Yang
Cancer Immunology, Immunotherapy.2024;[Epub] CrossRef
CysLT receptor-mediated NOX2 activation is required for IL-8 production in HMC-1 cells induced by Trichomonas vaginalis-derived secretory products
Young Ah Lee, Myeong Heon Shin
Parasites, Hosts and Diseases.2024; 62(3): 270. CrossRef
Dynamin 2-mediated endocytosis of BLT1 is required for IL-8 production in HMC-1 cells induced by Trichomonas vaginalis-derived secretory products
Young Ah Lee, Myeong Heon Shin
Parasites, Hosts and Diseases.2024; 62(3): 281. CrossRef

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Brief Communication

Updates on parasite infection prevalence in the Joseon period based on parasitological studies of human coprolites isolated from archaeological sites in the cities of Euijeongbu, Gumi, and Wonju: Chang Seok Oh, Jong-Yil Chai, Sori Min, Kyong Taek Oh, Jeonghwan Seol, Mi Kyung Song, Dong Hoon Shin, Min Seo; Parasites Hosts Dis 2023;61(1):89-93.
Published online February 22, 2023; DOI: https://doi.org/10.3347/PHD.22129

Abstract
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Parasite infection rates estimated by examining ancient coprolites can provide insights into parasitism in Joseon society. Using newly discovered Joseon period cases is essential to regularly update the parasite infection rates and reinforce the reliability of our previous estimations. In the present study, we investigated parasite infections in Joseon coprolites newly isolated from the cities of Euijeongbu, Gumi, and Wonju. We then updated the overall parasite infection rates of Joseon period samples (n= 30) as follows: 86.7% (26/30) for Trichuris trichiura, 56.7% (17/30) for Ascaris lumbricoides, 30.0% (9/30) for Clonorchis sinensis, and 30.0% (9/30) for Paragonimus westermani. The parasite infection rates in the Joseon society, estimated through coprolite examination, were very similar to those determined previously despite the addition of new cases to the existing data pool.

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A parasitological study on the possible toilet ruins of the Japanese colonial period in Korea
Jieun Kim, Min Seo, Hisashi Fujita, Jong Yil Chai, Jin Woo Park, Jun Won Jang, In Soo Jang, Dong Hoon Shin
Parasites, Hosts and Diseases.2023; 61(2): 198. CrossRef
Paleoparasitology research on ancient helminth eggs and larvae in the Republic of Korea
Jong-Yil Chai, Min Seo, Dong Hoon Shin
Parasites, Hosts and Diseases.2023; 61(4): 345. CrossRef

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Original Articles

Molecular Characteristics and Potent Immunomodulatory Activity of Fasciola hepatica Cystatin: Kai Zhang, Yucheng Liu, Guowu Zhang, Xifeng Wang, Zhiyuan Li, Yunxia Shang, Chengcheng Ning, Chunhui Ji, Xuepeng Cai, Xianzhu Xia, Jun Qiao, Qingling Meng; Korean J Parasitol 2022;60(2):117-126.
Published online April 20, 2022; DOI: https://doi.org/10.3347/kjp.2022.60.2.117

Cystatin, a cysteine protease inhibitor found in many parasites, plays important roles in immune evasion. This study analyzed the molecular characteristics of a cystatin from Fasciola hepatica (FhCystatin) and expressed recombinant FhCystatin (rFhcystatin) to investigate the immune modulatory effects on lipopolysaccharide-induced proliferation, migration, cytokine secretion, nitric oxide (NO) production, and apoptosis in mouse macrophages. The FhCystatin gene encoded 116 amino acids and contained a conserved cystatin-like domain. rFhCystatin significantly inhibited the activity of cathepsin B. rFhCystatin bound to the surface of mouse RAW264.7 cells, significantly inhibited cell proliferation and promoted apoptosis. Moreover, rFhCystatin inhibited the expression of cellular nitric oxide, interleukin-6, and tumor necrosis factor-α, and promoted the expression of transforming growth factor-β and interleukin-10. These results showed that FhCystatin played an important role in regulating the activity of mouse macrophages. Our findings provide new insights into mechanisms underlying the immune evasion and contribute to the exploration of potential targets for the development of new drug to control F. hepatica infection.

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Cystatin from the helminth Ascaris lumbricoides upregulates mevalonate and cholesterol biosynthesis pathways and immunomodulatory genes in human monocyte-derived dendritic cells
Nathalie Acevedo, Ana Lozano, Josefina Zakzuk, Kevin Llinás-Caballero, David Brodin, Peter Nejsum, Andrew R. Williams, Luis Caraballo
Frontiers in Immunology.2024;[Epub] CrossRef
Helminth-derived molecules: Pathogenic and pharmacopeial roles
Yu Zhang, Chunxiang Shen, Xinyi Zhu, Chiuan Yee Leow, Minjun Ji, Zhipeng Xu
The Journal of Biomedical Research.2024; 38(6): 547. CrossRef
An evolutionary molecular adaptation of an unusual stefin from the liver fluke Fasciola hepatica redefines the cystatin superfamily
Michal Buša, Zuzana Matoušková, Pavla Bartošová-Sojková, Petr Pachl, Pavlína Řezáčová, Ramon Marc Eichenberger, Peter Deplazes, Martin Horn, Saša Štefanić, Michael Mareš
Journal of Biological Chemistry.2023; 299(3): 102970. CrossRef
Type I Cystatin Derived from Fasciola gigantica Suppresses Macrophage-Mediated Inflammatory Responses
Pathanin Chantree, Mayuri Tarasuk, Parisa Prathaphan, Jittiporn Ruangtong, Mantana Jamklang, Sirilak Chumkiew, Pongsakorn Martviset
Pathogens.2023; 12(3): 395. CrossRef
Cystatins from the Human Liver Fluke Opisthorchis viverrini: Molecular Characterization and Functional Analysis
Amornrat Geadkaew-Krenc, Rudi Grams, Sinee Siricoon, Nanthawat Kosa, Dawid Krenc, Wansika Phadungsil, Pongsakorn Martviset
Pathogens.2023; 12(7): 949. CrossRef
Antigens from the Helminth Fasciola hepatica Exert Antiviral Effects against SARS-CoV-2 In Vitro
Judit Serrat, Clara Francés-Gómez, David Becerro-Recio, Javier González-Miguel, Ron Geller, Mar Siles-Lucas
International Journal of Molecular Sciences.2023; 24(14): 11597. CrossRef
Cysticercus pisiformis-derived novel-miR1 targets TLR2 to inhibit the immune response in rabbits
Guoliang Chen, Guiting Pu, Liqun Wang, Yanping Li, Tingli Liu, Hong Li, Shaohua Zhang, Xuelin Wang, Xiaolei Liu, Xuenong Luo
Frontiers in Immunology.2023;[Epub] CrossRef
Fasciolosis: pathogenesis, host-parasite interactions, and implication in vaccine development
Luis Miguel Flores-Velázquez, María Teresa Ruiz-Campillo, Guillem Herrera-Torres, Álvaro Martínez-Moreno, Francisco Javier Martínez-Moreno, Rafael Zafra, Leandro Buffoni, Pablo José Rufino-Moya, Verónica Molina-Hernández, José Pérez
Frontiers in Veterinary Science.2023;[Epub] CrossRef

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Sirtinol Supresses Trophozoites Proliferation and Encystation of Acanthamoeba via Inhibition of Sirtuin Family Protein: So-Young Joo, Ja Moon Aung, Minsang Shin, Eun-Kyung Moon, Hyun-Hee Kong, Youn-Kyoung Goo, Dong-Il Chung, Yeonchul Hong; Korean J Parasitol 2022;60(1):1-6.
Published online February 23, 2022; DOI: https://doi.org/10.3347/kjp.2022.60.1.1

Abstract
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The encystation of Acanthamoeba leads to the development of metabolically inactive and dormant cysts from vegetative trophozoites under unfavorable conditions. These cysts are highly resistant to anti-Acanthamoeba drugs and biocides. Therefore, the inhibition of encystation would be more effective in treating Acanthamoeba infection. In our previous study, a sirtuin family protein—Acanthamoeba silent-information regulator 2-like protein (AcSir2)—was identified, and its expression was discovered to be critical for Acanthamoeba castellanii proliferation and encystation. In this study, to develop Acanthamoeba sirtuin inhibitors, we examine the effects of sirtinol, a sirtuin inhibitor, on trophozoite growth and encystation. Sirtinol inhibited A. castellanii trophozoites proliferation (IC50=61.24 μM). The encystation rate of cells treated with sirtinol significantly decreased to 39.8% (200 μM sirtinol) after 24 hr of incubation compared to controls. In AcSir2-overexpressing cells, the transcriptional level of cyst-specific cysteine protease (CSCP), an Acanthamoeba cysteine protease involved in the encysting process, was 11.6- and 88.6-fold higher at 48 and 72 hr after induction of encystation compared to control. However, sirtinol suppresses CSCP transcription, resulting that the undegraded organelles and large molecules remained in sirtinol-treated cells during encystation. These results indicated that sirtinol sufficiently inhibited trophozoite proliferation and encystation, and can be used to treat Acanthamoeba infections.

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Pterostilbene: A natural neuroprotective stilbene with anti-Alzheimer's disease properties
Songlan Gao, Honglei Zhang, Na Li, Lijuan Zhang, Zhe Zhu, Changlu Xu
Journal of Pharmaceutical Analysis.2025; 15(4): 101043. CrossRef
Alzheimer’s Disease: A Review of Molecular Mechanisms and Therapeutic Implications by Targeting Sirtuins, Caspases, and GSK-3
Kalpana Pandya, Krishnashish Roul, Avanish Tripathi, Sateesh Belemkar, Anshuman Sinha, Meryem Erol, Devendra Kumar
ACS Chemical Neuroscience.2025; 16(12): 2178. CrossRef
Human Conjunctival Transcriptome in Acanthamoeba Keratitis: An Exploratory Study
Gerami D. Seitzman, Jeremy D. Keenan, Thomas M. Lietman, Kevin Ruder, Lina Zhong, Cindi Chen, YuHeng Liu, Danny Yu, Thomas Abraham, Armin Hinterwirth, Thuy Doan
Cornea.2024; 43(10): 1272. CrossRef
Comparative cytotoxicity of Acanthamoeba castellanii-derived conditioned medium on human corneal epithelial and stromal cells
Abdullah Alhazmi, Laura E. Sidney, Andy Hopkinson, Hany M. Elsheikha
Acta Tropica.2024; 257: 107288. CrossRef
Biological characteristics and pathogenicity of Acanthamoeba
Yuehua Wang, Linzhe Jiang, Yitong Zhao, Xiaohong Ju, Le Wang, Liang Jin, Ryan D. Fine, Mingguang Li
Frontiers in Microbiology.2023;[Epub] CrossRef

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Involvement of Macrophages in Proliferation of Prostate Cancer Cells Infected with Trichomonas vaginalis: Kyu-Shik Kim, Hong-Sang Moon, Sang-Su Kim, Jae-Sook Ryu; Korean J Parasitol 2021;59(6):557-564.
Published online December 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.6.557

Abstract
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Macrophages play a key role in chronic inflammation, and are the most abundant immune cells in the tumor microenvironment. We investigated whether an interaction between inflamed prostate cancer cells stimulated with Trichomonas vaginalis and macrophages stimulates the proliferation of the cancer cells. Conditioned medium was prepared from T. vaginalis-infected (TCM) and uninfected (CM) mouse prostate cancer (PCa) cell line (TRAMP-C2 cells). Thereafter conditioned medium was prepared from macrophages (J774A.1 cell line) after incubation with CM (MCM) or TCM (MTCM). When TRAMP-C2 cells were stimulated with T. vaginalis, protein and mRNA levels of CXCL1 and CCL2 increased, and migration of macrophages toward TCM was more extensive than towards CM. Macrophages stimulated with TCM produced higher levels of CCL2, IL-6, TNF-α, their mRNAs than macrophages stimulated with CM. MTCM stimulated the proliferation and invasiveness of TRAMP-C2 cells as well as the expression of cytokine receptors (CCR2, GP130, CXCR2). Importantly, blocking of each cytokine receptors with anti-cytokine receptor antibody significantly reduced the proliferation and invasiveness of TRAMP-C2 cells. We conclude that inflammatory mediators released by TRAMP-C2 cells in response to infection by T. vaginalis stimulate the migration and activation of macrophages and the activated macrophages stimulate the proliferation and invasiveness of the TRAMP-C2 cells via cytokine-cytokine receptor binding. Our results therefore suggested that macrophages contribute to the exacerbation of PCa due to inflammation of prostate cancer cells reacted with T. vaginalis.

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The role of proinflammatory cytokines and CXC chemokines (CXCL1–CXCL16) in the progression of prostate cancer: insights on their therapeutic management
Amin Ullah, Wang Jiao, Bairong Shen
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CysLT receptor-mediated NOX2 activation is required for IL-8 production in HMC-1 cells induced by Trichomonas vaginalis-derived secretory products
Young Ah Lee, Myeong Heon Shin
Parasites, Hosts and Diseases.2024; 62(3): 270. CrossRef
Point-of-Care Diagnostic for Trichomonas vaginalis, the Most Prevalent, Non-Viral Sexually Transmitted Infection
John F. Alderete, Hermes Chan
Pathogens.2023; 12(1): 77. CrossRef

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Electrophysiological Properties of Ion Channels in Ascaris suum Tissue Incorporated into Planar Lipid Bilayers: Kwon Moo Park, Sun-Don Kim, Jin Bong Park, Sung-Jong Hong, Pan Dong Ryu; Korean J Parasitol 2021;59(4):329-339.
Published online August 18, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.4.329

Abstract
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Ion channels are important targets of anthelmintic agents. In this study, we identified 3 types of ion channels in Ascaris suum tissue incorporated into planar lipid bilayers using an electrophysiological technique. The most frequent channel was a large-conductance cation channel (209 pS), which accounted for 64.5% of channels incorporated (n=60). Its open-state probability (P_o) was ~0.3 in the voltage range of –60~+60 mV. A substate was observed at 55% of the main-state. The permeability ratio of Cl^- to K⁺ (P_Cl/P_K) was ~0.5 and P_Na/P_K was 0.81 in both states. Another type of cation channel was recorded in 7.5% of channels incorporated (n=7) and discriminated from the large-conductance cation channel by its smaller conductance (55.3 pS). Its Po was low at all voltages tested (~0.1). The third type was an anion channel recorded in 27.9% of channels incorporated (n=26). Its conductance was 39.0 pS and P_Cl/P_K was 8.6±0.8. P_o was ~1.0 at all tested potentials. In summary, we identified 2 types of cation and 1 type of anion channels in Ascaris suum. Gating of these channels did not much vary with voltage and their ionic selectivity is rather low. Their molecular nature, functions, and potentials as anthelmintic drug targets remain to be studied further.

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Signaling Role of Adipocyte Leptin in Prostate Cell Proliferation Induced by Trichomonas vaginalis: Jung-Hyun Kim, Ik-Hwan Han, Su-Jin Shin, Sung-Yul Park, Hyo-Yeoung Chung, Jae-Sook Ryu; Korean J Parasitol 2021;59(3):235-249.
Published online June 21, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.3.235

Abstract
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Leptin is a type of adipokine mainly produced by adipocytes and reported to be overproduced in prostate cancer. However, it is not known whether it stimulates the proliferation of prostate cells. In this study, we investigated whether benign prostatic hyperplasia epithelial cells (BPH-1 cells) infected with Trichomonas vaginalis induced the proliferation of prostate cells via a leptin signaling pathway. To investigate the effect of crosstalk between adipocyte leptin and inflamed epithelial cell in proliferation of prostate cells, adipocytes 3T3-L1 cells were incubated in conditioned medium of BPH-1 cells infected with T. vaginalis (T. vaginalis-conditioned medium, TCM), and then the adipocyte-conditioned medium (ATCM) was identified to cause proliferation of prostate cells. BPH-1 cells incubated with live T. vaginalis released pro-inflammatory cytokines, and conditioned medium of these cells caused migration of adipocytes. When prostate stromal cells and BPH-1 cells were incubated with adipocyte conditioned medium containing leptin, their growth rates increased as did expression of the leptin receptor (known as OBR) and signaling molecules such as JAK2/STAT3, Notch and survivin. Moreover, blocking the OBR reduced this proliferation and the expression of leptin signaling molecules in response to ATCM. In conclusion, our findings show that inflamed BPH-1 cells infected with T. vaginalis induce the proliferation of prostate cells through leptin-OBR signaling. Therefore, it is likely that T. vaginalis contributes to prostate enlargement in BPH via adipocyte leptin released as a result of inflammation of the prostate.

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Interplay of obesity and parasitic infection: current evidence of immunogenesis, tumorigenesis and leptin receptor involvement
Enas El Saftawy, Mansour Alghamdi, Basma Emad Aboulhoda
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Intrinsic and extrinsic factors causing hyperplasia of the prostate
Yuki Kyoda, Kosuke Shibamori, Tetsuya Shindo, Takeshi Maehana, Kohei Hashimoto, Ko Kobayashi, Toshiaki Tanaka, Fumimasa Fukuta, Naoya Masumori
International Journal of Urology.2024; 31(7): 705. CrossRef
Association between metabolic syndrome and benign prostatic hyperplasia: The underlying molecular connection
Xun Fu, Yutao Wang, Yi Lu, Jiang Liu, Hongjun Li
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Point-of-Care Diagnostic for Trichomonas vaginalis, the Most Prevalent, Non-Viral Sexually Transmitted Infection
John F. Alderete, Hermes Chan
Pathogens.2023; 12(1): 77. CrossRef
Trichomonas vaginalis excretory secretory proteins reduce semen quality and male fertility
Zhenchao Zhang, Fakun Li, Yangyang Deng, Yuhua Li, Wanxin Sheng, Xiaowei Tian, Zhenke Yang, Shuai Wang, Lihua Guo, Lixia Hao, Xuefang Mei
Acta Tropica.2023; 238: 106794. CrossRef
The correlation between Trichomonas vaginalis infection and reproductive system cancer: a systematic review and meta-analysis
Zhenchao Zhang, Dongxian Li, Yuhua Li, Rui Zhang, Xianghuan Xie, Yi Yao, Linfei Zhao, Xiaowei Tian, Zhenke Yang, Shuai Wang, Xuejing Yue, Xuefang Mei
Infectious Agents and Cancer.2023;[Epub] CrossRef
Inflammatory response to Trichomonas vaginalis in the pathogenesis of prostatitis and benign prostatic hyperplasia
Ik-Hwan Han, Jung-Hyun Kim, Jae-Sook Ryu
Parasites, Hosts and Diseases.2023; 61(1): 2. CrossRef
Proliferation of Mouse Prostate Cancer Cells Inflamed by Trichomonas vaginalis
Sang-Su Kim, Kyu-Shik Kim, Ik-Hwan Han, Yeseul Kim, Seong Sik Bang, Jung-Hyun Kim, Yong-Suk Kim, Soo-Yeon Choi, Jae-Sook Ryu
The Korean Journal of Parasitology.2021; 59(6): 547. CrossRef
Involvement of Macrophages in Proliferation of Prostate Cancer Cells Infected with Trichomonas vaginalis
Kyu-Shik Kim, Hong-Sang Moon, Sang-Su Kim, Jae-Sook Ryu
The Korean Journal of Parasitology.2021; 59(6): 557. CrossRef

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Transcriptomic Features of Echinococcus granulosus Protoscolex during the Encystation Process: Junjie Fan, Hongye Wu, Kai Li, Xunuo Liu, Qingqing Tan, Wenqiao Cao, Bo Liang, Bin Ye; Korean J Parasitol 2020;58(3):287-299.
Published online June 26, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.3.287

Cystic echinococcosis (CE) is a zoonotic infection caused by Echinococcus granulosus larvae. It seriously affects the development of animal husbandry and endangers human health. Due to a poor understanding of the cystic fluid formation pathway, there is currently a lack of innovative methods for the prevention and treatment of CE. In this study, the protoscoleces (PSCs) in the encystation process were analyzed by high-throughput RNA sequencing. A total of 32,401 transcripts and 14,903 cDNAs revealed numbers of new genes and transcripts, stage-specific genes, and differently expressed genes. Genes encoding proteins involved in signaling pathways, such as putative G-protein coupled receptor, tyrosine kinases, and serine/threonine protein kinase, were predominantly up-regulated during the encystation process. Antioxidant enzymes included cytochrome c oxidase, thioredoxin glutathione, and glutathione peroxidase were a high expression level. Intriguingly, KEGG enrichment suggested that differentially up-regulated genes involved in the vasopressin-regulated water reabsorption metabolic pathway may play important roles in the transport of proteins, carbohydrates, and other substances. These results provide valuable information on the mechanism of cystic fluid production during the encystation process, and provide a basis for further studies on the molecular mechanisms of growth and development of PSCs.

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First comparative proteomic and in vitro behavioral study of Echinococcus granulosus metacestodes in Felis catus
Andrea Maglioco, Vanesa V. Miana, María Pía Valacco, Facundo A. Agüero, María Laura Gertiser, Héctor G. Avila, Melisa S. Barbery Venturi, Oscar Jensen, Alejandra Y. Juárez Valdez, Elio A. Prieto González, Alicia G. Fuchs
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Genome-wide transcriptome analysis of Echinococcus multilocularis larvae and germinative cell cultures reveals genes involved in parasite stem cell function
Michaela Herz, Magdalena Zarowiecki, Leonie Wessels, Katharina Pätzel, Ruth Herrmann, Christiane Braun, Nancy Holroyd, Thomas Huckvale, Monika Bergmann, Markus Spiliotis, Uriel Koziol, Matthew Berriman, Klaus Brehm
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Elham Hassanzadeh, Shahram Khademvatan, Behzad Jafari, Abbas Jafari, Elham Yousefi, Sheikh Arslan Sehgal
PLOS ONE.2023; 18(10): e0290947. CrossRef
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José de Jesús Martínez-González, Alberto Guevara-Flores, Irene Patricia del Arenal Mena
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Bioinformatics analysis and experimental verification of Notch signalling pathway-related miRNA–mRNA subnetwork in extracellular vesicles during Echinococcus granulosus encystation
Jian Gao, Xuan Zhou, Ling Liu, Guodong Lv, Qiulian Hou, Xiaofan Zhang, Yujuan Shen
Parasites & Vectors.2022;[Epub] CrossRef
iTRAQ-based comparative proteomic analysis in different developmental stages ofEchinococcus granulosus
Xin Li, Song Jiang, Xuhai Wang, Wenqiao Hui, Bin Jia
Parasite.2021; 28: 15. CrossRef
Genome-wide transcriptome analysis of the early developmental stages of Echinococcus granulosus protoscoleces reveals extensive alternative splicing events in the spliceosome pathway
Mohammad Ali Mohammadi, Majid Fasihi Harandi, Donald P. McManus, Mehdi Mansouri
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Synergism therapeutic and immunoregulatory effects of Albendazole + rAd-mIL-28B against Echinococcosis in experiment-infected mice with protoscoleces
Yan Zhang, Jianghua Wang, Qingxia Yang, Zhi Li, Xiaoying Xu, Chong Chen, Zongjie Hou, Qi He, Li Sheng, Xingming Ma, Yanping Luo, Alessandra Morassutti
PLOS Neglected Tropical Diseases.2021; 15(11): e0009927. CrossRef

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Polarization of M2 Macrophages by Interaction between Prostate Cancer Cells Treated with Trichomonas vaginalis and Adipocytes: Hyo-Yeoung Chung, Jung-Hyun Kim, Ik-Hwan Han, Jae-Sook Ryu; Korean J Parasitol 2020;58(3):217-227.
Published online June 26, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.3.217

Abstract
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Trichomonas vaginalis causes inflammation of the prostate and has been detected in tissues of prostate cancers (PCa), prostatitis and benign prostatic hyperplasia. Obesity is a risk factor for PCa and causes a chronic subclinical inflammation. This chronic inflammation further exacerbates adipose tissue inflammation as results of migration and activation of macrophages. Macrophages are the most abundant immune cells in the PCa microenvironment. M2 macrophages, known as Tumor-Associated Macrophages, are involved in increasing cancer malignancy. In this study, conditioned medium (TCM) of PCa cells infected with live trichomonads contained chemokines that stimulated migration of the mouse preadipocytes (3T3-L1 cells). Conditioned medium of adipocytes incubated with TCM (ATCM) contained Th2 cytokines (IL-4, IL-13). Macrophage migration was stimulated by ATCM. In macrophages treated with ATCM, expression of M2 markers increased, while M1 markers decreased. Therefore, it is suggested that ATCM induces polarization of M0 to M2 macrophages. In addition, conditioned medium from the macrophages incubated with ATCM stimulates the proliferation and invasiveness of PCa. Our findings suggest that interaction between inflamed PCa treated with T. vaginalis and adipocytes causes M2 macrophage polarization, so contributing to the progression of PCa.

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Interplay of obesity and parasitic infection: current evidence of immunogenesis, tumorigenesis and leptin receptor involvement
Enas El Saftawy, Mansour Alghamdi, Basma Emad Aboulhoda
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Alhomam Dabaliz, Mohammad Nawar Al Hakawati, Najmuddeen Alrashdan, Sarah Alrashdan, Mohamad Bakir, Khalid S. Mohammad
International Journal of Molecular Sciences.2025; 26(19): 9781. CrossRef
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Stem Cells International.2023; 2023: 1. CrossRef
The correlation between Trichomonas vaginalis infection and reproductive system cancer: a systematic review and meta-analysis
Zhenchao Zhang, Dongxian Li, Yuhua Li, Rui Zhang, Xianghuan Xie, Yi Yao, Linfei Zhao, Xiaowei Tian, Zhenke Yang, Shuai Wang, Xuejing Yue, Xuefang Mei
Infectious Agents and Cancer.2023;[Epub] CrossRef
The Roles of Tumor-Associated Macrophages in Prostate Cancer
Chenglin Han, Yuxuan Deng, Wenchao Xu, Zhuo Liu, Tao Wang, Shaogang Wang, Jihong Liu, Xiaming Liu, Eshan Khan
Journal of Oncology.2022; 2022: 1. CrossRef
Sevoflurane activates the IL-6/HO-1 pathway to promote macrophage M2 polarization and prostate cancer lung metastasis
Fang Yu, Tao Bai
International Immunopharmacology.2022; 113: 109380. CrossRef
Signaling Role of Adipocyte Leptin in Prostate Cell Proliferation Induced by Trichomonas vaginalis
Jung-Hyun Kim, Ik-Hwan Han, Su-Jin Shin, Sung-Yul Park, Hyo-Yeoung Chung, Jae-Sook Ryu
The Korean Journal of Parasitology.2021; 59(3): 235. CrossRef
Proliferation of Mouse Prostate Cancer Cells Inflamed by Trichomonas vaginalis
Sang-Su Kim, Kyu-Shik Kim, Ik-Hwan Han, Yeseul Kim, Seong Sik Bang, Jung-Hyun Kim, Yong-Suk Kim, Soo-Yeon Choi, Jae-Sook Ryu
The Korean Journal of Parasitology.2021; 59(6): 547. CrossRef
Involvement of Macrophages in Proliferation of Prostate Cancer Cells Infected with Trichomonas vaginalis
Kyu-Shik Kim, Hong-Sang Moon, Sang-Su Kim, Jae-Sook Ryu
The Korean Journal of Parasitology.2021; 59(6): 557. CrossRef
Is Trichomonas vaginalis a Risk Factor for Prostate Cancer? A Systematic Review and Meta-analysis
Gianpaolo Perletti, Vittorio Magri, Louise Beckers-Perletti, Alberto Trinchieri, Konstantinos Stamatiou
Hellenic Urology.2021; 33(1): 12. CrossRef

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Brief Communication

Comparison of Seropositivity to Trichomonas vaginalis between Men with Prostatic Tumor and Normal Men: Jung-Hyun Kim, Hong-Sang Moon, Kyu-Shik Kim, Hwan-Sik Hwang, Jae-Sook Ryu, Sung-Yul Park; Korean J Parasitol 2019;57(1):21-25.
Published online February 26, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.1.21

Abstract
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Trichomoniasis is the most common curable sexually-transmitted infection. Most Trichomonas vaginalis-infected men are asymptomatic and can remain undiagnosed and untreated, and this has been thought to result in chronic persistent prostatic infection. Chronic inflammation is regarded as the major factor in the pathogenesis and progression of benign prostatic hyperplasia (BPH) and prostatic cancer (PCa). The aim of this study is to identify seropositivity to T. vaginalis in men with prostate tumors (BPH or PCa) visited to Hanyang University Hospital. A total of 183 men were enrolled between October 2013 and November 2014. They consisted of 139 with BPH (mean age: 64.0 ± 0.07) and 44 with prostate cancer (mean age: 73.3±0.18). We carried out ELISA to identify the seropositivity to T. vaginalis. Mixed lysate antigen extracted from 8 strains of T. vaginalis was used in the ELISA. Also 58 male outpatients visited to Health Promotion Center in Hanyang University Hospital were evaluated for comparing group. As a results, seropositivity to T. vaginalis in patients with prostatic diseases was 19.7% (BPH: 18.7%, PCa: 22.7%) and it was significantly higher than the 1.7% of the comparing healthy group (P = 0.001). Therefore, prostatic tumor showed higher seropositivity against T. vaginalis than normal men. As far as we know, this is the first report about seroprevalence in prostatic tumor in Korea.

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Alexandra Ibáñez-Escribano, Juan José Nogal-Ruiz
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No Association of Trichomonas vaginalis Seropositivity with Advanced Prostate Cancer Risk in the Multiethnic Cohort: A Nested Case-Control Study
Michelle Nagata, Anne Tome, Kami White, Lynne R. Wilkens, Song-Yi Park, Loïc Le Marchand, Christopher Haiman, Brenda Y. Hernandez
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James S. Lawson, Wendy K. Glenn
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Nora E. Saleh, Samar M. Alhusseiny, Wafaa M. El-Zayady, Engy M. Aboelnaga, Wafaa N. El-beshbishi, Yasser M. Saleh, Hala S. Abou-ElWafa, Samar N. El-Beshbishi
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Karolina Garbas, Piotr Zapała, Łukasz Zapała, Piotr Radziszewski
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Involvement of Macrophages in Proliferation of Prostate Cancer Cells Infected with Trichomonas vaginalis
Kyu-Shik Kim, Hong-Sang Moon, Sang-Su Kim, Jae-Sook Ryu
The Korean Journal of Parasitology.2021; 59(6): 557. CrossRef
Seroprevalence and risk factors of Trichomonas vaginalis among couples in Al-Hamza city-Iraq.
Musafer H. Al-Ardi
Al-Kufa University Journal for Biology.2021; 13(1): 26. CrossRef
Is Trichomonas vaginalis a Risk Factor for Prostate Cancer? A Systematic Review and Meta-analysis
Gianpaolo Perletti, Vittorio Magri, Louise Beckers-Perletti, Alberto Trinchieri, Konstantinos Stamatiou
Hellenic Urology.2021; 33(1): 12. CrossRef
IL-6 produced by prostate epithelial cells stimulated with Trichomonas vaginalis promotes proliferation of prostate cancer cells by inducing M2 polarization of THP-1-derived macrophages
Ik-Hwan Han, Hyun-Ouk Song, Jae-Sook Ryu, Michael H. Hsieh
PLOS Neglected Tropical Diseases.2020; 14(3): e0008126. CrossRef
Development of a convenient detection method for Trichomonas vaginalis based on loop-mediated isothermal amplification targeting adhesion protein 65
Yuhua Li, Shuai Wang, Haoran Li, Xiaoxiao Song, Hao Zhang, Yujuan Duan, Chengyang Luo, Bingli Wang, Sifan Ji, Qing Xie, Zhenchao Zhang
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Original Articles

Atorvastatin: In-Vivo Synergy with Metronidazole as Anti-Blastocystis Therapy: Maha M. A. Basyoni, Shawky A. Fouad, Marwa F. Amer, Ahmed Fathy Amer, Dalia Ibrahim Ismail; Korean J Parasitol 2018;56(2):105-112.
Published online April 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.2.105

Abstract
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Blastocystis is an enteric Straminopile in tropical, subtropical and developing countries. Metronidazole has been a chemotheraputic for blastocystosis. Failures in its regimens were reported and necessitate new studies searching for alternative therapeutic agents. Aim of current study is to investigate potential effects of Atorvastatin (AVA) compared to the conventional chemotherapeutic MTZ in experimentally Blastocystis-infected mice. Anti-Blastocystis efficacy of AVA was evaluated parasitologically, histopathologically and by transmission electron microscopy using MTZ (10 mg/kg) as a control. Therapeutic efficacy of AVA was apparently dose-dependent. Regimens of AVA (20 and 40 mg/kg) proved effective against Blastocystis infections with high reduction in Blastocystis shedding (93.4-97.9%) compared to MTZ (79.3%). The highest reductions (98.1% and 99.4%) were recorded in groups of combination treatments AVA 20-40 mg/kg and MTZ 10 mg/kg. Blastocystis was nearly eradicated by the 20th day post infection. Genotype analysis revealed that genotype I was most susceptible, genotype III was less. Histopathologic and ultrastructural studies revealed apoptotic changes in Blastocystis and significant improvement of intestinal histopathological changes more remarkable in combinational therapy groups. Thus, the present study offers AVA as a potential candidate for Blastocystis therapy combined with MTZ.

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Efficient Liquid Media for Encystation of Pathogenic Free-Living Amoebae: Hae-Jin Sohn, Heekyoung Kang, Ga-Eun Seo, Jong-Hyun Kim, Suk-Yul Jung, Ho-Joon Shin; Korean J Parasitol 2017;55(3):233-238.
Published online June 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.3.233

Abstract
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Pathogenic Naegleria fowleri, Acanthamoeba castellanii, and Acanthamoeba polyphaga, are distributed worldwide. They are causative agents of primary amoebic meningoencephalitis or acanthamoebic keratitis in humans, respectively. Trophozoites encyst in unfavorable environments, such as exhausted food supply and desiccation. Until recently, the method of N. fowleri encystation used solid non-nutrient agar medium supplemented with heat-inactivated Escherichia coli; however, for the amoebic encystment of Acanthamoeba spp., a defined, slightly modified liquid media is used. In this study, in order to generate pure N. fowleri cysts, a liquid encystment medium (buffer 1) modified from Page’s amoeba saline was applied for encystation of N. fowleri. N. fowleri cysts were well induced after 24 hr with the above defined liquid encystment medium (buffer 1). This was confirmed by observation of a high expression of differential mRNA of nfa1 and actin genes in trophozoites. Thus, this liquid medium can replace the earlier non-nutrient agar medium for obtaining pure N. fowleri cysts. In addition, for cyst formation of Acanthamoeba spp., buffer 2 (adjusted to pH 9.0) was the more efficient medium. To summarize, these liquid encystment media may be useful for further studies which require axenic and pure amoebic cysts.

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DNA Methylation of Gene Expression in Acanthamoeba castellanii Encystation: Eun-Kyung Moon, Yeonchul Hong, Hae-Ahm Lee, Fu-Shi Quan, Hyun-Hee Kong; Korean J Parasitol 2017;55(2):115-120.
Published online April 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.2.115

Abstract
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Encystation mediating cyst specific cysteine proteinase (CSCP) of Acanthamoeba castellanii is expressed remarkably during encystation. However, the molecular mechanism involved in the regulation of CSCP gene expression remains unclear. In this study, we focused on epigenetic regulation of gene expression during encystation of Acanthamoeba. To evaluate methylation as a potential mechanism involved in the regulation of CSCP expression, we first investigated the correlation between promoter methylation status of CSCP gene and its expression. A 2,878 bp of promoter sequence of CSCP gene was amplified by PCR. Three CpG islands (island 1-3) were detected in this sequence using bioinformatics tools. Methylation of CpG island in trophozoites and cysts was measured by bisulfite sequence PCR. CSCP promoter methylation of CpG island 1 (1,633 bp) was found in 8.2% of trophozoites and 7.3% of cysts. Methylation of CpG island 2 (625 bp) was observed in 4.2% of trophozoites and 5.8% of cysts. Methylation of CpG island 3 (367 bp) in trophozoites and cysts was both 3.6%. These results suggest that DNA methylation system is present in CSCP gene expression of Acanthamoeba. In addition, the expression of encystation mediating CSCP is correlated with promoter CpG island 1 hypomethylation.

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The Korean Journal of Parasitology.2019; 57(3): 217. CrossRef

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Identification and Characterization of Protein Arginine Methyltransferase 1 in Acanthamoeba castellanii: Eun-Kyung Moon, Hyun-Hee Kong, Yeonchul Hong, Hae-Ahm Lee, Fu-Shi Quan; Korean J Parasitol 2017;55(2):109-114.
Published online April 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.2.109

Abstract
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Protein arginine methyltransferase (PRMT) is an important epigenetic regulator in eukaryotic cells. During encystation, an essential process for Acanthamoeba survival, the expression of a lot of genes involved in the encystation process has to be regulated in order to be induced or inhibited. However, the regulation mechanism of these genes is yet unknown. In this study, the full-length 1,059 bp cDNA sequence of Acanthamoeba castellanii PRMT1 (AcPRMT1) was cloned for the first time. The AcPRMT1 protein comprised of 352 amino acids with a SAM-dependent methyltransferase PRMT-type domain. The expression level of AcPRMT1 was highly increased during encystation of A. castellanii. The EGFPAcPRMT1 fusion protein was distributed over the cytoplasm, but it was mainly localized in the nucleus of Acanthamoeba. Knock down of AcPRMT1 by synthetic siRNA with a complementary sequence failed to form mature cysts. These findings suggested that AcPRMT1 plays a critical role in the regulation of encystation of A. castellanii. The target gene of AcPRMT1 regulation and the detailed mechanisms need to be investigated by further studies.

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FEMS Microbiology Reviews.2019; 43(4): 415. CrossRef

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Traditional Living Habits of the Taz Tundra Population: A Paleoparasitological Study: Sergey Mikhailovich Slepchenko, Sergey Nikolaevich Ivanov, Bagashev Anatoly Nikolaevich, Tsybankov Alexander Alekseevich, Slavinsky Vyacheslav Sergeyevich; Korean J Parasitol 2016;54(5):617-623.
Published online October 31, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.5.617

Abstract
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An excavation of the Vesakoyakha II-IV and Nyamboyto I burial grounds was conducted during the 2014 field season, and soil samples from intact burials dating from the 19th and 20th centuries, respectively, were analyzed to determine interactions between parasites and host/vectors. Considering the discovery of Diphyllobothrium sp. and Taenia sp. eggs in soil samples from the pelvic region, diphyllobothriasis was the most frequent helminthic infection among the Taz Nenets. The Nyamboyto Nenets mainly consumed uncooked fish, while the Vesakoyakha Nenets had a bigger variety in food choices, including reindeer meat. Nenets children were given raw fish from early childhood. The paleoparasitological results corroborate rare ethnographic records about the consumption of uncooked reindeer cerebrum which led to beef tapeworm helminthiases. This is the first parasitological report of helminthic diseases among the Taz Nenets, and, as such, it provides insight into their subsistence activities and food patterns and broadens our understanding of their health condition.

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Pygidiopsis summa (Digenea: Heterophyidae): Status of Metacercarial Infection in Mullets from Coastal Areas in the Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Won-Ja Lee, Mi-Yeoun Park, Soon-Won Lee, Seung-Bong Choi, Beom-Nyung Huh, Won-Seok Seok; Korean J Parasitol 2016;54(4):497-502.
Published online August 31, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.4.497

Abstract
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To know the infection status of zoonotic trematode metacercariae in brackish water fish, we surveyed mullets collected from 18 coastal areas in the Republic of Korea. The metacercariae of Pygidiopsis summa were detected in 236 (68.2%) out of 346 mullets examined. They were found in mullets from 15 areas except for those from Boseong-gun (Jeollanam-do), Pohang-si, and Uljin-gun (Gyeongsangbuk-do). Especially in mullets from Taean-gun (Chungcheongnam-do) and Geoje-si (Gyeongsangnam-do), their prevalences were 100% and 95.5%, and the average metacercarial density was more than 1,000 per fish. They were also detected in mullets from 3 coastal lakes, Gyeongpoho, Songjiho, and Hwajinpoho, in Gangwon-do, and their average densities were 419, 147, and 672 per infected fish, respectively. The metacercariae of 5 other heterophyid species, including Heterophyes nocens, Heterophyopsis continua, Metagonimus sp., Stictodora fuscata, and Stictodora lari, were found in the mullets examined. The metacercariae of H. nocens were detected in 66.7, 100, 28.6, 81.6, 3.9, 61.5, and 27.3% of mullets from Muan-gun, Shinan-gun, Haenam-gun, Gangjin-gun, and Boseong-gun (Jeollanam-do), Hadong-gun, and Geoje-si (Gyeongsangnam-do), and their metacercarial intensities were 64, 84, 119, 99, 1, 24, and 24 per fish infected, respectively. From the above results, it has been confirmed that P. summa metacercariae are heavily infected in mullets from coastal areas of Korea. It is suggested that residents who frequently consume raw mullet dish can be easily infected with heterophyid flukes.

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Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Soon-Won Lee
The Korean Journal of Parasitology.2019; 57(6): 681. CrossRef
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The Korean Journal of Parasitology.2018; 56(3): 259. CrossRef
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Identification of Protein Arginine Methyltransferase 5 as a Regulator for Encystation of Acanthamoeba: Eun-Kyung Moon, Yeonchul Hong, Dong-Il Chung, Youn-Kyoung Goo, Hyun-Hee Kong; Korean J Parasitol 2016;54(2):133-138.
Published online April 30, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.2.133

Abstract
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Encystation is an essential process for Acanthamoeba survival under nutrient-limiting conditions and exposure to drugs. The expression of several genes has been observed to increase or decrease during encystation. Epigenetic processes involved in regulation of gene expression have been shown to play a role in several pathogenic parasites. In the present study, we identified the protein arginine methyltransferase 5 (PRMT5), a known epigenetic regulator, in Acanthamoeba castellanii. PRMT5 of A. castellanii (AcPRMT5) contained domains found in S-adenosylmethionine-dependent methyltransferases and in PRMT5 arginine-N-methyltransferase. Expression levels of AcPRMT5 were increased during encystation of A. castellanii. The EGFP-PRMT5 fusion protein was mainly localized in the nucleus of trophozoites. A. castellanii transfected with siRNA designed against AcPRMT5 failed to form mature cysts. The findings of this study lead to a better understanding of epigenetic mechanisms behind the regulation of encystation in cyst-forming pathogenic protozoa.

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Encystment and Excystment Processes in Acanthamoeba castellanii: An Emphasis on Cellulose Involvement
Mathew Choaji, Ascel Samba-Louaka, Zineb Fechtali-Moute, Willy Aucher, Sébastien Pomel
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Oxidase enzyme genes are differentially expressed during Acanthamoeba castellanii encystment
Christian Q. Scheckhuber, Rebeca Damián Ferrara, Jesús Gómez-Montalvo, Sutherland K. Maciver, Alvaro de Obeso Fernández del Valle
Parasitology Research.2024;[Epub] CrossRef
Acanthamoeba keratitis: new hopes for potential interventions for a curable but often refractory disease
Bader Saleem Alawfi, Naveed Ahmed Khan, David Lloyd, Ruqaiyyah Siddiqui
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Biological characteristics and pathogenicity of Acanthamoeba
Yuehua Wang, Linzhe Jiang, Yitong Zhao, Xiaohong Ju, Le Wang, Liang Jin, Ryan D. Fine, Mingguang Li
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Comparative analysis of differentially expressed genes in Acanthamoeba after ingestion of Legionella pneumophila and Escherichia coli
Eun-Kyung Moon, Min-Jeong Kim, Hae-Ahm Lee, Fu-Shi Quan, Hyun-Hee Kong
Experimental Parasitology.2022; 232: 108188. CrossRef
Stimulation of Acanthamoeba castellanii excystment by enzyme treatment and consequences on trophozoite growth
Zineb Fechtali-Moute, Philippe M. Loiseau, Sébastien Pomel
Frontiers in Cell and Developmental Biology.2022;[Epub] CrossRef
Free-living amoebae and squatters in the wild: ecological and molecular features
Ascel Samba-Louaka, Vincent Delafont, Marie-Hélène Rodier, Estelle Cateau, Yann Héchard
FEMS Microbiology Reviews.2019; 43(4): 415. CrossRef
Encystation: the most prevalent and underinvestigated differentiation pathway of eukaryotes
Pauline Schaap, Christina Schilde
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Identification and Characterization of Protein Arginine Methyltransferase 1 in Acanthamoeba castellanii
Eun-Kyung Moon, Hyun-Hee Kong, Yeonchul Hong, Hae-Ahm Lee, Fu-Shi Quan
The Korean Journal of Parasitology.2017; 55(2): 109. CrossRef
DNA Methylation of Gene Expression in Acanthamoeba castellanii Encystation
Eun-Kyung Moon, Yeonchul Hong, Hae-Ahm Lee, Fu-Shi Quan, Hyun-Hee Kong
The Korean Journal of Parasitology.2017; 55(2): 115. CrossRef

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Inflammatory Responses in a Benign Prostatic Hyperplasia Epithelial Cell Line (BPH-1) Infected with Trichomonas vaginalis: Sang-Su Kim, Jung-Hyun Kim, Ik-Hwan Han, Myoung-Hee Ahn, Jae-Sook Ryu; Korean J Parasitol 2016;54(2):123-132.
Published online April 30, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.2.123

Abstract
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Trichomonas vaginalis causes the most prevalent sexually transmitted infection worldwide. Trichomonads have been detected in prostatic tissues from prostatitis, benign prostatic hyperplasia (BPH), and prostate cancer. Chronic prostatic inflammation is known as a risk factor for prostate enlargement, benign prostatic hyperplasia symptoms, and acute urinary retention. Our aim was to investigate whether T. vaginalis could induce inflammatory responses in cells of a benign prostatic hyperplasia epithelial cell line (BPH-1). When BPH-1 cells were infected with T. vaginalis, the protein and mRNA of inflammatory cytokines, such as CXCL8, CCL2, IL-1β, and IL-6, were increased. The activities of TLR4, ROS, MAPK, JAK2/STAT3, and NF-κB were also increased, whereas inhibitors of ROS, MAPK, PI3K, NF-κB, and anti-TLR4 antibody decreased the production of the 4 cytokines although the extent of inhibition differed. However, a JAK2 inhibitor inhibited only IL-6 production. Culture supernatants of the BPH-1 cells that had been incubated with live T. vaginalis (trichomonad-conditioned medium, TCM) contained the 4 cytokines and induced the migration of human monocytes (THP-1 cells) and mast cells (HMC-1 cells). TCM conditioned by BPH-1 cells pretreated with NF-κB inhibitor showed decreased levels of cytokines and induced less migration. Therefore, it is suggested that these cytokines are involved in migration of inflammatory cells. These results suggest that T. vaginalis infection of BPH patients may cause inflammation, which may induce lower urinary tract symptoms (LUTS).

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Brooke Webb, Andrea Crampton, Michelle J. Francis, John Hamblin, Tony M. Korman, Maryza Graham
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Ik‐Hwan Han, Jung‐Hyun Kim, Ki‐Seok Jang, Jae‐Sook Ryu
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Pei-Ju Sung, Nicolas Rama, Jeromine Imbach, Stephany Fiore, Benjamin Ducarouge, David Neves, Huei-Wen Chen, David Bernard, Pan-Chyr Yang, Agnès Bernet, Stephane Depil, Patrick Mehlen
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Proliferation of prostate epithelia induced by IL‐6 from stroma reacted with Trichomonas vaginalis
J.‐H. Kim, I.‐H. Han, Y.‐S. Kim, C.‐S. Noh, J.‐S. Ryu
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Proliferation of Prostate Stromal Cell Induced by Benign Prostatic Hyperplasia Epithelial Cell Stimulated WithTrichomonas vaginalisvia Crosstalk With Mast Cell
Jung-Hyun Kim, Sang-Su Kim, Ik-Hwan Han, Seobo Sim, Myoung-Hee Ahn, Jae-Sook Ryu
The Prostate.2016; 76(15): 1431. CrossRef
Signalling pathways associated with IL‐6 production and epithelial–mesenchymal transition induction in prostate epithelial cells stimulated with Trichomonas vaginalis
I. H. Han, J. H. Kim, S. S. Kim, M. H. Ahn, J. S. Ryu
Parasite Immunology.2016; 38(11): 678. CrossRef

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Afatinib Reduces STAT6 Signaling of Host ARPE-19 Cells Infected with Toxoplasma gondii: Zhaoshou Yang, Hye-Jin Ahn, Young-Hoon Park, Ho-Woo Nam; Korean J Parasitol 2016;54(1):31-38.
Published online February 26, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.1.31

Abstract
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Specific gene expressions of host cells by spontaneous STAT6 phosphorylation are major strategy for the survival of intracellular Toxoplasma gondii against parasiticidal events through STAT1 phosphorylation by infection provoked IFN-γ. We determined the effects of small molecules of tyrosine kinase inhibitors (TKIs) on the growth of T. gondii and on the relationship with STAT1 and STAT6 phosphorylation in ARPE-19 cells. We counted the number of T. gondii RH tachyzoites per parasitophorous vacuolar membrane (PVM) after treatment with TKIs at 12-hr intervals for 72 hr. The change of STAT6 phosphorylation was assessed via western blot and immunofluorescence assay. Among the tested TKIs, Afatinib (pan ErbB/EGFR inhibitor, 5 ?M) inhibited 98.0% of the growth of T. gondii, which was comparable to pyrimethamine (5 ?M) at 96.9% and followed by Erlotinib (ErbB1/EGFR inhibitor, 20 ?M) at 33.8% and Sunitinib (PDGFR or c-Kit inhibitor, 10 ?M) at 21.3%. In the early stage of the infection (2, 4, and 8 hr after T. gondii challenge), Afatinib inhibited the phosphorylation of STAT6 in western blot and immunofluorescence assay. Both JAK1 and JAK3, the upper hierarchical kinases of cytokine signaling, were strongly phosphorylated at 2 hr and then disappeared entirely after 4 hr. Some TKIs, especially the EGFR inhibitors, might play an important role in the inhibition of intracellular replication of T. gondii through the inhibition of the direct phosphorylation of STAT6 by T. gondii.

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Small molecule kinase inhibitor altiratinib inhibits brain cyst forming bradyzoites of Toxoplasma gondii
Yeong Hoon Kim, Hye-Jin Ahn, Hwa Sun Kim, Ho-Woo Nam
Journal of Microbiology.2025; 63(2): e2409001. CrossRef
iTRAQ-Based Phosphoproteomic Analysis Exposes Molecular Changes in the Small Intestinal Epithelia of Cats after Toxoplasma gondii Infection
Bintao Zhai, Yu-Meng Meng, Shi-Chen Xie, Jun-Jie Peng, Yang Liu, Yanhua Qiu, Lu Wang, Jiyu Zhang, Jun-Jun He
Animals.2023; 13(22): 3537. CrossRef
Secretome Analysis of Host Cells Infected with Toxoplasma gondii after Treatment of Human Epidermal Growth Factor Receptor 2/4 Inhibitors
Hye-Jung Kim, Hye-Jin Ahn, Hyeweon Kang, Jaehui Park, Seul gi Oh, Saehae Choi, Won-Kyu Lee, Ho-Woo Nam
The Korean Journal of Parasitology.2020; 58(3): 249. CrossRef
A Human Proteome Array Approach to Identifying Key Host Proteins Targeted by Toxoplasma Kinase ROP18
Zhaoshou Yang, Yongheng Hou, Taofang Hao, Hee-Sool Rho, Jun Wan, Yizhao Luan, Xin Gao, Jianping Yao, Aihua Pan, Zhi Xie, Jiang Qian, Wanqin Liao, Heng Zhu, Xingwang Zhou
Molecular & Cellular Proteomics.2017; 16(3): 469. CrossRef
Adverse Event Profile of Pyrimethamine-Based Therapy in Toxoplasmosis: A Systematic Review
Ruben R. Ben-Harari, Elizabeth Goodwin, Julio Casoy
Drugs in R&D.2017; 17(4): 523. CrossRef
Suppressors for Human Epidermal Growth Factor Receptor 2/4 (HER2/4): A New Family of Anti-Toxoplasmic Agents in ARPE-19 Cells
Yeong Hoon Kim, Lokraj Bhatt, Hye-Jin Ahn, Zhaoshou Yang, Won-Kyu Lee, Ho-Woo Nam
The Korean Journal of Parasitology.2017; 55(5): 491. CrossRef

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Articles from Symposium on Control of NTDs around Lake Victoria, Tanzania

Improved Socio-Economic Status of a Community Population Following Schistosomiasis and Intestinal Worm Control Interventions on Kome Island, North-Western Tanzania: Joseph R. Mwanga, Godfrey M. Kaatano, Julius E. Siza, Su Young Chang, Yunsuk Ko, Cyril M. Kullaya, Jackson Nsabo, Keeseon S. Eom, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, John M. Changalucha; Korean J Parasitol 2015;53(5):553-559.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.553

Abstract
PDF

Research on micro-level assessment of the changes of socio-economic status following health interventions is very scarce. The use of household asset data to determine wealth indices is a common procedure for estimating socio-economic position in resource poor settings. In such settings information about income is usually lacking, and the collection of individual consumption or expenditure data would require in-depth interviews, posing a considerable risk of bias. In this study, we determined the socio-economic status of 213 households in a community population in an island in the north-western Tanzania before and 3 year after implementation of a participatory hygiene and sanitation transformation (PHAST) intervention to control schistosomiasis and intestinal worm infections. We constructed a household 'wealth index' based housing construction features (e.g., type of roof, walls, and floor) and durable assets ownership (e.g., bicycle, radio, etc.). We employed principal components analysis and classified households into wealth quintiles. The study revealed that asset variables with positive factor scores were associated with higher socio-economic status, whereas asset variables with negative factor scores were associated with lower socio-economic status. Overall, households which were rated as the poorest and very poor were on the decrease, whereas those rated as poor, less poor, and the least poor were on the increase after PHAST intervention. This decrease/increase was significant. The median shifted from -0.4376677 to 0.5001073, and the mean from -0.2605787 (SD; 2.005688) to 0.2605787 (SD; 1.831199). The difference in socio-economic status of the people between the 2 phases was highly statistically significant (P<0.001). We argue that finding of this study should be treated with caution as there were other interventions to control schistosomiasis and intestinal worm infections which were running concurrently on Kome Island apart from PHAST intervention.

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Estimation of household level variation in per capita calorie intake by measures of economic well‐being of the household in India
Junaid Khan, Sanjay K. Mohanty
Tropical Medicine & International Health.2025; 30(6): 481. CrossRef
The use of non-pharmaceutical interventions for the prevention and control of schistosomiasis in sub-Saharan Africa: A systematic review
Buba Manjang, Elizabeth A. Ochola, Susan J. Elliott
Global Public Health.2022; 17(3): 469. CrossRef
Socioeconomic determinants of Schistosoma mansoni infection using multiple correspondence analysis among rural western Kenyan communities: Evidence from a household-based study
Isaiah Omondi, Maurice R. Odiere, Fredrick Rawago, Pauline N. Mwinzi, Carl Campbell, Rosemary Musuva, Mary Hamer Hodges
PLOS ONE.2021; 16(6): e0253041. CrossRef

10,850 View
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Original Articles

Degradation of the Transcription Factors NF-κB, STAT3, and STAT5 Is Involved in Entamoeba histolytica-Induced Cell Death in Caco-2 Colonic Epithelial Cells: Kyeong Ah Kim, Arim Min, Young Ah Lee, Myeong Heon Shin; Korean J Parasitol 2014;52(5):459-469.
Published online October 22, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.5.459

Abstract
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Entamoeba histolytica is a tissue-invasive protozoan parasite causing dysentery in humans. During infection of colonic tissues, amoebic trophozoites are able to kill host cells via apoptosis or necrosis, both of which trigger IL-8-mediated acute inflammatory responses. However, the signaling pathways involved in host cell death induced by E. histolytica have not yet been fully defined. In this study, we examined whether calpain plays a role in the cleavage of pro-survival transcription factors during cell death of colonic epithelial cells, induced by live E. histolytica trophozoites. Incubation with amoebic trophozoites induced activation of m-calpain in a time- and dose-dependent manner. Moreover, incubation with amoebae resulted in marked degradation of STAT proteins (STAT3 and STAT5) and NF-κB (p65) in Caco-2 cells. However, IκB, an inhibitor of NF-κB, was not cleaved in Caco-2 cells following adherence of E. histolytica. Entamoeba-induced cleavage of STAT proteins and NF-κB was partially inhibited by pretreatment of cells with a cell-permeable calpain inhibitor, calpeptin. In contrast, E. histolytica did not induce cleavage of caspase-3 in Caco-2 cells. Furthermore, pretreatment of Caco-2 cells with a calpain inhibitor, calpeptin (but not the pan-caspase inhibitor, z-VAD-fmk) or m-calpain siRNA partially reduced Entamoeba-induced DNA fragmentation in Caco-2 cells. These results suggest that calpain plays an important role in E. histolytica-induced degradation of NF-κB and STATs in colonic epithelial cells, which ultimately accelerates cell death.

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Yong Du, Shaoqiu Jiang, Lujia Feng, Jing Lu, Hui Peng, Xiyuan Zhou
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Attinder Chadha, Kris Chadee
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Entamoeba histolytica activation of caspase-1 degrades cullin that attenuates NF-κB dependent signaling from macrophages
Attinder Chadha, France Moreau, Shanshan Wang, Antoine Dufour, Kris Chadee, Dario S. Zamboni
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Entamoeba histolytica Up-Regulates MicroRNA-643 to Promote Apoptosis by Targeting XIAP in Human Epithelial Colon Cells
Itzel López-Rosas, César López-Camarillo, Yarely M. Salinas-Vera, Olga N. Hernández-de la Cruz, Carlos Palma-Flores, Bibiana Chávez-Munguía, Osbaldo Resendis-Antonio, Nancy Guillen, Carlos Pérez-Plasencia, María Elizbeth Álvarez-Sánchez, Esther Ramírez-Mo
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Gene Profile Expression Related to Type I Interferons in HT-29 Cells Exposed to Cryptosporidium parvum
Seyede Manizhe Heidarnejadi, Abdollah Rafiei, Manoochehr Makvandi, Majid Pirestani, Jasem Saki, Ataallah Ghadiri
Jundishapur Journal of Microbiology.2018;[Epub] CrossRef
O-deGlcNAcylation is required for Entamoeba histolytica-induced HepG2 cell death
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Microbial Pathogenesis.2018; 123: 285. CrossRef
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Bruno M. Di Genova, Renata R. Tonelli
Frontiers in Microbiology.2016;[Epub] CrossRef

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Down-Regulation of Cellulose Synthase Inhibits the Formation of Endocysts in Acanthamoeba: Eun-Kyung Moon, Yeonchul Hong, Dong-Il Chung, Youn-Kyoung Goo, Hyun-Hee Kong; Korean J Parasitol 2014;52(2):131-135.
Published online April 18, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.2.131

Abstract
PDF

Acanthamoeba cysts are resistant to unfavorable physiological conditions and various disinfectants. Acanthamoeba cysts have 2 walls containing various sugar moieties, and in particular, one third of the inner wall is composed of cellulose. In this study, it has been shown that down-regulation of cellulose synthase by small interfering RNA (siRNA) significantly inhibits the formation of mature Acanthamoeba castellanii cysts. Calcofluor white staining and transmission electron microscopy revealed that siRNA transfected amoeba failed to form an inner wall during encystation and thus are likely to be more vulnerable. In addition, the expression of xylose isomerase, which is involved in cyst wall formation, was not altered in cellulose synthase down-regulated amoeba, indicating that cellulose synthase is a crucial factor for inner wall formation by Acanthamoeba during encystation.

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Cellulose fibrils formation and organisation of cytoskeleton during encystment are essential for Acanthamoeba cyst wall architecture
Mária Garajová, Martin Mrva, Naděžda Vaškovicová, Michal Martinka, Janka Melicherová, Andrea Valigurová
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The most abundant cyst wall proteins of Acanthamoeba castellanii are lectins that bind cellulose and localize to distinct structures in developing and mature cyst walls
Pamela Magistrado-Coxen, Yousuf Aqeel, Angelo Lopez, John R. Haserick, Breeanna R. Urbanowicz, Catherine E. Costello, John Samuelson, Photini Sinnis
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A review of Acanthamoeba keratitis in the middle East and Iran
MohammadHossein Feiz Haddad, Azar Shokri, Habib Habibpour, SeyedeManizhe Heidar Neiadi
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Encystation: the most prevalent and underinvestigated differentiation pathway of eukaryotes
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Molecular and biochemical characterization of key enzymes in the cysteine and serine metabolic pathways of Acanthamoeba castellanii
Duo Wu, Meng Feng, Zhi-xin Wang, Ke Qiao, Hiroshi Tachibana, Xun-jia Cheng
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DNA Methylation of Gene Expression in Acanthamoeba castellanii Encystation
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Case Report

Clinical Manifestations of Eosinophilic Meningitis Due to Infection with Angiostrongylus cantonensis in Children: Kittisak Sawanyawisuth, Jarin Chindaprasirt, Vichai Senthong, Panita Limpawattana, Narong Auvichayapat, Sompon Tassniyom, Verajit Chotmongkol, Wanchai Maleewong, Pewpan M. Intapan; Korean J Parasitol 2013;51(6):735-738.
Published online December 31, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.6.735

Abstract
PDF

Eosinophilic meningitis, caused by the nematode Angiostrongylus cantonensis, is prevalent in northeastern Thailand, most commonly in adults. Data regarding clinical manifestations of this condition in children is limited and may be different those in adults. A chart review was done on 19 eosinophilic meningitis patients aged less than 15 years in Srinagarind Hospital, Faculty of Medicine, Khon Kaen University, Thailand. Clinical manifestations and outcomes were reported using descriptive statistics. All patients had presented with severe headache. Most patients were males, had fever, nausea or vomiting, stiffness of the neck, and a history of snail ingestion. Six patients had papilledema or cranial nerve palsies. It was shown that the clinical manifestations of eosinophilic meningitis due to A. cantonensis in children are different from those in adult patients. Fever, nausea, vomiting, hepatomegaly, neck stiffness, and cranial nerve palsies were all more common in children than in adults.

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Neuroangiostrongyliasis: Updated Provisional Guidelines for Diagnosis and Case Definitions
Carlos Graeff-Teixeira, Kittisak Sawanyawisuth, Shan Lv, William Sears, Zhaily González Rodríguez, Hilda Hernández Álvarez, Pedro Casanova Arias, Leticia Karolini Walger Schultz, Alicia Rojas, John Jacob, Susan Jarvi, Kenton Kramer
Pathogens.2023; 12(4): 624. CrossRef
Clinical Characteristics and Treatment Outcome of Eosinophilic Meningoencephalitis in South Indian Children: Experience From a Prospective Registry
Kollencheri Puthenveettil Vinayan, Sai Chandar Dudipala, Arun Grace Roy, Vaishakh Anand
Pediatric Neurology.2023; 147: 9. CrossRef
Clinical Efficacy and Safety of Albendazole and Other Benzimidazole Anthelmintics for Rat Lungworm Disease (Neuroangiostrongyliasis): A Systematic Analysis of Clinical Reports and Animal Studies
John Jacob, Argon Steel, Zhain Lin, Fiona Berger, Katrin Zöeller, Susan Jarvi
Clinical Infectious Diseases.2022; 74(7): 1293. CrossRef
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Keisuke Abe, Chanel Casamina, Natascha Ching, Keith K Abe, Marian Melish, Karen S Thompson, Asim A Ahmed, Prashant J Purohit
Journal of the Pediatric Infectious Diseases Society.2022; 11(10): 448. CrossRef
Paratenic hosts of Angiostrongylus cantonensis and their relation to human neuroangiostrongyliasis globally
Helena C. Turck, Mark T. Fox, Robert H. Cowie
One Health.2022; 15: 100426. CrossRef
The application of metagenomic next-generation sequencing for Angiostrongylus eosinophilic meningitis in a pediatric patient: A case report
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Frontiers in Public Health.2022;[Epub] CrossRef
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Orphanet Journal of Rare Diseases.2022;[Epub] CrossRef
Gross, microscopic, radiologic, echocardiographic and haematological findings in rats experimentally infected withAngiostrongylus cantonensis
Matthew K. Wun, Sarah Davies, Derek Spielman, Rogan Lee, Doug Hayward, Richard Malik
Parasitology.2021; 148(2): 159. CrossRef
Guidelines for the diagnosis and treatment of neuroangiostrongyliasis: updated recommendations
Vernon Ansdell, Kenton J. Kramer, Jourdan K. McMillan, William L. Gosnell, Gerald S. Murphy, B C Meyer, Elizabeth U. Blalock, Johnnie Yates, Louis Lteif, Olivia A. Smith, Marian Melish
Parasitology.2021; 148(2): 227. CrossRef
Tetraventricular Hydrocephalus Following Eosinophilic Meningitis due to Angiostrongylus cantonensis in a 14-Month-Old Boy From Mayotte: A Case Report
Chiara Cattaneo, Marion Hoarau, Sophie Valois, Abdourahim Chamouine, Yacouba Dembele, Luis Collet, Raphaëlle Sarton
Open Forum Infectious Diseases.2021;[Epub] CrossRef
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Hai Thanh Phan, Kiem Hao Tran, Huu Son Nguyen
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Next-generation sequencing specifies Angiostrongylus eosinophilic meningoencephalitis in infants
Mei Xie, Zhen Zhou, Suhua Guo, Zengqing Li, Hui Zhao, Jiusheng Deng
Medicine.2019; 98(35): e16985. CrossRef
Magnetic resonance imaging findings and clinical manifestations in cerebral angiostrongyliasis from Dali, China
Bin Yang, Ling Yang, Yili Chen, Guangming Lu
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Geographic distribution of Angiostrongylus cantonensis in wild rats (Rattus rattus) and terrestrial snails in Florida, USA
Heather D. Stockdale Walden, John D. Slapcinsky, Shannon Roff, Jorge Mendieta Calle, Zakia Diaz Goodwin, Jere Stern, Rachel Corlett, Julia Conway, Antoinette McIntosh, Heike Lutermann
PLOS ONE.2017; 12(5): e0177910. CrossRef
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Megan H. Tucker, Jonathan Holmes, Susan Harley, Maria Roca Garcia, Haidee Custodio
Pediatrics In Review.2017; 38(9): 435. CrossRef
Angiostrongylus cantonensis: a review of its distribution, molecular biology and clinical significance as a human pathogen
JOEL BARRATT, DOUGLAS CHAN, INDY SANDARADURA, RICHARD MALIK, DEREK SPIELMAN, ROGAN LEE, DEBORAH MARRIOTT, JOHN HARKNESS, JOHN ELLIS, DAMIEN STARK
Parasitology.2016; 143(9): 1087. CrossRef
L’angiostrongylose humaine : une maladie tropicale négligée
Loïc Epelboin, Louis Collet, Maxime Raz, Nicolas Villemant, Denis Malvy, Renaud Blondé
Revue Francophone des Laboratoires.2016; 2016(483): 45. CrossRef
Development of Lateral Flow Immunoassay for Antigen Detection in Human Angiostrongylus cantonensis Infection
Mu-Xin Chen, Jia-Xu Chen, Shao-Hong Chen, Da-Na Huang, Lin Ai, Ren-Li Zhang
The Korean Journal of Parasitology.2016; 54(3): 375. CrossRef
Angiostrongylus cantonensisInfection: A Cause of Fever of Unknown Origin in Pediatric Patients
Catherine E. Foster, Erin G. Nicholson, Angela C. Chun, Maya Gharfeh, Sara Anvari, Filiz O. Seeborg, Michael A. Lopez, Judith R. Campbell, Lucila Marquez, Jeffrey R. Starke, Debra L. Palazzi
Clinical Infectious Diseases.2016; 63(11): 1475. CrossRef
Angiostrongylus cantonensis Infection on Mayotte Island, Indian Ocean, 2007-2012
Loïc Epelboin, Renaud Blondé, Abdourahim Chamouine, Alexandra Chrisment, Laure Diancourt, Nicolas Villemant, Agnès Atale, Claire Cadix, Valérie Caro, Denis Malvy, Louis Collet, Malcolm Jones
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Scientific Reports.2015;[Epub] CrossRef

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Brief Communication

STAT6 Expression and IL-13 Production in Association with Goblet Cell Hyperplasia and Worm Expulsion of Gymnophalloides seoi from C57BL/6 Mice: Jin-Joo Lee, Donghee Kim, Kyoung-Ho Pyo, Min-Ki Kim, Hyo-Jin Kim, Jong-Yil Chai, Eun-Hee Shin; Korean J Parasitol 2013;51(5):589-594.
Published online October 31, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.5.589

Abstract
PDF

In intestinal helminth infections, Th2 immune respones are generally associated with mucin secretion for worm expulsion from the host intestine. In particular, IL-4 and IL-13 are the important cytokines related with intestinal mucus production via STAT6 signalling in nematode infections. However, this perspective has never been studied in Gymnophalloides seoi infection. The present study aimed to observe the STAT6 signalling and cytokine responses in C57BL/6 mice, a mouse strain resistant to infection with this trematode. The results showed that worm expulsion occurred actively during days 1-2 post-infection (PI), when goblet cells began to proliferate in the small intestine. The STAT6 gene expression in the mouse spleen became remarkable from day 2 PI. Moreover, G. seoi infection induced a significant increase of IL-13 from day 4 PI in the spleen of infected mice. Our results suggested that goblet cell hyperplasia and worm expulsion in G. seoi-infected mice should be induced by STAT6 signalling, in which IL-13 may be involved as a dominant triggering cytokine.

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Jenny K. Gustafsson, Gunnar C. Hansson
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International Immunopharmacology.2016; 36: 199. CrossRef
Increased Intestinal Epithelial Cell Turnover and Intestinal Motility in Gymnophalloides seoi-Infected C57BL/6 Mice
Sang Hyub Lee, Bong-Kwang Jung, Jae-Hwan Park, Eun-Hee Shin, Jong-Yil Chai
The Korean Journal of Parasitology.2014; 52(3): 273. CrossRef

8,999 View
88 Download
Crossref

Original Article

Identification of Atg8 Isoform in Encysting Acanthamoeba: Eun-Kyung Moon, Yeonchul Hong, Dong-Il Chung, Hyun-Hee Kong; Korean J Parasitol 2013;51(5):497-502.
Published online October 31, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.5.497

Abstract
PDF

Autophagy-related protein 8 (Atg8) is an essential component of autophagy formation and encystment of cyst-forming parasites, and some protozoa, such as, Acanthamoeba, Entamoeba, and Dictyostelium, have been reported to possess a type of Atg8. In this study, an isoform of Atg8 was identified and characterized in Acanthamoeba castellanii (AcAtg8b). AcAtg8b protein was found to encode 132 amino acids and to be longer than AcAtg8 protein, which encoded 117 amino acids. Real-time PCR analysis showed high expression levels of AcAtg8b and AcAtg8 during encystation. Fluorescence microscopy demonstrated that AcAtg8b is involved in the formation of the autophagosomal membrane. Chemically synthesized siRNA against AcAtg8b reduced the encystation efficiency of Acanthamoeba, confirming that AcAtg8b, like AcAtg8, is an essential component of cyst formation in Acanthamoeba. Our findings suggest that Acanthamoeba has doubled the number of Atg8 gene copies to ensure the successful encystation for survival when 1 copy is lost. These 2 types of Atg8 identified in Acanthamoeba provide important information regarding autophagy formation, encystation mechanism, and survival of primitive, cyst-forming protozoan parasites.

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Encystment and Excystment Processes in Acanthamoeba castellanii: An Emphasis on Cellulose Involvement
Mathew Choaji, Ascel Samba-Louaka, Zineb Fechtali-Moute, Willy Aucher, Sébastien Pomel
Pathogens.2025; 14(3): 268. CrossRef
Efficacy of propolis extract and eye drop solutions to suppress encystation and excystation of Acanthamoeba triangularis WU19001-T4 genotype
Suthinee Sangkanu, Abolghasem Siyadatpanah, Roghayeh Norouzi, Julalak Chuprom, Watcharapong Mitsuwan, Sirirat Surinkaew, Rachasak Boonhok, Alok K. Paul, Tooba Mahboob, Imran Sama-ae, Sonia M. R. Oliveira, Tajudeen O. Jimoh, Maria de Lourdes Pereira, Polra
PeerJ.2024; 12: e16937. CrossRef
Ac-HSP20 regulates autophagy and promotes the encystation of Acanthamoeba castellanii by inhibiting the PI3K/AKT/mTOR signaling pathway
Siyao Guo, Di Liu, Xi Wan, Dingrui Guo, Meiyu Zheng, Wenyu Zheng, Xianmin Feng
Parasites & Vectors.2024;[Epub] CrossRef
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Rajalakshmy Ayilam Ramachandran, Jose Marcos Sanches, Danielle M. Robertson
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Rachasak Boonhok, Suthinee Sangkanu, Suganya Phumjan, Ramita Jongboonjua, Nawarat Sangnopparat, Pattamaporn Kwankaew, Aman Tedasen, Chooi Ling Lim, Maria de Lourdes Pereira, Mohammed Rahmatullah, Polrat Wilairatana, Christophe Wiart, Karma G. Dolma, Alok
PeerJ.2022; 10: e13657. CrossRef
Proteomic analysis of Atg8-dependent recruitment of phagosomal proteins in the enteric protozoan parasite Entamoeba histolytica
Kumiko Nakada-Tsukui, Natsuki Watanabe, Kumiko Shibata, Ratna Wahyuni, Eri Miyamoto, Tomoyoshi Nozaki
Frontiers in Cellular and Infection Microbiology.2022;[Epub] CrossRef
Stimulation of Acanthamoeba castellanii excystment by enzyme treatment and consequences on trophozoite growth
Zineb Fechtali-Moute, Philippe M. Loiseau, Sébastien Pomel
Frontiers in Cell and Developmental Biology.2022;[Epub] CrossRef
Phragmites australis (Cav.) Trin. ex Steud. Extract Induces Apoptosis-like Programmed Cell Death in Acanthamoeba castellanii Trophozoites
Hương-Giang Lê, Ji-Su Choi, Buyng-Su Hwang, Yong-Tae Jeong, Jung-Mi Kang, Tuấn-Cường Võ, Pyo-Yun Cho, Young-Kyung Lee, Won-Gi Yoo, Yeonchul Hong, Young-Taek Oh, Byoung-Kuk Na
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Parasitology.2021; 148(9): 1074. CrossRef
Peganum harmala Extract Has Antiamoebic Activity to Acanthamoeba triangularis Trophozoites and Changes Expression of Autophagy-Related Genes
Rachasak Boonhok, Suthinee Sangkanu, Julalak Chuprom, Mayuna Srisuphanunt, Roghayeh Norouzi, Abolghasem Siyadatpanah, Farzaneh Mirzaei, Watcharapong Mitsuwan, Sueptrakool Wisessombat, Maria de Lourdes Pereira, Mohammed Rahmatullah, Polrat Wilairatana, Chr
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Maryia Karpiyevich, Katerina Artavanis-Tsakonas
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Encystation: the most prevalent and underinvestigated differentiation pathway of eukaryotes
Pauline Schaap, Christina Schilde
Microbiology.2018; 164(5): 727. CrossRef
Autophagy protein 12 plays an essential role in Acanthamoeba encystation
So-Hee Kim, Eun-Kyung Moon, Yeonchul Hong, Dong-Il Chung, Hyun-Hee Kong
Experimental Parasitology.2015; 159: 46. CrossRef
Autophagy Inhibitors as a Potential Antiamoebic Treatment for Acanthamoeba Keratitis
Eun-Kyung Moon, So-Hee Kim, Yeonchul Hong, Dong-Il Chung, Youn-Kyoung Goo, Hyun-Hee Kong
Antimicrobial Agents and Chemotherapy.2015; 59(7): 4020. CrossRef

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Brief Communications

Short-Cut Pathway to Synthesize Cellulose of Encysting Acanthamoeba: Eun-Kyung Moon, Hyun-Hee Kong; Korean J Parasitol 2012;50(4):361-364.
Published online November 26, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.4.361

Abstract
PDF

The mature cyst of Acanthamoeba is highly resistant to various antibiotics and therapeutic agents. Cyst wall of Acanthamoeba are composed of cellulose, acid-resistant proteins, lipids, and unidentified materials. Because cellulose is one of the primary components of the inner cyst wall, cellulose synthesis is essential to the process of cyst formation in Acanthamoeba. In this study, we hypothesized the key and short-step process in synthesis of cellulose from glycogen in encysting Acanthamoeba castellanii, and confirmed it by comparing the expression pattern of enzymes involving glycogenolysis and cellulose synthesis. The genes of 3 enzymes, glycogen phosphorylase, UDP-glucose pyrophosphorylase, and cellulose synthase, which are involved in the cellulose synthesis, were expressed high at the 1st and 2nd day of encystation. However, the phosphoglucomutase that facilitates the interconversion of glucose 1-phosphate and glucose 6-phosphate expressed low during encystation. This report identified the short-cut pathway of cellulose synthesis required for construction of the cyst wall during the encystation process in Acanthamoeba. This study provides important information to understand cyst wall formation in encysting Acanthamoeba.

Citations

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Encystment and Excystment Processes in Acanthamoeba castellanii: An Emphasis on Cellulose Involvement
Mathew Choaji, Ascel Samba-Louaka, Zineb Fechtali-Moute, Willy Aucher, Sébastien Pomel
Pathogens.2025; 14(3): 268. CrossRef
Inhibition of GABA metabolism by β-lactam antibiotics affects encystation in Acanthamoeba
Chih-Ming Tsai, Yao-Tsung Chang, Yu-Jen Wang, Chun-Hsien Chen, Chuan-Yi Wang, Jian-Ming Huang
Biomedicine & Pharmacotherapy.2025; 193: 118841. CrossRef
Oxidase enzyme genes are differentially expressed during Acanthamoeba castellanii encystment
Christian Q. Scheckhuber, Rebeca Damián Ferrara, Jesús Gómez-Montalvo, Sutherland K. Maciver, Alvaro de Obeso Fernández del Valle
Parasitology Research.2024;[Epub] CrossRef
Biological characteristics and pathogenicity of Acanthamoeba
Yuehua Wang, Linzhe Jiang, Yitong Zhao, Xiaohong Ju, Le Wang, Liang Jin, Ryan D. Fine, Mingguang Li
Frontiers in Microbiology.2023;[Epub] CrossRef
Curcumin effect on Acanthamoeba triangularis encystation under nutrient starvation
Rachasak Boonhok, Suthinee Sangkanu, Suganya Phumjan, Ramita Jongboonjua, Nawarat Sangnopparat, Pattamaporn Kwankaew, Aman Tedasen, Chooi Ling Lim, Maria de Lourdes Pereira, Mohammed Rahmatullah, Polrat Wilairatana, Christophe Wiart, Karma G. Dolma, Alok
PeerJ.2022; 10: e13657. CrossRef
Stimulation of Acanthamoeba castellanii excystment by enzyme treatment and consequences on trophozoite growth
Zineb Fechtali-Moute, Philippe M. Loiseau, Sébastien Pomel
Frontiers in Cell and Developmental Biology.2022;[Epub] CrossRef
Mechanisms of Effector-Mediated Immunity Revealed by the Accidental Human Pathogen Legionella pneumophila
Tshegofatso Ngwaga, Deepika Chauhan, Stephanie R. Shames
Frontiers in Cellular and Infection Microbiology.2021;[Epub] CrossRef
Peganum harmala Extract Has Antiamoebic Activity to Acanthamoeba triangularis Trophozoites and Changes Expression of Autophagy-Related Genes
Rachasak Boonhok, Suthinee Sangkanu, Julalak Chuprom, Mayuna Srisuphanunt, Roghayeh Norouzi, Abolghasem Siyadatpanah, Farzaneh Mirzaei, Watcharapong Mitsuwan, Sueptrakool Wisessombat, Maria de Lourdes Pereira, Mohammed Rahmatullah, Polrat Wilairatana, Chr
Pathogens.2021; 10(7): 842. CrossRef
Evolution and function of carbohydrate reserve biosynthesis in parasitic protists
Julie E. Ralton, M. Fleur Sernee, Malcolm J. McConville
Trends in Parasitology.2021; 37(11): 988. CrossRef
The role of the Acanthamoeba castellanii Sir2-like protein in the growth and encystation of Acanthamoeba
So-Young Joo, Ja Moon Aung, Minsang Shin, Eun-Kyung Moon, Hyun-Hee Kong, Youn-Kyoung Goo, Dong-Il Chung, Yeonchul Hong
Parasites & Vectors.2020;[Epub] CrossRef
Encystation: the most prevalent and underinvestigated differentiation pathway of eukaryotes
Pauline Schaap, Christina Schilde
Microbiology.2018; 164(5): 727. CrossRef
Down-Regulation of Cellulose Synthase Inhibits the Formation of Endocysts in Acanthamoeba
Eun-Kyung Moon, Yeonchul Hong, Dong-Il Chung, Youn-Kyoung Goo, Hyun-Hee Kong
The Korean Journal of Parasitology.2014; 52(2): 131. CrossRef

10,063 View
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PCR for Diagnosis of Male Trichomonas vaginalis Infection with Chronic Prostatitis and Urethritis: Jong Jin Lee, Hong Sang Moon, Tchun Yong Lee, Hwan Sik Hwang, Myoung-Hee Ahn, Jae-Sook Ryu; Korean J Parasitol 2012;50(2):157-159.
Published online May 24, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.2.157

Abstract
PDF

The aim of this study was to assess the usefulness of PCR for diagnosis of Trichomonas vaginalis infection among male patients with chronic recurrent prostatitis and urethritis. Between June 2001 and December 2003, a total of 33 patients visited the Department of Urology, Hanyang University Guri Hospital and were examined for T. vaginalis infection by PCR and culture in TYM medium. For the PCR, we used primers based on a repetitive sequence cloned from T. vaginalis (TV-E650). Voided bladder urine (VB1 and VB3) was sampled from 33 men with symptoms of lower urinary tract infection (urethral charge, residual urine sensation, and frequency). Culture failed to detect any T. vaginalis infection whereas PCR identified 7 cases of trichomoniasis (21.2%). Five of the 7 cases had been diagnosed with prostatitis and 2 with urethritis. PCR for the 5 prostatitis cases yielded a positive 330 bp band from bothVB1 and VB3, whereas positive results were only obtained from VB1 for the 2 urethritis patients. We showed that the PCR method could detect T. vaginalis when there was only 1 T. vaginalis cell per PCR mixture. Our results strongly support the usefulness of PCR on urine samples for detecting T. vaginalis in chronic prostatitis and urethritis patients.

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Original Article

Anti-Apoptotic Effects of SERPIN B3 and B4 via STAT6 Activation in Macrophages after Infection with Toxoplasma gondii: Kyoung Ju Song, Hye-Jin Ahn, Ho-Woo Nam; Korean J Parasitol 2012;50(1):1-6.
Published online March 6, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.1.1

Abstract
PDF

Toxoplasma gondii penetrates all kinds of nucleated eukaryotic cells but modulates host cells differently for its intracellular survival. In a previous study, we found out that serine protease inhibitors B3 and B4 (SERPIN B3/B4 because of their very high homology) were significantly induced in THP-1-derived macrophages infected with T. gondii through activation of STAT6. In this study, to evaluate the effects of the induced SERPIN B3/B4 on the apoptosis of T. gondii-infected THP-1 cells, we designed and tested various small interfering (si-) RNAs of SERPIN B3 or B4 in staurosporine-induced apoptosis of THP-1 cells. Anti-apoptotic characteristics of THP-1 cells after infection with T. gondii disappeared when SERPIN B3/B4 were knock-downed with gene specific si-RNAs transfected into THP-1 cells as detected by the cleaved caspase 3, poly-ADP ribose polymerase and DNA fragmentation. This anti-apoptotic effect was confirmed in SERPIN B3/B4 overexpressed HeLa cells. We also investigated whether inhibition of STAT6 affects the function of SERPIN B3/B4, and vice versa. Inhibition of SERPIN B3/B4 did not influence STAT6 expression but SERPIN B3/B4 expression was inhibited by STAT6 si-RNA transfection, which confirmed that SERPIN B3/B4 was induced under the control of STAT6 activation. These results suggest that T. gondii induces SERPIN B3/B4 expression via STAT6 activation to inhibit the apoptosis of infected THP-1 cells for longer survival of the intracellular parasites themselves.

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Case Report

Severe Tick Infestation in a Hare and Potential Risk for Transmitting Pathogens to Humans: Weiqing Zheng, Haiying Chen, Xiaoqing Liu, Xuejian Guo, Renlong Fu; Korean J Parasitol 2011;49(4):419-422.
Published online December 16, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.4.419

Abstract
PDF

Severe tick infestation was found in a hare in a suburban area of Nanchang, Jiangxi Province, China. We sampled ticks and identified them based on their morphologic characteristics. Three species, Ixodes sinensis, which is commonly found in China and can experimentally transmit Borrelia burgdorferi, Rhipicephalus haemaphysaloides, and Haemaphysalis longicornis which can transmit Lyme disease were detected with an optical microscope and a stereomicroscope. Risk of spreading ticks from suburban to urban areas exists due to human transportation and travel between the infested and non-infested areas around Nanchang.

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Original Articles

Microarray Analysis of Differentially Expressed Genes between Cysts and Trophozoites of Acanthamoeba castellanii: Eun-Kyung Moon, Ying-Hua Xuan, Dong-Il Chung, Yeonchul Hong, Hyun-Hee Kong; Korean J Parasitol 2011;49(4):341-347.
Published online December 16, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.4.341

Abstract
PDF

Acanthamoeba infection is difficult to treat because of the resistance property of Acanthamoeba cyst against the host immune system, diverse antibiotics, and therapeutic agents. To identify encystation mediating factors of Acanthamoeba, we compared the transcription profile between cysts and trophozoites using microarray analysis. The DNA chip was composed of 12,544 genes based on expressed sequence tag (EST) from an Acanthamoeba ESTs database (DB) constructed in our laboratory, genetic information of Acanthamoeba from TBest DB, and all of Acanthamoeba related genes registered in the NCBI. Microarray analysis indicated that 701 genes showed higher expression than 2 folds in cysts than in trophozoites, and 859 genes were less expressed in cysts than in trophozoites. The results of real-time PCR analysis of randomly selected 9 genes of which expression was increased during cyst formation were coincided well with the microarray results. Eukaryotic orthologous groups (KOG) analysis showed an increment in T article (signal transduction mechanisms) and O article (posttranslational modification, protein turnover, and chaperones) whereas significant decrement of C article (energy production and conversion) during cyst formation. Especially, cystein proteinases showed high expression changes (282 folds) with significant increases in real-time PCR, suggesting a pivotal role of this proteinase in the cyst formation of Acanthamoeba. The present study provides important clues for the identification and characterization of encystation mediating factors of Acanthamoeba.

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Parasitic Helminth Cystatin Inhibits DSS-Induced Intestinal Inflammation Via IL-10⁺F4/80⁺ Macrophage Recruitment: Sung Won Jang, Min Kyoung Cho, Mi Kyung Park, Shin Ae Kang, Byoung-Kuk Na, Soon Cheol Ahn, Dong-Hee Kim, Hak Sun Yu; Korean J Parasitol 2011;49(3):245-254.
Published online September 30, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.3.245

Abstract
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Many immune down-regulatory molecules have been isolated from parasites, including cystatin (cystain protease inhibitor). In a previous study, we isolated and characterized Type I cystatin (CsStefin-1) of the liver fluke, Clonorchis sinensis. To investigate whether the CsStefin-1 might be a new host immune modulator, we induced intestinal inflammation in mice by dextran sodium sulfate (DSS) and treated them with recombinant CsStefin-1 (rCsStefin-1). The disease activity index (DAI) increased in DSS only-treated mice. In contrast, the DAI value was significantly reduced in rCsStefin-1-treated mice than DSS only-treated mice. In addition, the colon length of DSS only-treated mice was shorter than that of rCsStefin-1 treated mice. The secretion levels of IFN-γ and TNF-α in the spleen and mesenteric lymph nodes (MLNs) were significantly increased by DSS treatment, but the level of TNF-α in MLNs was significantly decreased by rCsStefin-1 treatment. IL-10 production in both spleen and MLNs was significantly increased, and IL-10⁺F4/80⁺ macrophage cells were significantly increased in the spleen and MLNs of rCsStefin-1 treated mice after DSS treatment. In conclusion, rCsStefin-1 could reduce the intestinal inflammation occurring after DSS treatment, these effects might be related with recruitment of IL-10 secreting macrophages.

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Atg3-Mediated Lipidation of Atg8 Is Involved in Encystation of Acanthamoeba: Eun-Kyung Moon, Dong-Il Chung, Yeonchul Hong, Hyun-Hee Kong; Korean J Parasitol 2011;49(2):103-108.
Published online June 14, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.2.103

Abstract
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Autophagy is a catabolic process involved in the degradation of a cell's own components for cell growth, development, homeostasis, and the recycling of cellular products. Autophagosome is an essential component in the protozoan parasite during differentiation and encystation. The present study identified and characterized autophagy-related protein (Atg) 3, a member of Atg8 conjugation system, in Acanthamoeba castellanii (AcAtg3). AcAtg3 encoding a 304 amino acid protein showed high similarity with the catalytic cysteine site of other E2 like enzymes of ubiquitin system. Predicted 3D structure of AcAtg3 revealed a hammer-like shape, which is the characteristic structure of E2-like enzymes. The expression level of AcAtg3 did not increase during encystation. However, the formation of mature cysts was significantly reduced in Atg3-siRNA transfected cells in which the production of Atg8-phosphatidylethanolamine conjugate was inhibited. Fluorescent microscopic analysis revealed that dispersed AcAtg3-EGFP fusion protein gathered around autophagosomal membranes during encystation. These results provide important information for understanding autophagic machinery through the lipidation reaction mediated by Atg3 in Acanthamoeba.

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Eun-Kyung Moon, Ying-Hua Xuan, Dong-Il Chung, Yeonchul Hong, Hyun-Hee Kong
The Korean Journal of Parasitology.2011; 49(4): 341. CrossRef

10,166 View
94 Download
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Survey of Flea Infestation in Dogs in Different Geographical Regions of Iran: Mosa Tavassoli, Amir Ahmadi, Abbas Imani, Emad Ahmadiara, Shahram Javadi, Mojtaba Hadian; Korean J Parasitol 2010;48(2):145-149.
Published online June 17, 2010; DOI: https://doi.org/10.3347/kjp.2010.48.2.145

Abstract
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Medically important arthropods, including fleas, play an important role in causing clinical disorders and disease in man and domestic animals. This study was conducted to determine the seasonal flea infestations for domestic dogs from different geographic regions of Iran. A total of 407 fleas, belonging to 5 different species, were recovered from 83 domestic dogs from 3 regions. There was a distinctive pattern of species distribution and infestations with the highest infestation rates observed in a temperate climate and higher rainfall. Additionally, fleas were observed over all seasons, except February and March, with the highest infestation rate observed in August (24.7%) and the lowest rate in January (1.7%). They also parasitize dogs with a different spectrum of species. The cat flea, Ctenocephalides felis (67.5%), exhibited the highest prevalence among all flea species found on dogs. Thus, climatic conditions and seasonal patterns impact on flea infestation and must be considered in developing control programs.

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Molecular Identification, Multigenic Characterization and Phylogenetic Analysis of Ctenocephalides Canis Fleas from Humans and Domestic Animals in Iran
Shahin Seidi, Mousa Tavassoli, Farnaz Malekifard, Mourad Ben Said
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Mohammad Bagher Ghavami, Habibeh Mirzadeh, Jamshid Mohammadi, Asghar Fazaeli
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S. J. Seyyed‐Zadeh, F. Bozorg‐Omid, Z. Telmadarraiy, O. Terenius, A. R. Chavshin
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Prevalence and Potential Risk Factors forBartonellaInfection in Tunisian Stray Dogs
Jaber Belkhiria, Bruno B. Chomel, Taoufik Ben Hamida, Rickie W. Kasten, Matthew J. Stuckey, Drew A. Fleischman, Mary M. Christopher, Henri-Jean Boulouis, Thomas B. Farver
Vector-Borne and Zoonotic Diseases.2017; 17(6): 388. CrossRef
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Saba Zouari, Fatma Khrouf, Youmna M’ghirbi, Ali Bouattour
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Michael Rust
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Vicente Homero González-Álvarez, Isabel G. Fernández de Mera, Alejandro Cabezas-Cruz, José de la Fuente, Aldo I. Ortega-Morales, Consuelo Almazán
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Molecular detection of zoonotic bartonellae (B. henselae, B. elizabethae and B. rochalimae) in fleas collected from dogs in Israel
S. SOFER, R. GUTIÉRREZ, D. MORICK, K. Y. MUMCUOGLU, S. HARRUS
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Patrick Hensel, Domenico Santoro, Claude Favrot, Peter Hill, Craig Griffin
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Molecular Detection of Rickettsia felis and Bartonella henselae in Dog and Cat Fleas in Central Oromia, Ethiopia
Philippe Parola, Didier Raoult, Bersissa Kumsa, Cristina Socolovschi
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Revista Brasileira de Parasitologia Veterinária.2012; 21(3): 326. CrossRef
Fleas as parasites of the family Canidae
Gerhard Dobler, Martin Pfeffer
Parasites & Vectors.2011;[Epub] CrossRef

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IL-4 Independent Nuclear Translocalization of STAT6 in HeLa Cells by Entry of Toxoplasma gondii: Hye-Jin Ahn, Ji Yeon Kim, Ho-Woo Nam; Korean J Parasitol 2009;47(2):117-124.
Published online May 27, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.2.117

Abstract
PDF

Toxoplasma gondii provokes rapid and sustained nuclear translocation of the signal transducer and activator of transcription 6 (STAT6) in HeLa cells. We observed activation of STAT6 as early as 2 hr after infection with T. gondii by the nuclear translocation of fluorescence expressed from exogenously transfected pDsRed2-STAT6 plasmid and by the detection of phosphotyrosine-STAT6 in Western blot. STAT6 activation occurred only by infection with live tachyzoites but not by co-culture with killed tachyzoites or soluble T. gondii extracts. STAT6 phosphorylation was inhibited by small interfering RNA of STAT6 (siSTAT6). In view of the fact that STAT6 is a central mediator of IL-4 induced gene expression, activation of STAT6 by T. gondii infection resembles that infected host cells has been stimulated by IL-4 treatment. STAT1 was affected to increase the transcription and expression by the treatment of siSTAT6. STAT6 activation was not affected by any excess SOCS's whereas that with IL-4 was inhibited by SOCS-1 and SOCS-3. T. gondii infection induced Eotaxin-3 gene expression which was reduced by IFN-γ. These results demonstrate that T. gondii exploits host STAT6 to take away various harmful reactions by IFN-γ. This shows, for the first time, IL-4-like action by T. gondii infection modulates microbicidal action by IFN-γ in infected cells.

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Nuclear Localization and Cleavage of STAT6 Is Induced by Kaposi’s Sarcoma-Associated Herpesvirus for Viral Latency
Chong Wang, Caixia Zhu, Fang Wei, Shujun Gao, Liming Zhang, Yuhong Li, Yanling Feng, Yin Tong, Jianqing Xu, Bin Wang, Zhenghong Yuan, Erle S. Robertson, Qiliang Cai, Paul D. Ling
PLOS Pathogens.2017; 13(1): e1006124. CrossRef
SAG5B and SAG5C combined vaccine protects mice against Toxoplasma gondii infection
Gang Lu, Jian Zhou, Aihua Zhou, Yali Han, Jingjing Guo, Pengxia Song, Huaiyu Zhou, Hua Cong, Ming Hou, Lin Wang, Shenyi He
Parasitology International.2017; 66(5): 596. CrossRef
SAG4 DNA and Peptide Vaccination Provides Partial Protection against T. gondii Infection in BALB/c Mice
Jian Zhou, Lin Wang
Frontiers in Microbiology.2017;[Epub] CrossRef
Afatinib Reduces STAT6 Signaling of Host ARPE-19 Cells Infected with Toxoplasma gondii
Zhaoshou Yang, Hye-Jin Ahn, Young-Hoon Park, Ho-Woo Nam
The Korean Journal of Parasitology.2016; 54(1): 31. CrossRef
Chronic Toxoplasmosis Modulates the Induction of Contact Hypersensitivity by TNCB in Mouse Model
Zhaoshou Yang, Hye-Jin Ahn, Ho-Woo Nam
The Korean Journal of Parasitology.2015; 53(6): 755. CrossRef
Activation of STAT6 by STING Is Critical for Antiviral Innate Immunity
Huihui Chen, Hui Sun, Fuping You, Wenxiang Sun, Xiang Zhou, Lu Chen, Jing Yang, Yutao Wang, Hong Tang, Yukun Guan, Weiwei Xia, Jun Gu, Hiroki Ishikawa, Delia Gutman, Glen Barber, Zhihai Qin, Zhengfan Jiang
Cell.2011; 147(2): 436. CrossRef
Deactivation of STAT6 through Serine 707 Phosphorylation by JNK
Takashi Shirakawa, Yoshinori Kawazoe, Tomoko Tsujikawa, Dongju Jung, Shin-ichi Sato, Motonari Uesugi
Journal of Biological Chemistry.2011; 286(5): 4003. CrossRef
Coactivator P100 Protein Enhances STAT6‐Dependent Transcriptional Activation But Has No Effect on STAT1‐Mediated Gene Transcription
Xinting Wang, Xin Liu, Jianfei Fang, Yanxin Lu, Jinyan He, Xuyang Yao, Zhi Yao, Jie Yang
The Anatomical Record.2010; 293(6): 1010. CrossRef
Toxoplasma Rhoptry Protein 16 (ROP16) Subverts Host Function by Direct Tyrosine Phosphorylation of STAT6
Yi-Ching Ong, Michael L. Reese, John C. Boothroyd
Journal of Biological Chemistry.2010; 285(37): 28731. CrossRef
STAT6 activation by Toxoplasma gondii infection induces the expression of Th2 C-C chemokine ligands and B clade serine protease inhibitors in macrophage
Hye-Jin Ahn, Ji Yeon Kim, Kyung-Ju Ryu, Ho-Woo Nam
Parasitology Research.2009; 105(5): 1445. CrossRef

11,068 View
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Construction of EST Database for Comparative Gene Studies of Acanthamoeba: Eun-Kyung Moon, Joung-Ok Kim, Ying-Hua Xuan, Young-Sun Yun, Se Won Kang, Yong Seok Lee, Tae-In Ahn, Yeon-Chul Hong, Dong-Il Chung, Hyun-Hee Kong; Korean J Parasitol 2009;47(2):103-107.
Published online May 26, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.2.103

Abstract
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The genus Acanthamoeba can cause severe infections such as granulomatous amebic encephalitis and amebic keratitis in humans. However, little genomic information of Acanthamoeba has been reported. Here, we constructed Acanthamoeba expressed sequence tags (EST) database (Acanthamoeba EST DB) derived from our 4 kinds of Acanthamoeba cDNA library. The Acanthamoeba EST DB contains 3,897 EST generated from amebae under various conditions of long term in vitro culture, mouse brain passage, or encystation, and downloaded data of Acanthamoeba from National Center for Biotechnology Information (NCBI) and Taxonomically Broad EST Database (TBestDB). The almost reported cDNA/genomic sequences of Acanthamoeba provide stand alone BLAST system with nucleotide (BLAST NT) and amino acid (BLAST AA) sequence database. In BLAST results, each gene links for the significant information including sequence data, gene orthology annotations, relevant references, and a BlastX result. This is the first attempt for construction of Acanthamoeba database with genes expressed in diverse conditions. These data were integrated into a database (http://www.amoeba.or.kr).

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Pooja Salunke, Kiran Kondabagil, Yogesh A. Karpe
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Yuehua Wang, Linzhe Jiang, Yitong Zhao, Xiaohong Ju, Le Wang, Liang Jin, Ryan D. Fine, Mingguang Li
Frontiers in Microbiology.2023;[Epub] CrossRef
Autophagy protein 12 plays an essential role in Acanthamoeba encystation
So-Hee Kim, Eun-Kyung Moon, Yeonchul Hong, Dong-Il Chung, Hyun-Hee Kong
Experimental Parasitology.2015; 159: 46. CrossRef
Caspase-like proteins: Acanthamoeba castellanii metacaspase and Dictyostelium discoideum paracaspase, what are their functions?
Entsar Saheb, Wendy Trzyna, John Bush
Journal of Biosciences.2014; 39(5): 909. CrossRef
Helminth parasites of fish and shellfish from the Santa Gilla Lagoon in southern Sardinia, Italy
J. Culurgioni, A. Sabatini, R. De Murtas, S. Mattiucci, V. Figus
Journal of Helminthology.2014; 88(04): 489. CrossRef
Microarray and KOG analysis of Acanthamoeba healyi genes up-regulated by mouse-brain passage
Eun-Kyung Moon, Ying-Hua Xuan, Hyun-Hee Kong
Experimental Parasitology.2014; 143: 69. CrossRef
Protein kinase C signaling molecules regulate encystation of Acanthamoeba
Eun-Kyung Moon, Dong-Il Chung, Yeonchul Hong, Hyun-Hee Kong
Experimental Parasitology.2012; 132(4): 524. CrossRef
Microarray Analysis of Differentially Expressed Genes between Cysts and Trophozoites ofAcanthamoeba castellanii
Eun-Kyung Moon, Ying-Hua Xuan, Dong-Il Chung, Yeonchul Hong, Hyun-Hee Kong
The Korean Journal of Parasitology.2011; 49(4): 341. CrossRef
Drug target identification, validation, characterisation and exploitation for treatment of Acanthamoeba (species) infections
Craig W. Roberts, Fiona L. Henriquez
Experimental Parasitology.2010; 126(1): 91. CrossRef
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Yong-Seok Lee, Moon-Ki Baek, Yong-Hun Jo, Se-Won Kang, Jae-Bong Lee, Yeon-Soo Han, Hee-Jae Cha, Hak-Sun Yu, Mee-Sun Ock
Journal of Life Science.2010; 20(3): 411. CrossRef

10,256 View
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Case Report

Disseminated Microfilaremia Associated with Lung Cyst and Empyema: An Autopsy Report: Kirti Gupta, Uma Nahar Saikia, Prateek Bhatia, Mandeep Garg, Ajay Wanchu; Korean J Parasitol 2009;47(1):49-52.
Published online March 12, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.1.49

Abstract
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Clinical manifestations of extralymphatic disease caused by filariasis are varied and range from symptoms due to tropical pulmonary eosinophilia to hematuria, proteinuria, splenomegaly, and rarely arthritis. Disseminated microfilaremia in association with loculated lung cyst and empyema is of rare occurrence and to the best of our knowledge has not been documented in the literature so far. We report here a case of disseminated microfilaremia due to Wuchereria bancrofti infection accompanied by a lung cyst and empyema in a 21-year-old Indian man.

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Immunopathological response of leukocytes against microfilariae and adult worms in white rats infected with Setaria cervi
Sharba Kausar, Wajihullah Khan
Veterinary World.2017; 10(5): 562. CrossRef
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Original Article

A Nationwide Survey on the Prevalence of Intestinal Parasitic Infections in the Republic of Korea, 2004: Tong-Soo Kim, Shin-Hyeong Cho, Sun Huh, Yoon Kong, Woon-Mok Sohn, Seung-Sik Hwang, Jong-Yil Chai, Soon-Hyung Lee, Yun-Kyu Park, Dae-Kyu Oh, Jong-Koo Lee; Korean J Parasitol 2009;47(1):37-47.
Published online March 12, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.1.37

Abstract
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National surveys on the prevalence of intestinal parasitic infections have been carried out every 5-7 years since 1971 in the Republic of Korea in order to establish control measures. The present nationwide survey was conducted from June to December 2004. The 10% population sampling data of Population and Housing Census by the Korean government in 2000 was used as the survey population. One sample was selected randomly from each of the 22,858 registered subjects, and a total of 20,541 people were ultimately included in this survey. Fecal examinations were performed by the cellophane thick smear and saturated brine flotation techniques. Pinworm infection was examined by cello-tape anal swab method. This survey also included a questionnaire study for a socioeconomic analysis. The total helminth egg positive rate was 3.7%, and the estimated total positive number among nationwide people was 1,780,000. The rates in urban and rural areas were 3.1% and 6.8%, respectively. As the total egg positive rate in the 6th survey in 1997 was 2.4%, the present survey showed that there was a considerable degree of increase in the prevalence rate of intestinal parasitic infections over the 7-year period following the 6th survey. The largest increases occurred in the egg positive rates of Clonorchis sinensis and heterophyids including Metagonimus yokogawai.

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Case Report

The First Outbreak of Chorioptes texanus (Acari: Psoroptidae) Infestation in a Cattle Farm in Korea: Guk-Hyun Suh, Tai-Young Hur, Sun Lim, Sang-Min Shin, Jungkee Kwon, Shin-Hyeong Cho, Chai-Yong Lee, Sung-Shik Shin; Korean J Parasitol 2008;46(4):273-278.
Published online December 20, 2008; DOI: https://doi.org/10.3347/kjp.2008.46.4.273

Abstract
PDF

Mites in the genus Chorioptes cause a mild form of skin disease in both domestic and wild ruminants. In July 2006, dermatitis characterized by alopecia, marked lichenification, accumulation of crust, and fissuring was recognized in 14 out of 200 Holstein dairy cattle raised in the cattle farm of the National Institute of Animal Science in Cheonan, Republic of Korea. Skin lesions were distributed mainly over the tail base, and sacral and perineal regions. Microscopic examinations of skin scraping samples from severely affected areas revealed numerous mites of all developmental stages. Morphologically, pedicels of the mites were short and unjointed. The tarsal suckers occurred on the pedicels of all the legs in the male worm and on the first, second, and fourth pair of legs in the adult female worm. A single long seta at the tarsus of legs III and the length of legs II being about twice as long as legs IV in adult male mites were observed. Arising anterior to the inner-most spatulate seta was a short seta with an average of 26.4 ± 5.8 ?m in length. Also, the length of setae #4 on the opisthosomal lobes was relatively short. Based on these observations, the mites were identified as Choriptes texanus. Although the chorioptic mange may not influence the mortality rate in the affected farm, reports indicate that a decline in milk production can be observed. This is the first report of chorioptic infestation in a cattle farm from Korea.

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Brief Communication

Differentially expressed genes of Acanthamoeba castellanii during encystation: Eun-Kyung Moon, Dong-Il Chung, Yeon-Chul Hong, Hyun-Hee Kong; Korean J Parasitol 2007;45(4):283-285.
Published online December 20, 2007; DOI: https://doi.org/10.3347/kjp.2007.45.4.283

Abstract
PDF

To examine the expressed gene profile during encystation of Acanthamoeba castellanii Castellani, we used differentially expressed gene (DGE) screening by RT-PCR with 20 sets of random primers. From this analysis, we found that approximately 16 genes showed upregulation during encystation. We chose 6 genes, which had relatively higher expression levels, for further investigation. Based on homology search in database, DEG2 showed 55% of similarity with xylose isomerase, DEG9 showed 37% of similarity with Na P-type ATPase, and DEG14 showed 77% of similarity with subtilisin-like serine proteinase. DEG3 and DEG26 were identified as hypothetical proteins and DEG25 exhibited no significant similarity to any known protein. Encystation of Acanthamoeba has been suggested to be a process to resist adverse environmental or nutritional conditions. Further characterization studies of these genes may provide us with more information on the encystation mechanism of Acanthamoeba.

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So-Hee Kim, Eun-Kyung Moon, Yeonchul Hong, Dong-Il Chung, Hyun-Hee Kong
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Down-Regulation of Cellulose Synthase Inhibits the Formation of Endocysts in Acanthamoeba
Eun-Kyung Moon, Yeonchul Hong, Dong-Il Chung, Youn-Kyoung Goo, Hyun-Hee Kong
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Original Article

In vivo determination of the gap2 gene promoter activity in Giardia lamblia: Hye-Won Yang, Juri Kim, Tai-Soon Yong, Soon-Jung Park; Korean J Parasitol 2006;44(1):21-26.
Published online March 20, 2006; DOI: https://doi.org/10.3347/kjp.2006.44.1.21

Abstract
PDF

A shuttle vector for Escherichia coli and Giardia lamblia was modified to produce a reporter plasmid, which monitors the expression of prescribed gene in G. lamblia by measuring its luciferase activity. Promoter regions of the gap2 gene, one of the genes induced during encystation, were cloned into this plasmid, and the resultant constructs were then transfected into trophozoites of G. lamblia. Transgenic trophozoites containing one of the 3 gap2-luc reporters were induced to encystation, and characterized with respect to gap2 gene expression by measuring their luciferase activities. Giardia containing a gap2-luc fusion of 112-bp upstream region showed full induction of luciferase activity during encystation.

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Eukaryote-conserved histone post-translational modification landscape in Giardia duodenalis revealed by mass spectrometry
Samantha J. Emery-Corbin, Joshua J. Hamey, Balu Balan, Laura Rojas-López, Staffan G. Svärd, Aaron R. Jex
International Journal for Parasitology.2021; 51(4): 225. CrossRef
Trans-spliced Heat Shock Protein 90 Modulates Encystation in Giardia lamblia
Rishi Kumar Nageshan, Nainita Roy, Shatakshi Ranade, Utpal Tatu, Rhoel Ramos Dinglasan
PLoS Neglected Tropical Diseases.2014; 8(5): e2829. CrossRef

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Brief Communications

Infection status of pigs with Cryptosporidium parvum: Jae-Ran Yu, Min Seo; Korean J Parasitol 2004;42(1):45-47.
Published online March 20, 2004; DOI: https://doi.org/10.3347/kjp.2004.42.1.45

Abstract
PDF

To investigate the infection status of pigs with Cryptosporidium parvum, 589 fecal samples were collected from pigs raised at farm in Chungcheongbuk-do and Chungcheongnam-do. Of the 589 pig fecal samples, 62 (10.5%) were positive for C. parvum. The area showing the highest positive rate was Dangjin-gun, Chungcheongnam-do (14.0%), and the lowest (0%) Salmi-myon, Chungcheongbuk-do. The positive rate of C. parvum in Judok-eup increased from 12.7% in the winter to 22.1% in the summer. The results of this study suggest that the pigs may be a source of human C. parvum infection.

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An epidemiological survey on Cryptosporidium parvum infection of inhabitants in Chorwon-gun, Kangwon-do: Min Seo, Sun Huh, Jong-Yil Chai, Jae-Ran Yu; Korean J Parasitol 2001;39(2):201-203.
Published online June 30, 2001; DOI: https://doi.org/10.3347/kjp.2001.39.2.201

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The present study was undertaken to know the infection status of Cryptosporidium parvum among the residents of Chorwon-gun, Kangwon-do in 1993. Total 461 fecal samples were collected from the inhabitants residing in Chorwon-gun during the period of August 12 to September 14, 1993. Fecal smears were prepared by formalin-ether sedimentation, and examined after modified acid fast staining. Of the 461 fecal samples, 9 (1.9%) were positive for C. parvum oocysts. The positive cases were limited to thirties (4) patients, forties (3), and sixties (2), and no oocyst was detected in other age groups. The oocyst positive rate for male was 1.4% and that of female was 2.6%.

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Infestation status of head louse and treatment with lindane shampoo in children of primary school and kindergarten in Chinju-shi, Kyongsangnam-do, Korea: Yong Chan Ha, Jung Min Heo, Hyung Joon Kim, Gi Moon Go, Sang Jeong Lee, Song Hoan Jeong, Seung In Ahn, Min Cheol Kim, Jeong Eun Kim, Hyee Young Song, Jeong Woon Park, Byung Sung Kim, Woon-Mok Sohn; Korean J Parasitol 2000;38(1):41-43.
Published online March 31, 2000; DOI: https://doi.org/10.3347/kjp.2000.38.1.41

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The infestation status of head louse among children attending primary schools and kindergartens in Chinju-shi, Kyongsangnam-do, Korea, was investigated between June and July 1999. Out of 2,288 children examined, 3.9% of boys (48/1,242) and 23.5% of girls (246/1,046) were infested with nits or adult/nymphs of lice. The effectiveness of lindane shampoo (1% gamma benzene hexachloride solution) was evaluated after one or two time applications to all the children infested. The negative conversion rate of pediculosis was 93.5%. Effective control measures are needed to control and prevent such ectoparasite infestation amongst children.

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