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Original Article

Entamoeba histolytica Induces Cell Death of HT29 Colonic Epithelial Cells via NOX1-Derived ROS

Kyeong Ah Kim1,2,3,†, Ju Young Kim1,2,†, Young Ah Lee1,2,3, Arim Min1,2,3, Young Yil Bahk4, Myeong Heon Shin1,2,3
The Korean Journal of Parasitology 2013;51(1):61-68.
Published online: February 18, 2013

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Corresponding author (myeong@yuhs.ac)

†KA Kim and JY Kim equally contributed to this work.

• Received: May 31, 2012   • Revised: November 26, 2012   • Accepted: December 4, 2012

© 2013, Korean Society for Parasitology and Tropical Medicine

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Entamoeba histolytica, which causes amoebic colitis and occasionally liver abscess in humans, is able to induce host cell death. However, signaling mechanisms of colon cell death induced by E. histolytica are not fully elucidated. In this study, we investigated the signaling role of NOX in cell death of HT29 colonic epithelial cells induced by E. histolytica. Incubation of HT29 cells with amoebic trophozoites resulted in DNA fragmentation that is a hallmark of apoptotic cell death. In addition, E. histolytica generate intracellular reactive oxygen species (ROS) in a contact-dependent manner. Inhibition of intracellular ROS level with treatment with DPI, an inhibitor of NADPH oxidases (NOXs), decreased Entamoeba-induced ROS generation and cell death in HT29 cells. However, pan-caspase inhibitor did not affect E. histolytica-induced HT29 cell death. In HT29 cells, catalytic subunit NOX1 and regulatory subunit Rac1 for NOX1 activation were highly expressed. We next investigated whether NADPH oxidase 1 (NOX1)-derived ROS is closely associated with HT29 cell death induced by E. histolytica. Suppression of Rac1 by siRNA significantly inhibited Entamoeba-induced cell death. Moreover, knockdown of NOX1 by siRNA, effectively inhibited E. histolytica-triggered DNA fragmentation in HT29 cells. These results suggest that NOX1-derived ROS is required for apoptotic cell death in HT29 colon epithelial cells induced by E. histolytica.
  • Key words: Entamoeba histolytica, host cell death, HT29 colon epithelial cell, reactive oxygen species (ROS), NADPH oxidase 1 (NOX1)
Tissue-invasive intestinal protozoan parasite, Entamoeba histolytica, causes colitis and liver abscess in human beings [1]. During infection, trophozoites of E. histolytica degrade mucin layer that covers the colon epithelium and then subsequently results in contact-dependent colon cell death [2]. E. histolytica-induced colon cell death is crucial for provocation of neutrophil-mediated tissue inflammation in the amoeba-infected colon lesions [3]. Adherence of amoebae to host cells through amoebic gal-lectin and host β2-integrin induces host cell death in vitro [4,5]. Host cell death induced by E. histolytica does not involve either of the two common cell death signaling pathways of death receptors or mitochondria [6]. It has been reported that intracellular Ca2+ [7], calpain [8], caspase-3 [9], or protein tyrosine phosphatases [10,11] can be a signaling molecule required for E. histolytica-induced host cell death. However, the signaling mechanisms responsible for amoeba-induced host cell death are not fully understood.
NADPH oxidase (NOX)-derived reactive oxygen species (ROS) act as intracellular second messengers for a variety of cellular receptor signal transduction pathways, and they play pivotal roles in various biological activities, including host defense, cell growth and differentiation, stimulation of pro-inflammatory genes, and cell death [12]. In phagocytes, NOX2 has been well known to function as antibacterial host defenses [13]. Recently, 6 homologs of NOX2, including NOX1, NOX3, NOX4, NOX5, dual oxidase 1 (DUOX1), and DUOX2 have been highly expressed in non-phagocytic cells. It is of particular interest that NOX1 expression is abundant in colon tissues and HT29 colonic epithelial tumor cell line [14]. NOX1 plays a crucial role in host defense against symbiotic or infectious microbes in the colon [15,16]. For example, NOX1-derived ROS was produced in guinea pig colon epithelial cells stimulated by recombinant flagellin from Salmonella enteritidis [17]. In the context of host cell death induced by E. histolytica, there is also accumulating evidence that diphenyleneiodonium chloride (DPI)-sensitive NOXs are required for ROS-dependent cell death in neutrophils [18] and Caco2 colon epithelial cells [19] induced by E. histolytica. However, the functional role of NOX1-derived ROS in cell death of HT29 colon epithelial cells induced by E. histolytica has not been elucidated. In this study, using NOX inhibitor DPI and siRNA specific for NOX1, we show that NOX1-derived ROS is closely involved in E. histolytica-induced cell death of HT29 colonic epithelial cells.
Reagents
DPI, pan-caspase inhibitor z-VAD-FMK and rotenone were purchased from EMD Biosciences (Darmstadt, Hesse, Germany). Dichlorodihydrofluorescein diacetate (H2DCFDA) and 5-(and 6)-chloromethyl SNARF-1 were purchased from Molecular Probes (Eugene, Oregon, USA). Rabbit polyclonal antibodies against human NOX1 or Rac1 were purchased from Abcam (Cambridge, UK). Unless stated otherwise, all other reagents were purchased from Sigma-Aldrich (St. Louis, Missouri, USA).
Cultivation of E. histolytica trophozoites and HT29 colon epithelial tumor cell line
E. histolytica (HM1:IMSS strain) trophozoites were subcultivated in screw-capped glass tubes containing TYI-S-33 medium at 37℃. After cultivation for 48 hr, trophozoites in the logarithmic growth phase were harvested and washed with RPMI 1640 medium supplemented with 2 g/L NaHCO3, 50 mg/L gentamicin, 1 g/L human serum albumin, and 10% (v/v) heat-inactivated fetal bovine serum (FBS) and were suspended in the culture medium before being incubated with host cells. HT29 cells (American Type Culture Collection, Manassas, Virginia, USA) were maintained in RPMI 1640 medium or minimal essential medium (MEM) containing 10% heat-inactivated FBS, 100 U/ml penicillin, and 100 µg/ml streptomycin at 37℃ in a humidified 5% CO2 incubator. Amoebae and HT29 cells were always 99% viable before experiments as determined by trypan blue exclusion tests.
Measurement of E. histolytica-induced cell death in HT29 cells
HT29 cells (5×105 cells/sample) seeded in tissue culture plates were incubated with live E. histolytica trophozoites at a ratio of 5:1 and 10:1 for 30 min or 60 min at 37℃ in a CO2 incubator. The percentage of dead HT29 cells was determined by staining with trypan blue dye or propidium iodide (PI). Trypan blue staining for dead cells was performed on at least 300 cells. Flow cytometric analysis following PI staining was performed with a FACScan on at least 3,000 cells from host cell fraction. To assay amoeba-induced DNA fragmentation, HT29 cells (4×106 cells/sample) were co-incubated with E. histolytica trophozoites at a ratio of 10:1 for 30 min or 60 min at 37℃ in a humidified CO2 incubator. To elucidate the role of amoebic galactose binding lectin in DNA fragmentation induced by E. histolytica, HT29 cells were incubated with E. histolytica trophozoites for 30 min or 60 min in the presence of D-galactose (50 mM). After incubation, the cells were harvested and DNA was extracted using ApopLadder Ex™ (TaKaRa, Shiga, Japan). The DNA samples were separated by electrophoresis on a 2% agarose gel and were visualized by ethidium bromide.
To determine the role of caspases or NOX in PI influx or DNA fragmentation in HT29 cells induced by E. histolytica, HT29 cells were pretreated with DMSO (0.5 or 1 %, v/v), pan-caspase inhibitor z-VAD-FMK (100 µM), or NOX inhibitor DPI (50 µM) for 30 min at 37℃ before being incubated with E. histolytica.
Measurement of intracellular ROS production in HT29 cells
Intracellular ROS accumulation in HT29 cells was measured by staining cells with the green fluorescence probe H2DCF-DA, which is rapidly oxidized to highly fluorescent DCF in the presence of intracellular H2O2, and was analyzed by flow cytometry. Briefly, HT29 cells (4×105 or 1×105 cells/sample, respectively) seeded in tissue culture plates were preloaded with 5 µM H2DCF-DA for 30 min and washed twice with culture medium. Washed cells were incubated with or without E. histolytica trophozoites at a ratio of 5:1 or 10:1 for up to 10 min at 37℃ in a CO2 incubator. Mean DCF fluorescence intensities of the amoeba-treated HT29 cells were compared with those of the non-treated control cells.
In addition, intracellular ROS accumulation in HT29 cells induced by amoebic trophozoites was confirmed by inverted fluorescence microscopy (×200). In particular, to clearly distinguish between live amoebae and HT29 cells, we added prestained amoebae with 10 µM SNARF-1 (red color) to the cell cultures. The production of intracellular ROS (green color) was observed under an inverted fluorescence microscopy.
Reverse transcription-PCR (RT-PCR)
Total RNA was obtained from HT29 cells using the TRI reagent (Molecular Research Center, Cincinnati, Ohio, USA) and was reverse-transcribed using ProSTAR first strand RT-PCR kit (Stratagene, La Jolla, California, USA). PCR was performed with specific primer sets for NOX1: NOX1, forward 5' ATGGGAAACTGGGTGGTTA-3' and reverse 5'-TAGCTGAAGTTACCATGAGAA-3'. Cycling conditions were as follows: 5 min at 95℃, followed by 35 cycles of 30 sec at 95℃, 30 sec at 60℃, and 30 sec at 72℃, with a final amplification for 7 min at 72℃. PCR products were examined on 2% agarose gels.
Knockdown of NOX1 and Rac1 in HT29 cells by siRNA
NOX1 siRNA, Rac1 siRNA, and the control siRNA were purchased from Dharmacon (Lafayette, Colorado, USA). In mock transfections, all reagents were used except for the siRNA. The siRNA cellular transfections were performed according to the manufacturer's instructions. To optimize the conditions of siRNA treatment, HT29 cells treated with 50 nM of siRNAs for varying periods of incubation (24, 48, or 72 hr) were examined. The cells were viable throughout the course of all experiments, as determined by trypan blue exclusion assays (data not shown). At 24, 48, and 72 hr post-transfection, the efficiency of siRNA-mediated knockdown of NOX1 or Rac1 was confirmed by western blotting using Ab to NOX1, Rac1 or β-actin as the loading control. At 48 hr post-transfection, the transfected HT29 cells were washed, placed in fresh cell culture medium, and co-incubated with E. histolytica for cell death assays.
Immunoblot analysis
HT29 cells (1×106 cells/sample), transfected with or without siRNAs, were lysed in lysis buffer (20 mM Tris-HCl, pH 7.5, 60 mM β-glycerophosphate, 10 mM EDTA, 10 mM MgCl2, 10 mM NaF, 2 mM dithiothreitol, 1 mM Na2VO4, 1 mM 4-amidinophenylmethane sulfonyl fluoride hydrochloride, 1% NP-40, and 5 µg/ml leupeptin) on ice for 30 min. Whole cell lysates were resolved in 10% SDS-PAGE gels, transferred to a membrane, and probed with specific antibodies to Rac1, NOX1, or β-actin at 4℃ overnight. The membranes were then soaked with horseradish-peroxidase (HRP)-conjugated anti-rabbit antibody at room temperature for 1 hr. Immunoreactivity was detected using LumiGLO (Cell Signaling Technology, Beverly, Massachusetts, USA).
Statistical analysis
Results are expressed as mean±SEM from at least three independent experiments. Statistical analyses were conducted using the Student's t-test. Values with P<0.05 were considered statistically significant.
Adherence of E. histolytica induced caspase-independent cell death in HT29 cells
E. histolytica-induced cell death in HT29 cells was determined through trypan blue, PI exclusion tests, or DNA fragmentation assays. As shown in Fig. 1A, when HT29 cells were incubated with E. histolytica trophozoites for 60 min at 10:1 and 5:1 ratios, the percentages of dead cells stained with trypan blue were 21.3% and 47.3%, respectively. In contrast, only 1.3% of cells incubated with medium alone were dead. Co-incubation of HT29 cells with E. histolytica at a ratio of 10:1 for 60 min resulted in the marked appearance of DNA laddering (Fig. 1B), which is a typical pattern for apoptotic cell death. Moreover, addition of 50 mM D-galactose remarkably retarded E. histolytica-induced nuclear DNA fragmentation in HT29 cells (Fig. 1B). The amoebic trophozoites themselves did not show laddering pattern (Fig. 1B). To assess whether caspase activation is involved in E. histolytica-induced HT29 cell death, HT29 cells pretreated with a pan-caspase inhibitor (z-VAD-FMK) were incubated with E. histolytica trophozoites for 60 min at 10:1 ratio. The pro-death effect of amoebae on PI influx or DNA fragmentation was not prevented by pretreatment with 100 µM z-VAD-FMK (Fig. 2A and B). To examine involvement of NOX-derived ROS in colon cell death induced by E. histolytica, we pretreated HT29 cells for 30 min with a NADPH oxidase inhibitor (DPI) prior to exposure to live trophozoites. Pretreatment with 50 µM DPI strongly retarded amoebic-induced DNA fragmentation in HT29 cells (Fig. 2B).
Incubation with E. histolytica induces DPI-sensitive intracellular ROS generation in HT29 cells
As shown in Fig. 3A, when using flow cytometer, mean fluorescence intensity (MFI) of DCF fluorescence in HT29 cells incubated with live trophozotes for 5 min at a 10:1 ratio was about 3.8-fold increased compared to results for cells incubated with medium alone. No DCF fluorescence was observed in amoebic trophozoites themselves (data not shown). As shown in Fig. 3B by inverted fluorescence microscopy, HT29 cells co-incubated with live amoebic trophozoites prestained with SNARF-1 (red fluorescence) showed strong ROS responses (green fluorescence) as compared to cells incubated with medium alone. In contrast, treatment with 50 µM DPI and 50 mM D-galactose almost completely abolished the generation of intracellular ROS in HT29 cells.
siRNA-mediated knockdown of Rac1 or NOX1 protein reduces E. histolytica-induced cell death in HT29 cells
Rac GTPase is an important activator of NOX1 [20]. To address the role of constitutive activity of Rac1 in E. histolytica-induced cell death, we designed small interference RNA (siRNA) to selectively knock down Rac1 protein levels. As shown in Fig. 4A, Rac1 siRNA efficiently (about 60%) inhibited the Rac1 protein expression in HT29 cells compared to siRNA control group. As shown in Fig. 4B, mock transfection in HT29 cells did not prevent Entamoeba-induced cell death. However, when transfected HT29 cells with Rac1 siRNA were incubated with E. histolytica, the percentage of dead cells stained with PI was reduced about 50% compared to that with control siRNA (Fig. 4B). We examined the gene expression of the catalytic subunits of NOX1 in colon cells. HT29 cells expressed NOX1 protein at high levels (Fig. 5A). As shown in Fig. 5A, compared to scrambled siRNA, either mRNA or protein expression for NOX1 was effectively suppressed in HT29 cells by transfection with 50 nM NOX1 siRNA. As shown in Fig. 5B, compared to control siRNA, NOX1 siRNA effectively inhibited E. histolytica-induced DNA fragmentation in HT29 cells.
We have demonstrated that NOX1-derived ROS participates in cell death of HT29 colon epithelial cells induced by E. histolytica. Amoeba-induced HT29 cell death was not inhibited by pretreatment with pan-caspase inhibitor. These results suggest that HT29 colon cells induced by amoebic trophozoites undergo to cell death in a caspase-independent mechanism. E. histolytica-induced cell death in HT29 cells was strongly inhibited by pretreatment with a NOX inhibitor, DPI. Indeed, mRNA and protein for NOX1 was found to be highly expressed in HT29 colon cells. Moreover, Rac1 protein, which is an important cytosolic factor for NOX1 activation [27], was highly expressed in HT29 cells. Suppression of Rac1 level by siRNA resulted in significant reduction of Entamoeba-induced cell death in HT29 cells. Furthermore, knockdown of NOX1 protein expression by specific siRNA prevented efficiently Entamoeba-induced DNA fragmentation in HT29 cells, suggesting that NADPH oxidase-derived ROS plays an important role in apoptotic cell death of colon epithelial cells induced by E. histolytica. All together, these results strongly suggest that NOX1 is required for ROS-mediated apoptotic cell death in HT29 colon cells induced by E. histolytica. Our in vitro finding can extend to in vivo scene that adherence of amoebic trophozoites to colon epithelial cells triggers the activation of NOX1 enzymes leading to ROS-dependent cell death, which can be a host defense mechanism to regulate acute inflammation during early phase of human amoebiasis.
Our previous report [18] has shown that ROS generation and caspase-3 works independently in the process of apoptosis in human neutrophils induced by E. histolytica, suggesting that there are two pro-death channels in human neutrophils for determination of apoptotic death in response to E. histolytica. However, when we used HT29 colon epithelial cells, a previous report has shown that calpain inhibitor or calpain siRNA reduced E. histolytica-induced cell death [21], suggesting that ROS as well as calpain may participate in the process of HT29 cell death. Although it is evident that calpain can regulate activation of caspase-3 in Jurkat T cells [8], pretreatment with a cell permeable calpain inhibitor, calpeptin, did not work to inhibit E. histolytica-induced cell death. These results suggest that signaling molecules involved in cell death induced by E. histolytica may vary in various immune cells.
In this study, we found that incubation with E. histolytica induced intracellular ROS generation and cell death in HT29 cells in a contact-dependent manner. Signaling interaction between amoebic Gal/GalNAc lectin and glycosylated receptors in host side may cause E. histolytica-induced host cell death [3]. Integrin is a typical adhesion molecule interacting with mammalian galectin [22]. Recently, we presented evidence that there might be a signaling association between β2 integrin on human neutrophils and amoebic galectin in E. histolytica-induced host cell apoptosis [5]. Moreover, it remains a possibility that amoebic galectin might directly associate with glycosylated residues of NOX2 since human NOX2 (gp91phox) is a glycosylated protein, and the carbohydrate chains are largely composed of N-acetylglucosamine and galactose [23]. A recent paper regarding on the lectin interaction to glycosylated residues of NOX2 supports our possibility [24]. Therefore, further studies to find out signaling interaction between amoebic gal-lectin and glycosylated receptors with high galactose side chains can lead to better understanding the secret of real parasitism in the view of tightly regulated signaling talk between host and amoeba in vivo.
A large number of studies about cell death of non-phagocytic cells via NOX activation have been documented [25,26]. In this study, by using both general NOX inhibitor DPI and siRNA for NOX1, we have demonstrated that ROS generated from NOX1 can contribute to E. histolytica-induced HT29 colon cell death. Our finding was consistent with our previous report on signaling involvement of NOX1-derived ROS in cell death of Caco2 colon epithelial cells induced by E. histolytica [19]. NOX1 is highly expressed in the colon epithelial cells [27] and its distribution increases from the ascending to descending colon segments, in parallel with the increased bacterial burden [28]. Therefore, NOX1 in colon epithelial cells could be activated during cell death in response to amoebic adhesion during early phase of the amebiasis. Among 7 NOX isoforms, NOX5, DUOX1 and DUOX2, which harbor calcium binding site EF-hands, are known to be activated by elevation of intracellular Ca2+ [29]. Indeed, NOX5-derived ROS has been reported to mediate cell death of prostatic tumor cell line stimulated with calcium ionophore A23187 [30]. Conversely, ROS has been reported to induce elevation of intracellular Ca2+ from intracellular storage [31]. Moreover, E. histolytica-induced host cell death can occur in a calcium- or ROS-dependent manner [18,32]. Therefore, deeper excavation regarding whether there is a cross talk between calcium and NOX-derived ROS, and whether calcium-dependent NOX5 can contribute to ROS-dependent host cell death induced by E. histolytica should be needed.
In conclusion, we show that NOX1-derived ROS, but not caspases, participates in cell death of HT29 colon epithelial cells induced by E. histolytica. This finding provides a clue to unveil the functional role of NOX1 in the context of human colon cell death leading to tissue pathology during early phase of human amebiasis.
This study was supported by the Korea Research Foundation Grant funded by the Korea Government (MOEHRD, Basic Research Promotion Fund) (KRF-2006-311-E00256).
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Fig. 1
Co-incubation with Entamoeba histolytica induces cell death in HT29 colon cells. (A) Percentage of dead cells in HT29 cells incubated with live trophozoites of E. histolytica. Data are presented as means±SEM from 5 independent experiments. Significant differences from controls are as follows. *P<0.05. (B) Addition of D-galactose inhibits DNA fragmentation in HT29 cells induced by E. histolytica. The figure is representative of 3 separate experiments showing similar results.
kjp-51-61-g001.jpg
Fig. 2
NOX-derived ROS, but not caspases are involved in cell death of HT29 cells induced by E. histolytica. (A) Effect of pan-caspase inhibitor z-VAD-fmk (100 µM) on PI influx in HT29 cells induced by E. histolytica. Data are presented as means±SEM from 4 independent experiments. (B) Effect of z-VAD-fmk or NADPH oxidase inhibitor (DPI) on E. histolytica-induced DNA fragmentation in HT29 cells. The figure is representative of 3 separate experiments showing similar results.
kjp-51-61-g002.jpg
Fig. 3
Incubation with live trophozoites of E. histolytica induces ROS generation in HT29 cells. (A) Incubation with E. histolytica induces ROS generation in HT29 cells. Data are presented as means±SEM from 3 independent experiments. Significant differences from controls are as follows; *P<0.05. (B) Visualization of intracellular ROS accumulation in HT29 cells adhered to live trophozoites of E. histolytica. The production of intracellular ROS in HT29 cells was observed by inverted fluorescence microscopy (×200).
kjp-51-61-g003.jpg
Fig. 4
Transfection with Rac1 siRNA inhibits E. histolytica-induced cell death in HT29 cells. (A) Analysis of Rac1 protein levels following Rac1 siRNA in HT29 cells. Blots are representative of 3 independent experiments. (B) Effect of Rac1 siRNA on PI influx in HT-29 cells induced by E. histolytica. Data are means±SD of 3 experiments done in triplicate. Significant differences from controls are as follows; *P<0.05.
kjp-51-61-g004.jpg
Fig. 5
Transfection with NOX1 siRNA inhibits E. histolytica-induced ROS generation and cell death in HT29 cells. (A) Analysis of rac1 gene or protein levels following NOX1 siRNA in HT29 cells. Blots are representative of 3 independent experiments. (B) Effect of NOX1 siRNA on E. histolytica-induced DNA fragmentation in HT29 cells. The figure is representative of 3 separate experiments showing similar results.
kjp-51-61-g005.jpg

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Entamoeba histolytica Induces Cell Death of HT29 Colonic Epithelial Cells via NOX1-Derived ROS
Korean J Parasitol. 2013;51(1):61-68.   Published online February 18, 2013
DOI: https://doi.org/10.3347/kjp.2013.51.1.61
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Entamoeba histolytica Induces Cell Death of HT29 Colonic Epithelial Cells via NOX1-Derived ROS
Korean J Parasitol. 2013;51(1):61-68.   Published online February 18, 2013
DOI: https://doi.org/10.3347/kjp.2013.51.1.61
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Entamoeba histolytica Induces Cell Death of HT29 Colonic Epithelial Cells via NOX1-Derived ROS
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Fig. 1 Co-incubation with Entamoeba histolytica induces cell death in HT29 colon cells. (A) Percentage of dead cells in HT29 cells incubated with live trophozoites of E. histolytica. Data are presented as means±SEM from 5 independent experiments. Significant differences from controls are as follows. *P<0.05. (B) Addition of D-galactose inhibits DNA fragmentation in HT29 cells induced by E. histolytica. The figure is representative of 3 separate experiments showing similar results.
Fig. 2 NOX-derived ROS, but not caspases are involved in cell death of HT29 cells induced by E. histolytica. (A) Effect of pan-caspase inhibitor z-VAD-fmk (100 µM) on PI influx in HT29 cells induced by E. histolytica. Data are presented as means±SEM from 4 independent experiments. (B) Effect of z-VAD-fmk or NADPH oxidase inhibitor (DPI) on E. histolytica-induced DNA fragmentation in HT29 cells. The figure is representative of 3 separate experiments showing similar results.
Fig. 3 Incubation with live trophozoites of E. histolytica induces ROS generation in HT29 cells. (A) Incubation with E. histolytica induces ROS generation in HT29 cells. Data are presented as means±SEM from 3 independent experiments. Significant differences from controls are as follows; *P<0.05. (B) Visualization of intracellular ROS accumulation in HT29 cells adhered to live trophozoites of E. histolytica. The production of intracellular ROS in HT29 cells was observed by inverted fluorescence microscopy (×200).
Fig. 4 Transfection with Rac1 siRNA inhibits E. histolytica-induced cell death in HT29 cells. (A) Analysis of Rac1 protein levels following Rac1 siRNA in HT29 cells. Blots are representative of 3 independent experiments. (B) Effect of Rac1 siRNA on PI influx in HT-29 cells induced by E. histolytica. Data are means±SD of 3 experiments done in triplicate. Significant differences from controls are as follows; *P<0.05.
Fig. 5 Transfection with NOX1 siRNA inhibits E. histolytica-induced ROS generation and cell death in HT29 cells. (A) Analysis of rac1 gene or protein levels following NOX1 siRNA in HT29 cells. Blots are representative of 3 independent experiments. (B) Effect of NOX1 siRNA on E. histolytica-induced DNA fragmentation in HT29 cells. The figure is representative of 3 separate experiments showing similar results.

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Entamoeba histolytica Induces Cell Death of HT29 Colonic Epithelial Cells via NOX1-Derived ROS
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