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Original Article

Efficient Liquid Media for Encystation of Pathogenic Free-Living Amoebae

Hae-Jin Sohn1, Heekyoung Kang1, Ga-Eun Seo1, Jong-Hyun Kim2, Suk-Yul Jung3, Ho-Joon Shin1,*
The Korean Journal of Parasitology 2017;55(3):233-238.
Published online: June 30, 2017

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*Corresponding author (hjshin@ajou.ac.kr)
• Received: February 15, 2017   • Revised: April 4, 2017   • Accepted: April 10, 2017

Copyright © 2017 by The Korean Society for Parasitology and Tropical Medicine

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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.
  • Key words: Naegleria fowleri, Acanthamoeba castellanii, Acanthamoeba polyphaga, encystation, encystment medium
Pathogenic free-living amoebae, Naegleria fowleri, Acanthamoeba castellanii, and Acanthamoeba polyphaga, are distributed worldwide, and are the known causative agents of primary amoebic meningoencephalitis (PAM) or acanthamoebic keratitis (AK) in humans, respectively [1]. PAM cases are associated with recreational activities in freshwater, whereas AK cases have become a concern in people wearing contact lenses. The ubiquitous distribution in nature of these free-living amoebae shows 2 distinct forms in their life-cycle: trophozoites and cysts (sometimes flagellate in Naegleria). In unfavorable environments, such as exhausted food supply, desiccation, and low temperature, amoebic trophozoites are known to undergo encystation. The cysts are characterized by a round shape and the presence of 2 cyst walls (endo- and ectocyst), especially distinct in the wrinkled ectocyst in Acanthamoeba spp. [2]. The encystation is an important event for the survival, resistance, and ability of disease induction of these free-living amoebae [3–6].
Until recently, a useful method of N. fowleri encystation was the use of solid non-nutrient agar medium supplied with heat-inactivated Escherichia coli. The solid medium has a limitation for cultivation and harvesting axenic and massive amoebic cysts. Current studies in Naegleria infection indicate that the encystation of N. fowleri trophozoites is required to study the pathophysiology, pathogenic mechanisms, immunology, and genomics. On the other hand, since a defined liquid media for the encystment of Acanthamoeba spp. has been established [6], many researchers have lately applied acanthamoebic encystation with a little modification [7–10].
To obtain a large amount of pure N. fowleri cysts (or precysts), a liquid encystment medium modified from Page’s amoeba saline [1] was applied on encystation of N. fowleri trophozoites. In addition, the efficient usage of 2 liquid encystment media generally used for the cyst formation of Acanthamoeba spp. [6,11] was compared.
Free-living amoebae cultivation
Trophozoites of N. fowleri (Cater NF69 strain, ATCC No. 30215, Manassas, Virginia, USA) were axenically cultured at 37°C in Nelson’s medium containing 10% fetal bovine serum [12], and A. castellanii and A. polyphaga were axenically cultured at 30°C in PYG medium [13].
Encystation of free-living amoebae
Cysts or precysts (did not fully showed the 2-distinct cyst walls) of N. fowleri, A. castellanii, and A. polyphaga were induced by cultivating on 3 kinds of encystment media (buffer 1: 120 mM NaCl, 0.03 mM MgCl2, 1 mM NaHPO4, 1 mM KH2 PO4, 0.03 mM CaCl2, 0.02 mM FeCl2, H 6.8; buffer 2 [11]: 95 mM NaCl, 5 mM KCl, 8 mM MgSO4, 0.4 mM CaCl2, 1 mM NaHCO3, 20 mM Tris-HCl, pH 9.0; buffer 3 [6]: 100 mM KCl, 8 mM MgSO4, 0.4 mM CaCl2, 20 mM 2-amino-2-methyl-1,3-propanediol, pH 7.6) (Table 1). Amoebic trophozoties (approximately 2×106 cells) were washed with PBS (pH 7.4) twice, and incubated in 24-well plates with 5 ml of each medium, at 30°C or 37°C. Using an optical microscope (Olympus, Shinjuku, Tokyo, Japan), the morphological changes were observed after encystation, and final cysts were re-cultured with fresh Nelson or PYG media, in order to observe the recovered trophozoites.
Differential mRNA expression from trophozoites and cysts of free-living amoebae
Total RNA from trophozoites and cysts (or precysts) of N. fowleri, A. castellanii, and A. polyphaga were prepared using an isolation kit Rnasymini kit (QIAGEN, Hilden, Germany); cDNAs were synthesized from 10 μg of total RNA using cDNA Synthesis kit (Invitrogen, Carlsbad, California, USA). RT-PCR was performed using specific primer for nfa1 and nf-actin genes for Naegleria, and actin and atg8 genes for Acanthamoeba [5,14, 15]. The reference genes were the p3 gene (N. fowleri-specific chromosomal DNA sequence; forward 5′GCTATCGAATGGATTCAAGC and reverse 5′CACTACTCGTGGAAGGCTTA) and 18S rRNA gene [5]. PCR condition was 95°C for 5 min, 30 cycles at 95°C for 1 min, 50–55°C for 1 min, 72°C for 1 min, and final extension for 10 min at 72°C.
Morphological observation of encysted amoebae
Trophozoites of N. fowleri cultured with buffer 1 showed the rounding morphological change at 6 hr, and precysts and cysts were observed at 24 hr. After 48 hr cultivation, a large proportion of N. fowleri trophozoites were encysted (Fig. 1). On culturing the N. fowleri trophozoites in buffer 2, the morphological changes (such as rounding), precysts and cysts were induced later than seen in buffer 1 (Fig. 1). On all occasions, the induced precysts and cysts at 48 hr were recovered into active trophozoites in fresh Nelson’s medium (Fig. 1). As a control group, N. fowleri trophozoites cultured in distilled water (DW) did not encyst fully. In addition, when they were incubated with staurosporine, a reagent known to induce cell-death, N. fowleri trophozoites transformed to their round forms, but live trophozoites could not be recovered in Nelson’s medium (Fig. 1).
Trophozoites A. castellanii cultured with buffer 2 and 3 showed rounding at day 1, and precysts and cysts were well observed at day 2. After cultivation for 3 days, a large proportion of A. castellanii trophozoites were encysted (Fig. 2). Culturing A. castellanii trophozoites in buffer 2, the induction of precysts and cysts was better than those of buffer 3 (Fig. 2). On all occasions, induced precysts and cysts for 3 days recovered into active trophozoites in fresh PYG medium (Fig. 2). Furthermore, A. castellanii trophozoites cultured with buffer 1 (shown the well encystation in the case of N. fowleri) did not encyst fully (Fig. 2). When encystation was continued for 7 days, similar results were observed, although the number of cysts decreased in accordance with incubation periods (data not shown). In addition, in the case of A. polyphaga, the encystation results were similar to those of A. castellanii (Fig. 3).
Differential mRNA expression in trophozoites and cysts of amoebae
In the results of differential mRNA expression between trophozoites and cysts (precyst) of N. fowleri, the nfa1 gene was highly expressed in the trophozoites (Fig. 4). In addition, the nf-actin gene on trophozoites was also more expressed than in cysts (Fig. 4). In the differential mRNA expression of acanthamoebic actin gene, over-expression was observed in trophozoites of A. castellanii and A. polyphaga (Fig. 5). In contrast, the atg8 gene which is associated with cyst formation in Acanthamoeba spp. [11] was expressed more in cysts (Fig. 5).
N. fowleri, known as “brain-eating amoeba”, causes acute PAM in children and young adults with a history of diving in freshwater and recreational activities in amoebae-contaminated water in the hot summer [2,16]. In these latter days, death due to PAM is rearing its ugly head as a Neglected Tropical Disease (NTD) in countries of Asia, such as India, Pakistan, Taiwan, Thailand, and Vietnam [17]. In addition, the AK human case from contact lens wearers has been increasing worldwide [18].
In recent many studies on free-living amoebae, such as N. fowleri and A. castellanii, the encystation of amoebic trophozoite is required to study the pathophysiology, pathogenic mechanisms, immunology, and genomics. For the amoebic encystment of Acanthamoeba spp., in previous studies, a defined and slightly modified liquid media has been used [6,9,10]. In N. fowleri encystation, however, the solid non-nutrient agar medium supplemented with heat-inactivated E. coli has been used, in spite of the possible contamination of E. coli proteins and smaller numbers of harvested cysts [4,19,20].
In this study, to obtain a large amount of pure N. fowleri cysts (or precysts), a liquid encystment medium modified from Page’s amoeba saline (named as the encystmemt buffer 1) was applied on N. fowleri encystation. As the results of N. fowleri encystation with buffer 1, amoebic cysts were well induced at 48 hr post incubation. And then, the induced cysts at 48 hr were well recovered into active trophozoites in fresh Nelson’s medium. In addition, the above morphological encystation was confirmed by observing the differential mRNA expression of the pseudopodia-specific nfa1 gene [14] and the nf-actin gene [15] between trophozoites and cysts of N. fowleri. On the present results, the nfa1 and nf-actin gene on trophozoites was also more expressed than in cysts. These results proved the encystation of N. fowleri trophozoites. Thus, the present method used a liquid encystment medium may replace the previous method of N. fowleri encystation used a solid non-nutrient agar medium with heat-inactivated E. coli.
On the morphological findings of Acanthamoeba encystation, buffer 2 (modified to pH 9.0) was also a more effective agent in this study, which was mainly used for many studies [6,8,9,11]. In addition, the present results were confirmed by the differential mRNA expression between trophzoites and cysts. The over-expression of actin gene was observed in trophozoites of A. castellanii and A. polyphaga. In contrast, the atg8 gene was expressed more in cysts, as which is associated with cyst formation in Acanthamoeba spp. [11]. The above results indicate that buffer 2 is better for the encystation of A. castellanii and A. polyphaga trophozoites.
Finally, 2 liquid encystment media, buffer 1 for Naegleria and buffer 2 for Acanthamoeba may be useful for further studies which require axenic and pure amoebic cysts.

CONFLICT OF INTEREST

We have no conflict of interest related to this study.

This research was supported by a Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, the Republic of Korea (no. 2015R1D1A1A01056862).
Fig. 1
Morphological changes of N. fowleri trophozoites into precysts (or cysts) cultured with encystation media for 6, 24, and 48 hr. Buffer 1 is an effective medium. Staurosporine induced rounding, but trophozoites were not recovered in Nelson’s medium.
kjp-55-3-233f1.gif
Fig. 2
Morphological changes of A. castellanii trophozoites into precysts (or cysts) cultured in encystation media for 1, 2, and 3 days. The effective medium is buffer 2. Cysts recovered to trophozoites in PYG medium. Arrows indicate mature cysts.
kjp-55-3-233f2.gif
Fig. 3
Morphological changes of A. polyphaga trophozoites into precysts (or cysts) cultured in encystation media for 1, 2, and 3 days. Buffer 2 is an effective medium. Cysts recovered to trophozoites in PYG medium.
kjp-55-3-233f3.gif
Fig. 4
The mRNA expressions of nfa1 and nf-actin genes on N. fowleri trophozoites (Troph), precyts, and cysts (PreC) at 48 hr post cultivation with buffer 1. The p3 mRNA expression is used as the control.
kjp-55-3-233f4.gif
Fig. 5
The mRNA expressions of actin and atg8 genes on A. castellanii (A) and A. polyphaga (B) trophozoites, precysts and cysts. The 18S rRNA mRNA expression is used as the control.
kjp-55-3-233f5.gif
Table 1
Compositions of encystation media for Naegleria (buffer 1), Acanthamoeba spp. (buffers 2 and 3), and Page’s amoeba saline
Table 1
Buffer 1. Naegleria Encystment media (pH6.8)
 120 mM NaCI
 0.03 mM MgCI4
 1 mM Na2HPO4
 1 mM KH2PO4
 0.03 mM CaCI2
 0.02 mM FeCI2
Buffer 2. Acanthamoeba Encystment media (pH9.0)
 95 mM NaCI
 5 mM KCI
 8 mM MgSO4
 1 mM NaHCO3
 0.4 mM CaCI2
 20 mM Tris-CI (Ph9.0)
Buffer 3. Acanthamoeba Encystment media (pH7.6)
 0.1 mM KCI
 8 mM MgSO4
 0.4 mM CaCI2
 20 mM 2-amino-2-methlyl-1, 3-propanediol
Page’s amoeba saline (pH6.8–7.9)
 2 mM NaCI
 0.03 mM MgSO4
 0.03 mM CaCI2
 1 mM Na2HPO4
 1 mM KH2PO4
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Efficient Liquid Media for Encystation of Pathogenic Free-Living Amoebae
Korean J Parasitol. 2017;55(3):233-238.   Published online June 30, 2017
DOI: https://doi.org/10.3347/kjp.2017.55.3.233
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Efficient Liquid Media for Encystation of Pathogenic Free-Living Amoebae
Korean J Parasitol. 2017;55(3):233-238.   Published online June 30, 2017
DOI: https://doi.org/10.3347/kjp.2017.55.3.233
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Efficient Liquid Media for Encystation of Pathogenic Free-Living Amoebae
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Fig. 1 Morphological changes of N. fowleri trophozoites into precysts (or cysts) cultured with encystation media for 6, 24, and 48 hr. Buffer 1 is an effective medium. Staurosporine induced rounding, but trophozoites were not recovered in Nelson’s medium.
Fig. 2 Morphological changes of A. castellanii trophozoites into precysts (or cysts) cultured in encystation media for 1, 2, and 3 days. The effective medium is buffer 2. Cysts recovered to trophozoites in PYG medium. Arrows indicate mature cysts.
Fig. 3 Morphological changes of A. polyphaga trophozoites into precysts (or cysts) cultured in encystation media for 1, 2, and 3 days. Buffer 2 is an effective medium. Cysts recovered to trophozoites in PYG medium.
Fig. 4 The mRNA expressions of nfa1 and nf-actin genes on N. fowleri trophozoites (Troph), precyts, and cysts (PreC) at 48 hr post cultivation with buffer 1. The p3 mRNA expression is used as the control.
Fig. 5 The mRNA expressions of actin and atg8 genes on A. castellanii (A) and A. polyphaga (B) trophozoites, precysts and cysts. The 18S rRNA mRNA expression is used as the control.

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Efficient Liquid Media for Encystation of Pathogenic Free-Living Amoebae

Compositions of encystation media for Naegleria (buffer 1), Acanthamoeba spp. (buffers 2 and 3), and Page’s amoeba saline

Buffer 1. Naegleria Encystment media (pH6.8)
 120 mM NaCI
 0.03 mM MgCI4
 1 mM Na2HPO4
 1 mM KH2PO4
 0.03 mM CaCI2
 0.02 mM FeCI2
Buffer 2. Acanthamoeba Encystment media (pH9.0)
 95 mM NaCI
 5 mM KCI
 8 mM MgSO4
 1 mM NaHCO3
 0.4 mM CaCI2
 20 mM Tris-CI (Ph9.0)
Buffer 3. Acanthamoeba Encystment media (pH7.6)
 0.1 mM KCI
 8 mM MgSO4
 0.4 mM CaCI2
 20 mM 2-amino-2-methlyl-1, 3-propanediol
Page’s amoeba saline (pH6.8–7.9)
 2 mM NaCI
 0.03 mM MgSO4
 0.03 mM CaCI2
 1 mM Na2HPO4
 1 mM KH2PO4
Table 1 Compositions of encystation media for Naegleria (buffer 1), Acanthamoeba spp. (buffers 2 and 3), and Page’s amoeba saline

Table 1

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