Response of cell lines to actual and simulated inoculation with Cryptosporidium proliferans

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Authors

MELICHEROVÁ Janka HOFMANNOVÁ Lada BARDŮNEK VALIGUROVÁ Andrea

Year of publication 2018
Type Article in Periodical
Magazine / Source European Journal of Protistology
MU Faculty or unit

Faculty of Science

Citation
Web https://doi.org/10.1016/j.ejop.2017.12.003
Doi http://dx.doi.org/10.1016/j.ejop.2017.12.003
Keywords Antigen; Apicomplexa; Cryptosporidium muris; Cryptosporidium proliferans; Encapsulation; Invasion
Description The need for an effective treatment against cryptosporidiosis has triggered studies in the search for a working in vitro model. The peculiar niche of cryptosporidia at the brush border of host epithelial cells has been the subject of extensive debates. Despite extensive research on the invasion process, it remains enigmatic whether cryptosporidian host-parasite interactions result from an active invasion process or through encapsulation. We used HCT-8 and HT-29 cell lines for in vitro cultivation of the gastric parasite Cryptosporidium proliferans strain TS03. Using electron and confocal laser scanning microscopy, observations were carried out after 24, 48 and 72 h after inoculation with a mixture of C. proliferans oocysts and sporozoites. Free sporozoites and putative merozoites were observed apparently searching for an appropriate infection site. Advanced stages, corresponding to trophozoites and meronts/gamonts enveloped by parasitophorous sac, and emptied sacs were detected. As our observations showed that even unexcysted oocysts became enveloped by cultured cell projections, using polystyrene microspheres, we evaluated the response of cell lines to simulated inoculation with cryptosporidian oocysts to verify innate and parasite-induced behaviour. We found that cultured cell encapsulation of oocysts is induced by parasite antigens, independent of any active invasion/motility.
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