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http://dx.doi.org/10.3347/kjp.2022.60.4.241

Development of Toxoplasma gondii Chinese I genotype Wh6 Strain in Cat Intestinal Epithelial Cells  

Zhao, Guihua (Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences)
Zhang, Lixin (Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences)
Dai, Lisha (Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences)
Xu, Haozhi (Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences)
Xu, Chao (Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences)
Xiao, Ting (Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences)
Li, Jin (Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences)
Sun, Hui (Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences)
Zhou, Beibei (Jining Blood Center)
Yin, Kun (Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences)
Publication Information
Parasites, Hosts and Diseases / v.60, no.4, 2022 , pp. 241-246 More about this Journal
Abstract
Felids are the unique definitive host of Toxoplasma gondii. The intestine of felid is the only site for initiating Toxoplasma gondii sexual reproduction. T. gondii excretes millions of infectious oocysts from the intestine, which are the primary source of infection. There are many difficulties in developing vaccines and drugs to control oocyst excretion due to the lack of an appropriate experimental model. Here, we established an in vitro feline intestinal epithelial cell (IEC) infection system and an efficient animal model of T. gondii Chinese 1 genotype, Wh6 strain (TgCtwh6). The Kunming mice brain tissues containing TgCtwh6 cysts were harvested 42-day post-infection. The bradyzoites were co-cultured with cat IECs in vitro at a ratio of 1:10. Five 3-month-old domestic cats were orally inoculated with 600 cysts each. The oocysts were detected by daily observation of cat feces by microscopy and polymerase chain reaction. We found that the parasite adhered and invaded cat IECs in vitro, transformed into tachyzoites, and then divided to form rose-like structures. These parasites eventually destroyed host cells, escaped, and finished the asexual reproduction process. Schizonts associated with sexual reproduction have not been observed during development in vitro cultured cells. However, schizonts were detected in all infected cat intestinal epithelial cells, and oocysts were presented in all cat feces. Our study provides a feasible cell model and an efficient infection system for the following studies of T. gondii sexual reproduction, and also lays a foundation to develop drugs and vaccines for blocking excretion and transmission of oocysts.
Keywords
Toxoplasma gondii; cat intestinal epithelial cell; development; oocyst excretion; Chinese 1 genotype Wh6 strain;
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