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- W1997041961 abstract "ABSTRACT The apical membrane antigen 1 (AMA1) protein was believed to be essential for the perpetuation of two Apicomplexa parasite genera, Plasmodium and Toxoplasma , until we genetically engineered viable parasites lacking AMA1 . The reduction in invasiveness of the Toxoplasma gondii RH-AMA1 knockout (RH-AMA1 KO ) tachyzoite population, in vitro , raised key questions about the outcome associated with these tachyzoites once inoculated in the peritoneal cavity of mice. In this study, we used AMNIS technology to simultaneously quantify and image the parasitic process driven by AMA1 KO tachyzoites. We report their ability to colonize and multiply in mesothelial cells and in both resident and recruited leukocytes. While the RH-AMA1 KO population amplification is rapidly lethal in immunocompromised mice, it is controlled in immunocompetent hosts, where immune cells in combination sense parasites and secrete proinflammatory cytokines. This innate response further leads to a long-lasting status immunoprotective against a secondary challenge by high inocula of the homologous type I or a distinct type II T. gondii genotypes. While AMA1 is definitively not an essential protein for tachyzoite entry and multiplication in host cells, it clearly assists the expansion of parasite population in vivo ." @default.
- W1997041961 created "2016-06-24" @default.
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- W1997041961 date "2015-06-01" @default.
- W1997041961 modified "2023-09-30" @default.
- W1997041961 title "AMA1-Deficient Toxoplasma gondii Parasites Transiently Colonize Mice and Trigger an Innate Immune Response That Leads to Long-Lasting Protective Immunity" @default.
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- W1997041961 doi "https://doi.org/10.1128/iai.02606-14" @default.
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