Journal
MICROBES AND INFECTION
Volume 20, Issue 4, Pages 261-266Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micinf.2017.12.004
Keywords
Toxoplasma gondii; Cyst; Inducible nitric oxide synthase; Phagolysosome; CD8(+) T cells
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Funding
- NIH [AI095032, AI078756]
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Significantly larger numbers of Toxoplasma gondii cysts were detected in the brains of RAG1(-/-)NOS2(-/-) than RAG1(-/-) mice following infection. In contrast, the cyst numbers markedly decreased in a same manner in both strains of mice after receiving CD8(+) immune T cells. Thus, NOS2-mediated innate immunity is important for inhibiting formation of cysts in the brain but not required for the T cell-initiated cyst removal, which is associated with phagocyte accumulation. Treatment with chloroquine, an inhibitor of endolysosomal acidification, partially but significantly inhibited the T cell-mediated cyst removal, suggesting that phagosome-lysosome fusion could be involved in the T. gondii cyst elimination. (C) 2017 Institut Pasteur. Published by Elsevier Masson SAS. All rights reserved.
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