4.6 Article

T-bet-independent Th1 response induces intestinal immunopathology during Toxoplasma gondii infection

Journal

MUCOSAL IMMUNOLOGY
Volume 11, Issue 3, Pages 921-931

Publisher

NATURE PUBLISHING GROUP
DOI: 10.1038/mi.2017.102

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Funding

  1. NIAID [R56AI085263, R01AI121090]
  2. Burroughs Wellcome Foundation

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Coordinated production of IFN-gamma by innate and adaptive immune cells is central for host defense, but can also trigger immunopathology. The investigation of the lymphoid cell-specific contribution to the IFN-gamma-mediated intestinal pathology during Toxoplasma gondii infection identified CD4+ T cells as a key cell population responsible for IFN-gamma-dependent intestinal inflammation and Paneth cell loss, where T-bet-dependent group 1 innate lymphoid cells have a minor role in driving the parasite-induced immunopathology. This was evident from the analysis of T-bet deficiency that did not prevent the intestinal inflammation and instead revealed that T-bet-deficient CD4thorn Th1 cells are sufficient for T. gondii-triggered acute ileitis and Paneth cell loss. These results revealed that T-bet-independent Th1 effector cells are major functional mediators of the type I immunopathological response during acute gastrointestinal infection.

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