T cell-intrinsic and -extrinsic contributions of the IFNAR/STAT1-axis to thymocyte survival |
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Authors: | Moro Hiroshi Otero Dennis C Tanabe Yoshinari David Michael |
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Affiliation: | Division of Biological Sciences and UCSD Cancer Center, University of California San Diego, La Jolla, California, United States of America. |
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Abstract: | STAT1 is an essential part of interferon signaling, and STAT1-deficiency results in heightened susceptibility to infections or autoimmunity in both mice and humans. Here we report that mice lacking the IFNα/β-receptor (IFNAR1) or STAT1 display impaired deletion of autoreactive CD4(+)CD8(+)-T-cells. Strikingly, co-existence of WT T cells restored thymic elimination of self-reactive STAT1-deficient CD4(+)CD8(+)-T cells. Analysis of STAT1-deficient thymocytes further revealed reduced Bim expression, which was restored in the presence of WT T cells. These results indicate that type I interferons and STAT1 play an important role in the survival of MHC class I-restricted T cells in a T cell intrinsic and non-cell intrinsic manner that involves regulation of Bim expression through feedback provided by mature STAT1-competent T cells. |
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