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Plac8-dependent and inducible NO synthase-dependent mechanisms clear Chlamydia muridarum infections from the genital tract.

J. Immunol.2012 Feb 15;188(4):1896-904. Epub 2012 Jan 11
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摘要


Chlamydia trachomatis urogenital serovars replicate predominantly in genital tract epithelium. This tissue tropism poses a unique challenge for host defense and vaccine development. Studies utilizing the Chlamydia muridarum mouse model have shown that CD4 T cells are critical for clearing genital tract infections. In vitro studies have shown that CD4 T cells terminate infection by upregulating epithelial inducible NO synthase (iNOS) transcription and NO production. However, this mechanism is not critical, as iNOS-deficient mice clear infections normally. We recently showed that a subset of Chlamydia-specific CD4 T cell clones could terminate replication in epithelial cells using an iNOS-independent mechanism requiring T cell degranulation. We advance that work using microarrays to compare iNOS-dependent and iNOS-independent CD4 T cell clones. Plac8 was differentially expressed by clones having the iNOS-independent mechanism. Plac8-deficient mice had delayed clearance of infection, and Plac8-deficient mice treated with the iNOS inhibitor N-monomethyl-l-arginine were largely unable to resolve genital tract infections over 8 wk. These results demonstrate that there are two independent and redundant T cell mechanisms for clearing C. muridarum genital tract infections: one dependent on iNOS, and the other dependent on Plac8. Although T cell subsets are routinely defined by cytokine profiles, there may be important subdivisions by effector function, in this case CD4(Plac8).

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