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Interferon-gamma-responsive Nonhematopoietic Cells Regulate the Immune Response to Mycobacterium Tuberculosis

Overview
Journal Immunity
Publisher Cell Press
Date 2010 Jan 13
PMID 20064452
Citations 142
Authors
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Abstract

Immunity to Mycobacterium tuberculosis in humans and in mice requires interferon gamma (IFN-gamma). Whereas IFN-gamma has been studied extensively for its effects on macrophages in tuberculosis, we determined that protective immunity to tuberculosis also requires IFN-gamma-responsive nonhematopoietic cells. Bone marrow chimeric mice with IFN-gamma-unresponsive lung epithelial and endothelial cells exhibited earlier mortality and higher bacterial burdens than control mice, underexpressed indoleamine-2,3-dioxygenase (Ido1) in lung endothelium and epithelium, and overexpressed interleukin-17 (IL-17) with massive neutrophilic inflammation in the lungs. We also found that the products of IDO catabolism of tryptophan selectively inhibit IL-17 production by Th17 cells, by inhibiting the action of IL-23. These results reveal a previously unsuspected role for IFN-gamma responsiveness in nonhematopoietic cells in regulation of immunity to M. tuberculosis and illustrate the role of IDO in the inhibition of Th17 cell responses.

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