期刊
MUCOSAL IMMUNOLOGY
卷 4, 期 4, 页码 420-427出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/mi.2010.86
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资金
- NIH [DK-47322, DK-54495, AI-83027, AI-74438, AI-83539, DK-85898, DK-84063, AI-007051, GM-008361, RR-20136]
- Mucosal HIV and Immunobiology Center [DK-64400]
- Crohn's and Colitis Foundation of America
- Research Service of the Veterans Administration
Extracellular matrix (stroma) regulation of mucosal T-cell function is incompletely understood. In this study, we uncovered a role for intestinal stromal products in the innate regulation of effector T cells. Stroma-conditioned media (S-CM) derived from the normal human intestinal stroma (transforming growth factor-beta (TGF-beta)(hi)/interleukin (IL)-6(lo)/IL-1 beta(lo)) significantly downregulated T-cell proliferation and interferon-gamma (IFN-gamma) production compared with S-CM derived from the inflamed Crohn's mucosa (TGF-beta(hi)/IL-6(hi)/IL-1 beta(hi)). Antibody neutralization studies showed that TGF-beta in normal S-CM inhibited T-cell proliferation and IFN-gamma production, whereas IL-6 plus IL-1 beta in Crohn's S-CM promoted T-cell proliferation, and IL-1 beta alone promoted IFN-gamma and IL-17 release. Importantly, normal S-CM inhibited T-bet expression, whereas Crohn's S-CM activated signal transducer and activator of transcription 3, suggesting that discordant T-cell responses are regulated at the transcription factor and signaling levels. These findings implicate stromal TGF-beta in the downregulation of T-cell 2responses in the normal intestinal mucosa, and stromal IL-6 and IL-1 beta in the promotion of Th1 and Th17 responses in the inflamed Crohn's mucosa, suggesting an innate regulatory function for the intestinal extracellular matrix.
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