[HTML][HTML] Transforming growth factor-β controls development, homeostasis, and tolerance of T cells by regulatory T cell-dependent and-independent mechanisms

MO Li, S Sanjabi, RA Flavell - Immunity, 2006 - cell.com
Immunity, 2006cell.com
The role of transforming growth factor-β (TGF-β) in inhibiting T cell functions has been
studied with dominant-negative TGF-β receptor transgenic models; however, the full impact
of TGF-β signaling on T cells and the mechanisms by which TGF-β signals remain poorly
understood. Here we show that mice with T cell-specific deletion of TGF-β receptor II
developed lethal inflammation associated with T cell activation and differentiation. In
addition, TGF-β signaling positively regulated T cell development and homeostasis …
Summary
The role of transforming growth factor-β (TGF-β) in inhibiting T cell functions has been studied with dominant-negative TGF-β receptor transgenic models; however, the full impact of TGF-β signaling on T cells and the mechanisms by which TGF-β signals remain poorly understood. Here we show that mice with T cell-specific deletion of TGF-β receptor II developed lethal inflammation associated with T cell activation and differentiation. In addition, TGF-β signaling positively regulated T cell development and homeostasis. Development of CD8+ T cells and NKT cells, maintenance of peripheral Foxp3-expressing regulatory T cells, and survival of CD4+ T cells all depended on TGF-β signaling. Both T helper 1 (Th1) differentiation and survival of activated CD4+ T cells required T-bet, the TGF-β-regulated transcription factor, which controlled CD122 expression and IL-15 signaling in Th1 cells. This study reveals pleiotropic functions of TGF-β signaling in T cells that may ensure a diverse and self-tolerant T cell repertoire in vivo.
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