Journal
JOURNAL OF LEUKOCYTE BIOLOGY
Volume 97, Issue 3, Pages 477-485Publisher
OXFORD UNIV PRESS
DOI: 10.1189/jlb.1RI0614-293R
Keywords
pathway crosstalk; signal rheostat; proliferation; homeostasis; effector function
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Funding
- U.S. National Institutes of Health [AI073955, AI108958]
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T cell development, differentiation, and maintenance are orchestrated by 2 key signaling axes: the antigen-specific TCR and cytokine-mediated signals. The TCR signals the recognition of self- and foreign antigens to control T cell homeostasis for immune tolerance and immunity, which is regulated by a variety of cytokines to determine T cell subset homeostasis and differentiation. TCR signaling can synergize with or antagonize cytokine-mediated signaling to fine tune T cell fate; however, the latter is less investigated. Murine models with attenuated TCR signaling strength have revealed that TCR signaling can function as regulatory feedback machinery for T cell homeostasis and differentiation in differential cytokine milieus, such as IL-2-mediated T-reg development; IL-7-mediated, naive CD8(+) T cell homeostasis; and IL-4induced innate memory CD8(+) T cell development. In this review, we discuss the symphonic cross-talk between TCR and cytokine-mediated responses that differentially control T cell behavior, with a focus on the negative tuning by TCR activation on the cytokine effects.
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