TGF-beta inhibits IL-2-induced tyrosine phosphorylation and activation of Jak-1 and Stat 5 in T lymphocytes - PubMed (original) (raw)
. 1997 Jul 1;159(1):175-83.
Affiliations
- PMID: 9200453
TGF-beta inhibits IL-2-induced tyrosine phosphorylation and activation of Jak-1 and Stat 5 in T lymphocytes
J J Bright et al. J Immunol. 1997.
Abstract
Signaling through IL-2R, IL-2 induces tyrosine phosphorylation and activation of Jak-1 and Jak-3 kinases and Stat 3 and Stat 5 transcription factors leading to cell cycle progression of activated T cells from G1 to S phase. TGF-beta is an immunosuppressive cytokine, which inhibits T cell proliferation at G1 to S phase transition. We examined the effect of TGF-beta on IL-2R signal transduction pathway in activated T cells. We show here that treatment of activated T cells with TGF-beta inhibited IL-2-induced tyrosine phosphorylation and activation of Jak-1 and Stat 5 but not Jak-3 and Stat 3. TGF-beta also inhibited IL-2-induced expression of alpha- and beta-chains of IL-2R and induced apoptotic cell death in T cells. These results suggest that TGF-beta-induced growth arrest and apoptosis are associated with the modulation of IL-2-induced activation of Jak-Stat pathway in T cells.
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