Linked Life Data

7515100

Source:http://linkedlifedata.com/resource/pubmed/id/7515100

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pubmed-article:7515100pubmed:abstractTextThe proliferation of antigen-activated T cells is mediated by the T cell-derived growth factor, interleukin 2 (IL-2). The biochemical signaling cascades initiating IL-2-induced growth are dependent upon protein tyrosine kinase (PTK) activity. One IL-2-regulated PTK implicated in this cascade is the Src-family kinase, Fyn. Previous studies have described a physical association between Fyn and a potential downstream substrate, phosphatidylinositol 3-kinase (PI3-kinase) as well as the IL-2-dependent activation of PI3-kinase in T cells; however, the role of Fyn in IL-2-induced PI3-kinase activation remains unclear. In this report, we demonstrate that IL-2 stimulation triggers tyrosine phosphorylation of the p85 subunit of PI3-kinase in the murine T cell line, CTLL-2. Lysates prepared from growth factor-deprived and IL-2-stimulated T cells reconstituted both the binding of CTLL-2 cell-derived Fyn to and the IL-2-inducible tyrosine phosphorylation of exogenously added recombinant p85. Furthermore, overexpression of wild-type Fyn in these cells enhanced both the basal and IL-2-mediated activation of PI3-kinase. Additional studies of the Fyn-PI3-kinase interaction demonstrated that the Src homology 3 (SH3) domain of Fyn constitutes a direct binding site for the p85 subunit of PI3-kinase. These results support the notion that Fyn may be directly involved in the activation of the downstream signaling enzyme, PI3-kinase, in IL-2-stimulated T cells.lld:pubmed
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pubmed-article:7515100pubmed:issn0022-1007lld:pubmed
pubmed-article:7515100pubmed:authorpubmed-author:AbrahamR TRTlld:pubmed
pubmed-article:7515100pubmed:authorpubmed-author:KarnitzL MLMlld:pubmed
pubmed-article:7515100pubmed:authorpubmed-author:SutorS LSLlld:pubmed
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pubmed-article:7515100pubmed:dateRevised2010-11-18lld:pubmed
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