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- W2068421138 abstract "Src is activated in response to a variety of growth factors and hormones that bind G protein-coupled receptors (GPCRs), and its activity is regulated by phosphorylation at key sites, including the autophosphorylation site Tyr-418 and the inhibitory site Tyr-529. To better understand the mechanisms controlling Src activation, we examined Src phosphorylation in Swiss 3T3 fibroblasts stimulated with bombesin and in IEC-18 intestinal epithelial cells stimulated with angiotensin II (Ang II). Phosphorylation at Src Tyr-418, the activation loop site, was rapidly and markedly increased after GPCR agonist addition in both cell types. However, treatment of intact cells with the selective Src family kinase inhibitor PP2, at concentrations which abolished Src-mediated phosphorylation of focal adhesion kinase (FAK) at Tyr-577, unexpectedly led to increased phosphorylation at Src Tyr-418 and diminished phosphorylation at Tyr-529. In Swiss 3T3 cells, PP2 enhanced Tyr-418 phosphorylation after 1 min of bombesin stimulation, while in IEC-18 cells, PP2 increased Ang II-stimulated Tyr-418 phosphorylation at all times tested. These results imply that a distinct, non-Src family kinase may be responsible for phosphorylating Src at Tyr-418 in intact fibroblasts and epithelial cells stimulated by GPCR agonists." @default.
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- W2068421138 date "2005-01-01" @default.
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- W2068421138 title "Bombesin and angiotensin II rapidly stimulate Src phosphorylation at Tyr-418 in fibroblasts and intestinal epithelial cells through a PP2-insensitive pathway" @default.
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- W2068421138 doi "https://doi.org/10.1016/j.cellsig.2004.06.001" @default.
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