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- W2076662006 abstract "We recently reported that sphingosylphosphorylcholine (SPC) is a novel messenger for Rho-kinase-mediated Ca(2+) sensitization of vascular smooth muscle (VSM) contraction. Subcellular localization and kinase activity of Src family protein kinases (SrcPTKs), except for c-Src, is controlled by a reversible S-palmitoylation, an event inhibited by eicosapentaenoic acid (EPA). We examined the possible involvement of SrcPTKs in SPC-induced Ca(2+) sensitization and effects of EPA. We used porcine coronary VSM and rat aortic VSM cells (VSMCs) in primary culture. An SrcPTKs inhibitor, PP1, and EPA inhibited SPC-induced contraction, concentration-dependently, without affecting [Ca(2+)](i) levels and the Ca(2+)-dependent contraction induced by high K(+) depolarization. A digitized immunocytochemical analysis in VSMCs revealed that SPC induced translocation of Fyn, but not of c-Src, from the cytosol to the cell membrane, an event abolished by EPA. Translocation of Rho-kinase from the cytosol to the cell membrane by SPC was also inhibited by EPA and PP1. The SPC-induced activation of SrcPTKs was blocked by EPA and PP1, but not by Y27632, an Rho-kinase inhibitor. Rho-kinase-dependent phosphorylation of myosin phosphatase induced by SPC was inhibited by EPA, PP1, and Y27632. Translocation and activation of SrcPTKs, including Fyn, play an important role in Ca(2+) sensitization of VSM contractions mediated by a SPC-Rho-kinase pathway." @default.
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- W2076662006 date "2002-11-15" @default.
- W2076662006 modified "2023-10-07" @default.
- W2076662006 title "Involvement of Src Family Protein Tyrosine Kinases in Ca <sup>2+</sup> Sensitization of Coronary Artery Contraction Mediated by a Sphingosylphosphorylcholine-Rho-Kinase Pathway" @default.
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- W2076662006 doi "https://doi.org/10.1161/01.res.0000042702.04920.bf" @default.
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