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Platelet GPIb-IX-V-dependent signaling |
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AbstractSummary. Although the signaling pathways related to GPIb-IX-V have not been fully elucidated, an accumulating body of evidence suggests that phospholipase C (PLC)03B32 activation, subsequent Ca++ release and oscillations constitute an essential signal transduction pathway related to GPIb-IX-V. Src family kinases are required for PLC03B32 activation, while FcR03B3-chain/Fc03B3RIIA may be dispensable for PLC03B32 activation. Although PI-3K serves to potentiate various signaling events culminating in 03B1IIb03B23 activation, PI-3K activity may be dispensable for Src-PLC03B32 activation in GPIb-IX-V-mediated signaling. Glycosphingolipid-enriched microdomains (GEMs) appear to provide platforms for the signal transduction pathway related to GIb-IX-V, as the interaction between GPIb-IX-V and Src or PLC03B32 tyrosine phosphorylation occurs exclusively in GEMs.
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