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- W2017164563 abstract "Mobilization of intracellular calcium is an indispensable step of fertilization-induced egg activation. Recently, this process has been shown to require the sequential activation of Src family tyrosine kinases, phospholipase Cgamma (PLCgamma), and inositol-1,4,5-trisphosphate (IP3)-dependent receptor of endoplasmic reticulum. In the present study, we made an attempt to recapitulate the early events of egg activation by stimulating Src kinase activity in the cell-free extracts of Xenopus eggs. We found that enhanced Src kinase activity can initiate calcium response of low magnitude in cytostatic factor (CSF)-arrested mitotic extracts without releasing them into interphase. The addition of catalytically active recombinant Src kinase, as well as the activation of endogenous Xenopus Src family kinase by hydrogen peroxide (H2O2), increased total tyrosine phosphorylation, tyrosine phosphorylation of PLCgamma, and IP3 production in the extracts. The treatment with the Src family kinase-specific inhibitor, PP1, or PLC inhibitor, U73122, or IP3 receptor antagonist, heparin, prevented calcium release in the extracts. We conclude, therefore, that possible mechanism of Src/H2O2 action in the extracts might involve tyrosine phosphorylation and activation of PLCgamma, accompanied by the increase in IP3 content and subsequent calcium release from IP3-regulated calcium stores. These results also suggest that monitoring calcium signals induced in the Xenopus egg extracts by various components of signaling pathways may provide a particularly useful approach to investigating their role in the signal transduction." @default.
- W2017164563 created "2016-06-24" @default.
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- W2017164563 date "2002-07-01" @default.
- W2017164563 modified "2023-10-09" @default.
- W2017164563 title "Src kinase induces calcium release in Xenopus egg extracts via PLCγ and IP3-dependent mechanism" @default.
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- W2017164563 doi "https://doi.org/10.1016/s0143-4160(02)00078-7" @default.
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