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PKC-Dependent Phosphorylation May Regulate the Ability of Connexin43 to Inhibit DNA Synthesis

机译:PKC依赖的磷酸化可能调节Connexin43抑制DNA合成的能力。

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摘要

Phosphorylation affects several biological functions of connexin43 (Cx43), although its role on Cx43-mediated inhibition of DNA synthesis is not known. Previous studies showed increased Cx43 phosphorylation on serine in response to growth factor stimulation of cardiomyocytes, mediated by protein kinase C-epsilon (PKCε). Here we report that activation of PKCε is also necessary for stimulation of cardiomyocyte DNA synthesis and mitosis. We have investigated the participation of specific serine residues that are putative PKC targets in producing phosphorylated Cx43 species and also in regulating DNA synthesis in cardiomyocytes. Interference with the PKC signaling system and/or the phosphorylation of specific amino-acids of Cx43 may allow regulation of the mitogenic response.
机译:磷酸化影响连接蛋白43(Cx43)的几种生物学功能,尽管它在Cx43介导的DNA合成抑制中的作用尚不清楚。先前的研究表明,由蛋白激酶C-ε(PKCε)介导的心肌细胞生长因子刺激后,丝氨酸上Cx43磷酸化的增加。在这里,我们报道激活PKCε也是刺激心肌细胞DNA合成和有丝分裂所必需的。我们已经研究了特定的丝氨酸残基的参与,这些残基是推定的PKC靶标,在产生磷酸化的Cx43物种以及调节心肌细胞的DNA合成中也有参与。干扰PKC信号系统和/或Cx43特定氨基酸的磷酸化可调节促有丝分裂反应。

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