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Protein kinase C as a signal for exocytosis

机译:蛋白激酶C作为胞吐信号

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摘要

We have studied signaling mechanisms that stimulate exocytosis and luteinizing hormone secretion in iso- lated male rat pituitary gonadotropes. As judged by reverse hemolytic plaque assays, phorbol-12-myristate-13-acetate (PMA) stimulates as many gonadotropes to secrete as does gonadotropin-releasing hormone (GnRH). However, PMA and GnRH use different signaling pathways. The secretagogue action of GnRH is not very sensitive to bisindolylmaleimide I, an inhibitor of protein kinase C, but is blocked by loading cells with a calcium chelator, 1,2-bis-(2-aminophenoxy)ethane-N,N,N,N- tetraacetic acid. The secretagogue action of PMA is blocked by bisindolylmaleimide I and is not very sensitive to the intracel- lular calcium chelator.
机译:我们已经研究了在分离的雄性大鼠垂体促性腺激素中刺激胞吐作用和促黄体激素分泌的信号传导机制。根据反向溶血斑试验的判断,佛波12-肉豆蔻酸13-醋酸酯(PMA)刺激的促性腺激素分泌量与促性腺激素释放激素(GnRH)一样多。但是,PMA和GnRH使用不同的信号传导途径。 GnRH的促促分泌作用对蛋白激酶C的抑制剂bisindolylmaleimide I并不是很敏感,但可以通过向细胞中加入钙螯合剂1,2-双-(2-氨基苯氧基)乙烷-N,N,N来阻断。 N-四乙酸。 PMA的促分泌作用被bisindolylmaleimide I阻断,并且对细胞内钙螯合剂不是很敏感。

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