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蛋白激酶C在葡萄糖刺激的胰岛素分泌中作用的重新评估。

A re-assessment of the role of protein kinase C in glucose-stimulated insulin secretion.

作者信息

Hii C S, Jones P M, Persaud S J, Howell S L

机构信息

Department of Physiology, Kings College London, University of London, U.K.

出版信息

Biochem J. 1987 Sep 1;246(2):489-93. doi: 10.1042/bj2460489.

Abstract

Isolated rat islets of Langerhans which had been pretreated with 200 nM-phorbol 12-myristate 13-acetate (PMA) for 20-24 h, a treatment reported in other cell types to deplete cells of protein kinase C activity, were found not to contain detectable Ca2+/phospholipid-dependent protein kinase activity. These islets did not secrete insulin in response to a subsequent exposure to PMA (0.1 or 1 microM) during a 30 min incubation, although insulin secretion could be stimulated by 20 mM-glucose, a response which was enhanced by 20 microM-forskolin. PMA-pretreated islets that had been permeabilized by high-voltage discharge showed unimpaired secretory responses to an increase in Ca2+ concentration, cyclic AMP and forskolin. These results suggest that (i) pretreatment of islets with tumour-promoting phorbol esters may be a useful means of investigating the role of protein kinase C in stimulus-secretion coupling in the pancreatic beta-cell and (ii) protein kinase C may not play an essential role in glucose-induced insulin secretion.

摘要

用200 nM佛波醇12 -肉豆蔻酸酯13 -乙酸酯(PMA)预处理20 - 24小时的分离大鼠胰岛,在其他细胞类型中这种处理会耗尽细胞的蛋白激酶C活性,结果发现这些胰岛不含可检测到的Ca2+/磷脂依赖性蛋白激酶活性。在30分钟的孵育期间,这些胰岛在随后暴露于PMA(0.1或1 microM)时不分泌胰岛素,尽管20 mM葡萄糖可刺激胰岛素分泌,20 microM佛司可林可增强这种反应。经高压放电透化处理的PMA预处理胰岛对Ca2+浓度增加、环磷酸腺苷和佛司可林表现出未受损的分泌反应。这些结果表明:(i)用促肿瘤佛波醇酯预处理胰岛可能是研究蛋白激酶C在胰腺β细胞刺激 - 分泌偶联中作用的有用方法;(ii)蛋白激酶C可能在葡萄糖诱导的胰岛素分泌中不发挥重要作用。

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