Anchored phosphatases modulate glucose homeostasis

Anchored phosphatases modulate glucose homeostasis
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DOI:
10.1038/emboj.2012.244
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发表时间:
2012-10-17
期刊:
影响因子:
11.4
通讯作者:
Scott, John D.
Scott, John D.
中科院分区:
生物学1区
文献类型:
--
作者:
Hinke, Simon A.;Navedo, Manuel F.;Scott, John D.

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胰岛素的内分泌释放主要控制葡萄糖稳态。营养诱导的胰腺 β 细胞胰岛素颗粒的胞吐作用涉及离子通道以及 Ca2+ 和环 AMP (cAMP) 信号通路的动员。整体动物生理学、胰岛研究和活 β 细胞成像方法表明,激酶/磷酸酶锚定蛋白 AKAP150 的消融会损害小鼠的胰岛素分泌。 AKAP150 的缺失会影响 L 型 Ca2+ 电流,并减弱 β 细胞中 Ca2+ 和 cAMP 的细胞质积累。然而令人惊讶的是,AKAP150 缺失的动物在骨骼肌中表现出改善的葡萄糖处理能力和更高的胰岛素敏感性。对无法锚定蛋白激酶 A 或蛋白磷酸酶 2B 的 AKAP150 敲入小鼠进行更精细的分析,发现了一个意想不到的观察结果:磷酸酶与锚定蛋白的七残基序列的束缚是这些代谢表型背后的主要分子事件。因此,促进胰岛素分泌和葡萄糖稳态的锚定信号事件可能是由 AKAP150 相关磷酸酶活性设定的。 EMBO 杂志 (2012) 31, 3991-4004。 doi:10.1038/emboj.2012.244; 2012 年 8 月 31 日在线发布
Endocrine release of insulin principally controls glucose homeostasis. Nutrient-induced exocytosis of insulin granules from pancreatic beta-cells involves ion channels and mobilization of Ca2+ and cyclic AMP (cAMP) signalling pathways. Whole-animal physiology, islet studies and live-beta-cell imaging approaches reveal that ablation of the kinase/phosphatase anchoring protein AKAP150 impairs insulin secretion in mice. Loss of AKAP150 impacts L-type Ca2+ currents, and attenuates cytoplasmic accumulation of Ca2+ and cAMP in beta-cells. Yet surprisingly AKAP150 null animals display improved glucose handling and heightened insulin sensitivity in skeletal muscle. More refined analyses of AKAP150 knock-in mice unable to anchor protein kinase A or protein phosphatase 2B uncover an unexpected observation that tethering of phosphatases to a seven-residue sequence of the anchoring protein is the predominant molecular event underlying these metabolic phenotypes. Thus anchored signalling events that facilitate insulin secretion and glucose homeostasis may be set by AKAP150 associated phosphatase activity. The EMBO Journal (2012) 31, 3991-4004. doi:10.1038/emboj.2012.244; Published online 31 August 2012