Cell reports: 反馈性抑制CREB信号促进胰岛素抵抗

2015-02-28 佚名 生物谷

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近日来自美国的研究人员在国际期刊cell reports发表了他们一项最新研究成果。他们通过研究发现CREB信号通路能够通过诱导转录因子MafA表达促进胰岛素分泌,在慢性高血糖症过程中,因PKIB表达上调,抑制了β细胞的CREB活性,进而影响了MafA表达,导致β细胞功能损伤。
 
研究人员指出,血糖的持续升高会导致胰岛的代偿性增加,而胰岛素抵抗会造成β细胞功能退化,最终导致糖尿病发生。之前研究发现cAMP能够通过诱导PKA激活调节肠促胰岛素分泌,阻断β细胞中的cAMP途径会导致严重的血糖不耐受和β细胞的凋亡,而增强PKA活性则会促进胰岛素分泌。cAMP能够通过PKA介导的CREB家族激活因子磷酸化以及CRTC的去磷酸化促进相关基因的表达。
 
研究人员发现在β细胞中敲除CREB共激活因子CRTC2会造成循环系统中胰岛素水平下降,导致小鼠口服葡萄糖耐量损伤。通过实验证实,CRTC2能够通过刺激转录因子MafA表达部分促进β细胞功能。在慢性高血糖病症中,激活HIF1依赖的PKIB会扰乱胰岛细胞的cAMP信号通路,导致基因表达改变,使葡萄糖代谢紊乱,同时,抑制PKIB基因表达能够增强肥胖背景下的胰岛功能。
 
综上所述,该项研究发现了慢性高血糖症中PIKB的表达上调抑制了PKA活性,影响了CREB信号途径,同时发现转录因子MafA能够受到CREB调控,影响β细胞合成和分泌胰岛素的功能。这些结果说明了营养与激素途径之间的交互关系是如何促进胰岛细胞功能损伤的。(生物谷Bioon.com)
 
本文系生物谷原创编译整理,欢迎转载!转载请注明来源并附原文链接。谢谢!
 
 
Blanchet E1, Van de Velde S1, Matsumura S1, Hao E1, LeLay J2, Kaestner K2, Montminy M3.Feedback Inhibition of CREB Signaling Promotes Beta Cell Dysfunction in Insulin Resistance.Cell Rep. 2015 Feb 24;10(7):1149-57. doi: 10.1016/j.celrep.2015.01.046. Epub 2015 Feb 19.

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    2015-09-16 维他命
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    2015-03-30 baoya
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    2015-04-11 x35042875

    AKI对心衰临床治疗意义重大,但依然需要研究检验其适用性

    0

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    2015-03-02 HinsMax

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