Xbp1s in Pomc neurons connects ER stress with energy balance and glucose homeostasis.

Xbp1s in Pomc neurons connects ER stress with energy balance and glucose homeostasis.
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DOI:
10.1016/j.cmet.2014.06.002
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发表时间:
2014-09-02
期刊:
影响因子:
29
通讯作者:
Elmquist JK
Elmquist JK
中科院分区:
生物学1区
文献类型:
--
作者:
Williams KW;Liu T;Kong X;Fukuda M;Deng Y;Berglund ED;Deng Z;Gao Y;Liu T;Sohn JW;Jia L;Fujikawa T;Kohno D;Scott MM;Lee S;Lee CE;Sun K;Chang Y;Scherer PE;Elmquist JK

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肥胖和糖尿病中神经元瘦素和胰岛素抵抗的分子机制尚不清楚。在这里,我们表明,诱导未折叠的蛋白质反应转录因子剪接的X盒结合蛋白1(Xbp1s)在前阿黑皮素(Pomc)神经元单独足以防止饮食诱导的肥胖症,以及改善瘦素和胰岛素敏感性,即使在ER应激的强激活剂的存在下。我们还表明,组成型表达的Xbp1 sinPomc神经元有助于改善肝脏胰岛素敏感性和抑制内源性葡萄糖的产生。值得注意的是,Pomc神经元中Xbp 1 s水平的升高也通过细胞非自主机制导致肝脏中Xbp 1轴的激活。我们的研究结果共同确定了关键的分子机制,将EMPomc神经元中的ER应激与急性瘦素和胰岛素抵抗以及饮食诱导的肥胖和糖尿病中的肝脏代谢联系起来。
The molecular mechanisms underlying neuronal leptin and insulin resistance in obesity and diabetes remain unclear. Here we show that induction of the unfolded protein response transcription factor spliced X-box binding protein 1 (Xbp1s) in pro-opiomelanocortin (Pomc) neurons alone is sufficient to protect against diet-induced obesity as well as improve leptin and insulin sensitivity, even in the presence of strong activators of ER stress. We also demonstrate that constitutive expression ofXbp1sinPomcneurons contributes to improved hepatic insulin sensitivity and suppression of endogenous glucose production. Notably, elevatedXbp1slevels inPomcneurons also resulted in activation of theXbp1saxis in the liver via a cell-nonautonomous mechanism. Together our results identify critical molecular mechanisms linking ER stress in arcuatePomcneurons to acute leptin and insulin resistance as well as liver metabolism in diet-induced obesity and diabetes.
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