Rho-kinase regulates energy balance by targeting hypothalamic leptin receptor signaling.

Rho-kinase regulates energy balance by targeting hypothalamic leptin receptor signaling.
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DOI:
10.1038/nn.3207
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发表时间:
2012-10
影响因子:
25
通讯作者:
Kim, Young-Bum
Kim, Young-Bum
中科院分区:
医学1区
文献类型:
--
作者:
Huang, Hu;Kong, Dong;Byun, Kyung Hee;Ye, Chianping;Koda, Shuichi;Lee, Dae Ho;Oh, Byung-Chul;Lee, Sam W.;Lee, Bonghee;Zabolotny, Janice M.;Kim, Min Seon;Bjorbaek, Christian;Lowell, Bradford B.;Kim, Young-Bum

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瘦素调节能量平衡。然而,关于瘦素信号的关键细胞内转导的知识仍然不完整。在这里,我们报道了Rho-kinase1(ROCK1)通过激活JAK2来调节瘦素对体重动态平衡的作用,JAK2是瘦素受体信号的初始触发。瘦素促进JAK2和ROCK1的物理相互作用,从而增加JAK2的磷酸化和STAT3和FOXO1的下游激活。POMC或AgRP神经元中缺乏ROCK1的小鼠,是瘦素作用的中介,表现为肥胖和瘦素敏感性受损。此外,弓状核中ROCK1基因的缺失显著增加了食物的摄入量,导致严重肥胖。值得注意的是,ROCK1是瘦素的特异性介体,而不是胰岛素,调节POMC神经元的活动。我们的数据确定ROCK1是瘦素在能量稳态中作用的关键调节因子。
Leptin regulates energy balance. However, knowledge of the critical intracellular transducers of leptin signaling remains incomplete. Here we report that Rho-kinase 1 (ROCK1) regulates leptin action on body weight homeostasis by activating JAK2, an initial trigger of leptin receptor signaling. Leptin promotes the physical interaction of JAK2 and ROCK1, thereby increasing phosphorylation of JAK2 and downstream activation of Stat3 and FOXO1. Mice lacking ROCK1 in either POMC or AgRP neurons, mediators of leptin action, display obesity and impaired leptin sensitivity. In addition, deletion of ROCK1 in the arcuate nucleus markedly enhances food intake, resulting in severe obesity. Of note, ROCK1 is a specific mediator of leptin, but not insulin, regulation of POMC neuronal activity. Our data identify ROCK1 as a key regulator of leptin action on energy homeostasis.
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