Rapamycin ameliorates age-dependent obesity associated with increased mTOR signaling in hypothalamic POMC neurons.

Rapamycin ameliorates age-dependent obesity associated with increased mTOR signaling in hypothalamic POMC neurons.
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DOI:
10.1016/j.neuron.2012.03.043
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发表时间:
2012-08-09
期刊:
影响因子:
16.2
通讯作者:
Jan LY
Jan LY
中科院分区:
医学1区
文献类型:
--
作者:
Yang SB;Tien AC;Boddupalli G;Xu AW;Jan YN;Jan LY

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老年人肥胖的患病率是代谢综合征的主要原因。作为体重控制的稳态传感器的中枢神经元包括表达阿片黑皮素原(POMC)或神经肽-Y(NPY)和刺鼠相关蛋白(AgRP)的下丘脑神经元。在这里,我们报告了 POMC 神经元中哺乳动物雷帕霉素靶点 (mTOR) 信号的年龄依赖性增加,从而提高了细胞自主的 ATP 敏感钾 (KATP) 通道活性,从而使 POMC 神经元沉默。 mTOR 抑制剂雷帕霉素的全身或脑内给药会导致老年小鼠体重减轻。向老年小鼠脑内注射雷帕霉素可增强 POMC 神经元的兴奋性和神经突投射,从而导致食物摄入量和体重减少。相反,POMC 神经元中缺乏 mTOR 负调节因子 TSC1 的年轻小鼠(但 NPY/AgRP 神经元中缺乏 TSC1 的小鼠)则不会肥胖。我们的研究表明,下丘脑 POMC 神经元中 mTOR 信号传导的增加会导致年龄依赖性肥胖。
The prevalence of obesity in older people is the leading cause of metabolic syndromes. Central neurons serving as homeostatic sensors for bodyweight control include hypothalamic neurons that express pro-opiomelanocortin (POMC) or neuropeptide-Y (NPY) and agouti-related protein (AgRP). Here we report an age-dependent increase of mammalian target of rapamycin (mTOR) signaling in POMC neurons that elevates the ATP-sensitive potassium (KATP) channel activity cell-autonomously to silence POMC neurons. Systemic or intracerebral administration of the mTOR inhibitor rapamycin causes weight loss in old mice. Intracerebral rapamycin infusion into old mice enhances the excitability and neurite projection of POMC neurons, thereby causing a reduction of food intake and bodyweight. Conversely, young mice lacking the mTOR negative regulator TSC1 in POMC neurons, but not those lacking TSC1 in NPY/AgRP neurons, were obese. Our study reveals that an increase in mTOR signaling in hypothalamic POMC neurons contributes to age-dependent obesity.
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