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Role for insulin signaling in catecholaminergic neurons in control of energy homeostasis.

机译:胰岛素信号在儿茶酚胺能神经元控制能量稳态中的作用。

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Dopaminergic midbrain neurons integrate signals on food palatability and food-associated reward into the complex control of energy homeostasis. To define the role of insulin receptor (IR) signaling in this circuitry, we inactivated IR signaling in tyrosine hydroxylase (Th)-expressing cells of mice (IR(DeltaTh)). IR inactivation in Th-expressing cells of mice resulted in increased body weight, increased fat mass, and hyperphagia. While insulin acutely stimulated firing frequency in 50% of dopaminergic VTA/SN neurons, this response was abolished in IR(DeltaTh) mice. Moreover, these mice exhibited an altered response to cocaine under food-restricted conditions. Taken together, these data provide in vivo evidence for a critical role of insulin signaling in catecholaminergic neurons to control food intake and energy homeostasis.
机译:多巴胺能中脑神经元将食物适口性和食物相关奖励的信号整合到能量稳态的复杂控制中。若要定义胰岛素受体(IR)信号在此电路中的作用,我们灭活了小鼠酪氨酸羟化酶(Th)表达细胞(IR(DeltaTh))中的IR信号。小鼠表达Th的细胞的IR失活导致体重增加,脂肪量增加和食欲亢进。虽然胰岛素在50%的多巴胺能VTA / SN神经元中能刺激激发频率,但在IR(DeltaTh)小鼠中这种反应被取消了。此外,这些小鼠在食物限制条件下对可卡因的反应有所改变。综上所述,这些数据为体内胰岛素信号在儿茶酚胺能神经元控制食物摄入和能量稳态中的关键作用提供了证据。

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