InsR/FoxO1 signaling curtails hypothalamic POMC neuron number.

InsR/FoxO1 signaling curtails hypothalamic POMC neuron number.
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DOI:
10.1371/journal.pone.0031487
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Accili D
Accili D
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Plum L;Lin HV;Aizawa KS;Liu Y;Accili D

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胰岛素受体(InsR)通过转录因子FoxO 1的信号传导在下丘脑神经元摄食回路的发育中是重要的,但是关于其潜在机制的知识是有限的。为了研究InsR/FoxO 1信号传导在这些回路的发展和维持中的作用,我们调查了下丘脑InsR信号传导受损的不同小鼠模型中表达Pomc mRNA的下丘脑神经元的库。InsR消融在整个下丘脑不影响Pomc神经元数量在出生时,但导致25%的增加,最显着的是在中间弓状核区域,在年轻的成年人。在这些小鼠中,POMC神经元中InsR表达的选择性恢复部分逆转了这种异常,导致与年龄匹配的对照组相比减少了10%。为了确定FoxO 1信号传导是否在这一过程中发挥作用,我们检查了POMC特异性FoxO 1缺失小鼠的POMC神经元数量,并检测到年龄匹配的动物减少了23%,这与InsR/FoxO 1信号传导在调节POMC神经元数量中的细胞自主作用一致,与其激活Pomc转录的既定作用不同。Pomc细胞的这些变化发生在体液因子或下丘脑NPY神经元没有明显变化的情况下。
Insulin receptor (InsR) signaling through transcription factor FoxO1 is important in the development of hypothalamic neuron feeding circuits, but knowledge about underlying mechanisms is limited. To investigate the role of InsR/FoxO1 signaling in the development and maintenance of these circuits, we surveyed the pool of hypothalamic neurons expressing Pomc mRNA in different mouse models of impaired hypothalamic InsR signaling. InsR ablation in the entire hypothalamus did not affect Pomc-neuron number at birth, but resulted in a 25% increase, most notably in the middle arcuate nucleus region, in young adults. Selective restoration of InsR expression in POMC neurons in these mice partly reversed the abnormality, resulting in a 10% decrease compared to age-matched controls. To establish whether FoxO1 signaling plays a role in this process, we examined POMC neuron number in mice with POMC-specific deletion of FoxO1, and detected a 23% decrease in age-matched animals, consistent with a cell-autonomous role of InsR/FoxO1 signaling in regulating POMC neuron number, distinct from its established role to activate Pomc transcription. These changes in Pomc cells occurred in the absence of marked changes in humoral factors or hypothalamic NPY neurons.
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