Loss of autophagy in pro-opiomelanocortin neurons perturbs axon growth and causes metabolic dysregulation.

Loss of autophagy in pro-opiomelanocortin neurons perturbs axon growth and causes metabolic dysregulation.
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DOI:
10.1016/j.cmet.2011.12.016
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发表时间:
2012-02-08
期刊:
影响因子:
29
通讯作者:
Bouret SG
Bouret SG
中科院分区:
生物学1区
文献类型:
--
作者:
Coupé B;Ishii Y;Dietrich MO;Komatsu M;Horvath TL;Bouret SG

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The hypothalamic melanocortin system, which includes neurons that produce proopiomelanocortin (POMC)-derived peptides, is a major negative regulator of energy balance. POMC neurons begin to acquire their unique properties during neonatal life. The formation of functional neural systems requires massive cytoplasmic remodeling that may involve autophagy, an important intracellular mechanism for the degradation of damaged proteins and organelles. Here we investigated the functional and structural effects of the deletion of an essential autophagy gene, Atg7, in POMC neurons. Lack of Atg7 in POMC neurons caused higher post-weaning body weight, increased adiposity, and glucose intolerance. These metabolic impairments were associated with an age-dependant accumulation of ubiquitin/p62-positive aggregates in the hypothalamus and a disruption in the maturation of POMC-containing axonal projections. Together, these data provide direct genetic evidence that Atg7 in POMC neurons is required for normal metabolic regulation and neural development, and they implicate hypothalamic autophagy deficiency in the pathogenesis of obesity.
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