Autophagy in hypothalamic AgRP neurons regulates food intake and energy balance.

Autophagy in hypothalamic AgRP neurons regulates food intake and energy balance.
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DOI:
10.1016/j.cmet.2011.06.008
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发表时间:
2011-08-03
期刊:
影响因子:
29
通讯作者:
Singh R
Singh R
中科院分区:
生物学1区
文献类型:
--
作者:
Kaushik S;Rodriguez-Navarro JA;Arias E;Kiffin R;Sahu S;Schwartz GJ;Cuervo AM;Singh R

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Macroautophagy is a lysosomal degradative pathway that maintains cellular homeostasis by turning over cellular components. Here, we demonstrate a role for autophagy in hypothalamic agouti-related peptide (AgRP) neurons in the regulation of food intake and energy balance. We show that starvation-induced hypothalamic autophagy mobilizes neuron-intrinsic lipids to generate endogenous free fatty acids, which in turn regulate AgRP levels. The functional consequences of inhibiting autophagy are the failure to upregulate AgRP in response to starvation, and constitutive increases in hypothalamic levels of pro-opiomelanocortin and its cleavage product α-melanocyte stimulating hormone that typically contribute to a lean phenotype. We propose a new conceptual framework for considering how autophagy-regulated lipid metabolism within hypothalamic neurons may modulate neuropeptide levels to have immediate effects on food intake, as well as long-term effects on energy homeostasis. Regulation of hypothalamic autophagy could become an effective intervention in conditions such as obesity and the metabolic syndrome.
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