Mitochondrial dynamics controlled by mitofusins regulate Agrp neuronal activity and diet-induced obesity.
Mitochondrial dynamics controlled by mitofusins regulate Agrp neuronal activity and diet-induced obesity.
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DOI:
10.1016/j.cell.2013.09.004
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发表时间:
2013-09-26
期刊:
影响因子:
64.5
通讯作者:
Horvath TL
中科院分区:
文献类型:
--
作者:
Dietrich MO;Liu ZW;Horvath TL
Mitochondria are key organelles in the maintenance of cellular energy metabolism and integrity. Here we show that mitochondria number decrease but their size increase in orexigenic Agrp neurons during the transition from fasted to fed to over-fed state. These fusion-like dynamic changes were cell-type specific, as they occurred in the opposite direction in anorexigenic POMC neurons. Interfering with mitochondrial fusion mechanisms in Agrp neurons by cell-selectively knocking down mitofusin-1 (Mfn1) or mitofusin-2 (Mfn2) resulted in altered mitochondria size and density in these cells. Deficiency in mitofusins impaired the electric activity of Agrp neurons during high-fat diet, an event reversed by cell-selective administration of ATP. Agrp-specific Mfn1 or Mfn2 knockout mice gained less weight when fed a high-fat diet due to decreased fat mass. Overall, our data unmask an important role for mitochondrial dynamics governed by Mfn1 and Mfn2 in Agrp neurons in central regulation of whole body energy metabolism.
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