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
Horvath TL
中科院分区:
生物学1区
文献类型:
--
作者:
Dietrich MO;Liu ZW;Horvath TL

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线粒体是维持细胞能量代谢和完整性的关键细胞器。本研究表明,在从禁食到喂食再到过度喂食的过渡过程中,厌氧Agrp神经元的线粒体数量减少,但大小增加。这些融合样的动态变化是细胞类型特异性的,因为它们在厌氧性POMC神经元中以相反的方向发生。通过细胞选择性敲低mitofusin-1 (Mfn1)或mitofusin-2 (Mfn2)干扰Agrp神经元的线粒体融合机制,导致这些细胞线粒体大小和密度的改变。在高脂肪饮食中,有丝分裂蛋白的缺乏损害了Agrp神经元的电活动,这一事件被细胞选择性给予ATP逆转。由于脂肪量减少,当喂食高脂肪饮食时,agrp特异性Mfn1或Mfn2敲除小鼠体重增加较少。总之,我们的数据揭示了Agrp神经元中由Mfn1和Mfn2控制的线粒体动力学在全身能量代谢的中枢调节中的重要作用。
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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