HUMMR, a hypoxia- and HIF-1alpha-inducible protein, alters mitochondrial distribution and transport.

HUMMR, a hypoxia- and HIF-1alpha-inducible protein, alters mitochondrial distribution and transport.
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DOI:
10.1083/jcb.200811033
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发表时间:
2009-06-15
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Rempe DA
Rempe DA
中科院分区:
其他
文献类型:
--
作者:
Li Y;Lim S;Hoffman D;Aspenstrom P;Federoff HJ;Rempe DA

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线粒体转运对于维持正常神经元功能至关重要。在这里,我们确定了一种新的线粒体蛋白,缺氧上调线粒体运动调节因子(HUMMR),它在神经元中表达,并显着诱导缺氧诱导因子1 α(HIF-1α)。有趣的是,HUMMR与Miro-1和Miro-2相互作用,这两种线粒体蛋白对介导线粒体转运至关重要。有趣的是,在暴露于缺氧的神经元中,HUMMR或HIF-1功能的敲低显著降低了轴突中的线粒体含量。由于线粒体转运和分布是密不可分的,因此还探讨了HUMMR功能降低对线粒体转运方向的影响。缺氧时HUMMR功能的丧失减少了运动的线粒体在顺行方向的百分比,并增加了在逆行方向的百分比。因此,HUMMR,一种新的线粒体蛋白诱导的HIF-1和缺氧,偏向于线粒体运输的顺行方向。这些发现对维持生理和病理状态下的神经元活力和功能具有广泛的意义。
Mitochondrial transport is critical for maintenance of normal neuronal function. Here, we identify a novel mitochondria protein, hypoxia up-regulated mitochondrial movement regulator (HUMMR), which is expressed in neurons and is markedly induced by hypoxia-inducible factor 1 α (HIF-1α). Interestingly, HUMMR interacts with Miro-1 and Miro-2, mitochondrial proteins that are critical for mediating mitochondrial transport. Interestingly, knockdown of HUMMR or HIF-1 function in neurons exposed to hypoxia markedly reduces mitochondrial content in axons. Because mitochondrial transport and distribution are inextricably linked, the impact of reduced HUMMR function on the direction of mitochondrial transport was also explored. Loss of HUMMR function in hypoxia diminished the percentage of motile mitochondria moving in the anterograde direction and enhanced the percentage moving in the retrograde direction. Thus, HUMMR, a novel mitochondrial protein induced by HIF-1 and hypoxia, biases mitochondria transport in the anterograde direction. These findings have broad implications for maintenance of neuronal viability and function during physiological and pathological states.
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