Mitofusin 2 Regulates Axonal Transport of Calpastatin to Prevent Neuromuscular Synaptic Elimination in Skeletal Muscles.

Mitofusin 2 Regulates Axonal Transport of Calpastatin to Prevent Neuromuscular Synaptic Elimination in Skeletal Muscles.
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Mitofusin 2 调节 Calpastatin 的轴突运输,以防止骨骼肌中的神经肌肉突触消除。

DOI:
10.1016/j.cmet.2018.06.011
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发表时间:
2018
期刊:
影响因子:
29
通讯作者:
Hoppel,C
Hoppel,C
中科院分区:
生物学1区
文献类型:
--
作者:
Wang,Luwen;Gao,Ju;Liu,Jingyi;Siedlak,SandraL;Torres,Sandy;Fujioka,Hisashi;Huntley,MikaylaL;Jiang,Yinfei;Ji,Haiyan;Yan,Tingxiang;Harland,Micah;Termsarasab,Pichet;Zeng,Sophia;Jiang,Zhen;Liang,Jingjing;Perry,George;Hoppel,C

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Skeletal muscles undergo atrophy in response to diseases and aging. Here we report that mitofusin 2 (Mfn2) acts as a dominant suppressor of neuromuscular synaptic loss to preserve skeletal muscles. Mfn2 is reduced in spinal cords of transgenic SOD1G93Aand aged mice. Through preserving neuromuscular synapses, increasing neuronal Mfn2 prevents skeletal muscle wasting in both SOD1G93Aand aged mice, whereas deletion of neuronal Mfn2 produces neuromuscular synaptic dysfunction and skeletal muscle atrophy. Neuromuscular synaptic loss after sciatic nerve transection can also be alleviated by Mfn2. Mfn2 coexists with calpastatin largely in mitochondria-associated membranes (MAMs) to regulate its axonal transport. Genetic inactivation of calpastatin abolishes Mfn2-mediated protection of neuromuscular synapses. Our results suggest that, as a potential key component of a novel and heretofore unrecognized mechanism of cytoplasmic protein transport, Mfn2 may play a general role in preserving neuromuscular synapses and serve as a common therapeutic target for skeletal muscle atrophy.
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