Disruption of Atg7-dependent autophagy causes electromotility disturbances, outer hair cell loss, and deafness in mice.

Disruption of Atg7-dependent autophagy causes electromotility disturbances, outer hair cell loss, and deafness in mice.
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Atg7 依赖性自噬的破坏会导致小鼠电动性紊乱、外毛细胞丢失和耳聋。

DOI:
10.1038/s41419-020-03110-8
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发表时间:
2020-10-24
影响因子:
9
通讯作者:
Gao X
Gao X
中科院分区:
生物学1区
文献类型:
--
作者:
Zhou H;Qian X;Xu N;Zhang S;Zhu G;Zhang Y;Liu D;Cheng C;Zhu X;Liu Y;Lu L;Tang J;Chai R;Gao X

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at7是典型非选择性自噬中不可缺少的因子。本研究表明,随着时间的推移,小鼠外毛细胞(ohc)中Atg7的基因消融会导致体纤毛损伤、体细胞电运动性障碍和突触前带变性,从而导致ohc的逐渐大规模丧失和随后的早发性重度听力损失。受损的自噬破坏了OHC线粒体功能,引发了功能失调线粒体的积累,否则这些线粒体将被及时消除。Atg7独立的自噬/有丝自噬过程不能补偿Atg7的缺乏,也不能挽救终末分化的非增殖OHCs。我们的研究结果表明,OHCs协调复杂的非选择性和选择性自噬/有丝自噬途径协同工作以维持细胞稳态。总之,我们的研究结果表明atg7依赖性自噬在保留ohc和维持听力功能方面起着关键的细胞保护作用。
Atg7 is an indispensable factor that plays a role in canonical nonselective autophagy. Here we show that genetic ablation of Atg7 in outer hair cells (OHCs) in mice caused stereocilium damage, somatic electromotility disturbances, and presynaptic ribbon degeneration over time, which led to the gradual wholesale loss of OHCs and subsequent early-onset profound hearing loss. Impaired autophagy disrupted OHC mitochondrial function and triggered the accumulation of dysfunctional mitochondria that would otherwise be eliminated in a timely manner. Atg7-independent autophagy/mitophagy processes could not compensate for Atg7 deficiency and failed to rescue the terminally differentiated, non-proliferating OHCs. Our results show that OHCs orchestrate intricate nonselective and selective autophagic/mitophagy pathways working in concert to maintain cellular homeostasis. Overall, our results demonstrate that Atg7-dependent autophagy plays a pivotal cytoprotective role in preserving OHCs and maintaining hearing function.
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