AKT signalling selectively regulates PINK1 mitophagy in SHSY5Y cells and human iPSC-derived neurons.

AKT signalling selectively regulates PINK1 mitophagy in SHSY5Y cells and human iPSC-derived neurons.
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DOI:
10.1038/s41598-018-26949-6
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发表时间:
2018-06-11
期刊:
影响因子:
4.6
通讯作者:
Plun-Favreau H
Plun-Favreau H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Soutar MPM;Kempthorne L;Miyakawa S;Annuario E;Melandri D;Harley J;O'Sullivan GA;Wray S;Hancock DC;Cookson MR;Downward J;Carlton M;Plun-Favreau H

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与常染色体隐性遗传帕金森病相关的基因突变的发现使得 PINK1/Parkin 调节的线粒体自噬被鉴定为去除受损线粒体的重要途径。虽然最近的研究表明 AKT 依赖性信号传导调节 Parkin 募集到去极化线粒体,但很少有人知道这是否也可以调节 PINK1 线粒体积累和下游线粒体自噬。在这里,我们证明抑制 AKT 信号传导会减少内源性 PINK1 积累,以响应线粒体去极化、随后的 Parkin 募集、泛素磷酸化以及最终的线粒体自噬。相反,我们发现在通过胰岛素刺激 AKT 信号传导后,SHSY5Y 细胞中的线粒体自噬途径会增加。这些数据表明 AKT 信号传导是受损线粒体上 PINK1 积累的上游调节因子。重要的是,我们发现 AKT 通路还调节人 iPSC 衍生神经元中内源性 PINK1 依赖性线粒体自噬。
The discovery of mutations within genes associated with autosomal recessive Parkinson’s disease allowed for the identification of PINK1/Parkin regulated mitophagy as an important pathway for the removal of damaged mitochondria. While recent studies suggest that AKT-dependent signalling regulates Parkin recruitment to depolarised mitochondria, little is known as to whether this can also regulate PINK1 mitochondrial accumulation and downstream mitophagy. Here, we demonstrate that inhibition of AKT signalling decreases endogenous PINK1 accumulation in response to mitochondria depolarisation, subsequent Parkin recruitment, phosphorylation of ubiquitin, and ultimately mitophagy. Conversely, we show that upon stimulation of AKT signalling via insulin, the mitophagy pathway is increased in SHSY5Y cells. These data suggest that AKT signalling is an upstream regulator of PINK1 accumulation on damaged mitochondria. Importantly, we show that the AKT pathway also regulates endogenous PINK1-dependent mitophagy in human iPSC-derived neurons.
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