AMPK contributes to autophagosome maturation and lysosomal fusion.

AMPK contributes to autophagosome maturation and lysosomal fusion.
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DOI:
10.1038/s41598-018-30977-7
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发表时间:
2018-08-23
期刊:
影响因子:
4.6
通讯作者:
Park J
Park J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Jang M;Park R;Kim H;Namkoong S;Jo D;Huh YH;Jang IS;Lee JI;Park J

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当细胞内ATP水平降低时,AMPK可调节自噬的发生。然而,AMPK在自噬体成熟过程中的作用尚不完全清楚。在这里,我们报道AMPK有助于有效的自噬体成熟和溶酶体融合。利用CRISPR-Cas9基因编辑技术,我们获得了敲除AMPK α1的HEK293T细胞系,其中饥饿诱导的自噬受损。利用化合物C(一种不依赖AMPK的自噬诱导剂)和海藻糖(一种不依赖mtor的自噬诱导剂)来研究AMPK在自噬体成熟和溶酶体融合中的作用。对照细胞用化合物C或海藻糖处理均可诱导自噬体和自溶体的活化,而用化合物C或海藻糖处理AMPK α1敲除细胞主要诱导自噬体的活化,而不诱导自溶体的活化。我们证明这种效应是由于干扰了AMPK α1敲除细胞中自噬体与溶酶体的融合。AMPK α1的瞬时表达可以挽救自噬体的成熟。这些结果表明AMPK α1是有效的自噬体成熟和溶酶体融合所必需的。
AMP-activated protein kinase (AMPK) regulates autophagy initiation when intracellular ATP level decreases. However, the role of AMPK during autophagosome maturation is not fully understood. Here, we report that AMPK contributes to efficient autophagosome maturation and lysosomal fusion. Using CRISPR-Cas9 gene editing, we generated AMPK α1 knockout HEK293T cell lines, in which starvation-induced autophagy is impaired. Compound C, an AMPK-independent autophagy inducer, and trehalose, an mTOR-independent autophagy inducer were used to examine the role of AMPK in autophagosome maturation and lysosomal fusion. While the treatment of control cells with either compound C or trehalose induces activation of autophagosomes as well as autolysosomes, the treatment of AMPK α1 knockout cells with compound C or trehalose induces mainly activation of autophagosomes, but not autolysosomes. We demonstrate that this effect is due to interference with the fusion of autophagosomes with lysosomes in AMPK α1 knockout cells. The transient expression of AMPK α1 can rescue autophagosome maturation. These results indicate that AMPK α1 is required for efficient autophagosome maturation and lysosomal fusion.
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