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AMPK contributes to autophagosome maturation and lysosomal fusion.


ABSTRACT: 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 ?1 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 ?1 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 ?1 knockout cells. The transient expression of AMPK ?1 can rescue autophagosome maturation. These results indicate that AMPK ?1 is required for efficient autophagosome maturation and lysosomal fusion.

SUBMITTER: Jang M 

PROVIDER: S-EPMC6107659 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

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AMPK contributes to autophagosome maturation and lysosomal fusion.

Jang Minsu M   Park Rackhyun R   Kim Hyunju H   Namkoong Sim S   Jo Daum D   Huh Yang Hoon YH   Jang Ik-Soon IS   Lee Jin I JI   Park Junsoo J  

Scientific reports 20180823 1


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-indep  ...[more]

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