Mitochondrial derived vesicle-carrying protein MIGA2 promotes copper-induced autophagosomes-lysosomes fusion by regulating ATG14

• Published in: Journal of hazardous materials 2024-04, Vol.467, p.133703-133703, Article 133703
• Main Authors: Li, Quanwei, Guo, Pan, Wang, Shaofeng, Feng, Yuanhong, Zhang, Hui, Yu, Wenlan, Liao, Jianzhao, Tang, Zhaoxin
• Format: Article
• Language: English
• Subjects: ATG14; Autophagosome-lysosome fusion; autophagosomes; Copper; Hepatocytes; metabolism; MIGA2; mitochondria; Mitochondria-derived vesicles; pollution; precipitin tests; quality control; RNA interference; secretion; toxicity
• ISSN: 0304-3894; 1873-3336; 1873-3336
• DOI: 10.1016/j.jhazmat.2024.133703

As an environmental pollution metal, copper (Cu) exposure-induced toxicity is closely related to mitochondrial damage. Mitochondrial-derived vesicles (MDVs) plays an essential role in mitochondrial quality control and cellular metabolism. However, the mechanism by which MDVs are involved in cellular metabolism under Cu exposure remains unclear. Here, the MDV-carrying protein MIGA2 was identified as a crucial molecule involved in the Cu-induced autophagosomes-lysosomes fusion. Furthermore, Cu exposure significantly promoted MDVs secretion, accompanied by a markedly increased MIGA2 expression in MDVs, as well as accelerated the autophagosomes-lysosomes fusion. However, small RNA interference of SNX9 (the MDVs secretion inductor) and MIGA2 blocked autophagic flux induced by Cu, leading to failure of autophagosomes degradation. Co-immunoprecipitation assay further demonstrated that ATG14 was a regulation target protein of MIGA2. Overexpression and knockdown of ATG14 significantly affected the autophagosomes-lysosomes fusion induced by Cu. Meanwhile, knockdown of ATG14 dramatically reversed the effect of MIGA2-overexpression in promoting autophagosomes-lysosomes fusion, while overexpression of ATG14 shows the opposite effect. These results demonstrated that MDVs-carrying MIGA2 protein promoted autophagosomes-lysosomes fusion induced by Cu. This study demonstrated that MDVs is involved in regulating organelles-to-organelles communication, providing a new insight into the toxicity mechanism of Cu exposure on hepatocytes. [Display omitted] •Copper exposure promoted mitochondrial-derived vesicle (MDV) release to cytoplasm.•Cu upregulated the expression of MDV-carrying protein MIGA2.•ATG14 was the target protein of MIGA2.•MIGA2 was involved in fusion of autophagosomes and lysosomes by regulating ATG14.