Mitophagy inhibits proliferation by decreasing cyclooxygenase-2 (COX-2) in arsenic trioxide-treated HepG2 cells.
Mitochondrial damage can trigger mitophagy and eventually suppress proliferation. However, the effect of mitophagy on proliferation remains unclear. In this study, HepG2 cells were used to assess mitophagy and proliferation arrest in response to As2O3 exposure. The stimulatory effect of As2O3 on mitophagy was investigated by assessing morphology (mitophagosome and mitolysosome) and relevant proteins (PINK1, LC3 II/I, and COX IV). Additionally, the relationship of mitophagy and proliferation was explored through the use of mitophagy inhibitors (CsA, Mdivi-1). Interestingly, the inhibition of mitophagy rescued proliferation arrest by restoring COX-2 protein level and countered the elimination of mitochondria-located COX-2 and up-regulated the COX-2 mRNA level. Taken together, our findings indicated that mitophagy can be induced and can inhibit proliferation by reducing COX-2 in HepG2 cells during As2O3 treatment.
Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
Zhidan
Z
Niu
Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China. Electronic address: zhangwenya@lzu.edu.cn.
Wenya
W
Zhang
Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
Xueyan
X
Gu
Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
Xiaoning
X
Zhang
Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
Yongmei
Y
Qi
Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China. Electronic address: ymzhang@lzu.edu.cn.
Yingmei
Y
Zhang
D000970:Antineoplastic Agents / Q000494:pharmacology*; D000077237:Arsenic Trioxide; D001152:Arsenicals / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects*; D002470:Cell Survival / Q000187:drug effects; D051546:Cyclooxygenase 2 / Q000378:metabolism*; D003593:Cytoplasm / Q000187:drug effects / Q000201:enzymology / Q000473:pathology; D004305:Dose-Response Relationship, Drug; D056945:Hep G2 Cells; D006801:Humans; D018613:Microscopy, Confocal; D008928:Mitochondria / Q000187:drug effects / Q000201:enzymology / Q000473:pathology; D063306:Mitophagy / Q000187:drug effects*; D010087:Oxides / Q000494:pharmacology*; D013997:Time Factors
D000970:Antineoplastic Agents; D001152:Arsenicals; D010087:Oxides; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D000077237:Arsenic Trioxide
Arsenic trioxide; Cyclooxygenase-2; HepG2; Mitophagy; Proliferation