title: MIR137 Regulates Starvation-Induced Autophagy by Targeting ATG7.
abstract: Autophagy is a cellular catabolic mechanism in response to stress conditions and has been implicated in the progression and chemoresistance of various cancers. Human microR-137 (MIR137) is involved in neuronal maturation and neurogenesis, while little is known about its role in cancer. In this study, we showed that starvation increased the formation of autophagic marker microtubule-associated protein 1 light chain 3 (LC3) without significant change of MIR137 level in U87 cells. In addition, overexpression of MIR137 decreased LC3 expression and inhibited the degradation of the autophagy receptor sequestosome 1(SQSTM1/p62), while the MIR137 antagomirs showed the opposite effect on these autophagic markers. Moreover, MIR137 overexpression decreased, while its antagomirs increased the expression of autophagy-related 7(ATG7) mRNA and protein. MIR137-mediated inhibition of autophagy was prevented by ATG7. Finally, MIR137 promoted the sensitivity of U87 cells to adriamycin, an anticancer drug. Taken together, our study demonstrated that MIR137 attenuated starvation-induced autophagy by regulating the expression of ATG7.
authors: Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Yuecheng
authors: Y
authors: Zeng
authors: Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China. 771707713@qq.com.
authors: Gang
authors: G
authors: Huo
authors: Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Yongbiao
authors: Y
authors: Mo
authors: Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Wentao
authors: W
authors: Wang
authors: Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Hong
authors: H
authors: Chen
mesh_terms: D001343:Autophagy; D000071193:Autophagy-Related Protein 7; D045744:Cell Line, Tumor; D006801:Humans; D035683:MicroRNAs / Q000235:genetics*; D009474:Neurons / Q000378:metabolism; D044764:Ubiquitin-Activating Enzymes / Q000235:genetics* / Q000378:metabolism
chemical_list: C545567:MIRN137 microRNA, human; D035683:MicroRNAs; C509349:ATG7 protein, human; D000071193:Autophagy-Related Protein 7; D044764:Ubiquitin-Activating Enzymes