期刊
AUTOPHAGY
卷 14, 期 9, 页码 1574-1585出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/15548627.2018.1463120
关键词
Autophagy; lysosome; MTORC1; TFEB; TRIM37
类别
资金
- HHS \ NIH \ National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) [5RO1 DK41737]
TRIM37 gene mutations cause mulibrey (muscle-liver-brain-eye) nanism, a severe growth disorder with prenatal onset. Although TRIM37 depletion normally induces apoptosis, patients with TRIM37 mutations have a high risk of developing tumors, suggesting that there may be an alternative pro-survival mechanism for TRIM37-deficient tumor cells. We find that TRIM37 interacts with MTOR and RRAGB proteins, enhances the MTOR-RRAGB interaction and promotes lysosomal localization of MTOR, thereby activating amino acid-stimulated MTORC1 signaling. In response to loss of TRIM37 functions, phosphorylation of TFEB is significantly reduced, resulting in its translocation into the nucleus enabling its transcriptional activation of genes involved in lysosome biogenesis and macroautophagy/autophagy. The enhanced autophagy depends on the inhibition of MTORC1 signaling and may serve as an alternative mechanism to survive the loss of TRIM37 functions. Our study unveils a positive role of TRIM37 in regulating the MTORC1-TFEB axis and provides mechanistic insights into the pathogenesis of mulibrey nanism, as well as potential therapeutic treatment.
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