期刊
FEBS JOURNAL
卷 289, 期 18, 页码 5682-5696出版社
WILEY
DOI: 10.1111/febs.16447
关键词
age-related cataract; MSH3; oxidative damage repair; protein degradation; SYVN1
资金
- National Natural Science Foundation of China [81974129, 81770906, 81500706, 82171038, 82101101]
- Postdoctoral Science Foundation of China [2020M671562]
- Postdoctoral Science Foundation of Jiangsu Province [2020Z318]
- Science and Technology Project of Nantong Municipality [MS22019012, JCZ19088, JC2019078, MS12019030]
- Project of Nantong Municipal Health Commission [QA2019061]
The pathology of age-related cataract involves protein misfolding and aggregation, and the function and mechanism of MSH3 in maintaining MSH3 protein stability during cataractogenesis are not known. This study found that UVB exposure reduces MSH3 protein expression, and accelerates its degradation through ubiquitination and degradation. The E3 ubiquitin ligase SYVN1 interacts with MSH3 and promotes its ubiquitination and degradation. SYVN1 regulates MSH3 protein degradation through the ubiquitin-proteasome pathway and the autophagy-lysosome pathway.
The pathology of age-related cataract (ARC) mainly involves the misfolding and aggregation of proteins, especially oxidative damage repair proteins, in the lens, induced by ultraviolet-B (UVB). MSH3, as a key member of the mismatch repair family, primarily maintains genome stability. However, the function of MSH3 and the mechanism by which cells maintain MSH3 proteostasis during cataractogenesis remains unknown. In the present study, the protein expression levels of MSH3 were found to be attenuated in ARC specimens and SRA01/04 cells under UVB exposure. The ectopic expression of MSH3 notably impeded UVB-induced apoptosis, whereas the knockdown of MSH3 promoted apoptosis. Protein half-life assay revealed that UVB irradiation accelerated the decline of MSH3 by ubiquitination and degradation. Subsequently, we found that E3 ubiquitin ligase synoviolin (SYVN1) interacted with MSH3 and promoted its ubiquitination and degradation. Of note, the expression and function of SYVN1 were contrary to those of MSH3 and SYVN1 regulated MSH3 protein degradation via the ubiquitin-proteasome pathway and the autophagy-lysosome pathway. Based on these findings, we propose a mechanism for ARC pathogenesis that involves SYVN1-mediated degradation of MSH3 via the ubiquitin-proteasome pathway and the autophagy-lysosome pathway, and suggest that interventions targeting SYVN1 might be a potential therapeutic strategy for ARC.
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