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• W2108074434 abstract "Ubiquitin-specific proteases (USPs) deubiquitinate ubiquitin-protein conjugates in the ubiquitin-proteasome system. Previous research shows that ubiquitin-specific protease-19 (USP-19) is up-regulated in mammalian skeletal muscle in some degradative conditions, such as including fasting, diabetes, dexamethasone treatment, and cancer, and its function is associated with muscle atrophy. However, it is still unclear whether USP-19 is involved in muscle atrophy induced by chronic obstructive pulmonary disease. Rats exposed to chronic cigarette smoke and L6 myotubes incubated with cigarette smoke extract (CSE) were studied here. Using western blot analysis and quantitative real-time polymerase chain reaction (qPCR), we observed over-expression of USP-19 and down-regulation of myosin heavy chain (MHC) in both models. Moreover, CSE exposure inhibited myogenic differentiation and myotube formation in L6 myotubes. To explore the mechanism underlying these effects, we investigated the levels of phosphorylated mitogen-activated protein kinases (MAPKs) and total MAPKs. Exposing myotubes to CSE resulted in the general activation of MAPKs such as p38, JNK, and ERK1/2. The ERK inhibitor PD98059 and the p38 inhibitor SB203580 significantly blocked the increase in USP-19 gene expression induced by CSE. Our findings suggest that USP-19 is associated with muscle atrophy in response to cigarette smoke and is a potential therapeutic target. CSE promotes myotube wasting in culture partly by inhibiting myogenic differentiation and acts via p38 and ERK MAPK to stimulate expression of USP-19 in vitro." @default.
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• W2108074434 date "2011-08-18" @default.
• W2108074434 modified "2023-10-14" @default.
• W2108074434 title "Cigarette smoke-induced skeletal muscle atrophy is associated with up-regulation of USP-19 via p38 and ERK MAPKs" @default.
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• W2108074434 doi "https://doi.org/10.1002/jcb.23151" @default.
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