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- W3040090305 abstract "microRNAs (miRNAs) are important regulators of cellular homeostasis and exert their effect by directly controlling protein expression. We have previously reported an age-dependent negative association between microRNA-99b (miR-99b-5p) expression and muscle protein synthesis in human muscle in vivo. Here we investigated the role of miR-99b-5p as a potential negative regulator of protein synthesis via inhibition of mammalian target for rapamycin (MTOR) signaling in human primary myocytes. Overexpressing miR-99b-5p in human primary myotubes from young and old subjects significantly decreased protein synthesis with no effect of donor age. A binding interaction between miR-99b-5p and its putative binding site within the MTOR 3′-untranslated region (UTR) was confirmed in C 2 C 12 myoblasts. The observed decline in protein synthesis was, however, not associated with a suppression of the MTOR protein but of its regulatory associated protein of mTOR complex 1 (RPTOR). These results demonstrate that modulating the expression levels of a miRNA can regulate protein synthesis in human muscle cells and provide a potential mechanism for muscle wasting in vivo." @default.
- W3040090305 created "2020-07-10" @default.
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- W3040090305 date "2020-08-01" @default.
- W3040090305 modified "2023-10-17" @default.
- W3040090305 title "MicroRNA-99b-5p downregulates protein synthesis in human primary myotubes" @default.
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- W3040090305 doi "https://doi.org/10.1152/ajpcell.00172.2020" @default.
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