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miR-491 inhibits skeletal muscle differentiation through targeting myomaker.

Arch. Biochem. Biophys.2017 Jul 01;625-626:30-38. Epub 2017 Jun 01
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摘要


The myogenesis of skeletal muscle has several stages, including satellite cell proliferation, differentiation, fusion and specific muscle formation. Recent studies have shown that myomaker, a muscle-specific transmembrane protein, was critical for myoblasts fusion. However, the regulatory mechanism of myomaker and its effects on myogenesis remain elusive. In this study, miR-491 was identified as a post-transcriptional regulator of myomaker, which binds specifically to its 3' untranslated region leading to its down-regulation. At the end of myotube differentiation, the expression levels of miR-491 increased drastically, while myomaker was significantly down-regulated, which indicated that miR-491 shut down the expression of myomaker. Functional studies showed that miR-491 overexpression suppressed muscle cell differentiation and adult muscle regeneration, while the inhibition of miR-491 promoted myotube differentiation. Taken together, our findings identified miR-491 as a novel negative regulator of myogenic differentiation through targeting myomaker.

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