Abstract：
:Tumor necrosis factor receptor-associated factor 6 (TRAF6), a unique E3 ubiquitin ligase and adaptor protein, is involved in activation of various signaling cascades. Recent studies identify TRAF6 as one of the novel regulators of skeletal muscle atrophy. The role of TRAF6 in glucocorticoid-induced muscle atrophy, however, remains to be elucidated. In this study, we show that TRAF6 and its downstream signaling molecules, muscle atrophy F-box (MAFBx) and muscle ring finger 1 (MuRF1), were all upregulated in dexamethasone-induced atrophy of mouse C2C12 myotubes or mouse tibialis anterior (TA) muscle. To further investigate the role of TRAF6 in dexamethasone-induced muscle atrophy, TRAF6-siRNA was used to transfect cultured C2C12 myotubes or was injected into the TA muscle of mice respectively, and we note that TRAF6 knockdown attenuated dexamethasone-induced muscle atrophy in vitro and in vivo, and concomitantly decreased the expression of MuRF1 and MAFBx. Our findings suggest that a decreased expression of TRAF6 could rescue dexamethasone-induced skeletal muscle atrophy through, at least in part, regulation of the expression of MAFBx and MuRF1.
journal_name
Int J Mol Scijournal_title
International journal of molecular sciencesauthors
Sun H,Gong Y,Qiu J,Chen Y,Ding F,Zhao Qdoi
10.3390/ijms150611126subject
Has Abstractpub_date
2014-06-20 00:00:00pages
11126-41issue
6issn
1422-0067pii
ijms150611126journal_volume
15pub_type
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