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2015 ; 2015
(ä): 684965
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Myostatin Activates the Ubiquitin-Proteasome and Autophagy-Lysosome Systems
Contributing to Muscle Wasting in Chronic Kidney Disease
#MMPMID26448817
Wang DT
; Yang YJ
; Huang RH
; Zhang ZH
; Lin X
Oxid Med Cell Longev
2015[]; 2015
(ä): 684965
PMID26448817
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Our evidence demonstrated that CKD upregulated the expression of myostatin,
TNF-?, and p-IkBa and downregulated the phosphorylation of PI3K, Akt, and FoxO3a,
which were also associated with protein degradation and muscle atrophy. The
autophagosome formation and protein expression of autophagy-related genes were
increased in muscle of CKD rats. The mRNA level and protein expression of MAFbx
and MuRF-1 were also upregulated in CKD rats, as well as proteasome activity of
26S. Moreover, activation of myostatin elicited by TNF-? induces C2C12 myotube
atrophy via upregulating the expression of autophagy-related genes, including
MAFbx and MuRF1 and proteasome subunits. Inactivation of FoxO3a triggered by PI3K
inhibitor LY294002 prevented the myostatin-induced increase of expression of
MuRF1, MAFbx, and LC3-II protein in C2C12 myotubes. The findings were further
consolidated by using siRNA interference and overexpression of myostatin.
Additionally, expression of myostatin was activated by TNF-? via a NF-?B
dependent pathway in C2C12 myotubes, while inhibition of NF-?B activity
suppressed myostatin and improved myotube atrophy. Collectively, myostatin
mediated CKD-induced muscle catabolism via coordinate activation of the autophagy
and the ubiquitin-proteasome systems.