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http://dx.doi.org/10.5352/JLS.2017.27.12.1479

Induction of Muscle Atrophy by Dexamethasone and Hydrogen Peroxide in Differentiated C2C12 Myotubes  

Park, Cheol (Department of Molecular Biology, College of Natural Sciences, Dongeui University)
Jeong, Jin-Woo (Anti-Aging Research Center and Blue Bio Industry RIC, Dongeui University)
Choi, Yung Hyun (Anti-Aging Research Center and Blue Bio Industry RIC, Dongeui University)
Publication Information
Journal of Life Science / v.27, no.12, 2017 , pp. 1479-1485 More about this Journal
Abstract
Muscle atrophy due to aging, starvation, and various chronic diseases leads to a decrease in muscle fiber area and density due to reduced muscle protein synthesis and increased protein breakdown. This study investigated the effect of dexamethasone and hydrogen peroxide on the induction of muscle atrophy and expression of atrophy-related genes in differentiated C2C12 myotubes. C2C12 myoblasts were differentiated into myotubes in differentiation medium. During myoblast differentiation, muscle-specific transcription factors, such as myogenin, and MyoD expression increased. Differentiated C2C12 myotubes exposed to noncytotoxic levels of dexamethasone and hydrogen peroxide showed a decrease in myotube diameter, which was associated with up-regulation of muscle-specific ubiquitin ligases, such as muscle atrophy F-box (MAFbx)/atrogin-1 and muscle RING finger-1 (MuRF1), and down-regulation of myogenin and MyoD. These results demonstrated that dexamethasone and hydrogen peroxide induced atrophy through regulation of muscle-specific ubiquitin ligases and muscle-specific transcription factors in C2C12 myotubes. In this study, we confirmed the process of differentiation of C2C12 myoblasts into myotubes in in vitro experiments in the presence of atrophy. This muscle atrophy model of C2C12 cells induced by dexamethasone or hydrogen peroxide seems suited to studies of the mechanism of muscle atrophy suppression and to exploit the experiment for excavating new muscle atrophy.
Keywords
C2C12 myotubes; dexamethasone; hydrogen peroxide; muscle atrophy;
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