Abstract
Cigarette smoking has been identified as a risk factor for muscular damage and sarcopenia, the age-related loss of muscle mass and strength in old age. Cigarette smoke (CS)-induced oxidative stress and p38 MAPK activation have been shown to be the main cellular mechanisms leading to skeletal muscle catabolism. In order to investigate the involvement of NF-κB as another possible cellular mechanism by which CS promotes muscle catabolism, C2 myotubes, from an in vitro skeletal muscle cell line, were exposed to different time periods of whole vapor phase CS in the presence or absence of NF-κB inhibitor, IMD-0354. The CS-induced reduction in diameter of myotubes and time-dependent degradation of the main contractile protein myosin heavy chain were abolished by NF-κB inhibition. Also, C2 exposure to CS resulted in IκB-α degradation and NF-κB activation, which led to upregulation of the muscle specific E3 ubiquitin ligase MuRF1, but not MAFbx/atrogin-1. In conclusion, our results demonstrate that vapor phase CS exposure to skeletal myotubes triggers NF-κB activation leading to skeletal muscle cell damage and breakdown of muscle proteins mediated by muscle specific E3 ubiquitin ligase MuRF1. Our findings provide another possible molecular mechanism for the catabolic effects of CS in skeletal muscle.
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Acknowledgments
Supported by grants from the Rappaport Institute, the Krol Foundation of Barnegat N.J., the Myers-JDC-Brookdale Institute of Gerontology and Human Development, and ESHEL – the association for planning and development of services for the aged in Israel.
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The authors declare no conflicts of interest in relation to this article.
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Kaisari, S., Rom, O., Aizenbud, D., Reznick, A.Z. (2013). Involvement of NF-κB and Muscle Specific E3 Ubiquitin Ligase MuRF1 in Cigarette Smoke-Induced Catabolism in C2 Myotubes. In: Pokorski, M. (eds) Neurobiology of Respiration. Advances in Experimental Medicine and Biology, vol 788. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6627-3_2
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DOI: https://doi.org/10.1007/978-94-007-6627-3_2
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