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KMID : 1204320120280010047
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Laboratory Animal Research
2012 Volume.28 No. 1 p.47 ~ p.54
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Beneficial effects of melatonin on stroke-induced muscle atrophy in focal cerebral ischemic rats
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Lee Seung-Hoon
Shin Jin-Hee
Hong Yun-Kyung
Lee Min-Kyung
Kim Koo
Lee Sang-Rae
Chang Kyu-Tae
Hong Yong-Geun
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Abstract
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Muscle atrophy is the result of two opposing conditions that can be found in pathological or diseased muscles: an imbalance in protein synthesis and degradation mechanisms. Thus, we investigated whether exogenous melatonin could regulate muscle components in stroke-induced muscle atrophy in rats. Comparing muscle phenotypes, we found that long-term melatonin administration could influence muscle mass. Muscle atrophy-related genes, including muscle atrophy F-box (MAFbx) and muscle ring finger 1 (MuRF1) were significantly down-regulated in melatonin-administered rats in the gastrocnemius. However, only MAFbx at the mRNA level was attenuated in the soleus of melatonin-administered rats. Insulin-like growth factor-1 receptor (IGF-1R) was significantly over-expressed in melatonin-administered rats in both the gastrocnemius and soleus muscles. Comparing myosin heavy chain (MHC) components, in the gastrocnemius, expression of both slow- and fast-type isoforms were significantly enhanced in melatonin-administered rats. These results suggest that long-term exogenous melatonin-administration may have a prophylactic effect on muscle atrophy through the MuRF1/MAFbx signaling pathway, as well as a potential therapeutic effect on muscle atrophy through the IGF-1-mediated hypertrophic signaling pathway in a stroke animal model.
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KEYWORD
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Melatonin, muscle atrophy, focal cerebral ischemia
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