目的 探讨督脉灸改善骨骼肌衰老的泛素蛋白酶体途径机制。方法 Sprague-Dawley大鼠30只随机分为空白组、模型组和督脉灸组各10只。模型组和督脉灸组每天颈背部皮下注射D-半乳糖125 mg/kg,共6周,空白组皮下注射等量生理盐水。随后督脉灸组艾灸大椎穴至腰俞穴之间督脉,每天20 min,共20 d。剥离双侧竖脊肌,Western blotting检测泛素、肌环指蛋白1 (MuRF1)、肌萎缩F-box蛋白(MAFbx)蛋白水平。结果 与空白组相比,模型组泛素、MuRF1、MAFbxD-半乳糖蛋白表达升高(P<0.05);与模型组相比,督脉灸组泛素、MuRF1和MAFbx蛋白表达下降(P<0.05)。结论 督脉灸可通过对泛素蛋白酶体途径的调控,减少蛋白降解,延缓骨骼肌萎缩。
关键词：
督脉灸; 骨骼肌; 衰老; 泛素; 大鼠
Objective To study the role of ubiquitin proteasome pathway in Du Meridian moxibustion for skeletal muscle aging. Methods A total of 30 Sprague-Dawley rats were randomly separated into control group (n=10), model group (n=10) and moxibustion group (n=10). The model group and the moxibustion group were subcutaneously injected D-galactose 125 mg/kg daily for six weeks, while the control group was injected the same volume of saline. Then the moxibustion group was cauterized on Du Meridian 20 minutes a day for 20 days. The expression of ubiquitin, muscle RING finger 1 (MuRF1) and muscle atrophy F-box (MAFbx) in erector spinae were tested with Western blotting. Results The expression of ubiquitin, MuRF1 and MAFbx increased in the model group compared with that of the control group (P<0.05), decreased in the moxibustion group compared with that of the model group (P<0.05).Conclusion The Du Meridian moxibustion may regulate ubiquitin proteasome pathway to inhibit the degradation of protein, and delay muscular atrophy.
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