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【摘要】 目的 探讨重症肌无力(MG)肌肉中与收缩有关的肌球蛋白成分是否减少。方法 用Gubstraub溶液(myosin 提取液) 按常量(匀浆)和微量(浸出)方式提取10名正常人及17例MG患者肌肉的蛋白成分,用双盲法分别以常量及微量聚丙烯酰胺凝胶电泳(SDS-PAGE)方法分析肌肉蛋白成分, 用双向电泳分析有差异的谱带。结果 常量SDS-PAGE电泳图谱分析显示,相对分子质量约25 000的蛋白谱带密度为4.14±1.33,MG患者肌肉为2.02±1.08,差异有非常显著意义(P<0.001);微量分析获得正常肌肉该蛋白谱带的密度为4.26±2.58,MG患者肌肉为1.34±0.79,差异亦有非常显著意义(P<0.001);双向电泳显示,有差异的25 000蛋白略偏碱性,并至少由2个等电点相近的蛋白成分组成。用部分纯化的肌球蛋白鉴定显示,25 000蛋白与肌球蛋白轻链无关。结论 MG患者肌肉中25 000蛋白水平明显低于正常人肌肉,提示该蛋白可能与MG发病或发展有关。
Analysis of protein compon
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