中药双黄补对体外培养人牙周膜细胞增殖活性的影响

背景：目前的研究大多为单味中药或单一中药成分对体外培养人牙周膜细胞的影响,而中药组方提取液对体外培养细胞影响的研究较少。目的：观察中药双黄补对体外培养的人牙周膜细胞增殖活性的影响。设计、时间及地点：对比观察实验,于2008-11/2009-02 在河北医科大学第四医院科研中心完成。材料：人牙周膜细胞组织选自河北医科大学第四医院口腔科要求手术拔除的埋伏多生牙者。黄连、黄芩、骨碎补均购自河北医科大学第四医院中药房。方法：采用组织块法体外培养人牙周膜细胞。水提醇沉法制备双黄补提取液。以每 1 mL药液含生药 1 g加入体积分数20%的胎牛血清培养液,稀释成质量浓度为10,25,50,100,150,200,250,500,750,1 000 mg/L,分别作用于体外培养的人牙周膜细胞,以不加双黄补提取液的培养细胞为对照。主要观察指标：采用四甲基偶氮唑蓝法测定培养细胞增殖活性的变化,应用流式细胞术检测100 mg/L的双黄补提取液对牙周膜细胞周期的变化和对成纤维细胞生长因子18水平的影响。结果：双黄补对人牙周膜细胞的增殖活性的影响存在质量浓度和时间效应,各质量浓度双黄补均能促进体外培养人牙周膜细胞的增殖活性,其中以100 mg/L质量浓度促增殖活性作用最明显(P < 0.01),相同质量浓度不同作用时间对细胞促增殖活性作用也不同,以48 h作用最明显(P < 0.05)。与对照组相比,100 mg/L的双黄补促进牙周膜细胞成纤维细胞生长因子18水平增高,S期和G2M期细胞数目增多,在48 h最明显。结论：中药双黄补可增强人牙周膜细胞的增殖活性,具有明显的浓度效应和时间效应。     

Does the severity of the LGMD2A phenotype in compound heterozygotes depend on the combination of mutations?

Introduction: Limb‐girdle muscular dystrophy type 2A (LGMD2A) is caused by a deficiency of calpain‐3/p94. Although the symptoms in most LGMD2A patients are generally homogeneous, some variation in the severity and progression of the disease has been reported. Methods: We describe 2 patients who carry the same combination of compound heterozygous mutations (pG222R/pR748Q) and whose symptoms are exceptionally benign compared to homozygotes with each missense mutation. Results: The benign phenotype observed in association with the combined pG222R and pR748Q mutations suggested that it may result from a compensatory effect of compound heterozygosity rather than the individual mutations themselves. Our analyses revealed that these two mutations exert different effects on the protease activity of calpain‐3, suggesting “molecular complementation” in these patients. Conclusion: We propose several hypotheses to explain how this specific combination of mutations may rescue the normal proteolytic activity of calpain‐3, resulting in an exceptionally benign phenotype. Muscle Nerve, 2011