摘要:
目的 观察乌腺金丝桃与当归配伍对心肌缺血再灌注损伤 (MIRI) 大鼠心肌细胞内Cx43表达及ATP酶活力的影响.方法 采用结扎冠状动脉左前降支的方法制备大鼠MIRI模型, 将大鼠随机分为假手术组、模型组、预处理组、乌腺金丝桃与当归配伍2∶1组 (2∶1组), 在光学显微镜下观测Cx43的分布情况, 并检测心肌细胞中Cx43光密度 (IOD) 均值, 并观察各组ATP酶活力的影响.结果 与模型组比较, 2∶1组可提高心肌组织中Ca2+, Mg2+-ATP酶、Na+, K+-ATP酶活力, 具有显著性差异 (P<0.05), 与模型组比较, 2∶1组Cx43的IOD值升高明显, 组间比较差异有统计学意义 (P<0.05).结论 2∶1组对可以降低缺血再灌注后大鼠心肌的损失, 提高ATP酶的活力, 提高Cx43蛋白及m RNA的IOD值, 其机制与清减轻钙超载、以及增强缝隙连接 (GJ) 通道的传导性和通透性, 减轻其心肌损伤程度达到保护心肌缺血再灌注造成的心肌细胞损伤作用.%Objective To observe the effect of compatibility of Hypericum attenuatum choisy and Salvia on Cx43 expression and ATPase activity in MIRI rats. Methods The rats model of MIRI is established by ligation of the left anterior descending artery of the coronary artery. The rats are randomly divided 2∶1 group, sham group, model group, pretreatment group. The distribution of Cx43 is observed under an optical microscope. The IOD of Cx43 in myocardial cells is measured and the effect of ATPase activity in each group is observed. Results Compared with the model group, 2∶1 group increased the activity of Ca2+, Mg2+-ATPase and Na+, K+-ATPase in myocardium (P <0.05). Compared with the model group, the Cx43 IOD value increased significantly, the difference between the two groups is statistically significant (P <0.05). Conclusion 2: 1 group can reduce the injury in rats, increase the activity of ATPase and increase the protein and m RNA IOD value, the mechanism and clear reduce calcium overload, and enhance the GJ channel of the conductivity and permeability, reduce the degree of injury to protect MIRI.