杜鹃花总黄酮药理性预处理对大鼠心肌缺血/再灌注损伤中炎症反应的影响

Protective effect of total flavones of rhododendra pharmacological preconditioning against inflammation of rat myocardium induced by ischemia and reperfusion injury

目的观察杜鹃花总黄酮(total flavones of rhododendra,TFR)药理性预处理对大鼠心肌缺血/再灌注损伤的保护作用及其对心肌细胞炎症反应的影响。方法在Langen-dorff离体灌流大鼠心脏,采用停灌K-H液30min后再灌注40min的方法制备大鼠心肌缺血/再灌注损伤模型。TFR药理性预处理(TFR pharmacological preconditioning,TFR-PP)大鼠心脏,在缺血前灌注含TFR的K-H液5min,然后用不含TFR的K-H液灌注5min,如此反复,共3次。观察心肌组织病理学损伤,心肌组织中肌酸激酶(CK)、乳酸脱氢酶(LDH)及髓过氧化物酶(MPO)活力的变化,心肌组织中核因子-κB(NF-κB)、肿瘤坏死因子-α(TNF-α)、细胞间粘附分子-1(ICAM-1)的表达。结果在Langendorff离体灌流模型中,TFR-PP(50、100mg.L-1)可明显抑制缺血/再灌注大鼠心肌组织中CK和LDH活性的降低,同时能明显改善心肌组织病理学损伤;TFR-PP(25、50、100mg·L-1)能不同程度的抑制心肌组织中MPO的增加及NF-κB、TNF-α、ICAM-1的表达。结论TFR药理性预处理对大鼠离体心脏缺血/再灌注损伤有明显保护作用,其作用可能与抑制心肌细胞炎症反应有关。

Aim To study the protective effect of total flavones of rhododendra pharmacological preconditioning（TFR-PP） on myocardial ischemia and reperfusion injury and its mechanisms involved in myocardial inflammation in rats. Methods In model group the isolated perfused rat hearts set up by Langendorff system were subjected to 30 min ischemia followed by 40 min reperfusion. The hearts in TFR-PP groups were subjected to three cycles of 5 rain perfusion with and without TFR before 30 min ischemia followed by 40 min reperfusion. In all groups the activities of lactate dehydrogenase （LDH）, creatine phosphokinase （CK）, and myeloperoxidase （MPO） in myocardium, the expressions of nuclear factor-kappa B （NF-κB） , tumor necrosis factor-alpha（TNF-α） , and intercellular adhersion molecule-1 （ICAM-1） were measured, and the myocardial pathomorphological changes were examined. Results TFR-PP（25,50,100 mg · L^-1） could inhibit markedly the reductions of LDH and SOD activities in myocardium induced by ischemia and reperfusion injury, 100 mg · L^-1 TFR-PP also significantly improved the pathomorphological changes of injury. TFR-PP （25,50,100 mg· L^-1） could inhibit the expressions of NF-κB, TNF-α and ICAM-1 to varying degrees. Conclusion TFR-PP has marked protective effect on ischemia and reperfusion injury in isolated rat heart via inhibiting the inflammation of myocardium.