褪黑素和己酮可可碱减缓肝缺血再灌注损伤的实验研究

Effects of melatonin and pentofylline on hepatic ischemia-reperfusion injury

目的 探讨褪黑素 (MT)和己酮可可碱 (PTX)对肝脏缺血再灌注损伤的保护作用。方法 12 8只SD大鼠随机分为4组 :对照组、MT组、PTX组及MT与PTX联合组。所有大鼠均在阻断第一肝门 35min后恢复入肝血流 ,其间行肝左外叶切除。测定缺血前、后及再灌注时的血清ALT、LDH、TNF α、肝组织MDA、SOD及ET 1的含量 ;并观察大鼠一周的生存率。结果 ①肝功能 :各组ALT和LDH值均明显升高 ,但用药组的上升幅度明显低于对照组 ,且以联合用药组的降低更为明显 ;②ET 1:各组ET 1值均明显增加 ,但用药组的升高幅度明显低于对照组 ;③MT疗效 :各组MDA及SOD均明显增加 ,但MT使用组 (含MT组和联合组 )的升高幅度较其它组别明显降低 ;④PTX疗效 :各组TNF α值均明显升高 ,但PTX使用组 (含PTX组及联合组 )的升高幅度明显低于其它组别 ,且生存率较其它组别明显增加。结论 ①MT可降低脂质过氧化程度 ,但对提高生存率无明显作用 ;②PTX可减轻炎性细胞因子释放、提高生存率 ;③联合应用MT和PTX可显著减轻肝功能损害 ,提高大鼠生存率。

Aim To investigate the effect of melatonin (MT) and pentoxifylline (PTX) on hepatic ischemia reperfusion (I/R) in rat. Methods 128 rats were randomly divided into four groups: control group, MT treated group, PTX treated group and PTX+MT group (combined group). Those operation procedures including occlusion the inflow to the liver 35 minutes, hepatectomy and reperfusion, were underwent by the animals. The following items were investigated: liver function, endothelin 1 (ET 1), malondialdehyde (MDA), superoxide dismutase (SOD), and one week survival. Results The following changes were detected after the liver ischemia: ①Liver function: the increased scopes of ALT and LDH were significantly lower in treatment groups, especially in the combined group than that in control one; ②ET 1: the levers of ET 1 were significantly increased in every group, especially the control group; ③MT function: the increased scopes of MDA and SOD were significantly lower in MT groups (including MT treated and combined groups) than that in others; ④PTX function: the increased scopes of TNF α were significantly lower in PTX groups (including PTX treated and combined groups) with a higher rate of survival than that in others. Conclusion ①MT could reverse the oxidative damage, but cannot affect the rate of survival; ②PTX can decrease the secretion of cytokine and the one week survival; ③Based on the synergistic effects, the application of MT+PTX may have beneficial effects against the I/R injury to increase the survival.