单唾液酸神经节苷脂对体外循环后大鼠脑组织一氧化氮合成酶活性的影响

摘要

目的:研究体外循环(CPB)后脑组织的一氧化氮合成酶(NOS)活性的变化及单唾液酸神经节苷脂(GM1)干预后对其的影响.方法:选用雄性SD大鼠,经右颈静脉插管引流,尾动脉插管灌注建立CPB(CBP组),转流时间l h,建立CPB动物模型.随机分为CPB模型组、CPB模型+ GM1组、输血组和假手术组,每组10只.脑组织匀浆测定结构型一氧化氮合成酶(cNOS)、诱导型一氧化氮合成酶(iNOS)和NO活性.结果:CPB组脑组织中的iNOS活性由正常的(16.47±2.52)pmol/mg·prot-1·min-1增加到(69.84±8.73)pmol/mg·prot-1·min-1(P<0.01),CPB模型+GM1组则增加到(57.86±7.79)pmol/mg·prot-1·min-1(P<0.01),与CPB组比较差异有统计学意义(P<0.05);CPB组脑组织中的cNOS活性由正常的(57.74±8.78)pmol/mg·prot-1·min-1下降到(32.67±6.61)pmol/mg·prot-1·min-1(P<0.01),CPB模型+GM1组则下降到(42.72±7.23)pmol/mg·prot-1(P<0.05),与CPB组比较差异有统计学意义(P<0.05);CPB组脑组织中的NO含量由正常的(258.91±48.17)pmol/mg·prot-1增加到(713.74±98.43)pmol/mg·prot-1(P<0.01),CPB模型+GM1组则增加到(523.74±87.36)pmol/mg·prot-1(P<0.01),与CPB组比较差异有统计学意义(P<0.05).结论:CPB脑损伤与iNOS产生大量的NO导致的神经毒性作用有关;GM1在一定程度降低了脑中活化的iNOS含量,减少了NO的分泌释放,具有一定的脑保护作用.%Objective:To observe the effect of GMX on nitric oxide synthase (NOS), including constitutive nitric oxide synthase (cNOS) and induced nitric oxide synthase (iNOS) following cerebral damage after CPB in rats. Methods: SPF-class adult male SD rats were randomly divided into CPB, CPB+Gmi, transfusion, and sham-operated groups. After establishing a rat model of cardiopulmonary bypass, GMX -with 20 mg/kg -was added to the priming solution. All rats -were anesthetized to collect the -whole cerebral tissues for detecting the activity of cNOS, iNOS and NO content after 24 hours. Results: Compared with the control group, the level of iNOS and NO increased significantly ( P