出 处:《中华实验外科杂志》2011年第8期1247-1249,共3页Chinese Journal of Experimental Surgery
摘 要:目的探讨缺血后处理(IPO)对大鼠在体肺缺血一再灌注损伤(I/R)的保护作用及线粒体ATP敏感性钾通道(mitoKATP)在缺血后处理效应中的作用。方法将Wistar大鼠35只随机分为5组:假手术组(Sham组)、缺血再灌注损伤组(I/R组)、缺血后处理组(IPO组)、缺血再灌注损伤+5.羟基葵酸盐组(I/R+5-HD组)、缺血后处理+5-羟基葵酸盐组(IPO+5-HD组)。观察各组肺组织中丙二醛(MDA)含量、超氧化物歧化酶(SOD)活性、湿/干比值(W/D)以及病理形态学改变。结果I/R组与Sham组比较MDA含量增加[(5.07±1.60)nmol/mgprot比(1.43±0.41)nmol/mg prot,P〈0,01],SOD活性减低[(12.38±2.24)U/mg prot比(45,51±5.42)U/mg prot,P〈0.01],W/D比值增高(5.45±0.82比3.05±0.47,P〈0.01),肺组织形态及超微结构明显受损;IPO+5-HD组与IPO组比较MDA含量增加[(3.74±0.71)nmol/mgprot比(2.60±0.43)nmol/mgprot,P〈0.01],SOD活性减低[(22.91±2.71)U/mg prot比(28.74±2.03)U/mg prot,P〈0.01],W/D比值增高(4.64±0.79比3.89±0.60,P〈0.01),肺组织形态及超微结构明显受损;IPO组与I/R组比较,肺组织MDA含量减少[(2.60±0.43)nmol/mgprot比(5.07±1.60)nmol/mg prot,P〈0.01],SOD活性增高[(28.74±2.03)U/mg prot比(12.38±2.24)U/mg prot,P〈0.01],W/D比值减低(3.89±0.60比5.45±0.82,P〈0.01),肺组织病理形态学改变轻于I/R组;I/R+5-HD组与I/R组比较,肺组织MDA含量[(5.14±1.30)nmol/mg prot比(5.07±1.60)nmol/mg prot,P〉0.05)、SOD活性[(11.65±1.82)U/mg prot比(12.38±2.24)U/mg prot,P〉0.05]、W/D比变化(5.544-0.61比5.45±0.82),差异无统计学意义(P〉0.05),肺组织病理形态学改变无明显差异。IPO�Objective To investigate the protective effect of ischemic postconditioning (IPO) on lung ischemic reperfusion (I/R) in rats in vivo and the mechanism of mitochondrial ATP-sensitive potassi- um channel (mitoKATP) blocker in the ischemic postconditioning. Methods Thirty five Wistar rats were randomly divided into 5 groups: sham group, I/R group, ischemic postconditioning (IPO) group, I/R + 5-hydroxydecanoate (I/R + 5-HD ) group, IPO + 5-HD group. The concentration of malondialdehyde (MDA) and activity of superoide dismutase (SOD) were determined in the lung homogenate, wet to dry weight ratio (W/D) was measured and pathological changes were also observed. Results The levels of MDA [(5.07+_1.60) vs (1.43 +-0.41) nmol/mgprot,P〈0.01] and W/D (5.45 +0.82 vs 3.05 + 0. 47, P 〈 0. 01 ) were increased significantly in I/R group as compared with sham group, while the activity of SOD [ ( 12. 38 ± 2. 24) vs (45.51± 5.42) U/mg prot, P 〈 0. 01 ] was decreased, and the injury of lung tissues was significantly aggravated in IPO + 5-HD group as compared with IPO group [ MDA : ( 3.74 ±0. 71 ) nmol/mg prot vs (2. 60 ±0. 43 ) nmol/mg prot , P 〈 0. 01 ] ; W/D : 4. 64 ± 0. 79 vs 3.89 ± 0. 60, P〈0.01; SOD: [(22.91±2.71) U/mgprotvs (28.74±2.03) U/mgprot,P〈0.01]. The levels of MDA [(2.60±0.43) vs (5.07±1.60) nmol/mgprot,P〈0.01] and W/D (3.89±0.60 vs5.45±0. 82,P 〈0. 01 ) were decreased significantly in IPO group as compared with I/R group, the activity of SOD [ (28.74 ± 2. 03 ) vs ( 12. 38 ± 2. 24 ) U/mg prot, P 〈 0. 01 ] increased and lung tissue histological damage attenuated. The difference in MDA [ (5. 14 ± 1.30) vs (5.07 ± 1.60) nmol/mg prot,P 〉0. 05], W/D (5.54±0.6l vs5.45±0.82,P〉0.05) and SOD [(11.65 ±1. 82) vs (12.38 ±2.24) U/rag prot, P 〉 0. 05 ] levels had no statistical significance between I/R + 5-HD group and IIR group, and the injury of lung tissues
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