摘要
目的 :观察肢体缺血再灌注致肺损伤时肺组织中一氧化氮 (NO)及过氧亚硝基阴离子 (ONOO-)的变化 ,以探讨二者在此种损伤中的作用。方法 :采用夹闭大鼠腹主动脉下段造成双下肢缺血和再灌注后肺损伤模型 ,分别测定假手术组、缺血 4h组、缺血 4h再灌注 1h组及再灌注 4h组肺组织匀浆中超氧化物歧化酶 (SOD)活性和丙二醛 (MDA)、NO-2 /NO-3含量变化 ;应用免疫组化方法测定上述各组肺组织中诱导型一氧化氮合酶 (iNOS)及ONOO-体内生成标志物硝基酪氨酸 (NT)的变化。结果 :肢体缺血再灌注后 1h和 4h肺组织中MDA和NO-2 /NO-3的含量显著高于对照组和单纯缺血组 (P <0 .0 5 ) ,而SOD活性则显著低于此两组 (P <0 .0 5 ) ,并出现大量iNOS及NT阳性信号。结论 :肢体缺血再灌注致肺损伤时肺组织中有大量NO和ONOO-产生 ,脂质过氧化增强 ,提示ONOO-参与介导此种肺损伤。
AIM: To observe the changes in nitric oxide(NO) and peroxynitrite anion (ONOO - ) in the injuried lung following the ischemia-reperfusion of hind limbs and evaluate the contribution of NO and ONOO - to tissue injury. METHODS: A model of hind limbs ischemia was made by clamping infrarenal aorta with a microvascular clip and lung injury occurring after reperfusion. Lung tissue was obtained from the animals received sham operation(group 1),4 hours ischemia without reperfusion(group2), 1 hour reperfusion following 4 hours ischemia (group3) and 4 hours reperfusion following 4 hours ischemia (group4) . The contents of MDA, NO - 2/NO - 3 and the activities of SOD in the lung were examined. Immunohistochemical technique was used to determine the immunoreactivity to iNOS and nitrotyrosine(NT)-a specific 'footprint' of peroxynitrite. RESULTS: Compared with group1 and group2,the contents of MDA and NO - 2/NO - 3 increased significantly (P<0.05) and the activities of SOD decreased markedly(P<0.05) in group3 and group4.Immunohistochemical examination demonstrated intense staining for iNOS and NT throughout the lung in group3 and group4. CONCLUSION: NO and ONOO - are involved in oxidant-mediated lung injury following reperfusion of ischemic hind limbs.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2001年第2期158-160,T001,共4页
Chinese Journal of Pathophysiology
关键词
一氧化氮
阴离子
四肢
肺
再灌注损伤
Nitric oxide
Anions
Extremities
Lung
Reperfusion injury
