诱导性一氧化氮合酶抑制药对内毒素处理鼠主动脉和肺动脉的影响

Effects of aminoguanidine on endotoxin-treated rat aorta and pulmonary artery in vitro

目的:观察比较iNOS抑制药AG对鼠离体主动脉和肺动脉环张力的影响。方法:测定血管对NE的量-效反应,在LPS(300ng/ml)中孵育4小时后。分为L-NAME(300μmol/L)或AG(100μmol/L)孵育60或20分钟共8组。结果:LPS孵育后动脉环对NE的反应明显降低,给予L-NAME或AG后均升高以10^(-6)mol/L NE作比较,L-NAME组主动脉20分钟时反应性明显高于AG组。L-NAME组肺动脉较AG组明显升高(P<0.01)。AG60分钟组主动脉升高的幅度明显大于肺动咏组(P<0.01)。L-NAME引起的血管收缩高峰时间较AG组出现的早,且峰值高。结论:L-NAME和AG部可增加已降低的对NE的反应性;但AG仅使主动脉环的敏感性明显增加。

Objective: To investigate the effects of selective NOS inhibitor aminoguanidine (AG) on endotoxintreated rat aorta (AO) and pulmonary artery (PA) in vitro. Method: The reaction to noradrenaline (NE) (10^(-9)-10^(-4)mmol/L) was measured in the vessels with complete endothelium, then the vessels were divided into 8 groups after incubated in LPS(300ng/ml)for 4 hours. Each group was incubated with AG(100μmol/L)or L-NAME (300μmol/L)for 20, or 60min, respectively. Result: Both AO and PA showed hyporeaetivity to NE after incubated in LPS. and the reactivity of AO and PA to L-NAME and AG increased significantly after incubated in them for 60min or 20min. The sen sitivities of AO to AG,AO and PA to L-NAME increased greatly. AO had a higher reactivity to AG in 60min than in 20min. L-NAME caused earlier and greater contraction than AG in both 60 min and 20 min groups. Conclusion: LNAME and AG can both increase the decreased reactivities of AO and PA to NE. AG only increases the AO sensitivity.