【摘要】 目的:观察败血症休克大鼠主动脉外膜L-精氨酸(L-Arg)转运,一氧化氮合酶(NOS)活性和一氧化氮(NO)生成的变化。方法:雄性Wistar大鼠盲肠结扎并穿孔复制败血症休克模型。测定大鼠主动脉外膜亚硝酸盐(NOx)含量、一氧化氮合酶(NOS)活性及L-精氨酸(L-Arg)转运;RT-PCR方法测定诱导型一氧化氮合酶(iNOS)mRNA水平。结果:严重感染休克大鼠呈现严重的血流动力学紊乱,心功能抑制。败血症休克大鼠表现为严重的低血糖和高乳酸血症。血管外膜iNOS的mRNA水平均明显高于假手术组(均P<0.01),主动脉外膜NOx生成、NOS活性及L-Arg转运速率显著高于假手术组(P<0.01)。结论:败血症休克时血管外膜L-Arg/NOS/NO系统激活在败血症休克发病中可能起重要作用。更多还原

【Abstract】 AIM: In this study, we aimed to explore the alteration and pathophysiological significance of the L-arginine (L-Arg)/NOS/NO pathway in the adventitia of rats with sepsis. METHODS: Sepsis was induced by cecal ligation and puncture (CLP). Rat cardiac function was determined. NO generation, NOS activity and L-Arg transport were measured. The iNOS mRNA levels was determined by using RT-PCR. RESULTS: Cecal ligation and puncture induced severe sepsis with severe low glucose, high lacticemia and cardiac function inhibition. The iNOS activity was increased by 2.8-fold compared with controls (P<0.01) and the iNOS mRNA level was elevated-6-fold (P<0.01). The NO level in plasma and incubation media (incubation for 40 min) in the sepsis group was increased by 144% and 273% (both P<0.01), respectively. CONCLUSION: The results demonstrated that the L-Arg,NOS/NO pathway was activated in vascular adventitia of rats with sepsis shock. The aortic adventitia L-Arg/NOS/NO pathway might play an important role in the pathogenesis of sepsis and septic shock.更多还原