首页> 外文期刊>Endothelium: Journal of endothelial cell research >Effects of chronic nitric oxide synthase inhibition on endothelium-dependent and -independent relaxation in arteries that perfuse skeletal muscle of swine.
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Effects of chronic nitric oxide synthase inhibition on endothelium-dependent and -independent relaxation in arteries that perfuse skeletal muscle of swine.

机译:慢性一氧化氮合酶抑制作用对灌注猪骨骼肌动脉的内皮依赖性和非依赖性松弛的影响。

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摘要

The purpose of this investigation was to test the hypothesis that chronic N(G)-nitro-l-arginine methyl ester (l-NAME) treatment produces differential effects on conduit artery and resistance arteriole relaxation responses to endothelium-dependent and -independent vasodilators in arteries that perfuse skeletal muscle of swine. To test this hypothesis, conduit skeletal muscle arteries and second-order skeletal muscle (2A) arterioles were harvested from 14 Yucatan swine that were chronically administered l-NAME and from 16 controls. In vitro assessments of vasorelaxation to increasing doses of acetylcholine (ACH), bradykinin (BK), and sodium nitroprusside (SNP) were performed in both conduit and 2A arterioles. l-NAME treatment produced a significant reduction in both BK and ACH relaxation responses in the conduit arteries. In contrast, the relaxation response and/or sensitivity to SNP were significantly greater in the intact, but not denuded, conduit arterial rings from chronically l-NAME-treated swine. There were no significant effects of chronic l-NAME treatment on vasodilation of skeletal muscle arterioles. These findings suggest (1) that unlike arterioles, skeletal muscle conduit arteries do not functionally compensate for a lack of NO through the upregulation of alternative vasodilator pathways; (2) that the greater relaxation response in conduit arteries of chronically l-NAME-treated swine to SNP can be explained by alterations to the endothelium.
机译:这项研究的目的是检验以下假设,即长期N(G)-硝基-1-精氨酸甲酯(l-NAME)治疗对导管动脉和抵抗小动脉松弛反应的内皮依赖性和非依赖性血管舒张剂产生不同的影响。灌注猪骨骼肌的动脉。为了检验该假设,从长期施用l-NAME的14头尤卡坦猪和16只对照中收获了导管骨骼肌动脉和二级骨骼肌(2A)小动脉。在导管和2A小动脉中进行了血管舒张以增加剂量的乙酰胆碱(ACH),缓激肽(BK)和硝普钠(SNP)的体外评估。 l-NAME治疗显着降低了导管动脉的BK和ACH松弛反应。相反,在长期但未剥夺的经慢性l-NAME治疗的猪的导管动脉环中,其松弛反应和/或对SNP的敏感性明显更高。长期的l-NAME治疗对骨骼肌小动脉的血管舒张没有显着影响。这些发现提示(1)与小动脉不同,骨骼肌导管动脉无法通过上调替代性血管舒张剂途径功能性补偿NO缺乏; (2)长期用I-NAME处理的猪对SNP的导管动脉舒张反应更大,可以通过改变内皮来解释。

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