趋化肽对兔血管条的松弛作用:非内皮源一氧化氮释放的证据。

Blood vessels Pub Date : 1991-01-01 DOI:10.1159/000158892
E Petitclerc, F Marceau
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引用次数: 6

摘要

两种不同的肽,C5a和f-Met-Leu-Phe (FMLP),对吞噬白细胞具有趋化作用,深刻影响体内各种系统的循环。已知这些肽能使兔离体血管、门静脉和肺动脉松弛。在本研究中,我们检测了重组人C5a (2.5-25 nM)的效果,发现其质量与先前报道的FMLP相似。吲哚美辛完全或部分抑制两种肽分别在肺动脉和门静脉引起的血管松弛。C5a诱导的舒张并没有通过去除模型血管内皮而消除。连续暴露于环己亚胺的组织中,C5a或FMLP的作用更强;这种现象在马解阵线中尤为明显。研究了两种肽对门静脉舒张的抗吲哚美辛作用。该成分不受辣椒素预处理和内皮去除的抑制,但被ng -硝基- l -精氨酸抑制或被LY-83583还原。这些结果表明,趋化肽对兔血管平滑肌的机械作用是通过释放与内皮细胞无关的次级介质引起的;这些介质暂定为前列腺素和一氧化氮。代谢途径的协调组合参与了最终的反应,血管来源和使用的激动剂之间存在固有差异。
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Relaxant effect of chemotactic peptides on rabbit vascular strips: evidence for nitric oxide release from a nonendothelial source.

Two distinct peptides, C5a and f-Met-Leu-Phe (FMLP), that are chemotactic for phagocytic leukocytes affect profoundly the circulation in various in vivo systems. These peptides are known to relax strips of rabbit isolated blood vessels, the portal vein and pulmonary artery. In the present study, the effect of recombinant human C5a (2.5-25 nM) was examined and found to be qualitatively similar to that previously reported for FMLP. Indomethacin completely or partially inhibited the vasorelaxations induced by either peptide in the pulmonary artery and the portal vein, respectively. The relaxation induced by C5a was not abolished by removing the endothelial lining of the model vessels. The C5a or FMLP effects were more tachyphylactic in tissues continuously exposed to cycloheximide; this phenomenon was particularly pronounced for FMLP. A series of experiments were focused on the indomethacin-resistant component of the relaxation induced by either peptide on the portal vein. This component was not inhibited by capsaicin pretreatment or by endothelium removal, but was suppressed by treatment with NG-nitro-L-arginine or reduced by LY-83583. These findings suggest that the chemotactic peptides elicit their mechanical effect on rabbit vascular smooth muscle through the release of secondary mediators not related to the endothelium; the mediators are tentatively identified as prostaglandins and nitric oxide. It is the coordinated combinations of the metabolic pathways that are involved in the final responses, with inherent differences between vessel sources and the agonists used.

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