缺氧性肺动脉高压大鼠血浆3种血管舒张肽的实验研究

Plasma adenomedullin, calcitonin gene-related peptide and c-type natriuretic peptide in rats with hypoxic pulmonary hypertension

目的 探讨缺氧对肾上腺髓质素 (AM)、降钙基因相关肽 (CGRP)和C 型利钠肽 (CNP)合成分泌的影响及它们的相互关系。方法 制备大鼠缺氧性肺动脉高压模型 ,分为缺氧 10、2 0、3 0d组和平原对照组 ,分别测量肺动脉压力和右心室收缩最大上升速率。应用放射免疫法检测血浆中AM、CGRP和CNP含量的动态变化。结果 缺氧促进实验大鼠肺动脉压和右心室最大上升速率升高 ;促进血浆AM、CNP升高和CGRP下降 ,AM与CNP呈正相关 ;与CGRP呈负相关。结论 缺氧导致肺动脉高压形成 ;右心功能随肺动脉高压的变化出现代偿反应 ;AM、CGRP和CNP参与缺氧性肺动脉高压的病理生理过程 ;AM、CGRP和CNP的动态变化可作为判断病情的指标。

Objective To explore the effects of hypoxia on the syntheses and secretion of adrenomedullin (AM), calcitonin gene related peptide (CGRP) and c type natriuretic peptide (CNP) and the relationship between these peptides. Methods Rat models were established with hypoxia for 10, 20 and 30 d respectively and rats under normal altitude were served as control. Pulmonary artery pressure and the maximum increasing speed of right ventricle (RVdp/dt max ) were measured in every group. The dynamic changes of AM, CGRP and CNP concentrations in plasma were studied with radioimmunoassay. Results During hypoxia, pulmonary artery pressure and RVdp/dt max were enhanced. Plasma AM and CNP concentrations were increased while CGRP was decreased significantly. The plasma level of AM had positive correlation with that of CNP, but negatively correlated with that of CGRP. Conclusion Results indicate that hypoxia may cause pulmonary artery pressure change and right ventricle has compensatory reaction to hypoxic pulmonary hypertension. Dynamic changes of plasma AM, CGRP and CNP concentrations can be regarded as indexes for condition of illness.