慢性缺氧性肺动脉高压大鼠内皮素与心房钠尿肽的变化

内皮素（ET）是迄今发现最强的内源性缩血管物质，并能使血管平滑肌细胞分裂增殖。心房钠尿肽（ANP）具有利钠、利尿、扩张血管等作用。这两种血管活性多肽对心血管系统的作用相互抬抗。本实验采用放射免疫测定法测定慢性缺氧性肺动脉高压大鼠的血浆、心肌组织ET及ANP水平，并观察两者之间变化关系，为研究肺动脉高压提供依据。1材料和方法1．1大鼠肺动脉高压模型制备健康雄性SD大鼠24只，体重150～300g，由第二军医大学实验动物中心提供。随机分成两组：实验组12只，置于低压舱中，舱内预先给予碱石灰（60g／d），抽真空，海拔上升速…

Changes of endothelin and atrial natriuretic peptide in rats of chronic hypoxic pulmonary hypertension

To observe the changes of endothelin(ET) and atrial natriuretic peptide(ANP) lev-els in chronic hypoxic pulmonary hypertensive rats and discuss their mechanism. Methods: We duplicatedthe models of chronic hyp0xic pulmonary hypertensive rats and tested the concentrations of ET and ANP ofplasma and cardiac tissue by radioimmunoassey. Results: In pulmonary hypertension group, plasma ET,plasma ANP and myocardial ET levels increased more significantly than those of controls,except that my-ocardial ANP concentration decreased. There were positive c0rrelati0ns between plasma ET level and plas-ma ANP level and between plasma ET level and myocardial ET level, but a negative correlation betweenplasma ANP level and myocardial ANP level. C0nclusion: It is suggested that the synthesis and secretionof ET and ANP increase in pulmonary hypertension,and therefore provides reference to clinical diagnosisand therapy.