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Am J Physiol Regul Integr Comp Physiol 263: R1260-R1264, 1992;
0363-6119/92 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 263, Issue 6 1260-R1264, Copyright © 1992 by American Physiological Society

ARTICLES

Normobaric hypoxia stimulates endothelin-1 gene expression in the rat

T. S. Elton, S. Oparil, G. R. Taylor, P. H. Hicks, R. H. Yang, H. Jin and Y. F. Chen
Department of Medicine, University of Alabama, Birmingham 35294.

The current study tested the hypothesis that exposure to hypoxia enhances endothelin-1 (ET-1) gene expression and elevates circulating ET-1 levels in the rat. Rats were exposed to normobaric hypoxia (10% O2) or room air for 24 or 48 h. ET-1 in arterial blood was measured by radioimmunoassay. ET-1 gene transcript levels were measured by the slot blot technique on total RNA isolated from lung, right and left atria, right and left ventricles, kidney, spleen, liver, brain, main trunk of pulmonary artery, and thoracic aorta. Blots were probed with a 0.5 kb rat prepro ET-1 cDNA that does not cross-hybridize with mRNA for ET-2 or ET-3. Plasma ET-1 levels were increased significantly at 24 (10.03 +/- 2.33 pg/ml) and 48 h (14.02 +/- 3.44 pg/ml) of hypoxia compared with air controls (4.14 +/- 0.66 pg/ml). ET-1 mRNA levels were increased significantly (2-fold) in lung and right atrium after 48 h of hypoxia; no change was seen in organs perfused by the systemic vascular bed. These findings suggest that the hypoxia-induced increase in circulating ET-1 levels is mainly of pulmonary origin. A paracrine effect of ET-1 produced by lung endothelial cells could account for hypoxic pulmonary hypertension.


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