PULMONARY ARTERIAL SMOOTH-MUSCLE CONTRACTILITY IN HYPOXIA-INDUCED PULMONARY-HYPERTENSION

被引:19
作者
GRIFFITH, SL [1 ]
RHOADES, RA [1 ]
PACKER, CS [1 ]
机构
[1] INDIANA UNIV,SCH MED,DEPT PHYSIOL & BIOPHYS,INDIANAPOLIS,IN 46202
关键词
FORCE-VELOCITY RELATIONSHIP; VASCULAR MUSCLE; LENGTH-TENSION CURVES; SMOOTH MUSCLE MECHANICS; PULMONARY CIRCULATION;
D O I
10.1152/jappl.1994.77.1.406
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The highly compliant low-resistance pulmonary vasculature is markedly altered with chronic hypoxia. Remodeling in response to hypoxia and/or hypertension involves hypertrophy and hyperplasia of smooth muscle and excessive deposition of connective tissue that likely contributes to the maintenance or exasperates the already elevated pulmonary arterial (PA) pressure. The purpose of this study was to investigate the effect of chronic hypoxia on the contractile properties of PA smooth muscle. Isometric and isotonic experiments were performed on excised PA rings from pulmonary hypertensive (induced by 14 days of hypoxia) Sprague-Dawley rats. A doubling of the vessel wall thickness occurred during the development of hypoxia-induced pulmonary hypertension. Functionally, there was a decrease in isometric stress (force to cross-sectional area ratio). No difference was detected in the velocity of shortening or in total shortening ability. This study provides evidence that, in addition to the morphological changes, changes in PA smooth muscle contractility also appear to play a role in the development and/or maintenance of hypoxia-induced pulmonary hypertension.
引用
收藏
页码:406 / 414
页数:9
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