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Am J Physiol Lung Cell Mol Physiol 288: L213-L226, 2005; doi:10.1152/ajplung.00103.2004
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INVITED REVIEW

Role of veins in regulation of pulmonary circulation

Yuansheng Gao and J. Usha Raj

Division of Neonatology, Department of Pediatrics, Harbor-UCLA Research and Education Institute, Geffen School of Medicine at University of California, Los Angeles, California

Pulmonary veins have been seen primarily as conduit vessels; however, over the past two decades, a large amount of evidence has accumulated to indicate that pulmonary veins can exhibit substantial vasoactivity. In this review, the role of veins in regulation of the pulmonary circulation, particularly during the perinatal period and under certain pathophysiological conditions, is discussed. In the fetus, pulmonary veins contribute a significant fraction to total pulmonary vascular resistance. At birth, the veins as well as the arteries relax in response to endothelium-derived nitric oxide and dilator prostaglandins, thereby assisting in the fall in pulmonary vascular resistance. These effects are oxygen dependent and modulated by cGMP-dependent protein kinase. Under chronic hypoxic conditions, pulmonary veins undergo remodeling and demonstrate substantial constriction and hypertrophy. In a number of species, including the human, pulmonary veins are also the primary sites of action of certain vasoconstrictors such as endothelin and thromboxane. In various pathological conditions, there is an increased synthesis of these vasoactive agents that may lead to pulmonary venous constriction, increased microvascular pressures for fluid filtration, and formation of pulmonary edema. In conclusion, the significant role of veins in regulation of the pulmonary circulation needs to be appreciated to better prevent, diagnose, and treat lung disease.

pulmonary vasoactivity; hypoxia; pulmonary hypertension; edema


Address for reprint requests and other correspondence: J. Usha Raj, Harbor-UCLA Research and Education Institute, 1124 W. Carson St., RB-1, Torrance, CA 90502 (E-mail: raj{at}labiomed.org)




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