© 2000 American Heart Association, Inc.
Integrative Physiology |
Prevention of Hypoxia-Induced Pulmonary Hypertension by Enhancement of Endogenous Heme Oxygenase-1 in the Rat
From the Division of Newborn Medicine, Department of Pediatrics (H.C., T.M., H.K., S.K.), Children’s Hospital, Harvard Medical School, and Cardiovascular Biology Laboratory, Pulmonary and Critical Care Division (C.-M.H., B.A., M.A.P.), Brigham and Women’s Hospital, Harvard School of Public Health, Boston, Mass.
Correspondence to Stella Kourembanas, MD, Children’s Hospital, 300 Longwood Ave, Enders 9, Boston, MA 02115. E-mail kourembanas{at}hub.tch.harvard.edu
Abstract—We investigated the role of heme oxygenase (HO)–1 in the development of hypoxia-induced pulmonary hypertension. HO catalyzes the breakdown of heme to the antioxidant bilirubin and the vasodilator carbon monoxide. Hypoxia is a potent but transient inducer of HO-1 in vascular smooth muscle cells in vitro and in the lung in vivo. By using agonists of HO-1, we sustained a high expression of HO-1 in the lungs of rats for 1 week. We report that this in vivo enhancement of HO-1 in the lung prevented the development of hypoxic pulmonary hypertension and inhibited the structural remodeling of the pulmonary vessels. The mechanism(s) underlying this effect may involve a direct vasodilating and antiproliferative action of endogenous carbon monoxide, as well as an indirect effect of carbon monoxide on the production of vasoconstrictors. These results provide evidence that enhancement of endogenous adaptive responses may be used to prevent hypoxia-induced pulmonary hypertension.
Key Words: vascular remodeling • gene expression • hypoxia
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