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AJP - Lung Cellular and Molecular Physiology, Vol 270, Issue 1 164-L170, Copyright © 1996 by American Physiological Society
ARTICLES |
T. D. Le Cras, C. Xue, A. Rengasamy and R. A. Johns
Department of Anesthesiology, University of Virginia, Charlottesville 22908, USA.
The effect of chronic hypoxia-induced pulmonary hypertension on nitric oxide synthase (NOS) in the lung is controversial. To clarify the regulation of endothelial and inducible NOS (eNOS and iNOS) expression in the chronically hypoxic lung, Northern and Western blot analyses were performed on mRNA and total protein from lungs of rats exposed to 3 wk of hypoxia (10% O2, normobaric) or normoxia. Expression of the mRNA and protein for eNOS was significantly increased (1.6-fold and 2.1-fold, respectively) by hypoxia. Immunohistochemistry with an isoform-specific antibody demonstrated de novo expression of eNOS in the endothelium of resistance vessels in the pulmonary vasculature of the hypoxic rats. eNOS was detected in the endothelium of large vessels in both normoxic and hypoxic rat lungs. The level of mRNA and protein for iNOS was also found to be significantly increased (1.9-fold and 1.4-fold, respectively). In addition to the 4.4-kilobase (kb) iNOS mRNA species, a novel 4.0-kb species was also induced by hypoxia. We conclude that expression of eNOS and iNOS was increased in the lungs of rats subjected to chronic hypoxia, and that there was de novo expression of eNOS protein in the microvascular endothelium.
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