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Journal of Applied Physiology, Vol 76, Issue 2 933-940, Copyright © 1994 by American Physiological Society
ARTICLES |
T. C. Isaacson, V. Hampl, E. K. Weir, D. P. Nelson and S. L. Archer
Department of Medicine, Veterans Affairs Medical Center, Minneapolis, Minnesota 55417.
The hypothesis that the endothelium-derived relaxing factor/nitric oxide (EDNO) activity is elevated in chronic hypoxic pulmonary hypertension (CH-PHT) was tested using isolated Krebs-albumin-perfused rat lungs. Concentration of the EDNO decomposition products (NOx) in the lungs' effluent was measured by a modified chemiluminescence assay. The functional significance of basal EDNO production was studied by measuring the vasoconstrictor response to an EDNO synthesis inhibitor, N omega-nitro-L-arginine methyl ester (L-NAME). Reactivity to the endothelium-dependent vasodilator substance P and to exogenous NO was also studied. More NOx was found in effluent from CH-PHT (22.3 +/- 9.8 nM) than control (0.4 +/- 3.9 nM) lungs. The L-NAME-induced vasoconstriction was greater in CH-PHT than in control rats. The sensitivity, but not the maximal vasodilation, to exogenous NO was elevated in CH-PHT. The substance P-induced vasodilation was potentiated in CH-PHT compared with control rats and blocked by L-NAME in both groups. We conclude that basal and agonist-stimulated pulmonary EDNO activity is enhanced in this model of CH-PHT. The EDNO synthesis may play a counterregulatory role in CH-PHT.
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