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AJP - Lung Cellular and Molecular Physiology, Vol 263, Issue 2 194-L200, Copyright © 1992 by American Physiological Society
ARTICLES |
S. Eddahibi, S. Adnot, C. Carville, Y. Blouquit and B. Raffestin
Departement de Physiologie, Institut National de la Sante et de la Recherche Medicale, U 296, Hopital Henri Mondor, Creteil, France.
We investigated whether loss of endothelial-derived relaxing factor (EDRF) activity in the pulmonary vessels of chronically hypoxic rats could be restored by pretreatment with L-arginine. We measured vasodilation to acetylcholine (ACh), calcium ionophore A23187, or linsidomine (Sin-1) under conditions of increased vascular tone induced by U-46619 (50 pmol/min), as well as vasoconstriction to endothelin-1 (ET) in isolated lungs pretreated with meclofenamate (3 microM). In lungs from normoxic (N) rats, in vitro L- or D-arginine (10(-3) M) did not alter vasodilation to the endothelium-dependent agents ACh (10(-9)-10(-6) M) and A23187 (10(-9)-10(-7) M), but NG-monomethyl-L-arginine (10(-3) M) completely abolished it. In lungs from rats exposed to 3 wk of hypoxia (H), vasodilation to ACh or A23187 was fully restored after in vitro L-arginine (10(-3) M) or N alpha-benzoyl-L-arginine (5 x 10(-5) M) but remained abolished after D-arginine, L-citrulline, L-ornithine, or L-argininosuccinic acid. In vivo pretreatment of H rats with L-arginine (300 mg/kg iv) 30 min before isolating the lung also restored vasodilation to A23187. Vasodilation to the endothelium-independent agent Sin-1 was similar in both groups of lungs and was not altered by in vitro L-arginine. L-arginine attenuated the increased pressor response to ET (300 pmol) of H rat lungs but had no effect in N rats. Our results demonstrate that loss of EDRF activity associated with hypoxic pulmonary hypertension may be reversed by supplying L-arginine.
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