Inhibition of the synthesis of endothelium derived relaxing factor by NG-monomethyl-L-arginine, a competitive inhibitor of the synthesis of nitric oxide from L-arginine, enhances hypoxic pulmonary vasoconstriction in pulmonary artery rings and isolated, Krebs albumin perfused rat lungs. L-arginine rapidly reduces hypoxic vasoconstriction, particularly in lungs treated with NG-monomethyl-L-arginine. Following administration of NG-monomethyl-L-arginine, bradykinin-induced vasodilation is inhibited (p<0.01) and a bradykinin-induced vasoconstriction develops (p<0.001). NG-monomethyl-L-arginine does not significantly diminish acetylcholine-induced vasodilatation in the isolated lung. NG-monomethyl-L-arginine causes an endothelium-dependent vasoconstriction in pulmonary artery rings.
|Original language||English (US)|
|Number of pages||8|
|Journal||Biochemical and Biophysical Research Communications|
|State||Published - Nov 15 1989|
Bibliographical noteFunding Information:
This work was supported by the Veterans Administration.