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. 1992 Dec;107(4):1001–1007. doi: 10.1111/j.1476-5381.1992.tb13398.x

Potentiation of the vasorelaxant activity of nitric oxide by hydroxyguanidine: implications for the nature of endothelium-derived relaxing factor.

A Zembowicz 1, T A Swierkosz 1, G J Southan 1, M Hecker 1, J R Vane 1
PMCID: PMC1907957  PMID: 1281716

Abstract

1. We recently demonstrated that NG-hydroxy-L-arginine (L-HOArg) is a substrate for the constitutive nitric oxide (NO) synthase present in bovine aortic endothelial cells cultured on microcarrier beads (EC). Furthermore, L-HOArg reacts chemically with NO released from these cells to form a potent and more stable vasodilator. This is most likely through a reaction with the hydroxyguanidino group. 2. Here, we studied the interaction of a simpler molecule, hydroxyguanidine (HOG) with NO. 3. HOG (10 microM), like L-HOArg (10 microM) or NG-hydroxy-D-arginine (D-HOArg, 10 microM), potentiated and stabilized the relaxant activity of authentic NO. 4. When NO was bubbled through the solution of HOG, a new compound was formed. It had similar physicochemical properties to those of the previously described L-HOArg/NO adduct. It was also a potent vasodilator and its action was inhibited by oxyhaemoglobin (10 microM), indicating formation of a NO-containing substance. 5. Moreover, HOG (10 microM) was not a substrate for the constitutive NO synthase present in the microsomal fraction of EC and did not affect the flow-induced or bradykinin-stimulated generation of prostacyclin, as measured by 6-keto-PGF1 alpha. 6. We also studied the effect of HOG on the endothelium-derived relaxing factor (EDRF) released from the column of EC. HOG (10 microM) potentiated and stabilized the relaxations of rabbit aortic strips induced by EDRF released by bradykinin (5-20 pmol) or ADP (5-10 nmol). These relaxations were inhibited by NG-nitro-L-arginine methyl ester (L-NAME, 10 microM) and L-arginine (L-Arg, 1 mM) reversed the inhibitory effects of L-NAME.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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