Evidence for a cyclic GMP-independent mechanism in the anti-platelet action of S-nitrosoglutathione

British Journal of Pharmacology
M P GordgeA A Noronha-Dutra

Abstract

1. We have measured the ability of a range of NO donor compounds to stimulate cyclic GMP accumulation and inhibit collagen-induced aggregation of human washed platelets. In addition, the rate of spontaneous release of NO from each donor has been measured spectrophotometrically by the oxidation of oxyhaemoglobin to methaemoglobin. The NO donors used were five s-nitrosothiol compounds: S-nitrosoglutathione (GSNO), S-nitrosocysteine (cysNO), S-nitroso-N-acetyl-DL-penicillamine (SNAP), S-nitroso-N-acetyl-cysteine (SNAC), S-nitrosohomocysteine (homocysNO), and two non-nitrosothiol compounds: diethylamine NONOate (DEANO) and sodium nitroprusside (SNP). 2. Using 10 microM of each donor compound, mean+/-s.e.mean rate of NO release ranged from 0.04+/-0.001 nmol min(-1) (for SNP) to 3.15+/-0.29 nmol min(-1) (for cysNO); cyclic GMP accumulation ranged from 0.43+/-0.05 pmol per 10(8) platelets (for SNP) to 2.67+/-0.31 pmol per 10(8) platelets (for cysNO), and inhibition of platelet aggregation ranged from 40+/-6.4% (for SNP) to 90+/-3.8% (for SNAC). 3. There was a significant positive correlation between the rate of NO release and the ability of the different NO donors to stimulate intra-platelet cyclic GMP accumulation (r = 0.83; P = 0.02...Continue Reading

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