PMID: 8968380Dec 1, 1996Paper

Inhibition of the pharmacological actions of glyceryl trinitrate after the electroporetic delivery of a glutathione S-transferase inhibitor

The Journal of Pharmacology and Experimental Therapeutics
W C SimonBrian M Bennett

Abstract

It is generally accepted that the biotransformation of organic nitrates to an activator of soluble guanylyl cyclase (presumably NO) is a prerequisite for their vasodilator actions. The glutathione S-transferases (GSTs) mediate glyceryl trinitrate (GTN) biotransformation, but whether this results in guanylyl cyclase activation and relaxation of vascular smooth muscle is equivocal. We used electroporation of adherent cultured cells to deliver the membrane-impermeable GST inhibitor basilen blue (BB) into porcine kidney epithelial cells. This resulted in significant inhibition of GTN biotransformation because of a reduction in the formation of glyceryl-1,2-dinitrate, but not glyceryl-1, 3-dinitrate. In the 105,000 x g supernatant fraction of porcine kidney epithelial cells, BB significantly inhibited the formation of both GTN metabolites. Electroporation of porcine kidney epithelial cells with BB also inhibited GTN-induced cyclic GMP accumulation. This was caused in part by inhibition of soluble guanylyl cyclase by BB. To differentiate BB-mediated inhibition of the bioactivation of GTN from its inhibitory effect on guanylyl cyclase, inhibition of cyclic GMP accumulation induced by GTN and that induced by the spontaneous NO-releasin...Continue Reading

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