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Inhibition of NADPH-cytochrome P450 reductase and glyceryl trinitrate biotransformation by diphenyleneiodonium sulfate.

Abstract：

:We reported previously that the flavoprotein inhibitor diphenyleneiodonium sulfate (DPI) irreversibly inhibited the metabolic activation of glyceryl trinitrate (GTN) in isolated aorta, possibly through inhibition of vascular NADPH-cytochrome P450 reductase (CPR). We report that the content of CPR represents 0.03 to 0.1% of aortic microsomal protein and that DPI caused a concentration- and time-dependent inhibition of purified cDNA-expressed rat liver CPR and of aortic and hepatic microsomal NADPH-cytochrome c reductase activity. Purified CPR incubated with NADPH and GTN under anaerobic, but not aerobic conditions formed the GTN metabolites glyceryl-1,3-dinitrate (1,3-GDN) and glyceryl-1,2-dinitrate (1,2-GDN). GTN biotransformation by purified CPR and by aortic and hepatic microsomes was inhibited > 90% after treatment with DPI and NADPH. DPI treatment also inhibited the production of activators of guanylyl cyclase formed by hepatic microsomes. We also tested the effect of DPI on the hemodynamic-pharmacokinetic properties of GTN in conscious rats. Pretreatment with DPI (2 mg/kg) significantly inhibited the blood pressure lowering effect of GTN and inhibited the initial appearance of 1,2-GDN (1-5 min) and the clearance of 1,3-GDN. These data suggest that the rapid initial formation of 1,2-GDN is related to mechanism-based GTN biotransformation and to enzyme systems sensitive to DPI inhibition. We conclude that vascular CPR is a site of action for the inhibition by DPI of the metabolic activation of GTN, and that vascular CPR is a novel site of GTN biotransformation that should be considered when investigating the mechanism of GTN action in vascular tissue.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

McGuire JJ,Anderson DJ,McDonald BJ,Narayanasami R,Bennett BM

doi

10.1016/s0006-2952(98)00216-0

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

881-93

issue

7

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(98)00216-0

journal_volume

56

pub_type

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