Inhibition of microsomal lipid peroxidation and Cytochrome P-450 catalyzed reactions by nitrofurane compounds

Dublin Core

Title

Inhibition of microsomal lipid peroxidation and Cytochrome P-450 catalyzed reactions by nitrofurane compounds

Subject

NITROFURANO
CITOCROMO
PEROXIDACION
BIBLIOGRAFIA NACIONAL QUIMICA
1991
CATALISIS
URUGUAY

Abstract

(5-Nitro-2-furfurylidene)amino compounds bearing triazol-4-yl, benzimidazol-1-yl, pyrazol-1-yl, triazin-4-yl or related groups (a) stimulated superoxide anion radical generated by rat liver microsomes in the presence of NADPH and oxygen; (b) inhibited the NADPH-dependent, iron-catalyzed microsomal lipid peroxidation; (c) prevented the NADPH-dependent destruction of cytochrome P-450; (d) inhibited the NADPH-dependent microsomal aniline 4-hydroxylase activity; (e) failed to inhibit either the cumenyl hydroperoxide-dependent lipid peroxidation or the aniline-4-hydroxylase activity, except for the benzimidazol-1-yl and the substituted triazol-4-yl derivatives, which produced minor inhibitions. Reducing equivalents enhanced the benzimidazol-1-yl derivative inhibition of the cumenyl hydroperoxide-induced lipid peroxidation. The ESR spectrum of the benzimidazol-1-yl derivative, reduced anaerobically by NADPH-supplemented microsomes, showed characteristic spin couplings. Compounds bearing unsaturated nitrogen heterocycles were always more active than those bearing other groups, such as nifurtimox or nitrofurazone. The energy level of the lowest unoccupied molecular orbital was in fair agreement with the capability of nitrofurans for redox-cycling and related actions. It is concluded that nitrofuran inhibition of microsomal lipid peroxidation and cytochrome P-450-catalyzed reactions was mostly due to diversion of reducing equivalents from NADPH to dioxygen. Trapping of free radicals involved in propagating lipid peroxidation might contribute to the overall effect of the benzimidazol-1-yl and substituted triazol-4-yl derivatives.

Creator

Dubin, Marta
Fernández, S.
Stoppani, A.

Source

Free Radical Research Communications v. 14, , 1991. -- p. 419

Publisher

Taylor & Francis Group

Date

1991

Rights

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Format

PDF

Language

Inglés

Type

Artículo

Identifier

DOI:10.3109/10715769109093430

Document Item Type Metadata

Original Format

PDF
Date Added
May 9, 2016
Collection
Bibliografía Nacional Química
Item Type
Document
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Citation
Dubin, Marta et al., “Inhibition of microsomal lipid peroxidation and Cytochrome P-450 catalyzed reactions by nitrofurane compounds,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed December 14, 2025, https://riquim.fq.edu.uy/items/show/3962.