Inhibitory effect of nicotinamide to paraquat toxicity and the reaction site on complex I.

Abstract:

:The inhibitory effect and mechanism of action of nicotinamide to paraquat toxicity were studied in male Sprague-Dawley rats. Proteins of submitochondrial particles (SMP), especially of mol. wt. 25-30 kDa, in rat lungs were destroyed by paraquat radicals, and aggregated protein bands approximately 100 kDa were observed by polyacrylamide electrophoresis. The competitive inhibition effects were observed of nicotinamide on NADH oxidation by paraquat via SMP in rat lungs and the Ki was 9.3 mM. The inhibitory effects of nicotinamide on lipid peroxidation by paraquat with rat lung and liver SMP were verified. The times of occurrence of dyspnea and death in rats after paraquat exposure were delayed by nicotinamide administration. The activity of NADH: ubiquinone reaction of NADH:ubiquinone oxidoreductase (complex I) in rat lung was reduced 24 h after paraquat exposure, and was protected by nicotinamide. The activity of NADH:ferricyanide reaction of complex I was, however, reduced by administration not only of paraquat but also nicotinamide. These results imply that nicotinamide is inhibitory to paraquat toxicity. Nicotinamide, paraquat, and ferricyanide may react at overlapping sites on complex I.

journal_name

Arch Toxicol

journal_title

Archives of toxicology

authors

Fukushima T,Gao T,Tawara T,Hojo N,Isobe A,Yamane Y

doi

10.1007/s002040050437

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

633-7

issue

10

eissn

0340-5761

issn

1432-0738

journal_volume

71

pub_type

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