Inhibitory effects of quercetin on aflatoxin B1-induced hepatic damage in mice

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
K-C ChoiJ-C Lee

Abstract

Aflatoxin B(1) (AFB(1))-mediated hepatic damage is involved in production of AFB(1)-8,9-epoxide-bound DNA adducts and this is also affected by a pro-oxidant potential of the toxin. In this study we investigated the effects of quercetin on AFB(1)-treated HepG2 cells. We also examined the biochemical mechanisms associated with the effects of quercetin on AFB(1)-mediated liver damage in mice. Our results revealed that quercetin and isorhamnetin inhibit production of reactive oxygen species and cytotoxicity, and block the decrease of reduced glutathione (GSH) levels in AFB(1)-treated HepG2 cells. Isorhamnetin have inhibitory ability on lipid peroxidation stronger than quercetin in the cells. Oral supplementation with quercetin decreased serum lactate dehydrogenase levels, increased hepatic GSH levels and superoxide dismutase activity, and reduced lipid peroxidation in both the liver and kidney in AFB(1)-treated mice. However, quercetin did not show a significant reduction on serum levels of alkaline phosphate, alanine aminotransferase and aspartate aminotransferase that were increased in AFB(1)-treated mice. HPLC analysis revealed that quercetin in plasma is mainly present as glucoronides and/or sulfates of quercetin. Collectively,...Continue Reading

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