Wiegand, H., Boesch-Saadatmandi, C., Regos, I., Treutter, D., Wolffram, S. and Rimbach, Gerald (2009) Effects of Quercetin and Catechin on Hepatic Glutathione-S Transferase (GST), NAD(P)H Quinone Oxidoreductase 1 (NQO1), and Antioxidant Enzyme Activity Levels in Rats. Nutrition and Cancer, 61 (5). pp. 717-722. DOI 10.1080/01635580902825621.

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Abstract

Cell culture data indicate that quercetin and catechin may affect the activity of phase II and antioxidant enzymes. However, little is known about the impact of dietary flavonoids in vivo. Therefore, the present study aimed to investigate the in vivo effects of the flavonoids quercetin and catechin on mRNA and activity levels of phase II enzymes glutathione-S transferase (GST) and NAD(P)H quinone oxidoreductase-1 (NQO1) in rat liver. Furthermore, the activity of the hepatic antioxidant enzymes catalase (CAT), glutathione peroxidase (GPx), and superoxide dismutase (SOD) was determined. Feeding male Wistar rats (3 x 6 animals) over 3 wk with semisynthetic diets enriched with quercetin and catechin (2 g/kg diet) did not affect liver enzyme activity of CAT, GPx, and SOD as well lipid peroxidation and glutathione levels. Dietary quercetin significantly decreased activity of hepatic GST (24%), whereas dietary catechin significantly decreased NQO1 activity (26%) compared to controls. Changes in GST and NQO1 activity were partly reflected on mRNA levels. Current data indicate that dietary flavonoids have little effects on liver oxidant/antioxidant status but do significantly affect the phase II enzymes GST and NQO1 in rat liver. This in turn may affect the ability of the organism to detoxify endogenous and exogenous xenobiotics.

Document Type:	Article
Keywords:	dt-diaphoraseflavonol quercetin pancreatic-cancer human plasma cell-lines red wine liver inhibition expression induction
Research affiliation:	Kiel University Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence
Refereed:	Yes
Open Access Journal?:	No
Publisher:	Institute of Physics
Projects:	Future Ocean
Date Deposited:	26 Jan 2011 14:30
Last Modified:	23 Sep 2019 20:53
URI:	https://oceanrep.geomar.de/id/eprint/9835

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