Abstract
The effects of 1-O-hexyl-2,3,5-trimethylhydroquinone (HTHQ), green tea catechins (GTC), alpha-tocopherol, beta-carotene, chlorophyllin, phenylethylisothiocyanate (PEITC), 3-O-ethylascorbic acid (EAsA), 3-O-dodecylcarbomethyl ascorbic acid (DAsA), n-tritriacontane-16,18-dione (TTAD) and d-limonene on 2-amino-6-methyldipyrido[1,2-a:3',2'-d]imidazole (Glu-P-1)- or dimethylnitrosamine (DMN)-induced hepatocarcinogenesis, and the dose dependence of HTHQ inhibition of Glu-P-1- or 2-amino-3,8-dimethylimidazo [4,5-f]quinoxaline (MeIQx)-influence on lesion development were examined in a rat medium-term liver bioassay system featuring diethylnitrosamine initiation and partial hepatectomy. At the end of week 8, the number and total area of glutathione S-transferase placental form (GST-P) positive liver foci in rats treated with 0.03% Glu-P-1 alone were increased significantly (46.8 +/- 11.0 and 12.0 +/- 5.6 respectively) as compared to the control values (3.8 +/- 1.6 and 0.4 +/- 0.2). Combined treatment with 1% HTHQ remarkably reduced both of these parameters (8.1 +/- 2.1 and 0.6 +/- 0.2). GTC (1%), PEITC (0.1%), beta-carotene (0.1%) and DAsA (1%) also demonstrated inhibition but less than HTHQ. On the other hand, these antioxidants did no...Continue Reading
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