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Inhibition potential of concomitant butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), catechol or sodium ascorbate (Na-AsA) administration on development of diethylnitrosamine (DEN) initiated glutathione S-transferase placental form (GST-P) positive foci in rat liver under the influence of 2-acetylaminofluorene (2-AAF) or 3'-methyl-4-dimethylaminoazobenzene (3'-Me-DAB) plus partial hepatectomy (PH) was investigated. Whereas BHA, BHT and catechol exerted marked inhibitory effects, Na-AsA lacked any modifying potential. The compounds that demonstrated inhibition also induced GST-P in the hepatic periportal areas, suggesting that development of GST-P positive foci is negatively influenced by extra-focal increase in this enzyme form observed with BHA, BHT or catechol.
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