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The effects of dietary pantethine levels on the drug-metabolizing system were investigated under administration of varying amounts of autoxidized linoleate (AL) with rat liver microsomes and S-9 fractions. AL having 800 meq/kg of peroxide value and 1,700 meq/kg of carbonyl value was dosed to the rats of each group given drinking water containing 0 mg% (deficient), 6.25 mg% (normal), and 125 mg% pantethine (sufficient). The contents and activities of the enzymes in the drug-metabolizing system in the rat liver of each pantethine-level group changed essentially in a similar manner, that is, they were induced at an AL daily dose of 0.2 ml/100 g body weight (i.e., small dose) for 5 successive days and lowered at a daily dose of 0.4 ml/100 g body weight (i.e., large dose) by the same administration period, compared with respective non-AL groups in each of the three pantethine levels. In both non-AL and the small-dose AL, enzyme activities of the electron transfer system in rat liver microsomes, aminopyrine-N-demethylase activity, and metabolic activation of 2-acetylaminofluorene in S-9 fractions were significantly higher in the pantethine-deficient group than in the pantethine-normal and -sufficient groups. In the large-dose AL, the enzyme activities in the drug-metabolizing system decreased significantly in any pantethine levels, though the survival rate of the rats was higher in the pantethine-sufficient group than in the pantethine-normal groups. The results suggest that the pantethine relieves the effect of dosed AL on the drug-metabolizing system in rat liver.

Effects of dietary pantethine levels on drug-metabolizing system in the liver of rats orally administered varying amounts of autoxidized linoleate.