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. 1987 Dec;56(6):774–778. doi: 10.1038/bjc.1987.286

Choline deficient diet enhances the initiating and promoting effects of methapyrilene hydrochloride in rat liver as assayed by the induction of gamma-glutamyltranspeptidase-positive hepatocyte foci.

M I Perera 1, S L Katyal 1, H Shinozuka 1
PMCID: PMC2002423  PMID: 2893639

Abstract

Earlier we demonstrated that short-term feeding of methapyrilene hydrochloride (MPH) and of a choline deficient (CD) diet to rats induced peroxidative damage of microsomal membrane lipids of liver cells. In the present study, we investigated whether a CD diet modifies the extent of MPH-induced lipid peroxidation and whether the modifications lead to changes in the initiating and promoting action of these agents using assays of the induction of gamma-glutamyltranspeptidase (GGT)-positive hepatocyte foci. Addition of 0.1% MPH to a CD diet enhanced the extent of microsomal lipid peroxidation induced by a CD diet alone. Feeding a choline supplemented (CS) or a CD diet containing 0.1% MPH for 2 weeks followed by 7 weeks promotion by a CD diet plus phenobarbital was ineffective in inducing GGT-positive foci. Feeding MPH in a CS or a CD diet for 4 weeks, however, resulted in the development of substantial numbers of GGT-positive foci. There was a 3 fold increase in the number of foci in rats initiated with a CD + MPH diet over that in rats initiated with a CS + MPH diet. 0.1% MPH in a CS diet or a CD diet exerted significant promotional effects on the induction of GGT-positive foci in rats initiated with a single injection of diethylnitrosamine. Addition of MPH to a CD diet was additive in inducing GGT-positive foci. The results suggest that lipid peroxidation of the liver may be involved in the carcinogenic and/or promoting effects of MPH and a CD diet.

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Selected References

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