Abstract
The short-term effects of citral on the liver have been studied in two strains of rat. Hepatomegaly was accompanied in citral-treated rats by an altered distribution of lipid and glycogen in the liver and peroxisome proliferation occurred in a manner reminiscent of that associated with some hypolipidaemic compounds. Specific biochemical markers supported the morphological changes in the peroxisomes. Cyanide-insensitive palmitoyl CoA oxidation showed, at the maximum, fourfold and threefold inductions in Wistar albino and Long Evans hooded rats, respectively. In addition, induction of cytochrome P-450 levels was greater in the Long Evans than in the Wistar rats, the maximal increases recorded being 81 and 27% respectively. A peroxisome-associated polypeptide of molecular weight 80,000 daltons (PPA-80) was induced, especially in Long Evans rats. No alterations in plasma triglycerides or total cholesterol were detected. The differential induction of the mixed-function oxidase system and the differential proliferation of peroxisomes in these two strains of rat suggest that citral may be metabolized differently in the two strains. The study indicates that peroxisomal and possibly also mitochondrial changes are involved in the action of citral on lipid metabolism.
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