Lecithin depletion in liver mitochondria of rats fed a choline-deficient diet. Effect on beta-hydroxybutyrate dehydrogenase.
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Abnormalties in renal concentrating ability and free water reabsorption, and a diminished sodium excretion, glomerular filtration rate, and effective renal plasma flow were observed in adolescent rats which ingested a lipotrope deficient diet for 10 months.
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Salmonella mutagenesis assays were used to evaluate the mutagenicity of several chemical carcinogens as mediated by liver S-9 fractions from rats fed a choline-supplemented (CS) or choline-devoid (CD) diet. The liver S-9 fraction from CD diet-fed rats was found to have a significantly decreased ability to activate 2-acetylaminofluorene (2-AAF), 2-aminoanthracene (2-AA) and 6-aminochrysene (6-AC), but not N-hydroxy-2-acetylaminofluorene (HO-N-2-AAF) and dimethylnitrosamine (DMN). The same liver S-9 fraction was also less effective in deactivating N-methyl-N1-nitro-N-nitrosoguanidine (MNNG) but not methylnitrosourea (MNU). A decrease (20%) in the cytochrome P-450 content was found in liver microsomes of CD diet-fed rats. Although it has been shown that feeding a CD diet to rats enhances chemical hepatocarcinogenesis, the data presented here suggest that CD diet does not increase the activation of the chemical procarcinogens tested.