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Effects of dietary glutathione on plasma and liver lipid levels in rats fed on a high cholesterol diet


Effects of dietary glutathione on plasma and liver lipid levels in rats fed on a high cholesterol diet



Agricultural and Biological Chemistry 51(6): 1601-1606



ISSN/ISBN: 0002-1369

DOI: 10.1271/bbb1961.51.1601

The effects of dietary glutathione (GSH) on plasma and liver lipid concentrations were investigated with rats fed on a high cholesterol diet. When graded levels of GSH. 0.75 to 5.0%, were added to the 25% casein basal diet, the plasma total cholesterol level was significantly decreased and the HDL-cholesterol level was inversely increased in all addition levels without influence on the growth of animals except for the 5% addition level: the dietary addition of 5% GSH markedly depressed the growth and food consumption of rats and caused a slight diarrhea. Plasma triglyceride and phospholipid levels were decreased by the dietary addition of GSH. The contents of cholesterol and triglyceride in the liver were decreased as the dietary addition level of GSH was increased. The dietary addition of a mixture of glutamic acid, cysteine and glycine, or cysteine alone corresponding to 2.5% GSH resulted in a cholesterol-lowering effect which could not be distinguished from the effect of GSH in rats fed on the 25% casein diet. When 1.5% GSH was added to a low (10%) casein diet, the plasma cholesterol-lowering effect of GSH was also observed and the effect was comparable to that of cysteine. These results that dietary-added GSH has a plasma and liver cholesterol-lowering efficacy and that this effect is largely attributable to the cysteine residue of GSH rather than to the tripeptide itself or the other amino acid residues.

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Accession: 001817419

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