Add time:07/20/2019         Source:sciencedirect.com

In order to study the relation of homocysteine and lipid metabolism to atherogenesis, rabbits were fed a synthetic atherogenic diet and treated with parenteral thioretinaco (N-homocysteine thiolactonyl retinamido cobalamin), thioretinamide (N-homocysteine thiolactonyl retinamide) or homocysteine thiolactone hydrochloride. All three substances were found to increase dietary atherogenesis. Thioretinaco and thioretinamide increase total homocysteine of serum, but there is no effect of parenteral homocysteine thiolactone hydrochloride on serum homocysteine. The synthetic diet with corn oil significantly lowers serum homocysteine, compared either to baseline chow diet or to the synthetic 'diet with butter. Atherogenesis is correlated with total homocysteine, total cholesterol and LDL + VLDL cholesterol, and serum homocysteine is correlated with total cholesterol, LDL + VLDL, and HDL cholesterol in the total sample. Both synthetic diets elevate serum cholesterol, triglycerides and LDL + VLDL, but not HDL, compared to baseline values. Thioretinamide causes significant elevation of cholesterol and LDL + VLDL, compared to controls. The results show that increased dietary saturated fat and cholesterol cause deposition of lipids within the arteriosclerotic plaques produced by homocysteine, converting fibrous to fibrolipid plaques. Facilitation of atherogenesis is attributed to the effect of homocysteine on artery wall, either from parenteral homocysteine or from the increased synthesis of homocysteine from methionine, produced by thioretinaco and thioretinamide.

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