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- W2025167140 abstract "Oxidation of LDL contributes to endothelial dysfunction and atherosclerosis. This process could be associated with hyperhomocysteinemia, a condition that can be reduced after folic acid treatment. Because a reduction in LDL oxidation may improve endothelial function, we studied the effect of some vitamins (folic acid, 5-methyltetrahydrofolic acid, and vitamin B-12) on LDL oxidation, either in the presence or absence of homocysteine. For this purpose, two in vitro systems were used: an endothelial cell-catalyzed LDL oxidation system and a cell-free copper-initiated LDL oxidation system. The kinetics of copper-catalyzed LDL oxidation was determined by continuous monitoring of the production of conjugated dienes in the reaction medium. TBARS production, a parameter of lipid peroxidation, was also evaluated. In both in vitro systems, only 5-methyltetrahydrofolic acid was able to decrease TBARS production in a concentration-dependent manner, independently of the presence or absence of homocysteine. In the copper-induced LDL oxidation system, vitamin B-12 and 5-methyltetrahydrofolic acid increased the lag time of conjugated diene production by 25 and 47%, respectively, suggesting that both vitamins in this system had antioxidant properties. Folic acid was unable to show antioxidant properties when included in either in vitro system. The results demonstrate that 5-methyltetrahydrofolic acid and vitamin B-12 are important protective agents against LDL oxidative modifications." @default.
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- W2025167140 date "2005-03-01" @default.
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- W2025167140 title "Effect of homocysteine, folates, and cobalamin on endothelial cell‐ and copper‐induced LDL oxidation" @default.
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- W2025167140 doi "https://doi.org/10.1007/s11745-005-1380-6" @default.
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