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  • Title: Relationship between high-density lipoprotein-cholesterol and malondialdehyde-modified low-density lipoprotein concentrations.
    Author: Kondo A, Li J, Manabe M, Saito K, Kanno T, Maekawa M.
    Journal: J Atheroscler Thromb; 2003; 10(2):72-8. PubMed ID: 12740480.
    Abstract:
    Several reports have suggested that HDL has anti-oxidative actions. We investigated the relationship between HDL-cholesterol (HDL-C) and malondialdehyde-modified LDL (MDA-LDL) concentrations using enzyme linked immunosolvent assay. We divided our study subjects into four groups on the basis of concentrations of triglyceride (TG) and HDL-C by the following lipid profiles: serum TG < or = 1.69 mmol/L and HDL-C > or = 1.16 mmol/L (control group, n = 26); TG >1.69 and HDL-C < or = 1.16 (high TG group, n = 22); TG >1.69 and HDL-C < or = 0.91 (high TG & low HDL group, n = 67); TG < or = 1.69 and HDL-C < or = 0.91 (low HDL group, n = 21). MDA-LDL concentrations, MDA-LDL/apolipoprotein B (apo B) ratio, and LDL size were different between subjects in high TG & low HDL and control groups. MDA-LDL concentrations in both high TG and low HDL groups did not differ significantly from those in the control. However, MDA-LDL/apo B ratio in low HDL group was significantly higher than that in the control (P < 0.05). The MDA-LDL/apo B ratio reflects the extent of MDA modification of apo B in LDL. Therefore, our data suggest that as HDL-C concentrations fall, the extent of MDA modification per one LDL particle increases. Moreover, accompanied by high TG concentration, LDL size in subjects with lower HDL-C concentrations became smaller.
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