Relationship between high-density lipoprotein-cholesterol and malondialdehyde-modified low-density lipoprotein concentrations.
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.
Kondo
Akira
A
Department of Laboratory Medicine, Hamamatsu University School of Medicine, Shizuoka, Japan. kondoh@daiichichem.co.jp
Li
Jiangzhen
J
Manabe
Mitsuhisa
M
Saito
Kazunori
K
Kanno
Takashi
T
Maekawa
Masato
M
D000328:Adult; D000368:Aged; D001055:Apolipoproteins B / Q000097:blood / Q000378:metabolism; D008076:Cholesterol, HDL / Q000097:blood / Q000378:metabolism*; D008078:Cholesterol, LDL / Q000097:blood / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008315:Malondialdehyde / Q000097:blood / Q000378:metabolism*; D008875:Middle Aged; D018384:Oxidative Stress / Q000502:physiology*; D014280:Triglycerides / Q000097:blood / Q000378:metabolism
D001055:Apolipoproteins B; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D014280:Triglycerides; D008315:Malondialdehyde