Lipoprotein (a) and its immune complexes in dyslipidemic subjects.
OBJECTIVE
To investigate plasma levels of lipoprotein (a) [Lp(a)] and low-density lipoprotein (LDL)-circulating immune complexes (IC) in subjects with various dyslipidemias.


METHODS
Plasma Lp(a), Lp(a)-IC, and LDL-IC levels were determined by enzyme-linked immunosorbent assays (ELISAs) in 198 subjects with various dyslipidemias and 34 control subjects.


RESULTS
Hypertriglyceridemic subjects exhibited the lowest plasma Lp(a) levels, while hypercholesterolemic subjects exhibited the highest levels. Subjects with mixed hyperlipidemia had intermediate plasma Lp(a) concentrations, which were significantly lower than those of subjects with normal lipid levels. Interestingly, we also found that hypertriglyceridemic subjects had the lowest plasma Lp(a)-IC and LDL-IC levels, while hypercholesterolemic subjects exhibited the highest levels. Triglyceride (TG) levels were negatively correlated with Lp(a) (r = -0.15, P < 0.05), Lp(a)-IC (r = -0.20, P < 0.01), and LDL-IC (r = -0.214, P < 0.01) concentrations. Furthermore, significantly positive relationships were found between Lp(a)-IC and Lp(a) levels (r = 0.65, P < 0.001) and between LDL-IC and LDL-C levels (r = 0.43, P < 0.001).


CONCLUSIONS
The results argue for a regulatory role of TG on plasma Lp(a) and its circulating immune complexes in subjects with various dyslipidemias. The circulating levels of these immune complexes levels are likely to change with different concentrations of Lp(a) and LDL.
Wang
Junjun
J
Department of Biochemistry, Jinling Hospital, Clinical School of Medicine College, Nanjing University, Nanjing, PR China. wangjj6@jlonline.com
Zhang
Chunni
C
Chen
Daning
D
Liu
Xiaozhuan
X
Feng
Xiaomei
X
D000368:Aged; D000975:Antioxidants / Q000494:pharmacology; D016022:Case-Control Studies; D004563:Electrochemistry; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D006949:Hyperlipidemias / Q000473:pathology; D008055:Lipids / Q000097:blood; D017270:Lipoprotein(a) / Q000737:chemistry*; D008077:Lipoproteins, LDL / Q000378:metabolism; D008297:Male; D014280:Triglycerides / Q000378:metabolism
D000975:Antioxidants; D008055:Lipids; D017270:Lipoprotein(a); D008077:Lipoproteins, LDL; D014280:Triglycerides