Arteriosclerosis and Thrombosis, Vol 13, 1558-1566, Copyright © 1993 by American Heart Association

ARTICLES

The relation of lipoprotein[a] concentrations and apolipoprotein[a] phenotypes with asymptomatic atherosclerosis in subjects of the Atherosclerosis Risk in Communities (ARIC) Study

SA Brown, JD Morrisett, E Boerwinkle, R Hutchinson and W Patsch
Department of Medicine, Baylor College of Medicine, Houston, TX 77030.

Plasma levels of lipoprotein[a] (Lp[a]) are associated with increased risk of coronary artery disease and show an inverse correlation with apolipoprotein[a] (apo[a]) molecular weight. We determined Lp[a] levels and apo[a] phenotypes in 171 cases with preclinical extracranial carotid atherosclerosis as ascertained by B-mode ultrasound and in 274 control subjects free of carotid atherosclerosis. Lp[a] protein levels measured by enzyme-linked immunosorbent assay ranged from 4 to 361 micrograms/mL in cases and from 2 to 392 micrograms/mL in controls, but median levels of Lp[a] were higher in cases than in controls (51 micrograms/mL versus 33 micrograms/mL, P < .003). In both groups, all 11 apo[a] polymorphs that are resolved by the procedure used were present, resulting in 43 and 39 different apo[a] phenotypes in cases and controls, respectively. An inverse relation between apo[a] polymorph size and Lp[a] level was observed in both cases (r = -0.49, P < .001) and controls (r = -0.34, P < .001). Apo[a] phenotype distributions were similar in cases and controls. However, in 17 phenotypes with three or more subjects per group, the difference of mean Lp[a] concentrations between cases and controls was 32 +/- 36 micrograms/mL (mean +/- SD). Thus, the higher Lp[a] levels in cases were not associated with a greater prevalence of small apo[a] polymorphs. Stepwise logistic regression analyses of known risk factors for coronary heart disease showed that plasma Lp[a] concentration was an independent predictor of case-control status, while Lp[a] phenotype was not, irrespective of the presence or absence of Lp[a] concentration in the model.(ABSTRACT TRUNCATED AT 250 WORDS)

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