PMID: 6403042Apr 13, 1983Paper

Subpopulations of apolipoprotein A-I in human high-density lipoproteins. Their metabolic properties and response to drug therapy

Biochimica Et Biophysica Acta
R F AtmehC J Packard

Abstract

In this study immunological procedures were used to detect and quantify high-density lipoprotein (HDL) particles of differing apolipoprotein A composition. In the plasma of eight healthy female subjects, 45% of the total apolipoprotein A-I existed in particles (called '(AI)HDL') devoid of apolipoprotein A-II. The remainder circulated in association with apolipoprotein A-II at a molar ratio of approximately 1:1. Nicotinic acid selectively raised the plasma apolipoprotein A-I/A-II ratio by increasing the proportion of (AI)HDL particles. Probucol produced the opposite effect, lowering the plasma concentration of these particles. The kinetic properties of apolipoprotein A-I in total HDL and in the (AI)HDL particle were the same despite the fact that apolipoprotein A-I equilibration between these two species was incomplete. Therefore, there appear to be at least two apolipoprotein A-containing particle populations in HDL which are immunochemically and metabolically distinct.

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Citations

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