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Women have significantly higher plasma concentrations of high-density lipoprotein (HDL) and apolipoprotein (apo) A-I than men. Human HDL consists of two major species of apoA-I-containing lipoproteins: LpA-I (lipoprotein containing apoA-I but not apoA-II) and LpA-I:A-II (lipoprotein containing both apoA-I and apoA-II). LpA-I is itself heterogeneous and contains several subclasses of different size and composition. We analyzed LpA-I subclasses in 12 male and 12 female healthy normolipidemic adults. LpA-I concentrations were significantly higher in women (72.4 +/- 5.6 mg/dL) than in men (50.2 +/- 2.2 mg/dL) (P &lt; .05). LpA-I was preparatively isolated from fasting plasma by immunoaffinity chromatography. Gel filtration chromatography was then used to isolate LpA-I subclasses based on size. Three major subclasses were eluted: large, medium, and small LpA-I. No differences between men and women in the size or composition of individual LpA-I subclasses were observed. In contrast, the distribution and plasma concentration of LpA-I subclasses were significantly different between men and women. As a fraction of total LpA-I, the large LpA-I was significantly higher (68.0% to 48.4%) and the medium LpA-I was significantly lower (26.4% to 44.9%) in women than in men. The fraction of small LpA-I was not significantly different. Plasma concentrations of large LpA-I in women (49.2 mg/dL) were twice that in men (24.3 mg/dL), whereas plasma concentrations of medium LpA-I (19.1 mg/dL versus 22.5 mg/dL) and small LpA-I (4.0 mg/dL versus 3.0 mg/dL) were similar in women and men.(ABSTRACT TRUNCATED AT 250 WORDS)

Distribution of subclasses of HDL containing apoA-I without apoA-II (LpA-I) in normolipidemic men and women.