Abstract
High density lipoprotein (HDL) subclasses 2 and 3 isolated from male and female populations were further subfractionated by immunoaffinity techniques. Each subclass gave rise to 2 fractions: one contained apolipoprotein (apo) A-I but no apo A-II (LpAI); the other contained apo A-I and apo A-II (LpAI,AII). The bulk fraction (HDL-3(LpAI,AII)) comprised over 70% of total HDL and was present in similar concentrations in both populations. There were, however, significant male-female differences in plasma levels of the minor HDL-3 fraction i.e. HDL-3(LpAI). Females had significantly higher plasma concentrations of both fractions within HDL-2. These fractions also exhibited strong, positive correlations with total HDL cholesterol concentrations, both in males as well as females. It suggests that metabolic activities giving rise to both HDL-2(LpAI) and HDL-2(LpAI,AII) determine plasma HDL cholesterol concentrations. Several similarities were noted between the male and female populations. Triglyceridaemia was negatively correlated with HDL-2 derived fractions and positively correlated with the bulk fraction HDL-3(LpAI,AII). Compositional data showed that the fraction (LpAI) had a lower esterified cholesterol to total cholesterol ratio t...Continue Reading
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