title: Serum apolipoprotein A-I levels: relationship to lipoprotein lipid levels and selected demographic variables.
abstract: Serum apolipoprotein A-I (apo A-I) and lipoprotein cholesterol and triglycerides were measured in 289 persons randomly selected from a Northern California industrial population in 1974-1976. Apo A-I and high density lipoprotein (HDL) cholesterol were strongly correlates with one another and both were inversely correlated with very low density lipoprotein (VLDL) triglycerides. The decrease in HDL-cholesterol with increasing VLDL-triglycerides was relatively much larger than the concomitant decrease in apo A-I. The relative decrease in the sum of cholesterol and triglycerides in the HDL fraction was similar to that for apo A-I, suggesting that the decreasing HDL-cholesterol:apo A-I ratio with increasing VLDL-triglycerides is due in large part to reciprocal transfer of cholesteryl esters for triglycerides between HDL and VLDL. Mean apo A-I level was 16 mg/dl higher in women not taking exogenous sex steroids than in men, 31 mg/dl higher in women taking estrogens without progestins and 10 mg/dl higher in contraceptive drug users than in other women, and 8 mg/dl higher in black than in white men. The first two of these differences were statistically significant. Apo A-I level was unrelated to age, but increased with ethanol consumption and decreased with adiposity. An inverse relationship between Apo A-I and cigarette smoking was found among women.
mesh_terms: D000328:Adult; D000428:Alcohol Drinking; D000704:Analysis of Variance; D016632:Apolipoprotein A-I; D001053:Apolipoproteins / Q000097:blood*; D002140:California; D002784:Cholesterol / Q000097:blood*; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D015243:Cholesterol, VLDL; D003276:Contraceptives, Oral / Q000494:pharmacology; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008074:Lipoproteins / Q000097:blood*; D008075:Lipoproteins, HDL / Q000097:blood; D008077:Lipoproteins, LDL / Q000097:blood; D008079:Lipoproteins, VLDL / Q000097:blood; D008297:Male; D008875:Middle Aged; D011897:Random Allocation; D012907:Smoking; D014280:Triglycerides / Q000097:blood
chemical_list: D016632:Apolipoprotein A-I; D001053:Apolipoproteins; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D015243:Cholesterol, VLDL; D003276:Contraceptives, Oral; D008074:Lipoproteins; D008075:Lipoproteins, HDL; D008077:Lipoproteins, LDL; D008079:Lipoproteins, VLDL; D014280:Triglycerides; D002784:Cholesterol