title: Kinetics of very-low-density lipoprotein apolipoprotein B-100 in normolipidemic subjects: pooled analysis of stable-isotope studies.
abstract: To further explore the physiology of very-low-density lipoprotein (VLDL) apolipoprotein B-100 (apoB), we performed a pooled analysis of 21 reports based on the intravenous administration of stable isotope-labeled amino acids in a total of 154 healthy normolipidemic subjects. Prandial status was the most significant independent predictor (P < .001) of the hepatic secretion of apoB, which was higher in the fed state compared with the fasted state (1,819 +/- 188 v 1,046 +/- 61 mg/d, P < .001). In the fed state, apoB secretion increased with age (P = .003) and tended to be higher in men compared with women (P = .0065). The fractional catabolism of VLDL apoB decreased with weight (P = .0038) and was lower in men versus women (8.38 +/- 0.55 v 12.59 +/- 1.65 pools/d, P = .007), as well as patients that were carriers of the E4 allele compared with those who were not carriers of this allele (5.52 +/- 0.49 v 9.58 +/- 0.87 pools/d, P < .001). The VLDL apoB concentration in both the fed and fasted states was dependent on both the rate of hepatic production and fractional clearance of apoB. Plasma cholesterol, triglyceride, low-density lipoprotein (LDL) cholesterol, and high-density lipoprotein (HDL) cholesterol concentrations in the fasted state were principally determined by the fractional catabolism of VLDL apoB (P< .005). These findings suggest that under physiologic conditions in healthy individuals, the transport of VLDL apoB in plasma is predominantly determined by age, sex, body weight, apoE genotype, and prandial status.
authors.affiliation: University Department of Medicine, University of Western Australia, Royal Perth Hospital, Australia.
authors.forename: G F
authors.initials: GF
authors.lastname: Watts
authors.forename: P
authors.initials: P
authors.lastname: Moroz
authors.forename: P H
authors.initials: PH
authors.lastname: Barrett
mesh_terms: D053299:Apolipoprotein B-100; D001055:Apolipoproteins B / Q000097:blood* / Q000378:metabolism; D001057:Apolipoproteins E / Q000235:genetics; D002247:Carbon Isotopes; D003903:Deuterium; D005215:Fasting; D005260:Female; D005502:Food; D005838:Genotype; D006801:Humans; D007554:Isotopes; D007700:Kinetics; D008079:Lipoproteins, VLDL / Q000097:blood*; D008099:Liver / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009587:Nitrogen Isotopes; D012727:Sex Characteristics
chemical_list: D053299:Apolipoprotein B-100; D001055:Apolipoproteins B; D001057:Apolipoproteins E; D002247:Carbon Isotopes; D007554:Isotopes; D008079:Lipoproteins, VLDL; D009587:Nitrogen Isotopes; D003903:Deuterium