Kinetics of prebeta1 HDL and alphaHDL in type II diabetic patients.
BACKGROUND
The aim of this study was to analyze the recycling of high density lipoprotein (HDL) in six type II diabetic patients compared with six control subjects by endogenous labelling of apolipoprotein A-I (Apo A-I) with stable isotope Apo A.


METHODS
The -I-HDL kinetics were performed by infusion of (5.5.5-(2)H3)-leucine for 14 h. The prebeta1 and alphaHDL were separated by gel filtration fast protein liquid chromatrography system (FPLC). Kinetics of isotopic enrichment of Apo A-I were analyzed with a multi-compartmental model software (SAAM II, SAAM Institute, Seattle, WA).


RESULTS
Plasma Apo A-I concentration was decreased in patients with type II diabetes as a result of a decrease in Apo A-I-alphaHDL (P < 0.05). Diabetic patients were also characterized by an increased relative contribution of Apo A-I in prebeta1 HDL (18.3 +/- 2.8% vs 11.9 +/- 3.7%, P < 0.01). The synthetic rate of prebeta1 HDL was slightly increased in diabetic patients compared with control (NS) and an increase of recycling rate of alpha to prebeta1 HDL was observed (11.67 +/- 3.14 d(-1) vs 7.09 +/- 4.51 d(-1), P < 0.05). The clearance rate of Apo A-I was higher in diabetic patients (P < 0.05 for Apo A-I-prebeta1 HDL and P < 0.005 for Apo A-I-alphaHDL).


CONCLUSIONS
This study suggests that the usual increase in prebeta1 HDL in type II diabetic patients is mainly related to an increased conversion rate of alpha to prebeta1 HDL.
Chétiveaux
M
M
Inserm U539, Centre de Recherche en Nutrition Humaine, CHU Hôtel Dieu, Nantes, France.
Lalanne
F
F
Lambert
G
G
Zair
Y
Y
Ouguerram
K
K
Krempf
M
M
D000328:Adult; D016632:Apolipoprotein A-I / Q000097:blood; D002850:Chromatography, Gel / Q000379:methods; D002853:Chromatography, Liquid / Q000379:methods; D003198:Computer Simulation; D003924:Diabetes Mellitus, Type 2 / Q000097:blood*; D005260:Female; D053442:High-Density Lipoproteins, Pre-beta; D006801:Humans; D008055:Lipids / Q000097:blood; D008075:Lipoproteins, HDL / Q000097:blood*; D008297:Male; D008875:Middle Aged; D008954:Models, Biological
D016632:Apolipoprotein A-I; D053442:High-Density Lipoproteins, Pre-beta; D008055:Lipids; D008075:Lipoproteins, HDL