Effect of weight loss on VLDL-triglyceride and apoB-100 kinetics in women with abdominal obesity.
The effects of obesity and weight loss on lipoprotein kinetics were evaluated in six lean women [body mass index (BMI): 21 +/- 1 kg/m(2)] and seven women with abdominal obesity (BMI: 36 +/- 1 kg/m(2)). Stable isotope tracer techniques, in conjunction with compartmental modeling, were used to determine VLDL-triglyceride (TG) and apolipoprotein B-100 (apoB-100) secretion rates in lean women and in obese women before and after 10% weight loss. VLDL-TG and VLDL-apoB-100 secretion rates were similar in lean and obese women. Weight loss decreased the rate of VLDL-TG secretion by approximately 40% (from 0.41 +/- 0.05 to 0.23 +/- 0.03 micromol x kg fat-free mass(-1) x min(-1); P < 0.05). The relative decline in VLDL-TG produced from nonsystemic fatty acids, derived from intraperitoneal and intrahepatic TG, was greater (61 +/- 7%) than the decline in VLDL-TG produced from systemic fatty acids, predominantly derived from subcutaneous TG (25 +/- 8%; P < 0.05). Weight loss did not affect VLDL-apoB-100 secretion rate. We conclude that weight loss decreases the rate of VLDL-TG secretion in women with abdominal obesity, primarily by decreasing the availability of nonsystemic fatty acids. There is a dissociation in the effect of weight loss on VLDL-TG and apoB-100 metabolic pathways that may affect VLDL particle size.
Mittendorfer
Bettina
B
Department of Internal Medicine and Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
Patterson
Bruce W
BW
Klein
Samuel
S
D000005:Abdomen; D000328:Adult; D053299:Apolipoprotein B-100; D001055:Apolipoproteins B / Q000378:metabolism*; D001823:Body Composition; D005227:Fatty Acids / Q000378:metabolism; D005260:Female; D006801:Humans; D007328:Insulin / Q000097:blood; D007700:Kinetics; D008055:Lipids / Q000097:blood; D008079:Lipoproteins, VLDL / Q000378:metabolism*; D009765:Obesity / Q000473:pathology / Q000503:physiopathology*; D009994:Osmolar Concentration; D014280:Triglycerides / Q000378:metabolism*; D015431:Weight Loss
D053299:Apolipoprotein B-100; D001055:Apolipoproteins B; D005227:Fatty Acids; D007328:Insulin; D008055:Lipids; D008079:Lipoproteins, VLDL; D014280:Triglycerides; C030106:very low density lipoprotein triglyceride