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1 Center for Human Nutrition, Washington University School of Medicine, Saint Louis, Missouri, United States; Department of Nutrition and Dietetics, Harokopio University, Athens, Missouri, Greece
2 Center for Human Nutrition, Washington University School of Medicine, St. Louis,, Missouri, United States
3 Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri, United States
* To whom correspondence should be addressed. E-mail: mittendb{at}wustl.edu.
Dyslipidemia, manifested by increased plasma triglyceride (TG), increased total and LDL-cholesterol concentrations and decreased HDL-cholesterol concentration, is an important risk factor for cardiovascular disease. Pre-menopausal women have a less atherogenic plasma lipid profile and a lower risk of cardiovascular disease than men, but this female advantage disappears after menopause. This suggests that female sex steroids affect lipoprotein metabolism. The impact of variations in the availability of ovarian hormones during the menstrual cycle on lipoprotein metabolism is not known. We therefore investigated whether very low-density lipoprotein (VLDL)-TG and VLDL-apolipoprotein B-100 (apoB-100) kinetics are different during the follicular phase (FP) and the luteal phase (LP) of the menstrual cycle. We studied seven healthy, pre-menopausal women (age: 27 ± 2 yr, body mass index: 25 ± 2 kg/m2) once during the FP and once during the LP. We measured VLDL-TG, VLDL-apoB-100, and plasma free fatty acid (FFA) kinetics by using stable isotope labeled tracers, VLDL subclass profile by nuclear magnetic resonance spectroscopy, whole-body fat oxidation by indirect calorimetry, and the plasma concentrations of lipoprotein lipase (LPL) and hepatic lipase (HL) with ELISA. VLDL-TG and VLDL-apoB-100 concentrations in plasma, VLDL-TG and VLDL-apoB-100 secretion rates and mean residence times, VLDL subclass distribution, FFA concentration and rate of appearance in plasma, whole-body substrate oxidation, and LPL and HL concentrations in plasma were not different during the FP and the LP. We conclude that VLDL-TG and VLDL-apoB-100 metabolism is not affected by menstrual cycle phase.
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F. Magkos, B. W. Patterson, and B. Mittendorfer Reproducibility of stable isotope-labeled tracer measures of VLDL-triglyceride and VLDL-apolipoprotein B-100 kinetics J. Lipid Res., May 1, 2007; 48(5): 1204 - 1211. [Abstract] [Full Text] [PDF] |
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