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Caloric restriction and exercise increase plasma ANGPTL4 levels in humans via elevated free fatty acids

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Author: Kersten, S. · Lichtenstein, L. · Steenbergen, E. · Mudde, K. · Hendriks, H.F.J. · Hesselink, M.K. · Schrauwen, P. · Müller, M.
Type:article
Date:2009
Institution: TNO Kwaliteit van Leven
Source:Arteriosclerosis, Thrombosis, and Vascular Biology, 6, 29, 969-974
Identifier: 241583
doi: doi:10.1161/ATVBAHA.108.182147
Keywords: Nutrition · Biomedical Research · ANGPTL4 · Caloric restriction · Free fatty acids · angiopoietin · angiopoietin like protein 4 · beta adrenergic receptor stimulating agent · fatty acid · unclassified drug · ANGPTL4 protein, human · Angptl4 protein, mouse · antilipemic agent · Fiaf protein, rat · lipid emulsion · messenger RNA · salbutamol · adult · animal cell · article · blood sampling · caloric restriction · cell strain HepG2 · controlled study · enzyme linked immunosorbent assay · exercise · fatty acid blood level · female · gene expression · genetic variability · hepatoma cell · human · human cell · human experiment · intestine cell · male · mouse · muscle cell · nonhuman · normal human · priority journal · protein blood level · rat · animal · blood · cell culture · clinical trial · controlled clinical trial · genetic transfection · genetics · heart muscle cell · intestine · liver tumor · metabolism · middle aged · randomized controlled trial · time · upregulation · Adrenergic beta-Agonists · Adult · Albuterol · Angiopoietins · Animals · Antilipemic Agents · Caloric Restriction · Cells, Cultured · Enzyme-Linked Immunosorbent Assay · Exercise · Fat Emulsions, Intravenous · Fatty Acids, Nonesterified · Humans · Intestines · Liver Neoplasms · Male · Mice · Middle Aged · Myocytes, Cardiac · Rats · RNA, Messenger · Time Factors · Transfection · Up-Regulation · Young Adult

Abstract

OBJECTIVE-: Plasma lipoprotein levels are determined by the balance between lipoprotein production and clearance. Recently, angiopoietin-like protein 4 (ANGPTL4) was uncovered as a novel endocrine factor that potently raises plasma triglyceride levels by inhibiting triglyceride clearance. However, very little is known about ANGPTL4 in human. Here we set out to identify physiological determinants of plasma ANGPTL4 levels in humans, focusing on the effect of energy restriction and plasma FFAs. METHODS AND RESULTS-: We developed an ELISA for quantitative measurement of ANGPTL4 in human plasma. Using this assay we found major variations in baseline plasma ANGPTL4 levels between individuals. Within an individual, plasma ANGPTL4 levels remain stable throughout the day but increase significantly in response to long-term fasting, chronic caloric restriction, and endurance exercise. Intralipid injection as well as treatment with a β-adrenergic agonist, both of which lead to elevated plasma FFA levels, increased plasma ANGPTL4 levels compared to control treatment. Fatty acids markedly induced ANGPTL4 gene expression in rat hepatoma FAO cells, human primary myocytes, and mouse intestinal MSIE cells. CONCLUSION-: In conclusion, our results show that plasma ANGPTL4 levels are increased by fasting, caloric restriction, and exercise, which is likely mediated by elevated plasma FFAs. © 2009 American Heart Association, Inc.