title: FATP1 is an insulin-sensitive fatty acid transporter involved in diet-induced obesity.
abstract: Fatty acid transport protein 1 (FATP1), a member of the FATP/Slc27 protein family, enhances the cellular uptake of long-chain fatty acids (LCFAs) and is expressed in several insulin-sensitive tissues. In adipocytes and skeletal muscle, FATP1 translocates from an intracellular compartment to the plasma membrane in response to insulin. Here we show that insulin-stimulated fatty acid uptake is completely abolished in FATP1-null adipocytes and greatly reduced in skeletal muscle of FATP1-knockout animals while basal LCFA uptake by both tissues was unaffected. Moreover, loss of FATP1 function altered regulation of postprandial serum LCFA, causing a redistribution of lipids from adipocyte tissue and muscle to the liver, and led to a complete protection from diet-induced obesity and insulin desensitization. This is the first in vivo evidence that insulin can regulate the uptake of LCFA by tissues via FATP1 activation and that FATPs determine the tissue distribution of dietary lipids. The strong protection against diet-induced obesity and insulin desensitization observed in FATP1-null animals suggests FATP1 as a novel antidiabetic target.
authors.affiliation: Palo Alto Medical Foundation Research Institute, Ames Building, 795 El Camino Real, Palo Alto, CA 94301, USA.
authors.forename: Qiwei
authors.initials: Q
authors.lastname: Wu
authors.forename: Angelica M
authors.initials: AM
authors.lastname: Ortegon
authors.forename: Bernice
authors.initials: B
authors.lastname: Tsang
authors.forename: Holger
authors.initials: H
authors.lastname: Doege
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Feingold
authors.forename: Andreas
authors.initials: A
authors.lastname: Stahl
mesh_terms: D017667:Adipocytes / Q000187:drug effects / Q000378:metabolism; D000818:Animals; D001692:Biological Transport / Q000187:drug effects / Q000235:genetics; D004042:Dietary Fats, Unsaturated / Q000378:metabolism / Q000633:toxicity; D050612:Fatty Acid Transport Proteins / Q000819:agonists* / Q000235:genetics / Q000502:physiology*; D005231:Fatty Acids, Unsaturated / Q000097:blood / Q000378:metabolism*; D007328:Insulin / Q000494:pharmacology*; D008099:Liver / Q000378:metabolism / Q000473:pathology; D024821:Metabolic Syndrome / Q000235:genetics*; D051379:Mice; D018345:Mice, Knockout; D018482:Muscle, Skeletal / Q000187:drug effects / Q000378:metabolism; D009765:Obesity / Q000139:chemically induced / Q000235:genetics*
chemical_list: D004042:Dietary Fats, Unsaturated; D050612:Fatty Acid Transport Proteins; D005231:Fatty Acids, Unsaturated; D007328:Insulin; C493569:Slc27a1 protein, mouse