CD36 regulates fatty acid composition and sensitivity to insulin in 3T3-L1 adipocytes. 2007

K Kontrová, and J Zídková, and B Bartos, and V Skop, and J Sajdok, and L Kazdová, and K Mikulík, and P Mlejnek, and V Zídek, and M Pravenec
Department of Biochemistry and Microbiology, Institute of Chemical Technology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.

In the current study, we tested a hypothesis that CD36 fatty acid (FA) transporter might affect insulin sensitivity by indirect effects on FA composition of adipose tissue. We examined the effects of CD36 downregulation by RNA interference in 3T3-L1 adipocytes on FA transport and composition and on sensitivity to insulin action. Transfected 3T3-L1 adipocytes, without detectable CD36 protein, showed reduced neutral lipid levels and significant differences in FA composition when levels of essential FA and their metabolites were lower or could not be detected including gamma linolenic (C18:3 n6), eicosadienic (C20:2 n6), dihomo-gamma linolenic (C20:3 n6), eicosapentaenoic (EPA) (C20:5 n3), docosapentaenoic (DPA) (C22:5 n3), and docosahexaenoic (DHA) (C22:6 n3) FA. Transfected 3T3-L1 adipocytes exhibited a significantly higher n6/n3 FA ratio, reduced 5-desaturase and higher 9-desaturase activities. These lipid profiles were associated with a significantly reduced insulin-stimulated glucose uptake (4.02+/-0.1 vs. 8.42+/-0.26 pmol.10(-3) cells, P=0.001). These findings provide evidence that CD36 regulates FA composition thereby affecting sensitivity to insulin action in 3T3-L1 adipocytes.

UI MeSH Term Description Entries
D007328 Insulin A 51-amino acid pancreatic hormone that plays a major role in the regulation of glucose metabolism, directly by suppressing endogenous glucose production (GLYCOGENOLYSIS; GLUCONEOGENESIS) and indirectly by suppressing GLUCAGON secretion and LIPOLYSIS. Native insulin is a globular protein comprised of a zinc-coordinated hexamer. Each insulin monomer containing two chains, A (21 residues) and B (30 residues), linked by two disulfide bonds. Insulin is used as a drug to control insulin-dependent diabetes mellitus (DIABETES MELLITUS, TYPE 1). Iletin,Insulin A Chain,Insulin B Chain,Insulin, Regular,Novolin,Sodium Insulin,Soluble Insulin,Chain, Insulin B,Insulin, Sodium,Insulin, Soluble,Regular Insulin
D005227 Fatty Acids Organic, monobasic acids derived from hydrocarbons by the equivalent of oxidation of a methyl group to an alcohol, aldehyde, and then acid. Fatty acids are saturated and unsaturated (FATTY ACIDS, UNSATURATED). (Grant & Hackh's Chemical Dictionary, 5th ed) Aliphatic Acid,Esterified Fatty Acid,Fatty Acid,Fatty Acids, Esterified,Fatty Acids, Saturated,Saturated Fatty Acid,Aliphatic Acids,Acid, Aliphatic,Acid, Esterified Fatty,Acid, Saturated Fatty,Esterified Fatty Acids,Fatty Acid, Esterified,Fatty Acid, Saturated,Saturated Fatty Acids
D000090943 Delta-5 Fatty Acid Desaturase A fatty acid desaturase that is a rate-limiting enzyme for the conversion from dihomo-gamma-linolenic acid and EICOSATETRAENOATE (ETA) in the synthesis of ARACHIDONIC ACID and EICOSAPENTAENOATE (EPA). It is also involved in the biosynthesis of unsaturated fatty acids from the polyunsaturated fatty acids (PUFA), LINOLEIC ACID (LA), and ALPHA LINOLENIC ACID (ALA) precursors and plays an important role in the metabolism of inflammatory lipids including PROSTAGLANDIN E2. Delta 5 Desaturase,Delta-5-FADase,Fatty Acid Delta-5-Desaturase,5 Desaturase, Delta,Acid Delta-5-Desaturase, Fatty,Delta 5 FADase,Delta-5-Desaturase, Fatty Acid,Desaturase, Delta 5,Fatty Acid Delta 5 Desaturase
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013230 Stearoyl-CoA Desaturase An enzyme that catalyzes the formation of oleoyl-CoA, A, and water from stearoyl-CoA, AH2, and oxygen where AH2 is an unspecified hydrogen donor. Stearyl-CoA Desaturase,Stearate Desaturase,delta-9 Desaturase,Desaturase, Stearate,Desaturase, Stearoyl-CoA,Desaturase, Stearyl-CoA,Desaturase, delta-9,Stearoyl CoA Desaturase,Stearyl CoA Desaturase,delta 9 Desaturase
D014162 Transfection The uptake of naked or purified DNA by CELLS, usually meaning the process as it occurs in eukaryotic cells. It is analogous to bacterial transformation (TRANSFORMATION, BACTERIAL) and both are routinely employed in GENE TRANSFER TECHNIQUES. Transfections
D017667 Adipocytes Cells in the body that store FATS, usually in the form of TRIGLYCERIDES. WHITE ADIPOCYTES are the predominant type and found mostly in the abdominal cavity and subcutaneous tissue. BROWN ADIPOCYTES are thermogenic cells that can be found in newborns of some species and hibernating mammals. Fat Cells,Lipocytes,Adipocyte,Cell, Fat,Cells, Fat,Fat Cell,Lipocyte
D044943 Fatty Acid Desaturases A family of enzymes that catalyze the stereoselective, regioselective, or chemoselective syn-dehydrogenation reactions. They function by a mechanism that is linked directly to reduction of molecular OXYGEN. Acyl CoA Desaturase,Enoyl CoA Reductase,Fatty Acid Desaturase,Fatty Acid Desaturating Enzymes,Acyl CoA Desaturases,Enoyl CoA Reductases,Acid Desaturase, Fatty,CoA Desaturase, Acyl,CoA Reductase, Enoyl,Desaturase, Acyl CoA,Desaturase, Fatty Acid,Desaturases, Fatty Acid,Reductase, Enoyl CoA,Reductases, Enoyl CoA
D051379 Mice The common name for the genus Mus. Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus
D018955 CD36 Antigens Leukocyte differentiation antigens and major platelet membrane glycoproteins present on MONOCYTES; ENDOTHELIAL CELLS; PLATELETS; and mammary EPITHELIAL CELLS. They play major roles in CELL ADHESION; SIGNAL TRANSDUCTION; and regulation of angiogenesis. CD36 is a receptor for THROMBOSPONDINS and can act as a scavenger receptor that recognizes and transports oxidized LIPOPROTEINS and FATTY ACIDS. Antigens, CD36,OKM5 Antigen,Platelet Glycoprotein IV,Platelet Membrane Glycoprotein IIIb,Receptors, Thrombospondin,Scavenger Receptors, Class B, Type I,Thrombospondin Receptors,Adipocyte Membrane Protein p88,CD36 Antigen,CD36 Antigen (Collagen Type I Receptor, Thrombospondin Receptor),CD36 Fatty Acid Transporter,CD36 Protein,FAT (Fatty Acid Translocase) - CD36 Antigen,GPIIIb Platelet Glycoprotein,GPIV Platelet Glycoprotein,Platelet Glycoprotein IIIb,Platelet Membrane Glycoprotein IV,SR-BI Protein,SR-BI Receptor,Thrombospondin Receptor,Antigen, CD36,Antigen, OKM5,Glycoprotein IIIb, Platelet,Glycoprotein IV, Platelet,Platelet Glycoprotein, GPIIIb,Platelet Glycoprotein, GPIV,Receptor, SR-BI,Receptor, Thrombospondin,SR BI Protein,SR BI Receptor

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