title: Role of PDE3B in insulin-induced glucose uptake, GLUT-4 translocation and lipogenesis in primary rat adipocytes.
abstract: In adipocytes, phosphorylation and activation of PDE3B is a key event in the antilipolytic action of insulin. The role of PDE4, another PDE present in adipocytes, is not yet known. In this work we investigate the role of PDE3B and PDE4 in insulin-induced glucose uptake, GLUT-4 translocation and lipogenesis. Inhibition of PDE3 (OPC3911, milrinone) but not PDE4 (RO 20-1724) lowered insulin-induced glucose uptake and lipogenesis, especially in the presence of isoproterenol (a general beta-adrenergic agonist), CL316243, a selective beta3-adrenergic agonist, and pituitary adenylate cyclase-activating peptide. The inhibitory effect of OPC3911 was associated with reduced translocation of GLUT-4 from the cytosol to the plasma membrane. Both OPC3911 and RO 20-1724 increased protein kinase A (PKA) activity and lipolysis. H89, a PKA inhibitor, did not affect OPC3911-mediated inhibition of insulin-induced glucose uptake and lipogenesis, whereas 8-pCPT-2'-O-Me-cAMP, an Epac agonist which mediates PKA independent cAMP signaling events, mimicked all the effects of OPC3911. Insulin-mediated activation of protein kinase B, a kinase involved in insulin-induced glucose uptake, was apparently not altered by OPC3911. In summary, our data suggest that PDE3B, but not PDE4, contributes to the regulation of insulin-induced glucose uptake, GLUT-4 translocation, and lipogenesis presumably by regulation of a cAMP/Epac signalling mechanisms.
authors.affiliation: Biomedical Center, C11, Department of Experimental Medical Science, 221 84 Lund, Sweden. emilia.zmuda-trzebiatowska@medkem.lu.se
authors.forename: Emilia
authors.initials: E
authors.lastname: Zmuda-Trzebiatowska
authors.forename: Alina
authors.initials: A
authors.lastname: Oknianska
authors.forename: Vincent
authors.initials: V
authors.lastname: Manganiello
authors.forename: Eva
authors.initials: E
authors.lastname: Degerman
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology*; D012368:4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinone / Q000494:pharmacology; D017667:Adipocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D000818:Animals; D015153:Blotting, Western; D000242:Cyclic AMP / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism; D054684:Cyclic Nucleotide Phosphodiesterases, Type 3; D054703:Cyclic Nucleotide Phosphodiesterases, Type 4; D004149:Dioxoles / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D004789:Enzyme Activation; D005947:Glucose / Q000378:metabolism*; D051275:Glucose Transporter Type 4 / Q000378:metabolism*; D020662:Guanine Nucleotide Exchange Factors / Q000235:genetics / Q000378:metabolism; D007328:Insulin / Q000494:pharmacology*; D007546:Isoquinolines / Q000494:pharmacology; D050155:Lipogenesis; D008297:Male; D015363:Quinolones / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction; D013449:Sulfonamides / Q000494:pharmacology
chemical_list: C473217:8-(4-chloro-phenylthio)-2'-O-methyladenosine-3'-5'-cyclic monophosphate; D004149:Dioxoles; C482601:Epac protein, mouse; D051275:Glucose Transporter Type 4; D020662:Guanine Nucleotide Exchange Factors; D007328:Insulin; D007546:Isoquinolines; D015363:Quinolones; C495694:Slc2a4 protein, rat; D013449:Sulfonamides; C076126:disodium (R,R)-5-(2-((2-(3-chlorophenyl)-2-hydroxyethyl)-amino)propyl)-1,3-benzodioxole-2,3-dicarboxylate; D012368:4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinone; C060853:OPC 3911; D000242:Cyclic AMP; D017868:Cyclic AMP-Dependent Protein Kinases; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D054684:Cyclic Nucleotide Phosphodiesterases, Type 3; D054703:Cyclic Nucleotide Phosphodiesterases, Type 4; C517293:Pde3b protein, mouse; C517294:Pde3b protein, rat; D005947:Glucose; C063509:N-(2-(4-bromocinnamylamino)ethyl)-5-isoquinolinesulfonamide