Inositolphosphoglycans possibly mediate the effects of glucagon-like peptide-1(7-36)amide on rat liver and adipose tissue

✍ Scribed by Luis Márquez; María A. Trapote; Miguel A. Luque; I. Valverde; María L. Villanueva-Peñacarrillo

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 108 KB
• Volume: 16
• Category: Article
• ISSN: 0263-6484
• DOI: 10.1002/(sici)1099-0844(199803)16:1<51::aid-cbf767>3.0.co;2-t

✦ Synopsis

Insulin-like eects of glucagon-like peptide-1(7-36)amide (GLP-1) in rat liver, skeletal muscle and fat, and also the presence of GLP-1 receptors in these extrapancreatic tissues, have been documented. In skeletal muscle and liver, the action of GLP-1 is not associated with an activation of adenylate cyclase, and in cultured murine myocytes and hepatoma cell lines, it was found that GLP-1 provokes the generation of inositolphosphoglycan molecules (IPGs), which are considered second messengers of insulin action. In the present work, we document in isolated normal rat adipocytes and hepatocytes that GLP-1 exerts a rapid decrease of the radiolabelled glycosylphosphatidylinositols (GPIs) Ð precursors of IPGs Ð in the same manner as insulin, indicating their hydrolysis and the immediate shortlived generation of IPGs. Thus, IPGs could be mediators in the GLP-1 actions in adipose tissue and liver, as well as in skeletal muscle, through GLP-1 receptors which are, at least functionally, dierent from that of the pancreatic B-cell.