Enteral enhancement of glucose disposition by both insulin-dependent and insulin-independent processes. A physiological role of glucagon-like peptide I.

Published

Journal Article

Glucagon-like peptide I (GLP-I)(7-36) amide is secreted by intestinal L-cells in response to food ingestion. GLP-I is a potent insulin secretagogue and also inhibits glucagon release. In addition, when given to humans in pharmacological amounts, GLP-I increases glucose disposal independent of its effects on islet hormone secretion. To test the hypothesis that this extrapancreatic effect of GLP-I on glucose disposition is present at physiological levels of GLP-I, we performed intravenous glucose tolerance tests (IVGTTs) 1 h after the following interventions: 1) the ingestion of 50 g fat to stimulate GLP-I secretion or the ingestion of water as a control and 2) infusion of GLP-I to attain physiological levels or a control infusion of saline. The results of the IVGTTs were analyzed using the minimal model technique to determine the insulin sensitivity index (SI) and indexes of insulin-independent glucose disposition, glucose effectiveness at basal insulin (SG), and glucose effectiveness at zero insulin (GEZI), as well as the glucose disappearance constant (k(g)) and the acute insulin response to glucose (AIRg). These parameters were compared between conditions of elevated circulating GLP-I and control conditions. After ingestion of fat and infusion of synthetic hormone, plasma GLP-I increased to similar levels; GLP-I did not change with water ingestion or saline infusion.(ABSTRACT TRUNCATED AT 250 WORDS)

Full Text

Duke Authors

Cited Authors

  • D'Alessio, DA; Prigeon, RL; Ensinck, JW

Published Date

  • December 1995

Published In

Volume / Issue

  • 44 / 12

Start / End Page

  • 1433 - 1437

PubMed ID

  • 7589851

Pubmed Central ID

  • 7589851

Electronic International Standard Serial Number (EISSN)

  • 1939-327X

International Standard Serial Number (ISSN)

  • 0012-1797

Digital Object Identifier (DOI)

  • 10.2337/diab.44.12.1433

Language

  • eng