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Updated: Mar 19, 2026

Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine
Published on: February 26, 2019
Intra-islet glucagon-like peptide 1.
Genevieve E Fava1, Emily W Dong1, Hongju Wu1
1Endocrinology Section, Department of Medicine, Tulane University Health Science Center, New Orleans, LA, United States.
Glucagon-like peptide-1 (GLP-1) is produced in pancreatic alpha cells, acting as a functional incretin. Intra-islet GLP-1 influences insulin and glucagon secretion locally, impacting normal and diabetic conditions.
Area of Science:
- Endocrinology
- Cell Biology
- Metabolic Research
Background:
- Glucagon-like peptide-1 (GLP-1) is recognized as a gut incretin hormone stimulating pancreatic insulin secretion.
- Emerging evidence indicates local production of GLP-1 within pancreatic islets.
Purpose of the Study:
- To review past and current findings on intra-islet GLP-1 production.
- To explore the functions of locally produced GLP-1 within pancreatic islets.
Main Methods:
- Review of existing literature and recent studies.
- Analysis of technological advancements in detecting intra-islet GLP-1.
- Examination of regulatory factors influencing GLP-1 expression and secretion.
Main Results:
- A historical debate existed regarding GLP-1 production in pancreatic alpha cells.
- Recent studies confirm bioactive GLP-1 is produced locally in the pancreas.
- Intra-islet GLP-1 expression and secretion are modulated by cytokines, hyperglycemia, and beta cell injury.
Conclusions:
- GLP-1 is produced by pancreatic alpha cells and functions as an incretin.
- Intra-islet GLP-1 exerts local paracrine/autocrine effects on insulin and glucagon.
- These local actions are relevant in both normal metabolic states and diabetes.
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