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Department of Medicine, Toronto General Hospital, Banting and Best Diabetes Centre, University of Toronto, Toronto, Ontario M5G 2C4 Canada
Address all correspondence and requests for reprints to: Dr. D. J. Drucker, Toronto General Hospital, 200 Elizabeth Street CCRW3845, Toronto Canada M5G 2C4. E-mail: d.drucker{at}utoronto.ca
The glucagon-like peptides GLP-1 and GLP-2 are produced in enteroendocrine L cells of the small and large intestine and secreted in a nutrient-dependent manner. GLP-1 regulates nutrient assimilation via inhibition of gastric emptying and food intake. GLP-1 controls blood glucose following nutrient absorption via stimulation of glucose-dependent insulin secretion, insulin biosynthesis, islet proliferation, and neogenesis and inhibition of glucagon secretion. Experiments using GLP-1 antagonists and GLP-1 receptor-/- mice indicate that the glucoregulatory actions of GLP-1 are essential for glucose homeostasis. In the central nervous system, GLP-1 regulates hypothalamic-pituitary function and GLP-1-activated circuits mediate the CNS response to aversive stimulation. GLP-2 maintains the integrity of the intestinal mucosal epithelium via effects on gastric motility and nutrient absorption, crypt cell proliferation and apoptosis, and intestinal permeability. Both GLP-1 and GLP-2 are rapidly inactivated in the circulation as a consequence of amino-terminal cleavage by the enzyme dipeptidyl peptidase IV (DP IV). The actions of these peptides on nutrient absorption and energy homeostasis and the efficacy of GLP-1 and GLP-2 in animal models of diabetes and intestinal diseases, respectively, suggest that analogs of these peptides may be clinically useful for the treatment of human disease.
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B. Yusta, J. Estall, and D. J. Drucker Glucagon-like Peptide-2 Receptor Activation Engages Bad and Glycogen Synthase Kinase-3 in a Protein Kinase A-dependent Manner and Prevents Apoptosis following Inhibition of Phosphatidylinositol 3-Kinase J. Biol. Chem., July 5, 2002; 277(28): 24896 - 24906. [Abstract] [Full Text] [PDF] |
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C. Tourrel, D. Bailbe, M. Lacorne, M.-J. Meile, M. Kergoat, and B. Portha Persistent Improvement of Type 2 Diabetes in the Goto-Kakizaki Rat Model by Expansion of the {beta}-Cell Mass During the Prediabetic Period With Glucagon-Like Peptide-1 or Exendin-4 Diabetes, May 1, 2002; 51(5): 1443 - 1452. [Abstract] [Full Text] [PDF] |
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M. Tsutsumi, T. H. Claus, Y. Liang, Y. Li, L. Yang, J. Zhu, F. Dela Cruz, X. Peng, H. Chen, S. L. Yung, et al. A Potent and Highly Selective VPAC2 Agonist Enhances Glucose-Induced Insulin Release and Glucose Disposal: A Potential Therapy for Type 2 Diabetes Diabetes, May 1, 2002; 51(5): 1453 - 1460. [Abstract] [Full Text] [PDF] |
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D J Drucker Gut adaptation and the glucagon-like peptides Gut, March 1, 2002; 50(3): 428 - 435. [Abstract] [Full Text] [PDF] |
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M.R. Davids, Y. Edoute, S. Stock, and M.L. Halperin Severe degree of hyperglycaemia: insights from integrative physiology QJM, February 1, 2002; 95(2): 113 - 124. [Abstract] [Full Text] [PDF] |
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M. Nian, J. Gu, D. M. Irwin, and D. J. Drucker Human glucagon gene promoter sequences regulating tissue-specific versus nutrient-regulated gene expression Am J Physiol Regulatory Integrative Comp Physiol, January 1, 2002; 282(1): R173 - R183. [Abstract] [Full Text] [PDF] |
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P. A. Halban, S. E. Kahn, A. Lernmark, and C. J. Rhodes Gene and Cell-Replacement Therapy in the Treatment of Type 1 Diabetes: How High Must the Standards Be Set? Diabetes, October 1, 2001; 50(10): 2181 - 2191. [Abstract] [Full Text] |
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J. Lovshin, J. Estall, B. Yusta, T. J. Brown, and D. J. Drucker Glucagon-like Peptide (GLP)-2 Action in the Murine Central Nervous System Is Enhanced by Elimination of GLP-1 Receptor Signaling J. Biol. Chem., June 8, 2001; 276(24): 21489 - 21499. [Abstract] [Full Text] [PDF] |
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