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Hong Lan, Galya Vassileva, Aaron Corona, Li Liu, Hana Baker, Andrei Golovko, Susan J Abbondanzo, Weiwen Hu, Shijun Yang, Yun Ning, Robert A Del Vecchio, Frederique Poulet, Maureen Laverty, Eric L Gustafson, Joseph A Hedrick, and Timothy J Kowalski

fall into two major categories: drugs that improve insulin sensitivity, and those that increase insulin secretion from β-cells. Agents that enhance insulin secretion in a glucose-dependent manner, such as glucagon-like peptide-1 (GLP-1) mimetics (e

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A L Pierce, J T Dickey, L Felli, P Swanson, and W W Dickhoff

hormones may modulate the effect of Gh on liver Igf2 production in fishes. To test this hypothesis, we examined basal and Gh-dependent effects of insulin, glucagon, dexamethasone (Dex), and triiodothyronine (T 3 ) on igf2 gene expression in primary

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B D Green, N Irwin, V A Gault, C J Bailey, F P M O’Harte, and P R Flatt

Introduction The incretin hormone glucagon-like peptide-1 (GLP-1) has potent insulinotropic effects on pancreatic β-cells, and further promotes glucose lowering by enhancing glucose uptake and glyconeogenesis in peripheral tissues

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Patricia Vázquez, Isabel Roncero, Enrique Blázquez, and Elvira Alvarez

Introduction Glucagon-like peptide-1(7–36)amide (GLP-1) is an intestinal peptide synthesised in L-cells. It is also produced in the brain ( Jin et al. 1988 , Kreymann et al. 1989 ), where it exerts some effects on

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G Üçkaya, P Delagrange, A Chavanieu, G Grassy, M-F Berthault, A Ktorza, E Cerasi, G Leibowitz, and N Kaiser

that aim to improve β-cell function and survival. Glucagon-like peptide 1 (GLP-1) is a potent incretin hormone secreted by the intestinal L cells in response to food intake ( Drucker 2001 ). GLP-1 exerts multiple effects on pancreatic β

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Patricia Vázquez, Isabel Roncero, Enrique Blázquez, and Elvira Alvarez

facilitate the action of these proteins involved in the signalling process ( Pawson & Scott 1997 ). The glucagon-like peptide-1 (GLP-1) receptor is a member of the G-protein-coupled receptor subfamily ( Dillon et al. 1993 , Thorens 1993 , Thorens

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K K Sidhu, R C Fowkes, R H Skelly, and J M Burrin

Introduction Glucagon-like peptide 1 (GLP-1) is a proglucagon-derived peptide hormone that is synthesized and secreted by intestinal L-cells in response to the ingestion of nutrients and circulates to the pancreas where it stimulates

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Colin W Hay, Elaine M Sinclair, Giovanna Bermano, Elaine Durward, Mohammad Tadayyon, and Kevin Docherty

Introduction Glucagon-like peptide-1 (GLP-1) is a peptide hormone secreted by the enteroendocrine L-cells of the small intestine in response to food intake ( Kieffer & Habener 1999 , Drucker 2001 ). GLP-1 plays an important role in

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M Wimmer, C Tag, D Schreiner, and HW Hofer

High concentrations of protein tyrosine phosphatase (PTP) were found with secretory vesicles of glucagon-producing INR1G9 cells by electron microscopic immunocytochemistry, using a polyclonal antiserum specific for the PTP1B/T-cell (TC)PTP subfamily of PTP. Since TCPTP protein and mRNA were below the detection limit in the cells but significant amounts of PTP1B and mRNA were recognised by a specific monoclonal antibody and a mRNA probe we conclude, that the PTP associated with the vesicles is PTP1B. Only reverse transcriptase (RT)-PCR with primers specific for PTP1B yielded a product of the expected nucleotide sequence. Thus, we conclude that the PTP associated with the vesicles is PTP1B. The presence of vanadate for 48 h attenuated PTP1B expression and caused reduction of steady-state levels of the phosphatase. These conditions also led to a continuing increase in the steady-state rate of glucagon release by the cells. This rate and tyrosine phosphatase levels showed an inverse relationship, suggesting a suppressive role of PTP1B on the regulated secretion of glucagon by INR1G9 cells.

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Raylene A Reimer

Introduction Glucagon-like peptide-1 (GLP-1) is a gut hormone released from intestinal L-cells in response to food ingestion ( Kieffer & Habener 1999 ). In addition to potentiating glucose-dependent insulin secretion, GLP-1