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A Edlund Unit of Islet Cell Exocytosis, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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M Barghouth Unit of Islet Pathophysiology, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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M Hühn Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden

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M Abels Unit of Neuroendocrine Cell biology, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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J S E Esguerra Unit of Islet Cell Exocytosis, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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I G Mollet Unit of Islet Cell Exocytosis, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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E Svedin Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden

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A Wendt Unit of Islet Cell Exocytosis, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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E Renström Unit of Islet Pathophysiology, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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E Zhang Unit of Islet Pathophysiology, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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N Wierup Unit of Neuroendocrine Cell biology, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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B J Scholte Department of Cell Biology, Erasmus MC, Rotterdam, the Netherlands
Pediatric Pulmonology, Erasmus MC, Rotterdam, the Netherlands

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M Flodström-Tullberg Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden

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L Eliasson Unit of Islet Cell Exocytosis, Lund University Diabetes Centre, Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden

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F508del beta cells have defective exocytosis and insulin secretion. Finally, we measured islet glucagon and somatostatin secretion. The data presented highlight the important contribution of CFTR in beta cells for functional insulin secretion

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Glyn M Noguchi Department of Neurobiology, Physiology & Behavior, University of California Davis, Davis, California, USA

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Vincent C Castillo Department of Neurobiology, Physiology & Behavior, University of California Davis, Davis, California, USA

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Cynthia J Donaldson Salk Institute for Biological Studies, La Jolla, California, USA

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Marcus R Flisher Department of Neurobiology, Physiology & Behavior, University of California Davis, Davis, California, USA

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Ariana T Momen Department of Neurobiology, Physiology & Behavior, University of California Davis, Davis, California, USA

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Alan Saghatelian Salk Institute for Biological Studies, La Jolla, California, USA

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Mark O Huising Department of Neurobiology, Physiology & Behavior, University of California Davis, Davis, California, USA
Department of Physiology & Membrane Biology, University of California Davis, Davis, California, USA

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Introduction The alpha cells of the pancreatic islets of Langerhans are important physiological regulators of blood glucose that act to raise blood glucose levels via the actions of their principal hormone, glucagon. Despite being

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Elliott P Brooks Barbara Davis Center for Diabetes, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado, USA

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Lori Sussel Barbara Davis Center for Diabetes, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado, USA

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Introduction α cells are one of four major endocrine cell types that reside in adult pancreatic endocrine clusters called the Islets of Langerhans. The islet α cells secrete the hormone glucagon in response to hypoglycemic conditions to

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Sarah L Armour Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Denmark

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Jade E Stanley Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA

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James Cantley Division of Cellular and Systems Medicine, School of Medicine, University of Dundee, UK

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E Danielle Dean Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
Division of Diabetes, Endocrinology, & Metabolism, Vanderbilt University Medical Center School of Medicine, Nashville, Tennessee, USA

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Jakob G Knudsen Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Denmark

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Introduction Glucagon is secreted from alpha cells located in pancreatic islets of Langerhans and is an important counter-regulatory hormone to insulin, acting to increase blood glucose. Indeed, it was this physiological hyperglycaemic effect

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Paul Millar SAAD Centre for Pharmacy and Diabetes, School of Biomedical Sciences, University of Ulster, Northern Ireland, UK

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Nupur Pathak SAAD Centre for Pharmacy and Diabetes, School of Biomedical Sciences, University of Ulster, Northern Ireland, UK

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Vadivel Parthsarathy SAAD Centre for Pharmacy and Diabetes, School of Biomedical Sciences, University of Ulster, Northern Ireland, UK

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Anthony J Bjourson Northern Ireland Centre for Stratified Medicine, University of Ulster, C-TRIC Building, Altnagelvin Hospital, Northern Ireland, UK

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Maurice O’Kane Northern Ireland Centre for Stratified Medicine, University of Ulster, C-TRIC Building, Altnagelvin Hospital, Northern Ireland, UK
Clinical Chemistry Laboratory, Western Health and Social Care Trust, Altnagelvin Hospital, Northern Ireland, UK

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Varun Pathak SAAD Centre for Pharmacy and Diabetes, School of Biomedical Sciences, University of Ulster, Northern Ireland, UK

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R Charlotte Moffett SAAD Centre for Pharmacy and Diabetes, School of Biomedical Sciences, University of Ulster, Northern Ireland, UK

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Peter R Flatt SAAD Centre for Pharmacy and Diabetes, School of Biomedical Sciences, University of Ulster, Northern Ireland, UK

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Victor A Gault SAAD Centre for Pharmacy and Diabetes, School of Biomedical Sciences, University of Ulster, Northern Ireland, UK

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surge in the number of new drug classes such as glucagon-like peptide-1 (GLP-1) agonists, dipeptidylpeptidase-4 (DPP4) inhibitors and sodium glucose cotransporter-2 (SGLT2) inhibitors ( Bailey et al . 2016 ). Although these agents may be used as

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Rebecca McGirr Metabolism and Diabetes and Imaging Programs, Departments of Medical Biophysics, Pathology, Medicine, Lawson Health Research Institute, 268 Grosvenor Street, London, Ontario, Canada N6A 4V2

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Leonardo Guizzetti Metabolism and Diabetes and Imaging Programs, Departments of Medical Biophysics, Pathology, Medicine, Lawson Health Research Institute, 268 Grosvenor Street, London, Ontario, Canada N6A 4V2

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Savita Dhanvantari Metabolism and Diabetes and Imaging Programs, Departments of Medical Biophysics, Pathology, Medicine, Lawson Health Research Institute, 268 Grosvenor Street, London, Ontario, Canada N6A 4V2
Metabolism and Diabetes and Imaging Programs, Departments of Medical Biophysics, Pathology, Medicine, Lawson Health Research Institute, 268 Grosvenor Street, London, Ontario, Canada N6A 4V2
Metabolism and Diabetes and Imaging Programs, Departments of Medical Biophysics, Pathology, Medicine, Lawson Health Research Institute, 268 Grosvenor Street, London, Ontario, Canada N6A 4V2
Metabolism and Diabetes and Imaging Programs, Departments of Medical Biophysics, Pathology, Medicine, Lawson Health Research Institute, 268 Grosvenor Street, London, Ontario, Canada N6A 4V2

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Introduction Proglucagon is a prohormone that is expressed in the alpha cells of the pancreas, the L cells of the intestine and in select neurons of the brainstem. In the pancreatic alpha cell, PC2 cleaves proglucagon to yield glucagon ( Rouille et

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Maaike M Roefs Department of Internal Medicine, Leiden University Medical Center (LUMC), Leiden, the Netherlands

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Françoise Carlotti Department of Internal Medicine, Leiden University Medical Center (LUMC), Leiden, the Netherlands

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Katherine Jones Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Oxford, UK

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Hannah Wills Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Oxford, UK

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Alexander Hamilton Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Oxford, UK

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Michael Verschoor Department of Internal Medicine, Leiden University Medical Center (LUMC), Leiden, the Netherlands

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Joanna M Williams Durkin Department of Internal Medicine, Leiden University Medical Center (LUMC), Leiden, the Netherlands

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Laura Garcia-Perez Department of Internal Medicine, Leiden University Medical Center (LUMC), Leiden, the Netherlands

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Melissa F Brereton Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK

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Laura McCulloch Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Oxford, UK

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Marten A Engelse Department of Internal Medicine, Leiden University Medical Center (LUMC), Leiden, the Netherlands

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Paul R V Johnson Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Oxford, UK
Nuffield Department of Surgical Sciences, John Radcliffe Hospital, Oxford, UK

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Barbara C Hansen Departments of Internal Medicine and Pediatrics, Morsani College of Medicine, University of South Florida, Tampa, Florida, USA

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Kevin Docherty Medical Sciences, University of Aberdeen, Aberdeen, UK

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Eelco J P de Koning Department of Internal Medicine, Leiden University Medical Center (LUMC), Leiden, the Netherlands
Hubrecht Institute, Utrecht, the Netherlands

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Anne Clark Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Oxford, UK

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not identical methodologies. Tissue sections were rehydrated, and antigen retrieval was performed by heating slides in 0.01 M citrate buffer (pH = 6.0). Primary antibodies against insulin, glucagon, vimentin, Nkx6.1, Pdx1, N-cadherin, smooth muscle

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Affiong Ika Oqua Section of Cell Biology and Functional Genomics, Division of Diabetes, Endocrinology and Metabolism, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, UK

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Yusman Manchanda Section of Cell Biology and Functional Genomics, Division of Diabetes, Endocrinology and Metabolism, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, UK

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Emma Rose McGlone Department of Surgery and Cancer, Imperial College London, London, UK

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Ben Jones Section of Investigative Medicine, Division of Diabetes, Endocrinology and Metabolism, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, UK

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Sarah Rouse Department of Life Sciences, Imperial College, London, UK

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Alejandra Tomas Section of Cell Biology and Functional Genomics, Division of Diabetes, Endocrinology and Metabolism, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, UK

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, characterised by Creutzfeldt in 1979, are peptide hormones secreted in the gastrointestinal tract in response to nutrients that potentiate the glucose-dependent secretion of insulin. The primary incretins include glucagon-like peptide 1 (GLP-1), secreted mainly

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Maureen J Charron Departments of Biochemistry, Obstetrics and Gynecology and Women's Health, Medicine, Department of Pediatrics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, F312, Bronx, New York 10461, USA
Departments of Biochemistry, Obstetrics and Gynecology and Women's Health, Medicine, Department of Pediatrics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, F312, Bronx, New York 10461, USA
Departments of Biochemistry, Obstetrics and Gynecology and Women's Health, Medicine, Department of Pediatrics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, F312, Bronx, New York 10461, USA

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Patricia M Vuguin Departments of Biochemistry, Obstetrics and Gynecology and Women's Health, Medicine, Department of Pediatrics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, F312, Bronx, New York 10461, USA

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Introduction Glucagon is a 29-amino acid polypeptide secreted by the α or glucagon cell of the islet of Langerhans in response to hypoglycemia, arginine, gastric inhibitory polypeptide (during ambient reduced glucose levels), gastrin, and potassium

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Thomas H Claus Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Clark Q Pan Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Joanne M Buxton Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Ling Yang Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Jennifer C Reynolds Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Nicole Barucci Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Michael Burns Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Astrid A Ortiz Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Steve Roczniak Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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James N Livingston Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Kevin B Clairmont Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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James P Whelan Bayer HealthCare, Pharmaceuticals, Department of Metabolic Disease Research, 400 Morgan Lane, West Haven, Connecticut 06516 USA
Bayer HealthCare, Biotechnology, 800 Dwight Way, Berkeley, California 94701, USA

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Introduction Glucagon-like peptide-1 (GLP-1) is a potent endogenous modulator of insulin secretion that is released by the L-cells in the crypts of the jejunum and ileum in response to a meal ( Kieffer & Habener 1999 ). Its function

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