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Novelli M, Masini M, Vecoli C, Moscato S, Funel N, Pippa A, Mattii L, Ippolito C, Campani D, Neglia D, Masiello P. Dysregulated insulin secretion is associated with pancreatic β-cell hyperplasia and direct acinar-β-cell trans-differentiation in partially eNOS-deficient mice. Physiol Rep 2022; 10:e15425. [PMID: 35986504 PMCID: PMC9391603 DOI: 10.14814/phy2.15425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 07/11/2022] [Accepted: 07/23/2022] [Indexed: 06/15/2023] Open
Abstract
eNOS-deficient mice were previously shown to develop hypertension and metabolic alterations associated with insulin resistance either in standard dietary conditions (eNOS-/- homozygotes) or upon high-fat diet (HFD) (eNOS+/- heterozygotes). In the latter heterozygote model, the present study investigated the pancreatic morphological changes underlying the abnormal glycometabolic phenotype. C57BL6 wild type (WT) and eNOS+/- mice were fed with either chow or HFD for 16 weeks. After being longitudinally monitored for their metabolic state after 8 and 16 weeks of diet, mice were euthanized and fragments of pancreas were processed for histological, immuno-histochemical and ultrastructural analyses. HFD-fed WT and eNOS+/- mice developed progressive glucose intolerance and insulin resistance. Differently from WT animals, eNOS+/- mice showed a blunted insulin response to a glucose load, regardless of the diet regimen. Such dysregulation of insulin secretion was associated with pancreatic β-cell hyperplasia, as shown by larger islet fractional area and β-cell mass, and higher number of extra-islet β-cell clusters than in chow-fed WT animals. In addition, only in the pancreas of HFD-fed eNOS+/- mice, there was ultrastructural evidence of a number of hybrid acinar-β-cells, simultaneously containing zymogen and insulin granules, suggesting the occurrence of a direct exocrine-endocrine transdifferentiation process, plausibly triggered by metabolic stress associated to deficient endothelial NO production. As suggested by confocal immunofluorescence analysis of pancreatic histological sections, inhibition of Notch-1 signaling, likely due to a reduced NO availability, is proposed as a novel mechanism that could favor both β-cell hyperplasia and acinar-β-cell transdifferentiation in eNOS-deficient mice with impaired insulin response to a glucose load.
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Affiliation(s)
- Michela Novelli
- Department of Translational Research and New Technologies in Medicine and SurgeryUniversity of PisaPisaItaly
| | - Matilde Masini
- Department of Translational Research and New Technologies in Medicine and SurgeryUniversity of PisaPisaItaly
| | - Cecilia Vecoli
- Institute of Clinical PhysiologyNational Research Council (CNR)PisaItaly
| | - Stefania Moscato
- Department of Clinical and Experimental MedicineUniversity of PisaPisaItaly
- Interdepartmental Research Centre "Nutraceuticals and Food for Health"University of PisaPisaItaly
| | - Niccola Funel
- Department of Translational Research and New Technologies in Medicine and SurgeryUniversity of PisaPisaItaly
| | - Anna Pippa
- Institute of Clinical PhysiologyNational Research Council (CNR)PisaItaly
| | - Letizia Mattii
- Department of Clinical and Experimental MedicineUniversity of PisaPisaItaly
- Interdepartmental Research Centre "Nutraceuticals and Food for Health"University of PisaPisaItaly
| | - Chiara Ippolito
- Department of Clinical and Experimental MedicineUniversity of PisaPisaItaly
| | - Daniela Campani
- Department of Surgical, Medical and Molecular Pathology, and Critical Care MedicineUniversity of PisaPisaItaly
| | - Danilo Neglia
- Cardiovascular DepartmentFondazione Toscana Gabriele Monasterio per la Ricerca Medica e di Sanità PubblicaPisaItaly
| | - Pellegrino Masiello
- Department of Translational Research and New Technologies in Medicine and SurgeryUniversity of PisaPisaItaly
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Linkens AMA, Houben AJ, Niessen PM, Wijckmans N, de Goei E, Van den Eynde MD, Scheijen JLJM, Waarenburg M, Mari A, Berendschot TT, Streese L, Hanssen H, van Dongen MC, van Gool C, Stehouwer CDA, Eussen SJ, Schalkwijk C. A 4-week high-AGE diet does not impair glucose metabolism and vascular function in obese individuals. JCI Insight 2022; 7:156950. [PMID: 35133989 PMCID: PMC8986074 DOI: 10.1172/jci.insight.156950] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 02/04/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Accumulation of advanced glycation endproducts (AGEs) may contribute to the pathophysiology of type 2 diabetes and its vascular complications. AGEs are widely present in food, but whether restricting AGE intake improves risk factors for type 2 diabetes and vascular dysfunction is controversial. METHODS Abdominally obese but otherwise healthy individuals were randomly assigned to a specifically designed 4-week diet low or high in AGEs in a double-blind, parallel design. Insulin sensitivity, secretion, and clearance were assessed by a combined hyperinsulinemic-euglycemic and hyperglycemic clamp. Micro- and macrovascular function, inflammation, and lipid profiles were assessed by state-of-the-art in vivo measurements and biomarkers. Specific urinary and plasma AGEs Nε-(carboxymethyl)lysine (CML), Nε-(1-carboxyethyl)lysine (CEL), and Nδ-(5-hydro-5-methyl-4-imidazolon-2-yl)-ornithine (MG-H1) were assessed by mass spectrometry. RESULTS In 73 individuals (22 males, mean ± SD age and BMI 52 ± 14 years, 30.6 ± 4.0 kg/m2), intake of CML, CEL, and MG-H1 differed 2.7-, 5.3-, and 3.7-fold between the low- and high-AGE diets, leading to corresponding changes of these AGEs in urine and plasma. Despite this, there was no difference in insulin sensitivity, secretion, or clearance; micro- and macrovascular function; overall inflammation; or lipid profile between the low and high dietary AGE groups (for all treatment effects, P > 0.05). CONCLUSION This comprehensive RCT demonstrates very limited biological consequences of a 4-week diet low or high in AGEs in abdominally obese individuals. TRIAL REGISTRATION Clinicaltrials.gov, NCT03866343; trialregister.nl, NTR7594. FUNDING Diabetesfonds and ZonMw.
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Affiliation(s)
- Armand M A Linkens
- Cardiovascular Research Center, Maastricht (CARIM), Maastricht, Netherlands
| | - Alfons J Houben
- Department of Internal Medicine, Maastricht University Medical Center, Maastricht, Netherlands
| | - Petra M Niessen
- Department of Internal Medicine, Cardiovascular Research Institute Maastric, Maastricht University Medical Center, Maastricht, Netherlands
| | - Nicole Wijckmans
- Department of Epidemiology, Maastricht University, Maastricht, the Netherla, CARIM School for Cardiovascular Diseases, Maastricht University, the Netherlands, Maastricht, Netherlands
| | - Erica de Goei
- CARIM School for Cardiovascular Diseases, Maastricht University, the Nether, Department of Epidemiology, Maastricht University, Maastricht, the Netherlands, Maastricht, Netherlands
| | - Mathias Dg Van den Eynde
- Department of Internal Medicine, Maastricht University Medical Center, the , CARIM School for Cardiovascular Diseases, Maastricht University, the Netherlands, Maastricht, Netherlands
| | - Jean L J M Scheijen
- Internal Medicine, Maastricht University Medical Center, Maastricht, Netherlands
| | - Marjo Waarenburg
- Internal Medicine, Maastricht University Medical Center, Maastricht, Netherlands
| | - Andrea Mari
- Institute of Biomedical Engineering, National Research Council, Padova, Italy
| | - Tos Tjm Berendschot
- University Eye Clinic Maastricht, Maastricht University Medical Center, the Netherlands., Maastricht, Netherlands
| | - Lukas Streese
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | - Henner Hanssen
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | - Martien Cjm van Dongen
- Department of Epidemiology, Maastricht University, Maastricht, the Netherlands, Maastricht, Netherlands
| | - Christel van Gool
- Department of Epidemiology, Maastricht University, Maastricht, the Netherlands, Maastricht, Netherlands
| | - Coen DA Stehouwer
- Department of Internal Medicine, Cardiovascular Research Institute Maastric, Maastricht University Medical Center, Maastricht, Netherlands
| | - Simone Jpm Eussen
- Department of Epidemiology, Maastricht University, Maastricht, the Netherlands, Maastricht, Netherlands
| | - Casper Schalkwijk
- Department of Internal Medicine, Cardiovascular Research Institute Maastric, Maastricht University Medical Center, Maastricht, Netherlands
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Ji Z, Luo J, Su T, Chen C, Su Y. miR-7a Targets Insulin Receptor Substrate-2 Gene and Suppresses Viability and Invasion of Cells in Diabetic Retinopathy Mice via PI3K-Akt-VEGF Pathway. Diabetes Metab Syndr Obes 2021; 14:719-728. [PMID: 33623407 PMCID: PMC7896799 DOI: 10.2147/dmso.s288482] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 01/11/2021] [Indexed: 12/11/2022] Open
Abstract
INTRODUCTION Diabetic retinopathy (DR) is one of the major leading causes for vision loss globally. Current study illustrates the role of miR-7a in DR. MATERIAL AND METHODS Retinal pericytes (RPs) and Endothelial cells (ECs) were isolated from mouse model of DR. qRT-PCR was done for expression of miR-7a and target gene mRNA, Western blot for protein expression. Identification of miR-7a target gene was done by TargetScan and Luciferase assay. Cell viability and invasion was done by MTT and Transwell chamber assay. RESULTS The expression of miR-7a was down-regulated whereas level of IRS-2 was unregulated in isolated RPs and ECs. Luciferase assay suggested correlation between miR-7a and IRS-2, over-expression of miR-7a using a mimic resulted in suppression in viability and invasion capacity of RPs and ECs and inhibited the protein levels of PI3K/Akt cascade and IRS-2, and however the inhibitor reversed them respectively. Transfection of siRNA targeting IRS-2 caused alteration in miR-7a mediated changes in ECs suggesting that miR-7a may decrease angiogenesis in DR by inhibiting the levels of IRS-2. CONCLUSION miR-7a suppresses PI3K/Akt cascade via targeting IRS-2, thus decreasing the viability and invasion capacity of RPs and ECs, suggesting an interesting treatment target for DR.
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Affiliation(s)
- Zhenyu Ji
- Department of Ophthalmology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People’s Republic of China
| | - Jinyuan Luo
- Department of Ophthalmology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People’s Republic of China
| | - Ting Su
- Eye Institute of Xiamen University, Xiamen University, Xiamen, Fujian, 361102, People’s Republic of China
| | - Changzheng Chen
- Department of Ophthalmology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People’s Republic of China
| | - Yu Su
- Department of Ophthalmology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People’s Republic of China
- Correspondence: Yu Su Department of Ophthalmology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People’s Republic of ChinaTel/Fax +86-2788041911 Email
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Weitz J, Menegaz D, Caicedo A. Deciphering the Complex Communication Networks That Orchestrate Pancreatic Islet Function. Diabetes 2021; 70:17-26. [PMID: 33355306 PMCID: PMC7881851 DOI: 10.2337/dbi19-0033] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 10/01/2020] [Indexed: 12/27/2022]
Abstract
Pancreatic islets are clusters of hormone-secreting endocrine cells that rely on intricate cell-cell communication mechanisms for proper function. The importance of multicellular cooperation in islet cell physiology was first noted nearly 30 years ago in seminal studies showing that hormone secretion from endocrine cell types is diminished when these cells are dispersed. These studies showed that reestablishing cellular contacts in so-called pseudoislets caused endocrine cells to regain hormone secretory function. This not only demonstrated that cooperation between islet cells is highly synergistic but also gave birth to the field of pancreatic islet organoids. Here we review recent advances related to the mechanisms of islet cell cross talk. We first describe new developments that revise current notions about purinergic and GABA signaling in islets. Then we comment on novel multicellular imaging studies that are revealing emergent properties of islet communication networks. We finish by highlighting and discussing recent synthetic approaches that use islet organoids of varied cellular composition to interrogate intraislet signaling mechanisms. This reverse engineering of islets not only will shed light on the mechanisms of intraislet signaling and define communication networks but also may guide efforts aimed at restoring islet function and β-cell mass in diabetes.
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Affiliation(s)
- Jonathan Weitz
- Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL
- Diabetes Research Institute, University of Miami Leonard M. Miller School of Medicine, Miami, FL
| | - Danusa Menegaz
- Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL
| | - Alejandro Caicedo
- Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL
- Diabetes Research Institute, University of Miami Leonard M. Miller School of Medicine, Miami, FL
- Department of Physiology and Biophysics, University of Miami Leonard M. Miller School of Medicine, Miami, FL
- Program in Neuroscience, University of Miami Leonard M. Miller School of Medicine, Miami, FL
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Climie RE, van Sloten TT, Bruno RM, Taddei S, Empana JP, Stehouwer CD, Sharman JE, Boutouyrie P, Laurent S. Macrovasculature and Microvasculature at the Crossroads Between Type 2 Diabetes Mellitus and Hypertension. Hypertension 2019; 73:1138-1149. [DOI: 10.1161/hypertensionaha.118.11769] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Rachel E. Climie
- From the INSERM, U970, Paris Cardiovascular Research Center (PARCC), France (R.E.C., T.T.v.S., R.-M.B., J.-P.E.)
- Baker Heart and Diabetes Institute, Melbourne, Australia (R.E.C.)
- Menzies Institute for Medical Research, University of Tasmanian, Hobart, Australia (R.E.C., J.E.S.)
| | - Thomas T. van Sloten
- From the INSERM, U970, Paris Cardiovascular Research Center (PARCC), France (R.E.C., T.T.v.S., R.-M.B., J.-P.E.)
- Department of Internal Medicine, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, the Netherlands (T.T.v.S., C.D.A.S.)
| | - Rosa-Maria Bruno
- From the INSERM, U970, Paris Cardiovascular Research Center (PARCC), France (R.E.C., T.T.v.S., R.-M.B., J.-P.E.)
- Department of Clinical and Experimental Medicine, University of Pisa, Italy (R.-M.B., S.T.)
| | - Stefano Taddei
- Department of Clinical and Experimental Medicine, University of Pisa, Italy (R.-M.B., S.T.)
| | - Jean-Philippe Empana
- From the INSERM, U970, Paris Cardiovascular Research Center (PARCC), France (R.E.C., T.T.v.S., R.-M.B., J.-P.E.)
| | - Coen D.A. Stehouwer
- Department of Internal Medicine, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, the Netherlands (T.T.v.S., C.D.A.S.)
| | - James E. Sharman
- Menzies Institute for Medical Research, University of Tasmanian, Hobart, Australia (R.E.C., J.E.S.)
| | - Pierre Boutouyrie
- INSERM, U970, APHP. Paris Descartes University, Paris, France (P.B., S.L.)
| | - Stéphane Laurent
- INSERM, U970, APHP. Paris Descartes University, Paris, France (P.B., S.L.)
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Stehouwer CDA. Microvascular Dysfunction and Hyperglycemia: A Vicious Cycle With Widespread Consequences. Diabetes 2018; 67:1729-1741. [PMID: 30135134 DOI: 10.2337/dbi17-0044] [Citation(s) in RCA: 176] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 06/18/2018] [Indexed: 11/13/2022]
Abstract
Microvascular and metabolic physiology are tightly linked. This Perspective reviews evidence that 1) the relationship between hyperglycemia and microvascular dysfunction (MVD) is bidirectional and constitutes a vicious cycle; 2) MVD in diabetes affects many, if not all, organs, which may play a role in diabetes-associated comorbidities such as depression and cognitive impairment; and 3) MVD precedes, and contributes to, hyperglycemia in type 2 diabetes (T2D) through impairment of insulin-mediated glucose disposal and, possibly, insulin secretion. Obesity and adverse early-life exposures are important drivers of MVD. MVD can be improved through weight loss (in obesity) and through exercise. Pharmacological interventions to improve MVD are an active area of investigation.
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Affiliation(s)
- Coen D A Stehouwer
- Department of Internal Medicine and CARIM School for Cardiovascular Diseases, Maastricht University Medical Centre+, Maastricht, the Netherlands
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Fang S, Ma X, Guo S, Lu J. MicroRNA-126 inhibits cell viability and invasion in a diabetic retinopathy model via targeting IRS-1. Oncol Lett 2017; 14:4311-4318. [PMID: 28943945 DOI: 10.3892/ol.2017.6695] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 03/28/2017] [Indexed: 12/28/2022] Open
Abstract
Diabetic retinopathy (DR) is a sight-threatening complication of diabetes. IRS-1 was predicted to be the target gene of microRNA-126 (miR-126). The present study was designed to illustrate the involvement of miR-126 in the regulation of DR via targeting IRS-1. The present study revealed that the expression of miR-126 was significantly decreased while IRS-1 expression was increased in endothelial cells (ECs) and retinal pericytes (RPs) from a DR mouse model compared with healthy controls. Furthermore, a luciferase reporter assay confirmed the interaction between miR-126 and IRS-1. Following transfection with anmiR-126 mimic or miR-126 inhibitor, overexpression of miR-126 was demonstrated to suppress the invasion and viability of ECs and RPs and to inhibit the IRS-1 and phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt) pathway protein expression levels, with inhibition of miR-126 leading to reverse results. Furthermore, transfection with small interfering RNA targeting IRS-1 altered the miR-126-induced effects observed in ECs, indicating that miR-126 may suppress angiogenesis in DR via inhibition of IRS-1 expression. Taken together, the results of the present study suggested that miR-126 affected the expression of IRS-1, resulting in downregulated expression of PI3K/Akt pathway proteins, and also suppressed cell invasion and viability. These results may provide a potential therapeutic strategy for DR.
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Affiliation(s)
- Shifeng Fang
- Dalian Medical University, Dalian, Liaoning 116044, P.R. China
| | - Xiang Ma
- Dalian Medical University, Dalian, Liaoning 116044, P.R. China.,Department of Ophthalmology, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Suping Guo
- Department of Ophthalmology, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Jianmin Lu
- Department of Ophthalmology, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
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Koffert J, Honka H, Teuho J, Kauhanen S, Hurme S, Parkkola R, Oikonen V, Mari A, Lindqvist A, Wierup N, Groop L, Nuutila P. Effects of meal and incretins in the regulation of splanchnic blood flow. Endocr Connect 2017; 6:179-187. [PMID: 28258126 PMCID: PMC5428912 DOI: 10.1530/ec-17-0015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 03/03/2017] [Indexed: 01/19/2023]
Abstract
OBJECTIVE Meal ingestion is followed by a redistribution of blood flow (BF) within the splanchnic region contributing to nutrient absorption, insulin secretion and glucose disposal, but factors regulating this phenomenon in humans are poorly known. The aim of the present study was to evaluate the organ-specific changes in BF during a mixed-meal and incretin infusions. DESIGN A non-randomized intervention study of 10 healthy adults to study splanchnic BF regulation was performed. METHODS Effects of glucose-dependent insulinotrophic polypeptide (GIP) and glucagon-like peptide 1 (GLP-1) infusions and mixed-meal were tested in 10 healthy, glucose tolerant subjects using PET-MRI multimodal imaging technology. Intestinal and pancreatic BF and blood volume (BV) were measured with 15O-water and 15O-carbon monoxide, respectively. RESULTS Ingestion of a mixed-meal led to an increase in pancreatic and jejunal BF, whereas duodenal BF was unchanged. Infusion of GIP and GLP-1 reduced BF in the pancreas. However, GIP infusion doubled blood flow in the jejunum with no effect of GLP-1. CONCLUSION Together, our data suggest that meal ingestion leads to increases in pancreatic BF accompanied by a GIP-mediated increase in jejunal but not duodenal blood flow.
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Affiliation(s)
- Jukka Koffert
- Department of GastroenterologyTurunmaa Hospital, Turku, Finland
- Turku PET CentreUniversity of Turku, Turku, Finland
| | - Henri Honka
- Turku PET CentreUniversity of Turku, Turku, Finland
| | - Jarmo Teuho
- Department of GastroenterologyTurunmaa Hospital, Turku, Finland
| | - Saila Kauhanen
- Division of Digestive Surgery and UrologyTurku University Hospital, Turku, Finland
| | - Saija Hurme
- Institute of BiostatisticsUniversity of Turku, Turku, Finland
| | - Riitta Parkkola
- Turku PET CentreUniversity of Turku, Turku, Finland
- Department of RadiologyUniversity of Turku and Turku University Hospital, Turku, Finland
| | - Vesa Oikonen
- Turku PET CentreUniversity of Turku, Turku, Finland
| | - Andrea Mari
- Institute of NeuroscienceNational Research Council, Padua, Italy
| | - Andreas Lindqvist
- Department of Clinical SciencesLund University Diabetes Centre, Malmö, Sweden
| | - Nils Wierup
- Department of Clinical SciencesLund University Diabetes Centre, Malmö, Sweden
| | - Leif Groop
- Department of Clinical SciencesLund University Diabetes Centre, Malmö, Sweden
| | - Pirjo Nuutila
- Turku PET CentreUniversity of Turku, Turku, Finland
- Department of EndocrinologyTurku University Hospital, Turku, Finland
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