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Turpaev K, Krizhanovskii C, Wang X, Sargsyan E, Bergsten P, Welsh N. The protein synthesis inhibitor brusatol normalizes high-fat diet-induced glucose intolerance in male C57BL/6 mice: role of translation factor eIF5A hypusination. FASEB J 2019; 33:3510-3522. [PMID: 30462531 DOI: 10.1096/fj.201801698r] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The naturally occurring quassinoid compound brusatol improves the survival of insulin-producing cells when exposed to the proinflammatory cytokines IL-1β and IFN-γ in vitro. The aim of the present study was to investigate whether brusatol also promotes beneficial effects in mice fed a high-fat diet (HFD), and if so, to study the mechanisms by which brusatol acts. In vivo, we observed that the impaired glucose tolerance of HFD-fed male C57BL/6 mice was counteracted by a 2 wk treatment with brusatol. Brusatol treatment improved both β-cell function and peripheral insulin sensitivity of HFD-fed mice. In vitro, brusatol inhibited β-cell total protein and proinsulin biosynthesis, with an ED50 of ∼40 nM. In line with this, brusatol blocked cytokine-induced iNOS protein expression via inhibition of iNOS mRNA translation. Brusatol may have affected protein synthesis, at least in part, via inhibition of eukaryotic initiation factor 5A (eIF5A) hypusination, as eIF5A spermidine association and hypusination in RIN-5AH cells was reduced in a dose- and time-dependent manner. The eIF5A hypusination inhibitor GC7 promoted a similar effect. Both brusatol and GC7 protected rat RIN-5AH cells against cytokine-induced cell death. Brusatol reduced eIF5A hypusination and cytokine-induced cell death in EndoC-βH1 cells as well. Finally, hypusinated eIF5A was reduced in vivo by brusatol in islet endocrine and endothelial islet cells of mice fed an HFD. The results of the present study suggest that brusatol improves glucose intolerance in mice fed an HFD, possibly by inhibiting protein biosynthesis and eIF5A hypusination.-Turpaev, K., Krizhanovskii, C., Wang, X., Sargsyan, E., Bergsten, P., Welsh, N. The protein synthesis inhibitor brusatol normalizes high-fat diet-induced glucose intolerance in male C57BL/6 mice: role of translation factor eIF5A hypusination.
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Affiliation(s)
- Kyril Turpaev
- Science for Life Laboratory, Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden; and
- Center for Theoretical Problems of Physicochemical Pharmacology, Russian Academy of Sciences, Moscow, Russia
| | - Camilla Krizhanovskii
- Science for Life Laboratory, Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden; and
| | - Xuan Wang
- Science for Life Laboratory, Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden; and
| | - Ernest Sargsyan
- Science for Life Laboratory, Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden; and
| | - Peter Bergsten
- Science for Life Laboratory, Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden; and
| | - Nils Welsh
- Science for Life Laboratory, Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden; and
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Amior L, Srivastava R, Nano R, Bertuzzi F, Melloul D. The role of Cox-2 and prostaglandin E 2 receptor EP3 in pancreatic β-cell death. FASEB J 2019; 33:4975-4986. [PMID: 30629897 DOI: 10.1096/fj.201801823r] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Elevated levels of lipids, in particular saturated fatty acids, are known to be associated with type 2 diabetes (T2D) and to have a negative effect on β-cell function and survival. We bring new evidence indicating that palmitate up-regulates cyclooxygenase-2 (COX-2) expression levels in human islets and in MIN6 β cells, and that it is elevated in islets isolated from T2D donors. Both small interfering specific cyclooxygenase-2 small interfering RNA (siRNA) or the COX-2 inhibitor celecoxib significantly inhibited apoptosis induced by palmitate. Prostaglandin E2 (PGE2), the predominant product of COX-2 enzymatic activity, activates membrane receptors, which are members of the GPCR-family (EP1-EP4). In the present study, elevated expression of the PGE2 receptor subtype 3 (EP3) receptor was observed in β cells exposed to palmitate and in islets from individuals with T2D. Down-regulation of the pathway using EP3 siRNA or the specific L-798,106 antagonist markedly decreased the levels of palmitate-induced apoptosis. Altogether, our data put forward the COX-2-PGE2-EP3 pathway as one of the mediators of palmitate-induced apoptosis in β-cells.-Amior, L., Srivastava, R., Nano, R., Bertuzzi, F., Melloul, D. The role of Cox-2 and prostaglandin E2 receptor EP3 in pancreatic β-cell death.
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Affiliation(s)
- Livnat Amior
- Department of Endocrinology, Hadassah University Hospital, Jerusalem, Israel; and
| | - Rohit Srivastava
- Department of Endocrinology, Hadassah University Hospital, Jerusalem, Israel; and
| | - Rita Nano
- Diabetes Research Institute, Instituto di Ricovero e Cura a Carattere Scientifico San Raffaele Scientific Institute, Milan, Italy
| | - Federico Bertuzzi
- Diabetes Research Institute, Instituto di Ricovero e Cura a Carattere Scientifico San Raffaele Scientific Institute, Milan, Italy
| | - Danielle Melloul
- Department of Endocrinology, Hadassah University Hospital, Jerusalem, Israel; and
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Saleh A, Anwar MM, Zayed AE, Ezz Eldeen MES, Afifi G, Alnashiri HM, Gomaa AMS, Abd-Elkareem M, Abou-Elhamd AS, Shaheen ES, Mohamed GA, Hetta HF, Kotb AM. Impact of Ginkgo biloba extract and magnetized water on the survival rate and functional capabilities of pancreatic β-cells in type 2 diabetic rat model. Diabetes Metab Syndr Obes 2019; 12:1339-1347. [PMID: 31496771 PMCID: PMC6689767 DOI: 10.2147/dmso.s209856] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Accepted: 07/16/2019] [Indexed: 12/15/2022] Open
Abstract
INTRODUCTION Type 2 diabetes (T2D) is a widely distributed disease that affects large population worldwide. This study aimed to verify the role of Ginkgo biloba (GB) extract and magnetized water (MW) on the survival rate and functional capabilities of pancreatic β-cells in type 2 diabetic rats. MATERIALS AND METHODS T2D was induced by feeding the rats on a high-fat diet (20% fat, 45% carbohydrate, 22% protein) for eight weeks followed by intra-peritoneal injection of a single low dose of streptozotocin (25mg/Kg). Forty rats were randomly assigned to four groups (n=10 rats) as follows: non treated control and three diabetic groups. One diabetic group served as a positive control (diabetic), while the other two groups were orally administered with water extract of GB leaves (0.11 g/kg/day) and MW (600 gauss) for four weeks, respectively. RESULTS The β-cell mass and insulin expression in these cells increased markedly after both treatments, particularly in GB treated group. In addition, the immune-expression of the two antioxidant enzymes; glutathione and superoxide dismutase 2 (SOD2) in the pancreatic tissue demonstrated a down-regulation in GB and MW treated groups as compared with the diabetic group. CONCLUSION A four-week treatment of GB and MW protected pancreatic β-cell cells and improved their insulin expression and antioxidant status in type 2 diabetic rats.
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Affiliation(s)
- Ahmed Saleh
- Department of Physics, Faculty of Science, Jazan University, Jazan, KSA
- Exploratory Center of Science and Technology
, Cairo, Egypt
| | - Mamdouh M Anwar
- Department of Pharmacology, Faculty of Pharmacy, Jazan University, Jazan, KSA
- Medical Physiology Department, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Ahmed E Zayed
- Department of Biology, Faculty of Science, Jazan University, Jazan, KSA
- Department of Anatomy and Histology, Faculty of Veterinary Medicine, Assiut University, Egypt
| | - Manal El Sayed Ezz Eldeen
- Endocrine Unit, Department of Internal Medicine, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Gamal Afifi
- Department of Physics, Faculty of Science, Jazan University, Jazan, KSA
- National Institute for Laser Enhanced Sciences, Cairo University
, Giza, Egypt
| | | | - Asmaa MS Gomaa
- Medical Physiology Department, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Mahmoud Abd-Elkareem
- Department of Anatomy and Histology, Faculty of Veterinary Medicine, Assiut University, Egypt
| | - Alaa Sayed Abou-Elhamd
- Department of Anatomy and Histology, Faculty of Veterinary Medicine, Assiut University, Egypt
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia
| | | | - Ghada A Mohamed
- Endocrine Unit, Department of Internal Medicine, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Helal F Hetta
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Assiut University, Assiut, Egypt
- Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, OH, USA
- Correspondence: Helal F HettaDepartment of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, 231 Albert B. Sabin Way, PO Box 670595, OH45267-0595, USAEmail
| | - Ahmed M Kotb
- Department of Anatomy and Histology, Faculty of Veterinary Medicine, Assiut University, Egypt
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Cha SH, Han EJ, Ahn G, Jun HS. Taurine-Rich-Containing Hot Water Extract of Loliolus Beka Gray Meat Scavenges Palmitate-Induced Free Radicals and Protects Against DNA Damage in Insulin Secreting β-Cells. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1155:483-495. [PMID: 31468425 DOI: 10.1007/978-981-13-8023-5_45] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The loss of pancreatic β-cells plays a central role in the pathogenesis of both type 1 and type 2 diabetes, and many studies have been focused on ways to improve glucose homeostasis by preserving, expanding and improving the function of β-cell. Elevated levels of free fatty acids such as palmitate might contribute to the loss of β-cells. A marine squid, Loliolus beka has long been used as a food in Korea, China, Japan and Europe due to its tender meat and high taurine content. Here, we investigated the protective effects of a hot water extract of Loliolus beka meat (LBM) against palmitate toxicity in Ins-1 cells, a rat β-cell line. Treatment with LBM extract protected against palmitate-induced cytotoxicity and scavenged overproduction of nitric oxide, alkyl, and hydroxyl radicals. In addition, LBM extract protected against palmitate-induced DNA damage and β-cell dysfunction. These findings suggest that LBM protects pancreatic β-cells from palmitate-induced damage. LBM could be a potential therapeutic functional food for diabetes.
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Affiliation(s)
- Seon-Heui Cha
- Department of Marine Bioindustry, Hanseo University, Seosan, Chungcheongman-do, Republic of Korea
| | - Eui Jeong Han
- Department of Food Technology and Nutrition, Department of Marine Bio-Food Sciences, Chonnam National University, Yeosu, Republic of Korea
| | - Ginnae Ahn
- Department of Food Technology and Nutrition, Chonnam National University, Yeosu, Republic of Korea
- Department of Marine Bio-Food Sciences, Chonnam National University, Yeosu, Republic of Korea
| | - Hee-Sook Jun
- Gachon Medical Research Institute, Gil Hospital, Incheon, Republic of Korea.
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105
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Guo P, Wiersch J, Xiao X, Gittes G. Simplified Purification of AAV and Delivery to the Pancreas by Intraductal Administration. Methods Mol Biol 2019; 1950:373-387. [PMID: 30783986 DOI: 10.1007/978-1-4939-9139-6_22] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Genetic manipulation is a very powerful tool for studying diabetes, pancreatitis, and pancreatic cancer. Here we discuss the use of an adeno-associated virus (AAV) vector to modify gene expression, such as to introduce a green fluorescence protein (GFP) in wild-type mice, cre recombinase in loxP mice, or to inactivate a gene with shRNA. The use of viruses for genetic modification allows for time-specific genetic changes which have advantages over time-consuming and often complex cross-breeding strategies. Here we provide a detailed approach for this process from viral production and purification through pancreatic ductal infusion. Our protocol allows efficient delivery of AAV to mediate GFP or cre expression for cell lineage tracing in the mouse pancreas or for the delivery of transgenes under a specific promoter to these cells.
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Affiliation(s)
- Ping Guo
- University of Texas Health Science Center at Houston, Houston, TX, USA.
| | - John Wiersch
- University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Xiangwei Xiao
- University of Pittsburgh/Children's Hospital of Pittsburgh of UPMC, Pittsburgh, PA, USA
| | - George Gittes
- University of Pittsburgh/Children's Hospital of Pittsburgh of UPMC, Pittsburgh, PA, USA
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106
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Pancreas organogenesis: The interplay between surrounding microenvironment(s) and epithelium-intrinsic factors. Curr Top Dev Biol 2019; 132:221-256. [DOI: 10.1016/bs.ctdb.2018.12.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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107
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Hwang Y, Cha SH, Hong Y, Jung AR, Jun HS. Direct differentiation of insulin-producing cells from human urine-derived stem cells. Int J Med Sci 2019; 16:1668-1676. [PMID: 31839754 PMCID: PMC6909801 DOI: 10.7150/ijms.36011] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 10/09/2019] [Indexed: 02/07/2023] Open
Abstract
The loss of pancreatic β-cells is a cause of diabetes. Therefore, replacement of pancreatic β-cells is a logical strategy for the treatment of diabetes, and the generation of insulin-producing cells (IPCs) from stem cells has been widely investigated as an alternative source for pancreatic β-cells. Here, we isolated stem cells from human urine and investigated their differentiation potential into IPCs. We checked the expression of surface stem cell markers and stem cell transcription factors, and found that the isolated human urine-derived stem cells (hUDSCs) expressed the stem cell markers CD44, CD90, CD105 and stage-specific embryonic antigen (SSEA)-4. In addition, these cells expressed octamer binding transcription factor (Oct)4 and vimentin. hUDSCs could differentiate into adipocytes and osteocytes, as evidenced by Oil-red O staining and Alizarin Red S-staining of differentiated cells, respectively. When we directly differentiated hUDSCs into IPCs, the differentiated cells expressed mRNA for pancreatic transcription factors such as neurogenin (Ngn)3 and pancreatic and duodenal homeobox (Pdx)1. Differentiated IPCs expressed insulin and glucagon mRNA and protein, and these IPCs also secreted insulin in response to glucose stimulation. In conclusion, we found that hUDSCs can be directly differentiated into IPCs, which secrete insulin in response to glucose.
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Affiliation(s)
- Yongha Hwang
- College of Pharmacy and Gachon Institute of Pharmaceutical Science, Gachon University, Incheon, 21999, Republic of Korea
| | - Seon-Heui Cha
- Department of Marine Bioindustry, Hanseo University, Chungcheongman-do, 31962, Republic of Korea
| | - Yeonhee Hong
- College of Pharmacy and Gachon Institute of Pharmaceutical Science, Gachon University, Incheon, 21999, Republic of Korea
| | - Ae Ryang Jung
- Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, 21936, Republic of Korea
| | - Hee-Sook Jun
- College of Pharmacy and Gachon Institute of Pharmaceutical Science, Gachon University, Incheon, 21999, Republic of Korea.,Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, 21936, Republic of Korea.,Gachon Medical Research Institute, Gil Hospital, Incheon, 21999, Republic of Korea
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Baeyens L, Lemper M, Staels W, De Groef S, De Leu N, Heremans Y, German MS, Heimberg H. (Re)generating Human Beta Cells: Status, Pitfalls, and Perspectives. Physiol Rev 2018; 98:1143-1167. [PMID: 29717931 DOI: 10.1152/physrev.00034.2016] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Diabetes mellitus results from disturbed glucose homeostasis due to an absolute (type 1) or relative (type 2) deficiency of insulin, a peptide hormone almost exclusively produced by the beta cells of the endocrine pancreas in a tightly regulated manner. Current therapy only delays disease progression through insulin injection and/or oral medications that increase insulin secretion or sensitivity, decrease hepatic glucose production, or promote glucosuria. These drugs have turned diabetes into a chronic disease as they do not solve the underlying beta cell defects or entirely prevent the long-term complications of hyperglycemia. Beta cell replacement through islet transplantation is a more physiological therapeutic alternative but is severely hampered by donor shortage and immune rejection. A curative strategy should combine newer approaches to immunomodulation with beta cell replacement. Success of this approach depends on the development of practical methods for generating beta cells, either in vitro or in situ through beta cell replication or beta cell differentiation. This review provides an overview of human beta cell generation.
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Affiliation(s)
- Luc Baeyens
- Beta Cell Neogenesis (BENE), Vrije Universiteit Brussel, Brussels , Belgium ; Diabetes Center, Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, and Department of Medicine, University of California San Francisco , San Francisco, California ; Genentech Safety Assessment, South San Francisco, California ; Investigative Toxicology, UCB BioPharma, Braine-l'Alleud, Belgium ; Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University, Hospital and Department of Pediatrics and Genetics , Ghent , Belgium ; Department of Endocrinology, Universitair Ziekenhuis Brussel, Brussels , Belgium ; and Department of Endocrinology, Algemeen Stedelijk Ziekenhuis Aalst, Aalst, Belgium
| | - Marie Lemper
- Beta Cell Neogenesis (BENE), Vrije Universiteit Brussel, Brussels , Belgium ; Diabetes Center, Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, and Department of Medicine, University of California San Francisco , San Francisco, California ; Genentech Safety Assessment, South San Francisco, California ; Investigative Toxicology, UCB BioPharma, Braine-l'Alleud, Belgium ; Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University, Hospital and Department of Pediatrics and Genetics , Ghent , Belgium ; Department of Endocrinology, Universitair Ziekenhuis Brussel, Brussels , Belgium ; and Department of Endocrinology, Algemeen Stedelijk Ziekenhuis Aalst, Aalst, Belgium
| | - Willem Staels
- Beta Cell Neogenesis (BENE), Vrije Universiteit Brussel, Brussels , Belgium ; Diabetes Center, Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, and Department of Medicine, University of California San Francisco , San Francisco, California ; Genentech Safety Assessment, South San Francisco, California ; Investigative Toxicology, UCB BioPharma, Braine-l'Alleud, Belgium ; Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University, Hospital and Department of Pediatrics and Genetics , Ghent , Belgium ; Department of Endocrinology, Universitair Ziekenhuis Brussel, Brussels , Belgium ; and Department of Endocrinology, Algemeen Stedelijk Ziekenhuis Aalst, Aalst, Belgium
| | - Sofie De Groef
- Beta Cell Neogenesis (BENE), Vrije Universiteit Brussel, Brussels , Belgium ; Diabetes Center, Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, and Department of Medicine, University of California San Francisco , San Francisco, California ; Genentech Safety Assessment, South San Francisco, California ; Investigative Toxicology, UCB BioPharma, Braine-l'Alleud, Belgium ; Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University, Hospital and Department of Pediatrics and Genetics , Ghent , Belgium ; Department of Endocrinology, Universitair Ziekenhuis Brussel, Brussels , Belgium ; and Department of Endocrinology, Algemeen Stedelijk Ziekenhuis Aalst, Aalst, Belgium
| | - Nico De Leu
- Beta Cell Neogenesis (BENE), Vrije Universiteit Brussel, Brussels , Belgium ; Diabetes Center, Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, and Department of Medicine, University of California San Francisco , San Francisco, California ; Genentech Safety Assessment, South San Francisco, California ; Investigative Toxicology, UCB BioPharma, Braine-l'Alleud, Belgium ; Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University, Hospital and Department of Pediatrics and Genetics , Ghent , Belgium ; Department of Endocrinology, Universitair Ziekenhuis Brussel, Brussels , Belgium ; and Department of Endocrinology, Algemeen Stedelijk Ziekenhuis Aalst, Aalst, Belgium
| | - Yves Heremans
- Beta Cell Neogenesis (BENE), Vrije Universiteit Brussel, Brussels , Belgium ; Diabetes Center, Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, and Department of Medicine, University of California San Francisco , San Francisco, California ; Genentech Safety Assessment, South San Francisco, California ; Investigative Toxicology, UCB BioPharma, Braine-l'Alleud, Belgium ; Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University, Hospital and Department of Pediatrics and Genetics , Ghent , Belgium ; Department of Endocrinology, Universitair Ziekenhuis Brussel, Brussels , Belgium ; and Department of Endocrinology, Algemeen Stedelijk Ziekenhuis Aalst, Aalst, Belgium
| | - Michael S German
- Beta Cell Neogenesis (BENE), Vrije Universiteit Brussel, Brussels , Belgium ; Diabetes Center, Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, and Department of Medicine, University of California San Francisco , San Francisco, California ; Genentech Safety Assessment, South San Francisco, California ; Investigative Toxicology, UCB BioPharma, Braine-l'Alleud, Belgium ; Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University, Hospital and Department of Pediatrics and Genetics , Ghent , Belgium ; Department of Endocrinology, Universitair Ziekenhuis Brussel, Brussels , Belgium ; and Department of Endocrinology, Algemeen Stedelijk Ziekenhuis Aalst, Aalst, Belgium
| | - Harry Heimberg
- Beta Cell Neogenesis (BENE), Vrije Universiteit Brussel, Brussels , Belgium ; Diabetes Center, Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, and Department of Medicine, University of California San Francisco , San Francisco, California ; Genentech Safety Assessment, South San Francisco, California ; Investigative Toxicology, UCB BioPharma, Braine-l'Alleud, Belgium ; Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University, Hospital and Department of Pediatrics and Genetics , Ghent , Belgium ; Department of Endocrinology, Universitair Ziekenhuis Brussel, Brussels , Belgium ; and Department of Endocrinology, Algemeen Stedelijk Ziekenhuis Aalst, Aalst, Belgium
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Yan Z, Shyr ZA, Fortunato M, Welscher A, Alisio M, Martino M, Finck BN, Conway H, Remedi MS. High-fat-diet-induced remission of diabetes in a subset of K ATP -GOF insulin-secretory-deficient mice. Diabetes Obes Metab 2018; 20:2574-2584. [PMID: 29896801 PMCID: PMC6407888 DOI: 10.1111/dom.13423] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 06/04/2018] [Accepted: 06/09/2018] [Indexed: 02/06/2023]
Abstract
AIMS To examine the effects of a high-fat-diet (HFD) on monogenic neonatal diabetes, without the confounding effects of compensatory hyperinsulinaemia. METHODS Mice expressing KATP channel gain-of-function (KATP -GOF) mutations, which models human neonatal diabetes, were fed an HFD. RESULTS Surprisingly, KATP -GOF mice exhibited resistance to HFD-induced obesity, accompanied by markedly divergent blood glucose control, with some KATP -GOF mice showing persistent diabetes (KATP -GOF-non-remitter [NR] mice) and others showing remission of diabetes (KATP -GOF-remitter [R] mice). Compared with the severely diabetic and insulin-resistant KATP -GOF-NR mice, HFD-fed KATP -GOF-R mice had lower blood glucose, improved insulin sensitivity, and increased circulating plasma insulin and glucagon-like peptide-1 concentrations. Strikingly, while HFD-fed KATP -GOF-NR mice showed increased food intake and decreased physical activity, reduced whole body fat mass and increased plasma lipids, KATP -GOF-R mice showed similar features to those of control littermates. Importantly, KATP -GOF-R mice had restored insulin content and β-cell mass compared with the marked loss observed in both HFD-fed KATP -GOF-NR and chow-fed KATP -GOF mice. CONCLUSION Together, our results suggest that restriction of dietary carbohydrates and caloric replacement by fat can induce metabolic changes that are beneficial in reducing glucotoxicity and secondary consequences of diabetes in a mouse model of insulin-secretory deficiency.
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Affiliation(s)
- Zihan Yan
- Department of Medicine, Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
| | - Zeenat A. Shyr
- Department of Medicine, Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
| | - Manuela Fortunato
- Department of Medicine, Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
| | - Alecia Welscher
- Department of Medicine, Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
| | - Mariana Alisio
- Department of Medicine, Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
| | - Michael Martino
- Department of Medicine, Division of Geriatrics and Nutritional Science, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
| | - Brian N. Finck
- Department of Medicine, Division of Geriatrics and Nutritional Science, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
| | - Hannah Conway
- Department of Medicine, Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
| | - Maria S. Remedi
- Department of Medicine, Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
- Address all correspondence and reprint requests to MSR: Ph: (314) 362-6636,
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110
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Polysiphonia japonica Extract Attenuates Palmitate-Induced Toxicity and Enhances Insulin Secretion in Pancreatic Beta-Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:4973851. [PMID: 30510621 PMCID: PMC6230388 DOI: 10.1155/2018/4973851] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 09/18/2018] [Accepted: 09/19/2018] [Indexed: 01/08/2023]
Abstract
Beta-cell loss is a major cause of the pathogenesis of diabetes. Elevated levels of free fatty acids may contribute to the loss of β-cells. Using a transgenic zebrafish, we screened ~50 seaweed crude extracts to identify materials that protect β-cells from free fatty acid damage. We found that an extract of the red seaweed Polysiphonia japonica (PJE) had a β-cell protective effect. We examined the protective effect of PJE on palmitate-induced damage in β-cells. PJE was found to preserve cell viability and glucose-induced insulin secretion in a pancreatic β-cell line, Ins-1, treated with palmitate. Additionally, PJE prevented palmitate-induced insulin secretion dysfunction in zebrafish embryos and mouse primary islets and improved insulin secretion in β-cells against palmitate treatment. These findings suggest that PJE protects pancreatic β-cells from palmitate-induced damage. PJE may be a potential therapeutic functional food for diabetes.
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111
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Type 2 Diabetes Remission and Control in Overweight and in Mildly Obese Diabetic Patients at Long-Term Follow-Up After Biliopancreatic Diversion. Obes Surg 2018; 29:239-245. [DOI: 10.1007/s11695-018-3511-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Balaji S, Napolitano T, Silvano S, Friano ME, Garrido-Utrilla A, Atlija J, Collombat P. Epigenetic Control of Pancreatic Regeneration in Diabetes. Genes (Basel) 2018; 9:genes9090448. [PMID: 30205460 PMCID: PMC6162679 DOI: 10.3390/genes9090448] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 08/31/2018] [Accepted: 09/03/2018] [Indexed: 12/17/2022] Open
Abstract
Both type 1 and type 2 diabetes are conditions that are associated with the loss of insulin-producing β-cells within the pancreas. An active research therefore aims at regenerating these β-cells with the hope that they could restore euglycemia. The approaches classically used consist in mimicking embryonic development, making use of diverse cell sources or converting pre-existing pancreatic cells. Despite impressive progresses and promising successes, it appears that we still need to gain further insight into the molecular mechanisms underlying β-cell development. This becomes even more obvious with the emergence of a relatively new field of research, epigenetics. The current review therefore focuses on the latest advances in this field in the context of β-cell (neo-)genesis research.
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Affiliation(s)
- Shruti Balaji
- Université Nice Sophia Antipolis, Inserm, CNRS, iBV, FR-06100 Nice, France.
| | - Tiziana Napolitano
- Université Nice Sophia Antipolis, Inserm, CNRS, iBV, FR-06100 Nice, France.
| | - Serena Silvano
- Université Nice Sophia Antipolis, Inserm, CNRS, iBV, FR-06100 Nice, France.
| | - Marika Elsa Friano
- Université Nice Sophia Antipolis, Inserm, CNRS, iBV, FR-06100 Nice, France.
| | | | - Josipa Atlija
- Université Nice Sophia Antipolis, Inserm, CNRS, iBV, FR-06100 Nice, France.
| | - Patrick Collombat
- Université Nice Sophia Antipolis, Inserm, CNRS, iBV, FR-06100 Nice, France.
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113
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Wei FY, Tomizawa K. tRNA modifications and islet function. Diabetes Obes Metab 2018; 20 Suppl 2:20-27. [PMID: 30230180 DOI: 10.1111/dom.13405] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 05/30/2018] [Accepted: 06/04/2018] [Indexed: 12/26/2022]
Abstract
Efficient and accurate protein translation is essential to producing insulin in pancreatic β-cells. Transfer RNA (tRNA) is known as the key component of the protein translational machinery. Interestingly, tRNA contains a wide variety of chemical modifications, which are posttranscriptionally catalysed by tRNA modifying enzymes. Recent advances in genome-sequencing technology have unveiled a number of genetic variations that are associated with the development of type 2 diabetes (T2D). Some of these mutations are located in the genes of tRNA modifying enzymes. Using cellular and animal models, it has been showed that dysregulation of tRNA modification impairs protein translation in pancreatic β-cells and leads to aberrant insulin production. In this review, we discuss the recent findings in the molecular functions of tRNA modifications and their involvement in the development of T2D.
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Affiliation(s)
- Fan-Yan Wei
- Department of Molecular Physiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | - Kazuhito Tomizawa
- Department of Molecular Physiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
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Serum Vitamin D and Its Upregulated Protein, Thioredoxin Interacting Protein, Are Associated With Beta-Cell Dysfunction in Adult Patients With Type 1 and Type 2 Diabetes. Can J Diabetes 2018; 42:588-594. [PMID: 29980378 DOI: 10.1016/j.jcjd.2018.02.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 02/26/2018] [Indexed: 01/12/2023]
Abstract
OBJECTIVES Diabetes mellitus is characterized by either complete deficiency of insulin secretion, as in type 1 diabetes, or decompensation of the pancreatic beta cells in type 2 diabetes. Both vitamin D (vitD) and thioredoxin interacting protein (TXNIP) have been shown to be involved in beta-cell dysfunction. Therefore, this study was designed to examine vitD and TXNIP serum levels in patients with diabetes and to correlate these levels with beta-cell function markers in both types of diabetes. METHODS The routine biochemical parameters and the serum levels of vitD and TXNIP were measured in 20 patients with type 1 diabetes and 20 patients with type 2 diabetes. The levels were then compared to those of 15 healthy control volunteers. Insulin, C-peptide and proinsulin (PI), vitD and TXNIP were measured by ELISA. Beta-cell dysfunction was assessed by homeostatic model assessment (HOMA-beta), proinsulin-to-C-peptide (PI/C) and proinsulin-to-insulin (PI/I) ratios. Correlations among various parameters were studied. RESULTS Patients with type 1 diabetes had significantly lower HOMA-beta, vitD and TXNIP levels; however, they had higher PI/C levels than the control group. Meanwhile, patients with type 2 diabetes had significantly higher C-peptide, proinsulin, PI/C, HOMA-insulin resistance (HOMA-IR) and lower HOMA-beta and vitD levels, with no significant difference in TXNIP levels as compared to the control group. In addition, vitD was significantly correlated positively with HOMA-beta and TXNIP and negatively with PI, PI/C, PI/I and HOMA-IR. TXNIP correlated positively with HOMA-beta and negatively with PI/C. CONCLUSIONS Our data showed that vitD and TXNIP were associated with different beta-cell dysfunction markers, indicating their potential abilities to predict the beta-cell status in people with diabetes.
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Alanzi T. Role of Social Media in Diabetes Management in the Middle East Region: Systematic Review. J Med Internet Res 2018; 20:e58. [PMID: 29439941 PMCID: PMC5829453 DOI: 10.2196/jmir.9190] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 11/08/2017] [Accepted: 12/04/2017] [Indexed: 01/04/2023] Open
Abstract
Background Diabetes is a major health care burden in the Middle East region. Social networking tools can contribute to the management of diabetes with improved educational and care outcomes using these popular tools in the region. Objective The objective of this review was to evaluate the impact of social networking interventions on the improvement of diabetes management and health outcomes in patients with diabetes in the Middle East. Methods Peer-reviewed articles from PubMed (1990-2017) and Google Scholar (1990-2017) were identified using various combinations of predefined terms and search criteria. The main inclusion criterion consisted of the use of social networking apps on mobile phones as the primary intervention. Outcomes were grouped according to study design, type of diabetes, category of technological intervention, location, and sample size. Results This review included 5 articles evaluating the use of social media tools in the management of diabetes in the Middle East. In most studies, the acceptance rate for the use of social networking to optimize the management of diabetes was relatively high. Diabetes-specific management tools such as the Saudi Arabia Networking for Aiding Diabetes and Diabetes Intelligent Management System for Iraq systems helped collect patient information and lower hemoglobin A1c (HbA1c) levels, respectively. Conclusions The reviewed studies demonstrated the potential of social networking tools being adopted in regions in the Middle East to improve the management of diabetes. Future studies consisting of larger sample sizes spanning multiple regions would provide further insight into the use of social media for improving patient outcomes.
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Affiliation(s)
- Turki Alanzi
- Department of Health Information Management and Technology, College of Public Health, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
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Davegårdh C, García-Calzón S, Bacos K, Ling C. DNA methylation in the pathogenesis of type 2 diabetes in humans. Mol Metab 2018; 14:12-25. [PMID: 29496428 PMCID: PMC6034041 DOI: 10.1016/j.molmet.2018.01.022] [Citation(s) in RCA: 107] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 01/29/2018] [Accepted: 01/29/2018] [Indexed: 02/08/2023] Open
Abstract
Background Type 2 diabetes (T2D) is a multifactorial, polygenic disease caused by impaired insulin secretion and insulin resistance. Genome-wide association studies (GWAS) were expected to resolve a large part of the genetic component of diabetes; yet, the single nucleotide polymorphisms identified by GWAS explain less than 20% of the estimated heritability for T2D. There was subsequently a need to look elsewhere to find disease-causing factors. Mechanisms mediating the interaction between environmental factors and the genome, such as epigenetics, may be of particular importance in the pathogenesis of T2D. Scope of Review This review summarizes knowledge of the impact of epigenetics on the pathogenesis of T2D in humans. In particular, the review will focus on alterations in DNA methylation in four human tissues of importance for the disease; pancreatic islets, skeletal muscle, adipose tissue, and the liver. Case–control studies and studies examining the impact of non-genetic and genetic risk factors on DNA methylation in humans will be considered. These studies identified epigenetic changes in tissues from subjects with T2D versus non-diabetic controls. They also demonstrate that non-genetic factors associated with T2D such as age, obesity, energy rich diets, physical activity and the intrauterine environment impact the epigenome in humans. Additionally, interactions between genetics and epigenetics seem to influence the pathogenesis of T2D. Conclusions Overall, previous studies by our group and others support a key role for epigenetics in the growing incidence of T2D.
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Affiliation(s)
- Cajsa Davegårdh
- Epigenetics and Diabetes, Lund University Diabetes Centre (LUDC), Box 50332, 20213 Malmö, Sweden.
| | - Sonia García-Calzón
- Epigenetics and Diabetes, Lund University Diabetes Centre (LUDC), Box 50332, 20213 Malmö, Sweden
| | - Karl Bacos
- Epigenetics and Diabetes, Lund University Diabetes Centre (LUDC), Box 50332, 20213 Malmö, Sweden
| | - Charlotte Ling
- Epigenetics and Diabetes, Lund University Diabetes Centre (LUDC), Box 50332, 20213 Malmö, Sweden
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Kim DS, Song L, Wang J, Wu H, Gu G, Sugi Y, Li Z, Wang H. GRP94 Is an Essential Regulator of Pancreatic β-Cell Development, Mass, and Function in Male Mice. Endocrinology 2018; 159:1062-1073. [PMID: 29272356 PMCID: PMC5793778 DOI: 10.1210/en.2017-00685] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 12/08/2017] [Indexed: 12/25/2022]
Abstract
Deficiencies in pancreatic β-cell mass contribute to both type 1 and type 2 diabetes. We investigated the role of the glucose-regulated protein (GRP) 94, an endoplasmic reticulum protein abundantly expressed in the pancreatic acini and islets, in β-cell development, survival, and function. We used a conditional knockout (KO) mouse in which the GRP94 gene, Hsp90b1, was specifically deleted in pancreatic and duodenal homeobox 1 (Pdx1)-expressing cells. These Hsp90b1 flox/flox;Pdx1Cre KO mice exhibited pancreatic hypoplasia at embryonic day (E) 16.5 to E18.5 and had significantly reduced β-cell mass at 4 weeks after birth. Further mechanistic studies showed that deletion of GRP94 reduced β-cell proliferation with increased cell apoptosis in both Pdx1+ endocrine progenitor cells and differentiated β cells. Although Hsp90b1 flox/flox;Pdx1Cre KO mice remained euglycemic at 8 weeks of age, they exhibited impaired glucose tolerance. In aggregate, these findings indicate that GRP94 is an essential regulator of pancreatic β-cell development, mass, and function.
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Affiliation(s)
- Do-sung Kim
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina 29425
| | - Lili Song
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina 29425
| | - Jingjing Wang
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina 29425
| | - Hongju Wu
- Department of Medicine, Tulane University, New Orleans, Louisiana 70112
| | - Guoqiang Gu
- Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, Tennessee 37235
| | - Yukiko Sugi
- Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, South Carolina 29425
| | - Zihai Li
- Microbiology and Immunology, Medical University of South Carolina, Charleston, South Carolina 29425
| | - Hongjun Wang
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina 29425
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Bini J, Naganawa M, Nabulsi N, Huang Y, Ropchan J, Lim K, Najafzadeh S, Herold KC, Cline GW, Carson RE. Evaluation of PET Brain Radioligands for Imaging Pancreatic β-Cell Mass: Potential Utility of 11C-(+)-PHNO. J Nucl Med 2018; 59:1249-1254. [PMID: 29371405 DOI: 10.2967/jnumed.117.197285] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Accepted: 12/07/2017] [Indexed: 12/21/2022] Open
Abstract
Type 1 diabetes mellitus (T1DM) is characterized by a loss of β-cells in the islets of Langerhans of the pancreas and subsequent deficient insulin secretion in response to hyperglycemia. Development of an in vivo test to measure β-cell mass (BCM) would greatly enhance the ability to track diabetes therapies. β-cells and neurologic tissues have common cellular receptors and transporters, therefore, we screened brain radioligands for their ability to identify β-cells. Methods: We examined a β-cell gene atlas for endocrine pancreas receptor targets and cross-referenced these targets with brain radioligands that were available at our institution. Twelve healthy control subjects and 2 T1DM subjects underwent dynamic PET/CT scans with 6 tracers. Results: The D2/D3 receptor agonist radioligand 11C-(+)-4-propyl-9-hydroxynaphthoxazine (PHNO) was the only radioligand to demonstrate sustained uptake in the pancreas with high contrast versus abdominal organs such as the kidneys, liver, and spleen, based on the first 30 min of data. Mean SUV from 20 to 30 min demonstrated high uptake of 11C-(+)-PHNO in healthy controls (SUV, 13.8) with a 71% reduction in a T1DM subject with undetectable levels of C-peptide (SUV, 4.0) and a 20% reduction in a T1DM subject with fasting C-peptide level of 0.38 ng/mL (SUV, 11.0). SUV in abdominal organs outside the pancreas did not show measurable differences between the control and T1DM subjects, suggesting that the changes in SUV of 11C-(+)-PHNO may be specific to changes in the pancreas between healthy controls and T1DM subjects. When D3 and D2 antagonists were used in nonhuman primates, specific pancreatic binding (SUVR-1) of 11C-PHNO was reduced by 57% and 38%, respectively. Conclusion:11C-(+)-PHNO is a potential marker of BCM, with 2:1 binding of D3 receptors over D2 receptors. Further in vitro and in vivo studies to establish D2/D3 receptor specificity to β-cells is warranted to characterize 11C-(+)-PHNO as a candidate for clinical measurement of BCM in healthy control and diabetic subjects.
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Affiliation(s)
- Jason Bini
- PET Center, Yale University School of Medicine, New Haven, CT .,Department of Biomedical Engineering, Yale University, New Haven, CT; and
| | - Mika Naganawa
- PET Center, Yale University School of Medicine, New Haven, CT
| | - Nabeel Nabulsi
- PET Center, Yale University School of Medicine, New Haven, CT
| | - Yiyun Huang
- PET Center, Yale University School of Medicine, New Haven, CT
| | - Jim Ropchan
- PET Center, Yale University School of Medicine, New Haven, CT
| | - Keunpoong Lim
- PET Center, Yale University School of Medicine, New Haven, CT
| | | | - Kevan C Herold
- Department of Immunobiology and Internal Medicine, Yale University School of Medicine, New Haven, CT
| | - Gary W Cline
- Department of Immunobiology and Internal Medicine, Yale University School of Medicine, New Haven, CT
| | - Richard E Carson
- PET Center, Yale University School of Medicine, New Haven, CT.,Department of Biomedical Engineering, Yale University, New Haven, CT; and
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Kang HJ, Lee H, Park EM, Kim JM, Shin JS, Park CG. The value of glycated albumin for the prediction of graft outcome in the non-human primate porcine islet transplantation model. Xenotransplantation 2018; 25:e12384. [PMID: 29359356 DOI: 10.1111/xen.12384] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 12/07/2017] [Accepted: 01/02/2018] [Indexed: 02/06/2023]
Abstract
BACKGROUND The development of a precise and easy-to-use tool for monitoring islet graft function is important in clarifying the causes of graft loss, identifying appropriate therapy, and ensuring graft survival in the nonhuman primate (NHP) model of porcine islet transplantation (PITx). Glycated albumin (GA) is an indicator of intermediate-term changes in blood glucose control and is useful in clinical diabetes management. The validity of GA for monitoring graft function in NHP recipients of PITx was evaluated using a retrospective analysis of cohort samples. METHODS Data from a total of 23 PITxs performed in 20 recipients (3 were retransplanted) were included in this study. Islet clusters purified from adult wild-type pigs were transplanted via the intraportal route into streptozotocin-induced diabetic rhesus monkeys with immune suppression. Blood samples were obtained once per week from the recipients until they lost insulin-independence. Blood samples were also obtained from 69 non-diabetic monkeys that served as a control group. The levels of GA and albumin in stored plasma aliquots were measured using each enzymatic method, and the GA result was expressed as the percentage of GA level to the total albumin level. RESULTS The median level of GA in the recipients on the day of PITx (median 18.6%, 95% confidence interval [CI] 16.7%-20.4%) was significantly higher than that of healthy controls (median 9.14%, 95% CI 9.0%-9.3%, P < .0001). However, the level decreased after PITx and remained low or increased depending on the extent of residual graft function. The GA level at a nadir (median 11.6%, 95% CI 10.8%-13.0%) and the time to reach a nadir (median 43 days, 95% CI 21.7-69.3 days) both correlated with the duration of insulin-independence (rho [ρ] = -.605, P = .0028 and ρ = .662, P = .0008, respectively). The GA level strongly correlated with KG , the glucose disappearance rate during intravenous glucose tolerance testing (ρ = -.76, P < .0001). At post-transplant week (PTW) 3 and at PTW 4, the GA levels in recipients with long-term insulin-independence (>90 days) were significantly lower than those with short-term insulin-independence, which revealed the excellent performance for the prediction of long-term insulin-independence that is comparable to that of porcine C-peptide (historic data). CONCLUSIONS As a surrogate indicator for graft function, serial measurement of GA may provide Supporting Information to that obtained from conventional monitoring techniques of graft function for assessing porcine islet grafts in NHP models.
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Affiliation(s)
- Hee Jung Kang
- Department of Laboratory Medicine, Hallym University College of Medicine, Anyang-si, Korea
| | - Haneulnari Lee
- Department of Laboratory Medicine, Hallym University College of Medicine, Anyang-si, Korea
| | - Eun Mi Park
- Department of Laboratory Medicine, Hallym University College of Medicine, Anyang-si, Korea
| | - Jong-Min Kim
- Xenotransplantation Research Center, Seoul National University College of Medicine, Seoul, Korea
| | - Jun-Seop Shin
- Xenotransplantation Research Center, Seoul National University College of Medicine, Seoul, Korea
| | - Chung-Gyu Park
- Xenotransplantation Research Center, Seoul National University College of Medicine, Seoul, Korea.,Department of Microbiology and Immunology, Department of Biomedical Sciences, Cancer Research Institute, Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul, Korea
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Agarwal P, Jindal C, Sapakal V. Efficacy and Safety of Teneligliptin in Indian Patients with Inadequately Controlled Type 2 Diabetes Mellitus: A Randomized, Double-blind Study. Indian J Endocrinol Metab 2018; 22:41-46. [PMID: 29535935 PMCID: PMC5838908 DOI: 10.4103/ijem.ijem_97_16] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
AIMS This study evaluated the efficacy and safety of teneligliptin in patients with inadequately controlled type 2 diabetes mellitus (T2DM). SETTINGS AND DESIGN This was a randomized, doubleblind, placebocontrolled, parallelgroup, multicenter, Phase III study. SUBJECTS AND METHODS Patients with T2DM and inadequate glycemic control (glycosylated hemoglobin [HbA1c]: >7.0-≤8.5%) were enrolled. Patients were randomly assigned (ratio: 2:1) to receive teneligliptin 20 mg (Glenmark) or placebo. The primary efficacy variable was change from baseline in HbA1c at week 16. Additional analyses included the proportion of patients who achieved target of HbA1c ≤7.0%, changes in fasting plasma glucose (FPG), and postprandial glucose (PPG). STATISTICAL ANALYSIS Mean change in HbA1c was analyzed using an analysis of covariance model, least square (LS) means, 95% confidence intervals (CIs), and P values were calculated. RESULTS Overall, 237 patients were included. Patients of the teneligliptin group showed reduced HbA1c levels (LS mean difference = -0.304% for intent-to-treat [ITT]; -0.291% for per-protocol (PP) populations) after 16 weeks of treatment, and a statistically significant difference was observed between the ITT (LS mean difference = 0.555; 95% CI: 0.176-0.934; P = 0.0043) and PP populations (LS mean difference = 0.642; 95% CI: 0.233-1.052; P = 0.0023). Target HbA1c level was achieved by a greater proportion of teneligliptin group patients (ITT, 43.4%; PP, 43.6%) than placebo group patients (ITT, 27.3%; PP, 26.6%). Reduction in FPG levels was observed in ITT (LS mean difference: 8.829; 95% CI: -4.357-22.016; P = 0.1883) and PP populations (LS mean difference: 11.710 mg/dL; 95% CI: -2.893-26.312; P = 0.1154). Reduction in PPG levels was higher in teneligliptin group than placebo group in both ITT (LS mean difference = 25.849 mg/dL; 95% CI: 7.143-44.556; P = 0.0070) and PP populations (LS mean difference = 25.683 mg/dL; 95% CI: 5.830-45.536; P = 0.0115). Overall, 44 patients (18.6%) experienced at least one adverse event. Three or more hypoglycemic events were experienced by 2.5% patients of teneligliptin group and none in placebo group. CONCLUSION Treatment with once-daily teneligliptin led to statistically significant and clinically meaningful reductions in HbA1c and PPG, and was well tolerated in Indian patients with T2DM.
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Affiliation(s)
- Piyush Agarwal
- Department of Medical Services, Glenmark Pharmaceuticals Limited, Mumbai, Maharashtra, India
| | - Chhavi Jindal
- Department of Medical Services, Glenmark Pharmaceuticals Limited, Mumbai, Maharashtra, India
| | - Vinayak Sapakal
- Department of Medical Services, Glenmark Pharmaceuticals Limited, Mumbai, Maharashtra, India
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Wang N, Tian X, Chen Y, Tan HQ, Xie PJ, Chen SJ, Fu YC, Chen YX, Xu WC, Wei CJ. Low dose doxycycline decreases systemic inflammation and improves glycemic control, lipid profiles, and islet morphology and function in db/db mice. Sci Rep 2017; 7:14707. [PMID: 29089617 PMCID: PMC5666019 DOI: 10.1038/s41598-017-14408-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 10/09/2017] [Indexed: 02/05/2023] Open
Abstract
The aim of this study was to determine whether low dose doxycycline as an anti-inflammatory agent could improve glucose metabolism in diabetic animals. Therefore, doxycycline was supplemented in drinking water to 6-week-old male db/db mice for 10 weeks. Doxycycline reduced perirenal/epididymal fat, Lee's index, and liver cholesterol. Blood HDL-cholesterol increased, but total cholesterol and aspartate transaminase decreased. Glucose and insulin tolerances were improved, accompanying with reduced fasting blood glucose, insulin, HOMA-IR and advanced glycation end products. Islet number, β-cell percentage and mass increased, while islet size decreased. Consistently, less apoptosis but more β-cell proliferation were found in islets of treated mice. Freshly isolated islets from treated mice showed higher insulin content and enhanced glucose stimulated insulin secretion (GSIS). In addition, purified islets of Balb/c mice showed increased GSIS after cultivation in vitro with doxycycline, but not with chloramphenicol and levofloxacin. Inflammation markers, including lipopolysaccharides (LPS) and C-reactive protein (CRP) in serum as well as CD68-positive cells in treated islets, decreased significantly. Finally, LPS stimulated the production of inflammatory factors but inhibited GSIS of MIN6 cells; however, the effects were completely reversed by doxycycline. The results support further study of possible long-term usage of sub-antimicrobial doxycycline in diabetic patients.
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Affiliation(s)
- Na Wang
- Multidisciplinary Research Center, Shantou University, Shantou, 515063, Guangdong, China
| | - Xiong Tian
- Multidisciplinary Research Center, Shantou University, Shantou, 515063, Guangdong, China
| | - Yu Chen
- Multidisciplinary Research Center, Shantou University, Shantou, 515063, Guangdong, China
| | - Hui-Qi Tan
- Multidisciplinary Research Center, Shantou University, Shantou, 515063, Guangdong, China
| | - Pei-Jian Xie
- Multidisciplinary Research Center, Shantou University, Shantou, 515063, Guangdong, China
| | - Shao-Jun Chen
- Multidisciplinary Research Center, Shantou University, Shantou, 515063, Guangdong, China
| | - Yu-Cai Fu
- Laboratory of Cell Senescence, Shantou University Medical College, Shantou, Guangdong, 515041, China
| | - Yi-Xin Chen
- Department of Endocrinology, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, 515041, China
| | - Wen-Can Xu
- Department of Endocrinology, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, 515041, China.
| | - Chi-Ju Wei
- Multidisciplinary Research Center, Shantou University, Shantou, 515063, Guangdong, China.
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Song I, Roels S, Martens GA, Bouwens L. Circulating microRNA-375 as biomarker of pancreatic beta cell death and protection of beta cell mass by cytoprotective compounds. PLoS One 2017; 12:e0186480. [PMID: 29040320 PMCID: PMC5645134 DOI: 10.1371/journal.pone.0186480] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 10/02/2017] [Indexed: 12/31/2022] Open
Abstract
Objective Previous studies demonstrated that circulating microRNA-375 (miR-375) is a suitable plasma biomarker for real-time detection of beta cell death. The present study evaluated the use of this biomarker to assess the beta cytoprotective effect of phenylpropenoic acid glucoside (PPAG), which was previously demonstrated to protect beta cells against various types of injury, and of exendin-4, which is an established antidiabetic drug. Methods PPAG or exendin-4 were administered in mice treated with streptozotocin (STZ) to acutely induce beta cell death. Beta cell mass and apoptotic death were measured in pancreatic tissue sections. Circulating miR-375 was measured in blood plasma by RT-qPCR. The release of miR-375 was also measured in vitro by MIN-6 beta cells. Results Administration of STZ resulted in measurable circulating levels of miR-375, a decrease in beta cell mass and increase in frequency of apoptotic beta cells. In vitro, there was a good correlation between miR-375 release and the extent of beta cell death. Treatment of mice with PPAG or exendin-4 significantly attenuated STZ-induced loss of beta cell mass and beta cell apoptosis, and normalized the blood level of miR-375. Conclusions These findings show the potential use of serological miR-375 measurements to evaluate the beta cytoprotective effect of (potential) antidiabetic drugs in vivo.
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Affiliation(s)
- Imane Song
- Cell Differentiation Lab, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Sarah Roels
- Diabetes Research Center, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Geert A. Martens
- Diabetes Research Center, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Luc Bouwens
- Cell Differentiation Lab, Vrije Universiteit Brussel (VUB), Brussels, Belgium
- * E-mail:
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Leduc M, Richard J, Costes S, Muller D, Varrault A, Compan V, Mathieu J, Tanti JF, Pagès G, Pouyssegur J, Bertrand G, Dalle S, Ravier MA. ERK1 is dispensable for mouse pancreatic beta cell function but is necessary for glucose-induced full activation of MSK1 and CREB. Diabetologia 2017; 60:1999-2010. [PMID: 28721437 DOI: 10.1007/s00125-017-4356-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 06/02/2017] [Indexed: 11/24/2022]
Abstract
AIMS/HYPOTHESIS Insufficient insulin secretion from pancreatic beta cells, which is associated with a decrease in beta cell mass, is a characteristic of type 2 diabetes. Extracellular signal-related kinase 1 and 2 (ERK1/2) inhibition in beta cells has been reported to affect insulin secretion, gene transcription and survival, although whether ERK1 and ERK2 play distinct roles is unknown. The aim of this study was to assess the individual roles of ERK1 and ERK2 in beta cells using ERK1 (also known as Mapk3)-knockout mice (Erk1 -/- mice) and pharmacological approaches. METHODS NAD(P)H, free cytosolic Ca2+ concentration and insulin secretion were determined in islets. ERK1 and ERK2 subplasmalemmal translocation and activity was monitored using total internal reflection fluorescence microscopy. ERK1/2, mitogen and stress-activated kinase1 (MSK1) and cAMP-responsive element-binding protein (CREB) activation were evaluated by western blot and/or immunocytochemistry. The islet mass was determined from pancreatic sections. RESULTS Glucose induced rapid subplasmalemmal recruitment of ERK1 and ERK2. When both ERK1 and ERK2 were inhibited simultaneously, the rapid transient peak of the first phase of glucose-induced insulin secretion was reduced by 40% (p < 0.01), although ERK1 did not appear to be involved in this process. By contrast, ERK1 was required for glucose-induced full activation of several targets involved in beta cell survival; MSK1 and CREB were less active in Erk1 -/- mouse beta cells (p < 0.01) compared with Erk1 +/+ mouse beta cells, and their phosphorylation could only be restored when ERK1 was re-expressed and not when ERK2 was overexpressed. Finally, the islet mass of Erk1 -/- mice was slightly increased in young animals (4-month-old mice) vs Erk1 +/+ mice (section occupied by islets [mean ± SEM]: 0.74% ± 0.03% vs 0.62% ± 0.04%; p < 0.05), while older mice (10 months old) were less prone to age-associated pancreatic peri-insulitis (infiltrated islets [mean ± SEM]: 7.51% ± 1.34% vs 2.03% ± 0.51%; p < 0.001). CONCLUSIONS/INTERPRETATION ERK1 and ERK2 play specific roles in beta cells. ERK2 cannot always compensate for the lack of ERK1 but the absence of a clear-cut phenotype in Erk1 -/- mice shows that ERK1 is dispensable in normal conditions.
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Affiliation(s)
- Michele Leduc
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France
| | - Joy Richard
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France
| | - Safia Costes
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France
| | - Dany Muller
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France
| | - Annie Varrault
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France
| | - Vincent Compan
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France
| | - Julia Mathieu
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France
| | - Jean-François Tanti
- Faculté de Médecine, Centre Méditerranéen de Médecine Moléculaire, Inserm U1065, Université de Nice Sophia Antipolis, Nice, France
| | - Gilles Pagès
- Institute for Research on Cancer and Aging, Nice (IRCAN), Centre Antoine Lacassagne, Université de Nice Sophia Antipolis, Nice, France
| | - Jacques Pouyssegur
- Institute for Research on Cancer and Aging, Nice (IRCAN), Centre Antoine Lacassagne, Université de Nice Sophia Antipolis, Nice, France
- Medical Biology Department, Centre Scientifique de Monaco (CSM), Monaco, Principality of Monaco
| | - Gyslaine Bertrand
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France
| | - Stéphane Dalle
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France
| | - Magalie A Ravier
- Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique (CNRS), Inserm, Université de Montpellier, 141 Rue de la Cardonille, 34094, Montpellier CEDEX 5, France.
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Horiuchi Y, Nakatsu D, Kano F, Murata M. Pyruvate kinase M1 interacts with A-Raf and inhibits endoplasmic reticulum stress-induced apoptosis by activating MEK1/ERK pathway in mouse insulinoma cells. Cell Signal 2017; 38:212-222. [PMID: 28743549 DOI: 10.1016/j.cellsig.2017.07.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 07/20/2017] [Accepted: 07/20/2017] [Indexed: 12/19/2022]
Abstract
Apoptotic death of pancreatic β cells is a major cause of type 2 diabetes mellitus (T2D) progression. Two isoforms of pyruvate kinase, PKM1 and PKM2, have been reported to participate in cell death in several cell types; however, little is known about their causal pathways in pancreatic β-cell death. We examined whether the suppression of PKM1 or PKM2 affects endoplasmic reticulum (ER) stress-induced apoptosis in a pancreatic β-cell line, MIN6, and Beta-TC-6 and found that knockdown of PKM1, but not of PKM2, leads to the induction of ER stress-induced apoptosis in these cells. We also investigated the mechanism by which PKM1 inhibits ER stress-induced apoptosis. We confirmed that PKM1 interacts with A-Raf, an upstream regulator of the MEK/ERK pathway, and that this interaction contributes to MEK1 phosphorylation by A-Raf. PKM1 knockdown suppresses the phosphorylation of MEK, ERK, and caspase-9 (Thr125), which is phosphorylated by the MEK/ERK pathway, thereby inhibiting the cleavage and activation of caspase-9. Thus, PKM1 knockdown activates the caspase-9/caspase-3 pathway under ER stress conditions and leads to apoptosis.
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Affiliation(s)
- Yuta Horiuchi
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Daiki Nakatsu
- Cell Biology Unit, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Fumi Kano
- Cell Biology Unit, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Masayuki Murata
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan; Cell Biology Unit, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan.
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125
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Kawada Y, Asahara SI, Sugiura Y, Sato A, Furubayashi A, Kawamura M, Bartolome A, Terashi-Suzuki E, Takai T, Kanno A, Koyanagi-Kimura M, Matsuda T, Hashimoto N, Kido Y. Histone deacetylase regulates insulin signaling via two pathways in pancreatic β cells. PLoS One 2017; 12:e0184435. [PMID: 28886131 PMCID: PMC5590960 DOI: 10.1371/journal.pone.0184435] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 07/23/2017] [Indexed: 12/23/2022] Open
Abstract
Recent studies demonstrated that insulin signaling plays important roles in the regulation of pancreatic β cell mass, the reduction of which is known to be involved in the development of diabetes. However, the mechanism underlying the alteration of insulin signaling in pancreatic β cells remains unclear. The involvement of epigenetic control in the onset of diabetes has also been reported. Thus, we analyzed the epigenetic control of insulin receptor substrate 2 (IRS2) expression in the MIN6 mouse insulinoma cell line. We found concomitant IRS2 up-regulation and enhanced insulin signaling in MIN6 cells, which resulted in an increase in cell proliferation. The H3K9 acetylation status of the Irs2 promoter was positively associated with IRS2 expression. Treatment of MIN6 cells with histone deacetylase inhibitors led to increased IRS2 expression, but this occurred in concert with low insulin signaling. We observed increased IRS2 lysine acetylation as a consequence of histone deacetylase inhibition, a modification that was coupled with a decrease in IRS2 tyrosine phosphorylation. These results suggest that insulin signaling in pancreatic β cells is regulated by histone deacetylases through two novel pathways affecting IRS2: the epigenetic control of IRS2 expression by H3K9 promoter acetylation, and the regulation of IRS2 activity through protein modification. The identification of the histone deacetylase isoform(s) involved in these mechanisms would be a valuable approach for the treatment of type 2 diabetes.
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Affiliation(s)
- Yukina Kawada
- Division of Metabolism and Disease, Department of Biophysics, Kobe University Graduate School of Health Sciences, Kobe, Japan
| | - Shun-ichiro Asahara
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Yumiko Sugiura
- Division of Metabolism and Disease, Department of Biophysics, Kobe University Graduate School of Health Sciences, Kobe, Japan
| | - Ayaka Sato
- Medical Technology Major, Faculty of Health Sciences Major, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Ayuko Furubayashi
- Medical Technology Major, Faculty of Health Sciences Major, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Mao Kawamura
- Medical Technology Major, Faculty of Health Sciences Major, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Alberto Bartolome
- Department of Medicine, Columbia University Medical Center, New York, New York, United States of America
| | - Emi Terashi-Suzuki
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Tomoko Takai
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Ayumi Kanno
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Maki Koyanagi-Kimura
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Tomokazu Matsuda
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Naoko Hashimoto
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Yoshiaki Kido
- Division of Metabolism and Disease, Department of Biophysics, Kobe University Graduate School of Health Sciences, Kobe, Japan
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
- * E-mail:
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Ren L, Yang H, Cui Y, Xu S, Sun F, Tian N, Hua J, Peng S. Autophagy is essential for the differentiation of porcine PSCs into insulin-producing cells. Biochem Biophys Res Commun 2017; 488:471-476. [PMID: 28501624 DOI: 10.1016/j.bbrc.2017.05.058] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Accepted: 05/09/2017] [Indexed: 12/21/2022]
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127
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Molecular mechanisms of ROS production and oxidative stress in diabetes. Biochem J 2017; 473:4527-4550. [PMID: 27941030 DOI: 10.1042/bcj20160503c] [Citation(s) in RCA: 517] [Impact Index Per Article: 73.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 10/07/2016] [Accepted: 10/10/2016] [Indexed: 12/18/2022]
Abstract
Oxidative stress and chronic inflammation are known to be associated with the development of metabolic diseases, including diabetes. Oxidative stress, an imbalance between oxidative and antioxidative systems of cells and tissues, is a result of over production of oxidative-free radicals and associated reactive oxygen species (ROS). One outcome of excessive levels of ROS is the modification of the structure and function of cellular proteins and lipids, leading to cellular dysfunction including impaired energy metabolism, altered cell signalling and cell cycle control, impaired cell transport mechanisms and overall dysfunctional biological activity, immune activation and inflammation. Nutritional stress, such as that caused by excess high-fat and/or carbohydrate diets, promotes oxidative stress as evident by increased lipid peroxidation products, protein carbonylation and decreased antioxidant status. In obesity, chronic oxidative stress and associated inflammation are the underlying factors that lead to the development of pathologies such as insulin resistance, dysregulated pathways of metabolism, diabetes and cardiovascular disease through impaired signalling and metabolism resulting in dysfunction to insulin secretion, insulin action and immune responses. However, exercise may counter excessive levels of oxidative stress and thus improve metabolic and inflammatory outcomes. In the present article, we review the cellular and molecular origins and significance of ROS production, the molecular targets and responses describing how oxidative stress affects cell function including mechanisms of insulin secretion and action, from the point of view of possible application of novel diabetic therapies based on redox regulation.
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128
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Regulator of G protein signaling 2 is a key regulator of pancreatic β-cell mass and function. Cell Death Dis 2017; 8:e2821. [PMID: 28542139 PMCID: PMC5520679 DOI: 10.1038/cddis.2016.216] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 06/02/2016] [Accepted: 06/07/2016] [Indexed: 12/29/2022]
Abstract
Pancreatic β-cell death and dysfunction contributes to the pathogenesis of both type 1 and type 2 diabetes. We aimed to examine whether the regulator of G protein signaling protein 2 (RGS2), a multifunctional inhibitor of G protein-coupled receptor (GPCR) signaling, impacts β-cell death and function. Metabolic phenotypes, β-cell secretory function, and glucose and insulin tolerance were measured in RGS2 knockout (RGS2−/−) mice and their wild-type (RGS2+/+) littermate controls. β-Cell death was evaluated in RGS2-knockdown and -overexpressing β cells and RGS2−/− islets by flow cytometry, western blot, ELISA, TUNEL staining, and apoptosis RT2 profiler PCR array analysis. β-Cell mass was evaluated in pancreases from RGS2−/− and RGS2+/+ mice at 1 day, 4 weeks, and 25 weeks of age. Our data show that RGS2−/− islets secreted more insulin than RGS2+/+ islets when challenged with glucose or exendin-4. RGS2-knockdown cells are susceptible to hypoxia induced cell death while RGS2-overexpressing cells are protected from cell death. Depletion of RGS2 in islets alters expression of apoptosis-related genes and RGS2−/− islets are prone to apoptosis compared with RGS2+/+ islets. Ultimately, excessive insulin secretion and increased β-cell apoptosis contributed to a 70% reduction in pancreatic β-cell mass in RGS2−/− mice compared with RGS2+/+ mice at 25 weeks of age. RGS2 has critical roles in maintaining pancreatic β-cell mass via modulating β-cell function and apoptosis. It may serve as a druggable target to help prevent pancreatic β-cell loss in the treatment of diabetes.
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129
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Gupta D, Jetton TL, LaRock K, Monga N, Satish B, Lausier J, Peshavaria M, Leahy JL. Temporal characterization of β cell-adaptive and -maladaptive mechanisms during chronic high-fat feeding in C57BL/6NTac mice. J Biol Chem 2017; 292:12449-12459. [PMID: 28487366 DOI: 10.1074/jbc.m117.781047] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 04/29/2017] [Indexed: 12/18/2022] Open
Abstract
The onset of type 2 diabetes is characterized by transition from successful to failed insulin secretory compensation to obesity-related insulin resistance and dysmetabolism. Energy-rich diets in rodents are commonly studied models of compensatory increases in both insulin secretion and β cell mass. However, the mechanisms of these adaptive responses are incompletely understood, and it is also unclear why these responses eventually fail. We measured the temporal trends of glucose homeostasis, insulin secretion, β cell morphometry, and islet gene expression in C57BL/6NTac mice fed a 60% high-fat diet (HFD) or control diet for up to 16 weeks. A 2-fold increased hyperinsulinemia was maintained for the first 4 weeks of HFD feeding and then further increased through 16 weeks. β cell mass increased progressively starting at 4 weeks, principally through nonproliferative growth. Insulin sensitivity was not significantly perturbed until 11 weeks of HFD feeding. Over the first 8 weeks, we observed two distinct waves of increased expression of β cell functional and prodifferentiation genes. This was followed by activation of the unfolded protein response at 8 weeks and overt β cell endoplasmic reticulum stress at 12-16 weeks. In summary, β cell adaptation to an HFD in C57BL/6NTac mice entails early insulin hypersecretion and a robust growth phase along with hyperexpression of related genes that begin well before the onset of observed insulin resistance. However, continued HFD exposure results in cessation of gene hyperexpression, β cell functional failure, and endoplasmic reticulum stress. These data point to a complex but not sustainable integration of β cell-adaptive responses to nutrient overabundance, obesity development, and insulin resistance.
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Affiliation(s)
- Dhananjay Gupta
- Division of Endocrinology, Diabetes, and Metabolism, University of Vermont, Burlington, Vermont 05446
| | - Thomas L Jetton
- Division of Endocrinology, Diabetes, and Metabolism, University of Vermont, Burlington, Vermont 05446
| | - Kyla LaRock
- Division of Endocrinology, Diabetes, and Metabolism, University of Vermont, Burlington, Vermont 05446
| | - Navjot Monga
- Division of Endocrinology, Diabetes, and Metabolism, University of Vermont, Burlington, Vermont 05446
| | - Basanthi Satish
- Division of Endocrinology, Diabetes, and Metabolism, University of Vermont, Burlington, Vermont 05446
| | - James Lausier
- Division of Endocrinology, Diabetes, and Metabolism, University of Vermont, Burlington, Vermont 05446
| | - Mina Peshavaria
- Division of Endocrinology, Diabetes, and Metabolism, University of Vermont, Burlington, Vermont 05446
| | - Jack L Leahy
- Division of Endocrinology, Diabetes, and Metabolism, University of Vermont, Burlington, Vermont 05446.
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130
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Chen YC, Tung YC, Liu SY, Lee CT, Tsai WY. Clinical characteristics of type 1 diabetes mellitus in Taiwanese children aged younger than 6 years: A single-center experience. J Formos Med Assoc 2017; 116:340-344. [DOI: 10.1016/j.jfma.2016.07.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 07/12/2016] [Accepted: 07/13/2016] [Indexed: 01/08/2023] Open
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131
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β Cell Aging Markers Have Heterogeneous Distribution and Are Induced by Insulin Resistance. Cell Metab 2017; 25:898-910.e5. [PMID: 28380379 PMCID: PMC5471618 DOI: 10.1016/j.cmet.2017.03.015] [Citation(s) in RCA: 132] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 01/10/2017] [Accepted: 03/21/2017] [Indexed: 01/09/2023]
Abstract
We hypothesized that the known heterogeneity of pancreatic β cells was due to subpopulations of β cells at different stages of their life cycle with different functional capacities and that further changes occur with metabolic stress and aging. We identified new markers of aging in β cells, including IGF1R. In β cells IGF1R expression correlated with age, dysfunction, and expression of known age markers p16ink4a, p53BP1, and senescence-associated β-galactosidase. The new markers showed striking heterogeneity both within and between islets in both mouse and human pancreas. Acute induction of insulin resistance with an insulin receptor antagonist or chronic ER stress resulted in increased expression of aging markers, providing insight into how metabolic stress might accelerate dysfunction and decline of β cells. These novel findings about β cell and islet heterogeneity, and how they change with age, open up an entirely new set of questions about the pathogenesis of type 2 diabetes.
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132
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Amisten S, Mohammad Al-Amily I, Soni A, Hawkes R, Atanes P, Persaud SJ, Rorsman P, Salehi A. Anti-diabetic action of all-trans retinoic acid and the orphan G protein coupled receptor GPRC5C in pancreatic β-cells. Endocr J 2017; 64:325-338. [PMID: 28228611 DOI: 10.1507/endocrj.ej16-0338] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Pancreatic islets express high levels of the orphan G-protein coupled receptor C5C (GPRC5C), the function of which remains to be established. Here we have examined the role of GPRC5C in the regulation of insulin secretion and β-cell survival and proliferation using human and mouse pancreatic islets. The expression of GPRC5C was analysed by RNA-sequencing, qPCR, western blotting and confocal microscopy. Insulin secretion and cell viability were determined by RIA and MTS assays, respectively. GPRC5C mRNA expression and protein level were reduced in the islets from type-2 diabetic donors. RNA sequencing in human islets revealed GPRC5C expression correlated with the expression of genes controlling apoptosis, cell survival and proliferation. A reduction in Gprc5c mRNA and protein expression was observed in islets isolated from old mice (>46 weeks of age) compared to that in islets from newborn (<3 weeks) mice. Down-regulation of Gprc5c led to both moderately reduced glucose-stimulated insulin release and also reduced cAMP content in mouse islets. Potentiation of glucose-stimulated insulin secretion concomitant with enhanced islet cAMP level by all-trans retinoic acid (ATRA) was attenuated upon Gprc5c-KD. ATRA also increased [Ca+2]i in Huh7-cells. Gprc5c over expression in Huh7 cells was associated with increased ERK1/2 activity. Gprc5c-KD in clonal MIN6c4 cells reduced cell proliferation and in murine islets increased apoptosis and the sensitivity of primary islet cells to a cocktail of pro-apoptotic cytokines. Our results demonstrate that agents activating GPRC5C represent a novel modality for the treatment and/or prevention of diabetes by restoring and/or maintaining functional β-cell mass.
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Affiliation(s)
- Stefan Amisten
- The Oxford Centre for Diabetes, Endocrinology & Metabolism, University of Oxford, Oxford, UK
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133
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Ebrahimi A, Jung MH, Dreyfuss JM, Pan H, Sgroi D, Bonner-Weir S, Weir GC. Evidence of stress in β cells obtained with laser capture microdissection from pancreases of brain dead donors. Islets 2017; 9:19-29. [PMID: 28252345 PMCID: PMC5345752 DOI: 10.1080/19382014.2017.1283083] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Isolated islets used for transplantation are known to be stressed, which can result from the circumstances of death, in particular brain death, the preservation of the pancreas with its warm and cold ischemia, from the trauma of the isolation process, and the complex events that occur during tissue culture. The current study focused upon the events that occur before the islet isolation procedure. Pancreases were obtained from brain dead donors (n = 7) with mean age 50 (11) and normal pancreatic tissue obtained at surgery done for pancreatic neoplasms (n = 7), mean age 69 (9). Frozen sections were subjected to laser capture microdissection (LCM) to obtain β-cell rich islet tissue, from which extracted RNA was analyzed with microarrays. Gene expression of the 2 groups was evaluated with differential expression analysis for genes and pathways. Marked changes were found in pathways concerned with endoplasmic reticulum stress with its unfolded protein response (UPR), apoptotic pathways and components of inflammation. In addition, there were changes in genes important for islet cell identity. These findings advance our understanding of why islets are stressed before transplantation, which may lead to strategies to reduce this stress and lead to better clinical outcomes.
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Affiliation(s)
- Aref Ebrahimi
- Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Min-Ho Jung
- Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Jonathan M. Dreyfuss
- Bioinformatics Core, Joslin Diabetes Center, Research Division, Boston, MA, USA
- Department of Biomedical Engineering, Boston University, Boston, MA, USA
| | - Hui Pan
- Bioinformatics Core, Joslin Diabetes Center, Research Division, Boston, MA, USA
- Department of Biomedical Engineering, Boston University, Boston, MA, USA
| | - Dennis Sgroi
- Massachusetts General Hospital, Department of Molecular Pathology, Harvard Medical School, Boston, MA, USA
| | | | - Gordon C. Weir
- Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
- CONTACT Gordon C. Weir, MD Research Division, Joslin Diabetes Center, One Joslin Place, Boston, MA 02215, USA
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134
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Weir GC, Bonner-Weir S. Glucose Driven Changes in Beta Cell Identity Are Important for Function and Possibly Autoimmune Vulnerability during the Progression of Type 1 Diabetes. Front Genet 2017; 8:2. [PMID: 28174593 PMCID: PMC5258704 DOI: 10.3389/fgene.2017.00002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 01/09/2017] [Indexed: 02/05/2023] Open
Abstract
This commentary explores the hypothesis that when autoimmunity leads to a fall of beta cell mass during the progression of type 1 diabetes (T1D), rising glucose levels cause major changes in beta cell identity. This then leads to profound changes in secretory function and less well-understood changes in beta cell susceptibility to autoimmune destruction, which may influence of rate of progression of beta cell killing.
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Affiliation(s)
- Gordon C Weir
- Joslin Diabetes Center, Harvard Medical School Boston, MA, USA
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135
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Abstract
GABA and the antimalarial drug artemether, which acts on GABAergic pathways, can drive pancreatic cells with an α-cell phenotype toward a β-cell-like phenotype. As reported in two papers (Ben-Othman et al. and Li et al.), these drugs can stimulate the production of sufficient numbers of new β-like cells to reverse severe diabetes in mice.
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Affiliation(s)
- Gordon C Weir
- Research Division, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA.
| | - Susan Bonner-Weir
- Research Division, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA
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136
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Podell BK, Ackart DF, Richardson MA, DiLisio JE, Pulford B, Basaraba RJ. A model of type 2 diabetes in the guinea pig using sequential diet-induced glucose intolerance and streptozotocin treatment. Dis Model Mech 2017; 10:151-162. [PMID: 28093504 PMCID: PMC5312002 DOI: 10.1242/dmm.025593] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 12/07/2016] [Indexed: 01/04/2023] Open
Abstract
Type 2 diabetes is a leading cause of morbidity and mortality among noncommunicable diseases, and additional animal models that more closely replicate the pathogenesis of human type 2 diabetes are needed. The goal of this study was to develop a model of type 2 diabetes in guinea pigs, in which diet-induced glucose intolerance precedes β-cell cytotoxicity, two processes that are crucial to the development of human type 2 diabetes. Guinea pigs developed impaired glucose tolerance after 8 weeks of feeding on a high-fat, high-carbohydrate diet, as determined by oral glucose challenge. Diet-induced glucose intolerance was accompanied by β-cell hyperplasia, compensatory hyperinsulinemia, and dyslipidemia with hepatocellular steatosis. Streptozotocin (STZ) treatment alone was ineffective at inducing diabetic hyperglycemia in guinea pigs, which failed to develop sustained glucose intolerance or fasting hyperglycemia and returned to euglycemia within 21 days after treatment. However, when high-fat, high-carbohydrate diet-fed guinea pigs were treated with STZ, glucose intolerance and fasting hyperglycemia persisted beyond 21 days post-STZ treatment. Guinea pigs with diet-induced glucose intolerance subsequently treated with STZ demonstrated an insulin-secretory capacity consistent with insulin-independent diabetes. This insulin-independent state was confirmed by response to oral antihyperglycemic drugs, metformin and glipizide, which resolved glucose intolerance and extended survival compared with guinea pigs with uncontrolled diabetes. In this study, we have developed a model of sequential glucose intolerance and β-cell loss, through high-fat, high-carbohydrate diet and extensive optimization of STZ treatment in the guinea pig, which closely resembles human type 2 diabetes. This model will prove useful in the study of insulin-independent diabetes pathogenesis with or without comorbidities, where the guinea pig serves as a relevant model species.
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Affiliation(s)
- Brendan K Podell
- Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA
| | - David F Ackart
- Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA
| | - Michael A Richardson
- Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA
| | - James E DiLisio
- Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA
| | - Bruce Pulford
- Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA
| | - Randall J Basaraba
- Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA
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137
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Eberhard D, Lammert E. The Role of the Antioxidant Protein DJ-1 in Type 2 Diabetes Mellitus. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1037:173-186. [PMID: 29147909 DOI: 10.1007/978-981-10-6583-5_11] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Type 2 diabetes mellitus (T2DM) is a worldwide escalating health disorder resulting from insulin resistance and functional loss of insulin-producing beta cells that finally cause chronically elevated blood glucose concentrations. Here we review the role of ubiquitously expressed antioxidant protein DJ-1 in the pathogenesis of T2DM. In beta cells, DJ-1 protects against oxidative stress, endoplasmic reticulum stress, and streptozotocin- and cytokine-induced stress and preserves beta cell viability and insulin secretion. In skeletal muscle, DJ-1 controls energy metabolism and efficient fuel utilization, whereas in adipose tissue a role in adipogenesis and obesity-induced inflammation has been reported. This suggests that DJ-1 plays multiple roles in many cell types under metabolically challenging conditions as seen in obesity, insulin resistance, and T2DM.
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Affiliation(s)
- Daniel Eberhard
- Institute of Metabolic Physiology, Department of Biology, Heinrich Heine University, D-40225, Düsseldorf, Germany.
| | - Eckhard Lammert
- Institute of Metabolic Physiology, Department of Biology, Heinrich Heine University, D-40225, Düsseldorf, Germany. .,Institute for Beta Cell Biology, German Diabetes Center, Leibniz Center for Diabetes, Research at Heinrich Heine University, D-40225, Düsseldorf, Germany. .,German Center for Diabetes Research (DZD e.V.), D-85764, München-Neuherberg, Germany.
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138
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Chen Y, Tian L, Wan S, Xie Y, Chen X, Ji X, Zhao Q, Wang C, Zhang K, Hock JM, Tian H, Yu X. MicroRNA-17-92 cluster regulates pancreatic beta-cell proliferation and adaptation. Mol Cell Endocrinol 2016; 437:213-223. [PMID: 27568466 DOI: 10.1016/j.mce.2016.08.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 08/22/2016] [Accepted: 08/23/2016] [Indexed: 10/21/2022]
Abstract
MiR-17-92 cluster contributes to the regulation of mammalian development, aging and tumorigenesis. The functional roles of miR-17-92 in pancreatic beta-cells are largely unknown. In this study, we found that conditional deletion of miR-17-92 in mouse pancreatic beta-cells (miR-17-92βKO) significantly reduces glucose tolerance and the first phase of insulin secretion, despite normal ad libitum fed and fasting glucose levels. Proliferation is down-regulated in pancreatic beta-cells after deleting miR-17-92. MiR-17-92βKO mice show higher phosphatase and tensin homologue (PTEN) and lower phosphorylated AKT in islets. Under high fat diet challenge for 16 weeks, miR-17-92βKO mice lose compensation and exhibit higher glucose levels, and lower insulin secretion. Collectively, these data suggest that miR-17-92 is a critical contributor to molecular mechanisms regulating glucose-stimulated insulin secretion and pancreatic beta-cell adaptation under metabolic stress.
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Affiliation(s)
- Yaxi Chen
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Li Tian
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Shan Wan
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Ying Xie
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Xiang Chen
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Xiao Ji
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Qian Zhao
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Chunyu Wang
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Kun Zhang
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Janet M Hock
- The Polis Center, Indiana University-Purdue University Indianapolis, 1200 Waterway Blvd # 100, Indianapolis, IN 46202, USA
| | - Haoming Tian
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China
| | - Xijie Yu
- Laboratory of Endocrinology and Metabolism, Department of Endocrinology, National Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610041, PR China.
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139
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Guay C, Regazzi R. New emerging tasks for microRNAs in the control of β-cell activities. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:2121-2129. [DOI: 10.1016/j.bbalip.2016.05.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 04/22/2016] [Accepted: 05/02/2016] [Indexed: 12/26/2022]
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140
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Viloria K, Munasinghe A, Asher S, Bogyere R, Jones L, Hill NJ. A holistic approach to dissecting SPARC family protein complexity reveals FSTL-1 as an inhibitor of pancreatic cancer cell growth. Sci Rep 2016; 6:37839. [PMID: 27886258 PMCID: PMC5122892 DOI: 10.1038/srep37839] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 11/02/2016] [Indexed: 02/06/2023] Open
Abstract
SPARC is a matricellular protein that is involved in both pancreatic cancer and diabetes. It belongs to a wider family of proteins that share structural and functional similarities. Relatively little is known about this extended family, but evidence of regulatory interactions suggests the importance of a holistic approach to their study. We show that Hevin, SPOCKs, and SMOCs are strongly expressed within islets, ducts, and blood vessels, suggesting important roles for these proteins in the normal pancreas, while FSTL-1 expression is localised to the stromal compartment reminiscent of SPARC. In direct contrast to SPARC, however, FSTL-1 expression is reduced in pancreatic cancer. Consistent with this, FSTL-1 inhibited pancreatic cancer cell proliferation. The complexity of SPARC family proteins is further revealed by the detection of multiple cell-type specific isoforms that arise due to a combination of post-translational modification and alternative splicing. Identification of splice variants lacking a signal peptide suggests the existence of novel intracellular isoforms. This study underlines the importance of addressing the complexity of the SPARC family and provides a new framework to explain their controversial and contradictory effects. We also demonstrate for the first time that FSTL-1 suppresses pancreatic cancer cell growth.
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Affiliation(s)
- Katrina Viloria
- Department of Biomolecular Sciences, Kingston University, Kingston-upon-Thames, UK
| | - Amanda Munasinghe
- Department of Biomolecular Sciences, Kingston University, Kingston-upon-Thames, UK
| | - Sharan Asher
- Department of Biomolecular Sciences, Kingston University, Kingston-upon-Thames, UK
| | - Roberto Bogyere
- Department of Biomolecular Sciences, Kingston University, Kingston-upon-Thames, UK
| | - Lucy Jones
- Department of Biomolecular Sciences, Kingston University, Kingston-upon-Thames, UK
| | - Natasha J. Hill
- Department of Biomolecular Sciences, Kingston University, Kingston-upon-Thames, UK
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141
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Benthuysen JR, Carrano AC, Sander M. Advances in β cell replacement and regeneration strategies for treating diabetes. J Clin Invest 2016; 126:3651-3660. [PMID: 27694741 DOI: 10.1172/jci87439] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
In the past decade, new approaches have been explored that are aimed at restoring functional β cell mass as a treatment strategy for diabetes. The two most intensely pursued strategies are β cell replacement through conversion of other cell types and β cell regeneration by enhancement of β cell replication. The approach closest to clinical implementation is the replacement of β cells with human pluripotent stem cell-derived (hPSC-derived) cells, which are currently under investigation in a clinical trial to assess their safety in humans. In addition, there has been success in reprogramming developmentally related cell types into β cells. Reprogramming approaches could find therapeutic applications by inducing β cell conversion in vivo or by reprogramming cells ex vivo followed by implantation. Finally, recent studies have revealed novel pharmacologic targets for stimulating β cell replication. Manipulating these targets or the pathways they regulate could be a strategy for promoting the expansion of residual β cells in diabetic patients. Here, we provide an overview of progress made toward β cell replacement and regeneration and discuss promises and challenges for clinical implementation of these strategies.
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142
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Critical role for adenosine receptor A2a in β-cell proliferation. Mol Metab 2016; 5:1138-1146. [PMID: 27818940 PMCID: PMC5081418 DOI: 10.1016/j.molmet.2016.09.006] [Citation(s) in RCA: 21] [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: 07/21/2016] [Revised: 09/09/2016] [Accepted: 09/14/2016] [Indexed: 01/09/2023] Open
Abstract
Objective Pharmacological activation of adenosine signaling has been shown to increase β-cell proliferation and thereby β-cell regeneration in zebrafish and rodent models of diabetes. However, whether adenosine has an endogenous role in regulating β-cell proliferation is unknown. The objective of this study was to determine whether endogenous adenosine regulates β-cell proliferation—either in the basal state or states of increased demand for insulin—and to delineate the mechanisms involved. Methods We analyzed the effect of pharmacological adenosine agonists on β-cell proliferation in in vitro cultures of mouse islets and in zebrafish models with β- or δ-cell ablation. In addition, we performed physiological and histological characterization of wild-type mice and mutant mice with pancreas- or β-cell-specific deficiency in Adora2a (the gene encoding adenosine receptor A2a). The mutant mice were used for in vivo studies on the role of adenosine in the basal state and during pregnancy (a state of increased demand for insulin), as well as for in vitro studies of cultured islets. Results Pharmacological adenosine signaling in zebrafish had a stronger effect on β-cell proliferation during β-cell regeneration than in the basal state, an effect that was independent of the apoptotic microenvironment of the regeneration model. In mice, deficiency in Adora2a impaired glucose control and diminished compensatory β-cell proliferation during pregnancy but did not have any overt phenotype in the basal state. Islets isolated from Adora2a-deficient mice had a reduced baseline level of β-cell proliferation in vitro, consistent with our finding that UK432097, an A2a-specific agonist, promotes the proliferation of mouse β-cells in vitro. Conclusions This is the first study linking endogenously produced adenosine to β-cell proliferation. Moreover, we show that adenosine signaling via the A2a receptor has an important role in compensatory β-cell proliferation, a feature that could be harnessed pharmacologically for β-cell expansion and future therapeutic development for diabetes. Adenosine regulates homeostatic control of β-cell proliferation. Adenosine signaling via A2a regulates glucose control and β-cell proliferation in pregnancy. Pharmacological agonism of specifically A2a induces proliferation of β cells.
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143
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Remedi MS, Emfinger C. Pancreatic β-cell identity in diabetes. Diabetes Obes Metab 2016; 18 Suppl 1:110-6. [PMID: 27615139 PMCID: PMC5021188 DOI: 10.1111/dom.12727] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Accepted: 05/26/2016] [Indexed: 12/18/2022]
Abstract
Recovery of functional β-cell mass continues to be an ongoing challenge in treating diabetes. Initial work studying β-cells suggested apoptotic β-cell death as a main contributor for the loss of β-cell mass in diabetes. Restoration of β-cells either by transplant or stimulating proliferation of remaining β-cells or precursors would then logically be a viable therapeutic option for diabetes. However, recent work has highlighted the inherent β-cell plasticity and the critical role of loss of β-cell identity in diabetes, and has suggested that β-cells fail to maintain a fully differentiated glucose-responsive and drug-responsive state, particularly in diabetic individuals with poorly controlled, long-lasting periods of hyperglycaemia. Understanding the underlying mechanisms of loss of β-cell identity and conversion in other cell types, as well as how to regain their mature differentiated functional state, is critical to develop novel therapeutic strategies to prevent or reverse these processes. In this review, we discuss the role of plasticity and loss of β-cell identity in diabetes, the current understanding of mechanisms involved in altering this mature functional β-cell state and potential progresses to identify novel therapeutic targets providing better opportunities for slowing or preventing diabetes progression.
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Affiliation(s)
- M S Remedi
- Department of Medicine and Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri.
| | - C Emfinger
- Department of Medicine and Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri
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144
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Huang Y, Liu C, Eisses JF, Husain SZ, Rohde GK. A supervised learning framework for pancreatic islet segmentation with multi-scale color-texture features and rolling guidance filters. Cytometry A 2016; 89:893-902. [PMID: 27560544 DOI: 10.1002/cyto.a.22929] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 05/18/2016] [Accepted: 07/27/2016] [Indexed: 12/15/2022]
Abstract
Islet cell quantification and function is important for developing novel therapeutic interventions for diabetes. Existing methods of pancreatic islet segmentation in histopathological images depend strongly on cell/nuclei detection, and thus are limited due to a wide variance in the appearance of pancreatic islets. In this paper, we propose a supervised learning pipeline to segment pancreatic islets in histopathological images, which does not require cell detection. The proposed framework firstly partitions images into superpixels, and then extracts multi-scale color-texture features from each superpixel and processes these features using rolling guidance filters, in order to simultaneously reduce inter-class ambiguity and intra-class variation. Finally, a linear support vector machine (SVM) is trained and applied to segment the testing images. A total of 23 hematoxylin-and-eosin-stained histopathological images with pancreatic islets are used for verifying the framework. With an average accuracy of 95%, training time of 20 min and testing time of 1 min per image, the proposed framework outperforms existing approaches with better segmentation performance and lower computational cost. © 2016 International Society for Advancement of Cytometry.
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Affiliation(s)
- Yue Huang
- School of Information Science and Engineering, Xiamen University, Xiamen, China.,Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, 15213, Pennsylvania
| | - Chi Liu
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, 15213, Pennsylvania
| | - John F Eisses
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, 15224, Pennsylvania
| | - Sohail Z Husain
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, 15224, Pennsylvania
| | - Gustavo K Rohde
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, 15213, Pennsylvania. .,Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, 15213, Pennsylvania.
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145
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Lu J, Liu KC, Schulz N, Karampelias C, Charbord J, Hilding A, Rautio L, Bertolino P, Östenson CG, Brismar K, Andersson O. IGFBP1 increases β-cell regeneration by promoting α- to β-cell transdifferentiation. EMBO J 2016; 35:2026-44. [PMID: 27516442 PMCID: PMC5116948 DOI: 10.15252/embj.201592903] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Accepted: 06/27/2016] [Indexed: 01/09/2023] Open
Abstract
There is great interest in therapeutically harnessing endogenous regenerative mechanisms to increase the number of β cells in people with diabetes. By performing whole‐genome expression profiling of zebrafish islets, we identified 11 secreted proteins that are upregulated during β‐cell regeneration. We then tested the proteins' ability to potentiate β‐cell regeneration in zebrafish at supraphysiological levels. One protein, insulin‐like growth factor (Igf) binding‐protein 1 (Igfbp1), potently promoted β‐cell regeneration by potentiating α‐ to β‐cell transdifferentiation. Using various inhibitors and activators of the Igf pathway, we show that Igfbp1 exerts its regenerative effect, at least partly, by inhibiting Igf signaling. Igfbp1's effect on transdifferentiation appears conserved across species: Treating mouse and human islets with recombinant IGFBP1 in vitro increased the number of cells co‐expressing insulin and glucagon threefold. Moreover, a prospective human study showed that having high IGFBP1 levels reduces the risk of developing type‐2 diabetes by more than 85%. Thus, we identify IGFBP1 as an endogenous promoter of β‐cell regeneration and highlight its clinical importance in diabetes.
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Affiliation(s)
- Jing Lu
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Ka-Cheuk Liu
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Nadja Schulz
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Christos Karampelias
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Jérémie Charbord
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Agneta Hilding
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden Department of Endocrinology, Metabolism and Diabetes, Karolinska University Hospital, Stockholm, Sweden
| | - Linn Rautio
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Philippe Bertolino
- Centre de Recherche en Cancérologie de Lyon, Inserm U1052, CNRS UMR5286, Université Lyon 1, Lyon, France
| | - Claes-Göran Östenson
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden Department of Endocrinology, Metabolism and Diabetes, Karolinska University Hospital, Stockholm, Sweden
| | - Kerstin Brismar
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden Department of Endocrinology, Metabolism and Diabetes, Karolinska University Hospital, Stockholm, Sweden
| | - Olov Andersson
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
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146
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Saisho Y. Pancreas Volume and Fat Deposition in Diabetes and Normal Physiology: Consideration of the Interplay Between Endocrine and Exocrine Pancreas. Rev Diabet Stud 2016; 13:132-147. [PMID: 28012279 DOI: 10.1900/rds.2016.13.132] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The pancreas is comprised of exocrine and endocrine components. Despite the fact that they are derived from a common origin in utero, these two compartments are often studied individually because of the different roles and functions of the exocrine and endocrine pancreas. Recent studies have shown that not only type 1 diabetes (T1D), but also type 2 diabetes (T2D), is characterized by a deficit in beta-cell mass, suggesting that pathological changes in the pancreas are critical events in the natural history of diabetes. In both patients with T1D and those with T2D, pancreas mass and exocrine function have been reported to be reduced. On the other hand, pancreas volume and pancreatic fat increase with obesity. Increased beta-cell mass with increasing obesity has also been observed in humans, and ectopic fat deposits in the pancreas have been reported to cause beta-cell dysfunction. Moreover, neogenesis and transdifferentiation from the exocrine to the endocrine compartment in the postnatal period are regarded as a source of newly formed beta-cells. These findings suggest that there is important interplay between the endocrine and exocrine pancreas throughout life. This review summarizes the current knowledge on physiological and pathological changes in the exocrine and endocrine pancreas (i.e., beta-cell mass), and discusses the potential mechanisms of the interplay between the two compartments in humans to understand the pathophysiology of diabetes better.
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Affiliation(s)
- Yoshifumi Saisho
- Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
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147
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Roth Flach RJ, Danai LV, DiStefano MT, Kelly M, Menendez LG, Jurczyk A, Sharma RB, Jung DY, Kim JH, Kim JK, Bortell R, Alonso LC, Czech MP. Protein Kinase Mitogen-activated Protein Kinase Kinase Kinase Kinase 4 (MAP4K4) Promotes Obesity-induced Hyperinsulinemia. J Biol Chem 2016; 291:16221-30. [PMID: 27226575 PMCID: PMC4965570 DOI: 10.1074/jbc.m116.718932] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 05/17/2016] [Indexed: 01/01/2023] Open
Abstract
Previous studies revealed a paradox whereby mitogen-activated protein kinase kinase kinase kinase 4 (Map4k4) acted as a negative regulator of insulin sensitivity in chronically obese mice, yet systemic deletion of Map4k4 did not improve glucose tolerance. Here, we report markedly reduced glucose-responsive plasma insulin and C-peptide levels in whole body Map4k4-depleted mice (M4K4 iKO) as well as an impaired first phase of insulin secretion from islets derived from M4K4 iKO mice ex vivo After long-term high fat diet (HFD), M4K4 iKO mice pancreata also displayed reduced β cell mass, fewer proliferating β cells and reduced islet-specific gene mRNA expression compared with controls, although insulin content was normal. Interestingly, the reduced plasma insulin in M4K4 iKO mice exposed to chronic (16 weeks) HFD was not observed in response to acute HFD challenge or short term treatment with the insulin receptor antagonist S961. Furthermore, the improved insulin sensitivity in obese M4K4 iKO mice was abrogated by high exogenous insulin over the course of a euglycemic clamp study, indicating that hypoinsulinemia promotes insulin sensitivity in chronically obese M4K4 iKO mice. These results demonstrate that protein kinase Map4k4 drives obesity-induced hyperinsulinemia and insulin resistance in part by promoting insulin secretion from β cells in mice.
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Affiliation(s)
| | | | | | - Mark Kelly
- Division of Cardiovascular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts 01605
| | | | | | - Rohit B Sharma
- Department of Medicine, Division of Endocrinology, Metabolism and Diabetes, and
| | | | | | - Jason K Kim
- From the Program in Molecular Medicine, Department of Medicine, Division of Endocrinology, Metabolism and Diabetes, and
| | | | - Laura C Alonso
- Department of Medicine, Division of Endocrinology, Metabolism and Diabetes, and
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148
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Acute Exercise Improves Insulin Clearance and Increases the Expression of Insulin-Degrading Enzyme in the Liver and Skeletal Muscle of Swiss Mice. PLoS One 2016; 11:e0160239. [PMID: 27467214 PMCID: PMC4965115 DOI: 10.1371/journal.pone.0160239] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 07/15/2016] [Indexed: 11/19/2022] Open
Abstract
The effects of exercise on insulin clearance and IDE expression are not yet fully elucidated. Here, we have explored the effect of acute exercise on insulin clearance and IDE expression in lean mice. Male Swiss mice were subjected to a single bout of exercise on a speed/angle controlled treadmill for 3-h at approximately 60-70% of maximum oxygen consumption. As expected, acute exercise reduced glycemia and insulinemia, and increased insulin tolerance. The activity of AMPK-ACC, but not of IR-Akt, pathway was increased in the liver and skeletal muscle of trained mice. In an apparent contrast to the reduced insulinemia, glucose-stimulated insulin secretion was increased in isolated islets of these mice. However, insulin clearance was increased after acute exercise and was accompanied by increased expression of the insulin-degrading enzyme (IDE), in the liver and skeletal muscle. Finally, C2C12, but not HEPG2 cells, incubated at different concentrations of 5-aminoimidazole-4-carboxamide-1-β-d-ribofuranoside (AICAR) for 3-h, showed increased expression of IDE. In conclusion, acute exercise increases insulin clearance, probably due to an augmentation of IDE expression in the liver and skeletal muscle. The elevated IDE expression, in the skeletal muscle, seems to be mediated by activation of AMPK-ACC pathway, in response to exercise. We believe that the increase in the IDE expression, comprise a safety measure to maintain glycemia at or close to physiological levels, turning physical exercise more effective and safe.
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149
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Yasuma T, Yano Y, D'Alessandro-Gabazza CN, Toda M, Gil-Bernabe P, Kobayashi T, Nishihama K, Hinneh JA, Mifuji-Moroka R, Roeen Z, Morser J, Cann I, Motoh I, Takei Y, Gabazza EC. Amelioration of Diabetes by Protein S. Diabetes 2016; 65:1940-51. [PMID: 27207541 DOI: 10.2337/db15-1404] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Accepted: 04/04/2016] [Indexed: 11/13/2022]
Abstract
Protein S is an anticoagulant factor that also regulates inflammation and cell apoptosis. The effect of protein S on diabetes and its complications is unknown. This study compared the development of diabetes between wild-type and transgenic mice overexpressing human protein S and the development of diabetic glomerulosclerosis between mice treated with and without human protein S and between wild-type and protein S transgenic mice. Mice overexpressing protein S showed significant improvements in blood glucose level, glucose tolerance, insulin sensitivity, and insulin secretion compared with wild-type counterparts. Exogenous protein S improved insulin sensitivity in adipocytes, skeletal muscle, and liver cell lines in db/db mice compared with controls. Significant inhibition of apoptosis with increased expression of BIRC3 and Bcl-2 and enhanced activation of Akt/PKB was induced by protein S in islet β-cells compared with controls. Diabetic wild-type mice treated with protein S and diabetic protein S transgenic mice developed significantly less severe diabetic glomerulosclerosis than controls. Patients with type 2 diabetes had significantly lower circulating free protein S than healthy control subjects. This study shows that protein S attenuates diabetes by inhibiting apoptosis of β-cells and the development of diabetic nephropathy.
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Affiliation(s)
- Taro Yasuma
- Department of Diabetes, Metabolism and Endocrinology, Mie University Graduate School of Medicine, Edobashi, Japan
| | - Yutaka Yano
- Department of Diabetes, Metabolism and Endocrinology, Mie University Graduate School of Medicine, Edobashi, Japan
| | | | - Masaaki Toda
- Department of Immunology, Mie University Graduate School of Medicine, Edobashi, Japan
| | - Paloma Gil-Bernabe
- Department of Immunology, Mie University Graduate School of Medicine, Edobashi, Japan
| | - Tetsu Kobayashi
- Department of Pulmonary and Critical Care Medicine, Mie University Graduate School of Medicine, Edobashi, Japan
| | - Kota Nishihama
- Department of Diabetes, Metabolism and Endocrinology, Mie University Graduate School of Medicine, Edobashi, Japan
| | - Josephine A Hinneh
- Department of Immunology, Mie University Graduate School of Medicine, Edobashi, Japan
| | - Rumi Mifuji-Moroka
- Department of Gastroenterology and Hepatology, Mie University Graduate School of Medicine, Edobashi, Japan
| | - Ziaurahman Roeen
- Department of Immunology, Mie University Graduate School of Medicine, Edobashi, Japan
| | - John Morser
- Division of Hematology, Stanford School of Medicine, Stanford, CA
| | - Isaac Cann
- Carl R. Woese Institute for Genomic Biology Institute for Genomic Biology and Department of Animal Sciences and Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Iwasa Motoh
- Department of Immunology, Mie University Graduate School of Medicine, Edobashi, Japan Department of Gastroenterology and Hepatology, Mie University Graduate School of Medicine, Edobashi, Japan
| | - Yoshiyuki Takei
- Department of Diabetes, Metabolism and Endocrinology, Mie University Graduate School of Medicine, Edobashi, Japan Department of Pulmonary and Critical Care Medicine, Mie University Graduate School of Medicine, Edobashi, Japan Department of Gastroenterology and Hepatology, Mie University Graduate School of Medicine, Edobashi, Japan
| | - Esteban C Gabazza
- Department of Immunology, Mie University Graduate School of Medicine, Edobashi, Japan
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