101
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Taddeo EP, Stiles L, Sereda S, Ritou E, Wolf DM, Abdullah M, Swanson Z, Wilhelm J, Bellin M, McDonald P, Caradonna K, Neilson A, Liesa M, Shirihai OS. Individual islet respirometry reveals functional diversity within the islet population of mice and human donors. Mol Metab 2018; 16:150-159. [PMID: 30098928 PMCID: PMC6157638 DOI: 10.1016/j.molmet.2018.07.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 06/25/2018] [Accepted: 07/01/2018] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVE Islets from the same pancreas show remarkable variability in glucose sensitivity. While mitochondrial respiration is essential for glucose-stimulated insulin secretion, little is known regarding heterogeneity in mitochondrial function at the individual islet level. This is due in part to a lack of high-throughput and non-invasive methods for detecting single islet function. METHODS We have developed a novel non-invasive, high-throughput methodology capable of assessing mitochondrial respiration in large-sized individual islets using the XF96 analyzer (Agilent Technologies). RESULTS By increasing measurement sensitivity, we have reduced the minimal size of mouse and human islets needed to assess mitochondrial respiration to single large islets of >35,000 μm2 area (∼210 μm diameter). In addition, we have measured heterogeneous glucose-stimulated mitochondrial respiration among individual human and mouse islets from the same pancreas, allowing population analyses of islet mitochondrial function for the first time. CONCLUSIONS We have developed a novel methodology capable of analyzing mitochondrial function in large-sized individual islets. By highlighting islet functional heterogeneity, we hope this methodology can significantly advance islet research.
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Affiliation(s)
- Evan P Taddeo
- Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Center for Health Sciences, 650 Charles E. Young St., Los Angeles, CA 90095, USA
| | - Linsey Stiles
- Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Center for Health Sciences, 650 Charles E. Young St., Los Angeles, CA 90095, USA
| | - Samuel Sereda
- Department of Medicine, Endocrinology, Diabetes, Nutrition and Weight Management Section, Boston University School of Medicine, 650 Albany St., Room 840, Boston, MA 02118, USA
| | - Eleni Ritou
- Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Center for Health Sciences, 650 Charles E. Young St., Los Angeles, CA 90095, USA
| | - Dane M Wolf
- Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Center for Health Sciences, 650 Charles E. Young St., Los Angeles, CA 90095, USA
| | - Muhamad Abdullah
- Department of Surgery and Schulze Diabetes Institute, University of Minnesota School of Medicine, Minneapolis, MN 55455, USA
| | - Zachary Swanson
- Department of Surgery and Schulze Diabetes Institute, University of Minnesota School of Medicine, Minneapolis, MN 55455, USA
| | - Josh Wilhelm
- Department of Surgery and Schulze Diabetes Institute, University of Minnesota School of Medicine, Minneapolis, MN 55455, USA
| | - Melena Bellin
- Department of Pediatrics, Division of Pediatric Endocrinology, University of Minnesota School of Medicine, Minneapolis, MN 55455, USA
| | - Patrick McDonald
- Center for Health Research Innovation, University of Alberta, Edmonton, AB T6G 2E1, Canada
| | | | | | - Marc Liesa
- Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Center for Health Sciences, 650 Charles E. Young St., Los Angeles, CA 90095, USA.
| | - Orian S Shirihai
- Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Center for Health Sciences, 650 Charles E. Young St., Los Angeles, CA 90095, USA; Department of Medicine, Endocrinology, Diabetes, Nutrition and Weight Management Section, Boston University School of Medicine, 650 Albany St., Room 840, Boston, MA 02118, USA.
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102
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Abstract
β cell replacement with either pancreas or islet transplantation has progressed immensely over the last decades with current 1- and 5-year insulin independence rates of approximately 85% and 50%, respectively. Recent advances are largely attributed to improvements in immunosuppressive regimen, donor selection, and surgical technique. However, both strategies are compromised by a scarce donor source. Xenotransplantation offers a potential solution by providing a theoretically unlimited supply of islets, but clinical application has been limited by concerns for a potent immune response against xenogeneic tissue. β cell clusters derived from embryonic or induced pluripotent stem cells represent another promising unlimited source of insulin producing cells, but clinical application is pending further advances in the function of the β cell like clusters. Exciting developments and rapid progress in all areas of β cell replacement prompted a lively debate by members of the young investigator committee of the International Pancreas and Islet Transplant Association at the 15th International Pancreas and Islet Transplant Association Congress in Melbourne and at the 26th international congress of The Transplant Society in Hong Kong. This international group of young investigators debated which modality of β cell replacement would predominate the landscape in 10 years, and their arguments are summarized here.
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103
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Kuwabara R, Iwata H. Bioabsorbable device to prepare subcutaneous pockets for islet transplantation. J Biomed Mater Res B Appl Biomater 2018; 107:1107-1112. [DOI: 10.1002/jbm.b.34203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 06/26/2018] [Accepted: 06/28/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Rei Kuwabara
- Institute for Frontier Life and Medical SciencesKyoto University Kyoto Japan
- Department of Polymer ChemistryGraduate School of Engineering, Kyoto University Kyoto Japan
| | - Hiroo Iwata
- Compass to Healthy Research Complex Program, RIKEN Hyogo Japan
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104
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Kooptiwut S, Kaewin S, Semprasert N, Sujjitjoon J, Junking M, Suksri K, Yenchitsomanus PT. Estradiol Prevents High Glucose-Induced β-cell Apoptosis by Decreased BTG2 Expression. Sci Rep 2018; 8:12256. [PMID: 30115961 PMCID: PMC6095866 DOI: 10.1038/s41598-018-30698-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 08/03/2018] [Indexed: 01/20/2023] Open
Abstract
Hyperglycemia stimulates several pathways to induce pancreatic β-cell apoptosis. In our previous study by mRNA analysis, we demonstrated that B-cell translocation gene 2 (BTG2) expression was up-regulated in INS-1 cells cultured under high glucose conditions, but this effect was reversed by estrogen. In the present study, we demonstrated that BTG2 mRNA and protein expressions in both INS-1 cells and mouse pancreatic islets increased under high glucose conditions compared to those cultured under basal glucose conditions, while in the presence of estrogen, the BTG2 mRNA and protein expressions decreased. SiRNA-BTG2 significantly reduced cell apoptosis, cleaved-caspase 3, and Bax, compared to the siRNA-control in INS-1 cultured under high glucose conditions. We further demonstrated that BTG2 promoter activity was activated under high glucose conditions whereas estrogen significantly reduced it. The effects of estrogen on BTG2 expression were inhibited by estrogen receptor inhibitors. Also, under high glucose conditions, p53 and Bax mRNA and protein expressions increased, but they decreased in the presence of estrogen. Again, the effect of estrogen on p53 and Bax expression was inhibited by estrogen receptor inhibitors. Taken together, this study demonstrates that estrogen reduces pancreatic β-cell apoptosis under high glucose conditions via suppression of BTG2, p53, and Bax expressions.
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Affiliation(s)
- Suwattanee Kooptiwut
- Department of Physiology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand.
| | - Suchada Kaewin
- Department of Physiology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand
| | - Namoiy Semprasert
- Department of Physiology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand
| | - Jatuporn Sujjitjoon
- Division of Molecular Medicine, Research Department, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand
| | - Mutita Junking
- Division of Molecular Medicine, Research Department, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand
| | - Kanchana Suksri
- Department of Physiology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand
| | - Pa-Thai Yenchitsomanus
- Division of Molecular Medicine, Research Department, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand
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105
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Román CL, Maiztegui B, Del Zotto H, Gagliardino JJ, Flores LE. INGAP-PP effects on β-cell mass and function are related to its positive effect on islet angiogenesis and VEGFA production. Mol Cell Endocrinol 2018; 470:269-280. [PMID: 29146554 DOI: 10.1016/j.mce.2017.11.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 11/10/2017] [Accepted: 11/10/2017] [Indexed: 01/09/2023]
Abstract
Our aim was to determine whether islet angiogenesis and VEGFA production/release participate in the mechanism by which INGAP-PP enhances β-cell function and mass. We used two models: a) in vivo (normal rats injected with INGAP-PP for 10 days) and b) in vitro (normal islets cultured for 4 days with INGAP-PP, VEGFA, Rapamycin, and the specific VEGF-Receptor inhibitor, SU5416). INGAP-PP administration enhanced insulin secretion, β-cell mass, islet vascularization, and angiogenesis without affecting glucose homeostasis. Normal islets cultured with INGAP-PP and VEGFA increased insulin and VEGFA secretion while apoptosis decreased. INGAP-PP-induced effects were prevented by both Rapamycin and SU5416. INGAP-PP effects on β-cell mass and function were significantly associated with a positive effect on islet angiogenesis and VEGFA production/release. VEGF-A possibly potentiates INGAP-PP effect through mTORC pathway.
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Affiliation(s)
- Carolina Lisi Román
- CENEXA, Centro de Endocrinología Experimental y Aplicada (UNLP-CONICET La Plata), Facultad de Ciencias Médicas UNLP, 60 y 120 (s/n) 4to piso, 1900 La Plata, Argentina
| | - Bárbara Maiztegui
- CENEXA, Centro de Endocrinología Experimental y Aplicada (UNLP-CONICET La Plata), Facultad de Ciencias Médicas UNLP, 60 y 120 (s/n) 4to piso, 1900 La Plata, Argentina
| | - Héctor Del Zotto
- CENEXA, Centro de Endocrinología Experimental y Aplicada (UNLP-CONICET La Plata), Facultad de Ciencias Médicas UNLP, 60 y 120 (s/n) 4to piso, 1900 La Plata, Argentina
| | - Juan José Gagliardino
- CENEXA, Centro de Endocrinología Experimental y Aplicada (UNLP-CONICET La Plata), Facultad de Ciencias Médicas UNLP, 60 y 120 (s/n) 4to piso, 1900 La Plata, Argentina
| | - Luis Emilio Flores
- CENEXA, Centro de Endocrinología Experimental y Aplicada (UNLP-CONICET La Plata), Facultad de Ciencias Médicas UNLP, 60 y 120 (s/n) 4to piso, 1900 La Plata, Argentina.
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106
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Bottino R, Knoll MF, Knoll CA, Bertera S, Trucco MM. The Future of Islet Transplantation Is Now. Front Med (Lausanne) 2018; 5:202. [PMID: 30057900 PMCID: PMC6053495 DOI: 10.3389/fmed.2018.00202] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 06/25/2018] [Indexed: 12/15/2022] Open
Abstract
Milestones in the history of diabetes therapy include the discovery of insulin and successful methods of beta cell replacement including whole pancreas and islet cell transplantation options. While pancreas transplantation remains the gold standard for patients who have difficulty controlling their symptoms with exogenous insulin, islet allotransplantation is now able to provide similar results with some advantages that make it an attractive potential alternative. The Edmonton Protocol, which incorporated a large dose of islets from multiple donors with steroid-free immunosuppression helped to establish the modern era of islet transplantation almost 20 years ago. While islet allotransplantation is recognized around the world as a powerful clinical therapy for type 1 diabetes it is not yet recognized by the Federal Drug Administration of the United States. Large-scale clinical trials administered by the Clinical Islet Transplantation Consortium have recently demonstrated that the well-regulated manufacture of a human islet product transplanted into patients with difficult to control type 1 diabetes and with a history of severe hyperglycemic episodes can safely and efficaciously maintain glycemic balance and eliminate the most severe complications associated with diabetes. The results of these clinical trials have established a strong basis for licensure of clinical islet allotransplantation in the US. Recognition by the Federal Drug Administration would likely lead to third party reimbursement for islet allotransplantation as a therapeutic option in the United States and would make the treatment available to many more patients. The high costs of rampant diabetes justify the expense of the treatment, which is in-line with the costs of clinical pancreas transplantation. While much enthusiasm and hope is raised toward the development and optimization of stem cell therapy, the islet transplantation community should push toward licensure, if that means broader access of this procedure to patients who may benefit from it. Even as we prepare to take the first steps in that direction, we must acknowledge the new challenges that a shift from the experimental to clinical will bring. Clinical islet allotransplantation in the United States would be a game-changing event in the treatment of type 1 diabetes and also generate enthusiasm for continued research.
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Affiliation(s)
- Rita Bottino
- Institute of Cellular Therapeutics, Allegheny Health Network Research Institute, Allegheny Health Network, Pittsburgh, PA, United States
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA, United States
- College of Medicine, Drexel University, Philadelphia, PA, United States
| | - Michael F. Knoll
- Institute of Cellular Therapeutics, Allegheny Health Network Research Institute, Allegheny Health Network, Pittsburgh, PA, United States
| | - Carmela A. Knoll
- Institute of Cellular Therapeutics, Allegheny Health Network Research Institute, Allegheny Health Network, Pittsburgh, PA, United States
| | - Suzanne Bertera
- Institute of Cellular Therapeutics, Allegheny Health Network Research Institute, Allegheny Health Network, Pittsburgh, PA, United States
| | - Massimo M. Trucco
- Institute of Cellular Therapeutics, Allegheny Health Network Research Institute, Allegheny Health Network, Pittsburgh, PA, United States
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA, United States
- College of Medicine, Drexel University, Philadelphia, PA, United States
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107
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McQuilling JP, Sittadjody S, Pendergraft S, Farney AC, Opara EC. Applications of particulate oxygen-generating substances (POGS) in the bioartificial pancreas. Biomater Sci 2018; 5:2437-2447. [PMID: 29051963 DOI: 10.1039/c7bm00790f] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Type-1 Diabetes (T1D) is a devastating autoimmune disorder which results in the destruction of beta cells within the pancreas. A promising treatment strategy for T1D is the replacement of the lost beta cell mass through implantation of immune-isolated microencapsulated islets referred to as the bioartificial pancreas. The goal of this approach is to restore blood glucose regulation and prevent the long-term comorbidities of T1D without the need for immunosuppressants. A major requirement in the quest to achieve this goal is to address the oxygen needs of islet cells. Islets are highly metabolically active and require a significant amount of oxygen for normal function. During the process of isolation, microencapsulation, and processing prior to transplantation, the islets' oxygen supply is disrupted, and a large amount of islet cells are therefore lost due to extended hypoxia, thus creating a major barrier to clinical success with this treatment. In this work, we have investigated the oxygen generating compounds, sodium percarbonate (SPO) and calcium peroxide (CPO) as potential supplemental oxygen sources for islets during isolation and encapsulation before and immediately after transplantation. First, SPO particles were used as an oxygen source for islets during isolation. Secondly, silicone films containing SPO were used to provide supplemental oxygen to islets for up to 4 days in culture. Finally, CPO was used as an oxygen source for encapsulated cells by co-encapsulating CPO particles with islets in permselective alginate microspheres. These studies provide an important proof of concept for the utilization of these oxygen generating materials to prevent beta cell death caused by hypoxia.
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Affiliation(s)
- John P McQuilling
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, USA.
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108
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Mendes CP, Postal BG, Oliveira GTC, Castro AJG, Frederico MJS, Moraes ALL, Neuenfeldt PD, Nunes RJ, Menegaz D, Silva FRMB. Insulin stimulus‐secretion coupling is triggered by a novel thiazolidinedione/sulfonylurea hybrid in rat pancreatic islets. J Cell Physiol 2018; 234:509-520. [DOI: 10.1002/jcp.26746] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 04/13/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Camila P. Mendes
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
| | - Bárbara G. Postal
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
| | - Geisel T. C. Oliveira
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
- Núcleo de Bioeletricidade Celular (NUBIOCEL), Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
| | - Allisson J. G. Castro
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
| | - Marisa J. S. Frederico
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
| | - Ana L. L. Moraes
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
| | - Patrícia D. Neuenfeldt
- Universidade Federal de Santa Catarina, Departamento de Química, Centro de Ciências Físicas e MatemáticasCampus UniversitárioBairro Trindade, FlorianópolisSanta CatarinaBrazil
| | - Ricardo J. Nunes
- Universidade Federal de Santa Catarina, Departamento de Química, Centro de Ciências Físicas e MatemáticasCampus UniversitárioBairro Trindade, FlorianópolisSanta CatarinaBrazil
| | - Danusa Menegaz
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
- Núcleo de Bioeletricidade Celular (NUBIOCEL), Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
| | - Fátima R. M. B. Silva
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
- Núcleo de Bioeletricidade Celular (NUBIOCEL), Centro de Ciências Biológicas, Universidade Federal de Santa CatarinaCampus UniversitárioTrindade, FlorianópolisSanta CatarinaBrazil
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109
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Castro AJG, Cazarolli LH, da Luz G, Altenhofen D, da Silva HB, de Carvalho FK, Pizzolatti MG, Silva FRMB. Fern-9(11)-ene-2α,3β-diol Action on Insulin Secretion under Hyperglycemic Conditions. Biochemistry 2018; 57:3894-3902. [PMID: 29792023 DOI: 10.1021/acs.biochem.8b00302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The objective of this study was to investigate the effect and the mechanism of action of fernenediol as an insulin secretagogue. Wistar rats were treated with 0.1, 1, and 10 mg/kg fernenediol before inducing hyperglycemia by oral glucose. The glycaemia, insulin, LDH, calcium, and hepatic glycogen were analyzed. Considering the intestine and pancreas as targets for the triterpene action, the duodenum was used to verify the influence of fernenediol on intestinal glycosidases. Additionally, pancreatic islets were used for studies of 14C-deoxyglucose uptake and the influx of 45Ca2+ in hyperglycemic media with/without fernenediol in the presence/absence of an inhibitor/activator of KATP channels, glibenclamide, diazoxide, nifedipine, calcium chelator (BAPTA-AM), and H-89 and ST, the inhibitors of the PKA and PKC enzymes. Fernenediol significantly reduced glycaemia, potentiated glucose-induced insulin secretion, and stimulated liver glycogen deposition in hyperglycemic rats after an in vivo treatment without changing intestinal disaccharidases activities and showing no influence on intestinal glucose absorption. Also, it stimulated the glucose uptake and calcium influx in pancreatic islets. The involvement of voltage-dependent L-type calcium channels and ATP-dependent potassium channels and the release of calcium from intracellular stores are mandatory for the stimulatory effect of fernenediol on calcium influx. Fernenediol did not change PKA and PKC activities or modify calcium levels. This triterpene is a potent antihyperglycemic agent with a strong insulin secretagogue effect on glycogen accumulation as well. As a whole, this compound presents significant perspectives as a future new drug for the treatment of insulin resistance and/or diabetes.
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Affiliation(s)
- Allisson Jhonatan Gomes Castro
- Departamento de Bioquímica, Centro de Ciências Biológicas , Universidade Federal de Santa Catarina , Florianópolis , SC 88040-900 , Brazil
| | | | - Gabrielle da Luz
- Departamento de Bioquímica, Centro de Ciências Biológicas , Universidade Federal de Santa Catarina , Florianópolis , SC 88040-900 , Brazil
| | - Delsi Altenhofen
- Departamento de Bioquímica, Centro de Ciências Biológicas , Universidade Federal de Santa Catarina , Florianópolis , SC 88040-900 , Brazil
| | - Hemily Batista da Silva
- Departamento de Bioquímica, Centro de Ciências Biológicas , Universidade Federal de Santa Catarina , Florianópolis , SC 88040-900 , Brazil
| | - Francieli Kanumfre de Carvalho
- Departamento de Química , Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina , Florianópolis , SC 88040-900 , Brazil
| | - Moacir Geraldo Pizzolatti
- Departamento de Química , Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina , Florianópolis , SC 88040-900 , Brazil
| | - Fátima Regina Mena Barreto Silva
- Departamento de Bioquímica, Centro de Ciências Biológicas , Universidade Federal de Santa Catarina , Florianópolis , SC 88040-900 , Brazil
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110
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Usynin IF, Poteryaeva ON, Russkikh GS, Zubova AV, Boiko KY, Polyakov LM. [Apolipoprotein A-I stimulates secretion of insulin and matrix metalloproteinases by islets of Langerhans]. BIOMEDIT︠S︡INSKAI︠A︡ KHIMII︠A︡ 2018; 64:195-200. [PMID: 29723150 DOI: 10.18097/pbmc20186402195] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The development of type 2 diabetes mellitus (DM2) is accompanied by disturbances in lipid metabolism. These include the increase in serum levels of atherogenic fractions of very low-density (VLDL) and low-density lipoproteins (LDL), total cholesterol, triglycerides and apo B. In contrast, the level of antiatherogenic high density lipoproteins (HDL) and the content of apolipoprotein A-I (apoA-I) decreased. To study the effect of the observed metabolic changes on insulin secretion in vitro, we used the islets of Langerhans isolated from the rat pancreas. It has been found that incubation of the islets in the presence of serum of the obese patients and patients with decompensated DM2 leads to a decrease in insulin secretion by 2.4 and 5.0 times, respectively. On the contrary, the addition of HDL to the incubation medium increased the insulin secretion by 3.4 times. A similar effect was observed in the presence of apoA-I, the main protein component of HDL. In the presence of apoA-I, the extracellular activity of matrix metalloproteinases (MMPs) demonstrated a 10-fold increase. The addition of LDL and VLDL to the islets did not change the secretion of insulin and activity of MMP. Our results testify to the important role of HDL and apoA-I in regulation of the insulin secretion by b-cells and the activity of MMPs in the islets of Langerhans.
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Affiliation(s)
- I F Usynin
- Institute of Biochemistry, Novosibirsk, Russia
| | | | | | - A V Zubova
- Novosibirsk State Medical University, Novosibirsk, Russia
| | - K Yu Boiko
- Novosibirsk State Medical University, Novosibirsk, Russia
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111
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de Fatima Silva F, Ortiz-Silva M, Galia WBDS, Cassolla P, da Silva FG, Graciano MFR, Carpinelli AR, de Souza HM. Effects of metformin on insulin resistance and metabolic disorders in tumor-bearing rats with advanced cachexia. Can J Physiol Pharmacol 2018; 96:498-505. [DOI: 10.1139/cjpp-2017-0171] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Metformin (MET) is widely used in the correction of insulin (INS) resistance and metabolic abnormalities in type 2 diabetes. However, its effect on INS resistance and metabolic disorders associated with cancer cachexia is not established. We investigated the MET effects, isolated or associated with INS, on INS resistance and metabolic changes induced by Walker-256 tumor in rats with advanced cachexia. MET (500 mg·kg−1, oral) and MET + INS (1.0 IU·kg−1, s.c.) were administered for 12 days, starting on the day of tumor cell inoculation. Tumor-bearing rats showed adipose and muscle mass wasting, body mass loss, anorexia, decreased Akt phosphorylation in retroperitoneal and mesenteric adipose tissue, peripheral INS resistance, hypoinsulinemia, reduced INS content and secretion from pancreatic islets, and also inhibition of glycolysis, gluconeogenesis, and glycogenolysis in liver. MET and MET + INS treatments did not prevent these changes. It can be concluded that treatments with MET and MET + INS did not prevent the adipose and muscle mass wasting and body mass loss of tumor-bearing rats possibly by not improving INS resistance. Therefore, MET, used for the treatment of INS resistance in type 2 diabetes, is not effective in improving INS resistance in the advanced stage of cancer cachexia, evidencing that the drug does not have the same beneficial effect in these 2 diseases.
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Affiliation(s)
- Flaviane de Fatima Silva
- Department of Physiological Sciences, State University of Londrina, 86051-990, Londrina, PR, Brazil
| | - Milene Ortiz-Silva
- Department of Physiological Sciences, State University of Londrina, 86051-990, Londrina, PR, Brazil
| | | | - Priscila Cassolla
- Department of Physiological Sciences, State University of Londrina, 86051-990, Londrina, PR, Brazil
| | | | | | - Angelo Rafael Carpinelli
- Department of Physiology and Biophysics, University of São Paulo, 05508-900, São Paulo, SP, Brazil
| | - Helenir Medri de Souza
- Department of Physiological Sciences, State University of Londrina, 86051-990, Londrina, PR, Brazil
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112
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Piovan S, Pavanello A, Peixoto GML, Matiusso CCI, de Moraes AMP, Martins IP, Malta A, Palma-Rigo K, da Silva Franco CC, Milani PG, Dacome AS, da Costa SC, de Freitas Mathias PC, Mareze-Costa CE. Stevia Nonsweetener Fraction Displays an Insulinotropic Effect Involving Neurotransmission in Pancreatic Islets. Int J Endocrinol 2018; 2018:3189879. [PMID: 29853880 PMCID: PMC5949184 DOI: 10.1155/2018/3189879] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 03/26/2018] [Indexed: 12/22/2022] Open
Abstract
Stevia rebaudiana (Bert.) Bertoni besides being a source of noncaloric sweeteners is also an important source of bioactive molecules. Many plant extracts, mostly obtained with ethyl acetate solvent, are rich in polyphenol compounds that present insulinotropic effects. To investigate whether the nonsweetener fraction, which is rich in phenolic compounds isolated from Stevia rebaudiana with the solvent ethyl acetate (EAF), has an insulinotropic effect, including interference at the terminals of the autonomic nervous system of the pancreatic islets of rats. Pancreatic islets were isolated from Wistar rats and incubated with EAF and inhibitory or stimulatory substances of insulin secretion, including cholinergic and adrenergic agonists and antagonists. EAF potentiates glucose-stimulated insulin secretion (GSIS) only in the presence of high glucose and calcium-dependent concentrations. EAF increased muscarinic insulinotropic effects in pancreatic islets, interfering with the muscarinic receptor subfamily M3. Adrenergic inhibitory effects on GSIS were attenuated in the presence of EAF, which interfered with the adrenergic α2 receptor. Results suggest that EAF isolated from stevia leaves is a potential therapy for treating type 2 diabetes mellitus by stimulating insulin secretion only in high glucose concentrations, enhancing parasympathetic signal transduction and inhibiting sympathetic signal transduction in beta cells.
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Affiliation(s)
- Silvano Piovan
- Department of Physiology Sciences, Universidade Estadual de Maringá, Maringá, PR, Brazil
| | - Audrei Pavanello
- Department of Cell Biology and Genetics, Universidade Estadual de Maringá, Maringá, PR, Brazil
| | | | | | | | - Isabela Peixoto Martins
- Department of Cell Biology and Genetics, Universidade Estadual de Maringá, Maringá, PR, Brazil
| | - Ananda Malta
- Department of Cell Biology and Genetics, Universidade Estadual de Maringá, Maringá, PR, Brazil
| | - Kesia Palma-Rigo
- Department of Cell Biology and Genetics, Universidade Estadual de Maringá, Maringá, PR, Brazil
| | | | - Paula Gimenez Milani
- Department of Biochemistry, Universidade Estadual de Maringá, Maringá, PR, Brazil
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113
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Gomes Castro AJ, Cazarolli LH, Bretanha LC, Sulis PM, Rey Padilla DP, Aragón Novoa DM, Dambrós BF, Pizzolatti MG, Mena Barreto Silva FR. The potent insulin secretagogue effect of betulinic acid is mediated by potassium and chloride channels. Arch Biochem Biophys 2018; 648:20-26. [PMID: 29704483 DOI: 10.1016/j.abb.2018.04.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 04/19/2018] [Accepted: 04/21/2018] [Indexed: 12/13/2022]
Abstract
Betulinic acid (BA) has been described as an insulin secretagogue which may explain its potent antihyperglycemic effect; however, the exact role of BA as an insulinogenic agent is not clear. The aim of this study was to investigate the mechanism of BA on calcium influx and static insulin secretion in pancreatic islets isolated from euglycemic rats. We found that BA triggers calcium influx by a mechanism dependent on ATP-dependent potassium channels and L-type voltage-dependent calcium channels. Additionally, the voltage-dependent and calcium-dependent chloride channels are also involved in the mechanism of BA, probably due to an indirect stimulation of calcium entry and increased intracellular calcium. Additionally, the downstream activation of PKC, which is necessary for the effect of BA on calcium influx, is involved in the full stimulatory response of the triterpene. BA stimulated the static secretion of insulin in pancreatic islets, indicating that the abrupt calcium influx may be a key step in its secretagogue effect. As such, BA stimulates insulin secretion through the activation of electrophysiological mechanisms, such as the closure of potassium channels and opening of calcium and chloride channels, inducing cellular depolarization associated with metabolic-biochemical effects, in turn activating PKC and ensuring the secretion of insulin.
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Affiliation(s)
- Allisson Jhonatan Gomes Castro
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Luisa Helena Cazarolli
- Universidade Federal da Fronteira Sul, Campus Universitário Laranjeiras do Sul, Laranjeiras do Sul, PR, Brazil
| | - Lizandra C Bretanha
- Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Paola Miranda Sulis
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Diana Patricia Rey Padilla
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil; Universidad Nacional de Colombia, Departamento de Farmácia, Facultad de Ciencias, Bogotá, Colombia
| | | | - Betina Fernanda Dambrós
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Moacir G Pizzolatti
- Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
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114
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Guruswamy Damodaran R, Poussard A, Côté B, Andersen PL, Vermette P. Insulin secretion kinetics from single islets reveals distinct subpopulations. Biotechnol Prog 2018; 34:1059-1068. [PMID: 29603910 DOI: 10.1002/btpr.2632] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 03/14/2018] [Indexed: 12/12/2022]
Abstract
Type II diabetes progresses with inadequate insulin secretion and prolonged elevated circulating glucose levels. Also, pancreatic islets isolated for transplantation or tissue engineering can be exposed to glucose over extended timeframe. We hypothesized that isolated pancreatic islets can secrete insulin over a prolonged period of time when incubated in glucose solution and that not all islets release insulin in unison. Insulin secretion kinetics was examined and modeled from single mouse islets in response to chronic glucose exposure (2.8-20 mM). Results with single islets were compared to those from pools of islets. Kinetic analysis of 58 single islets over 72 h in response to elevated glucose revealed distinct insulin secretion profiles: slow-, fast-, and constant-rate secretors, with slow-secretors being most prominent (ca., 50%). Variations in the temporal response to glucose therefore exist. During short-term (<4 h) exposure to elevated glucose few islets are responding with sustained insulin release. The model allowed studying the influence of islet size, revealing no clear effect. At high-glucose concentrations, when secretion is normalized to islet volume, the tendency is that smaller islets secrete more insulin. At high-glucose concentrations, insulin secretion from single islets is representative of islet populations, while under low-glucose conditions pooled islets did not behave as single ones. The characterization of insulin secretion over prolonged periods complements studies on insulin secretion performed over short timeframe. Further investigation of these differences in secretion profiles may resolve open-ended questions on pre-diabetic conditions and transplanted islets performance. This study deliberates the importance of size of islets in insulin secretion. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 34:1059-1068, 2018.
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Affiliation(s)
- Rajesh Guruswamy Damodaran
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Dept. of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 boul. de l'Université, Sherbrooke, QC, J1K 2R1, Canada
- Pharmacology Institute of Sherbrooke, Faculté de médecine et des sciences de la santé, 3001 12ième Avenue Nord, Sherbrooke, QC, J1H 5N4, Canada
- Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, QC, J1H 4C4, Canada
| | - Alexandre Poussard
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Dept. of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 boul. de l'Université, Sherbrooke, QC, J1K 2R1, Canada
- Pharmacology Institute of Sherbrooke, Faculté de médecine et des sciences de la santé, 3001 12ième Avenue Nord, Sherbrooke, QC, J1H 5N4, Canada
- Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, QC, J1H 4C4, Canada
| | - Benoît Côté
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Dept. of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 boul. de l'Université, Sherbrooke, QC, J1K 2R1, Canada
| | - Parker L Andersen
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Dept. of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 boul. de l'Université, Sherbrooke, QC, J1K 2R1, Canada
- Pharmacology Institute of Sherbrooke, Faculté de médecine et des sciences de la santé, 3001 12ième Avenue Nord, Sherbrooke, QC, J1H 5N4, Canada
- Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, QC, J1H 4C4, Canada
| | - Patrick Vermette
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Dept. of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 boul. de l'Université, Sherbrooke, QC, J1K 2R1, Canada
- Pharmacology Institute of Sherbrooke, Faculté de médecine et des sciences de la santé, 3001 12ième Avenue Nord, Sherbrooke, QC, J1H 5N4, Canada
- Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, QC, J1H 4C4, Canada
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115
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Mice pancreatic islets protection from oxidative stress induced by single-walled carbon nanotubes through naringin. Hum Exp Toxicol 2018; 37:1268-1281. [DOI: 10.1177/0960327118769704] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The growing use of carbon nanotubes (CNTs) emphasizes the importance of its potential toxic effects on the human health. Previous studies proved that CNTs caused oxidative stress and decreased cell viability. On the other hand, reactive oxygen species (ROS) and oxidative stress impaired β-cell functions and reduced the insulin secretion. However, there is not any study on the effects of CNTs on islets and β-cells. Therefore, the present study aimed to evaluate the effects of single-walled CNTs (SWCNTs) on oxidative stress in islets in addition to the protective effects of naringin (NRG) as an antioxidant . We examined the effects of SWCNTs and naringin on islets by 3,4 3-(4,5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay; measurement of insulin secretion, ROS, and malondialdehyde (MDA); activities of superoxide dismutase (SOD), catalase (CAT), and glutathione (GSH) peroxidase (GSH-Px); and content of GSH and mitochondrial membrane potential (MMP). The MTT assay demonstrated that decreased viability of islets cells was dose-dependent with exposure to SWCNTs. Further studies revealed that SWCNTs decreased insulin secretion and MMP, induced the formation of ROS, increased the level of MDA, and decreased the activities of SOD, GSH-Px, and CAT and content of GSH. Furthermore, the pretreatment of islets with naringin significantly reverted back these changes. These findings revealed that SWCNTs might induce the oxidative stress to pancreatic islets, causing the occurrence of diabetes, and the protective effects of naringin that was mediated by augmentation of the antioxidant defense system of islets. Our research indicated the necessity for further in vivo and in vitro researches on the effects of SWCNTs and naringin on diabetes.
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116
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Abstract
The control of blood glucose levels in diabetes involving devices are critically reviewed, and the role of blood-contacting biomaterial components analyzed. These include mechanical insulin-delivery systems of the closed-loop type that require an electronic glucose sensor and feedback, and open-loop systems that deliver insulin without a sensor and feedback. Whole pancreatic and islet transplantations, islet encapsulation, and the potential role of polymeric sustained drug delivery systems are discussed. The medical and social impacts of diabetes mellitus are of prime public health concern and of even greater magnitude than those of heart disease in the United States. While future advances in device design, miniaturization, and biometrials technology will significantly add to the arsenal of therapeutic alternatives, devices capable of controlling blood glucose levels ought to be viewed as mere interim phases rather than as final goals of the problem.
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Affiliation(s)
- S.D. Bruck
- Biomaterials and Pharmacological Systems Stephen D. Bruck Associates, Inc. Bethesda, Maryland 20014, USA
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117
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Motomura M, Ichihara H, Matsumoto Y. Nano-chemotherapy using cationic liposome that strategically targets the cell membrane potential of pancreatic cancer cells with negative charge. Bioorg Med Chem Lett 2018. [DOI: 10.1016/j.bmcl.2018.03.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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118
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Boss C, Bouche N, De Marchi U. Encapsulated Optically Responsive Cell Systems: Toward Smart Implants in Biomedicine. Adv Healthc Mater 2018; 7:e1701148. [PMID: 29283209 DOI: 10.1002/adhm.201701148] [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: 09/28/2017] [Revised: 11/06/2017] [Indexed: 01/09/2023]
Abstract
Managing increasingly prevalent chronic diseases will require close continuous monitoring of patients. Cell-based biosensors may be used for implantable diagnostic systems to monitor health status. Cells are indeed natural sensors in the body. Functional cellular systems can be maintained in the body for long-term implantation using cell encapsulation technology. By taking advantage of recent progress in miniaturized optoelectronic systems, the genetic engineering of optically responsive cells may be combined with cell encapsulation to generate smart implantable cell-based sensing systems. In biomedical research, cell-based biosensors may be used to study cell signaling, therapeutic effects, and dosing of bioactive molecules in preclinical models. Today, a wide variety of genetically encoded fluorescent sensors have been developed for real-time imaging of living cells. Here, recent developments in genetically encoded sensors, cell encapsulation, and ultrasmall optical systems are highlighted. The integration of these components in a new generation of biosensors is creating innovative smart in vivo cell-based systems, bringing novel perspectives for biomedical research and ultimately allowing unique health monitoring applications.
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Affiliation(s)
- Christophe Boss
- Device EngineeringNestlé Institute of Health Sciences EPFL Innovation Park Lausanne CH‐1015 Switzerland
| | - Nicolas Bouche
- Device EngineeringNestlé Institute of Health Sciences EPFL Innovation Park Lausanne CH‐1015 Switzerland
| | - Umberto De Marchi
- Mitochondrial FunctionNestlé Institute of Health Sciences EPFL Innovation Park Lausanne CH‐1015 Switzerland
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119
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Wang X, Xi W, Qin J, Lv J, Wang Y, Zhang T, Li SJ. Deficiency of voltage-gated proton channel Hv1 attenuates streptozotocin-induced β-cell damage. Biochem Biophys Res Commun 2018; 498:975-980. [DOI: 10.1016/j.bbrc.2018.03.092] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 03/13/2018] [Indexed: 10/17/2022]
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120
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MafB Is Critical for Glucagon Production and Secretion in Mouse Pancreatic α Cells In Vivo. Mol Cell Biol 2018; 38:MCB.00504-17. [PMID: 29378833 DOI: 10.1128/mcb.00504-17] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 01/19/2018] [Indexed: 12/14/2022] Open
Abstract
The MafB transcription factor is expressed in pancreatic α and β cells during development but becomes exclusive to α cells in adult rodents. Mafb-null (Mafb-/- ) mice were reported to have reduced α- and β-cell numbers throughout embryonic development. To further analyze the postnatal function of MafB in the pancreas, we generated endocrine cell-specific (MafbΔEndo ) and tamoxifen-dependent (MafbΔTAM ) Mafb knockout mice. MafbΔEndo mice exhibited reduced populations of insulin-positive (insulin+) and glucagon+ cells at postnatal day 0, but the insulin+ cell population recovered by 8 weeks of age. In contrast, the Arx+ glucagon+ cell fraction and glucagon expression remained decreased even in adulthood. MafbΔTAM mice, with Mafb deleted after pancreas maturation, also demonstrated diminished glucagon+ cells and glucagon content without affecting β cells. A decreased Arx+ glucagon+ cell population in MafbΔEndo mice was compensated for by an increased Arx+ pancreatic polypeptide+ cell population. Furthermore, gene expression analyses from both MafbΔEndo and MafbΔTAM islets revealed that MafB is a key regulator of glucagon expression in α cells. Finally, both mutants failed to respond to arginine, likely due to impaired arginine transporter gene expression and glucagon production ability. Taken together, our findings reveal that MafB is critical for the functional maintenance of mouse α cells in vivo, including glucagon production and secretion, as well as in development.
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121
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Edington CD, Chen WLK, Geishecker E, Kassis T, Soenksen LR, Bhushan BM, Freake D, Kirschner J, Maass C, Tsamandouras N, Valdez J, Cook CD, Parent T, Snyder S, Yu J, Suter E, Shockley M, Velazquez J, Velazquez JJ, Stockdale L, Papps JP, Lee I, Vann N, Gamboa M, LaBarge ME, Zhong Z, Wang X, Boyer LA, Lauffenburger DA, Carrier RL, Communal C, Tannenbaum SR, Stokes CL, Hughes DJ, Rohatgi G, Trumper DL, Cirit M, Griffith LG. Interconnected Microphysiological Systems for Quantitative Biology and Pharmacology Studies. Sci Rep 2018. [PMID: 29540740 PMCID: PMC5852083 DOI: 10.1038/s41598-018-22749-0] [Citation(s) in RCA: 277] [Impact Index Per Article: 46.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Microphysiological systems (MPSs) are in vitro models that capture facets of in vivo organ function through use of specialized culture microenvironments, including 3D matrices and microperfusion. Here, we report an approach to co-culture multiple different MPSs linked together physiologically on re-useable, open-system microfluidic platforms that are compatible with the quantitative study of a range of compounds, including lipophilic drugs. We describe three different platform designs – “4-way”, “7-way”, and “10-way” – each accommodating a mixing chamber and up to 4, 7, or 10 MPSs. Platforms accommodate multiple different MPS flow configurations, each with internal re-circulation to enhance molecular exchange, and feature on-board pneumatically-driven pumps with independently programmable flow rates to provide precise control over both intra- and inter-MPS flow partitioning and drug distribution. We first developed a 4-MPS system, showing accurate prediction of secreted liver protein distribution and 2-week maintenance of phenotypic markers. We then developed 7-MPS and 10-MPS platforms, demonstrating reliable, robust operation and maintenance of MPS phenotypic function for 3 weeks (7-way) and 4 weeks (10-way) of continuous interaction, as well as PK analysis of diclofenac metabolism. This study illustrates several generalizable design and operational principles for implementing multi-MPS “physiome-on-a-chip” approaches in drug discovery.
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Affiliation(s)
- Collin D Edington
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Wen Li Kelly Chen
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Emily Geishecker
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Timothy Kassis
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.,Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Luis R Soenksen
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.,Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Brij M Bhushan
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.,Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | | | - Christian Maass
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Nikolaos Tsamandouras
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jorge Valdez
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Christi D Cook
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.,Center for Gynepathology Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | | | - Jiajie Yu
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Emily Suter
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Michael Shockley
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jason Velazquez
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jeremy J Velazquez
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Linda Stockdale
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Julia P Papps
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.,Center for Gynepathology Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Iris Lee
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Nicholas Vann
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Mario Gamboa
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Matthew E LaBarge
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Zhe Zhong
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Xin Wang
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Laurie A Boyer
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Douglas A Lauffenburger
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.,Center for Gynepathology Research, Massachusetts Institute of Technology, Cambridge, MA, USA.,Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA.,Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Rebecca L Carrier
- Department of Chemical Engineering, Northeastern University, Boston, MA, USA
| | - Catherine Communal
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Steven R Tannenbaum
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.,Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | | | | | - David L Trumper
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA. .,Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Murat Cirit
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA. .,Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Linda G Griffith
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA. .,Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA. .,Center for Gynepathology Research, Massachusetts Institute of Technology, Cambridge, MA, USA. .,Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.
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122
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Prabakaran AD, Karakkat JV, Vijayan R, Chalissery J, Ibrahim MF, Kaimala S, Adeghate EA, Al-Marzouqi AH, Ansari SA, Mensah-Brown E, Emerald BS. Identification of early indicators of altered metabolism in normal development using a rodent model system. Dis Model Mech 2018; 11:dmm.031815. [PMID: 29434026 PMCID: PMC5897726 DOI: 10.1242/dmm.031815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Accepted: 01/15/2018] [Indexed: 11/20/2022] Open
Abstract
Although the existence of a close relationship between the early maternal developmental environment, fetal size at birth and the risk of developing disease in adulthood has been suggested, most studies, however, employed experimentally induced intrauterine growth restriction as a model to link this with later adult disease. Because embryonic size variation also occurs under normal growth and differentiation, elucidating the molecular mechanisms underlying these changes and their relevance to later adult disease risk becomes important. The birth weight of rat pups vary according to the uterine horn positions. Using birth weight as a marker, we compared two groups of rat pups – lower birth weight (LBW, 5th to 25th percentile) and average birth weight (ABW, 50th to 75th percentile) – using morphological, biochemical and molecular biology, and genetic techniques. Our results show that insulin metabolism, Pi3k/Akt and Pparγ signaling and the genes regulating growth and metabolism are significantly different in these groups. Methylation at the promoter of the InsII (Ins2) gene and DNA methyltransferase 1 in LBW pups are both increased. Additionally, the Dnmt1 repressor complex, which includes Hdac1, Rb (Rb1) and E2f1, was also upregulated in LBW pups. We conclude that the Dnmt1 repressor complex, which regulates the restriction point of the cell cycle, retards the rate at which cells traverse the G1 or G0 phase of the cell cycle in LBW pups, thereby slowing down growth. This regulatory mechanism mediated by Dnmt1 might contribute to the production of small-size pups and altered physiology and pathology in adult life. Summary: This study suggests an important link between the early embryonic environment and later adult physiology and pathology. At least one process by which this might be coordinated is through the regulatory mechanisms mediated by Dnmt1.
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Affiliation(s)
- Ashok Daniel Prabakaran
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Jimsheena Valiyakath Karakkat
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Ranjit Vijayan
- Department of Biology, College of Science, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Jisha Chalissery
- Department of Biochemistry, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Marwa F Ibrahim
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Suneesh Kaimala
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Ernest A Adeghate
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Ahmed Hassan Al-Marzouqi
- Department of Biochemistry, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE.,Department of Basic Medical Sciences, College of Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai Healthcare City, PO Box 505055, Dubai, UAE
| | - Suraiya Anjum Ansari
- Department of Biochemistry, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Eric Mensah-Brown
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Bright Starling Emerald
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
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123
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Long-term Functioning of Allogeneic Islets in Subcutaneous Tissue Pretreated With a Novel Cyclic Peptide Without Immunosuppressive Medication. Transplantation 2018; 102:417-425. [DOI: 10.1097/tp.0000000000001923] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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124
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Green AD, Vasu S, Flatt PR. Cellular models for beta-cell function and diabetes gene therapy. Acta Physiol (Oxf) 2018; 222. [PMID: 29226587 DOI: 10.1111/apha.13012] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 11/29/2017] [Accepted: 12/01/2017] [Indexed: 02/06/2023]
Abstract
Diabetes is characterized by the destruction and/or relative dysfunction of insulin-secreting beta-cells in the pancreatic islets of Langerhans. Consequently, considerable effort has been made to understand the physiological processes governing insulin production and secretion in these cells and to elucidate the mechanisms involved in their deterioration in the pathogenesis of diabetes. To date, considerable research has exploited clonal beta-cell lines derived from rodent insulinomas. Such cell lines have proven to be a great asset in diabetes research, in vitro drug testing, and studies of beta-cell physiology and provide a sustainable, and in many cases, more practical alternative to the use of animals or primary tissue. However, selection of the most appropriate rodent beta cell line is often challenging and no single cell line entirely recapitulates the properties of human beta-cells. The generation of stable human beta-cell lines would provide a much more suitable model for studies of human beta-cell physiology and pathology and could potentially be used as a readily available source of implantable insulin-releasing tissue for cell-based therapies of diabetes. In this review, we discuss the history, development, functional characteristics and use of available clonal rodent beta-cell lines, as well as reflecting on recent advances in the generation of human-derived beta-cell lines, their use in research studies and their potential for cell therapy of diabetes.
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Affiliation(s)
- A. D. Green
- SAAD Centre for Pharmacy & Diabetes; School of Biomedical Sciences; University of Ulster; Coleraine UK
| | - S. Vasu
- SAAD Centre for Pharmacy & Diabetes; School of Biomedical Sciences; University of Ulster; Coleraine UK
- Cell Growth and Metabolism Section; Diabetes, Endocrinology, and Obesity Branch; NIDDK; National Institutes of Health; Bethesda MD USA
| | - P. R. Flatt
- SAAD Centre for Pharmacy & Diabetes; School of Biomedical Sciences; University of Ulster; Coleraine UK
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125
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Orłowski T, Sitarek E, Tatarkiewicz K, Sabat M, Antosiak M. Comparison of Two Methods of Pancreas Islets Immunoisolation. Int J Artif Organs 2018. [DOI: 10.1177/039139889702001209] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The efficacy of two methods of Langerhans islets immunoisolation was compared. For this purpose the function of islets encapsulated with alginate/polyethylenimine/protamine/heparin (APPH) or with alginate/poly-L-lisine/alginate (APA) membranes was assessed: in vitro according to their survival and response to glucose challenges, and in vivo according to their capability to provide sufficient insulin delivery to maintain normal fasting blood glucose following xenotransplantation to streptozotocin diabetic mice. In vitro insulin secretion and the response to glucose challenge of APPH and APA encapsulated islets were comparable to free islets. In vivo intraperitoneal concordant xenotransplantation of APA encapsulated rat islets reversed the diabetic state of streptozotocin diabetic mice for a longer period, than APPH islet grafts. This study clearly demonstrated the inadequacy of in vitro methods in the prediction of in vivo results of islets transplantation.
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Affiliation(s)
- T. Orłowski
- Transplantation Institute, Warsaw School of Medicine Warszawa - Poland
| | - E. Sitarek
- Transplantation Institute, Warsaw School of Medicine Warszawa - Poland
| | - K. Tatarkiewicz
- Institute of Biocybernetics and Biomedical Engineering, Warszawa - Poland
| | - M. Sabat
- Transplantation Institute, Warsaw School of Medicine Warszawa - Poland
| | - M. Antosiak
- Institute of Biocybernetics and Biomedical Engineering, Warszawa - Poland
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126
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Effects of long-term nitrate supplementation on carbohydrate metabolism, lipid profiles, oxidative stress, and inflammation in male obese type 2 diabetic rats. Nitric Oxide 2018; 75:27-41. [PMID: 29432804 DOI: 10.1016/j.niox.2018.02.002] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 12/18/2017] [Accepted: 02/08/2018] [Indexed: 12/31/2022]
Abstract
PURPOSE Supplementation with inorganic nitrate to boost the nitrate-nitrite-nitric oxide (NO) pathway, may act as a potential therapeutic agent in diabetes. The aim of this study was to determine the effects of nitrate on carbohydrate metabolism, lipid profiles, oxidative stress, and inflammation in obese type 2 diabetic rats. METHODS Male Wistar rats were divided into 4 groups: Control, control + nitrate, diabetes, and diabetes + nitrate. Diabetes was induced using a high-fat diet and low-dose of streptozotocin. Sodium nitrate (100 mg/L in drinking water) was administered simultaneously for two months. Serum levels of fasting glucose, insulin, and lipid profiles were measured every 2-weeks. Glycated hemoglobin (HbA1c) was measured monthly. Serum thiobarbituric reactive substances (TBARS) level and catalase activity were measured before and after treatment. At the end of the study, glucose, pyruvate, and insulin tolerance tests were done. Glucose-stimulated insulin secretion (GSIS) and insulin content from isolated pancreatic islets were also assessed; mRNA expression of iNOS as well as mRNA expression and protein levels of GLUT4 in insulin-sensitive tissues, and serum IL-1β were determined. RESULTS Nitrate supplementation in diabetic rats significantly improved glucose tolerance, lipid profiles, and catalase activity as well as decreased gluconeogenesis, fasting glucose, insulin, and IL-1β; although it had no significant effect on GSIS, islet insulin content, HbA1c, and serum TBARS. Compared to the controls, in diabetic rats, mRNA expression and protein levels of GLUT4 were significantly lower in the soleus muscle (54% and 34%, respectively) and epididymal adipose tissue (67% and 41%, respectively). In diabetic rats, nitrate administration increased GLUT4 mRNA expression and protein levels in both soleus muscle (215% and 17%, respectively) and epididymal adipose tissue (344% and 22%, respectively). In diabetic rats, nitrate significantly decreased elevated iNOS mRNA expression in both the soleus muscle and epididymal adipose tissue. CONCLUSION Chronic nitrate supplementation in obese type 2 diabetic rats improved glucose tolerance, insulin resistance, and dyslipidemia; these favorable effects were associated with increased mRNA and protein expression of GLUT4 and decreased mRNA expression of iNOS in insulin-sensitive tissues, and with decreased gluconeogenesis, inflammation, and oxidative stress.
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127
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Morita A, Ouchi M, Terada M, Kon H, Kishimoto S, Satoh K, Otani N, Hayashi K, Fujita T, Inoue KI, Anzai N. Reproducible insulin secretion from isolated rat pancreas preparations using an organ bath. Exp Anim 2018; 67:15-22. [PMID: 28757517 PMCID: PMC5814310 DOI: 10.1538/expanim.17-0059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 07/06/2017] [Indexed: 01/10/2023] Open
Abstract
Diabetes mellitus is a lifestyle-related disease that is characterized by inappropriate or diminished insulin secretion. Ex vivo pharmacological studies of hypoglycemic agents are often conducted using perfused pancreatic preparations. Pancreas preparations for organ bath experiments do not require cannulation and are therefore less complex than isolated perfused pancreas preparations. However, previous research has generated almost no data on insulin secretion from pancreas preparations using organ bath preparations. The purpose of this study was to investigate the applicability of isolated rat pancreas preparations using the organ bath technique in the quantitative analysis of insulin secretion from β-cells. We found that insulin secretion significantly declined during incubation in the organ bath, whereas it was maintained in the presence of 1 µM GLP-1. Conversely, amylase secretion exhibited a modest increase during incubation and was not altered in the presence of GLP-1. These results demonstrate that the pancreatic organ bath preparation is a sensitive and reproducible method for the ex vivo assessment of the pharmacological properties of hypoglycemic agents.
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Affiliation(s)
- Asuka Morita
- Department of Pharmacology and Toxicology, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi 321-0293, Japan
| | - Motoshi Ouchi
- Department of Pharmacology and Toxicology, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi 321-0293, Japan
| | - Misao Terada
- Laboratory Animal Research Center, Dokkyo Medical University, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi 321-0293, Japan
| | - Hiroe Kon
- Laboratory Animal Research Center, Dokkyo Medical University, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi 321-0293, Japan
| | - Satoko Kishimoto
- Research Support Center, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi 321-0293, Japan
| | - Keitaro Satoh
- Department of Pharmacology, Asahi University School of Dentistry, 1851-1 Hozumi, Mizuho, Gifu 501-0296, Japan
| | - Naoyuki Otani
- Department of Clinical Pharmacology and Therapeutics, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita 879-5593, Japan
| | - Keitaro Hayashi
- Department of Pharmacology and Toxicology, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi 321-0293, Japan
| | - Tomoe Fujita
- Department of Pharmacology and Toxicology, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi 321-0293, Japan
| | - Ken-Ichi Inoue
- Research Support Center, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi 321-0293, Japan
| | - Naohiko Anzai
- Department of Pharmacology, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan
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128
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O'Harte FPM, Parthsarathy V, Hogg C, Flatt PR. Apelin-13 analogues show potent in vitro and in vivo insulinotropic and glucose lowering actions. Peptides 2018; 100:219-228. [PMID: 29412822 DOI: 10.1016/j.peptides.2017.12.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 12/01/2017] [Accepted: 12/04/2017] [Indexed: 01/08/2023]
Abstract
Nine structurally modified apelin-13 analogues were assessed for their in vitro and acute in vivo antidiabetic potential. Stability was assessed in mouse plasma and insulinotropic efficacy tested in cultured pancreatic BRIN-BD11 cells and isolated mouse pancreatic islets. Intracellular Ca2+ and cAMP production in BRIN-BD11 cells was determined, as was glucose uptake in 3T3-L1 adipocytes. Acute antihyperglycemic effects of apelin analogues were assessed following i.p. glucose tolerance tests (ipGGT, 18 mmol/kg) in normal and diet-induced-obese (DIO) mice and on food intake in normal mice. Apelin analogues all showed enhanced in vitro stability (up to 5.8-fold, t½ = 12.8 h) in mouse plasma compared to native apelin-13 (t½ = 2.1 h). Compared to glucose controls, stable analogues exhibited enhanced insulinotropic responses from BRIN-BD11 cells (up to 4.7-fold, p < 0.001) and isolated mouse islets (up to 5.3-fold) for 10-7 M apelin-13 amide (versus 7.6-fold for 10-7 M GLP-1). Activation of APJ receptors on BRIN-BD11 cells increased intracellular Ca2+ (up to 3.0-fold, p < 0.001) and cAMP (up to 1.7-fold, p < 0.01). Acute ipGTT showed improved insulinotropic and glucose disposal responses in normal and DIO mice (p < 0.05 and p < 0.01, respectively). Apelin-13 amide and (pGlu)apelin-13 amide were the most effective analogues exhibiting acute, dose-dependent and persistent biological actions. Both analogues stimulated insulin-independent glucose uptake by differentiated adipocytes (2.9-3.3-fold, p < 0.05) and inhibited food intake (26-33%, p < 0.001), up to 180 min in mice, versus saline. In contrast, (Ala13)apelin-13 and (Val13)apelin-13 inhibited insulin secretion, suppressed beta-cell signal transduction and stimulated food intake in mice. Thus, stable analogues of apelin-13 have potential for diabetes/obesity therapy.
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Affiliation(s)
- F P M O'Harte
- The SAAD Centre for Pharmacy & Diabetes, School of Biomedical Sciences, University of Ulster, Coleraine, BT52 1SA, Northern Ireland, UK.
| | - V Parthsarathy
- The SAAD Centre for Pharmacy & Diabetes, School of Biomedical Sciences, University of Ulster, Coleraine, BT52 1SA, Northern Ireland, UK
| | - C Hogg
- The SAAD Centre for Pharmacy & Diabetes, School of Biomedical Sciences, University of Ulster, Coleraine, BT52 1SA, Northern Ireland, UK
| | - P R Flatt
- The SAAD Centre for Pharmacy & Diabetes, School of Biomedical Sciences, University of Ulster, Coleraine, BT52 1SA, Northern Ireland, UK
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129
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Im GB, Bhang SH. Recent research trend in cell and drug delivery system for type 1 diabetes treatment. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2018. [DOI: 10.1007/s40005-017-0380-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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130
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Gu W, Rebsdorf A, Hermansen K, Gregersen S, Jeppesen PB. The Dynamic Effects of Isosteviol on Insulin Secretion and Its Inability to Counteract the Impaired β-Cell Function during Gluco-, Lipo-, and Aminoacidotoxicity: Studies In Vitro. Nutrients 2018; 10:nu10020127. [PMID: 29373526 PMCID: PMC5852703 DOI: 10.3390/nu10020127] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 01/10/2018] [Accepted: 01/24/2018] [Indexed: 12/21/2022] Open
Abstract
Isosteviol (ISV), a diterpene molecule, is an isomer of the backbone structure of a group of substances with proven antidiabetic capabilities. The aim of this study was to investigate if ISV elicits dynamic insulin release from pancreatic islets and concomitantly is able to ameliorate gluco-, lipo-, and aminoacidotoxicity in clonal β-cell line (INS-1E) in relation to cell viability and insulin secretion. Isolated mice islets placed into perifusion chambers were perifused with 3.3 mM and 16.7 mM glucose with/without 10−7 M ISV. INS-1E cells were incubated for 72 h with either 30 mM glucose, 1 mM palmitate or 10 mM leucine with or without 10−7 M ISV. Cell viability was evaluated with a Cytotoxic Fluoro-test and insulin secretion was measured in Krebs-Ringer Buffer at 3.3 mM and 16.7 mM glucose. In the presence of 3.3 mM glucose, 10−7 M ISV did not change basal insulin secretion from perifused islets. However, at a high glucose level of 16.7 mM, 10−7 M ISV elicited a 2.5-fold increase (−ISV: 109.92 ± 18.64 ng/mL vs. +ISV: 280.15 ± 34.97 ng/mL; p < 0.01). After 72 h gluco-, lipo-, or aminoacidotoxicity in INS-1E cells, ISV treatment did not significantly affect cell viability (glucotoxicity, −ISV: 19.23 ± 0.83%, +ISV: 18.41 ± 0.90%; lipotoxicity, −ISV: 70.46 ± 3.15%, +ISV: 65.38 ± 2.81%; aminoacidotoxicity: −ISV: 8.12 ± 0.63%; +ISV: 7.75 ± 0.38%, all nonsignificant). ISV did not improve impaired insulin secretion (glucotoxicity, −ISV: 52.22 ± 2.90 ng/mL, +ISV: 47.24 ± 3.61 ng/mL; lipotoxicity, −ISV: 19.94 ± 4.10 ng/mL, +ISV: 22.12 ± 3.94 ng/mL; aminoacidotoxicity: −ISV: 32.13 ± 1.00 ng/mL; +ISV: 30.61 ± 1.54 ng/mL, all nonsignificant). In conclusion, ISV acutely stimulates insulin secretion at high but not at low glucose concentrations. However, ISV did not counteract cell viability or cell dysfunction during gluco-, lipo-, or aminoacidotoxicity in INS-1E cells.
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Affiliation(s)
- Wenqian Gu
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Tage-Hansens Gade 2, 8000 Aarhus C, Denmark.
| | - Andreas Rebsdorf
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Tage-Hansens Gade 2, 8000 Aarhus C, Denmark.
| | - Kjeld Hermansen
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Tage-Hansens Gade 2, 8000 Aarhus C, Denmark.
| | - Søren Gregersen
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Tage-Hansens Gade 2, 8000 Aarhus C, Denmark.
| | - Per Bendix Jeppesen
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Tage-Hansens Gade 2, 8000 Aarhus C, Denmark.
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131
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Ramzy A, Mojibian M, Kieffer TJ. Insulin-Deficient Mouse β-Cells Do Not Fully Mature but Can Be Remedied Through Insulin Replacement by Islet Transplantation. Endocrinology 2018; 159:83-102. [PMID: 29029025 DOI: 10.1210/en.2017-00263] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Accepted: 09/22/2017] [Indexed: 12/17/2022]
Abstract
Insulin receptor (IR) insufficiency in β-cells leads to impaired insulin secretion and reduced β-cell hyperplasia in response to hyperglycemia. Selective IR deficiency in β-cells in later embryological development may lead to compensatory β-cell hyperplasia. Although these findings suggest insulin signaling on the β-cell is important for β-cell function, they are confounded by loss of signaling by the insulinlike growth factors through the IR. To determine whether insulin itself is necessary for β-cell development and maturation, we performed a characterization of pancreatic islets in mice with deletions of both nonallelic insulin genes (Ins1-/-Ins2-/-). We immunostained neonatal Ins1-/-Ins2-/- and Ins1+/+Ins2+/+ pancreata and performed quantitative polymerase chain reaction on isolated neonatal islets. Insulin-deficient islets had reduced expression of factors normally expressed in maturing β-cells, including muscoloaponeurotic fibrosarcoma oncogene homolog A, homeodomain transcription factor 6.1, and glucose transporter 2. Ins1-/-Ins2-/-β-cells expressed progenitor factors associated with stem cells or dedifferentiated β-cells, including v-myc avian myolocytomatosis viral oncogene lung carcinoma derived and homeobox protein NANOG. We replaced insulin by injection or islet transplantation to keep mice alive into adulthood to determine whether insulin replacement was sufficient for the completed maturation of insulin-deficient β-cells. Short-term insulin glargine (Lantus®) injections partially rescued the β-cell phenotype, whereas long-term replacement of insulin by isogenic islet transplantation supported the formation of more mature β-cells. Our findings suggest that tightly regulated glycemia, insulin species, or other islet factors are necessary for β-cell maturation.
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Affiliation(s)
- Adam Ramzy
- Laboratory of Molecular and Cellular Medicine, Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Majid Mojibian
- Laboratory of Molecular and Cellular Medicine, Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Timothy J Kieffer
- Laboratory of Molecular and Cellular Medicine, Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada
- Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada
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Abstract
In this chapter, we describe the methods used to culture mainly rat pancreatic beta cells. We consider necessary to use this approach to get more information about physiological, biophysical, and molecular biology characteristics of primary beta cells. Most of the literature published has been developed in murine and human beta-cell lines. However, there are many differences between tumoral cell lines and native cells because, in contrast to cell lines, primary cells do not divide. Moreover, cell lines can be in various stages of the cell cycle and thus have a different sensitivity to glucose, compared to primary cells. Finally, for these reasons, cell lines can be heterogeneous, as the primary cells are. The main problem in using primary beta cells is that despite that they are a majority within a culture they appear mixed with other kinds of pancreatic islet cells. If one needs to identify single cells or has an only beta-cell composition, it is necessary to process the sample further. For example, one may obtain an enriched population of beta cells using fluorescence-activated cell sorting or identify single cells with the reverse hemolytic plaque assay. The other problem is that cells change with time in culture, becoming old and losing some characteristics, and so must be used preferentially during the first week. The development of human beta-cell cultures is of importance in medicine because we hope one day to be able to transplant viable beta cells to patients with diabetes mellitus type 1.
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133
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Designing a retrievable and scalable cell encapsulation device for potential treatment of type 1 diabetes. Proc Natl Acad Sci U S A 2017; 115:E263-E272. [PMID: 29279393 DOI: 10.1073/pnas.1708806115] [Citation(s) in RCA: 112] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Cell encapsulation has been shown to hold promise for effective, long-term treatment of type 1 diabetes (T1D). However, challenges remain for its clinical applications. For example, there is an unmet need for an encapsulation system that is capable of delivering sufficient cell mass while still allowing convenient retrieval or replacement. Here, we report a simple cell encapsulation design that is readily scalable and conveniently retrievable. The key to this design was to engineer a highly wettable, Ca2+-releasing nanoporous polymer thread that promoted uniform in situ cross-linking and strong adhesion of a thin layer of alginate hydrogel around the thread. The device provided immunoprotection of rat islets in immunocompetent C57BL/6 mice in a short-term (1-mo) study, similar to neat alginate fibers. However, the mechanical property of the device, critical for handling and retrieval, was much more robust than the neat alginate fibers due to the reinforcement of the central thread. It also had facile mass transfer due to the short diffusion distance. We demonstrated the therapeutic potential of the device through the correction of chemically induced diabetes in C57BL/6 mice using rat islets for 3 mo as well as in immunodeficient SCID-Beige mice using human islets for 4 mo. We further showed, as a proof of concept, the scalability and retrievability in dogs. After 1 mo of implantation in dogs, the device could be rapidly retrieved through a minimally invasive laparoscopic procedure. This encapsulation device may contribute to a cellular therapy for T1D because of its retrievability and scale-up potential.
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134
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Lee M, Kim MJ, Oh J, Piao C, Park YW, Lee DY. Gene delivery to pancreatic islets for effective transplantation in diabetic animal. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.07.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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135
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Estrogen attenuates AGTR1 expression to reduce pancreatic β-cell death from high glucose. Sci Rep 2017; 7:16639. [PMID: 29192236 PMCID: PMC5709427 DOI: 10.1038/s41598-017-15237-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 10/24/2017] [Indexed: 01/09/2023] Open
Abstract
Chronic exposure of pancreatic β-cells to high glucose levels results in β-cell dysfunction and death. These effects can be protected by estrogen. The local pancreatic renin-angiotensin system (RAS) has been shown as a novel pathological pathway of high-glucose-induced cell death. The effect of estrogen on pancreatic RAS is still unknown. This study examines whether estrogen protects against pancreatic β-cell death caused by glucotoxicity via a decrease in the pancreatic β-cell RAS pathway. When INS-1 cells were cultured in a high glucose medium, cell death was significantly higher than when the cells were cultured in a basal glucose medium; similarly, there were also higher levels of AGTR1 and p47ph°x mRNA, and protein expression. Moreover, the addition of 10−8 M 17β-estradiol to INS-1 cells cultured in a high glucose medium markedly reduced cell death, AGTR1 and p47ph°x mRNA levels, and protein expression. Similar results were demonstrated in the pancreatic islets. The presence of 10−8 M 17β-estradiol, losartan, or a combination of both, in a high glucose medium had similar levels of reduction of p47ph°x mRNA and protein expression, compared with those cultured in high glucose. Taken together, estrogen protected pancreatic β-cells from high-glucose-induced cell death by reducing the AGTR1 pathway.
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Pasek RC, Dunn JC, Elsakr JM, Aramandla M, Matta AR, Gannon M. Vascular-derived connective tissue growth factor (Ctgf) is critical for pregnancy-induced β cell hyperplasia in adult mice. Islets 2017; 9:150-158. [PMID: 29111856 PMCID: PMC5710701 DOI: 10.1080/19382014.2017.1356963] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
During pregnancy, maternal β cells undergo compensatory changes including hypertrophy, hyperplasia, and increased glucose-stimulated insulin secretion (GSIS). Failure of these adaptations to occur can result in gestational diabetes mellitus. The secreted protein, Connective tissue growth factor (Ctgf), is critical for normal β cell development and promotes regeneration after partial β cell ablation. During embryogenesis, Ctgf is expressed in pancreatic ducts, vasculature, and β cells. In the adult pancreas, Ctgf is expressed only in the vasculature. Here, we report that pregnant mice with global Ctgf haploinsufficiency (CtgfLacZ/+) have an impairment in maternal β cell proliferation, while β cell proliferation in virgin CtgfLacZ/+ females is unaffected. Additionally, α-cell proliferation, β cell size, and GSIS were unaffected in CtgfLacZ/+ mice, suggesting that vascular-derived Ctgf has a specific role in islet compensation during pregnancy.
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Affiliation(s)
- Raymond C. Pasek
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Jennifer C. Dunn
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Joseph M. Elsakr
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, USA
| | - Mounika Aramandla
- School for Science and Math, Vanderbilt University, Nashville, TN, USA
| | - Anveetha R. Matta
- School for Science and Math, Vanderbilt University, Nashville, TN, USA
| | - Maureen Gannon
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, USA
- Department of Veterans Affairs Tennessee Valley, Nashville, TN, USA
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN, USA
- CONTACT Maureen Gannon Department of Medicine, Division of Diabetes, Endocrinology, and Metabolism, Vanderbilt University Medical Center, 2213 Garland Ave., 7465 MRB IV, Nashville, TN 37232-0475
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Cooper-Capetini V, de Vasconcelos DAA, Martins AR, Hirabara SM, Donato J, Carpinelli AR, Abdulkader F. Zinc Supplementation Improves Glucose Homeostasis in High Fat-Fed Mice by Enhancing Pancreatic β-Cell Function. Nutrients 2017; 9:nu9101150. [PMID: 29053582 PMCID: PMC5691766 DOI: 10.3390/nu9101150] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 09/28/2017] [Accepted: 10/03/2017] [Indexed: 12/11/2022] Open
Abstract
Zinc is an essential component of the insulin granule and it possibly modulates insulin secretion and signaling. Since insulin resistance is a hallmark in the development of type 2 diabetes mellitus, this study aimed at investigating if zinc supplementation is able to improve glucose tolerance and β-cell function in a model of insulin resistance. Male C57BL/6 mice were distributed in four groups according to the diet: normal fat (NF); normal fat supplemented with ZnCl2 (NFZ); high-fat (HF); and, high-fat chow supplemented with ZnCl2 (HFZ). Intraperitoneal glucose (ipGTT) and insulin (ipITT) tolerance, glycemia, insulinemia, HOMA-IR, and HOMA-β were determined after 15 weeks in each diet. Glucose-stimulated insulin secretion (GSIS) was investigated in isolated islets. The insulin effect on glucose uptake, metabolism, and signaling was investigated in soleus muscle. ZnCl2 did not affect body mass or insulin sensitivity as assessed by ipITT, HOMA-IR, muscle glucose metabolism, and Akt and GSK3-β phosphorylation. However, glucose tolerance, HOMA-β, and GSIS were significantly improved by ZnCl2 supplementation. Therefore, ZnCl2 supplementation improves glucose homeostasis in high fat-fed mice by a mechanism that enhances β-cell function, rather than whole-body or muscle insulin sensitivity.
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Affiliation(s)
- Vinícius Cooper-Capetini
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil.
| | | | - Amanda Roque Martins
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil.
| | - Sandro Massao Hirabara
- Institute of Physical Activity Sciences and Sports, Cruzeiro do Sul University, São Paulo 05508-000, Brazil.
| | - José Donato
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil.
| | - Angelo Rafael Carpinelli
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil.
| | - Fernando Abdulkader
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil.
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138
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Pachanski MJ, Kirkland ME, Kosinski DT, Mane J, Cheewatrakoolpong B, Xue J, Szeto D, Forrest G, Miller C, Bunzel M, Plummer CW, Chobanian HR, Miller MW, Souza S, Thomas-Fowlkes BS, Ogawa AM, Weinglass AB, Di Salvo J, Li X, Feng Y, Tatosian DA, Howard AD, Colletti SL, Trujillo ME. GPR40 partial agonists and AgoPAMs: Differentiating effects on glucose and hormonal secretions in the rodent. PLoS One 2017; 12:e0186033. [PMID: 29053717 PMCID: PMC5650142 DOI: 10.1371/journal.pone.0186033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 09/23/2017] [Indexed: 01/14/2023] Open
Abstract
GPR40 agonists are effective antidiabetic agents believed to lower glucose through direct effects on the beta cell to increase glucose stimulated insulin secretion. However, not all GPR40 agonists are the same. Partial agonists lower glucose through direct effects on the pancreas, whereas GPR40 AgoPAMs may incorporate additional therapeutic effects through increases in insulinotrophic incretins secreted by the gut. Here we describe how GPR40 AgoPAMs stimulate both insulin and incretin secretion in vivo over time in diabetic GK rats. We also describe effects of AgoPAMs in vivo to lower glucose and body weight beyond what is seen with partial GPR40 agonists in both the acute and chronic setting. Further comparisons of the glucose lowering profile of AgoPAMs suggest these compounds may possess greater glucose control even in the presence of elevated glucagon secretion, an unexpected feature observed with both acute and chronic treatment with AgoPAMs. Together these studies highlight the complexity of GPR40 pharmacology and the potential additional benefits AgoPAMs may possess above partial agonists for the diabetic patient.
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Affiliation(s)
- Michele J. Pachanski
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Melissa E. Kirkland
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Daniel T. Kosinski
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Joel Mane
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | | | - Jiyan Xue
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Daphne Szeto
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Gail Forrest
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Corin Miller
- Translational Imaging Biomarkers, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Michelle Bunzel
- Translational Imaging Biomarkers, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Christopher W. Plummer
- Department of Medicinal Chemistry, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Harry R. Chobanian
- Department of Medicinal Chemistry, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Michael W. Miller
- Department of Medicinal Chemistry, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Sarah Souza
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | | | - Aimie M. Ogawa
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Adam B. Weinglass
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Jerry Di Salvo
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Xiaoyan Li
- Department of Cardio Metabolic Diseases, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Yue Feng
- Department of Cardio Metabolic Diseases, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Daniel A. Tatosian
- Pharmacokinetics, Pharmacodynamics and Drug Metabolism, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Andrew D. Howard
- Department of Cardio Metabolic Diseases, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Steven L. Colletti
- Department of Medicinal Chemistry, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
| | - Maria E. Trujillo
- In Vivo Pharmacology, Merck & Co., Inc., Kenilworth, New Jersey, United States of America
- * E-mail:
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139
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Espes D, Lau J, Carlsson PO. MECHANISMS IN ENDOCRINOLOGY: Towards the clinical translation of stem cell therapy for type 1 diabetes. Eur J Endocrinol 2017; 177:R159-R168. [PMID: 28487297 DOI: 10.1530/eje-17-0080] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 04/24/2017] [Accepted: 05/08/2017] [Indexed: 01/21/2023]
Abstract
Insulin-producing cells derived from human embryonic stem cells (hESCs) or induced pluripotent stem cells (iPSCs) have for long been a promising, but elusive treatment far from clinical translation into type 1 diabetes therapy. However, the field is now on the verge of moving such insulin-producing cells into clinical trials. Although stem cell therapies provide great opportunities, there are also potential risks such as teratoma formation associated with the treatment. Many considerations are needed on how to proceed with clinical translation, including whether to use hESCs or iPSCs, and whether encapsulation of tissue will be needed. This review aims to give an overview of the current knowledge of stem cell therapy outcomes in animal models of type 1 diabetes and a proposed road map towards the clinical setting with special focus on the potential risks and hurdles which needs to be considered. From a clinical point of view, transplantation of insulin-producing cells derived from stem cells must be performed without immune suppression in order to be an attractive treatment option. Although costly and highly labour intensive, patient-derived iPSCs would be the only solution, if not clinically successful encapsulation or tolerance induction protocols are introduced.
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Affiliation(s)
- Daniel Espes
- Departments of Medical Cell Biology
- Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Joey Lau
- Departments of Medical Cell Biology
| | - Per-Ola Carlsson
- Departments of Medical Cell Biology
- Medical Sciences, Uppsala University, Uppsala, Sweden
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140
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Gao H, Ho E, Balakrishnan M, Yechoor V, Yallampalli C. Decreased insulin secretion in pregnant rats fed a low protein diet. Biol Reprod 2017; 97:627-635. [PMID: 29025046 PMCID: PMC9630396 DOI: 10.1093/biolre/iox100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 07/28/2017] [Accepted: 08/24/2017] [Indexed: 12/07/2023] Open
Abstract
Low protein (LP) diet during pregnancy leads to reduced plasma insulin levels in rodents, but the underlying mechanisms remain unclear. Glucose is the primary insulin secretagogue, and enhanced glucose-stimulated insulin secretion (GSIS) in beta cells contributes to compensation for insulin resistance and maintenance of glucose homeostasis during pregnancy. In this study, we hypothesized that plasma insulin levels in pregnant rats fed LP diet are reduced due to disrupted GSIS of pancreatic islets. We first confirmed reduced plasma insulin levels, then investigated in vivo insulin secretion by glucose tolerance test and ex vivo GSIS of pancreatic islets in the presence of glucose at different doses, and KCl, glibenclamide, and L-arginine. Main findings include (1) plasma insulin levels were unaltered on day 10, but significantly reduced on days 14-22 of pregnancy in rats fed LP diet compared to those of control (CT) rats; (2) insulin sensitivity was unchanged, but glucose intolerance was more severe in pregnant rats fed LP diet; (3) GSIS in pancreatic islets was lower in LP rats compared to CT rats in the presence of glucose, KCl, and glibenclamide, and the response to L-arginine was abolished in LP rats; and (4) the total insulin content in pancreatic islets and expression of Ins2 were reduced in LP rats, but expression of Gcg was unaltered. These studies demonstrate that decreased GSIS in beta cells of LP rats contributes to reduced plasma insulin levels, which may lead to placental and fetal growth restriction and programs hypertension and other metabolic diseases in offspring.
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Affiliation(s)
- Haijun Gao
- Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas, USA
- Texas Children's Hospital, Houston, Texas, USA
| | - Eric Ho
- Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas, USA
- Texas Children's Hospital, Houston, Texas, USA
| | - Meena Balakrishnan
- Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas, USA
- Texas Children's Hospital, Houston, Texas, USA
| | - Vijay Yechoor
- Department of Medicine, Baylor College of Medicine, Houston, Texas, USA
| | - Chandra Yallampalli
- Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas, USA
- Texas Children's Hospital, Houston, Texas, USA
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141
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Kinasiewicz J, Antosiak-Iwanska M, Godlewska E, Sitarek E, Sabat M, Fiedor P, Granicka L. Effect of Over 10-Year Cryopreserved Encapsulated Pancreatic Islets Of Langerhans. EXP CLIN TRANSPLANT 2017; 16:461-465. [PMID: 28847262 DOI: 10.6002/ect.2016.0343] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVES Immunoisolation of pancreatic islets of Langerhans performed by the encapsulation process may be a method to avoid immunosuppressive therapy after transplant. The main problem related to islet transplant is shortage of human pancreata. Resolution of this obstacle may be cryopreservation of encapsulated islets, which enables collection of sufficient numbers of isolated islets required for transplant and long-term storage. Here, we assessed the ability of encapsulated islets to function after long-term banking at low temperature. MATERIALS AND METHODS Islets of Langerhans isolated from rat, pig, and human pancreata were encapsulated within alginate-poly-L-lysine-alginate microcapsules. Cryopreservation was carried out using a controlled method of freezing (Kriomedpol freezer; Kriomedpol, Warsaw, Poland), and samples were stored in liquid nitrogen. After 10 years, the samples were thawed with the rapid method (with 0.75 M of sucrose) and then cultured. RESULTS We observed that microcapsules containing islets maintained their shape and integrity after thawing. During culture, free islets were defragmented into single cells, whereas encapsulated islets were still round in shape and compact. After 1, 4, and 7 days of culture of encapsulated islets, the use of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide tests showed increased mitochondrial activity. After they were thawed, the insulin secretion capacity was comparable with that obtained with fresh islets. CONCLUSIONS Cryopreservation and storage of free and microencapsulated islets were possible for about 10 years, although only encapsulated islets retained viability and secretory properties.
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Affiliation(s)
- Joanna Kinasiewicz
- From the Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
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142
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Bhattacharya S, Khan MM, Ghosh C, Bank S, Maiti S. The role of Dermcidin isoform-2 in the occurrence and severity of Diabetes. Sci Rep 2017; 7:8252. [PMID: 28811499 PMCID: PMC5557962 DOI: 10.1038/s41598-017-07958-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 06/27/2017] [Indexed: 02/07/2023] Open
Abstract
Diabetes is now epidemic worldwide. Several hundred-million peoples are presently suffering from this disease with other secondary-disorders. Stress, hypertension, sedentary life-style, carbohydrate/lipid metabolic-disorders due to genetic or environmental factors attributes to type-1 and/or type-2 diabetes. Present investigation demonstrates that stress-induced protein dermcidin isoform-2 (DCN-2) which appears in the serum of diabetic-patients play a key-role in this disease pathogenesis/severity. DCN-2 suppresses insulin production-release from liver/pancreas. It also increases the insulin-resistance. Stress-induction at the onset/progression of this disease is noticed as the high-level of lipid peroxides/low-level of free-thiols in association with increase of inflammatory-markers c-reactive protein and TNF-α. DCN-2 induced decrease in the synthesis of glucose-activated nitric oxide synthase (GANOS) and lower production of NO in liver has been shown here where NO is demonstrated to lower the expression of glucose trabsporter-4 (GLUT-4) and its translocation on liver membrane surface. This finally impairs glucose transport to organs from the extracellular fluid. Low level of glucose uptake further decreases glucose-induced insulin synthesis. The central role of DCN-2 has been demonstrated in type-1/type-2 diabetic individuals, in rodent hepatocytes and pancreatic-cell, tissue-slices, in-vitro and in-vivo experimental model. It can be concluded that stress-induced decrease in insulin synthesis/function, glucose transport is an interactive consequence of oxidative threats and inflammatory events.
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Affiliation(s)
- Suman Bhattacharya
- Sinha Institute of Medical Science and Technology, West Bengal, India.,PG Department of Biochemistry, Cell and Molecular Therapeutics Laboratory, Oriental Institute of Science and Technology, Midnapore, West Bengal, India
| | - Md Mobidullah Khan
- PG Department of Biochemistry, Cell and Molecular Therapeutics Laboratory, Oriental Institute of Science and Technology, Midnapore, West Bengal, India
| | - Chandradipa Ghosh
- Department of Human Physiology with Community Health, Vidyasagar University, Midnapore, West Bengal, India
| | - Sarbashri Bank
- Sinha Institute of Medical Science and Technology, West Bengal, India.,PG Department of Biochemistry, Cell and Molecular Therapeutics Laboratory, Oriental Institute of Science and Technology, Midnapore, West Bengal, India
| | - Smarajit Maiti
- PG Department of Biochemistry, Cell and Molecular Therapeutics Laboratory, Oriental Institute of Science and Technology, Midnapore, West Bengal, India.
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143
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How stable is repression of disallowed genes in pancreatic islets in response to metabolic stress? PLoS One 2017; 12:e0181651. [PMID: 28792951 PMCID: PMC5549890 DOI: 10.1371/journal.pone.0181651] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 07/05/2017] [Indexed: 12/15/2022] Open
Abstract
The specific phenotype of mature differentiated beta cells not only depends on the specific presence of genes that allow beta cell function but also on the selective absence of housekeeping genes ("disallowed genes") that would interfere with this function. Recent studies have shown that both histone modifications and DNA methylation via the de novo methyltransferase DNMT3A are involved in repression of disallowed genes in neonatal beta cells when these cells acquire their mature phenotype. It is unknown, however, if the environmental influence of advanced age, pregnancy and the metabolic stress of high fat diet or diabetes could alter the repression of disallowed genes in beta cells. In the present study, we show that islet disallowed genes-which are also deeply repressed in FACS-purified beta cells-remain deeply repressed in animals of advanced age and in pregnant females. Moreover, the stability of this repression was correlated with strong and stable histone repression marks that persisted in islets isolated from 2 year old mice and with overall high expression of Dnmt3a in islets. Furthermore, repression of disallowed genes was unaffected by the metabolic stress of high fat diet. However, repression of about half of the disallowed genes was weakened in 16 week-old diabetic db/db mice. In conclusion, we show that the disallowed status of islet genes is stable under physiological challenging conditions (advanced age, pregnancy, high fat diet) but partially lost in islets from diabetic animals.
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144
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Lakey JR, Cavanagh TJ, Zieger MA. A Prospective Comparison of Discontinuous Euroficoll and Eurodextran Gradients for Islet Purification. Cell Transplant 2017; 7:479-87. [PMID: 9786068 DOI: 10.1177/096368979800700507] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Density gradient separation of islets from exocrine tissue is usually performed with Ficoll. However, this reagent adds significantly to the cost of the isolation. The aim of this study was to evaluate the performance of Dextran as a potential low-cost substitute for Ficoll and to evaluate the effects of cold storage of the pancreatic digest prior to purification. Pancreases were procured from mongrel dogs, loaded with collagenase and mechanically dissociated. Washed pancreatic digest was collected and divided into two fractions that were purified using discontinuous gradients on the Cobe 2991 processor using identically prepared EuroFicoll (EF) or EuroDextran (ED) gradients. Alternate groups were suspended in EC and stored on ice, while the other fraction were resuspended in the 1.108-g/mL gradient layer (either EF or ED) and loaded into the COBE. This tissue layer was overlaid with layers of densities 1.096 and 1.037 g/mL and a HBSS cap, and centrifuged for 5 min at 800 × g. Purified islets were collected from the interface between the 1.037 and 1.096 layers and islet recovery, purity, and function were assessed. From a series of eight isolations, 72.9 ± 8.2% (mean ± SEM) of the islets were recovered from the EF purified gradients compared with 62.6 ± 8.3% from ED gradients ( p = NS, paired t-test). Gradients of ED that were run following hypothermic storage of the digest in cold EC solution (stored ED) had reduced islet recovery when compared with islet recovery from gradients prepared in EF(stored EF) (51.6 ± 9.6% for ED stored vs. 72.9 ± 11.9 for EF stored, p < 0.05). Islet recovery from EF gradients was equivalent between the stored and nonstored groups. The purity of preparations from the stored ED gradients was also reduced (71.3 ± 4.3%) when compared with islets that were immediately purified after dissociation (82.5 ± 4.8%, p < 0.05). Static glucose stimulation assay showed equivalence between the islets from ED and EF gradients. The stimulation index (SI) was 9.3 ± 0.9 for EF islets compared with 7.9 ± 1.4 for ED islets for digest purified immediately. However, if the digest was hypothermically stored in EC solution, a decrease in functional viability was observed in both the EF and the ED groups (7.7 ± 1.4 and 5.9 ± 0.8, respectively). Out of five alloxan-induced diabetic nude mice transplanted under the kidney capsule with 2000 islets isolated from the nonstored groups, three remained euglycemic >50 days posttrans-plant with either EF or ED islets. These experiments demonstrate effective recovery of equivalent numbers of canine islets using discontinuous gradients of ED or EF immediately following enzymatic digestion. However, following storage of the digest in cold EC solution results in a reduction in both islet recovery and function when gradients of ED are utilized. © 1998 Elsevier Science Inc.
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Affiliation(s)
- J R Lakey
- Comprehensive Tissue Centre, Department of Surgery, University of Alberta, Edmonton, Canada
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145
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Wang K, Wang X, Han CS, Chen LY, Luo Y. Scaffold-supported Transplantation of Islets in the Epididymal Fat Pad of Diabetic Mice. J Vis Exp 2017. [PMID: 28784962 DOI: 10.3791/54995] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Islet transplantation has been clinically proven to be effective at treating type 1 diabetes. However, the current intrahepatic transplantation strategy may incur acute whole blood reactions and result in poor islet engraftment. Here, we report a robust protocol for the transplantation of islets at the extrahepatic transplantation site-the epididymal fat pad (EFP)-in a diabetic mouse model. A protocol to isolate and purify islets at high yields from C57BL/6J mice is described, as well as a transplantation method performed by seeding islets onto a decellularized scaffold (DCS) and implanting them at the EFP site in syngeneic C57BL/6J mice rendered diabetic by streptozotocin. The DCS graft containing 500 islets reversed the hyperglycemic condition within 10 days, while the free islets without DCS required at least 30 days. The normoglycemia was maintained for up to 3 months until the graft was explanted. In conclusion, DCS enhanced the engraftment of islets into the extrahepatic site of the EFP, which could easily be retrieved and might provide a reproducible and useful platform for investigating the scaffold materials, as well as other transplantation parameters required for a successful islet engraftment.
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Affiliation(s)
- Kai Wang
- Department of Biomedical Engineering, Peking University
| | - Xi Wang
- Department of Biomedical Engineering, Peking University
| | | | | | - Ying Luo
- Department of Biomedical Engineering, Peking University;
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146
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From insulin synthesis to secretion: Alternative splicing of type 2 ryanodine receptor gene is essential for insulin secretion in pancreatic β cells. Int J Biochem Cell Biol 2017; 91:176-183. [PMID: 28736243 DOI: 10.1016/j.biocel.2017.07.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 07/14/2017] [Accepted: 07/15/2017] [Indexed: 11/22/2022]
Abstract
Increases in the intracellular Ca2+ concentration in pancreatic islets, resulting from the Ca2+ mobilization from the intracellular source through the ryanodine receptor, are essential for insulin secretion by glucose. Cyclic ADP-ribose, a potent Ca2+ mobilizing second messenger synthesized from NAD+ by CD38, regulates the opening of ryanodine receptor. A novel ryanodine receptor mRNA (the islet-type ryanodine receptor) was found to be generated from the type 2 ryanodine receptor gene by the alternative splicing of exons 4 and 75. The islet-type ryanodine receptor mRNA is expressed in a variety of tissues such as pancreatic islets, cerebrum, cerebellum, and other neuro-endocrine cells, whereas the authentic type 2 ryanodine receptor mRNA (the heart-type ryanodine receptor) was found to be generated using GG/AG splicing of intron 75 and is expressed in the heart and the blood vessel. The islet-type ryanodine receptor caused a greater increase in the Ca2+ release by caffeine when expressed in HEK293 cells pre-treated with cyclic ADP-ribose, suggesting that the novel ryanodine receptor is an intracellular target for the CD38-cyclic ADP-ribose signal system in mammalian cells and that the tissue-specific alternative splicing of type 2 ryanodine receptor mRNA plays an important role in the functioning of the cyclic ADP-ribose-sensitive Ca2+ release.
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147
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Xu B, Iwata H, Miyamoto M, Balamurugan AN, Murakami Y, Cui W, Imamura M, Inoue K. Functional Comparison of the Single-Layer Agarose Microbeads and the Developed Three-Layer Agarose Microbeads as the Bioartificial Pancreas: An In Vitro Study. Cell Transplant 2017. [DOI: 10.3727/000000001783986567] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
In this study, the insulin secretory characteristics of the microencapsulated hamster islets were studied during long-term culture. The hamster islets were encapsulated as single-layer agarose microbeads or three-layer agarose microbeads with agarose and agarose containing poly(styrene sulfonic acid) (PSSa), respectively. The influence of PSSa on the function of the rat islets microencapsulted in three-layer microbeads was primarily monitored. The aim of this study was to examine the influence of the PSSa on the in vitro function of the islets encapsulated in the agarose/PSSa microbeads compared with single-layer agarose microbeads during long-term culture. The microbeads were cultured for 30 days in medium of Eagle's MEM at 37°C in 5% CO2 and 95% air. The basal insulin secretion into the culture medium was measured daily during the first 12 days and two times per week until 30 days. The microbeads were subjected to static incubation test on the 10th, 20th, and 30th day during culture. The basal insulin secretion level of the agarose/PSSa microbeads was significantly higher than that of single-layer agarose microbeads. The static incubation tests revealed a similar pattern of insulin secretion from both microbeads when they were exposed to high glucose challenge. In the static incubation test, both could significantly increase insulin release to more than 6.61 times (stimulation index) in response to high glucose stimulation and could significantly decrease when glucose concentration returned from high glucose to low glucose on the 10th, 20th, and 30th day of culture. This study demonstrated that the hamster islets enclosed in agarose/PSSa hydrogel not only continuously secreted basal amounts of insulin, but also maintained their response to high glucose stimulation similar to the agarose microbeads. The above results together with those of our previous in vivo study suggest that the three-layer microbeads (agarose/PSSa) are well suitable for xenotransplantation of islets for the clinical application.
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Affiliation(s)
- Baoyou Xu
- First Department of Surgery and Surgical Basic Science, Graduate School of Medicine, Kyoto University, Japan
| | - Hiroo Iwata
- Institute for Frontier Medical Sciences, Kyoto University, Japan
| | - Masaaki Miyamoto
- Institute for Frontier Medical Sciences, Kyoto University, Japan
| | | | | | - Wanxing Cui
- First Department of Surgery and Surgical Basic Science, Graduate School of Medicine, Kyoto University, Japan
| | - Masayuki Imamura
- First Department of Surgery and Surgical Basic Science, Graduate School of Medicine, Kyoto University, Japan
| | - Kazutomo Inoue
- Institute for Frontier Medical Sciences, Kyoto University, Japan
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148
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Zorina TD, Subbotin VM, Bertera S, Alexander AM, Haluszczak C, Styche AJ, Trucco M. Distinct Characteristics and Features of Allogeneic Chimerism in the NOD Mouse Model of Autoimmune Diabetes. Cell Transplant 2017. [DOI: 10.3727/096020198389843] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The adaptation of allogeneic chimerism in treatment of autoimmune diabetes has been shown as a promising approach in numerous studies in both experimental and clinical settings. Establishment of hemopoietic chimerism in NOD mice is the most adequate animal model to study mechanisms involved in the multiple aspects of the curative effects of chimerism in autoimmunity-prone individuals. However, there are some discrepancies in the current literature for parameters and criteria used to characterize chimerism in the NOD model. This study was aimed to standardize the criteria for the different pathological stages of diabetogenesis in chimeric versus unmanipulated NOD mice. We report two well-defined scoring systems and a new Index N for the assessment of the pathological characteristics of diabetogenesis and GVHD in chimeric NOD mice. Also, we have demonstrated that, in the NOD model, recipient conditioning resulting in as low as 1% of chimerism is sufficient to promote engraftment of the BM donor-specific islets of Langerhans.
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Affiliation(s)
- Tatiana D. Zorina
- Division of Immunogenetics, Department of Pediatrics, University of Pittsburgh, School of Medicine, Pittsburgh, PA 15213
| | | | - Suzanne Bertera
- Division of Immunogenetics, Department of Pediatrics, University of Pittsburgh, School of Medicine, Pittsburgh, PA 15213
| | - Angela M. Alexander
- Division of Immunogenetics, Department of Pediatrics, University of Pittsburgh, School of Medicine, Pittsburgh, PA 15213
| | - Catherine Haluszczak
- Division of Immunogenetics, Department of Pediatrics, University of Pittsburgh, School of Medicine, Pittsburgh, PA 15213
| | - Alexis J. Styche
- Division of Immunogenetics, Department of Pediatrics, University of Pittsburgh, School of Medicine, Pittsburgh, PA 15213
| | - Massimo Trucco
- Division of Immunogenetics, Department of Pediatrics, University of Pittsburgh, School of Medicine, Pittsburgh, PA 15213
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149
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Gu Y, Tabata Y, Kawakami Y, Balamurugan AN, Hori H, Nagata N, Satake A, Cui W, Qi M, Misawa Y, Toma M, Miyamoto M, Nozawa M, Inoue K. Development of a New Method to Induce Angiogenesis at Subcutaneous Site of Streptozotocin-Induced Diabetic Rats for Islet Transplantation. Cell Transplant 2017. [DOI: 10.3727/000000001783986693] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The subcutaneous space is a potential site for clinical islet transplantation. Even though there are several advantages, poor blood supply at this site mainly causes failure of islet survival. In this study, angiogenesis was induced in advance at the diabetic rats subcutis for islet transplantation by implanting a polyethylene terephthalate (PET) mesh bag containing gelatin microspheres incorporating basic fibroblast growth factor (bFGF) (MS/bFGF) and a collagen sponge. The bFGF was incorporated into gelatin microspheres for controlled release of bFGF. As controls, a PET mesh bag with or without either collagen sponges or MS/bFGF was implanted at the subcutaneous site of diabetic rats. Macroscopic and microscopic examinations revealed the formation of capillary network in and around the PET mesh bag containing MS/bFGF and collagen sponges 7 days after implantation when compare with other control groups. When tissue hemoglobin level was also measured, a significantly high level of hemoglobin amount was observed compared with that of control groups. When allogeneic islets mixed with 5% agarose were transplanted into the prevascularized rat subcutis, normoglycemia was maintained for more than 40 days, while other control groups were ineffective. This study demonstrated that combination of gelatin microspheres incorporating bFGF and collagen sponges enabled the mesh to induce neovascularization even at the subcutaneous site of streptozotocin-induced diabetic rats, resulting in improved function of islet transplantation.
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Affiliation(s)
- Yuanjun Gu
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yasuhiko Tabata
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yoshiyuki Kawakami
- Department of Surgical Basic Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | | | - Hiroshi Hori
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Natsuki Nagata
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Akira Satake
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Wanxing Cui
- Department of Surgical Basic Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Meirigeng Qi
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yoko Misawa
- Department of Surgical Basic Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Maki Toma
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Masaaki Miyamoto
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Masumi Nozawa
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Kazutomo Inoue
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
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Wang W, Gu Y, Miyamoto M, Hori H, Nagata N, Balamurugan AN, Touma M, Sakurai T, Inoue K. Effect of Basic Fibroblast Growth Factor on Insulin Secretion from Microencapsulated Pancreatic Islets: An In Vitro Study. Cell Transplant 2017. [DOI: 10.3727/000000001783986521] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Microencapsulation of pancreatic islets represents a potentially effective method to prevent graft rejection in allotransplantation or xenotransplantation without the need of immunosuppression. Adequate insulin secretion and glucose responsiveness of microencapsulated pancreatic islets has been regarded as a prerequisite for successful transplantation. The microencapsulated pancreatic islets were respectively cultured in bFGF+ RPMI-1640 medium (bFGF+) or bFGF- RPMI-1640 medium (bFGF-) for 21 days. The functional activities of microencapsulated pancreatic islets were assessed by measuring basal insulin secretion and stimulated insulin release at different time points. The results revealed that microencapsulated pancreatic islets in the presence of bFGF demonstrated an increase in basal insulin secretion. Furthermore, microencapsulated pancreatic islets in the presence of bFGF demonstrated a marked stimulated insulin release and relative stability of stimulation indices (SI). The results in the perifusion study showed that microencapsulated pancreatic islets in the presence of bFGF maintained good glucose responsiveness over the course of culture period as well. These results indicate that bFGF has a beneficial effect on insulin secretion from microencapsulated pancreatic islets during in vitro culture. New strategies for preserving and improving function of microencapsulated pancreatic islets prior to transplantation may be developed by application of growth factors or other factors.
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Affiliation(s)
- Wenjing Wang
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, 606-8507, Japan
| | - Yuanjun Gu
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, 606-8507, Japan
| | - Masaaki Miyamoto
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, 606-8507, Japan
| | - Hiroshi Hori
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, 606-8507, Japan
| | - Natsuki Nagata
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, 606-8507, Japan
| | - A. N. Balamurugan
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, 606-8507, Japan
| | - Maki Touma
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, 606-8507, Japan
| | - Tomonori Sakurai
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, 606-8507, Japan
| | - Kazutomo Inoue
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, 606-8507, Japan
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