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Galipeau M, Jouvet N, Courty E, Vandenbeek R, Khan N, Bouyakdan K, Nian C, Iorio C, Scott D, Faraj M, Oeffinger M, Lynn F, Screaton R, Alquier T, Estall J. The Diabetes-Related Gly482Ser Polymorphism Affects PGC1A Stability and Glucose Metabolism. Can J Diabetes 2022. [DOI: 10.1016/j.jcjd.2022.09.096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Mugabo Y, Zhao C, Tan JJ, Ghosh A, Campbell SA, Fadzeyeva E, Paré F, Pan SS, Galipeau M, Ast J, Broichhagen J, Hodson DJ, Mulvihill EE, Petropoulos S, Lim GE. 14-3-3ζ constrains insulin secretion by regulating mitochondrial function in pancreatic β-cells. JCI Insight 2022; 7:156378. [PMID: 35298439 PMCID: PMC9089799 DOI: 10.1172/jci.insight.156378] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 03/11/2022] [Indexed: 11/17/2022] Open
Abstract
While critical for neurotransmitter synthesis, 14-3-3 proteins are often assumed to have redundant functions due to their ubiquitous expression, but despite this assumption, various 14-3-3 isoforms have been implicated in regulating metabolism. We previously reported contributions of 14-3-3ζ in β cell function, but these studies were performed in tumor-derived MIN6 cells and systemic KO mice. To further characterize the regulatory roles of 14-3-3ζ in β cell function, we generated β cell–specific 14-3-3ζ–KO mice. Although no effects on β cell mass were detected, potentiated glucose-stimulated insulin secretion (GSIS), mitochondrial function, and ATP synthesis were observed. Deletion of 14-3-3ζ also altered the β cell transcriptome, as genes associated with mitochondrial respiration and oxidative phosphorylation were upregulated. Acute 14-3-3 protein inhibition in mouse and human islets recapitulated the enhancements in GSIS and mitochondrial function, suggesting that 14-3-3ζ is the critical isoform in β cells. In dysfunctional db/db islets and human islets from type 2 diabetic donors, expression of Ywhaz/YWHAZ, the gene encoding 14-3-3ζ, was inversely associated with insulin secretion, and pan–14-3-3 protein inhibition led to enhanced GSIS and mitochondrial function. Taken together, this study demonstrates important regulatory functions of 14-3-3ζ in the regulation of β cell function and provides a deeper understanding of how insulin secretion is controlled in β cells.
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Affiliation(s)
- Yves Mugabo
- Department of Medicine, Université de Montréal, Montreal, Canada
| | - Cheng Zhao
- Division of Obstetrics and Gynecology, Department of Clinical Science, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
| | - Ju Jing Tan
- Immunopathology Axis, Centre de Recherche du Centre hospitalier de l'Université de Montréal, Montreal, Canada
| | - Anindya Ghosh
- Department of Medicine, Université de Montréal, Montreal, Canada
| | - Scott A Campbell
- Cardiometabolic Axis, Centre de Recherche du Centre hospitalier de l'Université de Montréal, Montreal, Canada
| | - Evgenia Fadzeyeva
- Energy Substrate Laboratory, University of Ottawa Heart Institute, Ottawa, Canada
| | - Frédéric Paré
- Cardiometabolic Axis, Centre de recherche du CHUM (CRCHUM), Montreal, Canada
| | - Siew Siew Pan
- Department of Medicine, Université de Montréal, Montreal, Canada
| | - Maria Galipeau
- Department of Medicine, Université de Montréal, Montreal, Canada
| | - Julia Ast
- Institute of Metabolism and Systems Research (IMSR), Centre of Membrane Pro, University of Birmingham, Birmingham, United Kingdom
| | - Johannes Broichhagen
- Department of Chemical Biology, Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
| | - David J Hodson
- Institute of Metabolism and Systems Research (IMSR), Centre of Membrane Pro, University of Birmingham, Birmingham, United Kingdom
| | - Erin E Mulvihill
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Canada
| | | | - Gareth E Lim
- Department of Medicine, Université de Montréal, Montreal, Canada
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Dos Santos T, Galipeau M, Schukarucha Gomes A, Greenberg M, Larsen M, Lee D, Maghera J, Mulchandani CM, Patton M, Perera I, Polishevska K, Ramdass S, Shayeganpour K, Vafaeian K, Van Allen K, Wang Y, Weisz T, Estall JL, Mulvihill EE, Screaton RA. Islet Biology during COVID-19: Progress and Perspectives. Can J Diabetes 2021; 46:419-427. [PMID: 35589534 PMCID: PMC8608413 DOI: 10.1016/j.jcjd.2021.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/28/2021] [Accepted: 11/01/2021] [Indexed: 01/08/2023]
Abstract
The coronavirus-2019 (COVID-19) pandemic has had significant impact on research directions and productivity in the past 2 years. Despite these challenges, since 2020, more than 2,500 peer-reviewed articles have been published on pancreatic islet biology. These include updates on the roles of isocitrate dehydrogenase, pyruvate kinase and incretin hormones in insulin secretion, as well as the discovery of inceptor and signalling by circulating RNAs. The year 2020 also brought advancements in in vivo and in vitro models, including a new transgenic mouse for assessing beta-cell proliferation, a “pancreas-on-a-chip” to study glucose-stimulated insulin secretion and successful genetic editing of primary human islet cells. Islet biologists evaluated the functionality of stem-cell–derived islet-like cells coated with semipermeable biomaterials to prevent autoimmune attack, revealing the importance of cell maturation after transplantation. Prompted by observations that COVID-19 symptoms can worsen for people with obesity or diabetes, researchers examined how islets are directly affected by severe acute respiratory syndrome coronavirus 2. Herein, we highlight novel functional insights, technologies and therapeutic approaches that emerged between March 2020 and July 2021, written for both scientific and lay audiences. We also include a response to these advancements from patient stakeholders, to help lend a broader perspective to developments and challenges in islet research.
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Affiliation(s)
- Theodore Dos Santos
- Alberta Diabetes Institute & Department of Pharmacology, Li Ka Shing Centre for Health Research Innovation, University of Alberta, Edmonton, Alberta, Canada
| | - Maria Galipeau
- Department of Molecular Biology, Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada; Institut de recherches cliniques de Montréal, Cardiometabolic Disease Centre, Montréal, Québec, Canada
| | - Amanda Schukarucha Gomes
- Alberta Diabetes Institute & Department of Pharmacology, Li Ka Shing Centre for Health Research Innovation, University of Alberta, Edmonton, Alberta, Canada
| | | | | | - Daniel Lee
- Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, Alberta, Canada
| | - Jasmine Maghera
- Alberta Diabetes Institute & Department of Pharmacology, Li Ka Shing Centre for Health Research Innovation, University of Alberta, Edmonton, Alberta, Canada
| | | | - Megan Patton
- Toronto General Hospital, Toronto, Ontario, Canada
| | - Ineli Perera
- Department of Biology and Institute of Biochemistry, Carleton University, Ottawa, Ontario, Canada
| | - Kateryna Polishevska
- Alberta Diabetes Institute and Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
| | | | - Kasra Shayeganpour
- Alberta Diabetes Institute and Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
| | | | - Kyle Van Allen
- Department of Biology and Institute of Biochemistry, Carleton University, Ottawa, Ontario, Canada
| | - Yufeng Wang
- University Health Network, Institute of Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
| | - Tom Weisz
- Toronto General Hospital, Toronto, Ontario, Canada
| | - Jennifer L Estall
- Department of Molecular Biology, Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada; Institut de recherches cliniques de Montréal, Cardiometabolic Disease Centre, Montréal, Québec, Canada
| | - Erin E Mulvihill
- Energy Substrate Laboratory, University of Ottawa Heart Institute, Ottawa, Ontario, Canada; Department of Biochemistry, Immunology and Microbiology, University of Ottawa, Ottawa, Ontario, Canada
| | - Robert A Screaton
- Sunnybrook Research Institute, Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada.
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Lebel MÈ, Coutelier M, Galipeau M, Kleinman CL, Moon JJ, Melichar HJ. Differential expression of tissue-restricted antigens among mTEC is associated with distinct autoreactive T cell fates. Nat Commun 2020; 11:3734. [PMID: 32709894 PMCID: PMC7381629 DOI: 10.1038/s41467-020-17544-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 07/07/2020] [Indexed: 12/12/2022] Open
Abstract
Medullary thymic epithelial cells (mTEC) contribute to the development of T cell tolerance by expressing and presenting tissue-restricted antigens (TRA), so that developing T cells can assess the self-reactivity of their antigen receptors prior to leaving the thymus. mTEC are a heterogeneous population of cells that differentially express TRA. Whether mTEC subsets induce distinct autoreactive T cell fates remains unclear. Here, we establish bacterial artificial chromosome (BAC)-transgenic mouse lines with biased mTEClo or mTEChi expression of model antigens. The transgenic lines support negative selection of antigen-specific thymocytes depending on antigen dose. However, model antigen expression predominantly by mTEClo supports TCRαβ+ CD8αα intraepithelial lymphocyte development; meanwhile, mTEChi-restricted expression preferentially induces Treg differentiation of antigen-specific cells in these models to impact control of infectious agents and tumor growth. In summary, our data suggest that mTEC subsets may have a function in directing distinct mechanisms of T cell tolerance.
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Affiliation(s)
- Marie-Ève Lebel
- Maisonneuve-Rosemont Hospital Research Center, 5415 Boulevard de l'Assomption, Montreal, QC, H1T 2M4, Canada
- Département de microbiologie, infectiologie et immunologie, Université de Montréal, C.P. 6128, succ. Centre-ville, Montreal, QC, H3C 3J7, Canada
| | - Marie Coutelier
- The Lady Davis Institute for Medical Research, Jewish General Hospital, 3999 Côte Ste-Catherine Road Room E-542, Montreal, QC, H3T 1E2, Canada
- Department of Human Genetics, McGill University, Rm W-315, Strathcona Anatomy & Dentistry Building 3640 rue University, Montreal, QC, H3A 0C7, Canada
| | - Maria Galipeau
- Maisonneuve-Rosemont Hospital Research Center, 5415 Boulevard de l'Assomption, Montreal, QC, H1T 2M4, Canada
| | - Claudia L Kleinman
- The Lady Davis Institute for Medical Research, Jewish General Hospital, 3999 Côte Ste-Catherine Road Room E-542, Montreal, QC, H3T 1E2, Canada
- Department of Human Genetics, McGill University, Rm W-315, Strathcona Anatomy & Dentistry Building 3640 rue University, Montreal, QC, H3A 0C7, Canada
| | - James J Moon
- Center for Immunology and Inflammatory Diseases and Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital and Harvard Medical School, 149 13th Street, Charlestown, MA, 02129, USA
| | - Heather J Melichar
- Maisonneuve-Rosemont Hospital Research Center, 5415 Boulevard de l'Assomption, Montreal, QC, H1T 2M4, Canada.
- Département de médecine, Université de Montréal, C.P. 6128, succ. Centre-ville, Montreal, QC, H3C 3J7, Canada.
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