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Duangjan C, Arpawong TE, Spatola BN, Curran SP. Hepatic WDR23 proteostasis mediates insulin homeostasis by regulating insulin-degrading enzyme capacity. GeroScience 2024; 46:4461-4478. [PMID: 38767782 PMCID: PMC11336002 DOI: 10.1007/s11357-024-01196-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Accepted: 05/08/2024] [Indexed: 05/22/2024] Open
Abstract
Maintaining insulin homeostasis is critical for cellular and organismal metabolism. In the liver, insulin is degraded by the activity of the insulin-degrading enzyme (IDE). Here, we establish a hepatic regulatory axis for IDE through WDR23-proteostasis. Wdr23KO mice have increased IDE expression, reduced circulating insulin, and defective insulin responses. Genetically engineered human cell models lacking WDR23 also increase IDE expression and display dysregulated phosphorylation of insulin signaling cascade proteins, IRS-1, AKT2, MAPK, FoxO, and mTOR, similar to cells treated with insulin, which can be mitigated by chemical inhibition of IDE. Mechanistically, the cytoprotective transcription factor NRF2, a direct target of WDR23-Cul4 proteostasis, mediates the enhanced transcriptional expression of IDE when WDR23 is ablated. Moreover, an analysis of human genetic variation in WDR23 across a large naturally aging human cohort in the US Health and Retirement Study reveals a significant association of WDR23 with altered hemoglobin A1C (HbA1c) levels in older adults, supporting the use of WDR23 as a new molecular determinant of metabolic health in humans.
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Affiliation(s)
- Chatrawee Duangjan
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, 90089, USA
| | - Thalida Em Arpawong
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, 90089, USA
| | - Brett N Spatola
- Dornsife College of Letters, Arts, and Science, University of Southern California, Los Angeles, CA, 90089, USA
| | - Sean P Curran
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, 90089, USA.
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2
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Andres M, Hennuyer N, Zibar K, Bicharel-Leconte M, Duplan I, Enée E, Vallez E, Herledan A, Loyens A, Staels B, Deprez B, van Endert P, Deprez-Poulain R, Lancel S. Insulin-degrading enzyme inhibition increases the unfolded protein response and favours lipid accumulation in the liver. Br J Pharmacol 2024; 181:3610-3626. [PMID: 38812293 DOI: 10.1111/bph.16436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 04/03/2024] [Accepted: 04/25/2024] [Indexed: 05/31/2024] Open
Abstract
BACKGROUND AND PURPOSE Nonalcoholic fatty liver disease refers to liver pathologies, ranging from steatosis to steatohepatitis, with fibrosis ultimately leading to cirrhosis and hepatocellular carcinoma. Although several mechanisms have been suggested, including insulin resistance, oxidative stress, and inflammation, its pathophysiology remains imperfectly understood. Over the last decade, a dysfunctional unfolded protein response (UPR) triggered by endoplasmic reticulum (ER) stress emerged as one of the multiple driving factors. In parallel, growing evidence suggests that insulin-degrading enzyme (IDE), a highly conserved and ubiquitously expressed metallo-endopeptidase originally discovered for its role in insulin decay, may regulate ER stress and UPR. EXPERIMENTAL APPROACH We investigated, by genetic and pharmacological approaches, in vitro and in vivo, whether IDE modulates ER stress-induced UPR and lipid accumulation in the liver. KEY RESULTS We found that IDE-deficient mice display higher hepatic triglyceride content along with higher inositol-requiring enzyme 1 (IRE1) pathway activation. Upon induction of ER stress by tunicamycin or palmitate in vitro or in vivo, pharmacological inhibition of IDE, using its inhibitor BDM44768, mainly exacerbated ER stress-induced IRE1 activation and promoted lipid accumulation in hepatocytes, effects that were abolished by the IRE1 inhibitors 4μ8c and KIRA6. Finally, we identified that IDE knockout promotes lipolysis in adipose tissue and increases hepatic CD36 expression, which may contribute to steatosis. CONCLUSION AND IMPLICATIONS These results unravel a novel role for IDE in the regulation of ER stress and development of hepatic steatosis. These findings pave the way to innovative strategies modulating IDE to treat metabolic diseases.
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Affiliation(s)
- Marine Andres
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - EGID Drugs and Molecules for Living Systems, Lille, France
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France
| | - Nathalie Hennuyer
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France
| | - Khamis Zibar
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France
| | | | - Isabelle Duplan
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France
| | - Emmanuelle Enée
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, Paris, France
| | - Emmanuelle Vallez
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France
| | - Adrien Herledan
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - EGID Drugs and Molecules for Living Systems, Lille, France
| | - Anne Loyens
- Univ. Lille, UMR-S 1172-JPArc Centre de Recherche Jean-Pierre Aubert Neurosciences et Cancer, Lille, France
| | - Bart Staels
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France
| | - Benoit Deprez
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - EGID Drugs and Molecules for Living Systems, Lille, France
| | - Peter van Endert
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, Paris, France
- Service immunologie biologique, AP-HP, Hôpital Universitaire Necker-Enfants Malades, Paris, France
| | - Rebecca Deprez-Poulain
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - EGID Drugs and Molecules for Living Systems, Lille, France
- Institut Universitaire de France (IUF), Paris, France
| | - Steve Lancel
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1167 - RID-AGE - Facteurs de risque et déterminants moléculaires des maladies liées au vieillissement, Lille, France
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3
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Binayi F, Saeidi B, Farahani F, Sadat Izadi M, Eskandari F, Azarkish F, Sahraei M, Ghasemi R, Khodagholi F, Zardooz H. Sustained feeding of a diet high in fat resulted in a decline in the liver's insulin-degrading enzyme levels in association with the induction of oxidative and endoplasmic reticulum stress in adult male rats: Evaluation of 4-phenylbutyric acid. Heliyon 2024; 10:e32804. [PMID: 38975085 PMCID: PMC11226834 DOI: 10.1016/j.heliyon.2024.e32804] [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: 01/17/2024] [Revised: 06/06/2024] [Accepted: 06/10/2024] [Indexed: 07/09/2024] Open
Abstract
The current study explored the impact of high fat diet (HFD) on hepatic oxidative and endoplasmic reticulum (ER) stress and its insulin degrading enzyme (IDE) content with the injection of 4-phenyl butyric acid (4-PBA) in adult male rats. Following the weaning period, male offspring were distributed among six distinct groups. The corresponding diet was used for 20 weeks, subsequently 4-PBA was administered for three consecutive days. Plasma glucose and insulin levels, HOMA-β (homeostasis model assessment of β-cell), hepatic ER and oxidative stress biomarkers and IDE protein content were assessed. Long-term ingestion of HFD (31 % cow butter) induced oxidative and ER stress in the liver tissue. Accordingly, a rise in the malondialdehyde (MDA) content and catalase enzyme activity and a decrease in the glutathione (GSH) content were detected within the liver of the HFD and HFD + DMSO groups. Consumption of this diet elevated the liver expression of binding immunoglobulin protein (BIP) and C/enhancer-binding protein homologous protein (CHOP) levels while reduced its IDE content. The HOMA-β decreased significantly. The injection of the 4-PBA moderated all the induced changes. Findings from this study indicated that prolonged HFD consumption led to a reduction in plasma insulin levels, likely attributed to pancreatic β cell malfunction, as evidenced by a decline in the HOMA-β index. Also, the HFD appears to have triggered oxidative and ER stress in the liver, along with a decrease in its IDE content.
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Affiliation(s)
- Fateme Binayi
- Neurophysiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Behnam Saeidi
- Protein Research Center, Shahid Beheshti University, Tehran, Iran
| | - Fatemeh Farahani
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Mina Sadat Izadi
- Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Farzaneh Eskandari
- Neurophysiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fariba Azarkish
- Neurophysiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Sahraei
- School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Rasoul Ghasemi
- Neurophysiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fariba Khodagholi
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Homeira Zardooz
- Neurophysiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Zhu S, Waeckel-Énée E, Oshima M, Moser A, Bessard MA, Gdoura A, Roger K, Mode N, Lipecka J, Yilmaz A, Bertocci B, Diana J, Saintpierre B, Guerrera IC, Scharfmann R, Francesconi S, Mauvais FX, van Endert P. Islet cell stress induced by insulin-degrading enzyme deficiency promotes regeneration and protection from autoimmune diabetes. iScience 2024; 27:109929. [PMID: 38799566 PMCID: PMC11126816 DOI: 10.1016/j.isci.2024.109929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 03/08/2024] [Accepted: 05/03/2024] [Indexed: 05/29/2024] Open
Abstract
Tuning of protein homeostasis through mobilization of the unfolded protein response (UPR) is key to the capacity of pancreatic beta cells to cope with variable demand for insulin. Here, we asked how insulin-degrading enzyme (IDE) affects beta cell adaptation to metabolic and immune stress. C57BL/6 and autoimmune non-obese diabetic (NOD) mice lacking IDE were exposed to proteotoxic, metabolic, and immune stress. IDE deficiency induced a low-level UPR with islet hypertrophy at the steady state, rapamycin-sensitive beta cell proliferation enhanced by proteotoxic stress, and beta cell decompensation upon high-fat feeding. IDE deficiency also enhanced the UPR triggered by proteotoxic stress in human EndoC-βH1 cells. In Ide-/- NOD mice, islet inflammation specifically induced regenerating islet-derived protein 2, a protein attenuating autoimmune inflammation. These findings establish a role of IDE in islet cell protein homeostasis, demonstrate how its absence induces metabolic decompensation despite beta cell proliferation, and UPR-independent islet regeneration in the presence of inflammation.
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Affiliation(s)
- Shuaishuai Zhu
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, F-75015 Paris, France
| | | | - Masaya Oshima
- Université Paris Cité, CNRS, INSERM, Institut Cochin, F-75014 Paris, France
| | - Anna Moser
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, F-75015 Paris, France
| | - Marie-Andrée Bessard
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, F-75015 Paris, France
| | - Abdelaziz Gdoura
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, F-75015 Paris, France
| | - Kevin Roger
- Université Paris Cité, INSERM, CNRS, Structure Fédérative de Recherche Necker, Proteomics Platform, F-75015 Paris, France
| | - Nina Mode
- Université Paris Cité, CNRS, INSERM, Institut Cochin, F-75014 Paris, France
| | - Joanna Lipecka
- Université Paris Cité, INSERM, CNRS, Structure Fédérative de Recherche Necker, Proteomics Platform, F-75015 Paris, France
| | - Ayse Yilmaz
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, F-75015 Paris, France
| | - Barbara Bertocci
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, F-75015 Paris, France
| | - Julien Diana
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, F-75015 Paris, France
| | | | - Ida Chiara Guerrera
- Université Paris Cité, INSERM, CNRS, Structure Fédérative de Recherche Necker, Proteomics Platform, F-75015 Paris, France
| | - Raphael Scharfmann
- Université Paris Cité, CNRS, INSERM, Institut Cochin, F-75014 Paris, France
| | - Stefania Francesconi
- Genome Dynamics Unit, Institut Pasteur, Centre National de la Recherche Scientifique, UMR3525, F-75015 Paris, France
| | - François-Xavier Mauvais
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, F-75015 Paris, France
- Service de Physiologie – Explorations Fonctionnelles Pédiatriques, AP-HP, Hôpital Universitaire Robert Debré, F-75019 Paris, France
| | - Peter van Endert
- Université Paris Cité, INSERM, CNRS, Institut Necker Enfants Malades, F-75015 Paris, France
- Service Immunologie Biologique, AP-HP, Hôpital Universitaire Necker-Enfants Malades, F-75015 Paris, France
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5
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Sanz-González A, Cózar-Castellano I, Broca C, Sabatier J, Acosta GA, Royo M, Hernándo-Muñoz C, Torroba T, Perdomo G, Merino B. Pharmacological activation of insulin-degrading enzyme improves insulin secretion and glucose tolerance in diet-induced obese mice. Diabetes Obes Metab 2023; 25:3268-3278. [PMID: 37493025 DOI: 10.1111/dom.15225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 07/10/2023] [Accepted: 07/10/2023] [Indexed: 07/27/2023]
Abstract
AIM To investigate the use of synthetic preimplantation factor (sPIF) as a potential therapeutic tool for improving glucose-stimulated insulin secretion (GSIS), glucose tolerance and insulin sensitivity in the setting of diabetes. MATERIALS AND METHODS We used a preclinical murine model of type 2 diabetes (T2D) induced by high-fat diet (HFD) feeding for 12 weeks. Saline or sPIF (1 mg/kg/day) was administered to mice by subcutaneously implanted osmotic mini-pumps for 25 days. Glucose tolerance, circulating insulin and C-peptide levels, and GSIS were assessed. In addition, β-cells (Min-6) were used to test the effects of sPIF on GSIS and insulin-degrading enzyme (IDE) activity in vitro. The effect of sPIF on GSIS was also tested in human islets. RESULTS GSIS was enhanced 2-fold by sPIF in human islets ex vivo. Furthermore, continuous administration of sPIF to HFD mice increased circulating levels of insulin and improved glucose tolerance, independently of hepatic insulin clearance. Of note, islets isolated from mice treated with sPIF exhibited restored β-cell function. Finally, genetic (shRNA-IDE) or pharmacological (6bK) inactivation of IDE in Min-6 abolished sPIF-mediated effects on GSIS, showing that both the protein and its protease activity are required for its action. CONCLUSIONS We conclude that sPIF is a promising secretagogue for the treatment of T2D.
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Affiliation(s)
- Alba Sanz-González
- Unidad de Excelencia Instituto de Biomedicina y Genética Molecular (IBGM), Consejo Superior de Investigaciones Científicas (CSIC) y Universidad de Valladolid (UVa), Valladolid, Spain
| | - Irene Cózar-Castellano
- Unidad de Excelencia Instituto de Biomedicina y Genética Molecular (IBGM), Consejo Superior de Investigaciones Científicas (CSIC) y Universidad de Valladolid (UVa), Valladolid, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Madrid, Spain
| | - Christophe Broca
- Laboratory of Cell Therapy for Diabetes (LTCDPRIMS), IRMB Hop. St Eloi, CHU Montpellier, Montpellier, France
| | - Julia Sabatier
- Laboratory of Cell Therapy for Diabetes (LTCDPRIMS), IRMB Hop. St Eloi, CHU Montpellier, Montpellier, France
| | - Gerardo A Acosta
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBERBBN), Barcelona, Spain
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain
- Department of Organic Chemistry, University of Barcelona, Barcelona, Spain
| | - Miriam Royo
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBERBBN), Barcelona, Spain
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain
| | - Carla Hernándo-Muñoz
- Department of Chemistry, Faculty of Science, University of Burgos, Burgos, Spain
| | - Tomás Torroba
- Department of Chemistry, Faculty of Science, University of Burgos, Burgos, Spain
| | - Germán Perdomo
- Unidad de Excelencia Instituto de Biomedicina y Genética Molecular (IBGM), Consejo Superior de Investigaciones Científicas (CSIC) y Universidad de Valladolid (UVa), Valladolid, Spain
| | - Beatriz Merino
- Unidad de Excelencia Instituto de Biomedicina y Genética Molecular (IBGM), Consejo Superior de Investigaciones Científicas (CSIC) y Universidad de Valladolid (UVa), Valladolid, Spain
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Tundo GR, Grasso G, Persico M, Tkachuk O, Bellia F, Bocedi A, Marini S, Parravano M, Graziani G, Fattorusso C, Sbardella D. The Insulin-Degrading Enzyme from Structure to Allosteric Modulation: New Perspectives for Drug Design. Biomolecules 2023; 13:1492. [PMID: 37892174 PMCID: PMC10604886 DOI: 10.3390/biom13101492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 09/11/2023] [Accepted: 09/17/2023] [Indexed: 10/29/2023] Open
Abstract
The insulin-degrading enzyme (IDE) is a Zn2+ peptidase originally discovered as the main enzyme involved in the degradation of insulin and other amyloidogenic peptides, such as the β-amyloid (Aβ) peptide. Therefore, a role for the IDE in the cure of diabetes and Alzheimer's disease (AD) has been long envisaged. Anyway, its role in degrading amyloidogenic proteins remains not clearly defined and, more recently, novel non-proteolytic functions of the IDE have been proposed. From a structural point of view, the IDE presents an atypical clamshell structure, underscoring unique enigmatic enzymological properties. A better understanding of the structure-function relationship may contribute to solving some existing paradoxes of IDE biology and, in light of its multifunctional activity, might lead to novel therapeutic approaches.
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Affiliation(s)
- Grazia Raffaella Tundo
- Department of Clinical Science and Traslational Medicine, University of Rome Tor Vergata, Via Della Ricerca Scientifica 1, 00133 Rome, Italy; (G.R.T.)
| | - Giuseppe Grasso
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy;
| | - Marco Persico
- Department of Pharmacy, University of Naples “Federico II”, Via D. Montesano 49, 80131 Napoli, Italy; (M.P.); (O.T.)
| | - Oleh Tkachuk
- Department of Pharmacy, University of Naples “Federico II”, Via D. Montesano 49, 80131 Napoli, Italy; (M.P.); (O.T.)
| | - Francesco Bellia
- Institute of Crystallography, CNR, Via Paolo Gaifami 18, 95126 Catania, Italy
| | - Alessio Bocedi
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Stefano Marini
- Department of Clinical Science and Traslational Medicine, University of Rome Tor Vergata, Via Della Ricerca Scientifica 1, 00133 Rome, Italy; (G.R.T.)
| | | | - Grazia Graziani
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy;
| | - Caterina Fattorusso
- Department of Pharmacy, University of Naples “Federico II”, Via D. Montesano 49, 80131 Napoli, Italy; (M.P.); (O.T.)
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Zhu S, Waeckel-Énée E, Moser A, Bessard MA, Roger K, Lipecka J, Yilmaz A, Bertocci B, Diana J, Saintpierre B, Guerrera IC, Francesconi S, Mauvais FX, van Endert P. Pancreatic islet cell stress induced by insulin-degrading enzyme deficiency promotes islet regeneration and protection from autoimmune diabetes. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.07.19.549693. [PMID: 37503145 PMCID: PMC10370150 DOI: 10.1101/2023.07.19.549693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Appropriate tuning of protein homeostasis through mobilization of the unfolded protein response (UPR) is key to the capacity of pancreatic beta cells to cope with highly variable demand for insulin synthesis. An efficient UPR ensures a sufficient beta cell mass and secretory output but can also affect beta cell resilience to autoimmune aggression. The factors regulating protein homeostasis in the face of metabolic and immune challenges are insufficiently understood. We examined beta cell adaptation to stress in mice deficient for insulin-degrading enzyme (IDE), a ubiquitous protease with high affinity for insulin and genetic association with type 2 diabetes. IDE deficiency induced a low-level UPR in both C57BL/6 and autoimmune non-obese diabetic (NOD) mice, associated with rapamycin-sensitive beta cell proliferation strongly enhanced by proteotoxic stress. Moreover, in NOD mice, IDE deficiency protected from spontaneous diabetes and triggered an additional independent pathway, conditional on the presence of islet inflammation but inhibited by proteotoxic stress, highlighted by strong upregulation of regenerating islet-derived protein 2, a protein attenuating autoimmune inflammation. Our findings establish a key role of IDE in islet cell protein homeostasis, identify a link between low-level UPR and proliferation, and reveal an UPR-independent anti-inflammatory islet cell response uncovered in the absence of IDE of potential interest in autoimmune diabetes.
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8
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Phillips IR, Veeravalli S, Khadayate S, Shephard EA. Metabolomic and transcriptomic analyses of Fmo5-/- mice reveal roles for flavin-containing monooxygenase 5 (FMO5) in NRF2-mediated oxidative stress response, unfolded protein response, lipid homeostasis, and carbohydrate and one-carbon metabolism. PLoS One 2023; 18:e0286692. [PMID: 37267233 PMCID: PMC10237457 DOI: 10.1371/journal.pone.0286692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 05/20/2023] [Indexed: 06/04/2023] Open
Abstract
Flavin-containing monooxygenase 5 (FMO5) is a member of the FMO family of proteins, best known for their roles in the detoxification of foreign chemicals and, more recently, in endogenous metabolism. We have previously shown that Fmo5-/- mice display an age-related lean phenotype, with much reduced weight gain from 20 weeks of age. The phenotype is characterized by decreased fat deposition, lower plasma concentrations of glucose, insulin and cholesterol, higher glucose tolerance and insulin sensitivity, and resistance to diet-induced obesity. In the present study we report the use of metabolomic and transcriptomic analyses of livers of Fmo5-/- and wild-type mice to identify factors underlying the lean phenotype of Fmo5-/- mice and gain insights into the function of FMO5. Metabolomics was performed by the Metabolon platform, utilising ultrahigh performance liquid chromatography-tandem mass spectroscopy. Transcriptomics was performed by RNA-Seq and results analysed by DESeq2. Disruption of the Fmo5 gene has wide-ranging effects on the abundance of metabolites and expression of genes in the liver. Metabolites whose concentration differed between Fmo5-/- and wild-type mice include several saturated and monounsaturated fatty acids, complex lipids, amino acids, one-carbon intermediates and ADP-ribose. Among the genes most significantly and/or highly differentially expressed are Apoa4, Cd36, Fitm1, Hspa5, Hyou1, Ide, Me1 and Mme. The results reveal that FMO5 is involved in upregulating the NRF2-mediated oxidative stress response, the unfolded protein response and response to hypoxia and cellular stress, indicating a role for the enzyme in adaptation to oxidative and metabolic stress. FMO5 also plays a role in stimulating a wide range of metabolic pathways and processes, particularly ones involved in lipid homeostasis, the uptake and metabolism of glucose, the generation of cytosolic NADPH, and in one-carbon metabolism. The results predict that FMO5 acts by stimulating the NRF2, XBP1, PPARA and PPARG regulatory pathways, while inhibiting STAT1 and IRF7 pathways.
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Affiliation(s)
- Ian R. Phillips
- Department of Structural and Molecular Biology, University College London, London, United Kingdom
- School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom
| | - Sunil Veeravalli
- Department of Structural and Molecular Biology, University College London, London, United Kingdom
| | - Sanjay Khadayate
- MRC London Institute of Medical Sciences (LMS), London, United Kingdom
| | - Elizabeth A. Shephard
- Department of Structural and Molecular Biology, University College London, London, United Kingdom
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9
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Mohan S, Nair A, Poornima MS, Raghu KG. Vanillic acid mitigates hyperinsulinemia induced ER stress mediated altered calcium homeostasis, MAMs distortion and surplus lipogenesis in HepG2 cells. Chem Biol Interact 2023; 375:110365. [PMID: 36764371 DOI: 10.1016/j.cbi.2023.110365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 10/11/2022] [Accepted: 01/23/2023] [Indexed: 02/10/2023]
Abstract
Hyperinsulinemia (HI) induced insulin resistance (IR) and associated pathologies are the burning and unsolvable issues in diabetes treatment. The cellular, molecular and biochemical events associated with HI are not yet elucidated. Similarly, no focused research on designing therapeutic strategies with natural products for attenuation of HI are seen in literature. Keeping this in mind we planned the present study to evaluate the alterations occurring at ER/Ca2+ homeostasis/mitochondria associated endoplasmic reticulum membranes (MAMs) in HepG2 cells during HI and to evaluate the possible beneficial effect of vanillic acid (VA) to mitigate the complications. An in vitro model of HI was established by treating HepG2 cells with human insulin (1 μM) for 24 h. Then, ER stress, Ca2+ homeostasis, MAMs, IR and hepatic lipogenesis were studied at protein level. Various proteins critical to ER, Ca2+ homeostasis and MAMs such as p-IRE-1α, ATF6, p-PERK, p-eIF2α, CHOP, XBP1, p-CAMKII, InsP3R, SERCA, JNK, GRP78, VDAC, Cyp D, GRP75, MFN2, PTEN and mTORC were studied and found altered significantly causing ER stress, defect in Ca2+ movements and distortion of MAMs. The decreased expression of IRS2 and an unaltered expression of IRS1 confirmed the development of selective insulin resistance in hepatocytes during HI and this was the crucial factor for the progression of the hepatic lipid accumulation. We found simultaneous treatment of VA is beneficial up to a certain extent to protect HepG2 cells from the adverse effect of HI via its antioxidant, antilipogenic, mitochondrial and ER protection properties.
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Affiliation(s)
- Sreelekshmi Mohan
- Biochemistry and Molecular Mechanism Laboratory, Agro-processing and Technology Division, Council of Scientific and Industrial Research (CSIR) - National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, 695019, Kerala, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Anupama Nair
- Biochemistry and Molecular Mechanism Laboratory, Agro-processing and Technology Division, Council of Scientific and Industrial Research (CSIR) - National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, 695019, Kerala, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - M S Poornima
- Biochemistry and Molecular Mechanism Laboratory, Agro-processing and Technology Division, Council of Scientific and Industrial Research (CSIR) - National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, 695019, Kerala, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - K G Raghu
- Biochemistry and Molecular Mechanism Laboratory, Agro-processing and Technology Division, Council of Scientific and Industrial Research (CSIR) - National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, 695019, Kerala, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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10
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Su Q, Huang J, Chen X, Wang Y, Shao M, Yan H, Chen C, Ren H, Zhang F, Ni Y, Jose PA, Zhong J, Yang J. Long-Term High-Fat Diet Decreases Renal Insulin-Degrading Enzyme Expression and Function by Inhibiting the PPARγ Pathway. Mol Nutr Food Res 2023; 67:e2200589. [PMID: 36726048 PMCID: PMC10085830 DOI: 10.1002/mnfr.202200589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 12/29/2022] [Indexed: 02/03/2023]
Abstract
SCOPE Long-term high-fat diet (HFD) causes insulin resistance, which is a primary etiological factor in the development of obesity and type 2 diabetes mellitus. Impaired insulin clearance is not only a consequence but also a cause of insulin resistance. The kidney is a major site of insulin clearance, where the insulin-degrading enzyme (IDE) plays a vital role in the proximal tubule. Thus, the study investigates the role of renal IDE in the regulation of insulin resistance in HFD-induced obese mice. METHODS AND RESULTS Twenty four-weeks of HFD in C57BL/6 mice causes insulin resistance and impaires insulin clearance, accompanied by a decrease in renal IDE expression and activity. Palmitic acid decreases IDE mRNA and protein expressions in HK-2 cells. RNA-Seq analysis found that the PPAR pathway is involved. 24-weeks of HFD decreases renal PPARγ, but not PPARα or PPARβ/δ mRNA expression. The inhibition of IDE expression by palmitic acid is prevented by the PPARγ agonist rosiglitazone. The amount of PPARγ bound to the promoters of IDE is decreased in palmitic acid-treated cells. Rosiglitazone improves insulin clearance and insulin resistance and increases renal IDE expression in HFD fed-mice. CONCLUSION Long-term HFD decreases renal IDE expression and activity, and causes insulin resistance, which involves PPARγ.
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Affiliation(s)
- Qian Su
- Department of Endocrinology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Juan Huang
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Department of Clinical Nutrition, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xi Chen
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Department of Clinical Nutrition, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yijie Wang
- Department of Endocrinology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Muqing Shao
- Department of Endocrinology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Hongjia Yan
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Department of Clinical Nutrition, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Caiyu Chen
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
| | - Hongmei Ren
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
| | - Fuwei Zhang
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Department of Cardiology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yinxing Ni
- Department of Endocrinology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Pedro A. Jose
- Division of Renal Diseases & Hypertension, Department of Medicine and Department of Physiology and Pharmacology, The George Washington University School of Medicine & Health Sciences, Washington, DC, USA
| | - Jian Zhong
- Department of Endocrinology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jian Yang
- Research Center for Metabolic and Cardiovascular Diseases, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Department of Clinical Nutrition, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
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11
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Altered serotonin metabolism in Takeda G protein-coupled receptor 5 knockout mice protects against diet-induced hepatic fibrosis. LIVER RESEARCH 2022. [DOI: 10.1016/j.livres.2022.11.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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12
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New Insights on the Regulation of the Insulin-Degrading Enzyme: Role of microRNAs and RBPs. Cells 2022; 11:cells11162538. [PMID: 36010613 PMCID: PMC9406717 DOI: 10.3390/cells11162538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 08/04/2022] [Accepted: 08/05/2022] [Indexed: 11/16/2022] Open
Abstract
The evident implication of the insulin-degrading enzyme (IDE) in Alzheimer’s disease (AD) and type 2 diabetes mellitus (T2DM), among its capacity to degrade insulin and amyloid-β peptide (Aβ), suggests that IDE could be an essential link in the relation between hyperinsulinemia, insulin resistance and AD. However, little is known about the cellular and molecular regulation of IDE expression, and even less has been explored regarding the post-transcriptional regulation of IDE, although it represents a great molecular target of interest for therapeutic treatments. We recently described that miR-7, a novel candidate for linking AD and T2DM at the molecular level, regulates IDE and other key genes in both pathologies, including some key genes involved in the insulin signaling pathway. Here, we explored whether other miRNAs as well as other post-transcriptional regulators, such as RNA binding proteins (RBP), could potentially participate in the regulation of IDE expression in vitro. Our data showed that in addition to miR-7, miR-125, miR-490 and miR-199 regulate IDE expression at the post-transcriptional level. Moreover, we also found that IDE contains multiple potential binding sites for several RBPs, and a narrow-down prediction analysis led us to speculate on a novel regulation of IDE by RALY and HuD. Taken together, these results demonstrate the novel players controlling IDE expression that could represent potential therapeutical targets to treat several metabolic diseases with a high impact on human health, including AD and T2DM.
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13
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Zhuang L, Li C, Hu X, Yang Q, Pei X, Jin G. High expression of P4HA3 in obesity: a potential therapeutic target for type 2 diabetes. Braz J Med Biol Res 2022; 55:e11741. [PMID: 35976267 PMCID: PMC9377532 DOI: 10.1590/1414-431x2022e11741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 05/19/2022] [Indexed: 11/22/2022] Open
Abstract
The aims of the present study were to evaluate the expression of prolyl 4-hydroxylase subunit alpha 3 (P4HA3) in adipocytes and adipose tissue and to explore its effect on obesity and type 2 diabetes mellitus (T2DM). We initially demonstrated that P4HA3 was significantly upregulated in the subcutaneous adipose tissue of obesity and T2DM patients, and its functional roles in adipocyte differentiation and insulin resistance were investigated using in vitro and in vivo models. The knockdown of P4HA3 inhibited adipocyte differentiation and improved insulin resistance in 3T3-L1 cells. In C57BL/6J db/db mice fed with a high fat diet (HFD), silencing P4HA3 significantly decreased fasting blood glucose and triglycerides (TG) levels, with concomitant decrease of body weight and adipose tissue weight. Further analysis showed that P4HA3 knockdown was correlated with the augmented IRS-1/PI3K/Akt/FoxO1 signaling pathway in the adipose and hepatic tissues of obese mice, which could improve hepatic glucose homeostasis and steatosis of mice. Together, our study suggested that the dysregulation of P4HA3 may contribute to the development of obesity and T2DM.
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Affiliation(s)
- Langen Zhuang
- Department of Endocrinology, The First Affiliated Hospital of
Bengbu Medical College, Bengbu, Anhui, China
| | - Can Li
- Shangyi Health Check-up Centre, Zibo, Shandong, China
| | - Xiaolei Hu
- Department of Endocrinology, The First Affiliated Hospital of
Bengbu Medical College, Bengbu, Anhui, China
| | - Qingqing Yang
- Department of Endocrinology, The First Affiliated Hospital of
Bengbu Medical College, Bengbu, Anhui, China
| | - Xiaoyan Pei
- Department of Endocrinology, The First Affiliated Hospital of
Bengbu Medical College, Bengbu, Anhui, China
| | - Guoxi Jin
- Department of Endocrinology, The First Affiliated Hospital of
Bengbu Medical College, Bengbu, Anhui, China
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14
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Najjar SM, Abdolahipour R, Ghadieh HE, Jahromi MS, Najjar JA, Abuamreh BAM, Zaidi S, Kumarasamy S, Muturi HT. Regulation of Insulin Clearance by Non-Esterified Fatty Acids. Biomedicines 2022; 10:biomedicines10081899. [PMID: 36009446 PMCID: PMC9405499 DOI: 10.3390/biomedicines10081899] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/27/2022] [Accepted: 08/03/2022] [Indexed: 11/16/2022] Open
Abstract
Insulin stores lipid in adipocytes and prevents lipolysis and the release of non-esterified fatty acids (NEFA). Excessive release of NEFA during sustained energy supply and increase in abdominal adiposity trigger systemic insulin resistance, including in the liver, a major site of insulin clearance. This causes a reduction in insulin clearance as a compensatory mechanism to insulin resistance in obesity. On the other hand, reduced insulin clearance in the liver can cause chronic hyperinsulinemia, followed by downregulation of insulin receptor and insulin resistance. Delineating the cause–effect relationship between reduced insulin clearance and insulin resistance has been complicated by the fact that insulin action and clearance are mechanistically linked to insulin binding to its receptors. This review discusses how NEFA mobilization contributes to the reciprocal relationship between insulin resistance and reduced hepatic insulin clearance, and how this may be implicated in the pathogenesis of non-alcoholic fatty liver disease.
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Affiliation(s)
- Sonia M. Najjar
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
- Diabetes Institute, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
- Correspondence: ; Tel.: +1-740-593-2376; Fax: +1-740-593-2320
| | - Raziyeh Abdolahipour
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - Hilda E. Ghadieh
- Department of Biomedical Sciences, Faculty of Medicine and Medical Sciences, University of Balamand, Balamand P.O. Box 100, Lebanon
| | - Marziyeh Salehi Jahromi
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - John A. Najjar
- Department of Internal Medicine, College of Medicine, University of Toledo, Toledo, OH 43606, USA
| | - Basil A. M. Abuamreh
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - Sobia Zaidi
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - Sivarajan Kumarasamy
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
- Diabetes Institute, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - Harrison T. Muturi
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
- Diabetes Institute, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
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15
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Merino B, Casanueva-Álvarez E, Quesada I, González-Casimiro CM, Fernández-Díaz CM, Postigo-Casado T, Leissring MA, Kaestner KH, Perdomo G, Cózar-Castellano I. Insulin-degrading enzyme ablation in mouse pancreatic alpha cells triggers cell proliferation, hyperplasia and glucagon secretion dysregulation. Diabetologia 2022; 65:1375-1389. [PMID: 35652923 PMCID: PMC9283140 DOI: 10.1007/s00125-022-05729-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Accepted: 03/11/2022] [Indexed: 01/01/2023]
Abstract
AIMS/HYPOTHESIS Type 2 diabetes is characterised by hyperglucagonaemia and perturbed function of pancreatic glucagon-secreting alpha cells but the molecular mechanisms contributing to these phenotypes are poorly understood. Insulin-degrading enzyme (IDE) is present within all islet cells, mostly in alpha cells, in both mice and humans. Furthermore, IDE can degrade glucagon as well as insulin, suggesting that IDE may play an important role in alpha cell function in vivo. METHODS We have generated and characterised a novel mouse model with alpha cell-specific deletion of Ide, the A-IDE-KO mouse line. Glucose metabolism and glucagon secretion in vivo was characterised; isolated islets were tested for glucagon and insulin secretion; alpha cell mass, alpha cell proliferation and α-synuclein levels were determined in pancreas sections by immunostaining. RESULTS Targeted deletion of Ide exclusively in alpha cells triggers hyperglucagonaemia and alpha cell hyperplasia, resulting in elevated constitutive glucagon secretion. The hyperglucagonaemia is attributable in part to dysregulation of glucagon secretion, specifically an impaired ability of IDE-deficient alpha cells to suppress glucagon release in the presence of high glucose or insulin. IDE deficiency also leads to α-synuclein aggregation in alpha cells, which may contribute to impaired glucagon secretion via cytoskeletal dysfunction. We showed further that IDE deficiency triggers impairments in cilia formation, inducing alpha cell hyperplasia and possibly also contributing to dysregulated glucagon secretion and hyperglucagonaemia. CONCLUSIONS/INTERPRETATION We propose that loss of IDE function in alpha cells contributes to hyperglucagonaemia in type 2 diabetes.
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Affiliation(s)
- Beatriz Merino
- Unidad de Excelencia Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain
| | - Elena Casanueva-Álvarez
- Unidad de Excelencia Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain
| | - Iván Quesada
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universidad Miguel Hernández de Elche, Elche, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Madrid, Spain
| | - Carlos M González-Casimiro
- Unidad de Excelencia Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain
| | | | - Tamara Postigo-Casado
- Unidad de Excelencia Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain
| | - Malcolm A Leissring
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine (UCI MIND), Irvine, CA, USA
| | - Klaus H Kaestner
- Department of Genetics and Institute for Diabetes, Obesity and Metabolism, University of Pennsylvania, Philadelphia, PA, USA
| | - Germán Perdomo
- Unidad de Excelencia Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain
| | - Irene Cózar-Castellano
- Unidad de Excelencia Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain.
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Madrid, Spain.
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16
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Lesire L, Leroux F, Deprez-Poulain R, Deprez B. Insulin-Degrading Enzyme, an Under-Estimated Potential Target to Treat Cancer? Cells 2022; 11:1228. [PMID: 35406791 PMCID: PMC8998118 DOI: 10.3390/cells11071228] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 03/31/2022] [Accepted: 04/01/2022] [Indexed: 02/04/2023] Open
Abstract
Insulin-degrading enzyme (IDE) is a multifunctional protease due to the variety of its substrates, its various cellular locations, its conservation between species and its many non-proteolytic functions. Numerous studies have successfully demonstrated its implication in two main therapeutic areas: metabolic and neuronal diseases. In recent years, several reports have underlined the overexpression of this enzyme in different cancers. Still, the exact role of IDE in the physiopathology of cancer remains to be elucidated. Known as the main enzyme responsible for the degradation of insulin, an essential growth factor for healthy cells and cancer cells, IDE has also been shown to behave like a chaperone and interact with the proteasome. The pharmacological modulation of IDE (siRNA, chemical compounds, etc.) has demonstrated interesting results in cancer models. All these results point towards IDE as a potential target in cancer. In this review, we will discuss evidence of links between IDE and cancer development or resistance, IDE's functions, catalytic or non-catalytic, in the context of cell proliferation, cancer development and the impact of the pharmacomodulation of IDE via cancer therapeutics.
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Affiliation(s)
| | | | - Rebecca Deprez-Poulain
- INSERM U1177 Drugs and Molecules for Living Systems, Institut Pasteur de Lille, European Genomic Institute for Diabetes, University of Lille, F-59000 Lille, France; (L.L.); (F.L.); (B.D.)
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17
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Nardo WD, Miotto PM, Bayliss J, Nie S, Keenan SN, Montgomery MK, Watt MJ. Proteomic analysis reveals exercise training induced remodelling of hepatokine secretion and uncovers syndecan-4 as a regulator of hepatic lipid metabolism. Mol Metab 2022; 60:101491. [PMID: 35381388 PMCID: PMC9034320 DOI: 10.1016/j.molmet.2022.101491] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 03/22/2022] [Accepted: 03/29/2022] [Indexed: 11/04/2022] Open
Abstract
Objective Non-alcoholic fatty liver disease (NAFLD) is linked to impaired lipid metabolism and systemic insulin resistance, which is partly mediated by altered secretion of liver proteins known as hepatokines. Regular physical activity can resolve NAFLD and improve its metabolic comorbidities, however, the effects of exercise training on hepatokine secretion and the metabolic impact of exercise-regulated hepatokines in NAFLD remain unresolved. Herein, we examined the effect of endurance exercise training on hepatocyte secreted proteins with the aim of identifying proteins that regulate metabolism and reduce NAFLD severity. Methods C57BL/6 mice were fed a high-fat diet for six weeks to induce NAFLD. Mice were exercise trained for a further six weeks, while the control group remained sedentary. Hepatocytes were isolated two days after the last exercise bout, and intracellular and secreted proteins were detected using label-free mass spectrometry. Hepatocyte secreted factors were applied to skeletal muscle and liver ex vivo and insulin action and fatty acid metabolism were assessed. Syndecan-4 (SDC4), identified as an exercise-responsive hepatokine, was overexpressed in the livers of mice using adeno-associated virus. Whole-body energy homeostasis was assessed by indirect calorimetry and skeletal muscle and liver metabolism was assessed using radiometric techniques. Results Proteomics analysis detected 2657 intracellular and 1593 secreted proteins from mouse hepatocytes. Exercise training remodelled the hepatocyte proteome, with differences in 137 intracellular and 35 secreted proteins. Bioinformatic analysis of hepatocyte secreted proteins revealed enrichment of tumour suppressive proteins and proteins involved in lipid metabolism and mitochondrial function, and suppression of oncogenes and regulators of oxidative stress. Hepatocyte secreted factors from exercise trained mice improved insulin action in skeletal muscle and increased hepatic fatty acid oxidation. Hepatocyte-specific overexpression of SDC4 reduced hepatic steatosis, which was associated with reduced hepatic fatty acid uptake, and blunted pro-inflammatory and pro-fibrotic gene expression. Treating hepatocytes with recombinant ectodomain of SDC4 (secreted form) recapitulated these effects with reduced fatty acid uptake, lipid storage and lipid droplet accumulation. Conclusions Remodelling of hepatokine secretion is an adaptation to regular exercise training that induces changes in metabolism in the liver and skeletal muscle. SDC4 is a novel exercise-responsive hepatokine that decreases fatty acid uptake and reduces steatosis in the liver. By understanding the proteomic changes in hepatocytes with exercise, these findings have potential for the discovery of new therapeutic targets for NAFLD. Exercise training remodels hepatokine secretion. Exercise regulated secreted factors improve insulin action in skeletal muscle. Syndecan-4 (SDC4) is a novel exercise-induced hepatokine. SDC4 reduces hepatic fatty acid uptake and hepatic steatosis.
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18
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Ladwa M, Bello O, Hakim O, Boselli ML, Shojaee-Moradie F, Umpleby AM, Peacock J, Amiel SA, Bonadonna RC, Goff LM. Exploring the determinants of ethnic differences in insulin clearance between men of Black African and White European ethnicity. Acta Diabetol 2022; 59:329-337. [PMID: 34661756 PMCID: PMC8863750 DOI: 10.1007/s00592-021-01809-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 10/03/2021] [Indexed: 11/27/2022]
Abstract
AIM People of Black African ancestry, who are known to be at disproportionately high risk of type 2 diabetes (T2D), typically exhibit lower hepatic insulin clearance compared with White Europeans. However, the mechanisms underlying this metabolic characteristic are poorly understood. We explored whether low insulin clearance in Black African (BA) men could be explained by insulin resistance, subclinical inflammation or adiponectin concentrations. METHODS BA and White European (WE) men, categorised as either normal glucose tolerant (NGT) or with T2D, were recruited to undergo the following: a mixed meal tolerance test with C-peptide modelling to determine endogenous insulin clearance; fasting serum adiponectin and cytokine profiles; a hyperinsulinaemic-euglycaemic clamp to measure whole-body insulin sensitivity; and magnetic resonance imaging to quantify visceral adipose tissue. RESULTS Forty BA (20 NGT and 20 T2D) and 41 WE (23 NGT and 18 T2D) men were studied. BA men had significantly lower insulin clearance (P = 0.011) and lower plasma adiponectin (P = 0.031) compared with WE men. In multiple regression analysis, ethnicity, insulin sensitivity and plasma adiponectin were independent predictors of insulin clearance, while age, visceral adiposity and tumour necrosis factor alpha (TNF-α) did not significantly contribute to the variation. CONCLUSION These data suggest that adiponectin may play a direct role in the upregulation of insulin clearance beyond its insulin-sensitising properties.
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Affiliation(s)
- Meera Ladwa
- Diabetes Research Group, Department of Nutritional Sciences, Faculty of Life Sciences and Medicine, School of Life Course Sciences, King's College London, Franklin-Wilkins Building, Room 3.87, Waterloo Campus, London, SE1 9NH, UK
| | - Oluwatoyosi Bello
- Diabetes Research Group, Department of Nutritional Sciences, Faculty of Life Sciences and Medicine, School of Life Course Sciences, King's College London, Franklin-Wilkins Building, Room 3.87, Waterloo Campus, London, SE1 9NH, UK
| | - Olah Hakim
- Diabetes Research Group, Department of Nutritional Sciences, Faculty of Life Sciences and Medicine, School of Life Course Sciences, King's College London, Franklin-Wilkins Building, Room 3.87, Waterloo Campus, London, SE1 9NH, UK
| | - Maria Linda Boselli
- Division of Endocrinology and Metabolic Disease, University of Verona School of Medicine, Verona, Italy
| | | | - A Margot Umpleby
- Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK
| | - Janet Peacock
- Department of Epidemiology, Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
| | - Stephanie A Amiel
- Diabetes Research Group, Department of Nutritional Sciences, Faculty of Life Sciences and Medicine, School of Life Course Sciences, King's College London, Franklin-Wilkins Building, Room 3.87, Waterloo Campus, London, SE1 9NH, UK
| | - Riccardo C Bonadonna
- Department of Medicine and Surgery, University of Parma and Azienda Ospedaliera Universitaria di Parma, Parma, Italy
| | - Louise M Goff
- Diabetes Research Group, Department of Nutritional Sciences, Faculty of Life Sciences and Medicine, School of Life Course Sciences, King's College London, Franklin-Wilkins Building, Room 3.87, Waterloo Campus, London, SE1 9NH, UK.
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19
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Bergman RN, Kabir M, Ader M. The Physiology of Insulin Clearance. Int J Mol Sci 2022; 23:1826. [PMID: 35163746 PMCID: PMC8836929 DOI: 10.3390/ijms23031826] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/02/2022] [Accepted: 02/02/2022] [Indexed: 02/05/2023] Open
Abstract
In the 1950's, Dr. I. Arthur Mirsky first recognized the possible importance of insulin degradation changes to the pathogenesis of type 2 diabetes. While this mechanism was ignored for decades, insulin degradation is now being recognized as a possible factor in diabetes risk. After Mirsky, the relative importance of defects in insulin release and insulin resistance were recognized as risk factors. The hyperbolic relationship between secretion and sensitivity was introduced, as was the relationship between them, as expressed as the disposition index (DI). The DI was shown to be affected by environmental and genetic factors, and it was shown to be differentiated among ethnic groups. However, the importance of differences in insulin degradation (clearance) on the disposition index relationship remains to be clarified. Direct measure of insulin clearance revealed it to be highly variable among even normal individuals, and to be affected by fat feeding and other physiologic factors. Insulin clearance is relatively lower in ethnic groups at high risk for diabetes such as African Americans and Hispanic Americans, compared to European Americans. These differences exist even for young children. Two possible mechanisms have been proposed for the importance of insulin clearance for diabetes risk: in one concept, insulin resistance per se leads to reduced clearance and diabetes risk. In a second and new concept, reduced degradation is a primary factor leading to diabetes risk, such that lower clearance (resulting from genetics or environment) leads to systemic hyperinsulinemia, insulin resistance, and beta-cell stress. Recent data by Chang and colleagues appear to support this latter hypothesis in Native Americans. The importance of insulin clearance as a risk factor for metabolic disease is becoming recognized and may be treatable.
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Affiliation(s)
- Richard N. Bergman
- Diabetes and Obesity Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA; (M.K.); (M.A.)
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20
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Kraupner N, Dinh CP, Wen X, Landry V, Herledan A, Leroux F, Bosc D, Charton J, Maillard C, Warenghem S, Duplan I, Piveteau C, Hennuyer N, Staels B, Deprez B, Deprez-Poulain R. Identification of indole-based activators of insulin degrading enzyme. Eur J Med Chem 2022; 228:113982. [PMID: 34815130 DOI: 10.1016/j.ejmech.2021.113982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 11/05/2021] [Accepted: 11/06/2021] [Indexed: 11/29/2022]
Abstract
Insulin degrading enzyme (IDE) is a zinc metalloprotease that cleaves numerous substrates among which amyloid-β and insulin. It has been linked through genetic studies to the risk of type-2 diabetes (T2D) or Alzheimer's disease (AD). Pharmacological activation of IDE is an attractive therapeutic strategy in AD. While IDE inhibition gave paradoxal activity in glucose homeostasis, recent studies, in particular in the liver suggest that IDE activators could be also of interest in diabetes. Here we describe the discovery of an original series of IDE activators by screening and structure-activity relationships. Early cellular studies show that hit 1 decreases glucose-stimulating insulin secretion. Docking studies revealed it has an unprecedented extended binding to the polyanion-binding site of IDE. These indole-based pharmacological tools are activators of both Aβ and insulin hydrolysis by IDE and could be helpful to explore the multiple roles of IDE.
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Affiliation(s)
- Nicolas Kraupner
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France
| | - Chau Phi Dinh
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France
| | - Xiaoan Wen
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France
| | - Valérie Landry
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France
| | - Adrien Herledan
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France
| | - Florence Leroux
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France; European Genomic Institute for Diabetes, EGID, University of Lille, F-59000, France
| | - Damien Bosc
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France
| | - Julie Charton
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France; European Genomic Institute for Diabetes, EGID, University of Lille, F-59000, France
| | - Clara Maillard
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France
| | - Sandrine Warenghem
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France
| | - Isabelle Duplan
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, F-59000, Lille, France; European Genomic Institute for Diabetes, EGID, University of Lille, F-59000, France
| | - Catherine Piveteau
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France
| | - Nathalie Hennuyer
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, F-59000, Lille, France; European Genomic Institute for Diabetes, EGID, University of Lille, F-59000, France
| | - Bart Staels
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, F-59000, Lille, France; European Genomic Institute for Diabetes, EGID, University of Lille, F-59000, France
| | - Benoit Deprez
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France; European Genomic Institute for Diabetes, EGID, University of Lille, F-59000, France
| | - Rebecca Deprez-Poulain
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177 - Drugs and Molecules for Living Systems, F-59000, Lille, France; European Genomic Institute for Diabetes, EGID, University of Lille, F-59000, France.
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21
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Lee SJ, Chandrasekran P, Mazucanti CH, O’Connell JF, Egan JM, Kim Y. Dietary curcumin restores insulin homeostasis in diet-induced obese aged mice. Aging (Albany NY) 2022; 14:225-239. [PMID: 35017319 PMCID: PMC8791219 DOI: 10.18632/aging.203821] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 12/29/2021] [Indexed: 06/14/2023]
Abstract
Although aging is a physiological process to which all organisms are subject, the presence of obesity and type 2 diabetes accelerates biological aging. Recent studies have demonstrated the causal relationships between dietary interventions suppressing obesity and type 2 diabetes and delaying the onset of age-related endocrine changes. Curcumin, a natural antioxidant, has putative therapeutic properties such as improving insulin sensitivity in obese mice. However, how curcumin contributes to maintaining insulin homeostasis in aged organisms largely remains unclear. Thus, the objective of this study is to examine the pleiotropic effect of dietary curcumin on insulin homeostasis in a diet-induced obese (DIO) aged mouse model. Aged (18-20 months old) male mice given a high-fat high-sugar diet supplemented with 0.4% (w/w) curcumin (equivalent to 2 g/day for a 60 kg adult) displayed a different metabolic phenotype compared to mice given a high-fat high-sugar diet alone. Furthermore, curcumin supplementation altered hepatic gene expression profiling, especially insulin signaling and senescence pathways. We then mechanistically investigated how curcumin functions to fine-tune insulin sensitivity. We found that curcumin supplementation increased hepatic insulin-degrading enzyme (IDE) expression levels and preserved islet integrity, both outcomes that are beneficial to preserving good health with age. Our findings suggest that the multifaceted therapeutic potential of curcumin can be used as a protective agent for age-induced metabolic diseases.
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Affiliation(s)
- Su-Jeong Lee
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK 74078, USA
| | - Prabha Chandrasekran
- Laboratory of Clinical Investigation, National Institute on Aging (NIA), Baltimore, MD 21224, USA
| | - Caio Henrique Mazucanti
- Laboratory of Clinical Investigation, National Institute on Aging (NIA), Baltimore, MD 21224, USA
| | - Jennifer F. O’Connell
- Laboratory of Clinical Investigation, National Institute on Aging (NIA), Baltimore, MD 21224, USA
| | - Josephine M. Egan
- Laboratory of Clinical Investigation, National Institute on Aging (NIA), Baltimore, MD 21224, USA
| | - Yoo Kim
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK 74078, USA
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22
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Fan Y, Wolford BN, Lu H, Liang W, Sun J, Zhou W, Rom O, Mahajan A, Surakka I, Graham SE, Liu Z, Kim H, Ramdas S, Fritsche LG, Nielsen JB, Gabrielsen ME, Hveem K, Yang D, Song J, Garcia-Barrio MT, Zhang J, Liu W, Zhang K, Willer CJ, Chen YE. Type 2 diabetes sex-specific effects associated with E167K coding variant in TM6SF2. iScience 2021; 24:103196. [PMID: 34746691 PMCID: PMC8554487 DOI: 10.1016/j.isci.2021.103196] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/31/2021] [Accepted: 09/27/2021] [Indexed: 02/07/2023] Open
Abstract
The rs58542926C >T (E167K) variant of the transmembrane 6 superfamily member 2 gene (TM6SF2) is associated with increased risks for nonalcoholic fatty liver disease (NAFLD) and type 2 diabetes (T2D). Nevertheless, the role of the TM6SF2 rs58542926 variant in glucose metabolism is poorly understood. We performed a sex-stratified analysis of the association between the rs58542926C >T variant and T2D in multiple cohorts. The E167K variant was significantly associated with T2D, especially in males. Using an E167K knockin (KI) mouse model, we found that male but not the female KI mice exhibited impaired glucose tolerance. As an ER membrane protein, TM6SF2 was found to interact with inositol-requiring enzyme 1 α (IRE1α), a primary ER stress sensor. The male Tm6sf2 KI mice exhibited impaired IRE1α signaling in the liver. In conclusion, the E167K variant of TM6SF2 is associated with glucose intolerance primarily in males, both in humans and mice.
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Affiliation(s)
- Yanbo Fan
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
- Department of Cancer Biology, University of Cincinnati College of Medicine, Vontz Center, 3125 Eden Avenue, Cincinnati, OH45267, USA
| | - Brooke N. Wolford
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI48109, USA
| | - Haocheng Lu
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Wenying Liang
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Jinjian Sun
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Wei Zhou
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI48109, USA
| | - Oren Rom
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA71103, USA
| | - Anubha Mahajan
- Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Ida Surakka
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Sarah E. Graham
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Zhipeng Liu
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University, West Lafayette, IN, USA
| | - Hyunbae Kim
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI48201, USA
| | - Shweta Ramdas
- Department of Genetics, University of Pennsylvania, Philadelphia, PA, USA
| | - Lars G. Fritsche
- Department of Biostatistics, University of Michigan School of Public Health, Ann Arbor, MI, USA
| | - Jonas B. Nielsen
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Maiken Elvestad Gabrielsen
- K.G. Jebsen Center for Genetic Epidemiology, Department of Public Health and Nursing, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, NTNU, Trondheim, Norway
| | - Kristian Hveem
- K.G. Jebsen Center for Genetic Epidemiology, Department of Public Health and Nursing, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, NTNU, Trondheim, Norway
| | - Dongshan Yang
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Jun Song
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Minerva T. Garcia-Barrio
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Jifeng Zhang
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
| | - Wanqing Liu
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI 48201, USA
| | - Kezhong Zhang
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI48201, USA
| | - Cristen J. Willer
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI48109, USA
- Department of Human Genetics, University of Michigan, Ann Arbor, MI, USA
| | - Y. Eugene Chen
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, NCRC Bldg 26, Rm 361S, 2800 Plymouth Road, Ann Arbor, MI 48109, USA
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23
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González-Casimiro CM, Cámara-Torres P, Merino B, Diez-Hermano S, Postigo-Casado T, Leissring MA, Cózar-Castellano I, Perdomo G. Effects of Fasting and Feeding on Transcriptional and Posttranscriptional Regulation of Insulin-Degrading Enzyme in Mice. Cells 2021; 10:cells10092446. [PMID: 34572095 PMCID: PMC8467815 DOI: 10.3390/cells10092446] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/12/2021] [Accepted: 09/15/2021] [Indexed: 12/24/2022] Open
Abstract
Insulin-degrading enzyme (IDE) is a highly conserved and ubiquitously expressed Zn2+-metallopeptidase that regulates hepatic insulin sensitivity, albeit its regulation in response to the fasting-to-postprandial transition is poorly understood. In this work, we studied the regulation of IDE mRNA and protein levels as well as its proteolytic activity in the liver, skeletal muscle, and kidneys under fasting (18 h) and refeeding (30 min and 3 h) conditions, in mice fed a standard (SD) or high-fat (HFD) diets. In the liver of mice fed an HFD, fasting reduced IDE protein levels (~30%); whereas refeeding increased its activity (~45%) in both mice fed an SD and HFD. Likewise, IDE protein levels were reduced in the skeletal muscle (~30%) of mice fed an HFD during the fasting state. Circulating lactate concentrations directly correlated with hepatic IDE activity and protein levels. Of note, L-lactate in liver lysates augmented IDE activity in a dose-dependent manner. Additionally, IDE protein levels in liver and muscle tissues, but not its activity, inversely correlated (R2 = 0.3734 and 0.2951, respectively; p < 0.01) with a surrogate marker of insulin resistance (HOMA index). Finally, a multivariate analysis suggests that circulating insulin, glucose, non-esterified fatty acids, and lactate levels might be important in regulating IDE in liver and muscle tissues. Our results highlight that the nutritional regulation of IDE in liver and skeletal muscle is more complex than previously expected in mice, and that fasting/refeeding does not strongly influence the regulation of renal IDE.
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Affiliation(s)
- Carlos M. González-Casimiro
- Unidad de Excelencia Instituto de Biología y Genética Molecular, University of Valladolid-CSIC, 47003 Valladolid, Spain; (C.M.G.-C.); (P.C.-T.); (B.M.); (T.P.-C.); (I.C.-C.)
| | - Patricia Cámara-Torres
- Unidad de Excelencia Instituto de Biología y Genética Molecular, University of Valladolid-CSIC, 47003 Valladolid, Spain; (C.M.G.-C.); (P.C.-T.); (B.M.); (T.P.-C.); (I.C.-C.)
| | - Beatriz Merino
- Unidad de Excelencia Instituto de Biología y Genética Molecular, University of Valladolid-CSIC, 47003 Valladolid, Spain; (C.M.G.-C.); (P.C.-T.); (B.M.); (T.P.-C.); (I.C.-C.)
| | - Sergio Diez-Hermano
- Institute for Research in Sustainable Forest Management (iuFOR), University of Valladolid, 34004 Palencia, Spain;
| | - Tamara Postigo-Casado
- Unidad de Excelencia Instituto de Biología y Genética Molecular, University of Valladolid-CSIC, 47003 Valladolid, Spain; (C.M.G.-C.); (P.C.-T.); (B.M.); (T.P.-C.); (I.C.-C.)
| | - Malcolm A. Leissring
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine (UCI MIND), Irvine, CA 92697-4545, USA;
| | - Irene Cózar-Castellano
- Unidad de Excelencia Instituto de Biología y Genética Molecular, University of Valladolid-CSIC, 47003 Valladolid, Spain; (C.M.G.-C.); (P.C.-T.); (B.M.); (T.P.-C.); (I.C.-C.)
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain
| | - Germán Perdomo
- Unidad de Excelencia Instituto de Biología y Genética Molecular, University of Valladolid-CSIC, 47003 Valladolid, Spain; (C.M.G.-C.); (P.C.-T.); (B.M.); (T.P.-C.); (I.C.-C.)
- Correspondence: ; Tel.: +34-983-184-805
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24
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Leissring MA. Insulin-Degrading Enzyme: Paradoxes and Possibilities. Cells 2021; 10:cells10092445. [PMID: 34572094 PMCID: PMC8472535 DOI: 10.3390/cells10092445] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 09/13/2021] [Accepted: 09/14/2021] [Indexed: 12/31/2022] Open
Abstract
More than seven decades have passed since the discovery of a proteolytic activity within crude tissue extracts that would become known as insulin-degrading enzyme (IDE). Certainly much has been learned about this atypical zinc-metallopeptidase; at the same time, however, many quite fundamental gaps in our understanding remain. Herein, I outline what I consider to be among the most critical unresolved questions within the field, many presenting as intriguing paradoxes. For instance, where does IDE, a predominantly cytosolic protein with no signal peptide or clearly identified secretion mechanism, interact with insulin and other extracellular substrates? Where precisely is IDE localized within the cell, and what are its functional roles in these compartments? How does IDE, a bowl-shaped protein that completely encapsulates its substrates, manage to avoid getting “clogged” and thus rendered inactive virtually immediately? Although these paradoxes are by definition unresolved, I offer herein my personal insights and informed speculations based on two decades working on the biology and pharmacology of IDE and suggest specific experimental strategies for addressing these conundrums. I also offer what I believe to be especially fruitful avenues for investigation made possible by the development of new technologies and IDE-specific reagents. It is my hope that these thoughts will contribute to continued progress elucidating the physiology and pathophysiology of this important peptidase.
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Affiliation(s)
- Malcolm A Leissring
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine (UCI MIND), Irvine, CA 92697, USA
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Short-Term SGLT2 Inhibitor Administration Does Not Alter Systemic Insulin Clearance in Type 2 Diabetes. Biomedicines 2021; 9:biomedicines9091154. [PMID: 34572340 PMCID: PMC8472728 DOI: 10.3390/biomedicines9091154] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 08/30/2021] [Accepted: 08/31/2021] [Indexed: 12/28/2022] Open
Abstract
Background: Decreased insulin clearance could be a relatively upstream abnormality in obesity, metabolic syndrome, and nonalcoholic fatty liver disease. Previous studies have shown that sodium-glucose cotransporter 2 inhibitor (SGLT2i) increases insulin–C-peptide ratio, a marker of insulin clearance, and improves metabolic parameters. We evaluated the effects of the SGLT2i tofogliflozin on metabolic clearance rate of insulin (MCRI) with a hyperinsulinemic euglycemic clamp study, the gold standard for measuring systemic insulin clearance. Methods: Study participants were 12 Japanese men with type 2 diabetes. We evaluated MCRI and tissue-specific insulin sensitivity with a hyperinsulinemic euglycemic clamp (insulin infusion rate, 40 mU/m2·min) before and immediately after a single dose (n = 12) and 8 weeks (n = 9) of tofogliflozin. We also measured ectopic fat in muscle and liver and the abdominal fat area using 1H-magnetic resonance spectroscopy and magnetic resonance imaging, respectively, before and after 8 weeks of tofogliflozin. Results: MCRI did not change after a single dose of tofogliflozin (594.7 ± 67.7 mL/min·m2 and 608.3 ± 90.9 mL/min·m2, p = 0.61) or after 8 weeks (582.5 ± 67.3 mL/min·m2 and 602.3 ± 67.0 mL/min·m2, p = 0.41). The 8-week treatment significantly improved glycated hemoglobin and decreased body weight (1.7%) and the subcutaneous fat area (6.4%), whereas insulin sensitivity and ectopic fat in muscle and liver did not change significantly. Conclusions: MCRI did not change after a single dose or 8 weeks of tofogliflozin. Increased MCRI does not precede a decrease in body fat or improved glycemic control.
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Sousa L, Guarda M, Meneses MJ, Macedo MP, Vicente Miranda H. Insulin-degrading enzyme: an ally against metabolic and neurodegenerative diseases. J Pathol 2021; 255:346-361. [PMID: 34396529 DOI: 10.1002/path.5777] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 07/01/2021] [Accepted: 08/09/2021] [Indexed: 11/11/2022]
Abstract
Insulin-degrading enzyme (IDE) function goes far beyond its known proteolytic role as a regulator of insulin levels. IDE has a wide substrate promiscuity, degrading several proteins such as amyloid-β peptide, glucagon, islet amyloid polypeptide (IAPP) and insulin-like growth factors, that have diverse physiological and pathophysiological functions. Importantly, IDE plays other non-proteolytical functions such as a chaperone/dead-end chaperone, an E1-ubiquitin activating enzyme, and a proteasome modulator. It also responds as a heat shock protein, regulating cellular proteostasis. Notably, amyloidogenic proteins such as IAPP, amyloid-β and α-synuclein have been reported as substrates for IDE chaperone activity. This is of utmost importance as failure of IDE may result in increased protein aggregation, a key hallmark in the pathogenesis of beta cells in type 2 diabetes mellitus and of neurons in neurodegenerative diseases such as Alzheimer's and Parkinson's disease. In this review, we focus on the biochemical and biophysical properties of IDE and the regulation of its physiological functions. We further raise the hypothesis that IDE plays a central role in the pathological context of dysmetabolic and neurodegenerative diseases and discuss its potential as a therapeutic target. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Luís Sousa
- CEDOC, NOVA Medical School, NMS, Universidade Nova de Lisboa, 1169-056, Lisbon, Portugal
| | - Mariana Guarda
- CEDOC, NOVA Medical School, NMS, Universidade Nova de Lisboa, 1169-056, Lisbon, Portugal
| | - Maria João Meneses
- CEDOC, NOVA Medical School, NMS, Universidade Nova de Lisboa, 1169-056, Lisbon, Portugal.,APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisbon, Portugal
| | - M Paula Macedo
- CEDOC, NOVA Medical School, NMS, Universidade Nova de Lisboa, 1169-056, Lisbon, Portugal.,APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisbon, Portugal.,Departamento de Ciências Médicas, Instituto de Biomedicina - iBiMED, Universidade de Aveiro, Aveiro, Portugal
| | - Hugo Vicente Miranda
- CEDOC, NOVA Medical School, NMS, Universidade Nova de Lisboa, 1169-056, Lisbon, Portugal
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27
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miR-126 contributes to the epigenetic signature of diabetic vascular smooth muscle and enhances antirestenosis effects of Kv1.3 blockers. Mol Metab 2021; 53:101306. [PMID: 34298200 PMCID: PMC8363881 DOI: 10.1016/j.molmet.2021.101306] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/09/2021] [Accepted: 07/15/2021] [Indexed: 11/22/2022] Open
Abstract
Objectives Restenosis after vessel angioplasty due to dedifferentiation of the vascular smooth muscle cells (VSMCs) limits the success of surgical treatment of vascular occlusions. Type 2 diabetes (T2DM) has a major impact on restenosis, with patients exhibiting more aggressive forms of vascular disease and poorer outcomes after surgery. Kv1.3 channels are critical players in VSMC proliferation. Kv1.3 blockers inhibit VSMCs MEK/ERK signalling and prevent vessel restenosis. We hypothesize that dysregulation of microRNAs (miR) play critical roles in adverse remodelling, contributing to Kv1.3 blockers efficacy in T2DM VSMCs. Methods and results We used clinically relevant in vivo models of vascular risk factors (VRF) and vessels and VSMCs from T2DM patients. Resukts Human T2DM vessels showed increased remodelling, and changes persisted in culture, with augmented VSMCs migration and proliferation. Moreover, there were downregulation of PI3K/AKT/mTOR and upregulation of MEK/ERK pathways, with increased miR-126 expression. The inhibitory effects of Kv1.3 blockers on remodelling were significantly enhanced in T2DM VSMCs and in VRF model. Finally, miR-126 overexpression confered “diabetic” phenotype to non-T2DM VSMCs by downregulating PI3K/AKT axis. Conclusions miR-126 plays crucial roles in T2DM VSMC metabolic memory through activation of MEK/ERK pathway, enhancing the efficacy of Kv1.3 blockers in the prevention of restenosis in T2DM patients. Type 2 diabetes (T2DM) vessels show exacerbated remodeling in organ culture and increased Kv1.3 expression. The inhibition of vessel remodeling with Kv1.3 blockers is increased in T2DM vessels. VSMCs from T2DM patients retain epigenetic changes in primary cultures. Upregulation of miR-126 contributes to the metabolic memory of T2DM VSMCs. Upregulation of miR-126 potentiates Kv1.3-dependent mechanisms in T2DM VSMCs.
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Expression of IDE and PITRM1 genes in ERN1 knockdown U87 glioma cells: effect of hypoxia and glucose deprivation. Endocr Regul 2021; 54:183-195. [PMID: 32857715 DOI: 10.2478/enr-2020-0021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
OBJECTIVE The aim of the present investigation was to study the expression of genes encoding polyfunctional proteins insulinase (insulin degrading enzyme, IDE) and pitrilysin metallopeptidase 1 (PITRM1) in U87 glioma cells in response to inhibition of endoplasmic reticulum stress signaling mediated by ERN1/IRE1 (endoplasmic reticulum to nucleus signaling 1) for evaluation of their possible significance in the control of metabolism through ERN1 signaling as well as hypoxia, glucose and glutamine deprivations. METHODS The expression level of IDE and PITRM1 genes was studied in control and ERN1 knockdown U87 glioma cells under glucose and glutamine deprivations as well as hypoxia by quantitative polymerase chain reaction. RESULTS It was found that the expression level of IDE and PITRM1 genes was down-regulated in ERN1 knockdown (without ERN1 protein kinase and endoribonuclease activity) glioma cells in comparison with the control glioma cells, being more significant for PITRM1 gene. We also found up-regulation of microRNA MIR7-2 and MIRLET7A2, which have specific binding sites in 3'-untranslated region of IDE and PITRM1 mRNAs, correspondingly, and can participate in posttranscriptional regulation of these mRNA expressions. Only inhibition of ERN1 endoribonuclease did not change significantly the expression of IDE and PITRM1 genes in glioma cells. The expression of IDE and PITRM1 genes is preferentially regulated by ERN1 protein kinase. We also showed that hypoxia down-regulated the expression of IDE and PITRM1 genes and that knockdown of ERN1 signaling enzyme function modified the response of these gene expressions to hypoxia. Glucose deprivation increased the expression level of IDE and PITRM1 genes, but ERN1 knockdown enhanced only the effect of glucose deprivation on PITRM1 gene expression. Glutamine deprivation did not affect the expression of IDE gene in both types of glioma cells, but up-regulated PITRM1 gene and this up-regulation was stronger in ERN1 knockdown cells. CONCLUSIONS Results of this investigation demonstrate that ERN1 knockdown significantly decreases the expression of IDE and PITRM1 genes by ERN1 protein kinase mediated mechanism. The expression of both studied genes was sensitive to hypoxia as well as glucose deprivation and dependent on ERN1 signaling in gene-specific manner. It is possible that the level of these genes expression under hypoxia and glucose deprivation is a result of complex interaction of variable endoplasmic reticulum stress related and unrelated regulatory factors and contributed to the control of the cell metabolism.
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Borges DO, Patarrão RS, Ribeiro RT, de Oliveira RM, Duarte N, Belew GD, Martins M, Andrade R, Costa J, Correia I, Boavida JM, Duarte R, Gardete-Correia L, Medina JL, Raposo JF, Jones JG, Penha-Gonçalves C, Macedo MP. Loss of postprandial insulin clearance control by Insulin-degrading enzyme drives dysmetabolism traits. Metabolism 2021; 118:154735. [PMID: 33631143 DOI: 10.1016/j.metabol.2021.154735] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Revised: 02/10/2021] [Accepted: 02/15/2021] [Indexed: 02/05/2023]
Abstract
Systemic insulin availability is determined by a balance between beta-cell secretion capacity and insulin clearance (IC). Insulin-degrading enzyme (IDE) is involved in the intracellular mechanisms underlying IC. The liver is a major player in IC control yet the role of hepatic IDE in glucose and lipid homeostasis remains unexplored. We hypothesized that IDE governs postprandial IC and hepatic IDE dysfunction amplifies dysmetabolic responses and prediabetes traits such as hepatic steatosis. In a European/Portuguese population-based cohort, IDE SNPs were strongly associated with postprandial IC in normoglycemic men but to a considerably lesser extent in women or in subjects with prediabetes. Liver-specific knockout-mice (LS-IDE KO) under normal chow diet (NCD), showed reduced postprandial IC with glucose intolerance and under high fat diet (HFD) were more susceptible to hepatic steatosis than control mice. This suggests that regulation of IC by IDE contributes to liver metabolic resilience. In agreement, LS-IDE KO hepatocytes revealed reduction of Glut2 expression levels with consequent impairment of glucose uptake and upregulation of CD36, a major hepatic free fatty acid transporter. Together these findings provide strong evidence that dysfunctional IC due to abnormal IDE regulation directly impairs postprandial hepatic glucose disposal and increases susceptibility to dysmetabolic conditions in the setting of Western diet/lifestyle.
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Affiliation(s)
- Diego O Borges
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal; Molecular Biosciences PhD Program, Instituto de Tecnologia Química e Biológica António Xavier - ITQB NOVA, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Rita S Patarrão
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal; Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - Rogério T Ribeiro
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal; Departamento de Ciências Médicas, Instituto de Biomedicina - iBiMED, Universidade de Aveiro, Aveiro, Portugal
| | - Rita Machado de Oliveira
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal
| | - Nádia Duarte
- Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | | | | | - Rita Andrade
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - João Costa
- Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - Isabel Correia
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - José Manuel Boavida
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - Rui Duarte
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - Luís Gardete-Correia
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | | | - João F Raposo
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal; Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - John G Jones
- APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal; Center for Neurosciences and Cell Biology, University of Coimbra, Portugal
| | - Carlos Penha-Gonçalves
- Instituto Gulbenkian de Ciência, Oeiras, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - M Paula Macedo
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal; Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal; Departamento de Ciências Médicas, Instituto de Biomedicina - iBiMED, Universidade de Aveiro, Aveiro, Portugal.
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Taschetto APD, Zimath PL, Silvério R, Dos Santos C, Boschero AC, Dos Santos GJ, Rafacho A. Reduced insulin sensitivity and increased β/α cell mass is associated with reduced hepatic insulin-degrading enzyme activity in pregnant rats. Life Sci 2021; 277:119509. [PMID: 33865877 DOI: 10.1016/j.lfs.2021.119509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/05/2021] [Accepted: 04/07/2021] [Indexed: 11/19/2022]
Abstract
AIMS Pregnancy is associated with the development of a transitory insulin resistance that parallels with the upregulation of pancreatic β-cell function and mass. These metabolic adaptations guarantee the higher insulin demand, but there is no evidence of whether insulin clearance contributes to this process. Thus, we investigated some of the hepatic parameters related to insulin clearance during rat pregnancy. We also investigated some molecular parameters in the hypothalamus. MAIN METHODS We evaluated the body mass and food intake, insulin sensitivity, β- and α-cell masses, insulin clearance based on an exogenous insulin load, hepatic insulin-degrading enzyme (IDE) activity, and hepatic and hypothalamic protein content of IDE and carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM-1) in three periods of gestation in Wistar rats. KEY FINDINGS In the first week of pregnancy, both insulin sensitivity and clearance increased, a pattern that inverted in the third week of gestation (reduced insulin sensitivity and clearance). Diminished insulin clearance was associated with lower hepatic IDE activity and higher pancreatic β- and α-cell masses. No alteration in the hepatic IDE and CEACAM protein content was observed throughout pregnancy, but hypothalamic IDE protein content was significantly reduced in the late gestation period. SIGNIFICANCE In conclusion, elevated insulin demand in the late period of gestation occurs not only as a result of increased β-cell mass and function but also by a potential reduction in hepatic insulin clearance. Knowing this physiological process may be valuable when considering gestational diabetes mellitus results from a failure in insulin supply during pregnancy.
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Affiliation(s)
- Ana P D Taschetto
- Laboratory of Investigation in Chronic Diseases - LIDoC, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil; Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil
| | - Priscila L Zimath
- Laboratory of Investigation in Chronic Diseases - LIDoC, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil; Graduate Program in Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil
| | - Renata Silvério
- Laboratory of Investigation in Chronic Diseases - LIDoC, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil; Graduate Program in Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil
| | - Cristiane Dos Santos
- Laboratory of Investigation in Chronic Diseases - LIDoC, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil; Graduate Program in Molecular and Functional Biology, Institute of Biology, Campinas State University - UNICAMP, 13083-862 Campinas, Brazil
| | - Antonio C Boschero
- Graduate Program in Molecular and Functional Biology, Institute of Biology, Campinas State University - UNICAMP, 13083-862 Campinas, Brazil
| | - Gustavo J Dos Santos
- Laboratory of Investigation in Chronic Diseases - LIDoC, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil; Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil
| | - Alex Rafacho
- Laboratory of Investigation in Chronic Diseases - LIDoC, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil; Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil; Graduate Program in Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina - UFSC, 88040-900 Florianópolis, Brazil; Graduate Program in Molecular and Functional Biology, Institute of Biology, Campinas State University - UNICAMP, 13083-862 Campinas, Brazil.
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Nonaka Y, Takeda R, Kano Y, Hoshino D. Short-Term Calorie Restriction Maintains Plasma Insulin Concentrations along with a Reduction in Hepatic Insulin-Degrading Enzyme Levels in db/db Mice. Nutrients 2021; 13:nu13041190. [PMID: 33916828 PMCID: PMC8065522 DOI: 10.3390/nu13041190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 03/26/2021] [Accepted: 03/29/2021] [Indexed: 12/11/2022] Open
Abstract
Maintaining blood insulin levels is important for patients with diabetes because insulin secretion capacity declines with the development of the disease. Calorie restriction (CR) is effective for the improvement of glucose tolerance, but it is not clear whether CR can maintain insulin levels in the late stage of diabetes. We examined the effect of CR on whole-body glucose tolerance and fasting blood insulin concentrations in the late stage of diabetes. Male db/db mice were subjected to either a standard laboratory diet ad libitum for 3 weeks (dbdb group) or 40% CR (dbdb+CR group). CR significantly decreased body mass and epididymal fat weight. Glucose tolerance and fasting glucose levels were significantly improved with 3-week CR. Fasting insulin concentrations were decreased in the dbdb group but were maintained in the dbdb+CR group. CR significantly reduced insulin-degrading enzyme (IDE) levels in the liver, and hepatic IDE levels were significantly positively and negatively correlated with plasma glucose concentrations (area under the curve) after glucose administration and after fasting insulin concentrations, respectively. Therefore, 3-week CR maintained blood insulin levels and improved glucose tolerance with decreased hepatic IDE levels in an animal model of late-stage diabetes.
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Affiliation(s)
- Yudai Nonaka
- Bioscience and Technology Program, Department of Engineering Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan; (R.T.); (Y.K.); (D.H.)
- Japan Society for the Promotion of Science (JSPS), Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
- Correspondence: ; Tel.: +81-42-443-5589
| | - Reo Takeda
- Bioscience and Technology Program, Department of Engineering Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan; (R.T.); (Y.K.); (D.H.)
| | - Yutaka Kano
- Bioscience and Technology Program, Department of Engineering Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan; (R.T.); (Y.K.); (D.H.)
| | - Daisuke Hoshino
- Bioscience and Technology Program, Department of Engineering Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan; (R.T.); (Y.K.); (D.H.)
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de Oliveira DM, Tura A, Vasques ACJ, Camilo DF, Lima MM, de Lemos-Marini SHV, Goncalves EM, Guerra-Junior G, Geloneze B. Insulin Resistance in Congenital Adrenal Hyperplasia is Compensated for by Reduced Insulin Clearance. J Clin Endocrinol Metab 2021; 106:e1574-e1585. [PMID: 33421070 DOI: 10.1210/clinem/dgab010] [Citation(s) in RCA: 4] [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: 05/21/2020] [Indexed: 11/19/2022]
Abstract
CONTEXT Congenital adrenal hyperplasia (CAH) patients have potential normal longevity. However, a greater risk for cardiovascular disease has been reported. Insulin resistance and hyperinsulinemia have been described in CAH patients, whereas the prevalence of overt type 2 diabetes is not higher in CAH than in normal population. OBJECTIVE To examine the contributions of insulin secretion and of hepatic insulin clearance to compensatory hyperinsulinemia in young insulin-resistant adults with classic CAH due to 21-hydroxylase deficiency (21-OHD). DESIGN Cross-sectional. SETTING University outpatient clinics. METHODS Fifty-one participants: 21 controls, and 30 CAH (15 virilizing and 15 salt-wasting phenotypes), female/male (33/18), age (mean [SD]): 24.0 (3.6) years, body mass index: 24.6 (4.9)kg/m2 with normal glucose tolerance, were submitted to a hyperglycemic clamp study. MAIN OUTCOME MEASURES Insulin sensitivity, beta cell function, and hepatic insulin clearance using appropriate modeling. RESULTS We found an increased insulin resistance in 21-OHD. The systemic hyperinsulinemia (posthepatic insulin delivery) was elevated in CAH patients. No increases were observed in insulin secretory rate (beta cell function) in the first phase or during the hyperglycemic clamp. The increase in insulin concentrations was totally due to a ~33% reduction in insulin clearance. CONCLUSION 21-OHD nonobese subjects have reduced insulin sensitivity and beta cell response unable to compensate for the insulin resistance, probably due to overexposure to glucocorticoids. Compensatory hyperinsulinemia is most related with reduced hepatic insulin clearance. The exclusive adaptation of the liver acts as a gating mechanism to regulate the access of insulin to insulin-sensitive tissues to maintain glucose homeostasis.
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Affiliation(s)
- Daniel Minutti de Oliveira
- Laboratory of Investigation in Metabolism and Diabetes (LIMED), Gastrocentro, University of Campinas (UNICAMP), Campinas, Brazil
| | - Andrea Tura
- Metabolic Unit, CNR Institute of Neuroscience, Padova, Italy
| | - Ana Carolina Junqueira Vasques
- Laboratory of Investigation in Metabolism and Diabetes (LIMED), Gastrocentro, University of Campinas (UNICAMP), Campinas, Brazil
- School of Applied Sciences, University of Campinas (UNICAMP), Limeira, Brazil
| | - Daniella Fernandes Camilo
- Laboratory of Investigation in Metabolism and Diabetes (LIMED), Gastrocentro, University of Campinas (UNICAMP), Campinas, Brazil
| | - Marcelo Miranda Lima
- Laboratory of Investigation in Metabolism and Diabetes (LIMED), Gastrocentro, University of Campinas (UNICAMP), Campinas, Brazil
| | | | - Ezequiel Moreira Goncalves
- Growth and Development Laboratory-Center for Investigation in Pediatrics (CIPED), University of Campinas (UNICAMP), Campinas, Brazil
| | - Gil Guerra-Junior
- Pediatric Endocrinology Department, University of Campinas (UNICAMP), Campinas, Brazil
- Growth and Development Laboratory-Center for Investigation in Pediatrics (CIPED), University of Campinas (UNICAMP), Campinas, Brazil
| | - Bruno Geloneze
- Laboratory of Investigation in Metabolism and Diabetes (LIMED), Gastrocentro, University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
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Leissring MA, González-Casimiro CM, Merino B, Suire CN, Perdomo G. Targeting Insulin-Degrading Enzyme in Insulin Clearance. Int J Mol Sci 2021; 22:ijms22052235. [PMID: 33668109 PMCID: PMC7956289 DOI: 10.3390/ijms22052235] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/20/2021] [Accepted: 02/21/2021] [Indexed: 02/07/2023] Open
Abstract
Hepatic insulin clearance, a physiological process that in response to nutritional cues clears ~50–80% of circulating insulin, is emerging as an important factor in our understanding of the pathogenesis of type 2 diabetes mellitus (T2DM). Insulin-degrading enzyme (IDE) is a highly conserved Zn2+-metalloprotease that degrades insulin and several other intermediate-size peptides. Both, insulin clearance and IDE activity are reduced in diabetic patients, albeit the cause-effect relationship in humans remains unproven. Because historically IDE has been proposed as the main enzyme involved in insulin degradation, efforts in the development of IDE inhibitors as therapeutics in diabetic patients has attracted attention during the last decades. In this review, we retrace the path from Mirsky’s seminal discovery of IDE to the present, highlighting the pros and cons of the development of IDE inhibitors as a pharmacological approach to treating diabetic patients.
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Affiliation(s)
- Malcolm A. Leissring
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine (UCI MIND), Irvine, CA 92697-4545, USA
- Correspondence: (M.A.L.); (G.P.); Tel.: +1-904-254-3050 (M.A.L.); +34-983-184-805 (G.P.)
| | - Carlos M. González-Casimiro
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), 47003 Valladolid, Spain; (C.M.G.-C.); (B.M.)
| | - Beatriz Merino
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), 47003 Valladolid, Spain; (C.M.G.-C.); (B.M.)
| | - Caitlin N. Suire
- Department of Biomedical Sciences, Florida State University, Tallahassee, FL 32306-4300, USA;
| | - Germán Perdomo
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), 47003 Valladolid, Spain; (C.M.G.-C.); (B.M.)
- Correspondence: (M.A.L.); (G.P.); Tel.: +1-904-254-3050 (M.A.L.); +34-983-184-805 (G.P.)
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Abstract
Aging is characterized by a progressive loss of physiological function leading to increase in the vulnerability to death. This deterioration process occurs in all living organisms and is the primary risk factor for pathological conditions including obesity, type 2 diabetes mellitus, Alzheimer's disease and cardiovascular diseases. Most of the age-related diseases have been associated with impairment of action of an important hormone, namely insulin. It is well-known that this hormone is a critical mediator of metabolism, growth, proliferation and differentiation. Insulin action depends on two processes that determine its circulating levels, insulin secretion and clearance, and insulin sensitivity in its target tissues. Aging has deleterious effects on these three mechanisms, impairing insulin action, thereby increasing the risk for diseases and death. Thus, improving insulin action may be an important strategy to have a healthier and longer life.
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Modulation of Insulin Sensitivity by Insulin-Degrading Enzyme. Biomedicines 2021; 9:biomedicines9010086. [PMID: 33477364 PMCID: PMC7830943 DOI: 10.3390/biomedicines9010086] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 01/14/2021] [Accepted: 01/15/2021] [Indexed: 12/15/2022] Open
Abstract
Insulin-degrading enzyme (IDE) is a highly conserved and ubiquitously expressed metalloprotease that degrades insulin and several other intermediate-size peptides. For many decades, IDE had been assumed to be involved primarily in hepatic insulin clearance, a key process that regulates availability of circulating insulin levels for peripheral tissues. Emerging evidence, however, suggests that IDE has several other important physiological functions relevant to glucose and insulin homeostasis, including the regulation of insulin secretion from pancreatic β-cells. Investigation of mice with tissue-specific genetic deletion of Ide in the liver and pancreatic β-cells (L-IDE-KO and B-IDE-KO mice, respectively) has revealed additional roles for IDE in the regulation of hepatic insulin action and sensitivity. In this review, we discuss current knowledge about IDE’s function as a regulator of insulin secretion and hepatic insulin sensitivity, both evaluating the classical view of IDE as an insulin protease and also exploring evidence for several non-proteolytic functions. Insulin proteostasis and insulin sensitivity have both been highlighted as targets controlling blood sugar levels in type 2 diabetes, so a clearer understanding the physiological functions of IDE in pancreas and liver could led to the development of novel therapeutics for the treatment of this disease.
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Marmentini C, Soares GM, Bronczek GA, Piovan S, Mareze-Costa CE, Carneiro EM, Boschero AC, Kurauti MA. Aging Reduces Insulin Clearance in Mice. Front Endocrinol (Lausanne) 2021; 12:679492. [PMID: 34054736 PMCID: PMC8150109 DOI: 10.3389/fendo.2021.679492] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 04/29/2021] [Indexed: 12/20/2022] Open
Abstract
Hyperinsulinemia is frequently associated with aging and may cause insulin resistance in elderly. Since insulin secretion and clearance decline with age, hyperinsulinemia seems to be maintained, primarily, due to a decrease in the insulin clearance. To investigate these aging effects, 3- and 18-month-old male C57BL/6 mice were subjected to intraperitoneal glucose and insulin tolerance tests (ipGTT and ipITT) and, during the ipGTT, plasma c-peptide and insulin were measure to evaluate in vivo insulin clearance. Glucose-stimulated insulin secretion in isolated pancreatic islets was also assessed, and liver samples were collected for molecular analyses (western blot). Although insulin sensitivity was not altered in the old mice, glucose tolerance, paradoxically, seems to be increased, accompanied by higher plasma insulin, during ipGTT. While insulin secretion did not increase, insulin clearance was reduced in the old mice, as suggested by the lower c-peptide:insulin ratio, observed during ipGTT. Carcinoembryonic antigen-related cell adhesion molecule-1 (CEACAM1) and insulin-degrading enzyme (IDE), as well as the activity of this enzyme, were reduced in the liver of old mice, justifying the decreased insulin clearance observed in these mice. Therefore, loss of hepatic CEACAM1 and IDE function may be directly related to the decline in insulin clearance during aging.
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Affiliation(s)
- Carine Marmentini
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Gabriela M. Soares
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Gabriela A. Bronczek
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Silvano Piovan
- Department of Physiological Sciences, Biological Sciences Center, State University of Maringa (UEM), Maringa, Brazil
| | - Cecília E. Mareze-Costa
- Department of Physiological Sciences, Biological Sciences Center, State University of Maringa (UEM), Maringa, Brazil
| | - Everardo M. Carneiro
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Antonio C. Boschero
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Mirian A. Kurauti
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
- Department of Physiological Sciences, Biological Sciences Center, State University of Maringa (UEM), Maringa, Brazil
- *Correspondence: Mirian A. Kurauti, ;
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Diwekar-Joshi M, Watve M. Driver versus navigator causation in biology: the case of insulin and fasting glucose. PeerJ 2020; 8:e10396. [PMID: 33365205 PMCID: PMC7735078 DOI: 10.7717/peerj.10396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 10/29/2020] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND In biomedicine, inferring causal relation from experimental intervention or perturbation is believed to be a more reliable approach than inferring causation from cross-sectional correlation. However, we point out here that even in interventional inference there are logical traps. In homeostatic systems, causality in a steady state can be qualitatively different from that in a perturbed state. On a broader scale there is a need to differentiate driver causality from navigator causality. A driver is essential for reaching a destination but may not have any role in deciding the destination. A navigator on the other hand has a role in deciding the destination and the path but may not be able to drive the system to the destination. The failure to differentiate between types of causalities is likely to have resulted into many misinterpretations in physiology and biomedicine. METHODS We illustrate this by critically re-examining a specific case of the causal role of insulin in glucose homeostasis using five different approaches (1) Systematic review of tissue specific insulin receptor knock-outs, (2) Systematic review of insulin suppression and insulin enhancement experiments, (3) Differentiating steady state and post-meal state glucose levels in streptozotocin treated rats in primary experiments, (4) Mathematical and theoretical considerations and (5) Glucose-insulin relationship in human epidemiological data. RESULTS All the approaches converge on the inference that although insulin action hastens the return to a steady state after a glucose load, there is no evidence that insulin action determines the steady state level of glucose. Insulin, unlike the popular belief in medicine, appears to be a driver but not a navigator for steady state glucose level. It is quite likely therefore that the current line of clinical action in the field of type 2 diabetes has limited success largely because it is based on a misinterpretation of glucose-insulin relationship. The insulin-glucose example suggests that we may have to carefully re-examine causal inferences from perturbation experiments and set up revised norms for experimental design for causal inference.
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Affiliation(s)
- Manawa Diwekar-Joshi
- Biology, Indian Institute of Science Education and Research, Pune, Maharashtra, India
| | - Milind Watve
- Deenanath Mangeshkar Hospital and Research Centre, Pune, Maharashtra, India
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Guerra S, Gastaldelli A. The role of the liver in the modulation of glucose and insulin in non alcoholic fatty liver disease and type 2 diabetes. Curr Opin Pharmacol 2020; 55:165-174. [PMID: 33278735 DOI: 10.1016/j.coph.2020.10.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 10/12/2020] [Accepted: 10/19/2020] [Indexed: 12/20/2022]
Abstract
In this review we have discussed how the liver plays a central role in the regulation of glucose metabolism and in insulin clearance. Both non-alcoholic fatty liver disease (NAFLD) and diabetes (T2D) are characterized by high plasma insulin concentrations, hepatic insulin resistance, high hepatic glucose production (HGP), in particular gluconeogenesis (GNG), that are increased proportionally to fasting hyperglycemia, while postprandial hyperglycemia is due to impaired suppression of HGP by insulin, and reduced hepatic glycogen storage. The liver acts also as a modulator of peripheral insulin since most of insulin secreted by the pancreas is cleared by the liver during the first pass. Hepatokines and hepatic lipids can act in either autocrine or paracrine way and can be responsible of the changes in insulin sensitivity and alterations in glucose metabolism.
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Affiliation(s)
- Sara Guerra
- Cardiometabolic Risk Unit, Institute of Clinical Physiology, CNR, Pisa, Italy; Institute of Life Sciences, Sant'Anna School of Advanced Studies, Pisa, Italy
| | - Amalia Gastaldelli
- Cardiometabolic Risk Unit, Institute of Clinical Physiology, CNR, Pisa, Italy; Institute of Life Sciences, Sant'Anna School of Advanced Studies, Pisa, Italy.
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Merino B, Fernández-Díaz CM, Parrado-Fernández C, González-Casimiro CM, Postigo-Casado T, Lobatón CD, Leissring MA, Cózar-Castellano I, Perdomo G. Hepatic insulin-degrading enzyme regulates glucose and insulin homeostasis in diet-induced obese mice. Metabolism 2020; 113:154352. [PMID: 32916153 PMCID: PMC8616598 DOI: 10.1016/j.metabol.2020.154352] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 08/20/2020] [Accepted: 09/03/2020] [Indexed: 02/07/2023]
Abstract
UNLABELLED The insulin-degrading enzyme (IDE) is a metalloendopeptidase with a high affinity for insulin. Human genetic polymorphisms in Ide have been linked to increased risk for T2DM. In mice, hepatic Ide ablation causes glucose intolerance and insulin resistance when mice are fed a regular diet. OBJECTIVE These studies were undertaken to further investigate its regulatory role in glucose homeostasis and insulin sensitivity in diet-induced obesity. METHODS To this end, we have compared the metabolic effects of loss versus gain of IDE function in mice fed a high-fat diet (HFD). RESULTS We demonstrate that loss of IDE function in liver (L-IDE-KO mouse) exacerbates hyperinsulinemia and insulin resistance without changes in insulin clearance but in parallel to an increase in pancreatic β-cell function. Insulin resistance was associated with increased FoxO1 activation and a ~2-fold increase of GLUT2 protein levels in the liver of HFD-fed mice in response to an intraperitoneal injection of insulin. Conversely, gain of IDE function (adenoviral delivery) improves glucose tolerance and insulin sensitivity, in parallel to a reciprocal ~2-fold reduction in hepatic GLUT2 protein levels. Furthermore, in response to insulin, IDE co-immunoprecipitates with the insulin receptor in liver lysates of mice with adenoviral-mediated liver overexpression of IDE. CONCLUSIONS We conclude that IDE regulates hepatic insulin action and whole-body glucose metabolism in diet-induced obesity via insulin receptor levels.
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Affiliation(s)
- Beatriz Merino
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain
| | | | - Cristina Parrado-Fernández
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain; AlzeCure Pharma AB, Huddinge, Sweden
| | | | - Tamara Postigo-Casado
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain.
| | - Carmen D Lobatón
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain.
| | - Malcolm A Leissring
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine (UCI MIND), Irvine, CA, USA.
| | - Irene Cózar-Castellano
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Madrid, Spain.
| | - Germán Perdomo
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), Valladolid, Spain; Departamento de Ciencias de la Salud, Universidad de Burgos, Burgos, Spain.
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Akhtar A, Bishnoi M, Sah SP. Sodium orthovanadate improves learning and memory in intracerebroventricular-streptozotocin rat model of Alzheimer's disease through modulation of brain insulin resistance induced tau pathology. Brain Res Bull 2020; 164:83-97. [PMID: 32784004 DOI: 10.1016/j.brainresbull.2020.08.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 07/30/2020] [Accepted: 08/04/2020] [Indexed: 12/11/2022]
Abstract
Sporadic Alzheimer's disease (sAD) is the most common type of dementia and progressive neurodegenerative disease. To establish the sAD model, intracerebroventricular (ICV) streptozotocin (STZ) at a dose of 3 mg/kg was administered bilaterally in rats on a stereotaxic apparatus. Behavioral tests such as Morris water maze (MWM), novel object recognition (NOR) and open field test were performed to evaluate cognitive and locomotor functions. Two treatment doses (5 mg/kg and 10 mg/kg) of sodium orthovanadate (SOV) and rivastigmine (2 mg/kg) were given orally to ICV-STZ induced rats for 21 days. Cortical and hippocampal tissues were dissected. Estimation of oxidative stress, mitochondrial dysfunction as complex I, II, III, IV activity, cholinergic function as acetylcholinesterase activity, ELISA for phosphorylated tau protein and insulin degrading enzyme (IDE), neuroinflammation as NF-κB gene expression and insulin signaling functioning as Q-RT-PCR for IR, IRS-1, PI3K, AKT, GSK-3β gene expression were performed. Behavioral results with SOV and rivastigmine treatment revealed decreased escape latency and increased discrimination index in MWM and NOR respectively. Treatment results with SOV also demonstrated attenuation of oxidative imbalance, improved mitochondrial activity, and reversed IDE and tau pathology. SOV treatment upregulated gene expression of IR, IRS-1, PI3K, and AKT, and downregulated that of GSK-3β. SOV results were compared with standard drug rivastigmine. Conclusively, the memory enhancement by SOV was mediated through oxidative balance, mitochondrial enzyme complex activation, and improved insulin signaling regulation. However, the primary mechanism of SOV remained attenuation of tau pathology by the upregulation of IRS-1/PI3K/AKT/GSK-3β pathway and reversal of insulin resistance in terms of IDE. Hence, in sAD paradigm, SOV contributed to memory improvement evident with the findings of behavioral studies, which can further potentially have clinical significance in AD.
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Affiliation(s)
- Ansab Akhtar
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh 160014, India
| | - Mahendra Bishnoi
- National Agri-Food Biotechnology Institute (NABI), Sector-81, SAS Nagar, Mohali 140306, Punjab, India
| | - Sangeeta Pilkhwal Sah
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh 160014, India.
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41
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Ginsenoside Rb1 Improves Cognitive Impairment Induced by Insulin Resistance through Cdk5/p35-NMDAR-IDE Pathway. BIOMED RESEARCH INTERNATIONAL 2020; 2020:3905719. [PMID: 32550230 PMCID: PMC7256773 DOI: 10.1155/2020/3905719] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 03/15/2020] [Accepted: 04/20/2020] [Indexed: 02/06/2023]
Abstract
The relationship between diabetes mellitus (DM) and Alzheimer's disease (AD) has attracted wide attention. Studies have reported that ginsenoside Rb1 can improve human cognitive ability and glucose tolerance during the development of diabetes. The mechanism behind the improvement in cognitive ability and glucose tolerance still remains unclear. In this study, streptozotocin- (STZ-) injected mice were used as models to explore the mechanisms behind the cognitive improvement of ginsenoside Rb1. According to the results of behavioral tests, ginsenoside Rb1 improved memory and cognitive ability of STZ-lesioned mice. In addition to that, ginsenoside Rb1 also relieved glucose intolerance induced by STZ injection by enhancing insulin sensitivity. These beneficial effects of ginsenoside Rb1 is most likely mediated by upregulating the expression of NMDAR1 and IDE in the hippocampus through inhibiting the activity of Cdk5/p35. This work will be of great importance in illustrating the mechanisms of ginsenoside Rb1 for improving cognitive ability, as well as revealing the relationship between diabetes and AD.
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42
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Lin Y, Liu J, Chen J, Yao C, Yang Y, Wang J, Zhuang H, Hua ZC. FADD Phosphorylation Modulates Blood Glucose Levels by Decreasing the Expression of Insulin-Degrading Enzyme. Mol Cells 2020; 43:373-383. [PMID: 32191993 PMCID: PMC7191044 DOI: 10.14348/molcells.2020.2198] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 01/07/2020] [Accepted: 01/19/2020] [Indexed: 02/08/2023] Open
Abstract
Our previous study revealed a novel role of Fas-associated death domain-containing protein (FADD) in islet development and insulin secretion. Insulin-degrading enzyme (IDE) is a zinc metalloprotease that selectively degrades biologically important substrates associated with type 2 diabetes (T2DM). The current study was designed to investigate the effect of FADD phosphorylation on IDE. We found that the mRNA and protein levels of IDE were significantly downregulated in FADD-D mouse livers compared with control mice. Quantitative real-time polymerase chain reaction analysis showed that FADD regulates the expression of IDE at the transcriptional level without affecting the stability of the mRNA in HepG2 cells. Following treatment with cycloheximide, the IDE protein degradation rate was found to be increased in both FADD-D primary hepatocytes and FADD-knockdown HepG2 cells. Additionally, IDE expression levels were reduced in insulin-stimulated primary hepatocytes from FADD-D mice compared to those from control mice. Moreover, FADD phosphorylation promotes nuclear translocation of FoxO1, thus inhibiting the transcriptional activity of the IDE promoter. Together, these findings imply a novel role of FADD in the reduction of protein stability and expression levels of IDE.
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Affiliation(s)
- Yan Lin
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing
- , China, School of Nursing, Xinxiang Medical University, Xinxiang 45, China
| | - Jia Liu
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing
| | - Jia Chen
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing
| | - Chun Yao
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing
| | - Yunwen Yang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing
| | - Jie Wang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing
| | - Hongqin Zhuang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing
| | - Zi-Chun Hua
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing
- Changzhou High-Tech Research Institute of Nanjing University and Jiangsu TargetPharma Laboratories Inc., Changzhou 21164, China
- Shenzhen Research Institute of Nanjing University, Shenzhen 518057, China
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43
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Herledan A, Andres M, Lejeune-Dodge A, Leroux F, Biela A, Piveteau C, Warenghem S, Couturier C, Deprez B, Deprez-Poulain R. Drug Target Engagement Using Coupled Cellular Thermal Shift Assay-Acoustic Reverse-Phase Protein Array. SLAS DISCOVERY 2019; 25:207-214. [PMID: 31885312 DOI: 10.1177/2472555219897256] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In the last 5 years, cellular thermal shift assay (CETSA), a technology based on ligand-induced changes in protein thermal stability, has been increasingly used in drug discovery to address the fundamental question of whether drug candidates engage their intended target in a biologically relevant setting. To analyze lysates from cells submitted to increasing temperature, the detection and quantification of the remaining soluble protein can be achieved using quantitative mass spectrometry, Western blotting, or AlphaScreen techniques. Still, these approaches can be time- and cell-consuming. To cope with limitations of throughput and protein amount requirements, we developed a new coupled assay combining the advantages of a nanoacoustic transfer system and reverse-phase protein array technology within CETSA experiments. We validated the technology to assess engagement of inhibitors of insulin-degrading enzyme (IDE), an enzyme involved in diabetes and Alzheimer's disease. CETSA-acoustic reverse-phase protein array (CETSA-aRPPA) allows simultaneous analysis of many conditions and drug-target engagement with a small sample size, in a rapid, cost-effective, and biological material-saving manner.
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Affiliation(s)
- Adrien Herledan
- University of Lille, Inserm, Institut Pasteur de Lille, U1177-Drugs and Molecules for Living Systems, Lille, France
| | - Marine Andres
- University of Lille, Inserm, Institut Pasteur de Lille, U1177-Drugs and Molecules for Living Systems, Lille, France.,European Genomic Institute for Diabetes, EGID, University of Lille, Lille, France
| | | | - Florence Leroux
- University of Lille, Inserm, Institut Pasteur de Lille, U1177-Drugs and Molecules for Living Systems, Lille, France.,European Genomic Institute for Diabetes, EGID, University of Lille, Lille, France
| | - Alexandre Biela
- University of Lille, Inserm, Institut Pasteur de Lille, U1177-Drugs and Molecules for Living Systems, Lille, France
| | - Catherine Piveteau
- University of Lille, Inserm, Institut Pasteur de Lille, U1177-Drugs and Molecules for Living Systems, Lille, France
| | - Sandrine Warenghem
- University of Lille, Inserm, Institut Pasteur de Lille, U1177-Drugs and Molecules for Living Systems, Lille, France
| | - Cyril Couturier
- University of Lille, Inserm, Institut Pasteur de Lille, U1177-Drugs and Molecules for Living Systems, Lille, France
| | - Benoit Deprez
- University of Lille, Inserm, Institut Pasteur de Lille, U1177-Drugs and Molecules for Living Systems, Lille, France.,European Genomic Institute for Diabetes, EGID, University of Lille, Lille, France
| | - Rebecca Deprez-Poulain
- University of Lille, Inserm, Institut Pasteur de Lille, U1177-Drugs and Molecules for Living Systems, Lille, France.,European Genomic Institute for Diabetes, EGID, University of Lille, Lille, France.,Institut Universitaire de France (IUF), Paris, France
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44
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Fernández-Díaz CM, Merino B, López-Acosta JF, Cidad P, de la Fuente MA, Lobatón CD, Moreno A, Leissring MA, Perdomo G, Cózar-Castellano I. Pancreatic β-cell-specific deletion of insulin-degrading enzyme leads to dysregulated insulin secretion and β-cell functional immaturity. Am J Physiol Endocrinol Metab 2019; 317:E805-E819. [PMID: 31479304 PMCID: PMC7132327 DOI: 10.1152/ajpendo.00040.2019] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Inhibition of insulin-degrading enzyme (IDE) has been proposed as a possible therapeutic target for type 2 diabetes treatment. However, many aspects of IDE's role in glucose homeostasis need to be clarified. In light of this, new preclinical models are required to elucidate the specific role of this protease in the main tissues related to insulin handling. To address this, here we generated a novel line of mice with selective deletion of the Ide gene within pancreatic beta-cells, B-IDE-KO mice, which have been characterized in terms of multiple metabolic end points, including blood glucose, plasma C-peptide, and intraperitoneal glucose tolerance tests. In addition, glucose-stimulated insulin secretion was quantified in isolated pancreatic islets and beta-cell differentiation markers and insulin secretion machinery were characterized by RT-PCR. Additionally, IDE was genetically and pharmacologically inhibited in INS-1E cells and rodent and human islets, and insulin secretion was assessed. Our results show that, in vivo, life-long deletion of IDE from beta-cells results in increased plasma C-peptide levels. Corroborating these findings, isolated islets from B-IDE-KO mice showed constitutive insulin secretion, a hallmark of beta-cell functional immaturity. Unexpectedly, we found 60% increase in Glut1 (a high-affinity/low-Km glucose transporter), suggesting increased glucose transport into the beta-cell at low glucose levels, which may be related to constitutive insulin secretion. In parallel, IDE inhibition in INS-1E and islet cells resulted in impaired insulin secretion after glucose challenge. We conclude that IDE is required for glucose-stimulated insulin secretion. When IDE is inhibited, insulin secretion machinery is perturbed, causing either inhibition of insulin release at high glucose concentrations or constitutive secretion.
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Affiliation(s)
- Cristina M Fernández-Díaz
- Instituto de Biología y Genética Molecular, Universidad de Valladolid-Consejo Superior de Investigaciones Científicas, Valladolid, Spain
| | - Beatriz Merino
- Instituto de Biología y Genética Molecular, Universidad de Valladolid-Consejo Superior de Investigaciones Científicas, Valladolid, Spain
| | - José F López-Acosta
- Instituto de Biología y Genética Molecular, Universidad de Valladolid-Consejo Superior de Investigaciones Científicas, Valladolid, Spain
| | - Pilar Cidad
- Instituto de Biología y Genética Molecular, Universidad de Valladolid-Consejo Superior de Investigaciones Científicas, Valladolid, Spain
| | - Miguel A de la Fuente
- Instituto de Biología y Genética Molecular, Universidad de Valladolid-Consejo Superior de Investigaciones Científicas, Valladolid, Spain
| | - Carmen D Lobatón
- Instituto de Biología y Genética Molecular, Universidad de Valladolid-Consejo Superior de Investigaciones Científicas, Valladolid, Spain
| | - Alfredo Moreno
- Instituto de Biología y Genética Molecular, Universidad de Valladolid-Consejo Superior de Investigaciones Científicas, Valladolid, Spain
| | - Malcolm A Leissring
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, California
| | - Germán Perdomo
- Departmento de Ciencias de la Salud, Facultad de Ciencias de la Salud, Universidad de Burgos, Burgos, Spain
| | - Irene Cózar-Castellano
- Instituto de Biología y Genética Molecular, Universidad de Valladolid-Consejo Superior de Investigaciones Científicas, Valladolid, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas, Madrid, Spain
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45
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Boutchueng-Djidjou M, Faure RL. Network medicine-travelling with the insulin receptor: Encounter of the second type. EClinicalMedicine 2019; 13:14-20. [PMID: 31517259 PMCID: PMC6734015 DOI: 10.1016/j.eclinm.2019.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 05/08/2019] [Accepted: 07/18/2019] [Indexed: 01/21/2023] Open
Abstract
Important progress has been made in understanding many aspects of insulin action in the last 10 years. Attention will be focused here on the physical protein interaction network of the internalized insulin receptor (IR) and its relationships with the genetic architecture of type 2 diabetes mellitus (T2D). The IR recognizes signals from the outside (circulating insulin) and engages the insulin signaling response. Within seconds, the IR is also involved in insulin internalization and its subsequent degradation in endosomes (physiological clearance of insulin). A T2D disease module sharing functional similarities with insulin secretion in pancreatic islets was recently identified in the close neighborhood of the internalized IR in liver. This module brought a new light on the apparent functional heterogeneity of numerous genes at risk to T2D by linking them to a few noncanonical layers of signaling feedback loops. These findings should be translated into a better understanding of the primary mechanisms of the disease and consequently a more precise sub-classification of T2D, ultimately leading to precision medicine and the development of new therapeutical drugs.
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Affiliation(s)
- Martial Boutchueng-Djidjou
- Départment of Pediatrics, Faculty of Medicine, Laval University, CHU de Québec Research Center, Québec City G1V4G2, Canada
| | - Robert L. Faure
- Centre de Recherche du CHU de Québec, Laboratoire de Biologie Cellulaire, local T3-55 2705, Boulevard Laurier Québec, QC, G1V4G2
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46
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Najjar SM, Perdomo G. Hepatic Insulin Clearance: Mechanism and Physiology. Physiology (Bethesda) 2019; 34:198-215. [PMID: 30968756 DOI: 10.1152/physiol.00048.2018] [Citation(s) in RCA: 120] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Upon its secretion from pancreatic β-cells, insulin reaches the liver through the portal circulation to exert its action and eventually undergo clearance in the hepatocytes. In addition to insulin secretion, hepatic insulin clearance regulates the homeostatic level of insulin that is required to reach peripheral insulin target tissues to elicit proper insulin action. Receptor-mediated insulin uptake followed by its degradation constitutes the basic mechanism of insulin clearance. Upon its phosphorylation by the insulin receptor tyrosine kinase, carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) takes part in the insulin-insulin receptor complex to increase the rate of its endocytosis and targeting to the degradation pathways. This review summarizes how this process is regulated and how it is associated with insulin-degrading enzyme in the liver. It also discusses the physiological implications of impaired hepatic insulin clearance: Whereas reduced insulin clearance cooperates with increased insulin secretion to compensate for insulin resistance, it can also cause hepatic insulin resistance. Because chronic hyperinsulinemia stimulates hepatic de novo lipogenesis, impaired insulin clearance also causes hepatic steatosis. Thus impaired insulin clearance can underlie the link between hepatic insulin resistance and hepatic steatosis. Delineating these regulatory pathways should lead to building more effective therapeutic strategies against metabolic syndrome.
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Affiliation(s)
- Sonia M Najjar
- Department of Biomedical Sciences, Ohio University , Athens, Ohio.,Diabetes Institute, Heritage College of Osteopathic Medicine, Ohio University , Athens, Ohio
| | - Germán Perdomo
- Departamento de Ciencias de la Salud, Universidad de Burgos , Burgos , Spain
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47
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Substrate-selective inhibitors that reprogram the activity of insulin-degrading enzyme. Nat Chem Biol 2019; 15:565-574. [PMID: 31086331 PMCID: PMC6551522 DOI: 10.1038/s41589-019-0271-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 03/14/2019] [Indexed: 11/08/2022]
Abstract
Enzymes that act on multiple substrates are common in biology but pose unique challenges as therapeutic targets. The metalloprotease insulin-degrading enzyme (IDE) modulates blood glucose levels by cleaving insulin, a hormone that promotes glucose clearance. However, IDE also degrades glucagon, a hormone that elevates glucose levels and opposes the effect of insulin. IDE inhibitors to treat diabetes therefore should prevent IDE-mediated insulin degradation, but not glucagon degradation, in contrast with traditional modes of enzyme inhibition. Using a high-throughput screen for non-active-site ligands, we discovered potent and highly specific small-molecule inhibitors that alter IDE’s substrate selectivity. X-ray co-crystal structures, including an IDE-ligand-glucagon ternary complex, revealed substrate-dependent interactions that enable these inhibitors to potently block insulin binding while allowing glucagon cleavage, even at saturating inhibitor concentrations. These findings suggest a path for developing IDE-targeting therapeutics, and offer a blueprint for modulating other enzymes in a substrate-selective manner to unlock their therapeutic potential.
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48
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Peradze N, Farr OM, Mantzoros CS. Research developments in metabolism 2018. Metabolism 2019; 91:70-79. [PMID: 30503805 DOI: 10.1016/j.metabol.2018.11.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 11/15/2018] [Indexed: 12/16/2022]
Affiliation(s)
- Natia Peradze
- Section of Endocrinology, Beth-Israel Deaconess Medical Center/Harvard Medical School, Boston, MA, United States of America.
| | - Olivia M Farr
- Section of Endocrinology, Beth-Israel Deaconess Medical Center/Harvard Medical School, Boston, MA, United States of America
| | - Christos S Mantzoros
- Section of Endocrinology, Beth-Israel Deaconess Medical Center/Harvard Medical School, Boston, MA, United States of America
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