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Listyoko AS, Okazaki R, Harada T, Inui G, Yamasaki A. Impact of obesity on airway remodeling in asthma: pathophysiological insights and clinical implications. FRONTIERS IN ALLERGY 2024; 5:1365801. [PMID: 38562155 PMCID: PMC10982419 DOI: 10.3389/falgy.2024.1365801] [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: 01/05/2024] [Accepted: 03/07/2024] [Indexed: 04/04/2024] Open
Abstract
The prevalence of obesity among asthma patients has surged in recent years, posing a significant risk factor for uncontrolled asthma. Beyond its impact on asthma severity and patients' quality of life, obesity is associated with reduced lung function, increased asthma exacerbations, hospitalizations, heightened airway hyperresponsiveness, and elevated asthma-related mortality. Obesity may lead to metabolic dysfunction and immune dysregulation, fostering chronic inflammation characterized by increased pro-inflammatory mediators and adipocytokines, elevated reactive oxygen species, and reduced antioxidant activity. This chronic inflammation holds the potential to induce airway remodeling in individuals with asthma and obesity. Airway remodeling encompasses structural and pathological changes, involving alterations in the airway's epithelial and subepithelial layers, hyperplasia and hypertrophy of airway smooth muscle, and changes in airway vascularity. In individuals with asthma and obesity, airway remodeling may underlie heightened airway hyperresponsiveness and increased asthma severity, ultimately contributing to the development of persistent airflow limitation, declining lung function, and a potential increase in asthma-related mortality. Despite efforts to address the impact of obesity on asthma outcomes, the intricate mechanisms linking obesity to asthma pathophysiology, particularly concerning airway remodeling, remain incompletely understood. This comprehensive review discusses current research investigating the influence of obesity on airway remodeling, to enhance our understanding of obesity's role in the context of asthma airway remodeling.
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Affiliation(s)
- Aditya Sri Listyoko
- Division of Respiratory Medicine and Rheumatology, Department of Multidisciplinary Internal Medicine, Faculty of Medicine, Tottori University, Yonago, Japan
- Pulmonology and Respiratory Medicine Department, Faculty of Medicine, Brawijaya University-Dr. Saiful Anwar General Hospital, Malang, Indonesia
| | - Ryota Okazaki
- Division of Respiratory Medicine and Rheumatology, Department of Multidisciplinary Internal Medicine, Faculty of Medicine, Tottori University, Yonago, Japan
| | - Tomoya Harada
- Division of Respiratory Medicine and Rheumatology, Department of Multidisciplinary Internal Medicine, Faculty of Medicine, Tottori University, Yonago, Japan
| | - Genki Inui
- Division of Respiratory Medicine and Rheumatology, Department of Multidisciplinary Internal Medicine, Faculty of Medicine, Tottori University, Yonago, Japan
| | - Akira Yamasaki
- Division of Respiratory Medicine and Rheumatology, Department of Multidisciplinary Internal Medicine, Faculty of Medicine, Tottori University, Yonago, Japan
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Farid A, Haridyy H, Ashraf S, Ahmed S, Safwat G. Co-treatment with grape seed extract and mesenchymal stem cells in vivo regenerated beta cells of islets of Langerhans in pancreas of type I-induced diabetic rats. Stem Cell Res Ther 2022; 13:528. [PMID: 36544223 PMCID: PMC9773570 DOI: 10.1186/s13287-022-03218-y] [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: 02/01/2022] [Accepted: 12/08/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Nowadays, diabetes mellitus is known as a silent killer because individual is not aware that he has the disease till the development of its complications. Many researchers have studied the use of stem cells in treatment of both types of diabetes. Mesenchymal stem cells (MSCs) hold a lot of potential for regenerative therapy. MSCs migrate and home at the damaged site, where they can aid in the repair of damaged tissues and restoring their function. Oxidative stress and inflammation represent a huge obstacle during MSCs transplantation. Therefore, the present study aimed to evaluate the role of grape seed extract (GSE) administration during MSCs transplantation in streptozotocin (STZ)-induced type I diabetes. Furthermore, testing some of GSE components [procyanidins(P)-B1 and P-C1] in conjunction with MSCs, in vivo, was performed to determine if one of them was more effective in relieving the measured attributes of diabetes more than the whole GSE. METHODS Firstly, GSE was prepared from the seeds of Muscat of Alexandria grapes and characterized to identify its phytochemical components. Experimental design was composed of control group I, untreated diabetic group II, GSE (300 mg/kg)-treated diabetic group III, MSCs (2 × 106 cells/rat)-treated diabetic group IV and GSE (300 mg/kg)/MSCs (2 × 106 cells/rat)-treated diabetic group V. Type I diabetes was induced in rats by intravenous injection with 65 mg/kg of STZ. Treatment started when fasting blood glucose (FBG) level was more than 200 mg/dl; GSE oral administration started in the same day after MSCs intravenous injection and continued daily for 30 consecutive days. RESULTS The results showed that GSE/MSCs therapy in type I-induced diabetic rats has dramatically managed homeostasis of glucose and insulin secretion; together with, improvement in levels of inflammatory markers and oxidative stress. CONCLUSION Co-treatment with GSE and MSCs in vivo regenerates beta cells in type I-induced diabetic rats.
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Affiliation(s)
- Alyaa Farid
- grid.7776.10000 0004 0639 9286Zoology Department, Faculty of Science, Cairo University, Giza, Egypt ,grid.7776.10000 0004 0639 9286Biotechnology Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Hebatallah Haridyy
- grid.442760.30000 0004 0377 4079Faculty of Biotechnology, October University for Modern Sciences and Arts (MSA), Giza, Egypt
| | - Salma Ashraf
- grid.442760.30000 0004 0377 4079Faculty of Biotechnology, October University for Modern Sciences and Arts (MSA), Giza, Egypt
| | - Selim Ahmed
- grid.442760.30000 0004 0377 4079Faculty of Biotechnology, October University for Modern Sciences and Arts (MSA), Giza, Egypt
| | - Gehan Safwat
- grid.442760.30000 0004 0377 4079Faculty of Biotechnology, October University for Modern Sciences and Arts (MSA), Giza, Egypt
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Lyne R, Bazaga A, Butano D, Contrino S, Heimbach J, Hu F, Kalderimis A, Lyne M, Reierskog K, Stepan R, Sullivan J, Wise A, Yehudi Y, Micklem G. HumanMine: advanced data searching, analysis and cross-species comparison. Database (Oxford) 2022; 2022:6640317. [PMID: 35820040 PMCID: PMC9275753 DOI: 10.1093/database/baac054] [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: 05/11/2022] [Revised: 06/07/2022] [Accepted: 06/21/2022] [Indexed: 11/29/2022]
Abstract
HumanMine (www.humanmine.org) is an integrated database of human genomics and proteomics data that provides a powerful interface to support sophisticated exploration and analysis of data compiled from experimental, computational and curated data sources. Built using the InterMine data integration platform, HumanMine includes genes, proteins, pathways, expression levels, Single nucleotide polymorphism (SNP), diseases and more, integrated into a single searchable database. HumanMine promotes integrative analysis, a powerful approach in modern biology that allows many sources of evidence to be analysed together. The data can be accessed through a user-friendly web interface as well as a powerful, scriptable web service Application programming interface (API) to allow programmatic access to data. The web interface includes a useful identifier resolution system, sophisticated query options and interactive results tables that enable powerful exploration of data, including data summaries, filtering, browsing and export. A set of graphical analysis tools provide a rich environment for data exploration including statistical enrichment of sets of genes or other biological entities. HumanMine can be used for integrative multistaged analysis that can lead to new insights and uncover previously unknown relationships. Database URL: https://www.humanmine.org
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Affiliation(s)
- Rachel Lyne
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Adrián Bazaga
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Daniela Butano
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Sergio Contrino
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Joshua Heimbach
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Fengyuan Hu
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Alexis Kalderimis
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Mike Lyne
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Kevin Reierskog
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Radek Stepan
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Julie Sullivan
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Archie Wise
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Yo Yehudi
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
| | - Gos Micklem
- Department of Genetics, University of Cambridge , Downing Pl, Cambridge, CB2 3EH, UK
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Taurine Grafted Micro-Implants Improved Functions without Direct Dependency between Interleukin-6 and the Bile Acid Lithocholic Acid in Plasma. Biomedicines 2022; 10:biomedicines10010111. [PMID: 35052790 PMCID: PMC8772949 DOI: 10.3390/biomedicines10010111] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/14/2021] [Accepted: 12/21/2021] [Indexed: 01/27/2023] Open
Abstract
A recent study showed an association between diabetes development and the bile acid lithocholic acid (LCA), while another study demonstrated positive biological effects of the conjugated bile acid, taurocholic acid (TCA), on pancreatic cells. Thus, this study aimed to encapsulate TCA with primary islets (graft) and study the biological effects of the graft, post-transplantation, in diabetic mice, including effects on LCA concentrations. Sixteen mature adult mice were made diabetic and randomly divided into two equal groups, control and test (transplanted encapsulated islets without or with TCA). Graft pharmaceutical features pre-transplantation, and biological effects including on LCA concentrations post-transplantation, were measured. TCA-microcapsules had an oval shape and similar size compared with the control. The treatment group survived longer, showed improved glucose and interleukin-6 concentrations, and lower LCA concentrations in plasma, large intestine, faeces, liver and spleen, compared with control. Results suggest that TCA incorporation with islets encapsulated graft exerted beneficial effects, but there was no direct and significant dependency between concentrations of interleukin-6 and LCA.
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Mahmoud MF, Abdelaal S, Mohammed HO, El-Shazly AM, Daoud R, Abdelfattah MAO, Sobeh M. Syzygium aqueum (Burm.f.) Alston Prevents Streptozotocin-Induced Pancreatic Beta Cells Damage via the TLR-4 Signaling Pathway. Front Pharmacol 2021; 12:769244. [PMID: 34912223 PMCID: PMC8667316 DOI: 10.3389/fphar.2021.769244] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 10/25/2021] [Indexed: 11/23/2022] Open
Abstract
Although several treatments are available for the treatment of type 2 diabetes mellitus, adverse effects and cost burden impose the search for safe, efficient, and cost-effective alternative herbal remedies. Syzygium aqueum (Burm.f.) Alston, a natural anti-inflammatory, antioxidant herb, may suppress diabetes-associated inflammation and pancreatic beta-cell death. Here, we tested the ability of the bioactive leaf extract (SA) to prevent streptozotocin (STZ)-induced oxidative stress and inflammation in pancreatic beta cells in rats and the involvement of the TLR-4 signaling pathway. Non-fasted rats pretreated with 100 or 200 mg kg-1 SA 2 days prior to the STZ challenge and for 14 days later had up to 52 and 39% reduction in the glucose levels, respectively, while glibenclamide, the reference standard drug (0.5 mg kg-1), results in 70% reduction. Treatment with SA extract was accompanied by increased insulin secretion, restoration of Langerhans islets morphology, and decreased collagen deposition as demonstrated from ELISA measurement, H and E, and Mallory staining. Both glibenclamide and SA extract significantly decreased levels of TLR-4, MYD88, pro-inflammatory cytokines TNF-α, and TRAF-6 in pancreatic tissue homogenates, which correlated well with minimal pancreatic inflammatory cell infiltration. Pre-treatment with SA or glibenclamide decreased malondialdehyde, a sensitive biomarker of ROS-induced lipid peroxidation, and restored depleted reduced glutathione in the pancreas. Altogether, these data indicate that S. aqueum is effective in improving STZ-induced pancreatic damage, which could be beneficial in treating type 2 diabetes mellitus.
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Affiliation(s)
- Mona F. Mahmoud
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Shimaa Abdelaal
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Heba Osama Mohammed
- Department of Human Anatomy and Embryology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Assem M. El-Shazly
- Department of Pharmacognosy, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Rachid Daoud
- African Genome Center, Mohammed VI Polytechnic University, Ben Guerir, Morocco
| | | | - Mansour Sobeh
- AgroBioSciences, Mohammed VI Polytechnic University, Ben Guerir, Morocco
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Inflammatory Response, a Key Pathophysiological Mechanism of Obesity-Induced Depression. Mediators Inflamm 2020; 2020:8893892. [PMID: 33299381 PMCID: PMC7707993 DOI: 10.1155/2020/8893892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 11/17/2020] [Accepted: 11/18/2020] [Indexed: 12/12/2022] Open
Abstract
In recent years, with the acceleration of life rhythm and the increase of social competition, the incidence of obesity and depression has been increasing, which has seriously affected the quality of life and health of people. Obesity and depression, two seemingly unrelated physical and psychological diseases, in fact, are closely related: obese people are more likely to have depression than nonobese ones. We have reviewed and analyzed the relevant research literature and found that the inflammatory response plays a key role in obesity-induced depression. This article will discuss in detail the inflammatory mechanisms by which obesity induces depression.
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7
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Possible Prevention of Diabetes with a Gluten-Free Diet. Nutrients 2018; 10:nu10111746. [PMID: 30428550 PMCID: PMC6266002 DOI: 10.3390/nu10111746] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 11/06/2018] [Accepted: 11/07/2018] [Indexed: 02/07/2023] Open
Abstract
Gluten seems a potentially important determinant in type 1 diabetes (T1D) and type 2 diabetes (T2D). Intake of gluten, a major component of wheat, rye, and barley, affects the microbiota and increases the intestinal permeability. Moreover, studies have demonstrated that gluten peptides, after crossing the intestinal barrier, lead to a more inflammatory milieu. Gluten peptides enter the pancreas where they affect the morphology and might induce beta-cell stress by enhancing glucose- and palmitate-stimulated insulin secretion. Interestingly, animal studies and a human study have demonstrated that a gluten-free (GF) diet during pregnancy reduces the risk of T1D. Evidence regarding the role of a GF diet in T2D is less clear. Some studies have linked intake of a GF diet to reduced obesity and T2D and suggested a role in reducing leptin- and insulin-resistance and increasing beta-cell volume. The current knowledge indicates that gluten, among many environmental factors, may be an aetiopathogenic factors for development of T1D and T2D. However, human intervention trials are needed to confirm this and the proposed mechanisms.
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He W, Rebello O, Savino R, Terracciano R, Schuster-Klein C, Guardiola B, Maedler K. TLR4 triggered complex inflammation in human pancreatic islets. Biochim Biophys Acta Mol Basis Dis 2018; 1865:86-97. [PMID: 30287405 DOI: 10.1016/j.bbadis.2018.09.030] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 09/06/2018] [Accepted: 09/20/2018] [Indexed: 02/08/2023]
Abstract
Type 2 Diabetes (T2D) is strongly associated with obesity and inflammation. Toll-like receptor-4 (TLR-4) is the major pro-inflammatory pathway with its ligands and downstream products increased systemically in T2D and in at-risk individuals. Detailed mechanisms of the complex proinflammatory response in pancreatic islets remain unknown. In isolated human islets LPS induced IL-1β, IL-6, IL-8 and TNF production in a TLR4-dependent manner and severely impaired β-cell survival and function. IL-6 antagonism improved β-cell function. IL-8, which was identified specifically in α-cells, initiated monocyte migration, a process fully blocked by IL-8 neutralization. The TLR4 response was potentiated in obese donors; with higher IL-1β, IL-6 and IL-8 expression than in non-obese donors. TLR4 activation leads to a complex multi-cellular inflammatory response in human islets, which involves β-cell failure, cytokine production and macrophage recruitment to islets. In obesity, the amplified TLR4 response may potentiate β-cell damage and accelerate diabetes progression.
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Affiliation(s)
- Wei He
- University of Bremen, Center for Biomolecular Interactions Bremen, Germany.
| | - Osmond Rebello
- University of Bremen, Center for Biomolecular Interactions Bremen, Germany
| | - Rocco Savino
- Department of Health Sciences, Magna Graecia University, Catanzaro, Italy
| | - Rosa Terracciano
- Department of Health Sciences, Magna Graecia University, Catanzaro, Italy
| | | | | | - Kathrin Maedler
- University of Bremen, Center for Biomolecular Interactions Bremen, Germany.
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Effect of barley supplementation on the fecal microbiota, caecal biochemistry, and key biomarkers of obesity and inflammation in obese db/db mice. Eur J Nutr 2017; 57:2513-2528. [DOI: 10.1007/s00394-017-1523-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 08/06/2017] [Indexed: 12/25/2022]
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10
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Senturk B, Demircan BM, Ozkan AD, Tohumeken S, Delibasi T, Guler MO, Tekinay AB. Diabetic wound regeneration using heparin-mimetic peptide amphiphile gel in db/db mice. Biomater Sci 2017; 5:1293-1303. [DOI: 10.1039/c7bm00251c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
There is an urgent need for more efficient treatment of chronic wounds in diabetic patients especially with a high risk of leg amputation.
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Affiliation(s)
- Berna Senturk
- Institute of Materials Science and Nanotechnology
- National Nanotechnology Research Center (UNAM)
- Bilkent University
- Ankara, 06800
- Turkey
| | | | - Alper D. Ozkan
- Institute of Materials Science and Nanotechnology
- National Nanotechnology Research Center (UNAM)
- Bilkent University
- Ankara, 06800
- Turkey
| | - Sehmus Tohumeken
- Institute of Materials Science and Nanotechnology
- National Nanotechnology Research Center (UNAM)
- Bilkent University
- Ankara, 06800
- Turkey
| | - Tuncay Delibasi
- ADACELL Cell Therapy
- Regenerative Medicine and Research Hospital Etlik Polyclinic
- Department of Endocrinology and Metabolism
- Ankara, 06010
- Turkey
| | - Mustafa O. Guler
- Institute of Materials Science and Nanotechnology
- National Nanotechnology Research Center (UNAM)
- Bilkent University
- Ankara, 06800
- Turkey
| | - Ayse B. Tekinay
- Institute of Materials Science and Nanotechnology
- National Nanotechnology Research Center (UNAM)
- Bilkent University
- Ankara, 06800
- Turkey
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Charles EF, Lambert CG, Kerner B. Bipolar disorder and diabetes mellitus: evidence for disease-modifying effects and treatment implications. Int J Bipolar Disord 2016; 4:13. [PMID: 27389787 PMCID: PMC4936996 DOI: 10.1186/s40345-016-0054-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 05/18/2016] [Indexed: 02/13/2023] Open
Abstract
BACKGROUND Bipolar disorder refers to a group of chronic psychiatric disorders of mood and energy levels. While dramatic psychiatric symptoms dominate the acute phase of the diseases, the chronic course is often determined by an increasing burden of co-occurring medical conditions. High rates of diabetes mellitus in patients with bipolar disorder are particularly striking, yet unexplained. Treatment and lifestyle factors could play a significant role, and some studies also suggest shared pathophysiology and risk factors. OBJECTIVE In this systematic literature review, we explored data around the relationship between bipolar disorder and diabetes mellitus in recently published population-based cohort studies with special focus on the elderly. METHODS A systematic search in the PubMed database for the combined terms "bipolar disorder" AND "elderly" AND "diabetes" in papers published between January 2009 and December 2015 revealed 117 publications; 7 studies were large cohort studies, and therefore, were included in our review. RESULTS We found that age- and gender- adjusted risk for diabetes mellitus was increased in patients with bipolar disorder and vice versa (odds ratio range between 1.7 and 3.2). DISCUSSION Our results in large population-based cohort studies are consistent with the results of smaller studies and chart reviews. Even though it is likely that heterogeneous risk factors may play a role in diabetes mellitus and in bipolar disorder, growing evidence from cell culture experiments and animal studies suggests shared disease mechanisms. Furthermore, disease-modifying effects of bipolar disorder and diabetes mellitus on each other appear to be substantial, impacting both treatment response and outcomes. CONCLUSIONS The risk of diabetes mellitus in patients with bipolar disorder is increased. Our findings add to the growing literature on this topic. Increasing evidence for shared disease mechanisms suggests new disease models that could explain the results of our study. A better understanding of the complex relationship between bipolar disorder and diabetes mellitus could lead to novel therapeutic approaches and improved outcomes.
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Affiliation(s)
- Ellen F. Charles
- />David Geffen School of Medicine, University of California, Los Angeles, 10833 Le Conte Ave, Los Angeles, CA 90095 USA
| | - Christophe G. Lambert
- />Center for Global Health, Division of Translational Informatics, Department of Internal Medicine, University of New Mexico Health Sciences Center, University of New Mexico, MSC10 5550, Albuquerque, NM 87131 USA
| | - Berit Kerner
- />Semel Institute for Neuroscience and Human Behavior, University of California, 695 Charles E. Young Drive South, Box 951761, Los Angeles, CA 90095 USA
- />Fakultät für Gesundheit, Private Universität Witten/Herdecke, Alfred-Herrhausen-Straße 50, 58448 Witten, Germany
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Haupt-Jorgensen M, Buschard K, Hansen AK, Josefsen K, Antvorskov JC. Gluten-free diet increases beta-cell volume and improves glucose tolerance in an animal model of type 2 diabetes. Diabetes Metab Res Rev 2016; 32:675-684. [PMID: 26991675 DOI: 10.1002/dmrr.2802] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 02/10/2016] [Accepted: 02/22/2016] [Indexed: 11/05/2022]
Abstract
BACKGROUND Gluten-free (GF) diet alleviates type 1 diabetes in animal models and possibly in humans. We recently showed that fatty acid-induced insulin secretion is enhanced by enzymatically digested gluten (gliadin) stimulation in INS-1E insulinoma cells. We therefore hypothesized that GF diet would induce beta-cell rest and ameliorate type 2 diabetes. METHODS C57BL/6JBomTac (B6) mice were fed a high-fat (HF), gluten-free high-fat (GF-HF), standard (STD) or gluten-free (GF) diet for 42 weeks. RESULTS Short-term (6-24 weeks) GF-HF versus HF feeding impaired glucose tolerance and increased fasting glucose. Long-term (36-42 weeks) GF-HF versus HF feeding improved glucose tolerance and decreased fasting leptin. Mice fed a GF-HF versus HF diet for 42 weeks showed higher volumes of beta cells, islets and pancreas. The beta-cell volume correlated with the islet- and pancreas volume as well as body weight. GF-HF versus HF diet did not influence toll-like receptor 4 (Tlr4), interleukin 1 (IL-1), interleukin 6 (IL-6) or tumour necrosis factor-alpha (TNF-alpha) mRNA expression in intestine. STD versus GF feeding did not affect any parameter studied. CONCLUSIONS Long-term feeding with GF-HF versus HF increases beta-cell volume and improves glucose tolerance in B6 mice. The mechanism may include beta-cell rest, but is unlikely to include TLR4 and proinflammatory cytokines in the intestine. Beta-cell volume correlates with pancreas volume and body weight, indicating that insulin secretion capacity controls pancreas volume. Thus, long-term GF diets may be beneficial for obese type 2 diabetes patients and trials should be performed. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
| | | | - Axel K Hansen
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Knud Josefsen
- The Bartholin Institute, Rigshospitalet, Copenhagen, Denmark
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Naqvi AR, Zhong S, Dang H, Fordham JB, Nares S, Khan A. Expression Profiling of LPS Responsive miRNA in Primary Human Macrophages. ACTA ACUST UNITED AC 2016; 8:136-143. [PMID: 27307950 PMCID: PMC4905593 DOI: 10.4172/1948-5948.1000276] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
microRNAs (miRNAs) have emerged as important regulators of the innate and adaptive immune response. The purpose of the present study was to interrogate miRNA profiles of primary human macrophages challenged with bacterial lipopolysaccharide (LPS) with focus on expression kinetics. We employed Nanostring platform to precisely characterize the changes in miRNA expression following different doses and durations of LPS exposure. Differentially expressed miRNAs were identified in response to LPS challenge with convergent and divergent expression profiles. Pathway analysis of LPS-responsive miRNAs revealed regulation of biological processes linked to key cell signaling (including PIK3-Akt, MAP kinase, ErbB) and pathogen response pathways. Our data provide a comprehensive miRNA profiling of human primary macrophages treated with LPS. These results show that bacterial Toll like receptor (TLR) ligands can temporally modulate macrophage miRNA expression.
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Affiliation(s)
- Afsar Raza Naqvi
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, USA
| | - Sheng Zhong
- Department of Endodontics, Center for Pain Research and Innovation, School of Dentistry, University of North Carolina, USA
| | - Hong Dang
- Cystic Fibrosis/Pulmonary Research and Treatment Center, Marisco Lung Institute, University of North Carolina, USA
| | - Jezrom B Fordham
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, USA
| | - Salvador Nares
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, USA
| | - Asma Khan
- Department of Endodontics, Center for Pain Research and Innovation, School of Dentistry, University of North Carolina, USA
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14
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Dodson MV, Allen RE, Du M, Bergen WG, Velleman SG, Poulos SP, Fernyhough-Culver M, Wheeler MB, Duckett SK, Young MRI, Voy BH, Jiang Z, Hausman GJ. INVITED REVIEW: Evolution of meat animal growth research during the past 50 years: Adipose and muscle stem cells. J Anim Sci 2016; 93:457-81. [PMID: 26020737 DOI: 10.2527/jas.2014-8221] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
If one were to compare today's animal growth research to research from a mere 50 yr ago, one would see programs with few similarities. The evolution of this research from whole-animal through cell-based and finally molecular and genomic studies has been enhanced by the identification, isolation, and in vitro evaluation of adipose- and muscle-derived stem cells. This paper will highlight the struggles and the milestones that make this evolving area of research what it is today. The contribution of adipose and muscle stem cell research to development and growth, tissue regeneration, and final carcass composition are reviewed.
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Matrine pretreatment improves cardiac function in rats with diabetic cardiomyopathy via suppressing ROS/TLR-4 signaling pathway. Acta Pharmacol Sin 2015; 36:323-33. [PMID: 25619390 DOI: 10.1038/aps.2014.127] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 10/14/2014] [Indexed: 01/04/2023] Open
Abstract
AIM Matrine is an alkaloid from Sophora alopecuroides L, which has shown a variety of pharmacological activities and potential therapeutic value in cardiovascular diseases. In this study we examined the protective effects of matrine against diabetic cardiomyopathy (DCM) in rats. METHODS Male SD rats were injected with streptozotocin (STZ) to induce DCM. One group of DCM rats was pretreated with matrine (200 mg·kg(-1)·d(-1), po) for 10 consecutive days before STZ injection. Left ventricular function was evaluated using invasive hemodynamic examination, and myocardiac apoptosis was assessed. Primary rat myocytes were used for in vitro experiments. Intracellular ROS generation, MDA content and GPx activity were determined. Real-time PCR and Western blotting were performed to detect the expression of relevant mRNAs and proteins. RESULTS DCM rats exhibited abnormally elevated non-fasting blood glucose levels at 4 weeks after STZ injection, and LV function impairment at 16 weeks. The cardiac tissues of DCM rats showed markedly increased apoptosis, excessive ROS production, and activation of TLR-4/MyD-88/caspase-8/caspase-3 signaling. Pretreatment with matrine significantly decreased non-fasting blood glucose levels and improved LV function in DCM rats, which were associated with reducing apoptosis and ROS production, and suppressing TLR-4/MyD-88/caspase-8/caspase-3 signaling in cardiac tissues. Incubation in a high-glucose medium induced oxidative stress and activation of TLR-4/MyD-88 signaling in cultured myocytes in vitro, which were significantly attenuated by pretreatment with N-acetylcysteine. CONCLUSION Excessive ROS production in DCM activates the TLR-4/MyD-88 signaling, resulting in cardiomyocyte apoptosis, whereas pretreatment with matrine improves cardiac function via suppressing ROS/TLR-4 signaling pathway.
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Cao Y, Bao S, Yang W, Zhang J, Li L, Shan Z, Teng W. Epigallocatechin gallate prevents inflammation by reducing macrophage infiltration and inhibiting tumor necrosis factor-α signaling in the pancreas of rats on a high-fat diet. Nutr Res 2014; 34:1066-74. [DOI: 10.1016/j.nutres.2014.10.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 09/30/2014] [Accepted: 10/10/2014] [Indexed: 01/26/2023]
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Chow SZ, Speck M, Yoganathan P, Nackiewicz D, Hansen AM, Ladefoged M, Rabe B, Rose-John S, Voshol PJ, Lynn FC, Herrera PL, Müller W, Ellingsgaard H, Ehses JA. Glycoprotein 130 receptor signaling mediates α-cell dysfunction in a rodent model of type 2 diabetes. Diabetes 2014; 63:2984-95. [PMID: 24812426 DOI: 10.2337/db13-1121] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Dysregulated glucagon secretion accompanies islet inflammation in type 2 diabetes. We recently discovered that interleukin (IL)-6 stimulates glucagon secretion from human and rodent islets. IL-6 family cytokines require the glycoprotein 130 (gp130) receptor to signal. In this study, we elucidated the effects of α-cell gp130 receptor signaling on glycemic control in type 2 diabetes. IL-6 family cytokines were elevated in islets in rodent models of this disease. gp130 receptor activation increased STAT3 phosphorylation in primary α-cells and stimulated glucagon secretion. Pancreatic α-cell gp130 knockout (αgp130KO) mice showed no differences in glycemic control, α-cell function, or α-cell mass. However, when subjected to streptozotocin plus high-fat diet to induce islet inflammation and pathophysiology modeling type 2 diabetes, αgp130KO mice had reduced fasting glycemia, improved glucose tolerance, reduced fasting insulin, and improved α-cell function. Hyperinsulinemic-euglycemic clamps revealed no differences in insulin sensitivity. We conclude that in a setting of islet inflammation and pathophysiology modeling type 2 diabetes, activation of α-cell gp130 receptor signaling has deleterious effects on α-cell function, promoting hyperglycemia. Antagonism of α-cell gp130 receptor signaling may be useful for the treatment of type 2 diabetes.
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Affiliation(s)
- Samuel Z Chow
- Department of Surgery, Faculty of Medicine, University of British Columbia, Child and Family Research Institute, Vancouver, British Columbia, Canada
| | - Madeleine Speck
- Department of Surgery, Faculty of Medicine, University of British Columbia, Child and Family Research Institute, Vancouver, British Columbia, Canada
| | - Piriya Yoganathan
- Department of Surgery, Faculty of Medicine, University of British Columbia, Child and Family Research Institute, Vancouver, British Columbia, Canada
| | - Dominika Nackiewicz
- Department of Surgery, Faculty of Medicine, University of British Columbia, Child and Family Research Institute, Vancouver, British Columbia, Canada
| | | | | | - Björn Rabe
- Institute of Biochemistry, Medical Faculty, Christian Albrechts University of Kiel, Kiel, Germany
| | - Stefan Rose-John
- Institute of Biochemistry, Medical Faculty, Christian Albrechts University of Kiel, Kiel, Germany
| | - Peter J Voshol
- Institute of Metabolic Science, University of Cambridge Metabolic Research Laboratories and National Institute for Health Research Biomedical Research Centre, Addenbrooke's Hospital, Cambridge, U.K
| | - Francis C Lynn
- Department of Surgery, Faculty of Medicine, University of British Columbia, Child and Family Research Institute, Vancouver, British Columbia, Canada
| | - Pedro L Herrera
- Department of Genetic Medicine and Development, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Werner Müller
- Faculty of Life Sciences, University of Manchester, Manchester, U.K
| | - Helga Ellingsgaard
- The Centre of Inflammation and Metabolism and the Centre for Physical Activity Research, Department of Infectious Diseases, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Jan A Ehses
- Department of Surgery, Faculty of Medicine, University of British Columbia, Child and Family Research Institute, Vancouver, British Columbia, Canada
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Balistreri CR, Bonfigli AR, Boemi M, Olivieri F, Ceriello A, Genovese S, Franceschi C, Spazzafumo L, Fabietti P, Candore G, Caruso C, Lio D, Testa R. Evidences of +896 A/G TLR4 polymorphism as an indicative of prevalence of complications in T2DM patients. Mediators Inflamm 2014; 2014:973139. [PMID: 24803744 PMCID: PMC3996297 DOI: 10.1155/2014/973139] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 03/06/2014] [Indexed: 01/08/2023] Open
Abstract
T2DM is today considered as world-wide health problem, with complications responsible of an enhanced mortality and morbidity. Thus, new strategies for its prevention and therapy are necessary. For this reason, the research interest has focused its attention on TLR4 and its polymorphisms, particularly the rs4986790. However, no conclusive findings have been reported until now about the role of this polymorphism in development of T2DM and its complications, even if a recent meta-analysis showed its T2DM association in Caucasians. In this study, we sought to evaluate the weight of rs4986790 polymorphism in the risk of the major T2DM complications, including 367 T2DM patients complicated for the 55.6%. Patients with A/A and A/G TLR4 genotypes showed significant differences in complication's prevalence. In particular, AG carriers had higher risk prevalence for neuropathy (P = 0.026), lower limb arteriopathy (P = 0.013), and the major cardiovascular pathologies (P = 0.017). Their cumulative risk was significant (P = 0.01), with a threefold risk to develop neuropathy, lower limb arteriopathy, and major cardiovascular events in AG cases compared to AA cases. The adjusted OR for the confounding variables was 3.788 (95% CI: 1.642-8.741). Thus, the rs4986790 polymorphism may be an indicative of prevalence of complications in T2DM patients.
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Affiliation(s)
- Carmela Rita Balistreri
- Department of Pathobiology and Medical and Forensic Biotechnologies, University of Palermo, Tukory's Street 211, 90134 Palermo, Italy
| | - Anna Rita Bonfigli
- Metabolic Diseases and Diabetology Unit, Italian National Research Center on Aging (INRCA), Ancona, Italy
| | - Massimo Boemi
- Metabolic Diseases and Diabetology Unit, Italian National Research Center on Aging (INRCA), Ancona, Italy
| | - Fabiola Olivieri
- Department of Clinical and Molecular Sciences, Università Politecnica delle Marche, Ancona, Italy
- Center of Clinical Pathology and Innovative Therapy, Italian National Research Center on Aging (INRCA), Ancona, Italy
| | - Antonio Ceriello
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Barcelona, Spain
| | - Stefano Genovese
- Department of Cardiovascular and Metabolic Diseases, IRCCS Gruppo Multimedica, Sesto San Giovanni (MI), Italy
| | - Claudio Franceschi
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), University of Bologna, CNR-ISOF and IRCCS Neuroscience, Bologna, Italy
| | - Liana Spazzafumo
- Biostatistical Center, Italian National Research Center on Aging (INRCA), Ancona, Italy
| | - Paolo Fabietti
- Biostatistical Center, Italian National Research Center on Aging (INRCA), Ancona, Italy
| | - Giuseppina Candore
- Department of Pathobiology and Medical and Forensic Biotechnologies, University of Palermo, Tukory's Street 211, 90134 Palermo, Italy
| | - Calogero Caruso
- Department of Pathobiology and Medical and Forensic Biotechnologies, University of Palermo, Tukory's Street 211, 90134 Palermo, Italy
| | - Domenico Lio
- Department of Pathobiology and Medical and Forensic Biotechnologies, University of Palermo, Tukory's Street 211, 90134 Palermo, Italy
| | - Roberto Testa
- Experimental Models in Clinical Pathology, Italian National Research Center on Aging (INRCA), Ancona, Italy
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Cucak H, Mayer C, Tonnesen M, Thomsen LH, Grunnet LG, Rosendahl A. Macrophage contact dependent and independent TLR4 mechanisms induce β-cell dysfunction and apoptosis in a mouse model of type 2 diabetes. PLoS One 2014; 9:e90685. [PMID: 24594974 PMCID: PMC3940939 DOI: 10.1371/journal.pone.0090685] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Accepted: 02/03/2014] [Indexed: 12/21/2022] Open
Abstract
Type 2 diabetes (T2D) is evolving into a global disease and patients have a systemic low-grade inflammation, yet the role of this inflammation is still not established. One plausible mechanism is enhanced expression and activity of the innate immune system. Therefore, we evaluated the expression and the function of the toll-like receptor 4 (TLR4) on pancreatic β-cells in primary mouse islets and on the murine β-cell line MIN6 in the presence or absence of macrophages. Diabetic islets have 40% fewer TLR4 positive β-cells, but twice the number of TLR4 positive macrophages as compared to healthy islets. Healthy and diabetic islets respond to a TLR4 challenge with enhanced production of cytokines (5–10-fold), while the TLR4 negative β-cell line MIN6 fails to produce cytokines. TLR4 stimulation induces β-cell dysfunction in mouse islets, measured as reduced glucose stimulated insulin secretion. Diabetic macrophages from 4-months old mice have acquired a transient enhanced capacity to produce cytokines when stimulated with LPS. Interestingly, this is lost in 6-months old diabetic mice. TLR4 activation alone does not induce apoptosis in islets or MIN-6 cells. In contrast, macrophages mediate TLR4-dependent cell-contact dependent (3-fold) as well as cell-contact independent (2-fold) apoptosis of both islets and MIN-6 cells. Importantly, diabetic macrophages have a significantly enhanced capacity to induce β-cell apoptosis compared to healthy macrophages. Taken together, the TLR4 responsiveness is elevated in the diabetic islets and mainly mediated by newly recruited macrophages. The TLR4 positive macrophages, in both a cell-contact dependent and independent manner, induce apoptosis of β-cells in a TLR4 dependent fashion and TLR4 activation directly induces β-cell dysfunction. Thus, targeting either the TLR4 pathway or the macrophages provides a novel attractive treatment regime for T2D.
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Affiliation(s)
- Helena Cucak
- Hagedorn Research Institute, Department of Diabetic Complication Biology, Måløv, Denmark
| | - Christopher Mayer
- Hagedorn Research Institute, Department of Diabetic Complication Biology, Måløv, Denmark
| | - Morten Tonnesen
- Hagedorn Research Institute, Department of Diabetic Complication Biology, Måløv, Denmark
| | - Lise Høj Thomsen
- Hagedorn Research Institute, Department of Diabetic Complication Biology, Måløv, Denmark
| | | | - Alexander Rosendahl
- Hagedorn Research Institute, Department of Diabetic Complication Biology, Måløv, Denmark
- * E-mail:
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Hussey SE, Lum H, Alvarez A, Cipriani Y, Garduño-Garcia J, Anaya L, Dube J, Musi N. A sustained increase in plasma NEFA upregulates the Toll-like receptor network in human muscle. Diabetologia 2014; 57:582-91. [PMID: 24337154 PMCID: PMC3945433 DOI: 10.1007/s00125-013-3111-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 10/30/2013] [Indexed: 01/04/2023]
Abstract
AIMS/HYPOTHESIS Insulin-sensitive tissues (muscle, liver) of individuals with obesity and type 2 diabetes mellitus are in a state of low-grade inflammation, characterised by increased Toll-like receptor (TLR) expression and TLR-driven signalling. However, the cause of this mild inflammatory state is unclear. We tested the hypothesis that a prolonged mild increase in plasma NEFA will increase TLR expression and TLR-driven signalling (nuclear factor κB [NFκB] and mitogen-activated kinase [MAPK]) and impair insulin action in muscle of lean healthy individuals. METHODS Twelve lean, normal-glucose-tolerant participants were randomised to receive a 48 h infusion (30 ml/h) of saline or Intralipid followed by a euglycaemic-hyperinsulinaemic clamp. Vastus lateralis muscle biopsies were performed before and during the clamp. RESULTS Lipid infusion impaired insulin-stimulated IRS-1 tyrosine phosphorylation and reduced peripheral insulin sensitivity (p < 0.01). The elevation in circulating NEFA increased expression of TLR3, TLR4 and TLR5, and several MAPK (MAPK8, MAP4K4, MAP2K3) and inhibitor of κB kinase-NFκB (CHUK [IKKA], c-REL [REL] and p65 [RELA, NFKB3, p65]) signalling genes (p < 0.05). The lipid infusion also increased extracellular signal-regulated kinase (ERK) phosphorylation (p < 0.05) and tended to reduce the content of inhibitor of kappa Bα (p = 0.09). The muscle content of most diacylglycerol, ceramide and acylcarnitine species was unaffected. In summary, insulin resistance induced by prolonged low-dose lipid infusion occurs together with increased TLR-driven inflammatory signalling and impaired insulin-stimulated IRS-1 tyrosine phosphorylation. CONCLUSIONS/INTERPRETATION A sustained, mild elevation in plasma NEFA is sufficient to increase TLR expression and TLR-driven signalling (NFκB and MAPK) in lean individuals. The activation of this pathway by NEFA may be involved in the pathogenesis of insulin resistance in humans. TRIAL REGISTRATION ClinicalTrials.gov NCT01740817.
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Affiliation(s)
- Sophie E Hussey
- Department of Medicine-Diabetes Division, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA
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21
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Toll-like receptors and NLRP3 as central regulators of pancreatic islet inflammation in type 2 diabetes. Immunol Cell Biol 2014; 92:314-23. [PMID: 24492799 DOI: 10.1038/icb.2014.4] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Revised: 01/03/2014] [Accepted: 01/06/2014] [Indexed: 12/17/2022]
Abstract
The global health and economic burden of type 2 diabetes (T2D) has reached staggering proportions. Current projections estimate that 592 million people will have diabetes by 2035. T2D-which comprises 90% of cases-is a complex disease, in most cases resulting from a combination of predisposing genes and an unhealthy environment. Clinical onset of the disease occurs when pancreatic β cells fail in the face of insulin resistance. It has long been appreciated that chronic activation of the innate immune system is associated with T2D, and many organs critical to the regulation of glucose homeostasis show signs of a chronic inflammatory process, including the pancreatic islets of Langerhans. Recent clinical trials using IL-1-targeting agents have confirmed that inflammation contributes to β-cell failure in humans with T2D. However, little is known about the nature of the pro-inflammatory response within the islet, and there is considerable debate about the triggers for islet inflammation, which may be systemically derived and/or tissue-specific. In this review, we present evidence that Toll-like receptors 2 and 4 and the NLRP3 (Nucleotide-binding oligomerization domain, Leucine-rich Repeat and Pyrin domain containing 3) inflammasome are triggers for islet inflammation in T2D and propose that the activation of macrophages by these triggers mediates islet endocrine cell dysfunction. Therapeutically targeting these receptors may improve hyperglycemia and protect the β cell in T2D.
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22
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Pae EK, Ahuja B, Kim M, Kim G. Impaired glucose homeostasis after a transient intermittent hypoxic exposure in neonatal rats. Biochem Biophys Res Commun 2013; 441:637-42. [PMID: 24183722 DOI: 10.1016/j.bbrc.2013.10.102] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 10/19/2013] [Indexed: 11/17/2022]
Abstract
This initial report presents a neonatal rat model with exposure to a transient intermittent hypoxia (IH), which results in a persisting diabetes-like condition in the young rats. Twenty-five male pups were treated at postnatal day 1 with IH exposure by alternating the level of oxygen between 10.3% and 20.8% for 5h. The treated animals were then maintained in normal ambient oxygen condition for 3 week and compared to age-matched controls. The IH treated animals exhibited a significantly higher fasting glucose level than the control animals (237.00 ± 19.66 mg/dL vs. 167.25 ± 2.95 mg/dL; P=0.003); and a significantly lower insulin level than the control (807.0 ± 72.5 pg/mL vs. 1839.8 ± 377.6 pg/mL; P=0.023). There was no difference in the mass or the number of insulin producing beta cells as well as no indicative of inflammatory changes; however, glucose tolerance tests showed a significantly disturbed glucose homeostasis. In addition, the amount of C-peptide secreted from the islets harvested from the IH animals were decreased significantly (from 914 pM in control to 809 pM in IH; P=0.0006) as well. These observations demonstrate that the neonatal exposure to the IH regimen initiates the development of deregulation in glucose homeostasis without infiltration of inflammatory cells.
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Affiliation(s)
- Eung-Kwon Pae
- UCLA, School of Dentistry, LA, CA 90095, United States.
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23
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Yin XL, Lu WN, Feng LY. Role of LPS/TLR4 signaling pathway in nonalcoholic fatty liver disease. Shijie Huaren Xiaohua Zazhi 2013; 21:2957-2962. [DOI: 10.11569/wcjd.v21.i28.2957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The LPS/TLR4 signaling pathway is involved in the pathogenesis of nonalcoholic fatty liver disease. The up-regulation of expression of LPS receptor TLR4 induces inflammatory response and promotes liver cell damage in nonalcoholic fatty liver disease. When nonalcoholic fatty liver disease occurs, disordered intestinal bacterial growth leads to increased production of LPS and increased permeability of the intestinal wall and therefore induces intestinal endotoxemia. Via MyD88-dependent and -independent pathways, LPS up-regulates the expression of TLR4 in Kupffer cells, activates NF-kB, induces strong inflammatory responses and mediates liver injury. This review aims to elucidate the role of the LPS/TLR4 signaling pathway in nonalcoholic fatty liver disease.
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Adipocytes as immune regulatory cells. Int Immunopharmacol 2013; 16:224-31. [PMID: 23587489 DOI: 10.1016/j.intimp.2013.04.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 04/01/2013] [Accepted: 04/01/2013] [Indexed: 12/30/2022]
Abstract
Obesity is a chronic inflammatory state and adipocytes are capable of contributing to this inflammation by their production of inflammatory mediators. The present study used fibroblast-derived adipocytes and normal spleen cells as a model to determine if adipocytes can also serve as immune regulatory cells by modulating the functions of conventional immune cells. Media conditioned by the adipocytes stimulated release of the Th1-type cytokines IL-2, IFN-γ and GM-CSF from cultures of normal spleen cells. The adipocytes also stimulated spleen cell release of inhibitory cytokines, although to varying degrees. This included IL-10, IL-13 and, to a lesser extent, IL-4. Spleen cell production of the inflammatory cytokines IL-6, TNF-α and IL-9 was stimulated by adipocytes, although production of the Th17-derived cytokine, IL-17, was not stimulated. The adipocyte-conditioned medium did not stimulate production of predominantly monocytes-derived chemokines CXCL9, CCL2, CCL3, CCL4, but stimulated production of the predominantly T-cell-derived chemokine CCL5. In all cases where cytokine/chemokine production from spleen cells was stimulated by adipocytes, it was to a far greater level than was produced by the adipocytes themselves. Studies initiated to determine the identity of the adipocyte-derived mediators showed that the spleen cell modulation could not be attributed to solely adiponectin or leptin. Studies to determine the source of some of the cytokines whose production was stimulated by adipocytes showed that expression of the inflammatory cytokine IL-6 was not increased in either CD4(+) or CD8(+) T-cell. When the splenic T-cells were examined for IFN-γ, the adipocyte stimulation of IFN-γ was within CD8(+) T-cells, not CD4(+) T-cells. These studies show that adipocytes may be able to serve as immune regulatory cells to stimulate conventional immune cells to release a spectrum of immune mediators.
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Lucas K, Maes M. Role of the Toll Like receptor (TLR) radical cycle in chronic inflammation: possible treatments targeting the TLR4 pathway. Mol Neurobiol 2013; 48:190-204. [PMID: 23436141 PMCID: PMC7091222 DOI: 10.1007/s12035-013-8425-7] [Citation(s) in RCA: 334] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2012] [Accepted: 02/05/2013] [Indexed: 12/11/2022]
Abstract
Activation of the Toll-like receptor 4 (TLR4) complex, a receptor of the innate immune system, may underpin the pathophysiology of many human diseases, including asthma, cardiovascular disorder, diabetes, obesity, metabolic syndrome, autoimmune disorders, neuroinflammatory disorders, schizophrenia, bipolar disorder, autism, clinical depression, chronic fatigue syndrome, alcohol abuse, and toluene inhalation. TLRs are pattern recognition receptors that recognize damage-associated molecular patterns and pathogen-associated molecular patterns, including lipopolysaccharide (LPS) from gram-negative bacteria. Here we focus on the environmental factors, which are known to trigger TLR4, e.g., ozone, atmosphere particulate matter, long-lived reactive oxygen intermediate, pentachlorophenol, ionizing radiation, and toluene. Activation of the TLR4 pathways may cause chronic inflammation and increased production of reactive oxygen and nitrogen species (ROS/RNS) and oxidative and nitrosative stress and therefore TLR-related diseases. This implies that drugs or substances that modify these pathways may prevent or improve the abovementioned diseases. Here we review some of the most promising drugs and agents that have the potential to attenuate TLR-mediated inflammation, e.g., anti-LPS strategies that aim to neutralize LPS (synthetic anti-LPS peptides and recombinant factor C) and TLR4/MyD88 antagonists, including eritoran, CyP, EM-163, epigallocatechin-3-gallate, 6-shogaol, cinnamon extract, N-acetylcysteine, melatonin, and molecular hydrogen. The authors posit that activation of the TLR radical (ROS/RNS) cycle is a common pathway underpinning many "civilization" disorders and that targeting the TLR radical cycle may be an effective method to treat many inflammatory disorders.
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Affiliation(s)
- Kurt Lucas
- Sportzenkoppel 54, 22359, Hamburg, Germany
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