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Salignon J, Faridani OR, Miliotis T, Janssens GE, Chen P, Zarrouki B, Sandberg R, Davidsson P, Riedel CG. Age prediction from human blood plasma using proteomic and small RNA data: a comparative analysis. Aging (Albany NY) 2023; 15:5240-5265. [PMID: 37341993 PMCID: PMC10333066 DOI: 10.18632/aging.204787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 05/26/2023] [Indexed: 06/22/2023]
Abstract
Aging clocks, built from comprehensive molecular data, have emerged as promising tools in medicine, forensics, and ecological research. However, few studies have compared the suitability of different molecular data types to predict age in the same cohort and whether combining them would improve predictions. Here, we explored this at the level of proteins and small RNAs in 103 human blood plasma samples. First, we used a two-step mass spectrometry approach measuring 612 proteins to select and quantify 21 proteins that changed in abundance with age. Notably, proteins increasing with age were enriched for components of the complement system. Next, we used small RNA sequencing to select and quantify a set of 315 small RNAs that changed in abundance with age. Most of these were microRNAs (miRNAs), downregulated with age, and predicted to target genes related to growth, cancer, and senescence. Finally, we used the collected data to build age-predictive models. Among the different types of molecules, proteins yielded the most accurate model (R² = 0.59 ± 0.02), followed by miRNAs as the best-performing class of small RNAs (R² = 0.54 ± 0.02). Interestingly, the use of protein and miRNA data together improved predictions (R2 = 0.70 ± 0.01). Future work using larger sample sizes and a validation dataset will be necessary to confirm these results. Nevertheless, our study suggests that combining proteomic and miRNA data yields superior age predictions, possibly by capturing a broader range of age-related physiological changes. It will be interesting to determine if combining different molecular data types works as a general strategy to improve future aging clocks.
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Affiliation(s)
- Jérôme Salignon
- Department of Medicine, Integrated Cardio Metabolic Centre (ICMC), Karolinska Institutet, Huddinge 14157, Sweden
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge 14157, Sweden
| | - Omid R. Faridani
- Department of Medicine, Integrated Cardio Metabolic Centre (ICMC), Karolinska Institutet, Huddinge 14157, Sweden
- Lowy Cancer Research Centre, School of Medical Sciences, University of New South Wales, Sydney, Australia
- Garvan Institute of Medical Research, Sydney, Australia
| | - Tasso Miliotis
- Translational Science and Experimental Medicine, Research and Early Development, Cardiovascular, Renal and Metabolism, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Georges E. Janssens
- Department of Medicine, Integrated Cardio Metabolic Centre (ICMC), Karolinska Institutet, Huddinge 14157, Sweden
| | - Ping Chen
- Department of Medicine, Integrated Cardio Metabolic Centre (ICMC), Karolinska Institutet, Huddinge 14157, Sweden
| | - Bader Zarrouki
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal and Metabolism, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Rickard Sandberg
- Department of Medicine, Integrated Cardio Metabolic Centre (ICMC), Karolinska Institutet, Huddinge 14157, Sweden
- Department of Cellular and Molecular Biology, Ludwig Institute for Cancer Research, Karolinska Institutet, Solna 17165, Sweden
| | - Pia Davidsson
- Translational Science and Experimental Medicine, Research and Early Development, Cardiovascular, Renal and Metabolism, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Christian G. Riedel
- Department of Medicine, Integrated Cardio Metabolic Centre (ICMC), Karolinska Institutet, Huddinge 14157, Sweden
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge 14157, Sweden
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Nag A, Dhindsa RS, Mitchell J, Vasavda C, Harper AR, Vitsios D, Ahnmark A, Bilican B, Madeyski-Bengtson K, Zarrouki B, Zoghbi AW, Wang Q, Smith KR, Alegre-Díaz J, Kuri-Morales P, Berumen J, Tapia-Conyer R, Emberson J, Torres JM, Collins R, Smith DM, Challis B, Paul DS, Bohlooly-Y M, Snowden M, Baker D, Fritsche-Danielson R, Pangalos MN, Petrovski S. Human genetics uncovers MAP3K15 as an obesity-independent therapeutic target for diabetes. Sci Adv 2022; 8:eadd5430. [PMID: 36383675 PMCID: PMC9668288 DOI: 10.1126/sciadv.add5430] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 09/27/2022] [Indexed: 05/30/2023]
Abstract
We performed collapsing analyses on 454,796 UK Biobank (UKB) exomes to detect gene-level associations with diabetes. Recessive carriers of nonsynonymous variants in MAP3K15 were 30% less likely to develop diabetes (P = 5.7 × 10-10) and had lower glycosylated hemoglobin (β = -0.14 SD units, P = 1.1 × 10-24). These associations were independent of body mass index, suggesting protection against insulin resistance even in the setting of obesity. We replicated these findings in 96,811 Admixed Americans in the Mexico City Prospective Study (P < 0.05)Moreover, the protective effect of MAP3K15 variants was stronger in individuals who did not carry the Latino-enriched SLC16A11 risk haplotype (P = 6.0 × 10-4). Separately, we identified a Finnish-enriched MAP3K15 protein-truncating variant associated with decreased odds of both type 1 and type 2 diabetes (P < 0.05) in FinnGen. No adverse phenotypes were associated with protein-truncating MAP3K15 variants in the UKB, supporting this gene as a therapeutic target for diabetes.
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Affiliation(s)
- Abhishek Nag
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | - Ryan S. Dhindsa
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Waltham, MA, USA
| | - Jonathan Mitchell
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | - Chirag Vasavda
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Waltham, MA, USA
| | - Andrew R. Harper
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | - Dimitrios Vitsios
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | - Andrea Ahnmark
- Bioscience Metabolism, Early CVRM, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Bilada Bilican
- Discovery Biology, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Katja Madeyski-Bengtson
- Discovery Biology, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Bader Zarrouki
- Bioscience Metabolism, Early CVRM, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Anthony W. Zoghbi
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Waltham, MA, USA
| | - Quanli Wang
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Waltham, MA, USA
| | - Katherine R. Smith
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | - Jesus Alegre-Díaz
- Faculty of Medicine, National Autonomous University of Mexico, Copilco Universidad, Coyoacán, 4360 Ciudad de México, Mexico
| | - Pablo Kuri-Morales
- Faculty of Medicine, National Autonomous University of Mexico, Copilco Universidad, Coyoacán, 4360 Ciudad de México, Mexico
| | - Jaime Berumen
- Faculty of Medicine, National Autonomous University of Mexico, Copilco Universidad, Coyoacán, 4360 Ciudad de México, Mexico
| | - Roberto Tapia-Conyer
- Faculty of Medicine, National Autonomous University of Mexico, Copilco Universidad, Coyoacán, 4360 Ciudad de México, Mexico
| | - Jonathan Emberson
- Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, England, UK
| | - Jason M. Torres
- Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, England, UK
| | - Rory Collins
- Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, England, UK
| | - David M. Smith
- Emerging Innovations, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | - Benjamin Challis
- Translational Science and Experimental Medicine, Early CVRM, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | - Dirk S. Paul
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | - Mohammad Bohlooly-Y
- Discovery Biology, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Mike Snowden
- Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | - David Baker
- Bioscience Metabolism, Early CVRM, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
| | | | | | - Slavé Petrovski
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge, UK
- Department of Medicine, University of Melbourne, Austin Health, Melbourne, Victoria, Australia
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Kroon T, Hagstedt T, Alexandersson I, Ferm A, Petersson M, Maurer S, Zarrouki B, Wallenius K, Oakes ND, Boucher J. Chronotherapy with a glucokinase activator profoundly improves metabolism in obese Zucker rats. Sci Transl Med 2022; 14:eabh1316. [DOI: 10.1126/scitranslmed.abh1316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Circadian rhythms play a critical role in regulating metabolism, including daily cycles of feeding/fasting. Glucokinase (GCK) is central for whole-body glucose homeostasis and oscillates according to a circadian clock. GCK activators (GKAs) effectively reduce hyperglycemia, but their use is also associated with hypoglycemia, hyperlipidemia, and hepatic steatosis. Given the circadian rhythmicity and natural postprandial activation of GCK, we hypothesized that GKA treatment would benefit from being timed specifically during feeding periods. Acute treatment of obese Zucker rats with the GKA AZD1656 robustly increased flux into all major metabolic pathways of glucose disposal, enhancing glucose elimination. Four weeks of continuous AZD1656 treatment of obese Zucker rats improved glycemic control; however, hepatic steatosis and inflammation manifested. In contrast, timing AZD1656 to feeding periods robustly reduced hepatic steatosis and inflammation in addition to improving glycemia, whereas treatment timed to fasting periods caused overall detrimental metabolic effects. Mechanistically, timing AZD1656 to feeding periods diverted newly synthesized lipid toward direct VLDL secretion rather than intrahepatic storage. In line with increased hepatic insulin signaling, timing AZD1656 to feeding resulted in robust activation of AKT, mTOR, and SREBP-1C after glucose loading, pathways known to regulate VLDL secretion and hepatic de novo lipogenesis. In conclusion, intermittent AZD1656 treatment timed to feeding periods promotes glucose disposal when needed the most, restores metabolic flexibility and hepatic insulin sensitivity, and thereby avoids hepatic steatosis. Thus, chronotherapeutic approaches may benefit the development of GKAs and other drugs acting on metabolic targets.
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Affiliation(s)
- Tobias Kroon
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal, and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
- Lundberg Laboratory for Diabetes Research, University of Gothenburg, Gothernburg 41345, Sweden
- Wallenberg Centre for Molecular and Translational Medicine, University of Gothenburg, Gothernburg 40530 Sweden
| | - Therese Hagstedt
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal, and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Ida Alexandersson
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal, and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Annett Ferm
- Animal Sciences and Technologies, Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Marie Petersson
- Animal Sciences and Technologies, Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Stefanie Maurer
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal, and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Bader Zarrouki
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal, and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Kristina Wallenius
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal, and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Nicholas D. Oakes
- Functional and Mechanistic Safety, Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Jeremie Boucher
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal, and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
- Lundberg Laboratory for Diabetes Research, University of Gothenburg, Gothernburg 41345, Sweden
- Wallenberg Centre for Molecular and Translational Medicine, University of Gothenburg, Gothernburg 40530 Sweden
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O’Mahony G, Petersen J, Ek M, Rae R, Johansson C, Jianming L, Prokoph N, Bergström F, Bamberg K, Giordanetto F, Zarrouki B, Karlsson D, Hogner A. Discovery by Virtual Screening of an Inhibitor of CDK5-Mediated PPARγ Phosphorylation. ACS Med Chem Lett 2022; 13:681-686. [PMID: 35450368 PMCID: PMC9014497 DOI: 10.1021/acsmedchemlett.1c00715] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 03/08/2022] [Indexed: 12/18/2022] Open
Abstract
Thiazolidinedione PPARγ agonists such as rosiglitazone and pioglitazone are effective antidiabetic drugs, but side effects have limited their use. It has been posited that their positive antidiabetic effects are mainly mediated by the inhibition of the CDK5-mediated Ser273 phosphorylation of PPARγ, whereas the side effects are linked to classical PPARγ agonism. Thus compounds that inhibit PPARγ Ser273 phosphorylation but lack classical PPARγ agonism have been sought as safer antidiabetic therapies. Herein we report the discovery by virtual screening of 10, which is a potent PPARγ binder and in vitro inhibitor of the CDK5-mediated phosphorylation of PPARγ Ser273 and displays negligible PPARγ agonism in a reporter gene assay. The pharmacokinetic properties of 10 are compatible with oral dosing, enabling preclinical in vivo testing, and a 7 day treatment demonstrated an improvement in insulin sensitivity in the ob/ob diabetic mouse model.
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Affiliation(s)
- Gavin O’Mahony
- Medicinal Chemistry, Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Jens Petersen
- Mechanistic and Structural Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Margareta Ek
- Mechanistic and Structural Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Rebecca Rae
- Advanced Drug Delivery, Pharmaceutical Sciences, R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Carina Johansson
- Mechanistic and Structural Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Liu Jianming
- Discovery Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Nina Prokoph
- Discovery Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Fredrik Bergström
- DMPK, Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Krister Bamberg
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Fabrizio Giordanetto
- Medicinal Chemistry, Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Bader Zarrouki
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Daniel Karlsson
- Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
| | - Anders Hogner
- Medicinal Chemistry, Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg 43183, Sweden
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Soulage CO, Sardón Puig L, Soulère L, Zarrouki B, Guichardant M, Lagarde M, Pillon NJ. Skeletal muscle insulin resistance is induced by 4-hydroxy-2-hexenal, a by-product of n-3 fatty acid peroxidation. Diabetologia 2018; 61:688-699. [PMID: 29299636 PMCID: PMC6448972 DOI: 10.1007/s00125-017-4528-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 11/17/2017] [Indexed: 01/25/2023]
Abstract
AIMS/HYPOTHESIS Oxidative stress is involved in the pathophysiology of insulin resistance and its progression towards type 2 diabetes. The peroxidation of n-3 polyunsaturated fatty acids produces 4-hydroxy-2-hexenal (4-HHE), a lipid aldehyde with potent electrophilic properties able to interfere with many pathophysiological processes. The aim of the present study was to investigate the role of 4-HHE in the development of insulin resistance. METHODS 4-HHE concentration was measured in plasma from humans and rats by GC-MS. Insulin resistance was estimated in healthy rats after administration of 4-HHE using hyperinsulinaemic-euglycaemic clamps. In muscle cells, glucose uptake was measured using 2-deoxy-D-glucose and signalling pathways were investigated by western blotting. Intracellular glutathione was measured using a fluorimetric assay kit and boosted using 1,2-dithiole-3-thione (D3T). RESULTS Circulating levels of 4-HHE in type 2 diabetic humans and a rat model of diabetes (obese Zucker diabetic fatty rats), were twice those in their non-diabetic counterparts (33 vs 14 nmol/l, p < 0.001), and positively correlated with blood glucose levels. During hyperinsulinaemic-euglycaemic clamps in rats, acute intravenous injection of 4-HHE significantly altered whole-body insulin sensitivity and decreased glucose infusion rate (24.2 vs 9.9 mg kg-1 min-1, p < 0.001). In vitro, 4-HHE impaired insulin-stimulated glucose uptake and signalling (protein kinase B/Akt and IRS1) in L6 muscle cells. Insulin-induced glucose uptake was reduced from 186 to 141.9 pmol mg-1 min-1 (p < 0.05). 4-HHE induced carbonylation of cell proteins and reduced glutathione concentration from 6.3 to 4.5 nmol/mg protein. Increasing intracellular glutathione pools using D3T prevented 4-HHE-induced carbonyl stress and insulin resistance. CONCLUSIONS/INTERPRETATION 4-HHE is produced in type 2 diabetic humans and Zucker diabetic fatty rats and blunts insulin action in skeletal muscle. 4-HHE therefore plays a causal role in the pathophysiology of type 2 diabetes and might constitute a potential therapeutic target to taper oxidative stress-induced insulin resistance.
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Affiliation(s)
- Christophe O Soulage
- Univ Lyon, CarMeN, INSA-Lyon, Inserm UMR 1060, INRA UMR 1397, Université Claude Bernard Lyon 1, Villeurbanne, France
| | - Laura Sardón Puig
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
| | - Laurent Soulère
- Univ Lyon, INSA-Lyon, CPE Lyon, Université de Lyon 1, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, Chimie Organique et Bioorganique (COB), Villeurbanne, France
| | - Bader Zarrouki
- Bioscience Diabetes, Cardiovascular and Metabolic Diseases, IMED Biotech Unit, AstraZeneca, Gothenburg, Sweden
| | - Michel Guichardant
- Univ Lyon, CarMeN, INSA-Lyon, Inserm UMR 1060, INRA UMR 1397, Université Claude Bernard Lyon 1, Villeurbanne, France
| | - Michel Lagarde
- Univ Lyon, CarMeN, INSA-Lyon, Inserm UMR 1060, INRA UMR 1397, Université Claude Bernard Lyon 1, Villeurbanne, France
| | - Nicolas J Pillon
- Department of Physiology and Pharmacology, Karolinska Institutet, von Eulers väg 4a, IV, SE-171 77, Stockholm, Sweden.
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Moullé VS, Vivot K, Tremblay C, Zarrouki B, Ghislain J, Poitout V. Glucose and fatty acids synergistically and reversibly promote beta cell proliferation in rats. Diabetologia 2017; 60:879-888. [PMID: 28078385 PMCID: PMC5376373 DOI: 10.1007/s00125-016-4197-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 12/08/2016] [Indexed: 12/31/2022]
Abstract
AIMS/HYPOTHESIS The mechanisms underlying pancreatic islet mass expansion have attracted considerable interest as potential therapeutic targets to prevent or delay the onset of type 2 diabetes. While several factors promoting beta cell proliferation have been identified, in the context of nutrient excess the roles of glucose or NEFA in relation to insulin resistance remain unclear. Here we tested the hypothesis that glucose and NEFA synergistically and reversibly promote beta cell proliferation in the context of nutrient-induced insulin resistance. METHODS Using 72 h infusions of glucose (GLU) or the oleate-enriched lipid emulsion ClinOleic (CLI), singly or in combination, we assessed beta cell proliferation, islet mass and insulin sensitivity in male Lewis rats. The effects of nutrients and endogenous circulating factors were examined in isolated and transplanted islets. Reversibility was studied 3 and 6 days after the end of the infusion. RESULTS GLU infusions modestly stimulated beta cell proliferation, CLI alone had no effect and GLU+CLI infusions markedly stimulated beta cell proliferation. Insulin sensitivity was equally decreased in GLU and GLU+CLI infusions. GLU+CLI infusions also stimulated beta cell proliferation in islets transplanted under the kidney capsule, albeit to a lesser extent compared with endogenous islets. Ex vivo, the combination of glucose and NEFA enhanced beta cell proliferation in rat and human islets independently from secreted insulin, and serum from GLU+CLI-infused rats potentiated the effect of glucose. Glucose tolerance, beta cell proliferation and islet mass were all restored to normal levels 6 days after termination of the infusion. CONCLUSIONS/INTERPRETATION Glucose and NEFA synergistically and reversibly promote beta cell proliferation in part via direct action on the beta cell and independently from secreted insulin.
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Affiliation(s)
- Valentine S Moullé
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- The University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, Montreal, QC, H2X 0A9, Canada
| | - Kevin Vivot
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- The University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, Montreal, QC, H2X 0A9, Canada
| | - Caroline Tremblay
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- The University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, Montreal, QC, H2X 0A9, Canada
| | - Bader Zarrouki
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- The University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, Montreal, QC, H2X 0A9, Canada
| | - Julien Ghislain
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- The University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, Montreal, QC, H2X 0A9, Canada
| | - Vincent Poitout
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada.
- The University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, Montreal, QC, H2X 0A9, Canada.
- Department of Medicine, University of Montreal, Montreal, QC, Canada.
- Department of Biochemistry and Molecular Medicine, University of Montreal, Montreal, QC, Canada.
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7
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Vivot K, Moullé VS, Zarrouki B, Tremblay C, Mancini AD, Maachi H, Ghislain J, Poitout V. The regulator of G-protein signaling RGS16 promotes insulin secretion and β-cell proliferation in rodent and human islets. Mol Metab 2016; 5:988-996. [PMID: 27689011 PMCID: PMC5034687 DOI: 10.1016/j.molmet.2016.08.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 08/12/2016] [Accepted: 08/16/2016] [Indexed: 01/04/2023] Open
Abstract
Objective G protein-coupled receptor (GPCR) signaling regulates insulin secretion and pancreatic β cell-proliferation. While much knowledge has been gained regarding how GPCRs are activated in β cells, less is known about the mechanisms controlling their deactivation. In many cell types, termination of GPCR signaling is controlled by the family of Regulators of G-protein Signaling (RGS). RGS proteins are expressed in most eukaryotic cells and ensure a timely return to the GPCR inactive state upon removal of the stimulus. The aims of this study were i) to determine if RGS16, the most highly enriched RGS protein in β cells, regulates insulin secretion and β-cell proliferation and, if so, ii) to elucidate the mechanisms underlying such effects. Methods Mouse and human islets were infected with recombinant adenoviruses expressing shRNA or cDNA sequences to knock-down or overexpress RGS16, respectively. 60 h post-infection, insulin secretion and cAMP levels were measured in static incubations in the presence of glucose and various secretagogues. β-cell proliferation was measured in infected islets after 72 h in the presence of 16.7 mM glucose ± somatostatin and various inhibitors. Results RGS16 mRNA levels are strongly up-regulated in islets of Langerhans under hyperglycemic conditions in vivo and ex vivo. RGS16 overexpression stimulated glucose-induced insulin secretion in isolated mouse and human islets while, conversely, insulin secretion was impaired following RGS16 knock-down. Insulin secretion was no longer affected by RGS16 knock-down when islets were pre-treated with pertussis toxin to inactivate Gαi/o proteins, or in the presence of a somatostatin receptor antagonist. RGS16 overexpression increased intracellular cAMP levels, and its effects were blocked by an adenylyl cyclase inhibitor. Finally, RGS16 overexpression prevented the inhibitory effect of somatostatin on insulin secretion and β-cell proliferation. Conclusions Our results identify RGS16 as a novel regulator of β-cell function that coordinately controls insulin secretion and proliferation by limiting the tonic inhibitory signal exerted by δ-cell-derived somatostatin in islets. RGS16 is up-regulated under hyperglycemic conditions in islets. RGS16 is a key regulator of insulin secretion and β-cell proliferation. RGS16 attenuates Gαi/o protein activity downstream of δ-cell derived SST.
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Affiliation(s)
- Kevin Vivot
- Montreal Diabetes Research Center, CRCHUM, Montréal, QC, H2X 0A9, Canada
| | - Valentine S Moullé
- Montreal Diabetes Research Center, CRCHUM, Montréal, QC, H2X 0A9, Canada
| | - Bader Zarrouki
- Montreal Diabetes Research Center, CRCHUM, Montréal, QC, H2X 0A9, Canada
| | - Caroline Tremblay
- Montreal Diabetes Research Center, CRCHUM, Montréal, QC, H2X 0A9, Canada
| | - Arturo D Mancini
- Montreal Diabetes Research Center, CRCHUM, Montréal, QC, H2X 0A9, Canada
| | - Hasna Maachi
- Montreal Diabetes Research Center, CRCHUM, Montréal, QC, H2X 0A9, Canada; Department of Pharmacology, Université de Montréal, Montréal, QC, H3T 1J4, Canada
| | - Julien Ghislain
- Montreal Diabetes Research Center, CRCHUM, Montréal, QC, H2X 0A9, Canada
| | - Vincent Poitout
- Montreal Diabetes Research Center, CRCHUM, Montréal, QC, H2X 0A9, Canada; Department of Pharmacology, Université de Montréal, Montréal, QC, H3T 1J4, Canada; Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, QC, H3T 1J4, Canada; Department of Medicine, Université de Montréal, Montréal, QC, H3T 1J4, Canada.
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8
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Fontés G, Ghislain J, Benterki I, Zarrouki B, Trudel D, Berthiaume Y, Poitout V. The ΔF508 Mutation in the Cystic Fibrosis Transmembrane Conductance Regulator Is Associated With Progressive Insulin Resistance and Decreased Functional β-Cell Mass in Mice. Diabetes 2015; 64:4112-22. [PMID: 26283735 PMCID: PMC4876763 DOI: 10.2337/db14-0810] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Accepted: 08/10/2015] [Indexed: 01/20/2023]
Abstract
Cystic fibrosis (CF) is the result of mutations in the cystic fibrosis transmembrane conductance regulator (CFTR). CF-related diabetes affects 50% of adult CF patients. How CFTR deficiency predisposes to diabetes is unknown. Herein, we examined the impact of the most frequent cftr mutation in humans, deletion of phenylalanine at position 508 (ΔF508), on glucose homeostasis in mice. We compared ΔF508 mutant mice with wild-type (WT) littermates. Twelve-week-old male ΔF508 mutants had lower body weight, improved oral glucose tolerance, and a trend toward higher insulin tolerance. Glucose-induced insulin secretion was slightly diminished in ΔF508 mutant islets, due to reduced insulin content, but ΔF508 mutant islets were not more sensitive to proinflammatory cytokines than WT islets. Hyperglycemic clamps confirmed an increase in insulin sensitivity with normal β-cell function in 12- and 18-week-old ΔF508 mutants. In contrast, 24-week-old ΔF508 mutants exhibited insulin resistance and reduced β-cell function. β-Cell mass was unaffected at 11 weeks of age but was significantly lower in ΔF508 mutants versus controls at 24 weeks. This was not associated with gross pancreatic pathology. We conclude that the ΔF508 CFTR mutation does not lead to an intrinsic β-cell secretory defect but is associated with insulin resistance and a β-cell mass deficit in aging mutants.
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Affiliation(s)
- Ghislaine Fontés
- Montreal Diabetes Research Center, University of Montreal, Quebec, Canada University of Montreal Hospital Research Centre, University of Montreal, Montreal, Quebec, Canada
| | - Julien Ghislain
- Montreal Diabetes Research Center, University of Montreal, Quebec, Canada University of Montreal Hospital Research Centre, University of Montreal, Montreal, Quebec, Canada
| | - Isma Benterki
- Montreal Diabetes Research Center, University of Montreal, Quebec, Canada University of Montreal Hospital Research Centre, University of Montreal, Montreal, Quebec, Canada Department of Biochemistry and Molecular Medicine, University of Montreal, Montreal, Quebec, Canada
| | - Bader Zarrouki
- Montreal Diabetes Research Center, University of Montreal, Quebec, Canada University of Montreal Hospital Research Centre, University of Montreal, Montreal, Quebec, Canada
| | - Dominique Trudel
- University of Montreal Hospital Research Centre, University of Montreal, Montreal, Quebec, Canada Department of Pathology and Cell Biology, University of Montreal, Montreal, Quebec, Canada
| | - Yves Berthiaume
- University of Montreal Hospital Research Centre, University of Montreal, Montreal, Quebec, Canada Department of Medicine, University of Montreal, Montreal, Quebec, Canada
| | - Vincent Poitout
- Montreal Diabetes Research Center, University of Montreal, Quebec, Canada University of Montreal Hospital Research Centre, University of Montreal, Montreal, Quebec, Canada Department of Biochemistry and Molecular Medicine, University of Montreal, Montreal, Quebec, Canada Department of Medicine, University of Montreal, Montreal, Quebec, Canada
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9
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Vella RE, Pillon NJ, Zarrouki B, Croze ML, Koppe L, Guichardant M, Pesenti S, Chauvin MA, Rieusset J, Géloën A, Soulage CO. Ozone exposure triggers insulin resistance through muscle c-Jun N-terminal kinase activation. Diabetes 2015; 64:1011-24. [PMID: 25277399 DOI: 10.2337/db13-1181] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A growing body of evidence suggests that exposure to traffic-related air pollution is a risk factor for type 2 diabetes. Ozone, a major photochemical pollutant in urban areas, is negatively associated with fasting glucose and insulin levels, but most aspects of this association remain to be elucidated. Using an environmentally realistic concentration (0.8 parts per million), we demonstrated that exposure of rats to ozone induced whole-body insulin resistance and oxidative stress, with associated endoplasmic reticulum (ER) stress, c-Jun N-terminal kinase (JNK) activation, and disruption of insulin signaling in skeletal muscle. Bronchoalveolar lavage fluids from ozone-treated rats reproduced this effect in C2C12 myotubes, suggesting that toxic lung mediators were responsible for the phenotype. Pretreatment with the chemical chaperone 4-phenylbutyric acid, the JNK inhibitor SP600125, or the antioxidant N-acetylcysteine alleviated insulin resistance, demonstrating that ozone sequentially triggered oxidative stress, ER stress, and JNK activation to impair insulin signaling in muscle. This study is the first to report that ozone plays a causative role in the development of insulin resistance, suggesting that it could boost the development of diabetes. We therefore provide a potential mechanism linking pollutant exposure and the increased incidence of metabolic diseases.
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Affiliation(s)
- Roxane E Vella
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France Institut National des Sciences Appliquées de Lyon, Multi-disciplinary Institute of Lipid Biochemistry (IMBL), Villeurbanne, France
| | - Nicolas J Pillon
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France Institut National des Sciences Appliquées de Lyon, Multi-disciplinary Institute of Lipid Biochemistry (IMBL), Villeurbanne, France
| | - Bader Zarrouki
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France Institut National des Sciences Appliquées de Lyon, Multi-disciplinary Institute of Lipid Biochemistry (IMBL), Villeurbanne, France
| | - Marine L Croze
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France Institut National des Sciences Appliquées de Lyon, Multi-disciplinary Institute of Lipid Biochemistry (IMBL), Villeurbanne, France
| | - Laetitia Koppe
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France Institut National des Sciences Appliquées de Lyon, Multi-disciplinary Institute of Lipid Biochemistry (IMBL), Villeurbanne, France
| | - Michel Guichardant
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France Institut National des Sciences Appliquées de Lyon, Multi-disciplinary Institute of Lipid Biochemistry (IMBL), Villeurbanne, France
| | - Sandra Pesenti
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France
| | - Marie-Agnès Chauvin
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France
| | - Jennifer Rieusset
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France
| | - Alain Géloën
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France Institut National des Sciences Appliquées de Lyon, Multi-disciplinary Institute of Lipid Biochemistry (IMBL), Villeurbanne, France
| | - Christophe O Soulage
- Université de Lyon, Oullins, France Institut National de la Santé et de la Recherche Médicale, UMR 1060 CarMeN, Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition, Villeurbanne, France Institut National des Sciences Appliquées de Lyon, Multi-disciplinary Institute of Lipid Biochemistry (IMBL), Villeurbanne, France
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10
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Zarrouki B, Benterki I, Fontés G, Peyot ML, Seda O, Prentki M, Poitout V. Epidermal growth factor receptor signaling promotes pancreatic β-cell proliferation in response to nutrient excess in rats through mTOR and FOXM1. Diabetes 2014; 63:982-93. [PMID: 24194502 PMCID: PMC3931394 DOI: 10.2337/db13-0425] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The cellular and molecular mechanisms underpinning the compensatory increase in β-cell mass in response to insulin resistance are essentially unknown. We previously reported that a 72-h coinfusion of glucose and Intralipid (GLU+IL) induces insulin resistance and a marked increase in β-cell proliferation in 6-month-old, but not in 2-month-old, Wistar rats. The aim of the current study was to identify the mechanisms underlying nutrient-induced β-cell proliferation in this model. A transcriptomic analysis identified a central role for the forkhead transcription factor FOXM1 and its targets, and for heparin-binding epidermal growth factor (EGF)-like growth factor (HB-EGF), a ligand of the EGF receptor (EGFR), in nutrient-induced β-cell proliferation. Phosphorylation of ribosomal S6 kinase, a mammalian target of rapamycin (mTOR) target, was increased in islets from GLU+IL-infused 6-month-old rats. HB-EGF induced proliferation of insulin-secreting MIN6 cells and isolated rat islets, and this effect was blocked in MIN6 cells by the EGFR inhibitor AG1478 or the mTOR inhibitor rapamycin. Coinfusion of either AG1478 or rapamycin blocked the increase in FOXM1 signaling, β-cell proliferation, and β-cell mass and size in response to GLU+IL infusion in 6-month-old rats. We conclude that chronic nutrient excess promotes β-cell mass expansion via a pathway that involves EGFR signaling, mTOR activation, and FOXM1-mediated cell proliferation.
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Affiliation(s)
- Bader Zarrouki
- Montreal Diabetes Research Center, University of Montréal, Montréal, Québec, Canada
- University of Montréal Hospital Research Centre, Montréal, Québec, Canada
- Department of Medicine, University of Montréal, Montréal, Québec, Canada
| | - Isma Benterki
- Montreal Diabetes Research Center, University of Montréal, Montréal, Québec, Canada
- University of Montréal Hospital Research Centre, Montréal, Québec, Canada
- Department of Biochemistry, University of Montréal, Montréal, Québec, Canada
| | - Ghislaine Fontés
- Montreal Diabetes Research Center, University of Montréal, Montréal, Québec, Canada
- University of Montréal Hospital Research Centre, Montréal, Québec, Canada
| | - Marie-Line Peyot
- Montreal Diabetes Research Center, University of Montréal, Montréal, Québec, Canada
- University of Montréal Hospital Research Centre, Montréal, Québec, Canada
| | - Ondrej Seda
- Montreal Diabetes Research Center, University of Montréal, Montréal, Québec, Canada
- University of Montréal Hospital Research Centre, Montréal, Québec, Canada
| | - Marc Prentki
- Montreal Diabetes Research Center, University of Montréal, Montréal, Québec, Canada
- University of Montréal Hospital Research Centre, Montréal, Québec, Canada
- Department of Biochemistry, University of Montréal, Montréal, Québec, Canada
- Department of Nutrition, University of Montréal, Montréal, Québec, Canada
| | - Vincent Poitout
- Montreal Diabetes Research Center, University of Montréal, Montréal, Québec, Canada
- University of Montréal Hospital Research Centre, Montréal, Québec, Canada
- Department of Medicine, University of Montréal, Montréal, Québec, Canada
- Department of Biochemistry, University of Montréal, Montréal, Québec, Canada
- Department of Nutrition, University of Montréal, Montréal, Québec, Canada
- Corresponding author: Vincent Poitout,
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11
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Kilic G, Alvarez-Mercado AI, Zarrouki B, Opland D, Liew CW, Alonso LC, Myers MG, Jonas JC, Poitout V, Kulkarni RN, Mauvais-Jarvis F. The islet estrogen receptor-α is induced by hyperglycemia and protects against oxidative stress-induced insulin-deficient diabetes. PLoS One 2014; 9:e87941. [PMID: 24498408 PMCID: PMC3912162 DOI: 10.1371/journal.pone.0087941] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2013] [Accepted: 01/01/2014] [Indexed: 12/11/2022] Open
Abstract
The female steroid, 17β-estradiol (E2), is important for pancreatic β-cell function and acts via at least three estrogen receptors (ER), ERα, ERβ, and the G-protein coupled ER (GPER). Using a pancreas-specific ERα knockout mouse generated using the Cre-lox-P system and a Pdx1-Cre transgenic line (PERαKO−/−), we previously reported that islet ERα suppresses islet glucolipotoxicity and prevents β-cell dysfunction induced by high fat feeding. We also showed that E2 acts via ERα to prevent β-cell apoptosis in vivo. However, the contribution of the islet ERα to β-cell survival in vivo, without the contribution of ERα in other tissues is still unclear. Using the PERαKO−/− mouse, we show that ERα mRNA expression is only decreased by 20% in the arcuate nucleus of the hypothalamus, without a parallel decrease in the VMH, making it a reliable model of pancreas-specific ERα elimination. Following exposure to alloxan-induced oxidative stress in vivo, female and male PERαKO−/− mice exhibited a predisposition to β-cell destruction and insulin deficient diabetes. In male PERαKO−/− mice, exposure to E2 partially prevented alloxan-induced β-cell destruction and diabetes. ERα mRNA expression was induced by hyperglycemia in vivo in islets from young mice as well as in cultured rat islets. The induction of ERα mRNA by hyperglycemia was retained in insulin receptor-deficient β-cells, demonstrating independence from direct insulin regulation. These findings suggest that induction of ERα expression acts to naturally protect β-cells against oxidative injury.
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Affiliation(s)
- Gamze Kilic
- Department of Medicine, Division of Endocrinology, Metabolism and Molecular Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
| | - Ana I. Alvarez-Mercado
- Department of Medicine, Division of Endocrinology and Metabolism, Tulane University Health Sciences Center, School of Medicine, New Orleans, LA, United States of America
| | - Bader Zarrouki
- Montreal Diabetes Research Center, CRCHUM and Department of Medicine, University of Montréal, Montréal, QC, Canada
| | - Darren Opland
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Chong Wee Liew
- Section of Islet Cell Biology and Regenerative Medicine, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Laura C. Alonso
- Department of Medicine, Division of Diabetes, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Martin G. Myers
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Jean-Christophe Jonas
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Clinical and Experimental Research, Catholic University of Louvain, Brussels, Belgium
| | - Vincent Poitout
- Montreal Diabetes Research Center, CRCHUM and Department of Medicine, University of Montréal, Montréal, QC, Canada
| | - Rohit N. Kulkarni
- Section of Islet Cell Biology and Regenerative Medicine, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Franck Mauvais-Jarvis
- Department of Medicine, Division of Endocrinology, Metabolism and Molecular Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
- Department of Medicine, Division of Endocrinology and Metabolism, Tulane University Health Sciences Center, School of Medicine, New Orleans, LA, United States of America
- * E-mail:
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12
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Semache M, Ghislain J, Zarrouki B, Tremblay C, Poitout V. Pancreatic and duodenal homeobox-1 nuclear localization is regulated by glucose in dispersed rat islets but not in insulin-secreting cell lines. Islets 2014; 6:e982376. [PMID: 25437380 PMCID: PMC4588559 DOI: 10.4161/19382014.2014.982376] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The transcription factor Pancreatic and Duodenal Homeobox-1 (PDX-1) plays a major role in the development and function of pancreatic β-cells and its mutation results in diabetes. In adult β-cells, glucose stimulates transcription of the insulin gene in part by regulating PDX-1 expression, stability and activity. Glucose is also thought to modulate PDX-1 nuclear translocation but in vitro studies examining nucleo-cytoplasmic shuttling of endogenous or ectopically expressed PDX-1 in insulin-secreting cell lines have led to conflicting results. Here we show that endogenous PDX-1 undergoes translocation from the cytoplasm to the nucleus in response to glucose in dispersed rat islets but not in insulin-secreting MIN6, HIT-T15, or INS832/13 cells. Interestingly, however, we found that a PDX-1-GFP fusion protein can shuttle from the cytoplasm to the nucleus in response to glucose stimulation in HIT-T15 cells. Our results suggest that the regulation of endogenous PDX-1 sub-cellular localization by glucose is observed in primary islets and that care should be taken when interpreting data from insulin-secreting cell lines.
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Key Words
- ANOVA, analysis of variance
- BSA, bovine serum albumin
- DAPI, 4′, 6-diamidino-2-phenylindole
- DMEM, dulbecco's modified eagle medium
- EDTA, ethylenediaminetetraacetic acid
- GFP, green fluorescent protein
- HDAC, histone deacetylase
- HIT-T15
- INS832/13
- KRBH, krebs ringer bicarbonate hepes
- MIN6
- MODY, maturity-onset diabetes of the young
- PDX-1
- PDX-1, pancreatic and duodenal homeobox-1
- SEM, standard error of the mean
- SUMO, small ubiquitin-like modifier
- T2D, type 2 diabetes
- ZDF, zucker diabetic fatty
- glucose
- glucose-stimulated insulin secretion
- nucleo-cytoplasmic shuttling
- pancreatic β cells
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Affiliation(s)
- Meriem Semache
- Montreal Diabetes Research Center; CRCHUM; Montreal, QC, Canada
- Department of Biochemistry; University of Montreal; QC, Canada
| | - Julien Ghislain
- Montreal Diabetes Research Center; CRCHUM; Montreal, QC, Canada
| | - Bader Zarrouki
- Montreal Diabetes Research Center; CRCHUM; Montreal, QC, Canada
- Department of Medicine; University of Montreal; QC, Canada
| | | | - Vincent Poitout
- Montreal Diabetes Research Center; CRCHUM; Montreal, QC, Canada
- Department of Biochemistry; University of Montreal; QC, Canada
- Department of Medicine; University of Montreal; QC, Canada
- Correspondence to: Vincent Poitout;
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13
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Zarrouki B, Benterki I, Fontés G, Peyot ML, Seda O, Prentki M, Poitout V. Epidermal Growth Factor Signalling Promotes Pancreatic Beta-Cell Proliferation in Response to Nutrient Excess in Rats Through MTOR And FOXM1. Can J Diabetes 2013. [DOI: 10.1016/j.jcjd.2013.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Zarrouki B, Benterki I, Fontés G, Peyot ML, Seda O, Prentki M, Poitout V. Epidermal Growth Factor Signalling Promotes Pancreatic Beta-Cell Proliferation In Response to Nutrient Excess tn Rats Through MTOR And FOXM1. Can J Diabetes 2013. [DOI: 10.1016/j.jcjd.2013.08.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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15
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Abstract
Chronic exposure to excessive levels of nutrients is postulated to affect the function of several organs and tissues and to contribute to the development of the many complications associated with obesity and the metabolic syndrome, including type 2 diabetes. To study the mechanisms by which excessive levels of glucose and fatty acids affect the pancreatic beta-cell and the secretion of insulin, we have established a chronic nutrient infusion model in the rat. The procedure consists of catheterizing the right jugular vein and left carotid artery under general anesthesia; allowing a 7-day recuperation period; connecting the catheters to the pumps using a swivel and counterweight system that enables the animal to move freely in the cage; and infusing glucose and/or Intralipid (a soybean oil emulsion which generates a mixture of approximately 80% unsaturated/20% saturated fatty acids when infused with heparin) for 72 hr. This model offers several advantages, including the possibility to finely modulate the target levels of circulating glucose and fatty acids; the option to co-infuse pharmacological compounds; and the relatively short time frame as opposed to dietary models. It can be used to examine the mechanisms of nutrient-induced dysfunction in a variety of organs and to test the effectiveness of drugs in this context.
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16
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Sabatini PV, Krentz NA, Zarrouki B, Westwell-Roper CY, Nian C, Uy RA, Shapiro AJ, Poitout V, Lynn FC. Npas4 is a novel activity-regulated cytoprotective factor in pancreatic β-cells. Diabetes 2013; 62:2808-20. [PMID: 23656887 PMCID: PMC3717850 DOI: 10.2337/db12-1527] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Cellular homeostasis requires intrinsic sensing mechanisms to temper function in the face of prolonged activity. In the pancreatic β-cell, glucose is likely a physiological trigger that activates an adaptive response to stimulation, thereby maintaining cellular homeostasis. Immediate early genes (IEGs) are activated as a first line of defense in cellular homeostasis and are largely responsible for transmitting an environmental cue to a cellular response. Here we examine the regulation and function of the novel β-cell IEG, neuronal PAS domain protein 4 (Npas4). Using MIN6 cells, mouse and human islets, as well as in vivo infusions, we demonstrate that Npas4 is expressed within pancreatic islets and is upregulated by β-cell depolarizing agents. Npas4 tempers β-cell function through a direct inhibitory interaction with the insulin promoter and by blocking the potentiating effects of GLP-1 without significantly reducing glucose-stimulated secretion. Finally, Npas4 expression is induced by classical endoplasmic reticulum (ER) stressors and can prevent thapsigargin- and palmitate-induced dysfunction and cell death. These results suggest that Npas4 is a key activity-dependent regulator that improves β-cell efficiency in the face of stress. We posit that Npas4 could be a novel therapeutic target in type 2 diabetes that could both reduce ER stress and cell death and maintain basal cell function.
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Affiliation(s)
- Paul V. Sabatini
- Diabetes Research Group, Child and Family Research Institute, Vancouver, British Columbia, Canada
- Department of Surgery and Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Nicole A.J. Krentz
- Diabetes Research Group, Child and Family Research Institute, Vancouver, British Columbia, Canada
- Department of Surgery and Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Bader Zarrouki
- Montreal Diabetes Research Center, CRCHUM, and Department of Medicine, Université de Montréal, Montréal, Quebec, Canada
| | - Clara Y. Westwell-Roper
- Diabetes Research Group, Child and Family Research Institute, Vancouver, British Columbia, Canada
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Cuilan Nian
- Diabetes Research Group, Child and Family Research Institute, Vancouver, British Columbia, Canada
- Department of Surgery and Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Ryan A. Uy
- Diabetes Research Group, Child and Family Research Institute, Vancouver, British Columbia, Canada
| | | | - Vincent Poitout
- Montreal Diabetes Research Center, CRCHUM, and Department of Medicine, Université de Montréal, Montréal, Quebec, Canada
| | - Francis C. Lynn
- Diabetes Research Group, Child and Family Research Institute, Vancouver, British Columbia, Canada
- Department of Surgery and Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia, Canada
- Corresponding author: Francis C. Lynn,
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17
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Semache M, Zarrouki B, Fontés G, Fogarty S, Kikani C, Chawki MB, Rutter J, Poitout V. Per-Arnt-Sim kinase regulates pancreatic duodenal homeobox-1 protein stability via phosphorylation of glycogen synthase kinase 3β in pancreatic β-cells. J Biol Chem 2013; 288:24825-33. [PMID: 23853095 DOI: 10.1074/jbc.m113.495945] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
In pancreatic β-cells, glucose induces the binding of the transcription factor pancreatic duodenal homeobox-1 (PDX-1) to the insulin gene promoter to activate insulin gene transcription. At low glucose levels, glycogen synthase kinase 3β (GSK3β) is known to phosphorylate PDX-1 on C-terminal serine residues, which triggers PDX-1 proteasomal degradation. We previously showed that the serine/threonine Per-Arnt-Sim domain-containing kinase (PASK) regulates insulin gene transcription via PDX-1. However, the mechanisms underlying this regulation are unknown. In this study, we aimed to identify the role of PASK in the regulation of PDX-1 phosphorylation, protein expression, and stability in insulin-secreting cells and isolated rodent islets of Langerhans. We observed that glucose induces a decrease in overall PDX-1 serine phosphorylation and that overexpression of WT PASK mimics this effect. In vitro, PASK directly phosphorylates GSK3β on its inactivating phosphorylation site Ser(9). Overexpression of a kinase-dead (KD), dominant negative version of PASK blocks glucose-induced Ser(9) phosphorylation of GSK3β. Accordingly, GSK3β Ser(9) phosphorylation is reduced in islets from pask-null mice. Overexpression of WT PASK or KD GSK3β protects PDX-1 from degradation and results in increased PDX-1 protein abundance. Conversely, overexpression of KD PASK blocks glucose-induction of PDX-1 protein. We conclude that PASK phosphorylates and inactivates GSK3β, thereby preventing PDX-1 serine phosphorylation and alleviating GSK3β-mediated PDX-1 protein degradation in pancreatic β-cells.
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Affiliation(s)
- Meriem Semache
- Montreal Diabetes Research Center, CRCHUM, Quebec City H1W4A4, Canada
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18
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Ferdaoussi M, Bergeron V, Zarrouki B, Kolic J, Cantley J, Fielitz J, Olson EN, Prentki M, Biden T, MacDonald PE, Poitout V. G protein-coupled receptor (GPR)40-dependent potentiation of insulin secretion in mouse islets is mediated by protein kinase D1. Diabetologia 2012; 55:2682-2692. [PMID: 22820510 PMCID: PMC3543464 DOI: 10.1007/s00125-012-2650-x] [Citation(s) in RCA: 127] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Accepted: 06/18/2012] [Indexed: 10/28/2022]
Abstract
AIMS/HYPOTHESIS Activation of the G protein-coupled receptor (GPR)40 by long-chain fatty acids potentiates glucose-stimulated insulin secretion (GSIS) from pancreatic beta cells, and GPR40 agonists are in clinical development for type 2 diabetes therapy. GPR40 couples to the G protein subunit Gα(q/11) but the signalling cascade activated downstream is unknown. This study aimed to determine the mechanisms of GPR40-dependent potentiation of GSIS by fatty acids. METHODS Insulin secretion in response to glucose, oleate or diacylglycerol (DAG) was assessed in dynamic perifusions and static incubations in islets from wild-type (WT) and Gpr40 (-/-) mice. Depolymerisation of filamentous actin (F-actin) was visualised by phalloidin staining and epifluorescence. Pharmacological and molecular approaches were used to ascertain the roles of protein kinase D (PKD) and protein kinase C delta in GPR40-mediated potentiation of GSIS. RESULTS Oleate potentiates the second phase of GSIS, and this effect is largely dependent upon GPR40. Accordingly, oleate induces rapid F-actin remodelling in WT but not in Gpr40 (-/-) islets. Exogenous DAG potentiates GSIS in both WT and Gpr40 (-/-) islets. Oleate induces PKD phosphorylation at residues Ser-744/748 and Ser-916 in WT but not Gpr40 (-/-) islets. Importantly, oleate-induced F-actin depolymerisation and potentiation of GSIS are lost upon pharmacological inhibition of PKD1 or deletion of Prkd1. CONCLUSIONS/INTERPRETATION We conclude that the signalling cascade downstream of GPR40 activation by fatty acids involves activation of PKD1, F-actin depolymerisation and potentiation of second-phase insulin secretion. These results provide important information on the mechanisms of action of GPR40, a novel drug target for type 2 diabetes.
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Affiliation(s)
- M Ferdaoussi
- Montreal Diabetes Research Center, CRCHUM, Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada, H1W 4A4
- Department of Medicine, University of Montreal, Montreal, QC, Canada
| | - V Bergeron
- Montreal Diabetes Research Center, CRCHUM, Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada, H1W 4A4
- Department of Medicine, University of Montreal, Montreal, QC, Canada
| | - B Zarrouki
- Montreal Diabetes Research Center, CRCHUM, Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada, H1W 4A4
- Department of Medicine, University of Montreal, Montreal, QC, Canada
| | - J Kolic
- Department of Pharmacology and the Alberta Diabetes Institute, University of Alberta, Edmonton, AB, Canada
| | - J Cantley
- Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, Sydney, NSW, Australia
| | - J Fielitz
- Experimental and Clinical Research Center, a joint cooperation between the Charité Medical Faculty and the Max-Delbrück Center for Molecular Medicine, Berlin, Germany
- Medical Department, Division of Cardiology, Charité University, Campus Virchow-Klinikum, Berlin, Germany
| | - E N Olson
- Departments of Molecular Biology, Internal Medicine, and Pathology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - M Prentki
- Montreal Diabetes Research Center, CRCHUM, Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada, H1W 4A4
- Departments of Nutrition and Biochemistry, University of Montreal, Montreal, QC, Canada
| | - T Biden
- Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, Sydney, NSW, Australia
| | - P E MacDonald
- Department of Pharmacology and the Alberta Diabetes Institute, University of Alberta, Edmonton, AB, Canada
| | - V Poitout
- Montreal Diabetes Research Center, CRCHUM, Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada, H1W 4A4.
- Department of Medicine, University of Montreal, Montreal, QC, Canada.
- Departments of Nutrition and Biochemistry, University of Montreal, Montreal, QC, Canada.
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Kalbacher E, Koppe L, Zarrouki B, Pillon NJ, Fouque D, Soulage CO. Human uremic plasma and not urea induces exuberant secretion of leptin in 3T3-L1 adipocytes. J Ren Nutr 2011; 21:72-5. [PMID: 21195924 DOI: 10.1053/j.jrn.2010.11.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Chronic kidney disease (CKD) is frequently associated with malnutrition, anorexia, and hyperleptinemia. This study was designed to test the hypothesis that a component of the uremic milieu may trigger leptin release by adipocytes. To this end, mouse 3T3-L1 adipocytes were incubated for 16 hours in culture medium containing urea (80 mM) or plasma from either healthy volunteers or patients with CKD (20%, v/v). Uremic plasma and not urea induced a large release of leptin (+557%, P < .01). These results suggest that the hyperleptinemia reported in patients with CKD, could be, at least in part, because of an overproduction of leptin by the adipose tissue.
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Fontés G, Zarrouki B, Hagman DK, Latour MG, Semache M, Roskens V, Moore PC, Prentki M, Rhodes CJ, Jetton TL, Poitout V. Glucolipotoxicity age-dependently impairs beta cell function in rats despite a marked increase in beta cell mass. Diabetologia 2010; 53:2369-79. [PMID: 20628728 PMCID: PMC2947580 DOI: 10.1007/s00125-010-1850-5] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2010] [Accepted: 06/18/2010] [Indexed: 01/25/2023]
Abstract
AIMS/HYPOTHESIS Prolonged exposure of pancreatic beta cells to excessive levels of glucose and fatty acids, referred to as glucolipotoxicity, is postulated to contribute to impaired glucose homeostasis in patients with type 2 diabetes. However, the relative contribution of defective beta cell function vs diminished beta cell mass under glucolipotoxic conditions in vivo remains a subject of debate. We therefore sought to determine whether glucolipotoxicity in rats is due to impaired beta cell function and/or reduced beta cell mass, and whether older animals are more susceptible to glucolipotoxic condition. METHODS Wistar rats (2 and 6 months old) received a 72 h infusion of glucose + intravenous fat emulsion or saline control. In vivo insulin secretion and sensitivity were assessed by hyperglycaemic clamps. Ex vivo insulin secretion, insulin biosynthesis and gene expression were measured in isolated islets. Beta cell mass and proliferation were examined by immunohistochemistry. RESULTS A 72 h infusion of glucose + intravenous fat emulsion in 2-month-old Wistar rats did not affect insulin sensitivity, insulin secretion or beta cell mass. In 6-month-old rats by contrast it led to insulin resistance and reduced insulin secretion in vivo, despite an increase in beta cell mass and proliferation. This was associated with: (1) diminished glucose-stimulated second-phase insulin secretion and proinsulin biosynthesis; (2) lower insulin content; and (3) reduced expression of beta cell genes in isolated islets. CONCLUSIONS/INTERPRETATION In this in vivo model, glucolipotoxicity is characterised by an age-dependent impairment of glucose-regulated beta cell function despite a marked increase in beta cell mass.
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Affiliation(s)
- G. Fontés
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- CRCHUM–Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada H1W 4A4
- Department of Medicine, University of Montreal, Montreal, QC, Canada
| | - B. Zarrouki
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- CRCHUM–Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada H1W 4A4
- Department of Medicine, University of Montreal, Montreal, QC, Canada
| | - D. K. Hagman
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- CRCHUM–Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada H1W 4A4
- Department of Medicine, University of Montreal, Montreal, QC, Canada
| | - M. G. Latour
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- CRCHUM–Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada H1W 4A4
| | - M. Semache
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- CRCHUM–Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada H1W 4A4
- Department of Biochemistry, University of Montreal, Montreal, QC, Canada
| | - V. Roskens
- Division of Endocrinology, Diabetes and Metabolism, University of Vermont College of Medicine, Burlington, VT, USA
| | - P. C. Moore
- Kovler Diabetes Center, University of Chicago, Chicago, IL, USA
| | - M. Prentki
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- CRCHUM–Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada H1W 4A4
- Department of Nutrition, University of Montreal, Montreal, QC, Canada
- Department of Biochemistry, University of Montreal, Montreal, QC, Canada
| | - C. J. Rhodes
- Kovler Diabetes Center, University of Chicago, Chicago, IL, USA
| | - T. L. Jetton
- Division of Endocrinology, Diabetes and Metabolism, University of Vermont College of Medicine, Burlington, VT, USA
| | - V. Poitout
- Montreal Diabetes Research Center, University of Montreal, Montreal, QC, Canada
- CRCHUM–Technopole Angus, 2901 Rachel Est, Montréal, QC, Canada H1W 4A4,
- Department of Medicine, University of Montreal, Montreal, QC, Canada
- Department of Nutrition, University of Montreal, Montreal, QC, Canada
- Department of Biochemistry, University of Montreal, Montreal, QC, Canada
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Peyot ML, Pepin E, Lamontagne J, Latour MG, Zarrouki B, Lussier R, Pineda M, Jetton TL, Madiraju SRM, Joly E, Prentki M. Beta-cell failure in diet-induced obese mice stratified according to body weight gain: secretory dysfunction and altered islet lipid metabolism without steatosis or reduced beta-cell mass. Diabetes 2010; 59:2178-87. [PMID: 20547980 PMCID: PMC2927940 DOI: 10.2337/db09-1452] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE C57Bl/6 mice develop obesity and mild hyperglycemia when fed a high-fat diet (HFD). Although diet-induced obesity (DIO) is a widely studied model of type 2 diabetes, little is known about beta-cell failure in these mice. RESEARCH DESIGN AND METHODS DIO mice were separated in two groups according to body weight gain: low- and high-HFD responders (LDR and HDR). We examined whether mild hyperglycemia in HDR mice is due to reduced beta-cell mass or function and studied islet metabolism and signaling. RESULTS HDR mice were more obese, hyperinsulinemic, insulin resistant, and hyperglycemic and showed a more altered plasma lipid profile than LDR. LDR mice largely compensated insulin resistance, whereas HDR showed perturbed glucose homeostasis. Neither LDR nor HDR mice showed reduced beta-cell mass, altered islet glucose metabolism, and triglyceride deposition. Insulin secretion in response to glucose, KCl, and arginine was impaired in LDR and almost abolished in HDR islets. Palmitate partially restored glucose- and KCl-stimulated secretion. The glucose-induced rise in ATP was reduced in both DIO groups, and the glucose-induced rise in Ca(2+) was reduced in HDR islets relatively to LDR. Glucose-stimulated lipolysis was decreased in LDR and HDR islets, whereas fat oxidation was increased in HDR islets only. Fatty acid esterification processes were markedly diminished, and free cholesterol accumulated in HDR islets. CONCLUSIONS beta-Cell failure in HDR mice is not due to reduced beta-cell mass and glucose metabolism or steatosis but to a secretory dysfunction that is possibly due to altered ATP/Ca(2+) and lipid signaling, as well as free cholesterol deposition.
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Affiliation(s)
- Marie-Line Peyot
- Montreal Diabetes Research Center and CRCHUM, Montreal, QC, Canada.
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Poitout V, Amyot J, Semache M, Zarrouki B, Hagman D, Fontés G. Glucolipotoxicity of the pancreatic beta cell. Biochim Biophys Acta Mol Cell Biol Lipids 2009; 1801:289-98. [PMID: 19715772 DOI: 10.1016/j.bbalip.2009.08.006] [Citation(s) in RCA: 264] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2009] [Revised: 08/13/2009] [Accepted: 08/13/2009] [Indexed: 02/07/2023]
Abstract
The concept of glucolipotoxicity refers to the combined, deleterious effects of elevated glucose and fatty acid levels on pancreatic beta-cell function and survival. Significant progress has been made in recent years towards a better understanding of the cellular and molecular basis of glucolipotoxicity in the beta cell. The permissive effect of elevated glucose on the detrimental actions of fatty acids stems from the influence of glucose on intracellular fatty acid metabolism, promoting the synthesis of cellular lipids. The combination of excessive levels of fatty acids and glucose therefore leads to decreased insulin secretion, impaired insulin gene expression, and beta-cell death by apoptosis, all of which probably have distinct underlying mechanisms. Recent studies from our laboratory have identified several pathways implicated in fatty acid inhibition of insulin gene expression, including the extracellular-regulated kinase (ERK1/2) pathway, the metabolic sensor Per-Arnt-Sim kinase (PASK), and the ATF6 branch of the unfolded protein response. We have also confirmed in vivo in rats that the decrease in insulin gene expression is an early defect which precedes any detectable abnormality in insulin secretion. While the role of glucolipotoxicity in humans is still debated, the inhibitory effects of chronically elevated fatty acid levels has been clearly demonstrated in several studies, at least in individuals genetically predisposed to developing type 2 diabetes. It is therefore likely that glucolipotoxicity contributes to beta-cell failure in type 2 diabetes as well as to the decline in beta-cell function observed after the onset of the disease.
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Affiliation(s)
- Vincent Poitout
- Montreal Diabetes Research Center, CRCHUM, Department of Medicine, University of Montreal, Montreal, QC, Canada.
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Pillon N, Zarrouki B, Lagarde M, Soulage C. P79 Altération des voies intracellulaires de signalisation de l’insuline dans les cellules adipeuses et musculaires par les produits de peroxydation lipidiques 4-hydroxy-2-nonenal (4-HNE) et 4-hydroxy-hexenal (4-HHE). Diabetes & Metabolism 2009. [DOI: 10.1016/s1262-3636(09)71877-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Soulage C, Zarrouki B, Soares AF, Lagarde M, Geloen A. Lou/C obesity-resistant rat exhibits hyperactivity, hypermetabolism, alterations in white adipose tissue cellularity, and lipid tissue profiles. Endocrinology 2008; 149:615-25. [PMID: 18006635 DOI: 10.1210/en.2007-0317] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Lou/C obesity-resistant rat constitutes an original model to understand the phenomena of overweight and obesity. The aim of the present study was to identify metabolic causes for the outstanding leanness of Lou/C rat. To this end, the metabolic profiles (food intake, energy expenditure, and physical activity) and the cellular characteristics of white adipose tissue (lipogenesis, lipolysis, cellularity, and lipid composition) in 30-wk-old Lou/C rats were compared with age-matched Wistar rats. Lou/C rats exhibited a lower body weight (-45%), reduced adiposity (-80%), increased locomotor activity (+95%), and higher energy expenditure (+11%) than Wistar rats. Epididymal adipose tissue of Lou/C rat was twice lower than that of Wistar rat due to both a reduction in both adipocyte size (-25%) and number (three times). Basal lipolysis and sensitivity to noradrenaline were similar; however, the responsiveness to noradrenaline was lower in adipocytes from Lou/C compared with that from Wistar rats. Lipidomic analysis of plasma, adipose tissue, and liver revealed profound differences in lipid composition between the two strains. Of note, the desaturation indexes (ratio C16:1/C16:0 and C18:1/C18:0) were lower in Lou/C, indicating a blunted activity of delta-9-desaturase such as stearoyl-coenzyme A-desaturase-1. Increased physical activity, increased energy expenditure, and white adipose tissue cellularity are in good agreement with previous observations suggesting that a higher sympathetic tone in Lou/C could contribute to its lifelong leanness.
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Zarrouki B, Soares AF, Guichardant M, Lagarde M, Géloën A. The lipid peroxidation end-product 4-HNE induces COX-2 expression through p38MAPK activation in 3T3-L1 adipose cell. FEBS Lett 2007; 581:2394-400. [PMID: 17481611 DOI: 10.1016/j.febslet.2007.04.048] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2007] [Accepted: 04/19/2007] [Indexed: 01/01/2023]
Abstract
Oxidative stress and low grade chronic inflammation are increased in accumulating fat. Our objective was to test whether 4-hydroxynonenal (4-HNE), an end-product of lipid peroxidation, affects cyclooxygenases in 3T3-L1 adipose cells. 4-HNE increased COX-2 mRNA and protein expression and p38MAP-kinase phosphorylation in a dose-dependent manner. Pretreatment of 3T3-L1 cells by a selective inhibitor of p38MAPK (PD 169316) abolished 4-HNE and glucose oxidase induced COX-2 expression. Our results show that oxidative stress induces COX-2 expression through the production of 4-HNE which activates p38MAPKinase, suggesting that 4-HNE links oxidative stress and chronic inflammation through the activation of cyclooxygenase.
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