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Grieve LM, Rani A, ZeRuth GT. Downregulation of Glis3 in INS1 cells exposed to chronically elevated glucose contributes to glucotoxicity-associated β cell dysfunction. Islets 2024; 16:2344622. [PMID: 38652652 DOI: 10.1080/19382014.2024.2344622] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 04/15/2024] [Indexed: 04/25/2024] Open
Abstract
Chronically elevated levels of glucose are deleterious to pancreatic β cells and contribute to β cell dysfunction, which is characterized by decreased insulin production and a loss of β cell identity. The Krüppel-like transcription factor, Glis3 has previously been shown to positively regulate insulin transcription and mutations within the Glis3 locus have been associated with the development of several pathologies including type 2 diabetes mellitus. In this report, we show that Glis3 is significantly downregulated at the transcriptional level in INS1 832/13 cells within hours of being subjected to high glucose concentrations and that diminished expression of Glis3 is at least partly attributable to increased oxidative stress. CRISPR/Cas9-mediated knockdown of Glis3 indicated that the transcription factor was required to maintain normal levels of both insulin and MafA expression and reduced Glis3 expression was concomitant with an upregulation of β cell disallowed genes. We provide evidence that Glis3 acts similarly to a pioneer factor at the insulin promoter where it permissively remodels the chromatin to allow access to a transcriptional regulatory complex including Pdx1 and MafA. Finally, evidence is presented that Glis3 can positively regulate MafA transcription through its pancreas-specific promoter and that MafA reciprocally regulates Glis3 expression. Collectively, these results suggest that decreased Glis3 expression in β cells exposed to chronic hyperglycemia may contribute significantly to reduced insulin transcription and a loss of β cell identity.
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Affiliation(s)
- LilyAnne M Grieve
- Department of Biological Sciences, Murray State University, Murray, KY, USA
| | - Abhya Rani
- Department of Biological Sciences, Murray State University, Murray, KY, USA
| | - Gary T ZeRuth
- Department of Biological Sciences, Murray State University, Murray, KY, USA
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2
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Yamagata K, Tsuyama T, Sato Y. Roles of β-Cell Hypoxia in the Progression of Type 2 Diabetes. Int J Mol Sci 2024; 25:4186. [PMID: 38673770 PMCID: PMC11050445 DOI: 10.3390/ijms25084186] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2024] [Revised: 04/05/2024] [Accepted: 04/08/2024] [Indexed: 04/28/2024] Open
Abstract
Type 2 diabetes is a chronic disease marked by hyperglycemia; impaired insulin secretion by pancreatic β-cells is a hallmark of this disease. Recent studies have shown that hypoxia occurs in the β-cells of patients with type 2 diabetes and hypoxia, in turn, contributes to the insulin secretion defect and β-cell loss through various mechanisms, including the activation of hypoxia-inducible factors, induction of transcriptional repressors, and activation of AMP-activated protein kinase. This review focuses on advances in our understanding of the contribution of β-cell hypoxia to the development of β-cell dysfunction in type 2 diabetes. A better understanding of β-cell hypoxia might be useful in the development of new strategies for treating type 2 diabetes.
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Affiliation(s)
- Kazuya Yamagata
- Department of Medical Biochemistry, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan;
- Center for Metabolic Regulation of Healthy Aging (CMHA), Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan;
| | - Tomonori Tsuyama
- Center for Metabolic Regulation of Healthy Aging (CMHA), Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan;
| | - Yoshifumi Sato
- Department of Medical Biochemistry, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan;
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3
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Chen X, Zhou Q, Chen H, Bai J, An R, Zhang K, Zhang X, An H, Zhang J, Wang Y, Li M. Glutathione Induces Keap1 S-Glutathionylation and Mitigates Oscillating Glucose-Induced β-Cell Dysfunction by Activating Nrf2. Antioxidants (Basel) 2024; 13:400. [PMID: 38671848 PMCID: PMC11047546 DOI: 10.3390/antiox13040400] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 03/20/2024] [Accepted: 03/25/2024] [Indexed: 04/28/2024] Open
Abstract
Glutathione (GSH), a robust endogenous antioxidant, actively participates in the modulation of the redox status of cysteine residues in proteins. Previous studies have indicated that GSH can prevent β-cell failure and prediabetes caused by chronic oscillating glucose (OsG) administration. However, the precise mechanism underlying the protective effect is not well understood. Our current research reveals that GSH is capable of reversing the reduction in Nrf2 levels, as well as downstream genes Grx1 and HO-1, in the islet β-cells of rats induced by chronic OsG. In vitro experiments have further demonstrated that GSH can prevent β-cell dedifferentiation, apoptosis, and impaired insulin secretion caused by OsG. Additionally, GSH facilitates the translocation of Nrf2 into the nucleus, resulting in an upregulation of Nrf2-targeted genes such as GCLC, Grx1, HO-1, and NQO1. Notably, when the Nrf2 inhibitor ML385 is employed, the effects of GSH on OsG-treated β-cells are abrogated. Moreover, GSH enhances the S-glutathionylation of Keap1 at Cys273 and Cys288, but not Cys151, in OsG-treated β-cells, leading to the dissociation of Nrf2 from Keap1 and facilitating Nrf2 nuclear translocation. In conclusion, the protective role of GSH against OsG-induced β-cell failure can be partially attributed to its capacity to enhance Keap1 S-glutathionylation, thereby activating the Nrf2 signaling pathway. These findings provide novel insights into the prevention and treatment of β-cell failure in the context of prediabetes/diabetes, highlighting the potential of GSH.
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Affiliation(s)
- Xiufang Chen
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (Q.Z.); (H.C.); (J.B.); (R.A.); (K.Z.)
| | - Qian Zhou
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (Q.Z.); (H.C.); (J.B.); (R.A.); (K.Z.)
| | - Huamin Chen
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (Q.Z.); (H.C.); (J.B.); (R.A.); (K.Z.)
| | - Juan Bai
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (Q.Z.); (H.C.); (J.B.); (R.A.); (K.Z.)
| | - Ruike An
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (Q.Z.); (H.C.); (J.B.); (R.A.); (K.Z.)
| | - Keyi Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (Q.Z.); (H.C.); (J.B.); (R.A.); (K.Z.)
| | - Xinyue Zhang
- Cardiac Regeneration Research Institute, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (X.Z.); (H.A.); (J.Z.)
| | - Hui An
- Cardiac Regeneration Research Institute, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (X.Z.); (H.A.); (J.Z.)
| | - Jitai Zhang
- Cardiac Regeneration Research Institute, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (X.Z.); (H.A.); (J.Z.)
| | - Yongyu Wang
- Institute of Hypoxia Medicine, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China;
| | - Ming Li
- Cardiac Regeneration Research Institute, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China; (X.Z.); (H.A.); (J.Z.)
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Zeng Y, Li Y, Jiang W, Hou N. Molecular mechanisms of metabolic dysregulation in diabetic cardiomyopathy. Front Cardiovasc Med 2024; 11:1375400. [PMID: 38596692 PMCID: PMC11003275 DOI: 10.3389/fcvm.2024.1375400] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Accepted: 03/08/2024] [Indexed: 04/11/2024] Open
Abstract
Diabetic cardiomyopathy (DCM), one of the most serious complications of diabetes mellitus, has become recognized as a cardiometabolic disease. In normoxic conditions, the majority of the ATP production (>95%) required for heart beating comes from mitochondrial oxidative phosphorylation of fatty acids (FAs) and glucose, with the remaining portion coming from a variety of sources, including fructose, lactate, ketone bodies (KB) and branched chain amino acids (BCAA). Increased FA intake and decreased utilization of glucose and lactic acid were observed in the diabetic hearts of animal models and diabetic patients. Moreover, the polyol pathway is activated, and fructose metabolism is enhanced. The use of ketones as energy sources in human diabetic hearts also increases significantly. Furthermore, elevated BCAA levels and impaired BCAA metabolism were observed in the hearts of diabetic mice and patients. The shift in energy substrate preference in diabetic hearts results in increased oxygen consumption and impaired oxidative phosphorylation, leading to diabetic cardiomyopathy. However, the precise mechanisms by which impaired myocardial metabolic alterations result in diabetes mellitus cardiac disease are not fully understood. Therefore, this review focuses on the molecular mechanisms involved in alterations of myocardial energy metabolism. It not only adds more molecular targets for the diagnosis and treatment, but also provides an experimental foundation for screening novel therapeutic agents for diabetic cardiomyopathy.
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Affiliation(s)
- Yue Zeng
- Key Laboratory of Molecular Target & Clinical Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
- Department of Pharmacy, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan, China
| | - Yilang Li
- Key Laboratory of Molecular Target & Clinical Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
- Department of Pharmacy, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan, China
| | - Wenyue Jiang
- Department of Pharmacy, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan, China
| | - Ning Hou
- Key Laboratory of Molecular Target & Clinical Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
- Department of Pharmacy, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan, China
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Rak MB, Gilor C, Niessen SJM, Furrow E. Spontaneous remission and relapse of diabetes mellitus in a male dog. J Vet Intern Med 2024; 38:1152-1156. [PMID: 38240130 PMCID: PMC10937483 DOI: 10.1111/jvim.16991] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 12/21/2023] [Indexed: 02/18/2024] Open
Abstract
An 8-year-old male neutered Miniature Schnauzer was diagnosed with diabetes mellitus based on fasting hyperglycemia and glucosuria after a 2-week history of polydipsia and periuria, in line with the Agreeing Language in Veterinary Endocrinology consensus definition. Treatment of insulin and dietary management was initiated. The insulin dose was gradually reduced and eventually discontinued over the next year based on spot blood glucose concentrations that revealed euglycemia or hypoglycemia. After discontinuation, the dog remained free of clinical signs for 1 year until it was again presented for polyuria/polydipsia with fasting hyperglycemia and glucosuria. Insulin therapy was resumed and continued for the remainder of the dog's life. Although diabetic remission often occurs in cats and humans, the presumed etiopathogenesis of pancreatic beta cell loss makes remission rare in dogs, except for cases occurring with diestrus or pregnancy. This case demonstrates that diabetic remission is possible in dogs, even in cases without an identifiable reversible trigger.
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Affiliation(s)
- Mariola B. Rak
- Department of Small Animal Clinical Sciences at the College of Veterinary MedicineUniversity of TennesseeKnoxvilleTennesseeUSA
| | - Chen Gilor
- Department of Small Animal Clinical SciencesCollege of Veterinary Medicine, University of FloridaGainesvilleFloridaUSA
| | - Stijn J. M. Niessen
- Department of Clinical Science and ServicesRoyal Veterinary College, University of LondonHertfordshireUK
- Veterinary Specialist Consultations & VIN EuropeHilversumThe Netherlands
| | - Eva Furrow
- Department of Veterinary Clinical SciencesCollege of Veterinary Medicine, University of MinnesotaSt. PaulMinnesotaUSA
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Rabbani N, Thornalley PJ. Hexokinase-linked glycolytic overload and unscheduled glycolysis in hyperglycemia-induced pathogenesis of insulin resistance, beta-cell glucotoxicity, and diabetic vascular complications. Front Endocrinol (Lausanne) 2024; 14:1268308. [PMID: 38292764 PMCID: PMC10824962 DOI: 10.3389/fendo.2023.1268308] [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] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 12/12/2023] [Indexed: 02/01/2024] Open
Abstract
Hyperglycemia is a risk factor for the development of insulin resistance, beta-cell glucotoxicity, and vascular complications of diabetes. We propose the hypothesis, hexokinase-linked glycolytic overload and unscheduled glycolysis, in explanation. Hexokinases (HKs) catalyze the first step of glucose metabolism. Increased flux of glucose metabolism through glycolysis gated by HKs, when occurring without concomitant increased activity of glycolytic enzymes-unscheduled glycolysis-produces increased levels of glycolytic intermediates with overspill into effector pathways of cell dysfunction and pathogenesis. HK1 is saturated with glucose in euglycemia and, where it is the major HK, provides for basal glycolytic flux without glycolytic overload. HK2 has similar saturation characteristics, except that, in persistent hyperglycemia, it is stabilized to proteolysis by high intracellular glucose concentration, increasing HK activity and initiating glycolytic overload and unscheduled glycolysis. This drives the development of vascular complications of diabetes. Similar HK2-linked unscheduled glycolysis in skeletal muscle and adipose tissue in impaired fasting glucose drives the development of peripheral insulin resistance. Glucokinase (GCK or HK4)-linked glycolytic overload and unscheduled glycolysis occurs in persistent hyperglycemia in hepatocytes and beta-cells, contributing to hepatic insulin resistance and beta-cell glucotoxicity, leading to the development of type 2 diabetes. Downstream effector pathways of HK-linked unscheduled glycolysis are mitochondrial dysfunction and increased reactive oxygen species (ROS) formation; activation of hexosamine, protein kinase c, and dicarbonyl stress pathways; and increased Mlx/Mondo A signaling. Mitochondrial dysfunction and increased ROS was proposed as the initiator of metabolic dysfunction in hyperglycemia, but it is rather one of the multiple downstream effector pathways. Correction of HK2 dysregulation is proposed as a novel therapeutic target. Pharmacotherapy addressing it corrected insulin resistance in overweight and obese subjects in clinical trial. Overall, the damaging effects of hyperglycemia are a consequence of HK-gated increased flux of glucose metabolism without increased glycolytic enzyme activities to accommodate it.
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Affiliation(s)
| | - Paul J. Thornalley
- College of Health and Life Sciences, Hamad Bin Khalifa University, Doha, Qatar
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Ikewaki N, Sonoda T, Kurosawa G, Iwasaki M, Devaprasad Dedeepiya V, Senthilkumar R, Preethy S, Abraham S. Beta 1,3-1,6 Glucans Produced by Two Novel Strains of Aureobasidium Pullulans Exert Immune and Metabolic Beneficial Effects in Healthy Middle-aged Japanese Men: Results of an Exploratory Randomized Control Study. JAR Life 2023; 12:61-71. [PMID: 37637272 PMCID: PMC10457473 DOI: 10.14283/jarlife.2023.11] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 06/13/2023] [Indexed: 08/29/2023]
Abstract
Objectives In this pilot study, we have evaluated the specific metabolic and immune-related benefits of the AFO-202 strain and N-163 strain of black yeast Aureobasidium pullulans-produced beta 1,3-1,6 glucan in healthy human subjects. Methods Sixteen healthy Japanese male volunteers (aged 40 to 60 years) took part in this clinical trial. They were divided into four groups (n = 4 each): Group I consumed AFO-202 beta-glucan (2 sachets of 1 g each per day), IA for 35 days and IB for 21 days; Group II consumed a combination of AFO-202 beta-glucan (2 sachets of 1 g each) and N-163 beta-glucan (1 sachet of 15 g gel each per day), IIA for 35 days and IIB for 21 days. Results Decrease in HbA1C and glycated albumin (GA), significant increase of eosinophils and monocytes and marginal decrease in D-dimer levels, decrease in neutrophil-to-lymphocyte ratio (NLR), with an increase in the lymphocyte-to-CRP ratio (LCR) and leukocyte-to-CRP ratio (LeCR) was observed in Group I between pre- and post-treatment. Decrease in total and LDL cholesterol, a decrease of CD11b, serum ferritin, galectin-3 and fibrinogen were profound in Group II between pre- and post-treatment. However, there was no statistically significant difference between day 21 and day 35 among the groups. Conclusion This outcome warrants larger clinical trials to explore the potentials of these safe food supplements in the prevention and prophylaxis of diseases due to dysregulated metabolism, such as fatty liver disease, and infections such as COVID-19 in which balanced immunomodulation are of utmost importance, besides their administration as an adjunct to existing therapeutic approaches of both communicable and non-communicable diseases.
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Affiliation(s)
- N. Ikewaki
- Dept. of Medical Life Science, Kyushu University of Health and Welfare, Japan
- Institute of Immunology, Junsei Educational Institute, Nobeoka, Miyazaki, Japan
| | - T. Sonoda
- Institute of Immunology, Junsei Educational Institute, Nobeoka, Miyazaki, Japan
| | - G. Kurosawa
- Department of Academic Research Support Promotion Facility, Center for Research Promotion and Support, Fujita Health University, Aichi, Japan
- MabGenesis KK, Nagoya, Japan
| | - M. Iwasaki
- Centre for Advancing Clinical Research (CACR), University of Yamanashi - School of Medicine, Chuo, Japan
| | - V. Devaprasad Dedeepiya
- Mary-Yoshio Translational Hexagon (MYTH), Nichi-In Centre for Regenerative Medicine (NCRM), Chennai, India
| | - R. Senthilkumar
- Fujio-Eiji Academic Terrain (FEAT), Nichi-In Centre for Regenerative Medicine (NCRM), Chennai, India
- Antony- Xavier Interdisciplinary Scholastics (AXIS), GN Corporation Co. Ltd., Kofu, Japan
| | - S. Preethy
- Fujio-Eiji Academic Terrain (FEAT), Nichi-In Centre for Regenerative Medicine (NCRM), Chennai, India
| | - S.J.K. Abraham
- Centre for Advancing Clinical Research (CACR), University of Yamanashi - School of Medicine, Chuo, Japan
- Mary-Yoshio Translational Hexagon (MYTH), Nichi-In Centre for Regenerative Medicine (NCRM), Chennai, India
- Antony- Xavier Interdisciplinary Scholastics (AXIS), GN Corporation Co. Ltd., Kofu, Japan
- R & D, Sophy Inc., Japan
- Levy-Jurgen Transdisciplinary Exploratory (LJTE), Global Niche Corp, Wilmington, DE, USA
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Mylonas N, Drosatos K, Mia S. The role of glucose in cardiac physiology and pathophysiology. Curr Opin Clin Nutr Metab Care 2023; 26:323-329. [PMID: 37144457 PMCID: PMC10309161 DOI: 10.1097/mco.0000000000000943] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
PURPOSE OF REVIEW Heart failure is one of the major causes of death worldwide and continues to increase despite therapeutics and pharmacology advances. Fatty acids and glucose are used as ATP-producing fuels in heart to meet its energy demands. However, dysregulation of metabolites' use plays a pivotal role in cardiac diseases. How glucose becomes toxic or drives cardiac dysfunction is incompletely understood. In the present review, we summarize the recent findings on cardiac cellular and molecular events that are driven by glucose during pathologic conditions and potential therapeutic strategies to tackle hyperglycemia-mediated cardiac dysfunction. RECENT FINDINGS Several studies have emerged recently, demonstrating that excessive glucose utilization has been correlated with impairment of cellular metabolic homeostasis primarily driven by mitochondrial dysfunction and damage, oxidative stress, and abnormal redox signaling. This disturbance is associated with cardiac remodeling, hypertrophy, and systolic and diastolic dysfunction. Both human and animal heart failure studies, report that glucose is a preferable fuel at the expense of fatty acid oxidation during ischemia and hypertrophy, but the opposite happens in diabetic hearts, which warrants further investigation. SUMMARY A better understanding of glucose metabolism and its fate during distinct types of heart disease will contribute to developing novel therapeutic options for the prevention and treatment of heart failure.
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Affiliation(s)
- Nikolaos Mylonas
- Metabolic Biology Laboratory, Department of Pharmacology & Systems Physiology, College of Medicine, University of Cincinnati, Ohio, OH, USA
- Laboratory of Pharmacology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
| | - Konstantinos Drosatos
- Metabolic Biology Laboratory, Department of Pharmacology & Systems Physiology, College of Medicine, University of Cincinnati, Ohio, OH, USA
| | - Sobuj Mia
- Metabolic Biology Laboratory, Department of Pharmacology & Systems Physiology, College of Medicine, University of Cincinnati, Ohio, OH, USA
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Yadav N, Palkhede JD, Kim SY. Anti- Glucotoxicity Effect of Phytoconstituents via Inhibiting MGO-AGEs Formation and Breaking MGO-AGEs. Int J Mol Sci 2023; 24:ijms24087672. [PMID: 37108833 PMCID: PMC10141761 DOI: 10.3390/ijms24087672] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/16/2023] [Accepted: 04/18/2023] [Indexed: 04/29/2023] Open
Abstract
The therapeutic benefits of phytochemicals in the treatment of various illnesses and disorders are well documented. They show significant promise for the discovery and creation of novel medications for treating a variety of human diseases. Numerous phytoconstituents have shown antibiotic, antioxidant, and wound-healing effects in the conventional system. Traditional medicines based on alkaloids, phenolics, tannins, saponins, terpenes, steroids, flavonoids, glycosides, and phytosterols have been in use for a long time and are crucial as alternative treatments. These phytochemical elements are crucial for scavenging free radicals, capturing reactive carbonyl species, changing protein glycation sites, inactivating carbohydrate hydrolases, fighting pathological conditions, and accelerating the healing of wounds. In this review, 221 research papers have been reviewed. This research sought to provide an update on the types and methods of formation of methylglyoxal-advanced glycation end products (MGO-AGEs) and molecular pathways induced by AGEs during the progression of the chronic complications of diabetes and associated diseases as well as to discuss the role of phytoconstituents in MGO scavenging and AGEs breaking. The development and commercialization of functional foods using these natural compounds can provide potential health benefits.
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Affiliation(s)
- Neera Yadav
- College of Pharmacy, Gachon University, #191, Hambakmoero, Yeonsu-gu, Incheon 21936, Republic of Korea
- School of Medicine, Kyung Hee University, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Jyoti Dnyaneshwar Palkhede
- Department of Chemistry, College of Pharmacy, Gachon University, #191, Hambakmoero, Yeonsu-gu, Incheon 21936, Republic of Korea
| | - Sun-Yeou Kim
- College of Pharmacy, Gachon University, #191, Hambakmoero, Yeonsu-gu, Incheon 21936, Republic of Korea
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Lakshman R, Daly AB, Nwokolo M, Hartnell S, Wilinska ME, Cezar A, Evans ML, Hovorka R, Boughton CK. Insulin Requirements Over Eight Weeks of Fully Closed-Loop Insulin Delivery in Adults With Type 2 Diabetes. J Diabetes Sci Technol 2023; 17:868-870. [PMID: 36912020 DOI: 10.1177/19322968231159412] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/14/2023]
Affiliation(s)
- Rama Lakshman
- Wellcome-MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK
| | - Aideen B Daly
- Wellcome-MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK
| | - Munachiso Nwokolo
- Wellcome-MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK
| | - Sara Hartnell
- Wolfson Diabetes and Endocrine Clinic, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | | | - Alina Cezar
- Wellcome-MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK
| | - Mark L Evans
- Wellcome-MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK
- Wolfson Diabetes and Endocrine Clinic, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Roman Hovorka
- Wellcome-MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK
| | - Charlotte K Boughton
- Wellcome-MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK
- Wolfson Diabetes and Endocrine Clinic, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
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11
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Kohara Y, Ikai S, Yoshihara A, Murao K, Sugiyama Y. Effect of chronic exposure to ketohexoses on pancreatic β-cell function in INS-1 rat insulinoma cells. Biosci Biotechnol Biochem 2023; 87:163-170. [PMID: 36413460 DOI: 10.1093/bbb/zbac190] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Accepted: 11/16/2022] [Indexed: 11/23/2022]
Abstract
Glucotoxicity, impaired insulin secretion, suppression of insulin gene expression, and apoptosis, in pancreatic β-cells caused by chronic hyperglycemia is a key component of the pathogenesis of type 2 diabetes. Recently, it has been reported that rare sugar d-allulose has antihyperglycemic and antihyperlipidemic effects in diabetic rats. However, the direct effects of rare sugars including d-allulose on pancreatic β-cell function are unclear. In this study, we investigated whether chronic exposure to ketohexoses causes glucotoxicity, suppression of insulin gene expression, and apoptosis, in INS-1 rat pancreatic insulinoma cells. d-Fructose, d-tagatose, l-allulose, and l-sorbose treatment for 1-week reduced insulin gene expression, whereas d-allulose, d-sorbose, l-fructose, and l-tagatose did not. All ketohexoses were transported into INS-1 cells, but were not metabolized. In addition, the ketohexoses did not induce apoptosis and did not affect glucose metabolism. These results suggest that long-term administration of d-allulose, d-sorbose, l-fructose, and l-tagatose does not affect pancreatic β-cell function.
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Affiliation(s)
- Yuri Kohara
- Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa, Japan
| | - Shuta Ikai
- Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa, Japan
| | - Akihide Yoshihara
- International Institute of Rare Sugar Research and Education, Kagawa University, Miki, Kagawa, Japan
| | - Koji Murao
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, Miki, Kagawa, Japan
| | - Yasunori Sugiyama
- Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa, Japan
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Papadopoulos C, Anagnostopoulos K, Tsiptsios D, Karatzetzou S, Liaptsi E, Lazaridou IZ, Kokkotis C, Makri E, Ioannidou M, Aggelousis N, Vadikolias K. Unexplored Roles of Erythrocytes in Atherothrombotic Stroke. Neurol Int 2023; 15:124-139. [PMID: 36810466 PMCID: PMC9944955 DOI: 10.3390/neurolint15010011] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 01/16/2023] [Accepted: 01/19/2023] [Indexed: 01/25/2023] Open
Abstract
Stroke constitutes the second highest cause of morbidity and mortality worldwide while also impacting the world economy, triggering substantial financial burden in national health systems. High levels of blood glucose, homocysteine, and cholesterol are causative factors for atherothrombosis. These molecules induce erythrocyte dysfunction, which can culminate in atherosclerosis, thrombosis, thrombus stabilization, and post-stroke hypoxia. Glucose, toxic lipids, and homocysteine result in erythrocyte oxidative stress. This leads to phosphatidylserine exposure, promoting phagocytosis. Phagocytosis by endothelial cells, intraplaque macrophages, and vascular smooth muscle cells contribute to the expansion of the atherosclerotic plaque. In addition, oxidative stress-induced erythrocytes and endothelial cell arginase upregulation limit the pool for nitric oxide synthesis, leading to endothelial activation. Increased arginase activity may also lead to the formation of polyamines, which limit the deformability of red blood cells, hence facilitating erythrophagocytosis. Erythrocytes can also participate in the activation of platelets through the release of ADP and ATP and the activation of death receptors and pro-thrombin. Damaged erythrocytes can also associate with neutrophil extracellular traps and subsequently activate T lymphocytes. In addition, reduced levels of CD47 protein in the surface of red blood cells can also lead to erythrophagocytosis and a reduced association with fibrinogen. In the ischemic tissue, impaired erythrocyte 2,3 biphosphoglycerate, because of obesity or aging, can also favor hypoxic brain inflammation, while the release of damage molecules can lead to further erythrocyte dysfunction and death.
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Affiliation(s)
- Charalampos Papadopoulos
- Laboratory of Biochemistry, Department of Medicine, Democritus University of Thrace, 68100 Alexandroupolis, Greece
| | - Konstantinos Anagnostopoulos
- Laboratory of Biochemistry, Department of Medicine, Democritus University of Thrace, 68100 Alexandroupolis, Greece
| | - Dimitrios Tsiptsios
- Department of Neurology, Democritus University of Thrace, 68100 Alexandroupolis, Greece
- Correspondence:
| | - Stella Karatzetzou
- Department of Neurology, Democritus University of Thrace, 68100 Alexandroupolis, Greece
| | - Eirini Liaptsi
- Department of Neurology, Democritus University of Thrace, 68100 Alexandroupolis, Greece
| | | | - Christos Kokkotis
- Department of Physical Education and Sport Science, Democritus University of Thrace, 69100 Komotini, Greece
| | - Evangelia Makri
- Department of Physical Education and Sport Science, Democritus University of Thrace, 69100 Komotini, Greece
| | - Maria Ioannidou
- Department of Physical Education and Sport Science, Democritus University of Thrace, 69100 Komotini, Greece
| | - Nikolaos Aggelousis
- Department of Physical Education and Sport Science, Democritus University of Thrace, 69100 Komotini, Greece
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13
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Ushakov A, Ivanchenko V, Gagarina A. Heart Failure And Type 2 Diabetes Mellitus: Neurohumoral, Histological And Molecular Interconnections. Curr Cardiol Rev 2023; 19:e170622206132. [PMID: 35718961 PMCID: PMC10201898 DOI: 10.2174/1573403x18666220617121144] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 04/27/2022] [Accepted: 05/04/2022] [Indexed: 11/22/2022] Open
Abstract
Heart failure (HF) is a global healthcare burden and a leading cause of morbidity and mortality worldwide. Type 2 diabetes mellitus (T2DM) appears to be one of the major risk factors that significantly worsen HF prognosis and increase the risk of fatal cardiovascular outcomes. Despite a great knowledge of pathophysiological mechanisms involved in HF development and progression, hospitalization rates in patients with HF and concomitant T2DM remain elevated. In this review, we discuss the complex interplay between systemic neurohumoral regulation and local cardiac mechanisms participating in myocardial remodeling and HF development in T2DM with special attention to cardiomyocyte energy metabolism, mitochondrial function and calcium metabolism, cardiomyocyte hypertrophy and death, extracellular matrix remodeling.
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Affiliation(s)
- A. Ushakov
- Department of Internal Medicine 1, Medical Academy named after S.I. Georgievsky of V.I. Vernadsky Crimean Federal University, Simferopol, Russian Federation
| | - V. Ivanchenko
- Department of Internal Medicine 1, Medical Academy named after S.I. Georgievsky of V.I. Vernadsky Crimean Federal University, Simferopol, Russian Federation
| | - A. Gagarina
- Department of Internal Medicine 1, Medical Academy named after S.I. Georgievsky of V.I. Vernadsky Crimean Federal University, Simferopol, Russian Federation
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14
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Dhar A, Venkadakrishnan J, Roy U, Vedam S, Lalwani N, Ramos KS, Pandita TK, Bhat A. A comprehensive review of the novel therapeutic targets for the treatment of diabetic cardiomyopathy. Ther Adv Cardiovasc Dis 2023; 17:17539447231210170. [PMID: 38069578 PMCID: PMC10710750 DOI: 10.1177/17539447231210170] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 10/09/2023] [Indexed: 12/18/2023] Open
Abstract
Diabetic cardiomyopathy (DCM) is characterized by structural and functional abnormalities in the myocardium affecting people with diabetes. Treatment of DCM focuses on glucose control, blood pressure management, lipid-lowering, and lifestyle changes. Due to limited therapeutic options, DCM remains a significant cause of morbidity and mortality in patients with diabetes, thus emphasizing the need to develop new therapeutic strategies. Ongoing research is aimed at understanding the underlying molecular mechanism(s) involved in the development and progression of DCM, including oxidative stress, inflammation, and metabolic dysregulation. The goal is to develope innovative pharmaceutical therapeutics, offering significant improvements in the clinical management of DCM. Some of these approaches include the effective targeting of impaired insulin signaling, cardiac stiffness, glucotoxicity, lipotoxicity, inflammation, oxidative stress, cardiac hypertrophy, and fibrosis. This review focuses on the latest developments in understanding the underlying causes of DCM and the therapeutic landscape of DCM treatment.
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Affiliation(s)
- Arti Dhar
- Department of Pharmacy, Birla Institute of Technology and Science Pilani, Hyderabad, Telangana, India
| | | | - Utsa Roy
- Department of Pharmacy, Birla Institute of Technology and Science Pilani, Hyderabad, Telangana, India
| | - Sahithi Vedam
- Department of Pharmacy, Birla Institute of Technology and Science Pilani, Hyderabad, Telangana, India
| | - Nikita Lalwani
- Department of Pharmacy, Birla Institute of Technology and Science Pilani, Hyderabad, Telangana, India
| | - Kenneth S. Ramos
- Center for Genomics and Precision Medicine, Texas A&M College of Medicine, Houston, TX 77030, USA
| | - Tej K. Pandita
- Center for Genomics and Precision Medicine, Texas A&M College of Medicine, Houston, TX 77030, USA
| | - Audesh Bhat
- Centre for Molecular Biology, Central University of Jammu, Samba, Jammu and Kashmir (UT) 184311, India
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15
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Shannon CE, Merovci A, Fourcaudot M, Tripathy D, Abdul-Ghani M, Wang H, Han X, Norton L, DeFronzo RA. Effects of Sustained Hyperglycemia on Skeletal Muscle Lipids in Healthy Subjects. J Clin Endocrinol Metab 2022; 107:e3177-e3185. [PMID: 35552423 PMCID: PMC9282260 DOI: 10.1210/clinem/dgac306] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Indexed: 11/19/2022]
Abstract
CONTEXT Sustained increases in plasma glucose promote skeletal muscle insulin resistance independent from obesity and dyslipidemia (ie, glucotoxicity). Skeletal muscle lipids are key molecular determinants of insulin action, yet their involvement in the development of glucotoxicity is unclear. OBJECTIVE To explore the impact of mild physiologic hyperglycemia on skeletal muscle lipids. DESIGN Single group pretest-posttest. PARTICIPANTS Healthy males and females with normal glucose tolerance. INTERVENTIONS 72-hour glucose infusion raising plasma glucose by ~50 mg/dL. MAIN OUTCOME MEASURES Skeletal muscle lipids, insulin sensitivity, lipid oxidation. RESULTS Despite impairing insulin-mediated glucose disposal and suppressing fasting lipid oxidation, hyperglycemia did not alter either the content or composition of skeletal muscle triglycerides, diacylglycerides, or phospholipids. Skeletal muscle ceramides decreased after glucose infusion, likely in response to a reduction in free fatty acid concentrations. CONCLUSIONS Our results demonstrate that the major lipid pools in skeletal muscle are unperturbed by sustained increases in glucose availability and suggest that glucotoxicity and lipotoxicity drive insulin resistance through distinct mechanistic pathways.
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Affiliation(s)
- Christopher E Shannon
- Correspondence: Christopher E Shannon, PhD, UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland. ; Division of Diabetes, Department of Medicine, UT Health San Antonio, San Antonio, TX, USA.
| | - Aurora Merovci
- Division of Diabetes, Department of Medicine, UT Health San Antonio, San Antonio, TX, USA
| | - Marcel Fourcaudot
- Division of Diabetes, Department of Medicine, UT Health San Antonio, San Antonio, TX, USA
| | - Devjit Tripathy
- Division of Diabetes, Department of Medicine, UT Health San Antonio, San Antonio, TX, USA
- Audie L Murphy VA Hospital, South Texas Veterans Health Care System, San Antonio, TX, USA
| | - Muhammad Abdul-Ghani
- Division of Diabetes, Department of Medicine, UT Health San Antonio, San Antonio, TX, USA
| | - Hu Wang
- Barshop Institute for Longevity and Aging Studies, UT Health San Antonio, San Antonio, TX, USA
| | - Xianlin Han
- Division of Diabetes, Department of Medicine, UT Health San Antonio, San Antonio, TX, USA
- Barshop Institute for Longevity and Aging Studies, UT Health San Antonio, San Antonio, TX, USA
| | - Luke Norton
- Division of Diabetes, Department of Medicine, UT Health San Antonio, San Antonio, TX, USA
| | - Ralph A DeFronzo
- Division of Diabetes, Department of Medicine, UT Health San Antonio, San Antonio, TX, USA
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16
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D’Angelo CV, West HL, Whitticar NB, Corbin KL, Donovan LM, Stiadle BI, Nunemaker CS. Similarities in Calcium Oscillations Between Neonatal Mouse Islets and Mature Islets Exposed to Chronic Hyperglycemia. Endocrinology 2022; 163:6585503. [PMID: 35551371 PMCID: PMC9186310 DOI: 10.1210/endocr/bqac066] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Indexed: 11/19/2022]
Abstract
Pulsatility is important to islet function. As islets mature into fully developed insulin-secreting micro-organs, their ability to produce oscillatory intracellular calcium ([Ca2+]i) patterns in response to glucose also matures. In this study, we measured [Ca2+]i using fluorescence imaging to characterize oscillations from neonatal mice on postnatal (PN) days 0, 4, and 12 in comparison to adult islets. Under substimulatory (3-mM) glucose levels, [Ca2+]i was low and quiescent for adult islets as expected, as well as for PN day 12 islets. In contrast, one-third of islets on PN day 0 and 4 displayed robust [Ca2+]i oscillations in low glucose. In stimulatory glucose (11 mM) conditions, oscillations were present on all neonatal days but differed from patterns in adults. By PN day 12, [Ca2+]i oscillations were approaching characteristics of fully developed islets. The immature response pattern of neonatal islets was due, at least in part, to differences in adenosine 5'-triphosphate (ATP)-sensitive K+-channel activity estimated by [Ca2+]i responses to KATP channel agents diazoxide and tolbutamide. Neonatal [Ca2+]i patterns were also strikingly similar to patterns observed in mature islets exposed to hyperglycemic conditions (20 mM glucose for 48 hours): elevated [Ca2+]i and oscillations in low glucose along with reduced pulse mass in high glucose. Since a hallmark of diabetic islets is dedifferentiation, we propose that diabetic islets display features of "reverse maturation," demonstrating similar [Ca2+]i dynamics as neonatal islets. Pulsatility is thus an important emergent feature of neonatal islets. Our findings may provide insight into reversing β-cell dedifferentiation and to producing better functioning β cells from pluripotent stem cells.
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Affiliation(s)
- Cathleen V D’Angelo
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701, USA
| | - Hannah L West
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701, USA
- Honors Tutorial College, Ohio University, Athens, Ohio 45701, USA
| | - Nicholas B Whitticar
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701, USA
- Translational Biomedical Sciences Program, Graduate College, Ohio University, Athens, Ohio 45701, USA
| | - Kathryn L Corbin
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701, USA
- Diabetes Institute, Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701, USA
| | - Lauren M Donovan
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701, USA
| | - Benjamin I Stiadle
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701, USA
| | - Craig S Nunemaker
- Correspondence: Craig S. Nunemaker, PhD, Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, 1 Ohio University, Athens, OH 45701, USA.
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17
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Papadopoulos C. Erythrocyte Glucotoxicity Results in Vascular Inflammation. Endocr Metab Immune Disord Drug Targets 2022; 22:901-903. [PMID: 35507805 DOI: 10.2174/1871530322666220430013334] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 03/02/2022] [Accepted: 03/08/2022] [Indexed: 11/22/2022]
Affiliation(s)
- Charalampos Papadopoulos
- Department of Medicine, Faculty of Health Sciences, Democritus University of Thrace, Alexandroupolis, Greece
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18
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Wen WL, Huang HC, Lin HC, Lo WC, Chen SC, Lee MY. Greater Glycemic Burden Is Associated with Further Poorer Glycemic Control in Newly-Diagnosed Type 2 Diabetes Mellitus Patients. Nutrients 2022; 14:nu14020320. [PMID: 35057503 PMCID: PMC8780525 DOI: 10.3390/nu14020320] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 01/09/2022] [Accepted: 01/11/2022] [Indexed: 11/16/2022] Open
Abstract
Aims: hyperglycemia impairs pancreatic β-cell function instantly, also known as glucotoxicity. It is unknown whether this insult is temporary or sustained, and little real-world evidence needs to reflect the relationship between hyperglycemic burden, per se, and glycemic durability. Materials and Methods: a retrospective observational cohort study was conducted to recruit newly-diagnosed type 2 diabetes mellitus (T2DM) patients. Durability was defined as the episode from first glycated hemoglobin A1c (HbA1c) below 7.0% to where it exceed 8.0% (with treatment failure) or where study ended (without treatment failure). Glycemic burden was defined with the area above a burden value line (HbA1c = 6.5%) but under the HbA1c curve (AUC), and it was then divided into two compartments with the demarcation timepoint once HbA1c was treated below or equal to 7.0%; the former AUC' represented the initial insult; the latter AUC" represented the residual part. Multivariable regression models assessed factors associated with durability in whole participants and two distinct subgroups: patients with baseline HbA1c > 7.0% or ≤7.0%. Results: 1048 eligible participants were recruited and analyzed: 291 patients with treatment failure (durability 26.8 ± 21.1 months); 757 patients without treatment failure (durability 45.1 ± 31.8 months). Besides age, glycemic burden was the only constant determinant in the two subgroups. AUC' or AUC" increased treatment failure, respectively, in baseline HbA1c > 7.0% or ≤7.0% subgroup [per 1%/90 days hazard ratio (95% confidence interval): 1.026 (1.018-1.034) and 1.128 (1.016-1.253)]. Other determinants include baseline HbA1c, initial OAD, and education level. Conclusions: in patients with newly-diagnosed T2DM, glycemic durability was negatively associated with greater glycemic burden.
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Affiliation(s)
- Wei-Lun Wen
- Department of Internal Medicine, Lee’s Endocrinology Clinic, Pingtung City 900, Taiwan;
- Department of Internal Medicine, Kaohsiung Municipal Siaogang Hospital, Kaohsiung Medical University, Kaohsiung 812, Taiwan
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
| | - Hui-Chun Huang
- Department of Electronics Engineering, Institute of Electronics, National Chiao Tung University, Hsinchu 300, Taiwan;
- Hengchun Navaids Site, Kaohsiung Aviation Facilities Sector, Air Navigation and Weather Services, Ministry of Transportation and Communications, Hengchun 946, Taiwan
| | - Hsiu-Chu Lin
- Certified Diabetic Educator of Endocrinology & Metabolism Ward, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan;
| | - Wan-Ching Lo
- Department of Nursing, Kaohsiung Municipal Siaogang Hospital, Kaohsiung 812, Taiwan;
| | - Szu-Chia Chen
- Department of Internal Medicine, Kaohsiung Municipal Siaogang Hospital, Kaohsiung Medical University, Kaohsiung 812, Taiwan
- Division of Nephrology, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 807, Taiwan
- Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
- Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
- Correspondence: (S.-C.C.); (M.-Y.L.)
| | - Mei-Yueh Lee
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
- Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
- Correspondence: (S.-C.C.); (M.-Y.L.)
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19
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Schiavon M, Gastaldelli A. Editorial: Mechanisms for the Alteration in the Crosstalk Among Insulin-Sensitive Tissues. Front Endocrinol (Lausanne) 2022; 13:883659. [PMID: 35498427 PMCID: PMC9049211 DOI: 10.3389/fendo.2022.883659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 03/07/2022] [Indexed: 11/28/2022] Open
Affiliation(s)
- Michele Schiavon
- Department of Information Engineering, University of Padova, Padova, Italy
- *Correspondence: Michele Schiavon, ; Amalia Gastaldelli,
| | - Amalia Gastaldelli
- Institute of Clinical Physiology, Italian National Research Council, Pisa, Italy
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20
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Oberhauser L, Maechler P. Lipid-Induced Adaptations of the Pancreatic Beta-Cell to Glucotoxic Conditions Sustain Insulin Secretion. Int J Mol Sci 2021; 23:324. [PMID: 35008750 PMCID: PMC8745448 DOI: 10.3390/ijms23010324] [Citation(s) in RCA: 1] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/22/2021] [Accepted: 12/27/2021] [Indexed: 12/16/2022] Open
Abstract
Over the last decades, lipotoxicity and glucotoxicity emerged as established mechanisms participating in the pathophysiology of obesity-related type 2 diabetes in general, and in the loss of β-cell function in particular. However, these terms hold various potential biological processes, and it is not clear what precisely they refer to and to what extent they might be clinically relevant. In this review, we discuss the basis and the last advances of research regarding the role of free fatty acids, their metabolic intracellular pathways, and receptor-mediated signaling related to glucose-stimulated insulin secretion, as well as lipid-induced β-cell dysfunction. We also describe the role of chronically elevated glucose, namely, glucotoxicity, which promotes failure and dedifferentiation of the β cell. Glucolipotoxicity combines deleterious effects of exposures to both high glucose and free fatty acids, supposedly provoking synergistic defects on the β cell. Nevertheless, recent studies have highlighted the glycerolipid/free fatty acid cycle as a protective pathway mediating active storage and recruitment of lipids. Finally, we discuss the putative correspondence of the loss of functional β cells in type 2 diabetes with a natural, although accelerated, aging process.
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Affiliation(s)
| | - Pierre Maechler
- Department of Cell Physiology and Metabolism, Faculty Diabetes Center, University of Geneva Medical Center, 1206 Geneva, Switzerland;
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21
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Pignalosa FC, Desiderio A, Mirra P, Nigro C, Perruolo G, Ulianich L, Formisano P, Beguinot F, Miele C, Napoli R, Fiory F. Diabetes and Cognitive Impairment: A Role for Glucotoxicity and Dopaminergic Dysfunction. Int J Mol Sci 2021; 22:ijms222212366. [PMID: 34830246 PMCID: PMC8619146 DOI: 10.3390/ijms222212366] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 11/09/2021] [Accepted: 11/13/2021] [Indexed: 12/13/2022] Open
Abstract
Diabetes mellitus (DM) is a chronic metabolic disorder characterized by hyperglycemia, responsible for the onset of several long-term complications. Recent evidence suggests that cognitive dysfunction represents an emerging complication of DM, but the underlying molecular mechanisms are still obscure. Dopamine (DA), a neurotransmitter essentially known for its relevance in the regulation of behavior and movement, modulates cognitive function, too. Interestingly, alterations of the dopaminergic system have been observed in DM. This review aims to offer a comprehensive overview of the most relevant experimental results assessing DA’s role in cognitive function, highlighting the presence of dopaminergic dysfunction in DM and supporting a role for glucotoxicity in DM-associated dopaminergic dysfunction and cognitive impairment. Several studies confirm a role for DA in cognition both in animal models and in humans. Similarly, significant alterations of the dopaminergic system have been observed in animal models of experimental diabetes and in diabetic patients, too. Evidence is accumulating that advanced glycation end products (AGEs) and their precursor methylglyoxal (MGO) are associated with cognitive impairment and alterations of the dopaminergic system. Further research is needed to clarify the molecular mechanisms linking DM-associated dopaminergic dysfunction and cognitive impairment and to assess the deleterious impact of glucotoxicity.
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Affiliation(s)
- Francesca Chiara Pignalosa
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
| | - Antonella Desiderio
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
| | - Paola Mirra
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
| | - Cecilia Nigro
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
| | - Giuseppe Perruolo
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
| | - Luca Ulianich
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
| | - Pietro Formisano
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
| | - Francesco Beguinot
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
| | - Claudia Miele
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
- Correspondence: ; Tel.: +39-081-746-3248
| | - Raffaele Napoli
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
| | - Francesca Fiory
- Department of Translational Medical Sciences, University of Naples Federico II, 80131 Naples, Italy; (F.C.P.); (A.D.); (P.M.); (C.N.); (G.P.); (L.U.); (P.F.); (F.B.); (R.N.); (F.F.)
- URT “Genomic of Diabetes”, Institute of Experimental Endocrinology and Oncology, National Research Council, 80131 Naples, Italy
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22
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Zeman RJ, Wen X, Ouyang N, Brown AM, Etlinger JD. Role of the Polyol Pathway in Locomotor Recovery and Wallerian Degeneration after Spinal Cord Contusion Injury. Neurotrauma Rep 2021; 2:411-423. [PMID: 34738094 PMCID: PMC8563458 DOI: 10.1089/neur.2021.0018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Spinal cord contusion injury leads to Wallerian degeneration of axonal tracts, resulting in irreversible paralysis. Contusion injury causes perfusion loss by thrombosis and vasospasm, resulting in spinal cord ischemia. In several tissues, including heart and brain, ischemia activates polyol pathway enzymes—aldose reductase (AR) and sorbitol dehydrogenase (SDH)—that convert glucose to sorbitol and fructose in reactions, causing oxidative stress and tissue loss. We sought to determine whether activation of this pathway, which has been termed glucotoxicity, contributes to tissue loss after spinal cord contusion injury. We tested individual treatments with AR inhibitors (sorbinil or ARI-809), SDH inhibitor (CP-470711), superoxide dismutase mimetic (tempol), or combined sorbinil and tempol. Each treatment significantly increased locomotor recovery and reduced loss of spinal cord tissue in a standard model of spinal cord contusion in rats. Tissue levels of sorbitol and axonal AR (AKR1B10) expression were increased after contusion injury, consistent with activation of the polyol pathway. Sorbinil treatment inhibited the above changes and also decreased axonal swelling and loss, characteristic of Wallerian degeneration. Treatment with tempol induced recovery of locomotor function that was similar in magnitude, but non-additive to sorbinil, suggesting a shared mechanism of action by reactive oxygen species (ROS). Exogenous induction of hyperglycemia further increased injury-induced axonal swelling, consistent with glucotoxicity. Unexpectedly, contusion increased spinal cord levels of glucose, the primary polyol pathway substrate. These results support roles for spinal glucose elevation and tissue glucotoxicity by the polyol pathway after spinal cord contusion injury that results in ROS-mediated axonal degeneration.
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Affiliation(s)
- Richard J Zeman
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, New York, USA.,MotoGen Inc., Mount Kisco, New York, USA
| | - Xialing Wen
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, New York, USA
| | - Nengtai Ouyang
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, New York, USA
| | - Abraham M Brown
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, New York, USA
| | - Joseph D Etlinger
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, New York, USA.,MotoGen Inc., Mount Kisco, New York, USA
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23
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Abstract
Non-alcoholic fatty liver disease (NAFLD) is a growing cause of chronic liver disease worldwide. It is characterised by steatosis, liver inflammation, hepatocellular injury and progressive fibrosis. Several preclinical models (dietary and genetic animal models) of NAFLD have deepened our understanding of its aetiology and pathophysiology. Despite the progress made, there are currently no effective treatments for NAFLD. In this review, we will provide an update on the known molecular pathways involved in the pathophysiology of NAFLD and on ongoing studies of new therapeutic targets.
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Key Words
- ACC, acetyl-CoA carboxylase
- ASK1, apoptosis signal-regulating kinase 1
- CAP, controlled attenuation parameter
- ChREBP
- ChREBP, carbohydrate responsive element–binding protein
- FAS, fatty acid synthase
- FFA, free fatty acid
- FGF21, fibroblast growth factor-21
- FXR
- FXR, farnesoid X receptor
- GGT, gamma glutamyltransferase
- HCC, hepatocellular carcinoma
- HFD, high-fat diet
- HSC, hepatic stellate cells
- HSL, hormone-sensitive lipase
- HVPG, hepatic venous pressure gradient
- IL-, interleukin-
- JNK, c-Jun N-terminal kinase
- LXR
- LXR, liver X receptor
- MCD, methionine- and choline-deficient
- MUFA, monounsaturated fatty acids
- NAFLD
- NAFLD, non-alcoholic fatty liver disease
- NASH
- NASH, non-alcoholic steatohepatitis
- NEFA
- NEFA, non-esterified fatty acid
- PPARα
- PPARα, peroxisome proliferator-activated receptor-α
- PUFAs, polyunsaturated fatty acids
- PY, persons/years
- Phf2, histone demethylase plant homeodomain finger 2
- RCT, randomised controlled trial
- SCD1, stearoyl-CoA desaturase-1
- SFA, saturated fatty acid
- SREBP-1c
- SREBP-1c, sterol regulatory element–binding protein-1c
- TCA, tricarboxylic acid
- TLR4, Toll-like receptor 4
- TNF-α, tumour necrosis factor-α
- VLDL, very low-density lipoprotein
- animal models
- glucotoxicity
- lipotoxicity
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Affiliation(s)
- Lucia Parlati
- Université de Paris, Institut Cochin, CNRS, INSERM, F- 75014 Paris, France.,Hôpital Cochin, 24, rue du Faubourg Saint Jacques, 75014 Paris, France
| | - Marion Régnier
- UCLouvain, Université catholique de Louvain, Walloon Excellence in Life Sciences and BIOtechnology, Louvain Drug Research Institute, Metabolism and Nutrition Research Group, Brussels, Belgium
| | - Hervé Guillou
- Toxalim, Université de Toulouse, INRA, ENVT, INP-Purpan, UPS, Toulouse 31027, France
| | - Catherine Postic
- Université de Paris, Institut Cochin, CNRS, INSERM, F- 75014 Paris, France
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24
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Mesto N, Bailbe D, Eskandar M, Pommier G, Gil S, Tolu S, Movassat J, Tourrel-Cuzin C. Involvement of P2Y signaling in the restoration of glucose-induced insulin exocytosis in pancreatic β cells exposed to glucotoxicity. J Cell Physiol 2021; 237:881-896. [PMID: 34435368 DOI: 10.1002/jcp.30564] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 07/27/2021] [Accepted: 08/13/2021] [Indexed: 12/14/2022]
Abstract
Purinergic P2Y receptors, by binding adenosine triphosphate (ATP), are known for enhancing glucose-stimulated insulin secretion (GSIS) in pancreatic β cells. However, the impact of these receptors in the actin dynamics and insulin granule exocytosis in these cells is not established, neither in normal nor in glucotoxic environment. In this study, we investigate the involvement of P2Y receptors on the behavior of insulin granules and the subcortical actin network dynamics in INS-1 832/13 β cells exposed to normal or glucotoxic environment and their role in GSIS. Our results show that the activation of P2Y purinergic receptors by ATP or its agonist increase the insulin granules exocytosis and the reorganization of the subcortical actin network and participate in the potentiation of GSIS. In addition, their activation in INS-1832/13 β-cells, with impaired insulin secretion following exposure to elevated glucose levels, restores GSIS competence through the distal steps of insulin exocytosis. These results are confirmed ex vivo by perifusion experiments on islets from type 2 diabetic (T2D) Goto-Kakizaki (GK) rats. Indeed, the P2Y receptor agonist restores the altered GSIS, which is normally lost in this T2D animal model. Moreover, we observed an improvement of the glucose tolerance, following the acute intraperitoneal injection of the P2Y agonist concomitantly with glucose, in diabetic GK rats. All these data provide new insights into the unprecedented therapeutic role of P2Y purinergic receptors in the pathophysiology of T2D.
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Affiliation(s)
- Nour Mesto
- 'Université de Paris' 'Unit of Functional and Adaptative Biology (BFA)', CNRS, UMR 8251, Team 'Biologie et Pathologie du Pancréas Endocrine', Paris, France
| | - Danielle Bailbe
- 'Université de Paris' 'Unit of Functional and Adaptative Biology (BFA)', CNRS, UMR 8251, Team 'Biologie et Pathologie du Pancréas Endocrine', Paris, France
| | - Myriam Eskandar
- 'Université de Paris' 'Unit of Functional and Adaptative Biology (BFA)', CNRS, UMR 8251, Team 'Biologie et Pathologie du Pancréas Endocrine', Paris, France
| | - Gaëlle Pommier
- 'Université de Paris' 'Unit of Functional and Adaptative Biology (BFA)', CNRS, UMR 8251, Team 'Biologie et Pathologie du Pancréas Endocrine', Paris, France
| | - Stéphanie Gil
- 'Université de Paris' 'Unit of Functional and Adaptative Biology (BFA)', CNRS, UMR 8251, Team 'Biologie et Pathologie du Pancréas Endocrine', Paris, France.,Université de Paris, UFR Sciences du Vivant (SDV), Paris, France
| | - Stefania Tolu
- 'Université de Paris' 'Unit of Functional and Adaptative Biology (BFA)', CNRS, UMR 8251, Team 'Biologie et Pathologie du Pancréas Endocrine', Paris, France
| | - Jamileh Movassat
- 'Université de Paris' 'Unit of Functional and Adaptative Biology (BFA)', CNRS, UMR 8251, Team 'Biologie et Pathologie du Pancréas Endocrine', Paris, France
| | - Cécile Tourrel-Cuzin
- 'Université de Paris' 'Unit of Functional and Adaptative Biology (BFA)', CNRS, UMR 8251, Team 'Biologie et Pathologie du Pancréas Endocrine', Paris, France
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25
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Filippello A, Di Mauro S, Scamporrino A, Malaguarnera R, Torrisi SA, Leggio GM, Di Pino A, Scicali R, Purrello F, Piro S. High Glucose Exposure Impairs L-Cell Differentiation in Intestinal Organoids: Molecular Mechanisms and Clinical Implications. Int J Mol Sci 2021; 22:6660. [PMID: 34206340 DOI: 10.3390/ijms22136660] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 06/17/2021] [Accepted: 06/18/2021] [Indexed: 02/07/2023] Open
Abstract
Intestinal organoids are used to analyze the differentiation of enteroendocrine cells (EECs) and to manipulate their density for treating type 2 diabetes. EEC differentiation is a continuous process tightly regulated in the gut by a complex regulatory network. However, the effect of chronic hyperglycemia, in the modulation of regulatory networks controlling identity and differentiation of EECs, has not been analyzed. This study aimed to investigate the effect of glucotoxicity on EEC differentiation in small intestinal organoid platforms. Mouse intestinal organoids were cultured in the presence/absence of high glucose concentrations (35 mM) for 48 h to mimic glucotoxicity. Chronic hyperglycemia impaired the expression of markers related to the differentiation of EEC progenitors (Ngn3) and L-cells (NeuroD1), and it also reduced the expression of Gcg and GLP-1 positive cell number. In addition, the expression of intestinal stem cell markers was reduced in organoids exposed to high glucose concentrations. Our data indicate that glucotoxicity impairs L-cell differentiation, which could be associated with decreased intestinal stem cell proliferative capacity. This study provides the identification of new targets involved in new molecular signaling mechanisms impaired by glucotoxicity that could be a useful tool for the treatment of type 2 diabetes.
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26
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Costes S, Bertrand G, Ravier MA. Mechanisms of Beta-Cell Apoptosis in Type 2 Diabetes-Prone Situations and Potential Protection by GLP-1-Based Therapies. Int J Mol Sci 2021; 22:5303. [PMID: 34069914 DOI: 10.3390/ijms22105303] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/07/2021] [Accepted: 05/13/2021] [Indexed: 12/22/2022] Open
Abstract
Type 2 diabetes (T2D) is characterized by chronic hyperglycemia secondary to the decline of functional beta-cells and is usually accompanied by a reduced sensitivity to insulin. Whereas altered beta-cell function plays a key role in T2D onset, a decreased beta-cell mass was also reported to contribute to the pathophysiology of this metabolic disease. The decreased beta-cell mass in T2D is, at least in part, attributed to beta-cell apoptosis that is triggered by diabetogenic situations such as amyloid deposits, lipotoxicity and glucotoxicity. In this review, we discussed the molecular mechanisms involved in pancreatic beta-cell apoptosis under such diabetes-prone situations. Finally, we considered the molecular signaling pathways recruited by glucagon-like peptide-1-based therapies to potentially protect beta-cells from death under diabetogenic situations.
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27
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Abstract
The prevalence of heart failure is on the rise and imposes a major health threat, in part, due to the rapidly increased prevalence of overweight and obesity. To this point, epidemiological, clinical, and experimental evidence supports the existence of a unique disease entity termed “obesity cardiomyopathy,” which develops independent of hypertension, coronary heart disease, and other heart diseases. Our contemporary review evaluates the evidence for this pathological condition, examines putative responsible mechanisms, and discusses therapeutic options for this disorder. Clinical findings have consolidated the presence of left ventricular dysfunction in obesity. Experimental investigations have uncovered pathophysiological changes in myocardial structure and function in genetically predisposed and diet-induced obesity. Indeed, contemporary evidence consolidates a wide array of cellular and molecular mechanisms underlying the etiology of obesity cardiomyopathy including adipose tissue dysfunction, systemic inflammation, metabolic disturbances (insulin resistance, abnormal glucose transport, spillover of free fatty acids, lipotoxicity, and amino acid derangement), altered intracellular especially mitochondrial Ca2+ homeostasis, oxidative stress, autophagy/mitophagy defect, myocardial fibrosis, dampened coronary flow reserve, coronary microvascular disease (microangiopathy), and endothelial impairment. Given the important role of obesity in the increased risk of heart failure, especially that with preserved systolic function and the recent rises in COVID-19-associated cardiovascular mortality, this review should provide compelling evidence for the presence of obesity cardiomyopathy, independent of various comorbid conditions, underlying mechanisms, and offer new insights into potential therapeutic approaches (pharmacological and lifestyle modification) for the clinical management of obesity cardiomyopathy.
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Affiliation(s)
- Jun Ren
- Department of Cardiology, Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital Fudan University, Shanghai, China.,Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington
| | - Ne N Wu
- Department of Cardiology, Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital Fudan University, Shanghai, China
| | - Shuyi Wang
- School of Medicine, Shanghai University, Shanghai, China.,University of Wyoming College of Health Sciences, Laramie, Wyoming
| | - James R Sowers
- Dalton Cardiovascular Research Center, Diabetes and Cardiovascular Research Center, University of Missouri-Columbia, Columbia, Missouri
| | - Yingmei Zhang
- Department of Cardiology, Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital Fudan University, Shanghai, China
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28
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Yang G, Li L, Liu Y, Liang K, Wei L, Chen L. Hyperglycemia-Induced Dysregulated Fusion Intermediates in Insulin-Secreting Cells Visualized by Super-Resolution Microscopy. Front Cell Dev Biol 2021; 9:650167. [PMID: 33937248 PMCID: PMC8083903 DOI: 10.3389/fcell.2021.650167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 03/15/2021] [Indexed: 11/23/2022] Open
Abstract
Impaired insulin release is a hallmark of type 2 diabetes and is closely related to chronically elevated glucose concentrations, known as “glucotoxicity.” However, the molecular mechanisms by which glucotoxicity impairs insulin secretion remain poorly understood. In addition to known kiss-and-run and kiss-and-stay fusion events in INS-1 cells, ultrafast Hessian structured illumination microscopy (Hessian SIM) enables full fusion to be categorized according to the newly identified structures, such as ring fusion (those with enlarged pores) or dot fusion (those without apparent pores). In addition, we identified four fusion intermediates during insulin exocytosis: initial pore opening, vesicle collapse, enlarged pore formation, and final pore dilation. Long-term incubation in supraphysiological doses of glucose reduced exocytosis in general and increased the occurrence of kiss-and-run events at the expense of reduced full fusion. In addition, hyperglycemia delayed pore opening, vesicle collapse, and enlarged pore formation in full fusion events. It also reduced the size of apparently enlarged pores, all of which contributed to the compromised insulin secretion. These phenotypes were mostly due to the hyperglycemia-induced reduction in syntaxin-1A (Stx-1A) and SNAP-25 protein, since they could be recapitulated by the knockdown of endogenous Stx-1A and SNAP-25. These findings suggest essential roles for the vesicle fusion type and intermediates in regulating insulin secretion from pancreatic beta cells in normal and disease conditions.
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Affiliation(s)
- Guoyi Yang
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, School of Future Technology, Peking University, Beijing, China
| | - Liuju Li
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, School of Future Technology, Peking University, Beijing, China
| | - Yanmei Liu
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, School of Future Technology, Peking University, Beijing, China.,Institute for Brain Research and Rehabilitation, Key Laboratory of Brain, Cognition and Education Science, South China Normal University, Guangzhou, China
| | - Kuo Liang
- Department of General Surgery, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Lisi Wei
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, School of Future Technology, Peking University, Beijing, China
| | - Liangyi Chen
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, School of Future Technology, Peking University, Beijing, China.,PKU-IDG/McGovern Institute for Brain Research, Beijing, China.,Beijing Academy of Artificial Intelligence, Beijing, China.,Shenzhen Bay Laboratory, Shenzhen, China
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29
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Diaz-Ganete A, Quiroga-de-Castro A, Mateos RM, Medina F, Segundo C, Lechuga-Sancho AM. Toxicity Induced by Cytokines, Glucose, and Lipids Increase Apoptosis and Hamper Insulin Secretion in the 1.1E7 Beta Cell-Line. Int J Mol Sci 2021; 22:ijms22052559. [PMID: 33806355 PMCID: PMC7961802 DOI: 10.3390/ijms22052559] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 03/01/2021] [Accepted: 03/02/2021] [Indexed: 12/27/2022] Open
Abstract
Basic research on types 1 and 2 diabetes mellitus require early stage studies using beta cells or cell lines, ideally of human origin and with preserved insulin secretion in response to glucose. The 1.1E7 cells are a hybrid cell line resulting from the electrofusion of dispersed human islets and PANC-1 cells, capable of secreting insulin in response to glucose, but their survival and function under toxic conditions remains untested. This characterization is the purpose of the present study. We treated these cells with a cytokine mix, high glucose, palmitate, and the latter two combined. Under these conditions, we measured cell viability and apoptosis (MTT, Caspase Glo and TUNEL assays, as well as caspase-8 and -9 levels by Western blotting), endoplasmic reticulum stress markers (EIF2AK3, HSPA4, EIF2a, and HSPA5) by real-time PCR, and insulin secretion with a glucose challenge. All of these stimuli (i) induce apoptosis and ER stress markers expression, (ii) reduce mRNA amounts of 2–5 components of genes involved in the insulin secretory pathway, and (iii) abrogate the insulin release capability of 1.1E7 cells in response to glucose. The most pronounced effects were observed with cytokines and with palmitate and high glucose combined. This characterization may well serve as the starting point for those choosing this cell line for future basic research on certain aspects of diabetes.
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Affiliation(s)
- Antonia Diaz-Ganete
- Inflammation, Nutrition, Metabolism and Oxidative Stress Study Group (INMOX), Biomedical Research and Innovation Institute of Cádiz (INiBICA), Research Unit, Puerta del Mar University Hospital, 11009 Cádiz, Spain; (A.D.-G.); (R.M.M.); (F.M.)
| | - Aranzazu Quiroga-de-Castro
- Area of Pediatrics, Department of Child and Mother Health and Radiology, Medical School, University of Cádiz, 11002 Cádiz, Spain;
| | - Rosa M. Mateos
- Inflammation, Nutrition, Metabolism and Oxidative Stress Study Group (INMOX), Biomedical Research and Innovation Institute of Cádiz (INiBICA), Research Unit, Puerta del Mar University Hospital, 11009 Cádiz, Spain; (A.D.-G.); (R.M.M.); (F.M.)
- Area of Biochemistry and Molecular Biology, Department of Biomedicine, Biotechnology and Public Health, University of Cádiz, 11519 Cádiz, Spain
| | - Francisco Medina
- Inflammation, Nutrition, Metabolism and Oxidative Stress Study Group (INMOX), Biomedical Research and Innovation Institute of Cádiz (INiBICA), Research Unit, Puerta del Mar University Hospital, 11009 Cádiz, Spain; (A.D.-G.); (R.M.M.); (F.M.)
- Salus Infirmorum Faculty of Nursing, Cadiz University, 11001 Cadiz, Spain
| | - Carmen Segundo
- Inflammation, Nutrition, Metabolism and Oxidative Stress Study Group (INMOX), Biomedical Research and Innovation Institute of Cádiz (INiBICA), Research Unit, Puerta del Mar University Hospital, 11009 Cádiz, Spain; (A.D.-G.); (R.M.M.); (F.M.)
- Salus Infirmorum Faculty of Nursing, Cadiz University, 11001 Cadiz, Spain
- Correspondence: (C.S.); (A.M.L.-S.)
| | - Alfonso M. Lechuga-Sancho
- Inflammation, Nutrition, Metabolism and Oxidative Stress Study Group (INMOX), Biomedical Research and Innovation Institute of Cádiz (INiBICA), Research Unit, Puerta del Mar University Hospital, 11009 Cádiz, Spain; (A.D.-G.); (R.M.M.); (F.M.)
- Area of Pediatrics, Department of Child and Mother Health and Radiology, Medical School, University of Cádiz, 11002 Cádiz, Spain;
- Pediatric Endocrinology, Department of Pediatrics, Puerta del Mar University Hospital, 11009 Cádiz, Spain
- Correspondence: (C.S.); (A.M.L.-S.)
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30
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Mir-Coll J, Moede T, Paschen M, Neelakandhan A, Valladolid-Acebes I, Leibiger B, Biernath A, Ämmälä C, Leibiger IB, Yesildag B, Berggren PO. Human Islet Microtissues as an In Vitro and an In Vivo Model System for Diabetes. Int J Mol Sci 2021; 22:1813. [PMID: 33670429 PMCID: PMC7918101 DOI: 10.3390/ijms22041813] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 02/08/2021] [Accepted: 02/09/2021] [Indexed: 12/16/2022] Open
Abstract
Loss of pancreatic β-cell function is a critical event in the pathophysiology of type 2 diabetes. However, studies of its underlying mechanisms as well as the discovery of novel targets and therapies have been hindered due to limitations in available experimental models. In this study we exploited the stable viability and function of standardized human islet microtissues to develop a disease-relevant, scalable, and reproducible model of β-cell dysfunction by exposing them to long-term glucotoxicity and glucolipotoxicity. Moreover, by establishing a method for highly-efficient and homogeneous viral transduction, we were able to monitor the loss of functional β-cell mass in vivo by transplanting reporter human islet microtissues into the anterior chamber of the eye of immune-deficient mice exposed to a diabetogenic diet for 12 weeks. This newly developed in vitro model as well as the described in vivo methodology represent a new set of tools that will facilitate the study of β-cell failure in type 2 diabetes and would accelerate the discovery of novel therapeutic agents.
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Affiliation(s)
- Joan Mir-Coll
- InSphero AG, Wagistrasse 27a, 8952 Schlieren, Switzerland; (J.M.-C.); (A.N.); (A.B.)
| | - Tilo Moede
- The Rolf Luft Research Center for Diabetes and Endocrinology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Karolinska Sjukhuset L1:03, 17176 Stockholm, Sweden; (T.M.); (M.P.); (I.V.-A.); (I.B.L.)
| | - Meike Paschen
- The Rolf Luft Research Center for Diabetes and Endocrinology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Karolinska Sjukhuset L1:03, 17176 Stockholm, Sweden; (T.M.); (M.P.); (I.V.-A.); (I.B.L.)
| | - Aparna Neelakandhan
- InSphero AG, Wagistrasse 27a, 8952 Schlieren, Switzerland; (J.M.-C.); (A.N.); (A.B.)
| | - Ismael Valladolid-Acebes
- The Rolf Luft Research Center for Diabetes and Endocrinology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Karolinska Sjukhuset L1:03, 17176 Stockholm, Sweden; (T.M.); (M.P.); (I.V.-A.); (I.B.L.)
| | - Barbara Leibiger
- The Rolf Luft Research Center for Diabetes and Endocrinology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Karolinska Sjukhuset L1:03, 17176 Stockholm, Sweden; (T.M.); (M.P.); (I.V.-A.); (I.B.L.)
| | - Adelinn Biernath
- InSphero AG, Wagistrasse 27a, 8952 Schlieren, Switzerland; (J.M.-C.); (A.N.); (A.B.)
| | - Carina Ämmälä
- Bioscience, Research and Early Development, Cardiovascular, Renal and Metabolism, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, 43138 Mölndal, Sweden;
| | - Ingo B. Leibiger
- The Rolf Luft Research Center for Diabetes and Endocrinology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Karolinska Sjukhuset L1:03, 17176 Stockholm, Sweden; (T.M.); (M.P.); (I.V.-A.); (I.B.L.)
| | - Burcak Yesildag
- InSphero AG, Wagistrasse 27a, 8952 Schlieren, Switzerland; (J.M.-C.); (A.N.); (A.B.)
| | - Per-Olof Berggren
- The Rolf Luft Research Center for Diabetes and Endocrinology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Karolinska Sjukhuset L1:03, 17176 Stockholm, Sweden; (T.M.); (M.P.); (I.V.-A.); (I.B.L.)
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31
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Scheen M, Giraud R, Bendjelid K. Stress hyperglycemia, cardiac glucotoxicity, and critically ill patient outcomes current clinical and pathophysiological evidence. Physiol Rep 2021; 9:e14713. [PMID: 33463901 PMCID: PMC7814494 DOI: 10.14814/phy2.14713] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 12/09/2020] [Accepted: 12/12/2020] [Indexed: 01/07/2023] Open
Abstract
Stress hyperglycemia is a transient increase in blood glucose during acute physiological stress in the absence of glucose homeostasis dysfunction. Its's presence has been described in critically ill patients who are subject to many physiological insults. In this regard, hyperglycemia and impaired glucose tolerance are also frequent in patients who are admitted to the intensive care unit for heart failure and cardiogenic shock. The hyperglycemia observed at the beginning of these cardiac disorders appears to be related to a variety of stress mechanisms. The release of major stress and steroid hormones, catecholamine overload, and glucagon all participate in generating a state of insulin resistance with increased hepatic glucose output and glycogen breakdown. In fact, the observed pathophysiological response, which appears to regulate a stress situation, is harmful because it induces mitochondrial impairment, oxidative stress-related injury to cells, endothelial damage, and dysfunction of several cellular channels. Paradigms are now being challenged by growing evidence of a phenomenon called glucotoxicity, providing an explanation for the benefits of lowering glucose levels with insulin therapy in these patients. In the present review, the authors present the data published on cardiac glucotoxicity and discuss the benefits of lowering plasma glucose to improve heart function and to positively affect the course of critical illness.
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Affiliation(s)
- Marc Scheen
- Intensive Care Division, University Hospitals, Geneva, Switzerland.,Geneva Hemodynamic Research Group, Geneva, Switzerland.,Faculty of Medicine, Geneva, Switzerland
| | - Raphael Giraud
- Intensive Care Division, University Hospitals, Geneva, Switzerland.,Geneva Hemodynamic Research Group, Geneva, Switzerland.,Faculty of Medicine, Geneva, Switzerland
| | - Karim Bendjelid
- Intensive Care Division, University Hospitals, Geneva, Switzerland.,Geneva Hemodynamic Research Group, Geneva, Switzerland.,Faculty of Medicine, Geneva, Switzerland
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Goboza M, Meyer M, Aboua YG, Oguntibeju OO. In Vitro Antidiabetic and Antioxidant Effects of Different Extracts of Catharanthus roseus and Its Indole Alkaloid, Vindoline. Molecules 2020; 25:molecules25235546. [PMID: 33256043 PMCID: PMC7729994 DOI: 10.3390/molecules25235546] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 10/19/2020] [Accepted: 10/27/2020] [Indexed: 12/11/2022] Open
Abstract
The Catharanthus roseus plant has been used traditionally to treat diabetes mellitus. Scientific evidence supporting the antidiabetic effects of this plant's active ingredient-vindoline has not been fully evaluated. In this study, extracts of C. roseus and vindoline were tested for antioxidant activities, alpha amylase and alpha glucosidase inhibitory activities and insulin secretory effects in pancreatic RIN-5F cell line cultured in the absence of glucose, at low and high glucose concentrations. The methanolic extract of the plant showed the highest antioxidant activities in addition to the high total polyphenolic content (p < 0.05). The HPLC results exhibited increased concentration of vindoline in the dichloromethane and the ethylacetate extracts. Vindoline showed noticeable antioxidant activity when compared to ascorbic acid at p < 0.05 and significantly improved the in vitro insulin secretion. The intracellular reactive oxygen species formation in glucotoxicity-induced cells was significantly reduced following treatment with vindoline, methanolic and the dichloromethane extracts when compared to the high glucose untreated control (p < 0.05). Plant extracts and vindoline showed weaker inhibitory effects on the activities of carbohydrate metabolizing enzymes when compared to acarbose, which inhibited the activities of the enzymes by 80%. The plant extracts also exhibited weak alpha amylase and alpha glucosidase inhibitory effects.
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Affiliation(s)
- Mediline Goboza
- Phytomedicine and Phytochemistry Group, Oxidative Stress Research Centre, Department of Biomedical Sciences, Faculty of Health & Wellness Sciences, Cape Peninsula University of Technology, Bellville 7535, South Africa;
| | - Mervin Meyer
- DSI/Mintek Nanotechnology Innovation Centre, Biolabels Node, Department of Biotechnology, University of the Western Cape, Bellville 7530, South Africa;
| | - Yapo G. Aboua
- Department of Health Sciences, Faculty of Health and Applied Sciences, Namibia University of Science and Technology, Windhoek 10005, Namibia;
| | - Oluwafemi O. Oguntibeju
- Phytomedicine and Phytochemistry Group, Oxidative Stress Research Centre, Department of Biomedical Sciences, Faculty of Health & Wellness Sciences, Cape Peninsula University of Technology, Bellville 7535, South Africa;
- Correspondence: ; Tel.: +27-2-1953-8495
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Jimenez-Sánchez C, Brun T, Maechler P. Mitochondrial Carriers Regulating Insulin Secretion Profiled in Human Islets upon Metabolic Stress. Biomolecules 2020; 10:E1543. [PMID: 33198243 DOI: 10.3390/biom10111543] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 10/28/2020] [Accepted: 11/10/2020] [Indexed: 12/27/2022] Open
Abstract
Chronic exposure of β-cells to nutrient-rich metabolic stress impairs mitochondrial metabolism and its coupling to insulin secretion. We exposed isolated human islets to different metabolic stresses for 3 days: 0.4 mM oleate or 0.4 mM palmitate at physiological 5.5 mM glucose (lipotoxicity), high 25 mM glucose (glucotoxicity), and high 25 mM glucose combined with 0.4 mM oleate and/or palmitate (glucolipotoxicity). Then, we profiled the mitochondrial carriers and associated genes with RNA-Seq. Diabetogenic conditions, and in particular glucotoxicity, increased expression of several mitochondrial solute carriers in human islets, such as the malate carrier DIC, the α-ketoglutarate-malate exchanger OGC, and the glutamate carrier GC1. Glucotoxicity also induced a general upregulation of the electron transport chain machinery, while palmitate largely counteracted this effect. Expression of different components of the TOM/TIM mitochondrial protein import system was increased by glucotoxicity, whereas glucolipotoxicity strongly upregulated its receptor subunit TOM70. Expression of the mitochondrial calcium uniporter MCU was essentially preserved by metabolic stresses. However, glucotoxicity altered expression of regulatory elements of calcium influx as well as the Na+/Ca2+ exchanger NCLX, which mediates calcium efflux. Overall, the expression profile of mitochondrial carriers and associated genes was modified by the different metabolic stresses exhibiting nutrient-specific signatures.
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Yao X, Li K, Liang C, Zhou Z, Wang J, Wang S, Liu L, Yu CL, Song ZB, Bao YL, Zheng LH, Sun Y, Wang G, Huang Y, Yi J, Sun L, Li Y. Tectorigenin enhances PDX1 expression and protects pancreatic β-cells by activating ERK and reducing ER stress. J Biol Chem 2020; 295:12975-12992. [PMID: 32690606 DOI: 10.1074/jbc.ra120.012849] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 07/16/2020] [Indexed: 11/06/2022] Open
Abstract
Pancreas/duodenum homeobox protein 1 (PDX1) is an important transcription factor that regulates islet β-cell proliferation, differentiation, and function. Reduced expression of PDX1 is thought to contribute to β-cell loss and dysfunction in diabetes. Thus, promoting PDX1 expression can be an effective strategy to preserve β-cell mass and function. Previously, we established a PDX1 promoter-dependent luciferase system to screen agents that can promote PDX1 expression. Natural compound tectorigenin (TG) was identified as a promising candidate that could enhance the activity of the promoter for the PDX1 gene. In this study, we first demonstrated that TG could promote the expression of PDX1 in β-cells via activating extracellular signal-related kinase (ERK), as indicated by increased phosphorylation of ERK; this effect was observed under either normal or glucotoxic/lipotoxic conditions. We then found that TG could suppress induced apoptosis and improved the viability of β-cells under glucotoxicity and lipotoxicity by activation of ERK and reduction of reactive oxygen species and endoplasmic reticulum (ER) stress. These effects held true in vivo as well: prophylactic or therapeutic use of TG could obviously inhibit ER stress and decrease islet β-cell apoptosis in the pancreas of mice given a high-fat/high-sucrose diet (HFHSD), thus dramatically maintaining or restoring β-cell mass and islet size, respectively. Accordingly, both prophylactic and therapeutic use of TG improved HFHSD-impaired glucose metabolism in mice, as evidenced by ameliorating hyperglycemia and glucose intolerance. Taken together, TG, as an agent promoting PDX1 expression exhibits strong protective effects on islet β-cells both in vitro and in vivo.
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Affiliation(s)
- Xinlei Yao
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China; Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Kun Li
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Chen Liang
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Zilong Zhou
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Jiao Wang
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Shuyue Wang
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Lei Liu
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Chun-Lei Yu
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Zhen-Bo Song
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Yong-Li Bao
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Li-Hua Zheng
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Ying Sun
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Guannan Wang
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Yanxin Huang
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Jingwen Yi
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Luguo Sun
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China.
| | - Yuxin Li
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China.
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Lee YH, Jung HS, Kwon MJ, Jang JE, Kim TN, Lee SH, Kim MK, Park JH. Melatonin protects INS-1 pancreatic β-cells from apoptosis and senescence induced by glucotoxicity and glucolipotoxicity. Islets 2020; 12:87-98. [PMID: 32673151 PMCID: PMC7527021 DOI: 10.1080/19382014.2020.1783162] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
INTRODUCTION Melatonin is a hormone known as having very strong anti-oxidant property. Senescence is a biological state characterized by the loss of cell replication and the changes consisting of a pro-inflammatory phenotype, leading to Senescence Associated Secretory Phenotype (SASP) which is now regarded as one of the fundamental processes of many degenerative diseases. Increased cell division count induces cell senescence via DNA damage in response to elevated Reactive Oxygen Species (ROS). We wanted to test whether melatonin could reduce apoptosis and stress induced premature pancreatic β-cell senescence induced by glucotoxicity and glucolipotoxicity. MATERIALS AND METHOD Cultured rodent pancreatic β-cell line (INS-1 cell) was used. Glucotoxicity (HG: hyperglycemia) and glucolipotoxicity (HGP: hyperglycemia with palmitate) were induced by hyperglycemia and the addition of palmitate. The degrees of the senescence were measured by SA-β-Gal and P16lnk4A staining along with the changes of cell viabilities, cell cycle-related protein and gene expressions, endogenous anti-oxidant defense enzymes, and Glucose Stimulated Insulin Secretion (GSIS), before and after melatonin treatment. RESULTS Cultured INS-1 cells in HG and HGP conditions revealed accelerated senescence, increased apoptosis, cell cycle arrest, compromised endogenous anti-oxidant defense, and impaired glucose-stimulated insulin secretion. Melatonin decreased apoptosis and expressions of proteins related to senescence, increase the endogenous anti-oxidant defense, and improved glucose-stimulated insulin secretion. CONCLUSION Melatonin protected pancreatic β-cell from apoptosis, decreased expressions of the markers related to the accelerated senescence, and improved the biological deteriorations induced by glucotoxicity and glucolipotoxicity.
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Affiliation(s)
- Yu Hee Lee
- Department of Internal Medicine, College of Medicine, Inje University, Busan, Republic of Korea
| | - Hye Sook Jung
- Paik Institute for Clinical Research, Inje University, Busan, Republic of Korea
| | - Min Jeong Kwon
- Department of Internal Medicine, College of Medicine, Inje University, Busan, Republic of Korea
| | - Jung Eun Jang
- Department of Internal Medicine, College of Medicine, Inje University, Busan, Republic of Korea
| | - Tae Nyun Kim
- Department of Internal Medicine, College of Medicine, Inje University, Busan, Republic of Korea
| | - Soon Hee Lee
- Department of Internal Medicine, College of Medicine, Inje University, Busan, Republic of Korea
| | - Mi-Kyung Kim
- Department of Internal Medicine, College of Medicine, Inje University, Busan, Republic of Korea
- Paik Institute for Clinical Research, Inje University, Busan, Republic of Korea
| | - Jeong Hyun Park
- Department of Internal Medicine, College of Medicine, Inje University, Busan, Republic of Korea
- Paik Institute for Clinical Research, Inje University, Busan, Republic of Korea
- CONTACT Jeong Hyun Park Department of Internal Medicine, Busan Paik Hospital, College of Medicine, Inje University, Busan47392, Republic of Korea
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Ferri G, Tesi M, Massarelli F, Marselli L, Marchetti P, Cardarelli F. Metabolic response of Insulinoma 1E cells to glucose stimulation studied by fluorescence lifetime imaging. FASEB Bioadv 2020; 2:409-418. [PMID: 32676581 PMCID: PMC7354695 DOI: 10.1096/fba.2020-00014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 04/01/2020] [Accepted: 05/21/2020] [Indexed: 01/02/2023] Open
Abstract
A cascade of highly regulated biochemical processes connects glucose stimulation to insulin secretion in specialized cells of mammalian pancreas, the β-cells. Given the importance of this process for systemic glucose homeostasis, noninvasive and fast strategies capable to monitor the response to glucose in living cells are highly desirable. Here, we use the phasor-based approach to Fluorescence Lifetime IMaging (FLIM) microscopy to quantify the ratio between protein-bound and free Nicotinamide adenine dinucleotide (phosphate) species in their reduced form (NAD(P)H), and the Insulinoma cell line INS-1E as a β-like cellular model. Phasor-FLIM analysis shows that the bound/free ratio of NAD(P)H species increases upon pulsed glucose stimulation. Such response is impaired by 48-hours preincubation of cells under hyperglycemic conditions. Phasor-FLIM concomitantly monitors the appearance of long-lifetime species (LLS) as characteristic products of hyperglycemia-induced oxidative stress.
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Affiliation(s)
| | - Marta Tesi
- Department of Clinical and Experimental MedicineIslet Cell LaboratoryUniversity of PisaPisaItaly
| | | | - Lorella Marselli
- Department of Clinical and Experimental MedicineIslet Cell LaboratoryUniversity of PisaPisaItaly
| | - Piero Marchetti
- Department of Clinical and Experimental MedicineIslet Cell LaboratoryUniversity of PisaPisaItaly
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Abstract
Heart disease is widely recognized as a major cause of death worldwide and is the leading cause of mortality in the United States. Centuries of research have focused on defining mechanistic alterations that drive cardiac pathogenesis, yet sudden cardiac death (SCD) remains a common unpredictable event that claims lives in every age group. The heart supplies blood to all tissues while maintaining a constant electrical and hormonal feedback communication with other parts of the body. As such, recent research has focused on understanding how myocardial electrical and structural properties are altered by cardiac metabolism and the various signaling pathways associated with it. The importance of cardiac metabolism in maintaining myocardial function, or lack thereof, is exemplified by shifts in cardiac substrate preference during normal development and various pathological conditions. For instance, a shift from fatty acid (FA) oxidation to oxygen-sparing glycolytic energy production has been reported in many types of cardiac pathologies. Compounded by an uncoupling of glycolysis and glucose oxidation this leads to accumulation of undesirable levels of intermediate metabolites. The resulting accumulation of intermediary metabolites impacts cardiac mitochondrial function and dysregulates metabolic pathways through several mechanisms, which will be reviewed here. Importantly, reversal of metabolic maladaptation has been shown to elicit positive therapeutic effects, limiting cardiac remodeling and at least partially restoring contractile efficiency. Therein, the underlying metabolic adaptations in an array of pathological conditions as well as recently discovered downstream effects of various substrate utilization provide guidance for future therapeutic targeting. Here, we will review recent data on alterations in substrate utilization in the healthy and diseased heart, metabolic pathways governing cardiac pathogenesis, mitochondrial function in the diseased myocardium, and potential metabolism-based therapeutic interventions in disease.
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Affiliation(s)
- J Snyder
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, United States
| | - R Zhai
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, United States
| | - A I Lackey
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, United States
| | - P Y Sato
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, United States
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Brun T, Jiménez-Sánchez C, Madsen JGS, Hadadi N, Duhamel D, Bartley C, Oberhauser L, Trajkovski M, Mandrup S, Maechler P. AMPK Profiling in Rodent and Human Pancreatic Beta-Cells under Nutrient-Rich Metabolic Stress. Int J Mol Sci 2020; 21:ijms21113982. [PMID: 32492936 PMCID: PMC7312098 DOI: 10.3390/ijms21113982] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/28/2020] [Accepted: 05/29/2020] [Indexed: 12/13/2022] Open
Abstract
Chronic exposure of pancreatic β-cells to elevated nutrient levels impairs their function and potentially induces apoptosis. Like in other cell types, AMPK is activated in β-cells under conditions of nutrient deprivation, while little is known on AMPK responses to metabolic stresses. Here, we first reviewed recent studies on the role of AMPK activation in β-cells. Then, we investigated the expression profile of AMPK pathways in β-cells following metabolic stresses. INS-1E β-cells and human islets were exposed for 3 days to glucose (5.5–25 mM), palmitate or oleate (0.4 mM), and fructose (5.5 mM). Following these treatments, we analyzed transcript levels of INS-1E β-cells by qRT-PCR and of human islets by RNA-Seq; with a special focus on AMPK-associated genes, such as the AMPK catalytic subunits α1 (Prkaa1) and α2 (Prkaa2). AMPKα and pAMPKα were also evaluated at the protein level by immunoblotting. Chronic exposure to the different metabolic stresses, known to alter glucose-stimulated insulin secretion, did not change AMPK expression, either in insulinoma cells or in human islets. Expression profile of the six AMPK subunits was marginally modified by the different diabetogenic conditions. However, the expression of some upstream kinases and downstream AMPK targets, including K-ATP channel subunits, exhibited stress-specific signatures. Interestingly, at the protein level, chronic fructose treatment favored fasting-like phenotype in human islets, as witnessed by AMPK activation. Collectively, previously published and present data indicate that, in the β-cell, AMPK activation might be implicated in the pre-diabetic state, potentially as a protective mechanism.
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Affiliation(s)
- Thierry Brun
- Department of Cell Physiology and Metabolism & Faculty Diabetes Center, University of Geneva Medical Center, 1206 Geneva, Switzerland; (T.B.); (C.J.-S.); (N.H.); (D.D.); (C.B.); (L.O.); (M.T.)
| | - Cecilia Jiménez-Sánchez
- Department of Cell Physiology and Metabolism & Faculty Diabetes Center, University of Geneva Medical Center, 1206 Geneva, Switzerland; (T.B.); (C.J.-S.); (N.H.); (D.D.); (C.B.); (L.O.); (M.T.)
| | - Jesper Grud Skat Madsen
- Functional Genomics and Metabolism Research Unit, Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark; (J.G.S.M.); (S.M.)
| | - Noushin Hadadi
- Department of Cell Physiology and Metabolism & Faculty Diabetes Center, University of Geneva Medical Center, 1206 Geneva, Switzerland; (T.B.); (C.J.-S.); (N.H.); (D.D.); (C.B.); (L.O.); (M.T.)
| | - Dominique Duhamel
- Department of Cell Physiology and Metabolism & Faculty Diabetes Center, University of Geneva Medical Center, 1206 Geneva, Switzerland; (T.B.); (C.J.-S.); (N.H.); (D.D.); (C.B.); (L.O.); (M.T.)
| | - Clarissa Bartley
- Department of Cell Physiology and Metabolism & Faculty Diabetes Center, University of Geneva Medical Center, 1206 Geneva, Switzerland; (T.B.); (C.J.-S.); (N.H.); (D.D.); (C.B.); (L.O.); (M.T.)
| | - Lucie Oberhauser
- Department of Cell Physiology and Metabolism & Faculty Diabetes Center, University of Geneva Medical Center, 1206 Geneva, Switzerland; (T.B.); (C.J.-S.); (N.H.); (D.D.); (C.B.); (L.O.); (M.T.)
| | - Mirko Trajkovski
- Department of Cell Physiology and Metabolism & Faculty Diabetes Center, University of Geneva Medical Center, 1206 Geneva, Switzerland; (T.B.); (C.J.-S.); (N.H.); (D.D.); (C.B.); (L.O.); (M.T.)
| | - Susanne Mandrup
- Functional Genomics and Metabolism Research Unit, Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark; (J.G.S.M.); (S.M.)
| | - Pierre Maechler
- Department of Cell Physiology and Metabolism & Faculty Diabetes Center, University of Geneva Medical Center, 1206 Geneva, Switzerland; (T.B.); (C.J.-S.); (N.H.); (D.D.); (C.B.); (L.O.); (M.T.)
- Correspondence:
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Yung JHM, Giacca A. Role of c-Jun N-terminal Kinase (JNK) in Obesity and Type 2 Diabetes. Cells 2020; 9:E706. [PMID: 32183037 DOI: 10.3390/cells9030706] [Citation(s) in RCA: 89] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 02/16/2020] [Accepted: 03/11/2020] [Indexed: 12/13/2022] Open
Abstract
Obesity has been described as a global epidemic and is a low-grade chronic inflammatory disease that arises as a consequence of energy imbalance. Obesity increases the risk of type 2 diabetes (T2D), by mechanisms that are not entirely clarified. Elevated circulating pro-inflammatory cytokines and free fatty acids (FFA) during obesity cause insulin resistance and ß-cell dysfunction, the two main features of T2D, which are both aggravated with the progressive development of hyperglycemia. The inflammatory kinase c-jun N-terminal kinase (JNK) responds to various cellular stress signals activated by cytokines, free fatty acids and hyperglycemia, and is a key mediator in the transition between obesity and T2D. Specifically, JNK mediates both insulin resistance and ß-cell dysfunction, and is therefore a potential target for T2D therapy.
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Moens C, Bensellam M, Himpe E, Muller CJF, Jonas JC, Bouwens L. Aspalathin Protects Insulin-Producing β Cells against Glucotoxicity and Oxidative Stress-Induced Cell Death. Mol Nutr Food Res 2020; 64:e1901009. [PMID: 32012427 DOI: 10.1002/mnfr.201901009] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 12/23/2019] [Indexed: 12/17/2022]
Abstract
SCOPE Aspalathin, the main polyphenolic phytochemical of rooibos (Aspalathus linearis), has been attributed with health promoting properties, including a glucose lowering effect that can prove interesting for application as nutraceutical or therapeutic in (pre-)diabetics. Preservation of β cell mass in the pancreas is considered a key issue for diabetes prevention or treatment, therefore the aim is to investigate whether aspalathin also has β cell cytoprotective potential. METHODS AND RESULTS Rat pancreatic islets and the β cell line Insulinoma 1E (INS1E) are studied in vitro after exposure to various cytotoxic agents, namely streptozotocin (STZ), hydrogen peroxide, or chronic high glucose. The effect of aspalathin on cell survival and apoptosis is studied. Expression of relevant cytoprotective genes is analyzed by qRT-PCR and proteins by Western blot. Aspalathin is found to protect β cells against cytotoxicity and apoptosis. This is associated with increased translocation of nuclear factor erythroid 2-related factor 2 (NRF2) and expression of its antioxidant target genes heme oxygenase 1 (Hmox1), NAD(P)H quinone dehydrogenase 1 (Nqo-1), and superoxide dismutase 1 (Sod1). CONCLUSION It is proposed that aspalathin protects β cells against glucotoxicity and oxidative stress by increasing the expression of NRF2-regulated antioxidant enzymes. This indicates that aspalathin is an interesting β cell cytoprotectant.
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Affiliation(s)
- Céline Moens
- Cell Differentiation Lab, Vrije Universiteit Brussel, Laarbeeklaan 103, 1090 Jette, Brussels, Belgium
| | - Mohammed Bensellam
- Université Catholique de Louvain, Institut de Recherche Expérimentale et Clinique, Pôle d'Endocrinologie, Diabète et Nutrition, Avenue Hippocrate 55, 1200 Brussels, Brussels, Belgium
| | - Eddy Himpe
- Cell Differentiation Lab, Vrije Universiteit Brussel, Laarbeeklaan 103, 1090 Jette, Brussels, Belgium
| | - Christo J F Muller
- Biomedical Research and Innovation Platform, South African Medical Research Council, Francie van Zijl Drive, 7505, Western Cape, Tygerberg, South Africa
| | - Jean-Christophe Jonas
- Université Catholique de Louvain, Institut de Recherche Expérimentale et Clinique, Pôle d'Endocrinologie, Diabète et Nutrition, Avenue Hippocrate 55, 1200 Brussels, Brussels, Belgium
| | - Luc Bouwens
- Cell Differentiation Lab, Vrije Universiteit Brussel, Laarbeeklaan 103, 1090 Jette, Brussels, Belgium
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Yang Z, Wu S, Zhao J, Wang Z, Yao M, Lu P, Dong W, Sun J. Emulsified isoflurane protects beta cells against high glucose-induced apoptosis via inhibiting endoplasmic reticulum stress. Ann Palliat Med 2020; 9:90-97. [PMID: 32005067 DOI: 10.21037/apm.2019.11.31] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 11/29/2019] [Indexed: 11/06/2022]
Abstract
BACKGROUND Pancreatic beta cell damage induced by glucose toxicity is an important factor in type 2 diabetes mellitus (T2DM). It has become evident that endoplasmic reticulum stress (ERS)-induced apoptosis was contributed to beta cell dysfunction and insulin resistance. Our previous work showed that emulsified isoflurane (EIso) could alleviate ERS in lung reperfusion injury. This study aimed to elucidate whether EIso could alleviate apoptosis induced by glucose in rat islet RIN-m5F beta cells via inhibiting ERS. METHODS RIN-m5F cells were divided into five groups: the control group; the 0.1G group, cultured in 0.1M glucose for 24 h; the 0.3G group, cultured in 0.3M glucose for 24 h; the 0.3G + 57E group, cultured in 0.3M glucose with 57 µM EIso for 24 h, and the 0.3G + 76E group, cultured in 0.3M glucose with 76 µM EIso for 24 h. First, cell proliferation was measured by MTT assay, and the level of insulin secretion was measured with enzyme-linked immunosorbent assay (ELISA) kit. Second, the expression of B cell leukemia/lymphoma 2 (Bcl-2) associated X (Bax) and Bcl-2 were detected by Western blotting. The level of caspase-3 activity was assessed by colorimetric method. Finally, the ERS marker CHOP and GRP78 expression were detected by Western blotting. The levels of activating transcription factor-6 (ATF6), X-box-binding protein 1 (Xbp1), and eukaryotic translation initiation factor-2α (eIF2α) mRNA were assessed by quantitative real-time polymerase chain reaction (qRT-PCR) after being treated with EIso for 24 h. RESULTS We found that exposure to high glucose reduced RIN-m5F cell viability, stimulated the secretion of insulin, activated caspase-3, improved the expression of Bax, and down-regulated Bcl-2. EIso improved the survival and protected the function of RIN-m5F. Compared to the 0.3G group, treatment with EIso inhibited the activity of caspase-3, and decreased the expression of Bax. The expression of CHOP and GRP78 were significantly suppressed by EIso at 24 h in a dose-dependent manner. The level of ATF6, Xbp1, and eIF2α mRNA of RIN-m5F were enhanced by high glucose, but only eIF2α mRNA was significantly decreased by EIso treatment. CONCLUSIONS The present study suggests that high glucose induces rat islet beta cell RIN-m5F apoptosis and aggravates the function of beta cells. EIso protects beta cells against high glucose through the ERS-dependent apoptotic pathway and might serve as a potential therapy for diabetes.
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Affiliation(s)
- Zhenkun Yang
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China
| | - Shuoxiong Wu
- Department of Anesthesiology, Wuxi Children's Hospital, Wuxi 214023, China
| | - Jingjing Zhao
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China
| | - Zuoyu Wang
- Department of Medical Oncology, Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China
| | - Min Yao
- Department of Anesthesiology, Wuxi Children's Hospital, Wuxi 214023, China
| | - Peihua Lu
- Department of Medical Oncology, Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China
| | - Wenyan Dong
- Department of Anesthesiology, Wuxi Children's Hospital, Wuxi 214023, China.
| | - Jie Sun
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China.
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Mansur RB, Lee Y, Subramaniapillai M, Cha DS, Brietzke E, McIntyre RS. Parsing metabolic heterogeneity in mood disorders: A hypothesis-driven cluster analysis of glucose and insulin abnormalities. Bipolar Disord 2020; 22:79-88. [PMID: 31464359 DOI: 10.1111/bdi.12826] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
OBJECTIVES Metabolically based distinctions for disturbances in glucose and insulin may provide meaningful insights both clinically and mechanistically. METHODS Data were derived from 352 subjects of previously completed clinical studies with a mood disorder (MD) (bipolar disorder: n = 179, major depressive disorder: n = 173) and 218 healthy controls from the Comprehensive Assessment of Long-Term Effects of Reducing Intake of Energy. We conducted a factor analysis to replicate a priori dissociable factors informed by glucose and insulin levels and indices of insulin resistance and beta-cell function: elevated insulin and insulin resistance ("insulin-IR"), and increased fasting glucose and reduced insulin secretion ("glucotoxicity"). Cluster analyses were conducted, separately in men and women, to evaluate the clinical relevance of subtyping individuals with MDs using insulin-IR and glucotoxicity (GT) factor scores. RESULTS Factors insulin-IR and GT explained 92.64% and 92.09% of the variance in men and women respectively. Three clusters were replicated in men and women separately: metabolically healthy (MH), high GT, and insulin-resistant (IR). After adjusting for age, gender, study cohort, MD diagnosis, and antipsychotics use, body mass index (BMI) and mean arterial pressure were higher in IR- vs GT- or MH-clustered individuals; GT-clustered individuals had more metabolic syndrome components and higher C-reactive protein. Glucotoxic-clustered subjects reported greater impairments in cognitive function and global functioning when compared to MH- or IR-clustered subjects. CONCLUSIONS Using simple, cost-effective, and accessible measures, we identified stable, gender-convergent, subgroups of individuals that significantly diverged on measures of cognitive dysfunction, self-reported anhedonia, functional disability, BMI, and blood pressure.
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Affiliation(s)
- Rodrigo B Mansur
- Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, Canada.,Department of Psychiatry, University of Toronto, Toronto, Canada
| | - Yena Lee
- Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, Canada.,Department of Psychiatry, University of Toronto, Toronto, Canada
| | | | - Danielle S Cha
- Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, Canada
| | - Elisa Brietzke
- Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, Canada.,Department of Psychiatry, Queen's University, Kingston, Canada.,Department of Psychiatry, Research Group in Molecular and Behavioral Neurosciences of Mood Disorders, Universidade Federal de São Paulo, Sao Paulo, Brazil
| | - Roger S McIntyre
- Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, Canada.,Department of Psychiatry, University of Toronto, Toronto, Canada.,Brain and Cognition Discovery Foundation, Toronto, Canada
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43
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Sergi D, Renaud J, Simola N, Martinoli MG. Diabetes, a Contemporary Risk for Parkinson's Disease: Epidemiological and Cellular Evidences. Front Aging Neurosci 2019; 11:302. [PMID: 31787891 PMCID: PMC6856011 DOI: 10.3389/fnagi.2019.00302] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 10/22/2019] [Indexed: 12/14/2022] Open
Abstract
Diabetes mellitus (DM), a group of diseases characterized by defective glucose metabolism, is the most widespread metabolic disorder affecting over 400 million adults worldwide. This pathological condition has been implicated in the pathogenesis of a number of central encephalopathies and peripheral neuropathies. In further support of this notion, recent epidemiological evidence suggests a link between DM and Parkinson’s disease (PD), with hyperglycemia emerging as one of the culprits in neurodegeneration involving the nigrostriatal pathway, the neuroanatomical substrate of the motor symptoms affecting parkinsonian patients. Indeed, dopaminergic neurons located in the mesencephalic substantia nigra appear to be particularly vulnerable to oxidative stress and degeneration, likely because of their intrinsic susceptibility to mitochondrial dysfunction, which may represent a direct consequence of hyperglycemia and hyperglycemia-induced oxidative stress. Other pathological pathways induced by increased intracellular glucose levels, including the polyol and the hexosamine pathway as well as the formation of advanced glycation end-products, may all play a pivotal role in mediating the detrimental effects of hyperglycemia on nigral dopaminergic neurons. In this review article, we will examine the epidemiological as well as the molecular and cellular clues supporting the potential susceptibility of nigrostriatal dopaminergic neurons to hyperglycemia.
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Affiliation(s)
- Domenico Sergi
- Nutrition and Health Substantiation Group, Nutrition and Health Program, Health and Biosecurity, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Adelaide, SA, Australia.,Adelaide Medical School, University of Adelaide, Adelaide, SA, Australia
| | - Justine Renaud
- Cellular Neurobiology, Department of Medical Biology, Université du Québec, Trois-Rivières, QC, Canada
| | - Nicola Simola
- Department of Biomedical Sciences, University of Cagliari, Cagliari, Italy.,National Institute for Neuroscience (INN), University of Cagliari, Cagliari, Italy
| | - Maria-Grazia Martinoli
- Cellular Neurobiology, Department of Medical Biology, Université du Québec, Trois-Rivières, QC, Canada.,Department of Psychiatry and Neuroscience, Université Laval and CHU Research Center, Québec, QC, Canada
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Liu L, Liang C, Mei P, Zhu H, Hou M, Yu C, Song Z, Bao Y, Huang Y, Yi J, Wang S, Wu Y, Zheng L, Sun Y, Wang G, Huo M, Yang S, Sun L, Li Y. Dracorhodin perchlorate protects pancreatic β-cells against glucotoxicity- or lipotoxicity-induced dysfunction and apoptosis in vitro and in vivo. FEBS J 2019; 286:3718-3736. [PMID: 31349381 DOI: 10.1111/febs.15020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 05/18/2019] [Accepted: 07/24/2019] [Indexed: 12/11/2022]
Abstract
Glucotoxicity or lipotoxicity leads to hyperglycemia and insulin secretion deficiency, which are important causes for the onset of type 2 diabetes mellitus (T2DM). Thus, the restoration of β-cell function is a long-sought goal in diabetes research. Previous studies have implicated pancreatic and duodenal homeobox 1 gene (Pdx1) in β-cell function and insulin secretion. In this study, we established a Pdx1 promoter-dependent luciferase system and identified the natural compound dracorhodin perchlorate (DP) as an effective promotor of Pdx1 expression. We further demonstrated that DP could significantly inhibit β-cell apoptosis induced by 33 mm glucose or 200 μm palmitate by interfering with endoplasmic reticulum stress and mitochondrial pathways and enhance insulin secretion as well. These effects were associated with enhanced activities of Erk1/2, which in turn promoted Pdx1 expression and increased the ratio of Bcl2/Bax, since inhibition of the Erk1/2 pathway abolished the DP-induced expression of Pdx1 and suppression of apoptosis. In addition, our in vivo results in diabetic mice indicated that DP treatment lowered blood glucose, raised insulin levels, enhanced Pdx1 expression and increased islet size and number in the pancreas of diabetic mice. Our findings suggest that Pdx1 is a potential target molecule of DP in the treatment of T2DM via the inhibition of glucotoxicity- or lipotoxicity- induced β-cell apoptosis and the attenuation of insulin secretion dysfunction.
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Affiliation(s)
- Lei Liu
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Chen Liang
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Pucheng Mei
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Hong Zhu
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Meiling Hou
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Chunlei Yu
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Zhenbo Song
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Yongli Bao
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Yanxin Huang
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Jingwen Yi
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Shuyue Wang
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Yin Wu
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Lihua Zheng
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Ying Sun
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
| | - Guannan Wang
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Mingxin Huo
- School of Environment, Northeast Normal University, Changchun, China
| | - Shaonian Yang
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China.,The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Stockholm, Sweden
| | - Luguo Sun
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China
| | - Yuxin Li
- Research Center of Agriculture and Medicine gene Engineering of Ministry of Education, Northeast Normal University, Changchun, China
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Park JE, Seo Y, Han JS. HM-Chromanone Isolated from Portulaca oleracea L. Protects INS-1 Pancreatic β Cells against Glucotoxicity-Induced Apoptosis. Nutrients 2019; 11:nu11020404. [PMID: 30769910 PMCID: PMC6412778 DOI: 10.3390/nu11020404] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 01/31/2019] [Accepted: 02/11/2019] [Indexed: 01/09/2023] Open
Abstract
In this study, we investigated whether (E)-5-hydroxy-7-methoxy-3-(2′-hydroxybenzyl)-4-chromanone, a homoisoflavonoid compound isolated from Portulaca oleracea L., protects INS-1 pancreatic β cells against glucotoxicity-induced apoptosis. Treatment with high glucose (30 mM) induced apoptosis in INS-1 pancreatic β cells; however, the level of cell viability was significantly increased by treatment with (E)-5-hydroxy-7-methoxy-3-(2′-hydroxybenzyl)-4-chromanone. Treatment with 10–20 µM of (E)-5-hydroxy-7-methoxy-3-(2′-hydroxybenzyl)-4-chromanone dose-dependently increased cell viability and significantly decreased the intracellular level of reactive oxygen species (ROS), thiobarbituric acid reactive substances (TBARS), and nitric oxide levels in INS-1 pancreatic β cells pretreated with high glucose. These effects were associated with increased anti-apoptotic Bcl-2 protein expression, while reducing pro-apoptotic Bax, cytochrome C, and caspase 9 protein expression. Treatment with (E)-5-hydroxy-7-methoxy-3-(2′-hydroxybenzyl)-4-chromanone reduced the apoptosis previously induced by high-level glucose-treatment, according to annexin V/propidium iodide staining. These results demonstrate that (E)-5-hydroxy-7-methoxy-3-(2′-hydroxybenzyl)-4-chromanone may be useful as a potential therapeutic agent to protect INS-1 pancreatic β cells against high glucose-induced apoptosis.
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Affiliation(s)
- Jae Eun Park
- Department of Food Science and Nutrition, Pusan National University, Busan 46241, Korea.
| | - Youngwan Seo
- Division of Marine Bioscience, Korea Maritime and Ocean University, Busan 49112, Korea.
| | - Ji Sook Han
- Department of Food Science and Nutrition, Pusan National University, Busan 46241, Korea.
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Abstract
The liver is an organ with many facets, including a role in energy production and metabolic balance, detoxification and extraordinary capacity of regeneration. Hepatic glucose production plays a crucial role in the maintenance of normal glucose levels in the organism i.e. between 0.7 to 1.1 g/l. The loss of this function leads to a rare genetic metabolic disease named glycogen storage disease type I (GSDI), characterized by severe hypoglycemia during short fasts. On the contrary, type 2 diabetes is characterized by chronic hyperglycemia, partly due to an overproduction of glucose by the liver. Indeed, diabetes is characterized by increased uptake/production of glucose by hepatocytes, leading to the activation of de novo lipogenesis and the development of a non-alcoholic fatty liver disease. In GSDI, the accumulation of glucose-6 phosphate, which cannot be hydrolyzed into glucose, leads to an increase of glycogen stores and the development of hepatic steatosis. Thus, in these pathologies, hepatocytes are subjected to cellular stress mainly induced by glucotoxicity and lipotoxicity. In this review, we have compared hepatic cellular stress induced in type 2 diabetes and GSDI, especially oxidative stress, autophagy deregulation, and ER-stress. In addition, both GSDI and diabetic patients are prone to the development of hepatocellular adenomas (HCA) that occur on a fatty liver in the absence of cirrhosis. These HCA can further acquire malignant traits and transform into hepatocellular carcinoma. This process of tumorigenesis highlights the importance of an optimal metabolic control in both GSDI and diabetic patients in order to prevent, or at least to restrain, tumorigenic activity during disturbed glucose metabolism pathologies.
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Affiliation(s)
- Monika Gjorgjieva
- Institut National de la Santé et de la Recherche Médicale, U1213, Lyon, F-69008, France.,Université de Lyon, Lyon, F-69008 France.,Université Lyon I, Villeurbanne, F-69622 France
| | - Gilles Mithieux
- Institut National de la Santé et de la Recherche Médicale, U1213, Lyon, F-69008, France.,Université de Lyon, Lyon, F-69008 France.,Université Lyon I, Villeurbanne, F-69622 France
| | - Fabienne Rajas
- Institut National de la Santé et de la Recherche Médicale, U1213, Lyon, F-69008, France.,Université de Lyon, Lyon, F-69008 France.,Université Lyon I, Villeurbanne, F-69622 France
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Abstract
Inhibiting Class IIa Histone Deacetylase (HDAC) function is a promising approach to therapeutically enhance skeletal and cardiac muscle metabolic health in several chronic diseases including type 2 diabetes. However, the importance of Class IIa HDACs in the beta-cell remains unknown. As beta-cell function is vital to maintaining glycaemia it is essential that the importance of Class IIa HDACs in the beta-cell is determined. Here we used the INS-1E cell line cultured in normal glucose (11.1 mM) or hyperglycaemic (20 mM) conditions for 48 hrs to represent cells in a normal and diabetic environment respectively. Cells cultured in high glucose showed significantly reduced insulin secretory function and increased apoptotic signalling compared to cells cultured in normal glucose. Class IIa HDACS, HDAC-4 and -5, were not regulated at the transcript or protein level under normal or hyperglycaemic conditions suggesting that they may not play a role in beta-cell dysfunction. Furthermore, overexpression of wild-type HDAC-4 and -5 or dominant negative HDAC-4 and -5 did not alter insulin secretion, insulin mRNA expression or apoptotic signalling under normal or hyperglycaemic conditions. This suggests that Class IIa Histone Deacetylases do not play an important physiological role in the beta-cell under normal or diabetic conditions. Thus, Class IIa Histone Deacetylase inhibitors are not likely to have a detrimental effect on beta-cells supporting the use of these inhibitors to treat metabolic diseases such as type 2 diabetes.
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Affiliation(s)
- Jacob McCann
- Metabolic Research Unit, School of Medicine, Deakin University, Waurn Ponds, Australia
| | - Megan Ellis
- Metabolic Research Unit, School of Medicine, Deakin University, Waurn Ponds, Australia
| | - Sean L. McGee
- Metabolic Research Unit, School of Medicine, Deakin University, Waurn Ponds, Australia
| | - Kathryn Aston-Mourney
- Metabolic Research Unit, School of Medicine, Deakin University, Waurn Ponds, Australia
- CONTACT Kathryn Aston-Mourney Deakin University, Building Nb, 75 Pigdons Rd, Waurn Ponds, VIC 3216, Australia
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48
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Koufakis T, Karras SN, Zebekakis P, Ajjan R, Kotsa K. Should the last be first? Questions and dilemmas regarding early short-term insulin treatment in Type 2 Diabetes Mellitus. Expert Opin Biol Ther 2018; 18:1113-1121. [PMID: 30244600 DOI: 10.1080/14712598.2018.1526278] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 01/11/2023]
Abstract
INTRODUCTION Early short-term insulin treatment (STIT), defined as insulin administration shortly after diabetes diagnosis for only a brief period of time, is an alternative concept, aiming to entirely revise the perspective of type 2 diabetes (T2DM) management. AREAS COVERED The present review intends to summarize what is already known regarding early STIT in T2DM and highlight questions and dilemmas from the clinician's point of view, with a discourse on future research agenda. EXPERT OPINION STIT has the potential to modify the natural history of T2DM, resulting in improved drug-free remission rates by favorably affecting the underlying pathophysiology of the disease. Existing data in the field manifest significant weaknesses, mainly being the small number of trials and patients included, the lack of control groups in most studies and the wide heterogeneity between study designs and explored outcomes, which limit definitive conclusions. Therefore, before such a therapeutic strategy is incorporated into daily practice, important issues require further clarification by future trials. These issues include the optimal time point for the intervention, the ideal insulin type, the identification of patients being most likely to benefit, the STIT effects on cardiovascular and other clinical outcomes and the cost-effectiveness evaluation of this therapeutic strategy. ABBREVIATIONS T2DM: Type 2 Diabetes Mellitus; HbA1C: Hemoglobin A1c; OHA: Oral Hypoglycemic Agents; STIT: Short-term Insulin Treatment; CSII: Continuous Subcutaneous Insulin Infusion; MDI: Multiple Daily Injections; PPG: Postprandial Plasma Glucose; FPG: Fasting Plasma Glucose; HOMA-b: Homeostasis Model Assessment of beta-cell function; TDD: Total Daily Insulin Dose; DI: Disposition Index; HOMA-IR: Homeostasis Model Assessment of Insulin Resistance; ROS: Reactive Oxygen Species; TNF: Tumor Necrosis Factor; GLP-1: Glucagon-like peptide-1; GIP: Glucose-dependent Insulinotropic Polypeptide; BMI: Body Mass Index; CV: Cardiovascular; DR: Diabetic Retinopathy; SU: Sulfonylurea; IGI: Insulinogenic Index.
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Affiliation(s)
- Theocharis Koufakis
- a Division of Endocrinology and Metabolism and Diabetes Center, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki , AHEPA University Hospital , Thessaloniki , Greece
| | - Spyridon N Karras
- a Division of Endocrinology and Metabolism and Diabetes Center, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki , AHEPA University Hospital , Thessaloniki , Greece
| | - Pantelis Zebekakis
- a Division of Endocrinology and Metabolism and Diabetes Center, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki , AHEPA University Hospital , Thessaloniki , Greece
| | - Ramzi Ajjan
- b Division of Cardiovascular and Diabetes Research, Leeds Institute for Cardiovascular and Metabolic Medicine , University of Leeds , Leeds , UK
| | - Kalliopi Kotsa
- a Division of Endocrinology and Metabolism and Diabetes Center, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki , AHEPA University Hospital , Thessaloniki , Greece
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Dziubak A, Wójcicka G, Wojtak A, Bełtowski J. Metabolic Effects of Metformin in the Failing Heart. Int J Mol Sci 2018; 19:ijms19102869. [PMID: 30248910 PMCID: PMC6213955 DOI: 10.3390/ijms19102869] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 09/11/2018] [Accepted: 09/17/2018] [Indexed: 01/03/2023] Open
Abstract
Accumulating evidence shows that metformin is an insulin-sensitizing antidiabetic drug widely used in the treatment of type 2 diabetes mellitus (T2DM), which can exert favorable effects on cardiovascular risk and may be safely used in patients with heart failure (HF), and even able to reduce the incidence of HF and to reduce HF mortality. In failing hearts, metformin improves myocardial energy metabolic status through the activation of AMP (adenosine monophosphate)-activated protein kinase (AMPK) and the regulation of lipid and glucose metabolism. By increasing nitric oxide (NO) bioavailability, limiting interstitial fibrosis, reducing the deposition of advanced glycation end-products (AGEs), and inhibiting myocardial cell apoptosis metformin reduces cardiac remodeling and hypertrophy, and thereby preserves left ventricular systolic and diastolic functions. While a lot of preclinical and clinical studies showed the cardiovascular safety of metformin therapy in diabetic patients and HF, to confirm observed benefits, the specific large-scale trials configured for HF development in diabetic patients as a primary endpoints are necessary.
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Affiliation(s)
- Aleksandra Dziubak
- Department of Pathophysiology, Medical University of Lublin, ul. Jaczewskiego 8b, 20-090 Lublin, Poland.
| | - Grażyna Wójcicka
- Department of Pathophysiology, Medical University of Lublin, ul. Jaczewskiego 8b, 20-090 Lublin, Poland.
| | - Andrzej Wojtak
- Department of Vascular Surgery, Medical University of Lubin, 20-090 Lublin, Poland.
| | - Jerzy Bełtowski
- Department of Pathophysiology, Medical University of Lublin, ul. Jaczewskiego 8b, 20-090 Lublin, Poland.
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50
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Ghemrawi R, Battaglia-Hsu SF, Arnold C. Endoplasmic Reticulum Stress in Metabolic Disorders. Cells 2018; 7:E63. [PMID: 29921793 DOI: 10.3390/cells7060063] [Citation(s) in RCA: 118] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 06/12/2018] [Accepted: 06/14/2018] [Indexed: 02/06/2023] Open
Abstract
Metabolic disorders have become among the most serious threats to human health, leading to severe chronic diseases such as obesity, type 2 diabetes, and non-alcoholic fatty liver disease, as well as cardiovascular diseases. Interestingly, despite the fact that each of these diseases has different physiological and clinical symptoms, they appear to share certain pathological traits such as intracellular stress and inflammation induced by metabolic disturbance stemmed from over nutrition frequently aggravated by a modern, sedentary life style. These modern ways of living inundate cells and organs with saturating levels of sugar and fat, leading to glycotoxicity and lipotoxicity that induce intracellular stress signaling ranging from oxidative to ER stress response to cope with the metabolic insults (Mukherjee, et al., 2015). In this review, we discuss the roles played by cellular stress and its responses in shaping metabolic disorders. We have summarized here current mechanistic insights explaining the pathogenesis of these disorders. These are followed by a discussion of the latest therapies targeting the stress response pathways.
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