1
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Muley A, Fernandez R, Green H, Muley P. Effect of thiamine supplementation on glycaemic outcomes in adults with type 2 diabetes: a systematic review and meta-analysis. BMJ Open 2022; 12:e059834. [PMID: 36008064 PMCID: PMC9422810 DOI: 10.1136/bmjopen-2021-059834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND Patients with type 2 diabetes mellitus (T2DM) have been shown to have thiamine deficiency. Dietary supplementation is an economic strategy to control blood glucose. Objective: To evaluate effectiveness of thiamine supplementation on glycaemic outcomes in patients with T2DM. METHODS Eligibility criteria: Studies that assessed effect of thiamine supplementation in adults with T2DM which measured glycaemic outcomes-HbA1c, fasting blood glucose (FBG) and/or postprandial blood glucose (PPG) were included. Information sources: PUBMED, Tripdatabase, the Cochrane Central Register, National Institute of Health Clinical Database and Google Scholar were searched until December 2021 for RCTs. Risk of bias: It was assessed using standardised critical appraisal instruments from the Joanna Briggs Institute for RCTs. Synthesis of results: Where possible, studies were pooled in a meta-analysis. Results were presented in a narrative format if statistical pooling was not possible. RESULTS Included studies: Six trials involving 364 participants. Synthesis of results: No significant beneficial effects were observed on glycaemic outcomes with 100-900 mg/day of thiamine or benfotiamine for up to 3 months (HbA1c: MD, -0.02%, 95% CI: -0.35 to 0.31; FBG: MD,-0.20 mmol/L; 95% CI: -0.69 to 0.29; PPG: MD, - 0.20 mmol/L, 95% CI: -2.05 to 1.65 (mean difference, MD)). There was a significant increase in high-density lipoprotein (HDL) (MD, 0.10; 95% CI: 0.10 to 0.20) at 3-month follow-up. Benfotiamine reduced triglyceride level (MD, -1.10; 95% CI: -1.90 to -0.30) in 120 mg/day dose as compared with placebo 150 mg/day, however this was not demonstrated in higher doses. DISCUSSION Limitations of evidence: Inclusion of single-centre trials published only in English, small sample sizes of included studies, lack of trials investigating outcomes for same comparisons and varying follow-up periods. Interpretation: Thiamine supplementation does not affect glycaemic outcomes, however reduces triglycerides while increasing HDL. Multicentre well-designed RCT with higher doses of thiamine and a follow-up period of 1-2 years will provide better evidence. PROSPERO REGISTRATION NUMBER CRD42020170520.
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Affiliation(s)
- Arti Muley
- Medicine, PIMSR, Parul University, Vadodara, Gujarat, India
| | - Ritin Fernandez
- Nursing, University of Wollongong Faculty of Science Medicine and Health, Wollongong, New South Wales, Australia
| | - Heidi Green
- Nursing, Centre for Research in Nursing and Health, St George Hospital, Sydney, New South Wales, Australia
| | - Prasad Muley
- Pediatrics, PIMSR, Parul University, Vadodara, Gujarat, India
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2
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Metabolic Shades of S-D-Lactoylglutathione. Antioxidants (Basel) 2022; 11:antiox11051005. [PMID: 35624868 PMCID: PMC9138017 DOI: 10.3390/antiox11051005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 05/16/2022] [Accepted: 05/17/2022] [Indexed: 02/04/2023] Open
Abstract
S-D-lactoylglutathione (SDL) is an intermediate of the glutathione-dependent metabolism of methylglyoxal (MGO) by glyoxalases. MGO is an electrophilic compound that is inevitably produced in conjunction with glucose breakdown and is essentially metabolized via the glyoxalase route. In the last decades, MGO metabolism and its cytotoxic effects have been under active investigation, while almost nothing is known about SDL. This article seeks to fill the gap by presenting an overview of the chemistry, biochemistry, physiological role and clinical importance of SDL. The effects of intracellular SDL are investigated in three main directions: as a substrate for post-translational protein modifications, as a reservoir for mitochondrial reduced glutathione and as an energy currency. In essence, all three approaches point to one direction, namely, a metabolism-related regulatory role, enhancing the cellular defense against insults. It is also suggested that an increased plasma concentration of SDL or its metabolites may possibly serve as marker molecules in hemolytic states, particularly when the cause of hemolysis is a disturbance of the pay-off phase of the glycolytic chain. Finally, SDL could also represent a useful marker in such metabolic disorders as diabetes mellitus or ketotic states, in which its formation is expected to be enhanced. Despite the lack of clear-cut evidence underlying the clinical and experimental findings, the investigation of SDL metabolism is a promising field of research.
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3
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Gancheva S, Kahl S, Pesta D, Mastrototaro L, Dewidar B, Strassburger K, Sabah E, Esposito I, Weiß J, Sarabhai T, Wolkersdorfer M, Fleming T, Nawroth P, Zimmermann M, Reichert AS, Schlensak M, Roden M. Impaired Hepatic Mitochondrial Capacity in Nonalcoholic Steatohepatitis Associated With Type 2 Diabetes. Diabetes Care 2022; 45:928-937. [PMID: 35113139 DOI: 10.2337/dc21-1758] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 01/13/2022] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Individuals with type 2 diabetes are at higher risk of progression of nonalcoholic fatty liver (steatosis) to steatohepatitis (NASH), fibrosis, and cirrhosis. The hepatic metabolism of obese individuals adapts by upregulation of mitochondrial capacity, which may be lost during the progression of steatosis. However, the role of type 2 diabetes with regard to hepatic mitochondrial function in NASH remains unclear. RESEARCH DESIGN AND METHODS We therefore examined obese individuals with histologically proven NASH without (OBE) (n = 30; BMI 52 ± 9 kg/m2) or with type 2 diabetes (T2D) (n = 15; 51 ± 7 kg/m2) as well as healthy individuals without liver disease (CON) (n = 14; 25 ± 2 kg/m2). Insulin sensitivity was measured by hyperinsulinemic-euglycemic clamps with d-[6,6-2H2]glucose. Liver biopsies were used for assessing mitochondrial capacity by high-resolution respirometry and protein expression. RESULTS T2D and OBE had comparable hepatic fat content, lobular inflammation, and fibrosis. Oxidative capacity in liver tissue normalized for citrate synthase activity was 59% greater in OBE than in CON, whereas T2D presented with 33% lower complex II-linked oxidative capacity than OBE and higher H2O2 production than CON. Interestingly, those with NASH and hepatic fibrosis score ≥1 had lower oxidative capacity and antioxidant defense than those without fibrosis. CONCLUSIONS Loss of hepatic mitochondrial adaptation characterizes NASH and type 2 diabetes or hepatic fibrosis and may thereby favor accelerated disease progression.
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Affiliation(s)
- Sofiya Gancheva
- Department of Endocrinology and Diabetology, Medical Faculty and University Hospital, Heinrich Heine University, Düsseldorf, Germany.,Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, München-Neuherberg, Germany
| | - Sabine Kahl
- Department of Endocrinology and Diabetology, Medical Faculty and University Hospital, Heinrich Heine University, Düsseldorf, Germany.,Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, München-Neuherberg, Germany
| | - Dominik Pesta
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, München-Neuherberg, Germany
| | - Lucia Mastrototaro
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, München-Neuherberg, Germany
| | - Bedair Dewidar
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, München-Neuherberg, Germany.,Department of Pharmacology and Toxicology, Faculty of Pharmacy, Tanta University, Tanta, Egypt
| | - Klaus Strassburger
- German Center for Diabetes Research, Partner Düsseldorf, München-Neuherberg, Germany.,Institute for Biometrics and Epidemiology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany
| | - Ehsan Sabah
- Obesity and Reflux Center, Neuwerk Hospital, Mönchengladbach, Germany
| | - Irene Esposito
- Institute of Pathology, Heinrich Heine University, Düsseldorf, Germany
| | - Jürgen Weiß
- German Center for Diabetes Research, Partner Düsseldorf, München-Neuherberg, Germany.,Institute for Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany
| | - Theresia Sarabhai
- Department of Endocrinology and Diabetology, Medical Faculty and University Hospital, Heinrich Heine University, Düsseldorf, Germany.,Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, München-Neuherberg, Germany
| | | | - Thomas Fleming
- Department of Internal Medicine I, University Hospital Heidelberg, Heidelberg, Germany
| | - Peter Nawroth
- Department of Internal Medicine I, University Hospital Heidelberg, Heidelberg, Germany
| | - Marcel Zimmermann
- Institute of Biochemistry and Molecular Biology I, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University, Düsseldorf, Germany
| | - Andreas S Reichert
- Institute of Biochemistry and Molecular Biology I, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University, Düsseldorf, Germany
| | | | - Michael Roden
- Department of Endocrinology and Diabetology, Medical Faculty and University Hospital, Heinrich Heine University, Düsseldorf, Germany.,Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, München-Neuherberg, Germany
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4
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Gallant J, Heunis T, Beltran C, Schildermans K, Bruijns S, Mertens I, Bitter W, Sampson SL. PPE38-Secretion-Dependent Proteins of M. tuberculosis Alter NF-kB Signalling and Inflammatory Responses in Macrophages. Front Immunol 2021; 12:702359. [PMID: 34276695 PMCID: PMC8284050 DOI: 10.3389/fimmu.2021.702359] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 06/07/2021] [Indexed: 11/17/2022] Open
Abstract
It was previously shown that secretion of PE-PGRS and PPE-MPTR proteins is abolished in clinical M. tuberculosis isolates with a deletion in the ppe38-71 operon, which is associated with increased virulence. Here we investigate the proteins dependent on PPE38 for their secretion and their role in the innate immune response using temporal proteomics and protein turnover analysis in a macrophage infection model. A decreased pro-inflammatory response was observed in macrophages infected with PPE38-deficient M. tuberculosis CDC1551 as compared to wild type bacteria. We could show that dampening of the pro-inflammatory response is associated with activation of a RelB/p50 pathway, while the canonical inflammatory pathway is active during infection with wild type M. tuberculosis CDC1551. These results indicate a molecular mechanism by which M. tuberculosis PE/PPE proteins controlled by PPE38 have an effect on modulating macrophage responses through NF-kB signalling.
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Affiliation(s)
- James Gallant
- Department of Science and Technology/National Research Foundation Centre of Excellence in Biomedical Tuberculosis Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
- Section Molecular Microbiology, Amsterdam Institute for Molecules, Medicines and Systems, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Tiaan Heunis
- Department of Science and Technology/National Research Foundation Centre of Excellence in Biomedical Tuberculosis Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Caroline Beltran
- Department of Science and Technology/National Research Foundation Centre of Excellence in Biomedical Tuberculosis Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | | | - Sven Bruijns
- Department of Molecular Cell Biology and Immunology, Cancer Center Amsterdam, Amsterdam Infection and Immunity Institute, Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, Netherlands
| | | | - Wilbert Bitter
- Section Molecular Microbiology, Amsterdam Institute for Molecules, Medicines and Systems, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
- Medical Microbiology and Infection Control, Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, Netherlands
| | - Samantha L. Sampson
- Department of Science and Technology/National Research Foundation Centre of Excellence in Biomedical Tuberculosis Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
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5
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Sugawa H, Yachi A, Fujimoto Y, Nagai R. Accumulation of Nε-(carboxyethyl) lysine in Caenorhabditis elegans is correlated with the formation of ketone body. J Biochem 2021; 170:587-592. [PMID: 34213548 DOI: 10.1093/jb/mvab079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 06/28/2021] [Indexed: 11/12/2022] Open
Abstract
Advanced glycation end-products (AGEs) are formed when proteins react with carbonyl compounds, and they gradually accumulate with age. However, AGE accumulation with aging is not fully understood because longevity studies in mammals are time-consuming. Therefore, we used Caenorhabditis elegans to evaluate the correlation between aging and AGE accumulation. Age-synchronized C. elegans nematodes were cultured for 3 and 12 days. The levels of Nε-(carboxymethyl) lysine, Nω-(carboxymethyl) arginine, Nδ-(5-hydro-5-methyl-4-imidazolone-2-yl) ornithine, and Nε-(carboxyethyl) lysine (CEL) were compared. Glucose, methylglyoxal, and acetol were incubated with human serum albumin, and CEL formation was evaluated. The levels of methylglyoxal and ketone bodies in C. elegans were quantified. CEL accumulation increased significantly with culture duration. Methylglyoxal and ketone bodies-possible forerunners of AGE accumulation-were also quantified with respect to culture duration. The levels of ketone bodies increased significantly during culture, and correlated closely with CEL accumulation (R2 = 0.72, p = 0.0008), whereas the levels of methylglyoxal did not increase over time. CEL was formed in vitro in a time-dependent manner from methylglyoxal and acetol when incubated with human serum albumin at the same temperature as C. elegans culture, suggesting that increased levels of CEL in C. elegans are attributable to ketone bodies.
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Affiliation(s)
| | | | | | - Ryoji Nagai
- Department of Bioscience, School of Agriculture, Tokai University, Kumamoto, 862-8652, Japan
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6
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Bondar A, Popa AR, Papanas N, Popoviciu M, Vesa CM, Sabau M, Daina C, Stoica RA, Katsiki N, Stoian AP. Diabetic neuropathy: A narrative review of risk factors, classification, screening and current pathogenic treatment options (Review). Exp Ther Med 2021; 22:690. [PMID: 33986855 PMCID: PMC8111877 DOI: 10.3892/etm.2021.10122] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 02/22/2021] [Indexed: 12/15/2022] Open
Abstract
Diabetic neuropathy (DN) is a frequent complication of diabetes mellitus (DM) with severe consequences as it progresses and influences all human body systems. This review discusses the risk factors for DN, the main characteristics of the clinical forms of DN, the screening methods and the current therapeutic options. Distal symmetric DN is the primary clinical form, and DM patients should be screened for this complication. The most important treatment of DN remains good glucose control, generally defined as HbA1c ≤7%. Symptomatic treatment improves life quality in diabetic patients. Pharmacological agents such as alpha (α)-lipoic acid and benfotiamine have been validated in several studies since they act on specific pathways such as increased oxidative stress (α-lipoic acid exerts antioxidant effects) and the excessive production of advanced glycosylation products (benfotiamine may inhibit their production via the normalization of glucose). Timely diagnosis of DN is significant to avoid several complications, including lower limb amputations and cardiac arrhythmias.
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Affiliation(s)
- Andrei Bondar
- Department of Psychiatry, Clinical County Emergency Hospital of Oradea, 410169 Oradea, Romania.,Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania
| | - Amorin Remus Popa
- Department of Psychiatry, Clinical County Emergency Hospital of Oradea, 410169 Oradea, Romania.,Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania
| | - Nikolaos Papanas
- Second Department of Internal Medicine, 'Democritus' University of Thrace Diabetes Centre, 68100 Alexandroupolis, Greece
| | - Mihaela Popoviciu
- Department of Psychiatry, Clinical County Emergency Hospital of Oradea, 410169 Oradea, Romania.,Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania
| | - Cosmin Mihai Vesa
- Department of Psychiatry, Clinical County Emergency Hospital of Oradea, 410169 Oradea, Romania.,Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania
| | - Monica Sabau
- Department of Psychiatry, Clinical County Emergency Hospital of Oradea, 410169 Oradea, Romania.,Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania
| | - Cristian Daina
- Department of Psychiatry, Clinical County Emergency Hospital of Oradea, 410169 Oradea, Romania.,Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania
| | - Roxana Adriana Stoica
- Department of Diabetes, Nutrition and Metabolic Diseases, 'Carol Davila' University of Medicine and Pharmacy, 050474 Bucharest, Romania
| | - Niki Katsiki
- Second Propaedeutic Department of Internal Medicine, AHEPA University Hospital, 54636 Thessaloniki, Greece
| | - Anca Pantea Stoian
- Department of Diabetes, Nutrition and Metabolic Diseases, 'Carol Davila' University of Medicine and Pharmacy, 050474 Bucharest, Romania
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7
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Kosmachevskaya OV, Novikova NN, Topunov AF. Carbonyl Stress in Red Blood Cells and Hemoglobin. Antioxidants (Basel) 2021; 10:253. [PMID: 33562243 PMCID: PMC7914924 DOI: 10.3390/antiox10020253] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 02/02/2021] [Accepted: 02/03/2021] [Indexed: 12/13/2022] Open
Abstract
The paper overviews the peculiarities of carbonyl stress in nucleus-free mammal red blood cells (RBCs). Some functional features of RBCs make them exceptionally susceptible to reactive carbonyl compounds (RCC) from both blood plasma and the intracellular environment. In the first case, these compounds arise from the increased concentrations of glucose or ketone bodies in blood plasma, and in the second-from a misbalance in the glycolysis regulation. RBCs are normally exposed to RCC-methylglyoxal (MG), triglycerides-in blood plasma of diabetes patients. MG modifies lipoproteins and membrane proteins of RBCs and endothelial cells both on its own and with reactive oxygen species (ROS). Together, these phenomena may lead to arterial hypertension, atherosclerosis, hemolytic anemia, vascular occlusion, local ischemia, and hypercoagulation phenotype formation. ROS, reactive nitrogen species (RNS), and RCC might also damage hemoglobin (Hb), the most common protein in the RBC cytoplasm. It was Hb with which non-enzymatic glycation was first shown in living systems under physiological conditions. Glycated HbA1c is used as a very reliable and useful diagnostic marker. Studying the impacts of MG, ROS, and RNS on the physiological state of RBCs and Hb is of undisputed importance for basic and applied science.
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Affiliation(s)
- Olga V. Kosmachevskaya
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia;
| | | | - Alexey F. Topunov
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia;
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8
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Restivo I, Attanzio A, Tesoriere L, Allegra M. Suicidal Erythrocyte Death in Metabolic Syndrome. Antioxidants (Basel) 2021; 10:antiox10020154. [PMID: 33494379 PMCID: PMC7911029 DOI: 10.3390/antiox10020154] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/15/2021] [Accepted: 01/18/2021] [Indexed: 02/07/2023] Open
Abstract
Eryptosis is a coordinated, programmed cell death culminating with the disposal of cells without disruption of the cell membrane and the release of endocellular oxidative and pro-inflammatory milieu. While providing a convenient form of death for erythrocytes, dysregulated eryptosis may result in a series of detrimental and harmful pathological consequences highly related to the endothelial dysfunction (ED). Metabolic syndrome (MetS) is described as a cluster of cardiometabolic factors (hyperglycemia, dyslipidemia, hypertension and obesity) that increases the risk of cardiovascular complications such as those related to diabetes and atherosclerosis. In the light of the crucial role exerted by the eryptotic process in the ED, the focus of the present review is to report and discuss the involvement of eryptosis within MetS, where vascular complications are utterly relevant. Current knowledge on the mechanisms leading to eryptosis in MetS-related conditions (hyperglycemia, dyslipidemia, hypertension and obesity) will be analyzed. Moreover, clinical evidence supporting or proposing a role for eryptosis in the ED, associated to MetS cardiovascular complications, will be discussed.
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Affiliation(s)
| | | | - Luisa Tesoriere
- Correspondence: (L.T.); (M.A.); Tel.: +39-091-238-96803 (L.T. & M.A.)
| | - Mario Allegra
- Correspondence: (L.T.); (M.A.); Tel.: +39-091-238-96803 (L.T. & M.A.)
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9
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Frolova N, Soboleva A, Nguyen VD, Kim A, Ihling C, Eisenschmidt-Bönn D, Mamontova T, Herfurth UM, Wessjohann LA, Sinz A, Birkemeyer C, Frolov A. Probing glycation potential of dietary sugars in human blood by an integrated in vitro approach. Food Chem 2020; 347:128951. [PMID: 33493836 DOI: 10.1016/j.foodchem.2020.128951] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 12/11/2020] [Accepted: 12/22/2020] [Indexed: 01/12/2023]
Abstract
Glycation is referred to as the interaction of protein amino and guanidino groups with reducing sugars and carbonyl products of their degradation. Resulting advanced glycation end-products (AGEs) contribute to pathogenesis of diabetes mellitus and neurodegenerative disorders. Upon their intestinal absorption, dietary sugars and α-dicarbonyl compounds interact with blood proteins yielding AGEs. Although the differences in glycation potential of monosaccharides are well characterized, the underlying mechanisms are poorly understood. To address this question, d-glucose, d-fructose and l-ascorbic acid were incubated with human serum albumin (HSA). The sugars and α-dicarbonyl intermediates of their degradation were analyzed in parallel to protein glycation patterns (exemplified with hydroimidazolone modifications of arginine residues and products of their hydrolysis) by bottom-up proteomics and computational chemistry. Glycation of HSA with sugars revealed 9 glyoxal- and 14 methylglyoxal-derived modification sites. Their dynamics was sugar-specific and depended on concentrations of α-dicarbonyls, their formation kinetics, and presence of stabilizing residues in close proximity to the glycation sites.
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Affiliation(s)
- Nadezhda Frolova
- Institute of Analytical Chemistry, Faculty of Chemistry and Mineralogy, University of Leipzig, Germany
| | - Alena Soboleva
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Germany; Department of Biochemistry, St. Petersburg State University, Russia.
| | - Viet Duc Nguyen
- Institute of Analytical Chemistry, Faculty of Chemistry and Mineralogy, University of Leipzig, Germany; Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Germany
| | - Ahyoung Kim
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Germany
| | - Christian Ihling
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Martin-Luther Universität Halle-Wittenberg, Germany
| | | | - Tatiana Mamontova
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Germany; Department of Biochemistry, St. Petersburg State University, Russia
| | - Uta M Herfurth
- Department of Food Safety, German Federal Institute for Risk Assessment, Germany
| | - Ludger A Wessjohann
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Germany
| | - Andrea Sinz
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Martin-Luther Universität Halle-Wittenberg, Germany
| | - Claudia Birkemeyer
- Institute of Analytical Chemistry, Faculty of Chemistry and Mineralogy, University of Leipzig, Germany
| | - Andrej Frolov
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Germany; Department of Biochemistry, St. Petersburg State University, Russia.
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10
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Alouffi S, Khan MWA. Dicarbonyls Generation, Toxicities, Detoxifications and Potential Roles in Diabetes Complications. Curr Protein Pept Sci 2020; 21:890-898. [DOI: 10.2174/1389203720666191010155145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 06/01/2019] [Accepted: 09/05/2019] [Indexed: 01/11/2023]
Abstract
It has been well established that advanced glycation end-products (AGEs) have a strong
correlation with diabetes and its secondary complications. Moreover, dicarbonyls, especially, methylglyoxal
(MG) and glyoxal, accelerate AGEs formation and hence, have potential roles in the pathogenesis
of diabetes. They can also induce oxidative stress and concomitantly decrease the efficiency of
antioxidant enzymes. Increased proinflammatory cytokines (tumor necrosis factor-α and interleukin-
1β) are secreted by monocytes due to the dicarbonyl-modified proteins. High levels of blood dicarbonyls
have been identified in diabetes and its associated complications (retinopathy, nephropathy and
neuropathy). This review aims to provide a better understanding by including in-depth information
about the formation of MG and glyoxal through multiple pathways with a focus on their biological
functions and detoxifications. The potential role of these dicarbonyls in secondary diabetic complications
is also discussed.
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Affiliation(s)
- Sultan Alouffi
- Molecular Diagnostic and Personalised Therapeutics Unit, University of Hail, Hail, Saudi Arabia
| | - Mohd Wajid Ali Khan
- Molecular Diagnostic and Personalised Therapeutics Unit, University of Hail, Hail, Saudi Arabia
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11
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Yamaguchi H, Nagai M, Sugawa H, Yasuda H, Nagai R. Development of a conventional immunochemical detection system for determination of N δ-(5-hydro-5-methyl-4-imidazolone-2-yl)-ornithine in methylglyoxal-modified proteins. Glycoconj J 2020; 38:293-301. [PMID: 33241449 DOI: 10.1007/s10719-020-09957-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 09/28/2020] [Accepted: 10/15/2020] [Indexed: 10/22/2022]
Abstract
Methylglyoxal (MGO) produced during glycolysis is known to react with arginine residues on proteins to generate advanced glycation end products, such as Nδ-(5-hydro-5-methyl-4-imidazolone-2-yl)-ornithine (MG-H1). Since the production of MGO is increased during hyperglycemia or metabolic disorders in vivo, it is considered that the measurement of MG-H1 is useful for evaluating abnormalities in carbohydrate metabolism. Thus, we prepared a monoclonal antibody against MG-H1 to develop a conventional measurement system for MG-H1. Reactivity and specificity of the antibody to MGO-modified protein were confirmed by enzyme-linked immunosorbent assay and western blotting, respectively. The measurement of MG-H1 content by the antibody was positively correlated with that by electrospray ionization-liquid chromatography-tandem mass spectrometry and the ratio of modified arginine residues by amino acid analysis. Our results demonstrated that immunochemical methods could be useful for the estimation of MG-H1 content in modified proteins.
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Affiliation(s)
- Hiroko Yamaguchi
- Laboratory of Food and Regulation Biology, Graduate School of Bioscience, Tokai University, Kumamoto, Japan
| | - Mime Nagai
- Laboratory of Food and Regulation Biology, Graduate School of Agriculture, Tokai University, Kumamoto, Japan
| | - Hikari Sugawa
- Laboratory of Food and Regulation Biology, Graduate School of Agriculture, Tokai University, Kumamoto, Japan
| | - Hisataka Yasuda
- Nagahama Institute for Biochemical Science Oriental Yeast Co., Ltd, Shiga, Japan
| | - Ryoji Nagai
- Laboratory of Food and Regulation Biology, Graduate School of Bioscience, Tokai University, Kumamoto, Japan. .,Laboratory of Food and Regulation Biology, Graduate School of Agriculture, Tokai University, Kumamoto, Japan.
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Strom A, Strassburger K, Schmuck M, Shevalye H, Davidson E, Zivehe F, Bönhof G, Reimer R, Belgardt BF, Fleming T, Biermann B, Burkart V, Müssig K, Szendroedi J, Yorek MA, Fritsche E, Nawroth PP, Roden M, Ziegler D. Interaction between magnesium and methylglyoxal in diabetic polyneuropathy and neuronal models. Mol Metab 2020; 43:101114. [PMID: 33166742 PMCID: PMC7704399 DOI: 10.1016/j.molmet.2020.101114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 11/04/2020] [Accepted: 11/05/2020] [Indexed: 12/28/2022] Open
Abstract
Objective The lack of effective treatments against diabetic sensorimotor polyneuropathy demands the search for new strategies to combat or prevent the condition. Because reduced magnesium and increased methylglyoxal levels have been implicated in the development of both type 2 diabetes and neuropathic pain, we aimed to assess the putative interplay of both molecules with diabetic sensorimotor polyneuropathy. Methods In a cross-sectional study, serum magnesium and plasma methylglyoxal levels were measured in recently diagnosed type 2 diabetes patients with (n = 51) and without (n = 184) diabetic sensorimotor polyneuropathy from the German Diabetes Study baseline cohort. Peripheral nerve function was assessed using nerve conduction velocity and quantitative sensory testing. Human neuroblastoma cells (SH-SY5Y) and mouse dorsal root ganglia cells were used to characterize the neurotoxic effect of methylglyoxal and/or neuroprotective effect of magnesium. Results Here, we demonstrate that serum magnesium concentration was reduced in recently diagnosed type 2 diabetes patients with diabetic sensorimotor polyneuropathy and inversely associated with plasma methylglyoxal concentration. Magnesium, methylglyoxal, and, importantly, their interaction were strongly interrelated with methylglyoxal-dependent nerve dysfunction and were predictive of changes in nerve function. Magnesium supplementation prevented methylglyoxal neurotoxicity in differentiated SH-SY5Y neuron-like cells due to reduction of intracellular methylglyoxal formation, while supplementation with the divalent cations zinc and manganese had no effect on methylglyoxal neurotoxicity. Furthermore, the downregulation of mitochondrial activity in mouse dorsal root ganglia cells and consequently the enrichment of triosephosphates, the primary source of methylglyoxal, resulted in neurite degeneration, which was completely prevented through magnesium supplementation. Conclusions These multifaceted findings reveal a novel putative pathophysiological pathway of hypomagnesemia-induced carbonyl stress leading to neuronal damage and merit further investigations not only for diabetic sensorimotor polyneuropathy but also other neurodegenerative diseases associated with magnesium deficiency and impaired energy metabolism. Magnesium and methylglyoxal levels were inversely associated in individuals with type 2 diabetes and distal sensorimotor polyneuropathy. Magnesium, methylglyoxal, and their interaction were associated with methylglyoxal-dependent nerve dysfunction. Under experimental conditions, magnesium supplementation prevented methylglyoxal-mediated neurotoxicity. Magnesium downregulates intracellular methylglyoxal production.
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Affiliation(s)
- Alexander Strom
- Institute for Clinical Diabetology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany; German Center for Diabetes Research (DZD), München-Neuherberg, Germany.
| | - Klaus Strassburger
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany; Institute for Biometrics and Epidemiology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany
| | - Martin Schmuck
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Hanna Shevalye
- Department of Internal Medicine, University of Iowa, Iowa City, USA
| | - Eric Davidson
- Department of Internal Medicine, University of Iowa, Iowa City, USA
| | - Fariba Zivehe
- Institute for Clinical Diabetology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany
| | - Gidon Bönhof
- Institute for Clinical Diabetology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany
| | - Rudolph Reimer
- Microscopy and Image Analysis Technology Platform, Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany
| | - Bengt-Frederik Belgardt
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany; Institute for Vascular and Islet Cell Biology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany
| | - Thomas Fleming
- Department of Medicine I and Clinical Chemistry, University Hospital Heidelberg, Heidelberg, Germany
| | - Barbara Biermann
- Institute of Neural and Sensory Physiology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany
| | - Volker Burkart
- Institute for Clinical Diabetology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany; German Center for Diabetes Research (DZD), München-Neuherberg, Germany
| | - Karsten Müssig
- Institute for Clinical Diabetology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany; German Center for Diabetes Research (DZD), München-Neuherberg, Germany; Division of Endocrinology and Diabetology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Julia Szendroedi
- Institute for Clinical Diabetology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany; German Center for Diabetes Research (DZD), München-Neuherberg, Germany; Division of Endocrinology and Diabetology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Mark A Yorek
- Department of Internal Medicine, University of Iowa, Iowa City, USA; Iowa City VA Healthcare System, Iowa City, USA
| | - Ellen Fritsche
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Peter P Nawroth
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany; Department of Medicine I and Clinical Chemistry, University Hospital Heidelberg, Heidelberg, Germany
| | - Michael Roden
- Institute for Clinical Diabetology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany; German Center for Diabetes Research (DZD), München-Neuherberg, Germany; Division of Endocrinology and Diabetology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Dan Ziegler
- Institute for Clinical Diabetology, German Diabetes Center at Heinrich Heine University, Leibniz Center for Diabetes Research, Düsseldorf, Germany; German Center for Diabetes Research (DZD), München-Neuherberg, Germany; Division of Endocrinology and Diabetology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany.
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Blood thiamine pyrophosphate concentration and its correlation with the stage of diabetic retinopathy. Int Ophthalmol 2020; 40:3279-3284. [PMID: 32715366 DOI: 10.1007/s10792-020-01513-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 07/17/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE To assess the possible relationship between blood thiamine pyrophosphate (TPP) concentration and stage of diabetic retinopathy (DR). METHODS This comparative cross-sectional study included 80 patients with type 2 diabetes mellitus (T2DM) and 20 age- and gender-matched healthy controls. Diabetic patients were subclassified into four groups each consisting of 20 subjects: no DR, mild-moderate non-proliferative DR (mild-moderate NPDR), severe NPDR, and proliferative DR (PDR). Blood TPP concentration was assessed with high-performance liquid chromatography (HPLC) assay and was correlated with the stage of DR. RESULTS Mean blood TPP concentration was 80.2 ± 14.8 nmol/L in control group. It was, respectively, 69.85 ± 18.1, 64.95 ± 13.4, 61.9 ± 13.4 and 60.75 ± 14.3 nmol/L in no DR, mild-moderate NPDR, severe NPDR and PDR groups. For mild-moderate NPDR, severe NPDR and PDR groups, TPP concentrations were significantly lower compared with controls (p: 0.014, 0.002, 0.001, respectively). Mean TPP concentration for NPDR patients was higher than for PDR patients, but the difference was not significant (p: 0.478). ANOVA revealed a significant difference between TPP concentrations of groups (p: 0.001). Mean TPP concentration decreased with the stage of DR, and number of patients with thiamine deficiency increased gradually with the stage of DR. A negative correlation was found between the TPP level and occurrence of DR (p: 0.000). CONCLUSION The results suggest that lower blood TPP concentrations were associated with higher risk of DR. Thiamine might play an important role in the pathophysiology and progression of DR. Thiamine and its derivatives might represent an approach to the prevention and/or treatment of early DR.
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High-dose thiamine supplementation may reduce resting energy expenditure in individuals with hyperglycemia: a randomized, double - blind cross-over trial. J Diabetes Metab Disord 2020; 19:297-304. [PMID: 32550179 DOI: 10.1007/s40200-020-00508-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 02/06/2020] [Indexed: 12/18/2022]
Abstract
Background Despite the crucial role of thiamine in glucose and energy metabolism pathways, there has been no published study examining the impact of thiamine on energy metabolism in humans. Objective To assess the effects of thiamine supplementation on resting energy expenditure (REE) in individuals with hyperglycemia. Methods Twelve hyperglycemic patients completed this double-blind, randomized trial, where all participants received both thiamine (300 mg/day) and matched placebo for 6 weeks in a cross-over manner. REE was assessed by indirect calorimetry. Anthropometric measurements, fasting and 2-h plasma glucose, and glucose-induced thermogenesis were also assessed at the beginning and on the completion of each six-week phase. Results Participants consuming thiamine supplements experienced a significant decrease in the REE assessed at week six compared to the baseline [mean (SE): 1478.93 (73.62) vs.1526.40 (73.46) kcal/d, p = 0.02], and the placebo arm (p = 0.002). These results did not change significantly after adjusting for the participants' body weight and physical activity as potential confounders. Six-week intervention had no significant effect on the participants' body weight or waist circumference, in either supplement or placebo arms (all p values>0.05). However, correlation analysis highlighted significant positive relationships between the changes in REE, and those in fasting (rs = 0.497, p = 0.019) and 2-h plasma glucose (rs = 0.498, p = 0.018) during the six-week intervention period. Conclusion Supplementation with high-dose thiamine may attenuate REE in patients with impaired glucose regulation. Our findings suggest that the impact of thiamine on REE may in part be explained by improved glycemic control. Trial registration Australian New Zealand Clinical Trials Registry ACTRN12611000051943. https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?ACTRN=12611000051943.
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de Bari L, Atlante A, Armeni T, Kalapos MP. Synthesis and metabolism of methylglyoxal, S-D-lactoylglutathione and D-lactate in cancer and Alzheimer's disease. Exploring the crossroad of eternal youth and premature aging. Ageing Res Rev 2019; 53:100915. [PMID: 31173890 DOI: 10.1016/j.arr.2019.100915] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 02/27/2019] [Accepted: 05/31/2019] [Indexed: 12/15/2022]
Abstract
Both cancer and Alzheimer's disease (AD) are emerging as metabolic diseases in which aberrant/dysregulated glucose metabolism and bioenergetics occur, and play a key role in disease progression. Interestingly, an enhancement of glucose uptake, glycolysis and pentose phosphate pathway occurs in both cancer cells and amyloid-β-resistant neurons in the early phase of AD. However, this metabolic shift has its adverse effects. One of them is the increase in methylglyoxal production, a physiological cytotoxic by-product of glucose catabolism. Methylglyoxal is mainly detoxified via cytosolic glyoxalase route comprising glyoxalase 1 and glyoxalase 2 with the production of S-D-lactoylglutathione and D-lactate as intermediate and end-product, respectively. Due to the existence of mitochondrial carriers and intramitochondrial glyoxalase 2 and D-lactate dehydrogenase, the transport and metabolism of both S-D-lactoylglutathione and D-lactate in mitochondria can contribute to methylglyoxal elimination, cellular antioxidant power and energy production. In this review, it is supposed that the different ability of cancer cells and AD neurons to metabolize methylglyoxal, S-D-lactoylglutathione and D-lactate scores cell fate, therefore being at the very crossroad of the "eternal youth" of cancer and the "premature death" of AD neurons. Understanding of these processes would help to elaborate novel metabolism-based therapies for cancer and AD treatment.
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Methylglyoxal – An emerging biomarker for diabetes mellitus diagnosis and its detection methods. Biosens Bioelectron 2019; 133:107-124. [DOI: 10.1016/j.bios.2019.03.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 03/07/2019] [Accepted: 03/07/2019] [Indexed: 02/07/2023]
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Abstract
Significance: Obesity and type 2 diabetes mellitus are increasing globally. There is also increasing associated complications, such as non-alcoholic fatty liver disease (NAFLD) and vascular complications of diabetes. There is currently no licensed treatment for NAFLD and no recent treatments for diabetic complications. New approaches are required, particularly those addressing mechanism-based risk factors for health decline and disease progression. Recent Advances: Dicarbonyl stress is the abnormal accumulation of reactive dicarbonyl metabolites such as methylglyoxal (MG) leading to cell and tissue dysfunction. It is a potential driver of obesity, diabetes, and related complications that are unaddressed by current treatments. Increased formation of MG is linked to increased glyceroneogenesis and hyperglycemia in obesity and diabetes and also down-regulation of glyoxalase 1 (Glo1)-which provides the main enzymatic detoxification of MG. Glo1 functional genomics studies suggest that increasing Glo1 expression and activity alleviates dicarbonyl stress; slows development of obesity, related insulin resistance; and prevents development of diabetic nephropathy and other microvascular complications of diabetes. A new therapeutic approach constitutes small-molecule inducers of Glo1 expression-Glo1 inducers-exploiting a regulatory antioxidant response element in the GLO1 gene. A prototype Glo1 inducer, trans-resveratrol (tRES)-hesperetin (HESP) combination, in corrected insulin resistance, improved glycemic control and vascular inflammation in healthy overweight and obese subjects in clinical trial. Critical Issues: tRES and HESP synergize pharmacologically, and HESP likely overcomes the low bioavailability of tRES by inhibition of intestinal glucuronosyltransferases. Future Directions: Glo1 inducers may now be evaluated in Phase 2 clinical trials for treatment of NAFLD and vascular complications of diabetes.
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Affiliation(s)
- Naila Rabbani
- 1 Clinical Sciences Research Laboratories, Warwick Medical School, University of Warwick, University Hospital , Coventry, United Kingdom .,2 Warwick Systems Biology Centre, Senate House, University of Warwick , Coventry, United Kingdom
| | - Paul J Thornalley
- 1 Clinical Sciences Research Laboratories, Warwick Medical School, University of Warwick, University Hospital , Coventry, United Kingdom .,2 Warwick Systems Biology Centre, Senate House, University of Warwick , Coventry, United Kingdom
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Shamsaldeen YA, Alsugoor MH, Lione LA, Benham CD. Dysfunction in nitric oxide synthesis in streptozotocin treated rat aorta and role of methylglyoxal. Eur J Pharmacol 2019; 842:321-328. [DOI: 10.1016/j.ejphar.2018.10.056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 10/31/2018] [Accepted: 10/31/2018] [Indexed: 12/14/2022]
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Wang XJ, Gao F, Li LC, Hui X, Li H, Gao WY. Quantitative analyses of α-dicarbonyl compounds in food samples by HPLC using 4-(2,3-dimethyl-6-quinoxalinyl)-1,2-benzenediamine as a derivatizing reagent. Microchem J 2018. [DOI: 10.1016/j.microc.2018.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Immunochemical studies on native and glycated LDL – An approach to uncover the structural perturbations. Int J Biol Macromol 2018; 115:287-299. [DOI: 10.1016/j.ijbiomac.2018.04.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Revised: 03/20/2018] [Accepted: 04/04/2018] [Indexed: 01/27/2023]
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Igoshi A, Noda K, Murata M. A novel thiamine-derived pigment, pyrizepine, formed by the Maillard reaction. Biosci Biotechnol Biochem 2018; 82:1425-1432. [PMID: 29699438 DOI: 10.1080/09168451.2018.1466687] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
To find a Maillard pigment derived from thiamine, a solution containing glucose and thiamine was heated and analyzed with high-performance liquid chromatography equipped with diode-array detection. As a result, a unique peak showing an absorption maximum at 380 nm was detected. This peak was then isolated from a reaction solution containing glucose, lysine and thiamine, and was identified as 1-(2-methyl-6,9-dihydro-5H-pyrimido[4,5-e][1,4]diazepin-7-yl)ethan-1-one using instrumental analyses. This compound, named pyrizepine, was a novel yellow pigment having a fused ring consisting of pyrimidine and diazepine. Pyrizepine was a major low-molecular-weight pigment in the reaction solution. The structure suggests that pyrizepine is formed by condensation reaction between a degradation product of thiamine and a tetrosone derivative formed from glucose by the Maillard reaction.
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Affiliation(s)
- Asuka Igoshi
- a Department of Nutrition and Food Science , Ochanomizu University , Tokyo , Japan
| | - Kyoko Noda
- a Department of Nutrition and Food Science , Ochanomizu University , Tokyo , Japan
| | - Masatsune Murata
- a Department of Nutrition and Food Science , Ochanomizu University , Tokyo , Japan
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Marinucci L, Balloni S, Fettucciari K, Bodo M, Talesa VN, Antognelli C. Nicotine induces apoptosis in human osteoblasts via a novel mechanism driven by H 2O 2 and entailing Glyoxalase 1-dependent MG-H1 accumulation leading to TG2-mediated NF-kB desensitization: Implication for smokers-related osteoporosis. Free Radic Biol Med 2018; 117:6-17. [PMID: 29355739 DOI: 10.1016/j.freeradbiomed.2018.01.017] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 01/11/2018] [Accepted: 01/15/2018] [Indexed: 12/11/2022]
Abstract
Nicotine contained in cigarette smoke contributes to the onset of several diseases, including osteoporosis, whose emerging pathogenic mechanism is associated with osteoblasts apoptosis. Scanty information is available on the molecular mechanisms of nicotine on osteoblasts apoptosis and, consequently, on an important aspect of the pathogenesis of smokers-related osteoporosis. Glyoxalase 1 (Glo1) is the detoxification enzyme of methylglyoxal (MG), a major precursor of advanced glycation end products (AGEs), potent pro-apoptotic agents. Hydroimidazolone (MG-H1) is the major AGE derived from the spontaneous MG adduction of arginine residues. The aim of this study was to investigate whether, and by means of which mechanism, the antiglycation defence Glo1 was involved in the apoptosis induced by 0.1 and 1µM nicotine in human primary osteoblasts chronically exposed for 11 and 21 days. By using gene overexpression/silencing and scavenging/inhibitory agents, we demonstrated that nicotine induces a significant intracellular accumulation of hydrogen peroxide (H2O2) that, by inhibiting Glo1, drives MG-H1 accumulation/release. MG-H1, in turn, triggers H2O2 overproduction via receptor for AGEs (RAGE) and, in parallel, an apoptotic mitochondrial pathway by inducing Transglutaminase 2 (TG2) downregulation-dependent NF-kB desensitization. Measurements of H2O2, Glo1 and MG-H1 circulating levels in smokers compared with non-smokers or in smokers with osteoporosis compared with those without this bone-related disease supported the results obtained in vitro. Our findings newly pose the antiglycation enzymatic defense Glo1 and MG-H1 among the molecular events involved in nicotine-induced reactive oxygen species-mediated osteoblasts apoptosis, a crucial event in smoker-related osteoporosis, and suggest novel exposure markers in health surveillance programmes related to smokers-associated osteoporosis.
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Affiliation(s)
| | - Stefania Balloni
- Department of Experimental Medicine, University of Perugia, Italy
| | | | - Maria Bodo
- Department of Experimental Medicine, University of Perugia, Italy
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Klaus A, Baldensperger T, Fiedler R, Girndt M, Glomb MA. Influence of Transketolase-Catalyzed Reactions on the Formation of Glycolaldehyde and Glyoxal Specific Posttranslational Modifications under Physiological Conditions. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:1498-1508. [PMID: 29400466 DOI: 10.1021/acs.jafc.7b05472] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In the present study, we investigated the role of transketolase (TK) in the modulation of glycolaldehyde driven Maillard reactions. In vitro experiments with recombinant human TK reduced glycolaldehyde and glyoxal induced carbonyl stress and thereby suppressed the formation of advanced glycation endproducts up to 70% due to the enzyme-catalyzed conversion of glycolaldehyde to erythrulose. This was further substantiated by the use of 13C-labeled compounds. For the first time, glycolaldehyde and other sugars involved in the TK reaction were quantified in vivo and compared to nondiabetic uremic patients undergoing hemodialysis. Quantitation revealed amounts of glycolaldehyde up to 2 μM and highlighted its crucial role in the formation of AGEs in vivo. In this context, a LC-MS2 method for the comprehensive detection of sedoheptulose-7-phosphate, fructose-6-phosphate, ribose-5-phosphate, erythrose-4-phosphate, erythrulose, and glycolaldehyde in whole blood, plasma, and red blood cells was established and validated based on derivatization with 1-naphthylamine and sodium cyanoborohydride.
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Affiliation(s)
- Alexander Klaus
- Institute of Chemistry, Food Chemistry, Martin-Luther-University Halle-Wittenberg , Kurt-Mothes-Strasse 2, 06120 Halle/Saale, Germany
| | - Tim Baldensperger
- Institute of Chemistry, Food Chemistry, Martin-Luther-University Halle-Wittenberg , Kurt-Mothes-Strasse 2, 06120 Halle/Saale, Germany
| | - Roman Fiedler
- Department of Internal Medicine II, Martin-Luther-University Halle-Wittenberg , Ernst-Grube-Strasse 40, 06120 Halle/Saale, Germany
| | - Matthias Girndt
- Department of Internal Medicine II, Martin-Luther-University Halle-Wittenberg , Ernst-Grube-Strasse 40, 06120 Halle/Saale, Germany
| | - Marcus A Glomb
- Institute of Chemistry, Food Chemistry, Martin-Luther-University Halle-Wittenberg , Kurt-Mothes-Strasse 2, 06120 Halle/Saale, Germany
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Dos Santos MM, Prestes AS, de Macedo GT, Ecker A, Barcelos RP, Boligon AA, Souza D, de Bem AF, da Rocha JBT, Barbosa NV. Syzygium cumini leaf extract inhibits LDL oxidation, but does not protect the liproprotein from glycation. JOURNAL OF ETHNOPHARMACOLOGY 2018; 210:69-79. [PMID: 28844679 DOI: 10.1016/j.jep.2017.08.033] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 08/22/2017] [Accepted: 08/24/2017] [Indexed: 06/07/2023]
Abstract
ETNOPHARMACOLOGICAL RELEVANCE Syzygium cumini (L.) Skeels is a plant widely used in folk medicine to treat diabetes mellitus (DM). The tea from its leaves is frequently used by diabetics for lowering hyperglycemia. There is a close relationship between DM and atherosclerosis, a chronic immuno-inflammatory disease, were the early stages encompass oxidative and glycative modifications in the structure of low density lipoprotein (LDL). AIM OF THIS STUDY To investigate the potential protective effects of aqueous-leaf extract from Syzygium cumini (S.cExt) against CuSO4-induced oxidation and methylglyoxal (MG)-induced glycation of human LDL in vitro. MATERIALS AND METHODS LDL oxidative changes were evaluated by measuring conjugated dienes (CD) formation, thiobarbituric acid reactive substances (TBARS) levels, quenching of tryptophan (Trp) fluorescence and structural modifications in LDL particle. In LDL glycated by MG (glyLDL), we determined the levels of fluorescent advanced glycation end products (AGEs) and mobility by agarose gel electrophoresis. RESULTS S.cExt blocked oxidative events induced by CuSO4 in human LDL, plasma and serum. Fourier transform infrared spectroscopy (FT-IR) revealed that specific regions of apoB100 were oxidized by CuSO4 in human LDL and that S.cExt reduced these oxidations. Unlike, the increased AGEs levels and eletrophoretic mobility observed in LDL MG-glycated were not modified by S.cExt. CONCLUSION The findings herein indicate that S.cExt could be tested in atherogenesis models as potential protective agent against LDL oxidation.
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Affiliation(s)
- Matheus M Dos Santos
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Alessandro S Prestes
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Gabriel T de Macedo
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Assis Ecker
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Rômulo P Barcelos
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil; Graduate Program in Bio-experimentation, University of Passo Fundo, Passo Fundo, RS, Brazil
| | - Aline A Boligon
- Department of Industrial Pharmacy, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Diego Souza
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Andreza F de Bem
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - João B T da Rocha
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Nilda V Barbosa
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil.
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Probing Protein Glycation by Chromatography and Mass Spectrometry: Analysis of Glycation Adducts. Int J Mol Sci 2017; 18:ijms18122557. [PMID: 29182540 PMCID: PMC5751160 DOI: 10.3390/ijms18122557] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2017] [Revised: 11/26/2017] [Accepted: 11/27/2017] [Indexed: 12/14/2022] Open
Abstract
Glycation is a non-enzymatic post-translational modification of proteins, formed by the reaction of reducing sugars and α-dicarbonyl products of their degradation with amino and guanidino groups of proteins. Resulted early glycation products are readily involved in further transformation, yielding a heterogeneous group of advanced glycation end products (AGEs). Their formation is associated with ageing, metabolic diseases, and thermal processing of foods. Therefore, individual glycation adducts are often considered as the markers of related pathologies and food quality. In this context, their quantification in biological and food matrices is required for diagnostics and establishment of food preparation technologies. For this, exhaustive protein hydrolysis with subsequent amino acid analysis is the strategy of choice. Thereby, multi-step enzymatic digestion procedures ensure good recoveries for the most of AGEs, whereas tandem mass spectrometry (MS/MS) in the multiple reaction monitoring (MRM) mode with stable isotope dilution or standard addition represents “a gold standard” for their quantification. Although the spectrum of quantitatively assessed AGE structures is continuously increases, application of untargeted profiling techniques for identification of new products is desired, especially for in vivo characterization of anti-glycative systems. Thereby, due to a high glycative potential of plant metabolites, more attention needs to be paid on plant-derived AGEs.
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Klaus A, Pfirrmann T, Glomb MA. Transketolase A from E. coli Significantly Suppresses Protein Glycation by Glycolaldehyde and Glyoxal in Vitro. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:8196-8202. [PMID: 28880548 DOI: 10.1021/acs.jafc.7b03183] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Short-chained carbonyl species such as glycolaldehyde and its oxidized pendant glyoxal are highly reactive Maillard agents, leading to the formation of protein modifications. These advanced glycation endproducts have gained considerable interest as they have been linked to various pathologies in vivo. The ability of transketolase to use glycolaldehyde as a substrate suggested the possibility to modulate carbonyl-driven Maillard reactions. Model incubations with recombinant transketolase A from Escherichia coli in the presence of bovine serum albumin and glycolaldehyde indeed led to a decrease in glycolaldehyde concentrations paralleled by the enzymatic conversion to erythrulose. As a result, reversibly protein-bound glycolaldehyde and the major final endproduct N6-carboxymethyl lysine were significantly reduced by approximately 50%, respectively. Glycolaldehyde is easily oxidized to glyoxal in the presence of amines and oxygen. In the presence of transketolase, the lower amounts of glycolaldehyde therefore also strongly suppressed the formation of glyoxal specific arginine modifications, measured as 5-(2-imino-5-oxo-1-imidazolidinyl)norvaline after acid hydrolysis.
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Affiliation(s)
- Alexander Klaus
- Institute of Chemistry, Food Chemistry, Martin-Luther-University Halle-Wittenberg , Kurt-Mothes-Str. 2, 06120 Halle/Saale, Germany
| | - Thorsten Pfirrmann
- Institute of Physiological Chemistry, Martin-Luther-University Halle-Wittenberg , Hollystr. 1, 06114 Halle/Saale, Germany
| | - Marcus A Glomb
- Institute of Chemistry, Food Chemistry, Martin-Luther-University Halle-Wittenberg , Kurt-Mothes-Str. 2, 06120 Halle/Saale, Germany
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Tejpal CS, Chatterjee NS, Elavarasan K, Lekshmi RGK, Anandan R, Asha KK, Ganesan B, Mathew S, Ravishankar CN. Dietary supplementation of thiamine and pyridoxine-loaded vanillic acid-grafted chitosan microspheres enhances growth performance, metabolic and immune responses in experimental rats. Int J Biol Macromol 2017; 104:1874-1881. [PMID: 28342754 DOI: 10.1016/j.ijbiomac.2017.03.120] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 03/07/2017] [Accepted: 03/21/2017] [Indexed: 12/25/2022]
Abstract
In the present investigation, the effect of dietary supplementation of thiamine and pyridoxine loaded vanillic acid-grafted chitosan microspheres (TPVGC) on growth, metabolic and immune responses in Wistar strain albino rats was studied. Eight experimental groups, namely four groups each for male and female rats were fed with 0, 0.4, 0.8 and 1.6% of TPVGC in the diet. At the end of 45days feeding trials, both male and female rats supplemented with TPVGC had higher weight gain% and specific growth rate than the control groups. Significantly (p<0.05) lower blood glucose level and higher respiratory burst activity were recorded in the treatment groups than the control groups of both male and female rats. Activity of metabolic enzymes (aspartate amino transferase, alanine aminotransferase, alkaline phosphatase and acid phosphatase) and antioxidant enzymes (superoxide dismutase, catalase and glutathione S-transferase) were significantly higher (p<0.05) in the control groups and a decreasing trend in the same was observed with a gradual increase in the inclusion level of TPVGC in the diet of the treatment groups. However, a reverse trend was observed for acetylcholine esterase. It was inferred that dietary supplementation of thiamine and pyridoxine loaded vanillic acid-grafted chitosan enhanced the growth performance, metabolic and immune responses in the animal-model.
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Affiliation(s)
- C S Tejpal
- ICAR-Central Institute of Fisheries Technology, Willingdon Island, Matsyapuri post, Cochin, 682029, India.
| | - N S Chatterjee
- ICAR-Central Institute of Fisheries Technology, Willingdon Island, Matsyapuri post, Cochin, 682029, India
| | - K Elavarasan
- ICAR-Central Institute of Fisheries Technology, Willingdon Island, Matsyapuri post, Cochin, 682029, India
| | - R G K Lekshmi
- ICAR-Central Institute of Fisheries Technology, Willingdon Island, Matsyapuri post, Cochin, 682029, India
| | - R Anandan
- ICAR-Central Institute of Fisheries Technology, Willingdon Island, Matsyapuri post, Cochin, 682029, India
| | - K K Asha
- ICAR-Central Institute of Fisheries Technology, Willingdon Island, Matsyapuri post, Cochin, 682029, India
| | - B Ganesan
- ICAR-Central Institute of Fisheries Technology, Willingdon Island, Matsyapuri post, Cochin, 682029, India
| | - S Mathew
- ICAR-Central Institute of Fisheries Technology, Willingdon Island, Matsyapuri post, Cochin, 682029, India
| | - C N Ravishankar
- ICAR-Central Institute of Fisheries Technology, Willingdon Island, Matsyapuri post, Cochin, 682029, India
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Reynaert NL, Gopal P, Rutten EP, Wouters EF, Schalkwijk CG. Advanced glycation end products and their receptor in age-related, non-communicable chronic inflammatory diseases; Overview of clinical evidence and potential contributions to disease. Int J Biochem Cell Biol 2016; 81:403-418. [DOI: 10.1016/j.biocel.2016.06.016] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 06/24/2016] [Accepted: 06/28/2016] [Indexed: 12/31/2022]
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The uremic toxin oxythiamine causes functional thiamine deficiency in end-stage renal disease by inhibiting transketolase activity. Kidney Int 2016; 90:396-403. [DOI: 10.1016/j.kint.2016.03.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 02/18/2016] [Accepted: 03/03/2016] [Indexed: 11/21/2022]
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3-Bromopyruvate induces rapid human prostate cancer cell death by affecting cell energy metabolism, GSH pool and the glyoxalase system. J Bioenerg Biomembr 2015; 47:493-506. [PMID: 26530987 DOI: 10.1007/s10863-015-9631-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 10/21/2015] [Indexed: 01/21/2023]
Abstract
3-bromopyruvate (3-BP) is an anti-tumour drug effective on hepatocellular carcinoma and other tumour cell types, which affects both glycolytic and mitochondrial targets, depleting cellular ATP pool. Here we tested 3-BP on human prostate cancer cells showing, differently from other tumour types, efficient ATP production and functional mitochondrial metabolism. We found that 3-BP rapidly induced cultured androgen-insensitive (PC-3) and androgen-responsive (LNCaP) prostate cancer cell death at low concentrations (IC(50) values of 50 and 70 μM, respectively) with a multimodal mechanism of action. In particular, 3-BP-treated PC-3 cells showed a selective, strong reduction of glyceraldeide 3-phosphate dehydrogenase activity, due to the direct interaction of the drug with the enzyme. Moreover, 3-BP strongly impaired both glutamate/malate- and succinate-dependent mitochondrial respiration, membrane potential generation and ATP synthesis, concomitant with the inhibition of respiratory chain complex I, II and ATP synthase activities. The drastic reduction of cellular ATP levels and depletion of GSH pool, associated with significant increase in cell oxidative stress, were found after 3-BP treatment of PC-3 cells. Interestingly, the activity of both glyoxalase I and II, devoted to the elimination of the cytotoxic methylglyoxal, was strongly inhibited by 3-BP. Both N-acetylcysteine and aminoguanidine, GSH precursor and methylglyoxal scavenger, respectively, prevented 3-BP-induced PC-3 cell death, showing that impaired cell antioxidant and detoxifying capacities are crucial events leading to cell death. The provided information on the multi-target cytotoxic action of 3-BP, finally leading to PC-3 cell necrosis, might be useful for future development of 3-BP as a therapeutic option for prostate cancer treatment.
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Abstract
Patients suffering from DN (diabetic neuropathy) suffer from the coexistence of positive (i.e. pain, hypersensitivity, tingling, cramps, cold feet, etc.) and negative (i.e. loss of sensory perception, delayed wound healing, etc.) symptoms. Elevated blood glucose alone cannot explain the development and progression of DN. Recently it has been shown that the endogenous reactive metabolite MG (methylglyoxal), elevated as a consequence of reduced Glo1 (glyoxalase I), can contribute to the gain of function via post-translational modification of neuronal ion channels involved in chemosensing and action potential generation in nociceptive nerve endings. The effects of dicarbonyls on the neuronal compartment provides a unifying mechanism for the development of DN. Targeting the accumulation and effects of MG may therefore provide new, more effective, therapeutic approaches for the treatment of DN.
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An efficient amperometric transketolase assay: Towards inhibitor screening. Biosens Bioelectron 2014; 62:90-6. [DOI: 10.1016/j.bios.2014.06.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 05/16/2014] [Accepted: 06/03/2014] [Indexed: 12/13/2022]
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Maruf AA, Lip H, Wong H, O'Brien PJ. Protective effects of ferulic acid and related polyphenols against glyoxal- or methylglyoxal-induced cytotoxicity and oxidative stress in isolated rat hepatocytes. Chem Biol Interact 2014; 234:96-104. [PMID: 25446858 DOI: 10.1016/j.cbi.2014.11.007] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 11/03/2014] [Accepted: 11/11/2014] [Indexed: 11/18/2022]
Abstract
Glyoxal (GO) and methylglyoxal (MGO) cause protein and nucleic acid carbonylation and oxidative stress by forming reactive oxygen and carbonyl species which have been associated with toxic effects that may contribute to cardiovascular disease, complications associated with diabetes mellitus, Alzheimer's and Parkinson's disease. GO and MGO can be formed through oxidation of commonly used reducing sugars e.g., fructose under chronic hyperglycemic conditions. GO and MGO form advanced glycation end products which lead to an increased potential for developing inflammatory diseases. In the current study, we have investigated the protective effects of ferulic acid and related polyphenols e.g., caffeic acid, p-coumaric acid, methyl ferulate, ethyl ferulate, and ferulaldehyde on GO- or MGO-induced cytotoxicity and oxidative stress (ROS formation, protein carbonylation and mitochondrial membrane potential maintenance) in freshly isolated rat hepatocytes. To investigate and compare the protective effects of ferulic acid and related polyphenols against GO- or MGO-induced toxicity, five hepatocyte models were used: (a) control hepatocytes, (b) GSH-depleted hepatocytes, (c) catalase-inhibited hepatocytes, (d) aldehyde dehydrogenase (ALDH2)-inhibited hepatocytes, and (e) hepatocyte inflammation system (a non-toxic H2O2-generating system). All of the polyphenols tested significantly decreased GO- or MGO-induced cytotoxicity, ROS formation and improved mitochondrial membrane potential in these models. The rank order of their effectiveness was caffeic acid∼ferulaldehyde>ferulic acid>ethyl ferulate>methyl ferulate>p-coumaric acid. Ferulic acid was found to decrease protein carbonylation in GSH-depleted hepatocytes. This study suggests that ferulic acid and related polyphenols can be used therapeutically to inhibit or decrease GO- or MGO-induced hepatotoxicity.
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Affiliation(s)
- Abdullah Al Maruf
- Graduate Department of Pharmaceutical Sciences, Leslie L. Dan Faculty of Pharmacy, University of Toronto, Canada
| | - HoYin Lip
- Graduate Department of Pharmaceutical Sciences, Leslie L. Dan Faculty of Pharmacy, University of Toronto, Canada
| | - Horace Wong
- Graduate Department of Pharmaceutical Sciences, Leslie L. Dan Faculty of Pharmacy, University of Toronto, Canada
| | - Peter J O'Brien
- Graduate Department of Pharmaceutical Sciences, Leslie L. Dan Faculty of Pharmacy, University of Toronto, Canada.
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Li XY, Huang HH, Hu K, Liu Y, Jiang WD, Jiang J, Li SH, Feng L, Zhou XQ. The effects of dietary thiamin on oxidative damage and antioxidant defence of juvenile fish. FISH PHYSIOLOGY AND BIOCHEMISTRY 2014; 40:673-687. [PMID: 24178923 DOI: 10.1007/s10695-013-9875-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Accepted: 10/03/2013] [Indexed: 06/02/2023]
Abstract
The present study explored the effects of thiamin on antioxidant capacity of juvenile Jian carp (Cyprinus carpio var. Jian). In a 60-day feeding trial, a total of 1,050 juvenile Jian carp (8.20 ± 0.02 g) were fed graded levels of thiamin at 0.25, 0.48, 0.79, 1.06, 1.37, 1.63 and 2.65 mg thiamin kg(-1) diets. The results showed that malondialdehyde and protein carbonyl contents in serum, hepatopancreas, intestine and muscle were significantly decreased with increasing dietary thiamin levels (P < 0.05). Conversely, the anti-superoxide anion capacity and anti-hydroxyl radical capacity in serum, hepatopancreas, intestine and muscle were the lowest in fish fed the thiamin-unsupplemented diet. Meanwhile, the activities of catalase (CAT), glutathione peroxidase, glutathione S-transferase and glutathione reductase, and the contents of glutathione in serum, hepatopancreas, intestine and muscle were enhanced with increasing dietary thiamin levels (P < 0.05). Superoxide dismutase (SOD) activity in serum, hepatopancreas and intestine followed a similar trend as CAT (P < 0.05). However, SOD activity in muscle was not affected by dietary thiamin level (P > 0.05). The results indicated that thiamin could improve antioxidant defence and inhibit lipid peroxidation and protein oxidation of juvenile Jian carp.
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Affiliation(s)
- Xue-Yin Li
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, 611130, China
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36
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Song DW, Xin N, Xie BJ, Li YJ, Meng LY, Li HM, Schläppi M, Deng YL. Formation of a salsolinol-like compound, the neurotoxin, 1-acetyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline, in a cellular model of hyperglycemia and a rat model of diabetes. Int J Mol Med 2013; 33:736-42. [PMID: 24366308 DOI: 10.3892/ijmm.2013.1604] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Accepted: 12/16/2013] [Indexed: 11/06/2022] Open
Abstract
There are statistical data indicating that diabetes is a risk factor for Parkinson's disease (PD). Methylglyoxal (MG), a biologically reactive byproduct of glucose metabolism, the levels of which have been shown to be increase in diabetes, reacts with dopamine to form 1-acetyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (ADTIQ); this formation may provide further insight into the connection between PD and diabetes. In this study, we investigated the role of ADTIQ in these two diseases to determine in an aim to enhance our understanding of the link between PD and diabetes. To this end, a cell model of hyperglycemia and a rat model of diabetes were established. In the cell model of hyperglycemia, compared with the control group, the elevated glucose levels promoted free hydroxyl radical formation (p<0.01). An ADTIQ assay was successfully developed and ADTIQ levels were detected and quantified. The levels of its precursors, MG and dopamine (DA), were determined in both the cell model of hyperglycemia and the rat model of diabetes. The proteins related to glucose metabolism were also assayed. Compared with the control group, ADTIQ and MG levels were significantly elevated not only in the cell model of hyperglycemia, but also in the brains of rats with diabetes (p<0.01). Seven key enzymes from the glycolytic pathway were found to be significantly more abundant in the brains of rats with diabetes. Moreover, it was found that adenosine triphosphate (ATP) synthase and superoxide dismutase (SOD) expression levels were markedly decreased in the rats with diabetes compared with the control group. Therefore, ADTIQ expression levels were found to be elevated under hyperglycemic conditions. The results reported herein demonstrate that ADTIQ, which is derived from MG, the levels of which are increased in diabetes, may serve as a neurotoxin to dopaminergic neurons, eventually leading to PD.
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Affiliation(s)
- De-Wei Song
- Division of Chemical Metrology and Analytical Science, National Institute of Metrology, Beijing 100013, P.R. China
| | - Nian Xin
- School of Life Science, Beijing Institute of Technology, Beijing 100081, P.R. China
| | - Bing-Jie Xie
- School of Life Science, Beijing Institute of Technology, Beijing 100081, P.R. China
| | - Yu-Juan Li
- School of Life Science, Beijing Institute of Technology, Beijing 100081, P.R. China
| | - Ling-Yan Meng
- School of Life Science, Beijing Institute of Technology, Beijing 100081, P.R. China
| | - Hong-Mei Li
- Division of Chemical Metrology and Analytical Science, National Institute of Metrology, Beijing 100013, P.R. China
| | | | - Yu-Lin Deng
- School of Life Science, Beijing Institute of Technology, Beijing 100081, P.R. China
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Touisni N, Charmantray F, Helaine V, Forano C, Hecquet L, Mousty C. Optimized immobilization of transketolase from E. coli in MgAl-layered double hydroxides. Colloids Surf B Biointerfaces 2013; 112:452-9. [DOI: 10.1016/j.colsurfb.2013.07.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 07/08/2013] [Indexed: 10/26/2022]
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Functional analysis of the AKR4C subfamily of Arabidopsis thaliana: model structures, substrate specificity, acrolein toxicity, and responses to light and [CO(2)]. Biosci Biotechnol Biochem 2013; 77:2038-45. [PMID: 24096666 DOI: 10.1271/bbb.130353] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In Arabidopsis thaliana, the aldo-keto reductase (AKR) family includes four enzymes (The AKR4C subfamily: AKR4C8, AKR4C9, AKR4C10, and AKR4C11). AKR4C8 and AKR4C9 might detoxify sugar-derived reactive carbonyls (RCs). We analyzed AKR4C10 and AKR4C11, and compared the enzymatic functions of the four enzymes. Modeling of protein structures based on the known structure of AKR4C9 found an (α/β)8-barrel motif in all four enzymes. Loop structures (A, B, and C) which determine substrate specificity, differed among the four. Both AKR4C10 and AKR4C11 reduced methylglyoxal. AKR4C10 reduced triose phosphates, dihydroxyacetone phosphate (DHAP), and glyceraldehydes 3-phosphate (GAP), the most efficiently of all the AKR4Cs. Acrolein, a lipid-derived RC, inactivated the four enzymes to different degrees. Expression of the AKR4C genes was induced under high-[CO2] and high light, when photosynthesis was enhanced and photosynthates accumulated in the cells. These results suggest that the AKR4C subfamily contributes to the detoxification of sugar-derived RCs in plants.
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Abstract
The elevation of plasma methylglyoxal levels in diabetic humans is widely observed, but it is unknown to what extent different sources of methylglyoxal contribute to its plasma concentration. A retrospective analysis of clinical findings has been undertaken. There is controversy about the correlation of plasma methylglyoxal concentrations with fasting or postprandial glucose levels, and the relationship with HbA1c. There is only one study in which plasma ketone body levels have been monitored in parallel with methylglyoxal and a positive correlation between plasma methylglyoxal and β-hydroxybutyrate was observed. There are no reports on plasma aminoacetone levels and methylglyoxal in diabetic humans. This paper suggests that although there is a close association between methylglyoxal and carbohydrate metabolism, the presence of this 1,2-dicarbonyl in the plasma is mainly due to other mechanisms. Protein glycation and aminoacetone degradation are proposed to be the major and the minor sources of plasma methylglyoxal under normal conditions.
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Gibson GE, Hirsch JA, Cirio RT, Jordan BD, Fonzetti P, Elder J. Abnormal thiamine-dependent processes in Alzheimer's Disease. Lessons from diabetes. Mol Cell Neurosci 2012; 55:17-25. [PMID: 22982063 DOI: 10.1016/j.mcn.2012.09.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2012] [Revised: 09/04/2012] [Accepted: 09/05/2012] [Indexed: 01/30/2023] Open
Abstract
Reduced glucose metabolism is an invariant feature of Alzheimer's Disease (AD) and an outstanding biomarker of disease progression. Glucose metabolism may be an attractive therapeutic target, whether the decline initiates AD pathophysiology or is a critical component of a cascade. The cause of cerebral regional glucose hypometabolism remains unclear. Thiamine-dependent processes are critical in glucose metabolism and are diminished in brains of AD patients at autopsy. Further, the reductions in thiamine-dependent processes are highly correlated to the decline in clinical dementia rating scales. In animal models, thiamine deficiency exacerbates plaque formation, promotes phosphorylation of tau and impairs memory. In contrast, treatment of mouse models of AD with the thiamine derivative benfotiamine diminishes plaques, decreases phosphorylation of tau and reverses memory deficits. Diabetes predisposes to AD, which suggests they may share some common mechanisms. Benfotiamine diminishes peripheral neuropathy in diabetic humans and animals. In diabetes, benfotiamine induces key thiamine-dependent enzymes of the pentose shunt to reduce accumulation of toxic metabolites including advanced glycation end products (AGE). Related mechanisms may lead to reversal of plaque formation by benfotiamine in animals. If so, the use of benfotiamine could provide a safe intervention to reverse biological and clinical processes of AD progression. This article is part of a Special Issue entitled 'Mitochondrial function and dysfunction in neurodegeneration'.
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Affiliation(s)
- Gary E Gibson
- Department of Neurology and Neuroscience, Weill Cornell Medical College, Burke Medical Research Institute, 785 Mamaroneck Avenue, White Plains, NY 10605, USA.
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Lupachyk S, Stavniichuk R, Komissarenko JI, Drel VR, Obrosov AA, El-Remessy AB, Pacher P, Obrosova IG. Na+/H+-exchanger-1 inhibition counteracts diabetic cataract formation and retinal oxidative-nitrative stress and apoptosis. Int J Mol Med 2012; 29:989-98. [PMID: 22407349 PMCID: PMC3375174 DOI: 10.3892/ijmm.2012.933] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Accepted: 02/13/2012] [Indexed: 12/20/2022] Open
Abstract
The Na+-H+-exchanger-1 (NHE-1) controls intracellular pH and glycolytic enzyme activities, and its expression and activity are increased by diabetes and high glucose. NHE-1-dependent upregulation of the upper part of glycolysis, under conditions of inhibition (lens) or insufficient activation (retina) of glyceraldehyde 3-phosphate dehydrogenase, underlies diversion of the excessive glycolytic flux towards several pathways contributing to oxidative stress, a causative factor in diabetic cataractogenesis and retinopathy. This study evaluated the role for NHE-1 in diabetic cataract formation and retinal oxidative stress and apoptosis. Control and streptozotocin-diabetic rats were maintained with or without treatment with the NHE-1 inhibitor cariporide (Sanofi-Aventis, 10 mgkg−1d−1) for 3.5 months. In in vitro studies, bovine retinal pericytes and endothelial cells were cultured in 5 or 30 mM glucose, with or without 10 μM cariporide, for 7 days. A several-fold increase of the by-product of glycolysis, α-glycerophosphate, indicative of activation of the upper part of glycolysis, was present in both rat lens and retina at an early (1-month) stage of streptozotocin-diabetes. Cariporide did not affect diabetic hyperglycemia and counteracted lens oxidative-nitrative stress and p38 MAPK activation, without affecting glucose or sorbitol pathway intermediate accumulation. Cataract formation (indirect ophthalmoscopy and slit-lamp examination) was delayed, but not prevented. The number of TUNEL-positive cells per flat-mounted retina was increased 4.4-fold in diabetic rats (101±17 vs. 23±8 in controls, P<0.01), and this increase was attenuated by cariporide (45±12, P<0.01). Nitrotyrosine and poly(ADP-ribose) fluorescence and percentage of TUNEL-positive cells were increased in pericytes and endothelial cells cultured in 30 mM glucose, and these changes were at least partially prevented by cariporide. In conclusion, NHE-1 contributes to diabetic cataract formation, and retinal oxidative-nitrative stress and apoptosis. The findings identify a new therapeutic target for diabetic ocular complications.
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Affiliation(s)
- Sergey Lupachyk
- Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, LA 70808, USA
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42
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Yang K, Qiang D, Delaney S, Mehta R, Bruce W, O’Brien PJ. Differences in glyoxal and methylglyoxal metabolism determine cellular susceptibility to protein carbonylation and cytotoxicity. Chem Biol Interact 2011; 191:322-9. [DOI: 10.1016/j.cbi.2011.02.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Revised: 02/11/2011] [Accepted: 02/12/2011] [Indexed: 11/26/2022]
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Kihm LP, Müller-Krebs S, Klein J, Ehrlich G, Mertes L, Gross ML, Adaikalakoteswari A, Thornalley PJ, Hammes HP, Nawroth PP, Zeier M, Schwenger V. Benfotiamine protects against peritoneal and kidney damage in peritoneal dialysis. J Am Soc Nephrol 2011; 22:914-26. [PMID: 21511829 DOI: 10.1681/asn.2010070750] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Residual renal function and the integrity of the peritoneal membrane contribute to morbidity and mortality among patients treated with peritoneal dialysis. Glucose and its degradation products likely contribute to the deterioration of the remnant kidney and damage to the peritoneum. Benfotiamine decreases glucose-induced tissue damage, suggesting the potential for benefit in peritoneal dialysis. Here, in a model of peritoneal dialysis in uremic rats, treatment with benfotiamine decreased peritoneal fibrosis, markers of inflammation, and neovascularization, resulting in improved characteristics of peritoneal transport. Furthermore, rats treated with benfotiamine exhibited lower expression of advanced glycation endproducts and their receptor in the peritoneum and the kidney, reduced glomerular and tubulointerstitial damage, and less albuminuria. Increased activity of transketolase in tissue and blood contributed to the protective effects of benfotiamine. In primary human peritoneal mesothelial cells, the addition of benfotiamine led to enhanced transketolase activity and decreased expression of advanced glycation endproducts and their receptor. Taken together, these data suggest that benfotiamine protects the peritoneal membrane and remnant kidney in a rat model of peritoneal dialysis and uremia.
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Affiliation(s)
- Lars P Kihm
- Department of Nephrology, University of Heidelberg, Im Neuenheimer Feld 162, 69120 Heidelberg, Germany.
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Rescuing hepatocytes from iron-catalyzed oxidative stress using vitamins B1 and B6. Toxicol In Vitro 2011; 25:1114-22. [PMID: 21457772 DOI: 10.1016/j.tiv.2011.03.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Revised: 03/22/2011] [Accepted: 03/23/2011] [Indexed: 11/22/2022]
Abstract
In the following rescue experiments, iron-mediated hepatocyte oxidative stress cytotoxicity was found to be prevented if vitamin B1 or B6 was added 1h after treatment with iron. The role of iron in catalyzing Fenton-mediated oxidative damage has been implicated in iron overload genetic diseases, carcinogenesis (colon cancer), Alzheimer's disease and complications associated with the metabolic syndrome through the generation of reactive oxygen species (ROS). The objectives of this study were to interpret the cytotoxic mechanisms and intracellular targets of oxidative stress using "accelerated cytotoxicity mechanism screening" techniques (ACMS) and to evaluate the rescue strategies of vitamins B1 and B6. Significant cytoprotection by antioxidants or ROS scavengers indicated that iron-mediated cytotoxicity could be attributed to reactive oxygen species. Of the B6 vitamers, pyridoxal was best at rescuing hepatocytes from iron-catalyzed lipid peroxidation (LPO), protein oxidation, and DNA damage, while pyridoxamine manifested greatest protection against ROS-mediated damage. Thiamin (B1) decreased LPO, mitochondrial and protein damage and DNA oxidation. Together, these results indicate that added B1 and B6 vitamins protect against the multiple targets of iron-catalyzed oxidative damage in hepatocytes. This study provides insight into the search for multi-targeted natural therapies to slow or retard the progression of diseases associated with Fenton-mediated oxidative damage.
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Gaens KH, Stehouwer CDA, Schalkwijk CG. The N ε-(carboxymethyl)lysine-RAGE axis: putative implications for the pathogenesis of obesity-related complications. Expert Rev Endocrinol Metab 2010; 5:839-854. [PMID: 30780826 DOI: 10.1586/eem.10.68] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Obesity is an important contributor to the burden of insulin resistance, Type 2 diabetes and cardiovascular disease. An important mechanism by which excess adiposity causes obesity-associated complications is the dysregulated production and secretion of biologically active molecules derived from adipocytes. These adipokines affect the vascular wall and contribute to the development of insulin resistance and Type 2 diabetes. However, factors that cause an increased production of pro-inflammatory adipokines, while decreasing anti-inflammatory adipokines, have not been fully clarified. Owing to local conditions in adipose tissue, that is, increased fatty acids, hypoxia and oxidative stress, we speculate that an increased formation of the major advanced lipoxidation end product, Nε-(carboxymethyl)lysine (CML), may play a role. CML-adducts in proteins are major ligands for the receptor for advanced glycation end products (RAGE). The consequence of RAGE activation by CML is the activation of important signaling inflammatory pathways. The putative role of CML-modified proteins in obesity is addressed in this article. The identification of this pathway may provide an important strategy for novel therapeutic approaches against obesity-associated complications.
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Affiliation(s)
- Katrien Hj Gaens
- a Department of Internal Medicine, Laboratory for Metabolism and Vascular Medicine, Maastricht University Medical Centre, P Debeyelaan 25, PO Box 5800, 6206 AZ Maastricht, The Netherlands
- b Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Coen DA Stehouwer
- a Department of Internal Medicine, Laboratory for Metabolism and Vascular Medicine, Maastricht University Medical Centre, P Debeyelaan 25, PO Box 5800, 6206 AZ Maastricht, The Netherlands
- b Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Casper G Schalkwijk
- a Department of Internal Medicine, Laboratory for Metabolism and Vascular Medicine, Maastricht University Medical Centre, P Debeyelaan 25, PO Box 5800, 6206 AZ Maastricht, The Netherlands
- b Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, Maastricht, The Netherlands
- c
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Advanced glycation end products as biomarkers and gerontotoxins – A basis to explore methylglyoxal-lowering agents for Alzheimer’s disease? Exp Gerontol 2010; 45:744-51. [DOI: 10.1016/j.exger.2010.03.001] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2009] [Revised: 02/23/2010] [Accepted: 03/01/2010] [Indexed: 12/21/2022]
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Fan X, Sell DR, Zhang J, Nemet I, Theves M, Lu J, Strauch C, Halushka MK, Monnier VM. Anaerobic vs aerobic pathways of carbonyl and oxidant stress in human lens and skin during aging and in diabetes: A comparative analysis. Free Radic Biol Med 2010; 49:847-56. [PMID: 20541005 PMCID: PMC2910832 DOI: 10.1016/j.freeradbiomed.2010.06.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Revised: 05/21/2010] [Accepted: 06/02/2010] [Indexed: 01/30/2023]
Abstract
The effects of anaerobic (lens) vs aerobic (skin) environment on carbonyl and oxidant stress are compared using de novo and existing data on advanced glycation and oxidation products in human crystallins and collagen. Almost all modifications increase with age. Methylglyoxal hydroimidazolones, carboxymethyllysine, and carboxyethyllysine are severalfold higher in lens than in skin and markedly increase upon incubation of lens crystallins with 5mM ascorbic acid. In contrast, fructose-lysine, glucosepane crosslinks, glyoxal hydroimidazolones, metal-catalyzed oxidation (allysine), and H(2)O(2)-dependent modifications (2-aminoapidic acid and methionine sulfoxide) are markedly elevated in skin, but relatively suppressed in the aging lens. In both tissues ornithine is the dominant modification, implicating arginine residues as the principal target of the Maillard reaction in vivo. Diabetes (here mostly type 2 studied) increases significantly fructose-lysine and glucosepane in both tissues (P<0.001) but has surprisingly little effect on the absolute level of most other advanced glycation end products. However, diabetes strengthens the Spearman correlation coefficients for age-related accumulation of hydrogen peroxide-mediated modifications in the lens. Overall, the data suggest that oxoaldehyde stress involving methylglyoxal from either glucose or ascorbate is predominant in the aging noncataractous lens, whereas aging skin collagen undergoes combined attack by nonoxidative glucose-mediated modifications, as well as those from metal-catalyzed oxidation and H(2)O(2).
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Affiliation(s)
- Xingjun Fan
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
| | - David R Sell
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
| | - Jianye Zhang
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
- Dept. of Chemistry, Case Western Reserve University, Cleveland, OH
| | - Ina Nemet
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
| | - Mathilde Theves
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
- Dept. of Biochemistry, Case Western Reserve University, Cleveland, OH
| | - Jie Lu
- Dept. of Pathology, John Hopkins Medical Institutions, Baltimore, MD USA
| | | | - Marc K. Halushka
- Dept. of Pathology, John Hopkins Medical Institutions, Baltimore, MD USA
| | - Vincent M. Monnier
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
- Dept. of Biochemistry, Case Western Reserve University, Cleveland, OH
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Tarallo S, Beltramo E, Berrone E, Dentelli P, Porta M. Effects of high glucose and thiamine on the balance between matrix metalloproteinases and their tissue inhibitors in vascular cells. Acta Diabetol 2010; 47:105-11. [PMID: 19404565 DOI: 10.1007/s00592-009-0124-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Accepted: 04/08/2009] [Indexed: 10/20/2022]
Abstract
Pericyte survival in diabetic retinopathy depends also on interactions with extracellular matrix (ECM) proteins, which are degraded by matrix metalloproteinases (MMP). Elevated glucose influences ECM turnover, through expression of MMP and their tissue inhibitors, TIMP. We reported on reduced pericyte adhesion to high glucose-conditioned ECM and correction by thiamine. We aimed at verifying the effects of thiamine and benfotiamine on MMP-2, MMP-9 and TIMP expression and activity in human vascular cells with high glucose. In HRP, MMP-2 activity, though not expression, increased with high glucose and decreased with thiamine and benfotiamine; TIMP-1 expression increased with high glucose plus thiamine and benfotiamine; MMP-9 was not expressed. In EC, MMP-9 and MMP-2 expression and activity increased with high glucose, but thiamine and benfotiamine had no effects; TIMP-1 expression was unchanged. Neither glucose nor thiamine modified TIMP-2 and TIMP-3 expression. TIMP-1 concentrations did not change in either HRP or EC. High glucose imbalances MMP/TIMP regulation, leading to increased ECM turnover. Thiamine and benfotiamine correct the increase in MMP-2 activity due to high glucose in HRP, while increasing TIMP-1.
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Affiliation(s)
- Sonia Tarallo
- Department of Internal Medicine, University of Turin, Corso Dogliotti 14, 10126, Turin, Italy.
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Dmitriev LF, Titov VN. Lipid peroxidation in relation to ageing and the role of endogenous aldehydes in diabetes and other age-related diseases. Ageing Res Rev 2010; 9:200-10. [PMID: 19800421 DOI: 10.1016/j.arr.2009.09.004] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2009] [Revised: 09/23/2009] [Accepted: 09/23/2009] [Indexed: 02/05/2023]
Abstract
Lipid intermediates which are generated by ROS have drawn more attention after it was found that lipid peroxidation and lipid-radical cycles are two alternative processes. In biological membranes alpha-tocopherol and cytochrome b5, as known, act synergistically to overcome free radical injury and to form lipid-radical cycles. These cycles activate membrane proteins, protect membrane lipids from oxidation and prevent from formation of endogenous aldehydes. Experimental and clinical evidence accumulated for 5-6 years suggests that endogenous aldehydes, such as malonic dialdehyde (MDA) and methylglyoxal (MG), are the major initiators of the metabolic disorders. The age-related diseases emerge when cells cannot control formation of aldehydes and/or cannot abolish the negative effect of methylglyoxal on their metabolism. If the efficiency of the glyoxalase system is insufficient toxic aldehydes cause cumulative damage over a lifetime. In this paper, we provide evidence to consider ageing as a process in which lipid-radical cycles gradually substitute for lipid peroxidation. There are always two opposing tendencies or actions which counteract each other - actions of melatonin, lipid-radical cycles and the glyoxalase system (anti-ageing effect) and negative actions of the toxic aldehydes (pro-ageing effect). Life span is determined by the balance of two opposing processes.
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Affiliation(s)
- L F Dmitriev
- Group of Neurobiology, Cardiology Research Center, 121552 Moscow, Russia.
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Katare RG, Caporali A, Oikawa A, Meloni M, Emanueli C, Madeddu P. Vitamin B1 analog benfotiamine prevents diabetes-induced diastolic dysfunction and heart failure through Akt/Pim-1-mediated survival pathway. Circ Heart Fail 2010; 3:294-305. [PMID: 20107192 DOI: 10.1161/circheartfailure.109.903450] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND The increasing incidence of diabetes mellitus will result in a new epidemic of heart failure unless novel treatments able to halt diabetic cardiomyopathy early in its course are introduced. This study aimed to determine whether the activity of the Akt/Pim-1 signaling pathway is altered at critical stages of diabetic cardiomyopathy and whether supplementation with vitamin B1 analog benfotiamine (BFT) helps to sustain the above prosurvival mechanism, thereby preserving cardiomyocyte viability and function. METHODS AND RESULTS Untreated streptozotocin-induced type 1 or leptin-receptor mutant type 2 diabetic mice showed diastolic dysfunction evolving to contractile impairment and cardiac dilatation and failure. BFT (70 mg/kg(-1)/d(-1)) improved diastolic and systolic function and prevented left ventricular end-diastolic pressure increase and chamber dilatation in both diabetic models. Moreover, BFT improved cardiac perfusion and reduced cardiomyocyte apoptosis and interstitial fibrosis. In hearts of untreated diabetic mice, the expression and activity of Akt/Pim-1 signaling declined along with O-N-acetylglucosamine modification of Akt, inhibition of pentose phosphate pathway, activation of oxidative stress, and accumulation of glycation end products. Furthermore, diabetes reduced pSTAT3 independently of Akt. BFT inhibited these effects of diabetes mellitus, thereby conferring cardiomyocytes with improved resistance to high glucose-induced damage. The phosphoinositide-3-kinase inhibitor LY294002 and dominant-negative Akt inhibited antiapoptotic action of BFT-induced and Pim-1 upregulation in high glucose-challenged cardiomyocytes. CONCLUSIONS These results show that BFT protects from diabetes mellitus-induced cardiac dysfunction through pleiotropic mechanisms, culminating in the activation of prosurvival signaling pathway. Thus, BFT merits attention for application in clinical practice.
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Affiliation(s)
- Rajesh G Katare
- Experimental Cardiovascular Medicine, Bristol Heart Institute, University of Bristol, United Kingdom
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