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Lopes MS, Baptistella GB, Nunes GG, Ferreira MV, Cunha JM, de Oliveira KM, Acco A, Lopes MLC, Couto Alves A, Valdameri G, Moure VR, Picheth G, Manica GCM, Rego FGM. A Non-Toxic Binuclear Vanadium(IV) Complex as Insulin Adjuvant Improves the Glycemic Control in Streptozotocin-Induced Diabetic Rats. Pharmaceuticals (Basel) 2024; 17:486. [PMID: 38675446 PMCID: PMC11054326 DOI: 10.3390/ph17040486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 03/30/2024] [Accepted: 04/04/2024] [Indexed: 04/28/2024] Open
Abstract
Diabetes mellitus (DM) complications are a burden to health care systems due to the associated consequences of poor glycemic control and the side effects of insulin therapy. Recently. adjuvant therapies, such as vanadium compounds, have gained attention due to their potential to improve glucose homeostasis in patients with diabetes. In order to determine the anti-diabetic and antioxidant effects of the oxidovanadium(IV) complex (Et3NH)2[{VO(OH}2)(ox)2(µ-ox)] or Vox2), rats with streptozotocin (STZ)-induced diabetes were treated with 30 and 100 mg/kg of Vox2, orally administered for 12 days. Vox2 at 100 mg/kg in association with insulin caused a 3.4 times decrease in blood glucose in STZ rats (424 mg/dL), reaching concentrations similar to those in the normoglycemic animals (126 mg/dL). Compared to insulin alone, the association with Vox2 caused an additional decrease in blood glucose of 39% and 65% at 30 and 100 mg/kg, respectively, and an increased pancreatic GSH levels 2.5 times. Vox2 alone did not cause gastrointestinal discomfort, diarrhea, and hepatic or renal toxicity and was not associated with changes in blood glucose level, lipid profile, or kidney or liver function. Our results highlight the potential of Vox2 in association with insulin in treating diabetes.
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Affiliation(s)
- Mateus S. Lopes
- Post-Graduation Program in Pharmaceutical Sciences, Federal University of Paraná, Curitiba 80210-170, PR, Brazil; (M.S.L.); (M.L.C.L.); (G.V.); (V.R.M.); (G.P.)
| | - Gabriel B. Baptistella
- Department of Chemistry, Federal University of Paraná, Curitiba 81531-980, PR, Brazil; (G.B.B.); (G.G.N.)
| | - Giovana G. Nunes
- Department of Chemistry, Federal University of Paraná, Curitiba 81531-980, PR, Brazil; (G.B.B.); (G.G.N.)
| | - Matheus V. Ferreira
- Post-Graduation Program in Pharmacology, Federal University of Paraná, Curitiba 81531-980, PR, Brazil; (M.V.F.); (J.M.C.); (K.M.d.O.); (A.A.)
| | - Joice Maria Cunha
- Post-Graduation Program in Pharmacology, Federal University of Paraná, Curitiba 81531-980, PR, Brazil; (M.V.F.); (J.M.C.); (K.M.d.O.); (A.A.)
| | - Kauê Marcel de Oliveira
- Post-Graduation Program in Pharmacology, Federal University of Paraná, Curitiba 81531-980, PR, Brazil; (M.V.F.); (J.M.C.); (K.M.d.O.); (A.A.)
| | - Alexandra Acco
- Post-Graduation Program in Pharmacology, Federal University of Paraná, Curitiba 81531-980, PR, Brazil; (M.V.F.); (J.M.C.); (K.M.d.O.); (A.A.)
| | - Maria Luiza C. Lopes
- Post-Graduation Program in Pharmaceutical Sciences, Federal University of Paraná, Curitiba 80210-170, PR, Brazil; (M.S.L.); (M.L.C.L.); (G.V.); (V.R.M.); (G.P.)
| | - Alexessander Couto Alves
- School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, UK;
| | - Glaucio Valdameri
- Post-Graduation Program in Pharmaceutical Sciences, Federal University of Paraná, Curitiba 80210-170, PR, Brazil; (M.S.L.); (M.L.C.L.); (G.V.); (V.R.M.); (G.P.)
| | - Vivian R. Moure
- Post-Graduation Program in Pharmaceutical Sciences, Federal University of Paraná, Curitiba 80210-170, PR, Brazil; (M.S.L.); (M.L.C.L.); (G.V.); (V.R.M.); (G.P.)
| | - Geraldo Picheth
- Post-Graduation Program in Pharmaceutical Sciences, Federal University of Paraná, Curitiba 80210-170, PR, Brazil; (M.S.L.); (M.L.C.L.); (G.V.); (V.R.M.); (G.P.)
| | - Graciele C. M. Manica
- Department of Bioscience One Health of Federal University of Santa Catarina, Curitibanos 88520-000, SC, Brazil;
| | - Fabiane G. M. Rego
- Post-Graduation Program in Pharmaceutical Sciences, Federal University of Paraná, Curitiba 80210-170, PR, Brazil; (M.S.L.); (M.L.C.L.); (G.V.); (V.R.M.); (G.P.)
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Paoletti A, Pencharz PB, Ball RO, Kong D, Xu L, Elango R, Courtney-Martin G. The Minimum Methionine Requirement for Adults Aged ≥60 Years Is the Same in Males and Females. Nutrients 2023; 15:4112. [PMID: 37836396 PMCID: PMC10574673 DOI: 10.3390/nu15194112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 09/18/2023] [Accepted: 09/21/2023] [Indexed: 10/15/2023] Open
Abstract
The minimum methionine requirement in the presence of excess dietary cysteine has not been determined in older adults. This study aimed to determine the minimum methionine requirement in healthy older adults using the indicator amino acid oxidation (IAAO) method. Fifteen healthy adults ≥ 60 years of age received seven methionine intakes (0 to 20 mg/kg/d) plus excess dietary cysteine (40 mg/kg/d). Oxidation of the indicator, L-[1-13C]phenylalanine (F13CO2), was used to estimate the mean minimum methionine requirement using a change-point mixed-effect model. There was no statistical difference between male and female requirement estimates, so the data were pooled to generate a mean of 5.1 mg/kg/d (Rm2 = 0.46, Rc2 = 0.77; p < 0.01; 95% CI: 3.67, 6.53 mg/kg/d). This is the first study to estimate the minimum methionine requirement in healthy older adults, which is the same between the sexes and as our lab's previous estimate in young adults. The findings are relevant considering current recommendations for increased consumption of plant foods, which will help to establish the appropriate balance of methionine and cysteine intake required to satisfy the sulphur amino acid requirements of older adults.
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Affiliation(s)
- Alyssa Paoletti
- Research Institute, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada; (A.P.); (P.B.P.)
- Department of Nutritional Sciences, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Paul B. Pencharz
- Research Institute, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada; (A.P.); (P.B.P.)
- Department of Nutritional Sciences, University of Toronto, Toronto, ON M5S 1A8, Canada
- Department of Pediatrics, University of Toronto, Toronto, ON M5S 1X8, Canada
| | - Ronald O. Ball
- Department of Agriculture, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada;
| | - Dehan Kong
- Department of Statistical Sciences, University of Toronto, Toronto, ON M5S 1X6, Canada;
| | - Libai Xu
- School of Mathematical Sciences, Soochow University, Suzhou 215006, China;
| | - Rajavel Elango
- Department of Pediatrics, School of Population and Public Health, University of British Columbia, Vancouver, BC V6H 0B3, Canada;
- British Columbia Children’s Hospital Research Institute, British Columbia Children’s Hospital, Vancouver, BC V6H 3N1, Canada
| | - Glenda Courtney-Martin
- Research Institute, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada; (A.P.); (P.B.P.)
- Department of Nutritional Sciences, University of Toronto, Toronto, ON M5S 1A8, Canada
- Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, ON M5S 3J7, Canada
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3
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Velagic A, Li JC, Qin CX, Li M, Deo M, Marshall SA, Anderson D, Woodman OL, Horowitz JD, Kemp-Harper BK, Ritchie RH. Cardioprotective Actions of Nitroxyl Donor Angeli's Salt are Preserved in the Diabetic Heart and Vasculature in the Face of Nitric Oxide Resistance. Br J Pharmacol 2022; 179:4117-4135. [PMID: 35365882 PMCID: PMC9540873 DOI: 10.1111/bph.15849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 02/14/2022] [Accepted: 03/09/2022] [Indexed: 11/29/2022] Open
Abstract
Background and Purpose The risk of fatal cardiovascular events is increased in patients with type 2 diabetes mellitus (T2DM). A major contributor to poor prognosis is impaired nitric oxide (NO•) signalling at the level of tissue responsiveness, termed NO• resistance. This study aimed to determine if T2DM promotes NO• resistance in the heart and vasculature and whether tissue responsiveness to nitroxyl (HNO) is affected. Experimental Approach At 8 weeks of age, male Sprague–Dawley rats commenced a high‐fat diet. After 2 weeks, the rats received low‐dose streptozotocin (two intraperitoneal injections, 35 mg·kg−1, over two consecutive days) and continued on the same diet. Twelve weeks later, isolated hearts were Langendorff‐perfused to assess responses to the NO• donor diethylamine NONOate (DEA/NO) and the HNO donor Angeli's salt. Isolated mesenteric arteries were utilised to measure vascular responsiveness to the NO• donors sodium nitroprusside (SNP) and DEA/NO, and the HNO donor Angeli's salt. Key Results Inotropic, lusitropic and coronary vasodilator responses to DEA/NO were impaired in T2DM hearts, whereas responses to Angeli's salt were preserved or enhanced. Vasorelaxation to Angeli's salt was augmented in T2DM mesenteric arteries, which were hyporesponsive to the relaxant effects of SNP and DEA/NO. Conclusion and Implications This is the first evidence that inotropic and lusitropic responses are preserved, and NO• resistance in the coronary and mesenteric vasculature is circumvented, by the HNO donor Angeli's salt in T2DM. These findings highlight the cardiovascular therapeutic potential of HNO donors, especially in emergencies such as acute ischaemia or heart failure.
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Affiliation(s)
- Anida Velagic
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia.,Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, VIC, Australia
| | - Jasmin Chendi Li
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia.,Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, VIC, Australia
| | - Cheng Xue Qin
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia.,Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, VIC, Australia
| | - Mandy Li
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia.,Biomedicine Discovery Institute, Department of Pharmacology, Monash University, Melbourne, VIC, Australia
| | - Minh Deo
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia.,Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, VIC, Australia
| | - Sarah A Marshall
- The Ritchie Centre, Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, VIC, Australia
| | - Dovile Anderson
- Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, VIC, Australia
| | - Owen L Woodman
- Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, VIC, Australia
| | - John D Horowitz
- Basil Hetzel Institute, Queen Elizabeth Hospital, University of Adelaide, SA, Australia
| | - Barbara K Kemp-Harper
- Biomedicine Discovery Institute, Department of Pharmacology, Monash University, Melbourne, VIC, Australia
| | - Rebecca H Ritchie
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia.,Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, VIC, Australia.,Biomedicine Discovery Institute, Department of Pharmacology, Monash University, Melbourne, VIC, Australia
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Saadeh K, Fazmin IT. Mitochondrial Dysfunction Increases Arrhythmic Triggers and Substrates; Potential Anti-arrhythmic Pharmacological Targets. Front Cardiovasc Med 2021; 8:646932. [PMID: 33659284 PMCID: PMC7917191 DOI: 10.3389/fcvm.2021.646932] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 01/26/2021] [Indexed: 12/31/2022] Open
Abstract
Incidence of cardiac arrhythmias increases significantly with age. In order to effectively stratify arrhythmic risk in the aging population it is crucial to elucidate the relevant underlying molecular mechanisms. The changes underlying age-related electrophysiological disruption appear to be closely associated with mitochondrial dysfunction. Thus, the present review examines the mechanisms by which age-related mitochondrial dysfunction promotes arrhythmic triggers and substrate. Namely, via alterations in plasmalemmal ionic currents (both sodium and potassium), gap junctions, cellular Ca2+ homeostasis, and cardiac fibrosis. Stratification of patients' mitochondrial function status permits application of appropriate anti-arrhythmic therapies. Here, we discuss novel potential anti-arrhythmic pharmacological interventions that specifically target upstream mitochondrial function and hence ameliorates the need for therapies targeting downstream changes which have constituted traditional antiarrhythmic therapy.
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Affiliation(s)
- Khalil Saadeh
- School of Clinical Medicine, University of Cambridge, Cambridge, United Kingdom.,Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom
| | - Ibrahim Talal Fazmin
- School of Clinical Medicine, University of Cambridge, Cambridge, United Kingdom.,Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom.,Royal Papworth Hospital NHS Foundation Trust, Cambridge, United Kingdom
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5
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Alomar FA, Al-Rubaish A, Al-Muhanna F, Al-Ali AK, McMillan J, Singh J, Bidasee KR. Adeno-Associated Viral Transfer of Glyoxalase-1 Blunts Carbonyl and Oxidative Stresses in Hearts of Type 1 Diabetic Rats. Antioxidants (Basel) 2020; 9:E592. [PMID: 32640624 PMCID: PMC7402150 DOI: 10.3390/antiox9070592] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 07/01/2020] [Accepted: 07/02/2020] [Indexed: 02/06/2023] Open
Abstract
Accumulation of methylglyoxal (MG) arising from downregulation of its primary degrading enzyme glyoxalase-1 (Glo1) is an underlying cause of diabetic cardiomyopathy (DC). This study investigated if expressing Glo1 in rat hearts shortly after the onset of Type 1 diabetes mellitus (T1DM) would blunt the development of DC employing the streptozotocin-induced T1DM rat model, an adeno-associated virus containing Glo1 driven by the endothelin-1 promoter (AAV2/9-Endo-Glo1), echocardiography, video edge, confocal imaging, and biochemical/histopathological assays. After eight weeks of T1DM, rats developed DC characterized by a decreased E:A ratio, fractional shortening, and ejection fraction, and increased isovolumetric relaxation time, E: e' ratio, and circumferential and longitudinal strains. Evoked Ca2+ transients and contractile kinetics were also impaired in ventricular myocytes. Hearts from eight weeks T1DM rats had lower Glo1 and GSH levels, elevated carbonyl/oxidative stress, microvascular leakage, inflammation, and fibrosis. A single injection of AAV2/9 Endo-Glo1 (1.7 × 1012 viron particles/kg) one week after onset of T1DM, potentiated GSH, and blunted MG accumulation, carbonyl/oxidative stress, microvascular leakage, inflammation, fibrosis, and impairments in cardiac and myocyte functions that develop after eight weeks of T1DM. These new data indicate that preventing Glo1 downregulation by administering AAV2/9-Endo-Glo1 to rats one week after the onset of T1DM, blunted the DC that develops after eight weeks of diabetes by attenuating carbonyl/oxidative stresses, microvascular leakage, inflammation, and fibrosis.
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Affiliation(s)
- Fadhel A. Alomar
- Department of Pharmacology and Toxicology, College of Clinical Pharmacy, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia
| | - Abdullah Al-Rubaish
- Department of Internal Medicine, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia; (A.A.-R.); (F.A.-M.)
| | - Fahad Al-Muhanna
- Department of Internal Medicine, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia; (A.A.-R.); (F.A.-M.)
| | - Amein K. Al-Ali
- Institute for Research and Medical Consultation, Imam Abdulrahman bin Faisal University, Dammam 31441, Saudi Arabia;
| | - JoEllyn McMillan
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198-5800, USA;
- Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Omaha, NE 68198-5800, USA
| | - Jaipaul Singh
- College of Science and Technology, University of Central Lancashire, Preton PR1 2HE, England, UK;
| | - Keshore R. Bidasee
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198-5800, USA;
- Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Omaha, NE 68198-5800, USA
- Nebraska Redox Biology Center, Lincoln, NE 68588-0662, USA
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Dludla PV, Dias SC, Obonye N, Johnson R, Louw J, Nkambule BB. A Systematic Review on the Protective Effect of N-Acetyl Cysteine Against Diabetes-Associated Cardiovascular Complications. Am J Cardiovasc Drugs 2018; 18:283-298. [PMID: 29623672 DOI: 10.1007/s40256-018-0275-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
INTRODUCTION Heart failure is the leading cause of death in patients with diabetes. No treatment currently exists to specifically protect these patients at risk of developing cardiovascular complications. Accelerated oxidative stress-induced tissue damage due to persistent hyperglycemia is one of the major factors implicated in deteriorated cardiac function within a diabetic state. N-acetyl cysteine (NAC), through its enhanced capacity to endogenously synthesize glutathione, a potent antioxidant, has displayed abundant health-promoting properties and has a favorable safety profile. OBJECTIVE An increasing number of experimental studies have reported on the strong ameliorative properties of NAC. We systematically reviewed the data on the cardioprotective potential of this compound to provide an informative summary. METHODS Two independent reviewers systematically searched major databases, including PubMed, Cochrane Library, Google scholar, and Embase for available studies reporting on the ameliorative effects of NAC as a monotherapy or in combination with other therapies against diabetes-associated cardiovascular complications. We used the ARRIVE and JBI appraisal guidelines to assess the quality of individual studies included in the review. A meta-analysis could not be performed because the included studies were heterogeneous and data from randomized clinical trials were unavailable. RESULTS Most studies support the ameliorative potential of NAC against a number of diabetes-associated complications, including oxidative stress. We discuss future prospects, such as identification of additional molecular mechanisms implicated in diabetes-induced cardiac damage, and highlight limitations, such as insufficient studies reporting on the comparative effect of NAC with common glucose-lowering therapies. Information on the comparative analysis of NAC, in terms of dose selection, administration mode, and its effect on different cardiovascular-related markers is important for translation into clinical studies. CONCLUSIONS NAC exhibits strong potential for the protection of the diabetic heart at risk of myocardial infarction through inhibition of oxidative stress. The effect of NAC in preventing both ischemia and non-ischemic-associated cardiac damage is also of interest. Consistency in dose selection in most studies reported remains important in dose translation for clinical relevance.
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Kwak MK, Ku M, Kang SO. Inducible NAD(H)-linked methylglyoxal oxidoreductase regulates cellular methylglyoxal and pyruvate through enhanced activities of alcohol dehydrogenase and methylglyoxal-oxidizing enzymes in glutathione-depleted Candida albicans. Biochim Biophys Acta Gen Subj 2018; 1862:18-39. [DOI: 10.1016/j.bbagen.2017.10.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 09/30/2017] [Accepted: 10/06/2017] [Indexed: 12/15/2022]
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Porosk R, Kilk K, Mahlapuu R, Terasmaa A, Soomets U. Glutathione system in Wolfram syndrome 1‑deficient mice. Mol Med Rep 2017; 16:7092-7097. [PMID: 28901522 DOI: 10.3892/mmr.2017.7419] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Accepted: 07/27/2017] [Indexed: 11/06/2022] Open
Abstract
Wolfram syndrome 1 (WS) is a rare neurodegenerative disease that is caused by mutations in the Wolfram syndrome 1 (WFS1) gene, which encodes the endoplasmic reticulum (ER) glycoprotein wolframin. The pathophysiology of WS is ER stress, which is generally considered to induce oxidative stress. As WS has a well‑defined monogenetic origin and a model for chronic ER stress, the present study aimed to characterize how glutathione (GSH), a major intracellular antioxidant, was related to the disease and its progression. The concentration of GSH and the activities of reduction/oxidation system enzymes GSH peroxidase and GSH reductase were measured in Wfs1‑deficient mice. The GSH content was lower in most of the studied tissues, and the activities of antioxidative enzymes varied between the heart, kidneys and liver tissues. The results indicated that GSH may be needed for ER stress control; however, chronic ER stress from the genetic syndrome eventually depletes the cellular GSH pool and leads to increased oxidative stress.
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Affiliation(s)
- Rando Porosk
- Department of Biochemistry, Institute of Biomedicine and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
| | - Kalle Kilk
- Department of Biochemistry, Institute of Biomedicine and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
| | - Riina Mahlapuu
- Department of Biochemistry, Institute of Biomedicine and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
| | - Anton Terasmaa
- Centre of Excellence for Genomics and Translational Medicine, Institute of Biomedicine and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
| | - Ursel Soomets
- Department of Biochemistry, Institute of Biomedicine and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
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Yang KC, Kyle JW, Makielski JC, Dudley SC. Mechanisms of sudden cardiac death: oxidants and metabolism. Circ Res 2015; 116:1937-55. [PMID: 26044249 PMCID: PMC4458707 DOI: 10.1161/circresaha.116.304691] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2014] [Accepted: 02/09/2015] [Indexed: 02/07/2023]
Abstract
Ventricular arrhythmia is the leading cause of sudden cardiac death (SCD). Deranged cardiac metabolism and abnormal redox state during cardiac diseases foment arrhythmogenic substrates through direct or indirect modulation of cardiac ion channel/transporter function. This review presents current evidence on the mechanisms linking metabolic derangement and excessive oxidative stress to ion channel/transporter dysfunction that predisposes to ventricular arrhythmias and SCD. Because conventional antiarrhythmic agents aiming at ion channels have proven challenging to use, targeting arrhythmogenic metabolic changes and redox imbalance may provide novel therapeutics to treat or prevent life-threatening arrhythmias and SCD.
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Affiliation(s)
- Kai-Chien Yang
- From the Department of Pharmacology (K.-C.Y.) and Division of Cardiology, Department of Internal Medicine (K.-C.Y.), National Taiwan University Hospital, Taipei, Taiwan; Division of Cardiovascular Medicine, Department of Medicine, University of Wisconsin, Madison (J.W.K., J.C.M.); and Lifespan Cardiovascular Institute, the Providence VA Medical Center, and Brown University, RI (S.C.D.)
| | - John W Kyle
- From the Department of Pharmacology (K.-C.Y.) and Division of Cardiology, Department of Internal Medicine (K.-C.Y.), National Taiwan University Hospital, Taipei, Taiwan; Division of Cardiovascular Medicine, Department of Medicine, University of Wisconsin, Madison (J.W.K., J.C.M.); and Lifespan Cardiovascular Institute, the Providence VA Medical Center, and Brown University, RI (S.C.D.)
| | - Jonathan C Makielski
- From the Department of Pharmacology (K.-C.Y.) and Division of Cardiology, Department of Internal Medicine (K.-C.Y.), National Taiwan University Hospital, Taipei, Taiwan; Division of Cardiovascular Medicine, Department of Medicine, University of Wisconsin, Madison (J.W.K., J.C.M.); and Lifespan Cardiovascular Institute, the Providence VA Medical Center, and Brown University, RI (S.C.D.).
| | - Samuel C Dudley
- From the Department of Pharmacology (K.-C.Y.) and Division of Cardiology, Department of Internal Medicine (K.-C.Y.), National Taiwan University Hospital, Taipei, Taiwan; Division of Cardiovascular Medicine, Department of Medicine, University of Wisconsin, Madison (J.W.K., J.C.M.); and Lifespan Cardiovascular Institute, the Providence VA Medical Center, and Brown University, RI (S.C.D.).
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10
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Yang KC, Bonini MG, Dudley SC. Mitochondria and arrhythmias. Free Radic Biol Med 2014; 71:351-361. [PMID: 24713422 PMCID: PMC4096785 DOI: 10.1016/j.freeradbiomed.2014.03.033] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Revised: 03/21/2014] [Accepted: 03/24/2014] [Indexed: 12/31/2022]
Abstract
Mitochondria are essential to providing ATP, thereby satisfying the energy demand of the incessant electrical activity and contractile action of cardiac muscle. Emerging evidence indicates that mitochondrial dysfunction can adversely affect cardiac electrical functioning by impairing the intracellular ion homeostasis and membrane excitability through reduced ATP production and excessive reactive oxygen species (ROS) generation, resulting in increased propensity to cardiac arrhythmias. In this review, the molecular mechanisms linking mitochondrial dysfunction to cardiac arrhythmias are discussed with an emphasis on the impact of increased mitochondrial ROS on the cardiac ion channels and transporters that are critical to maintaining normal electromechanical functioning of the cardiomyocytes. The potential of using mitochondria-targeted antioxidants as a novel antiarrhythmia therapy is highlighted.
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Affiliation(s)
- Kai-Chien Yang
- Lifespan Cardiovascular Institute, Providence VA Medical Center, and Brown University, Providence, RI 02903, USA
| | - Marcelo G Bonini
- Department of Medicine/Cardiology, University of Illinois at Chicago, Chicago, IL 60612, USA; Department of Pathology, and University of Illinois at Chicago, Chicago, IL 60612, USA; Department of Pharmacology, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Samuel C Dudley
- Lifespan Cardiovascular Institute, Providence VA Medical Center, and Brown University, Providence, RI 02903, USA.
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11
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Lamberts RR, Lingam SJ, Wang HY, Bollen IAE, Hughes G, Galvin IF, Bunton RW, Bahn A, Katare R, Baldi JC, Williams MJA, Saxena P, Coffey S, Jones PP. Impaired relaxation despite upregulated calcium-handling protein atrial myocardium from type 2 diabetic patients with preserved ejection fraction. Cardiovasc Diabetol 2014; 13:72. [PMID: 24708792 PMCID: PMC3997226 DOI: 10.1186/1475-2840-13-72] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 03/26/2014] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Diastolic dysfunction is a key factor in the development and pathology of cardiac dysfunction in diabetes, however the exact underlying mechanism remains unknown, especially in humans. We aimed to measure contraction, relaxation, expression of calcium-handling proteins and fibrosis in myocardium of diabetic patients with preserved systolic function. METHODS Right atrial appendages from patients with type 2 diabetes mellitus (DM, n = 20) and non-diabetic patients (non-DM, n = 36), all with preserved ejection fraction and undergoing coronary artery bypass grafting (CABG), were collected. From appendages, small cardiac muscles, trabeculae, were isolated to measure basal and β-adrenergic stimulated myocardial function. Expression levels of calcium-handling proteins, sarcoplasmic reticulum Ca2+ ATPase (SERCA2a) and phospholamban (PLB), and of β1-adrenoreceptors were determined in tissue samples by Western blot. Collagen deposition was determined by picro-sirius red staining. RESULTS In trabeculae from diabetic samples, contractile function was preserved, but relaxation was prolonged (Tau: 74 ± 13 ms vs. 93 ± 16 ms, non-DM vs. DM, p = 0.03). The expression of SERCA2a was increased in diabetic myocardial tissue (0.75 ± 0.09 vs. 1.23 ± 0.15, non-DM vs. DM, p = 0.007), whereas its endogenous inhibitor PLB was reduced (2.21 ± 0.45 vs. 0.42 ± 0.11, non-DM vs. DM, p = 0.01). Collagen deposition was increased in diabetic samples. Moreover, trabeculae from diabetic patients were unresponsive to β-adrenergic stimulation, despite no change in β1-adrenoreceptor expression levels. CONCLUSIONS Human type 2 diabetic atrial myocardium showed increased fibrosis without systolic dysfunction but with impaired relaxation, especially during β-adrenergic challenge. Interestingly, changes in calcium-handling protein expression suggests accelerated active calcium re-uptake, thus improved relaxation, indicating a compensatory calcium-handling mechanism in diabetes in an attempt to maintain diastolic function at rest despite impaired relaxation in the diabetic fibrotic atrial myocardium. Our study addresses important aspects of the underlying mechanisms of diabetes-associated diastolic dysfunction, which is crucial to developing new therapeutic treatments.
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Affiliation(s)
- Regis R Lamberts
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Shivanjali J Lingam
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Heng-Yu Wang
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Ilse AE Bollen
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Gillian Hughes
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Ivor F Galvin
- Department of Cardiothoracic Surgery, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Richard W Bunton
- Department of Cardiothoracic Surgery, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Andrew Bahn
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Rajesh Katare
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - J Chris Baldi
- Department of Medicine – HeartOtago, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Michael JA Williams
- Department of Medicine – HeartOtago, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Pankaj Saxena
- Department of Cardiothoracic Surgery, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Sean Coffey
- Department of Medicine – HeartOtago, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Peter P Jones
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
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12
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Tian C, Alomar F, Moore CJ, Shao CH, Kutty S, Singh J, Bidasee KR. Reactive carbonyl species and their roles in sarcoplasmic reticulum Ca2+ cycling defect in the diabetic heart. Heart Fail Rev 2014; 19:101-12. [PMID: 23430128 PMCID: PMC4732283 DOI: 10.1007/s10741-013-9384-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Efficient and rhythmic cardiac contractions depend critically on the adequate and synchronized release of Ca(2+) from the sarcoplasmic reticulum (SR) via ryanodine receptor Ca(2+) release channels (RyR2) and its reuptake via sarco(endo)plasmic reticulum Ca(2+)-ATPase (SERCA2a). It is well established that this orchestrated process becomes compromised in diabetes. What remain incompletely defined are the molecular mechanisms responsible for the dysregulation of RyR2 and SERCA2a in diabetes. Earlier, we found elevated levels of carbonyl adducts on RyR2 and SERCA2a isolated from hearts of type 1 diabetic rats and showed the presence of these posttranslational modifications compromised their functions. We also showed that these mono- and di-carbonyl reactive carbonyl species (RCS) do not indiscriminately react with all basic amino acid residues on RyR2 and SERCA2a; some residues are more susceptible to carbonylation (modification by RCS) than others. A key unresolved question in the field is which of the many RCS that are upregulated in the heart in diabetes chemically react with RyR2 and SERCA2a? This brief review introduces readers to the field of RCS and their roles in perturbing SR Ca(2+) cycling in diabetes. It also provides new experimental evidence that not all RCS that are upregulated in the heart in diabetes chemically react with RyR2 and SERCA2a, methylglyoxal and glyoxal preferentially do.
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Affiliation(s)
- Chengju Tian
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198
| | - Fadhel Alomar
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198
- Department of Pharmacology, University of Dammam, Kingdom of Saudi Arabia
| | - Caronda J Moore
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198
| | - Chun Hong Shao
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198
| | - Shelby Kutty
- Joint Division of Pediatric Cardiology, University of Nebraska/Creighton University and Children's Hospital and Medical Center, Omaha, Nebraska
| | - Jaipaul Singh
- School of Forensic and Investigative Sciences and School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, UK
| | - Keshore R. Bidasee
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198
- Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Omaha, NE 68198
- Nebraska Center for Redox Biology, N146 Beadle Center, Lincoln NE 68588-0662
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13
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Abstract
Since diabetic cardiomyopathy was first reported four decades ago, substantial information on its pathogenesis and clinical features has accumulated. In the heart, diabetes enhances fatty acid metabolism, suppresses glucose oxidation, and modifies intracellular signaling, leading to impairments in multiple steps of excitation–contraction coupling, inefficient energy production, and increased susceptibility to ischemia/reperfusion injury. Loss of normal microvessels and remodeling of the extracellular matrix are also involved in contractile dysfunction of diabetic hearts. Use of sensitive echocardiographic techniques (tissue Doppler imaging and strain rate imaging) and magnetic resonance spectroscopy enables detection of diabetic cardiomyopathy at an early stage, and a combination of the modalities allows differentiation of this type of cardiomyopathy from other organic heart diseases. Circumstantial evidence to date indicates that diabetic cardiomyopathy is a common but frequently unrecognized pathological process in asymptomatic diabetic patients. However, a strategy for prevention or treatment of diabetic cardiomyopathy to improve its prognosis has not yet been established. Here, we review both basic and clinical studies on diabetic cardiomyopathy and summarize problems remaining to be solved for improving management of this type of cardiomyopathy.
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Affiliation(s)
- Takayuki Miki
- Division of Cardiology, Second Department of Internal Medicine, School of Medicine, Sapporo Medical University, South-1 West-16, Chuo-ku, Sapporo, 060-8543, Japan
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14
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Xie C, Biary N, Tocchetti CG, Aon MA, Paolocci N, Kauffman J, Akar FG. Glutathione oxidation unmasks proarrhythmic vulnerability of chronically hyperglycemic guinea pigs. Am J Physiol Heart Circ Physiol 2013; 304:H916-26. [PMID: 23376824 DOI: 10.1152/ajpheart.00026.2012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Chronic hyperglycemia in type-1 diabetes mellitus is associated with oxidative stress (OS) and sudden death. Mechanistic links remain unclear. We investigated changes in electrophysiological (EP) properties in a model of chronic hyperglycemia before and after challenge with OS by GSH oxidation and tested reversibility of EP remodeling by insulin. Guinea pigs survived for 1 mo following streptozotocin (STZ) or saline (sham) injection. A treatment group received daily insulin for 2 wk to reverse STZ-induced hyperglycemia (STZ + Ins). EP properties were measured using high-resolution optical action potential mapping before and after challenge of hearts with diamide. Despite elevation of glucose levels in STZ compared with sham-operated (P = 0.004) and STZ + Ins (P = 0.002) animals, average action potential duration (APD) and arrhythmia propensity were not altered at baseline. Diamide promoted early (<10 min) formation of arrhythmic triggers reflected by a higher arrhythmia scoring index in STZ (P = 0.045) and STZ + Ins (P = 0.033) hearts compared with sham-operated hearts. APD heterogeneity underwent a more pronounced increase in response to diamide in STZ and STZ + Ins hearts compared with sham-operated hearts. Within 30 min, diamide resulted in spontaneous incidence of ventricular tachycardia and ventricular fibrillation (VT/VF) in 3/6, 2/5, 1/5, and 0/4 STZ, STZ + Ins, sham-operated, and normal hearts, respectively. Hearts prone to VT/VF exhibited greater APD heterogeneity (P = 0.010) compared with their VT/VF-free counterparts. Finally, altered EP properties in STZ were not rescued by insulin. In conclusion, GSH oxidation enhances APD heterogeneity and increases arrhythmia scoring index in a guinea pig model of chronic hyperglycemia. Despite normalization of glycemic levels by insulin, these proarrhythmic properties are not reversed, suggesting the importance of targeting antioxidant defenses for arrhythmia suppression.
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Affiliation(s)
- Chaoqin Xie
- Cardiovascular Institute, Mount Sinai School of Medicine, New York, NY 10029, USA
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15
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Abstract
Reactive oxygen species (ROS) have been associated with various human diseases, and considerable attention has been paid to investigate their physiological effects. Various ROS are synthesized in the mitochondria and accumulate in the cytoplasm if the cellular antioxidant defense mechanism fails. The critical balance of this ROS synthesis and antioxidant defense systems is termed the redox system of the cell. Various cardiovascular diseases have also been affected by redox to different degrees. ROS have been indicated as both detrimental and protective, via different cellular pathways, for cardiac myocyte functions, electrophysiology, and pharmacology. Mostly, the ROS functions depend on the type and amount of ROS synthesized. While the literature clearly indicates ROS effects on cardiac contractility, their effects on cardiac excitability are relatively under appreciated. Cardiac excitability depends on the functions of various cardiac sarcolemal or mitochondrial ion channels carrying various depolarizing or repolarizing currents that also maintain cellular ionic homeostasis. ROS alter the functions of these ion channels to various degrees to determine excitability by affecting the cellular resting potential and the morphology of the cardiac action potential. Thus, redox balance regulates cardiac excitability, and under pathological regulation, may alter action potential propagation to cause arrhythmia. Understanding how redox affects cellular excitability may lead to potential prophylaxis or treatment for various arrhythmias. This review will focus on the studies of redox and cardiac excitation.
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Affiliation(s)
- Nitin T Aggarwal
- Division of Cardiovascular Medicine, Department of Medicine, University of Wisconsin, Madison, WI 53792, USA
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16
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Wang X, Tao L, Hai CX. Redox-regulating role of insulin: the essence of insulin effect. Mol Cell Endocrinol 2012; 349:111-27. [PMID: 21878367 DOI: 10.1016/j.mce.2011.08.019] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Revised: 08/10/2011] [Accepted: 08/14/2011] [Indexed: 11/18/2022]
Abstract
It is well-known that insulin acts as an important hormone, controlling energy metabolism, cellular proliferation and biosynthesis of functional molecules to maintain a biological homeostasis. Over the past few years, intensive insulin therapy has been believed to be benefit for the outcome of diabetic patients, in which the suppression of oxidative stress plays a role. Moreover, insulin is accepted as a key component of glucose-insulin-potassium, a treatment which has been believed to exert significant cardiovascular protective effect via the reduction of oxidative stress. Furthermore, accumulating evidence has suggested that insulin exerts important redox-regulating actions in various insulin-sensitive target organs, implying the systematic antioxidative role of insulin as a hormone. It is time for us to revisit insulin effects, through summarizing and evaluating the novel functions of insulin and their mechanisms. This review focuses on the antioxidative effect of insulin and highlights insulin-induced regulation of various antioxidant enzymes via insulin signaling pathways and the cross talk between key transcription factors, including nuclear factor erythroid 2-related factor 2 (Nrf2) and nuclear factor κB (NF-κB) which are responsible for the transcription of antioxidant enzymes, leading to reduced generation of reactive oxygen species (ROS) and the enhancement of the elimination of ROS.
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Affiliation(s)
- Xin Wang
- Department of Toxicology, School of Preventive Medicine, The Fourth Military Medical University, Xi'an 710032, China
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17
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de Oliveira UO, Belló-Kein A, de Oliveira ÁR, Kuchaski LC, Machado UF, Irigoyen MC, Schaan BD. Insulin alone or with captopril: effects on signaling pathways (AKT and AMPK) and oxidative balance after ischemia-reperfusion in isolated hearts. Fundam Clin Pharmacol 2011; 26:679-89. [PMID: 22029532 DOI: 10.1111/j.1472-8206.2011.00995.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Insulin and the inhibition of the renin-angiotensin system have independent benefits for ischemia-reperfusion injury, but their combination has not been tested. Our aim was to evaluate the effects of insulin+captopril on insulin/angiotensin signaling pathways and cardiac function in the isolated heart subjected to ischemia-reperfusion. Isolated hearts were perfused (Langendorff technique) with Krebs-Henseleit (KH) buffer for 25 min. Global ischemia was induced (20 min), followed by reperfusion (30 min) with KH (group KH), KH+angiotensin-I (group A), KH+angiotensin-I+captopril (group AC), KH+insulin (group I), KH+insulin+angiotensin-I (group IA), or KH+insulin+angiotensin-I+captopril (group IAC). Group A had a 24% reduction in developed pressure and an increase in end-diastolic pressure vs. baseline, effects that were reverted in groups AC, IA, and IAC. The phosphorylation of protein kinase B (AKT) was higher in groups I and IA vs. groups KH and A. The phosphorylation of AMP-activated protein kinase (AMPK) was ∼31% higher in groups I, IA, and IAC vs. groups KH, A, and AC. The tert-butyl hydroperoxide (tBOOH)-induced chemiluminescence was lower (∼2.2 times) in all groups vs. group KH and was ∼35% lower in group IA vs. group A. Superoxide dismutase content was lower in groups A, AC, and IAC vs. group KH. Catalase activity was ∼28% lower in all groups (except group IA) vs. group KH. During reperfusion of the ischemic heart, insulin activates the AKT and AMPK pathways and inhibits the deleterious effects of angiotensin-I perfusion on SOD expression and cardiac function. The addition of captopril does not potentiate these effects.
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Kato T, Niizuma S, Inuzuka Y, Kawashima T, Okuda J, Tamaki Y, Iwanaga Y, Narazaki M, Matsuda T, Soga T, Kita T, Kimura T, Shioi T. Analysis of Metabolic Remodeling in Compensated Left Ventricular Hypertrophy and Heart Failure. Circ Heart Fail 2010; 3:420-30. [DOI: 10.1161/circheartfailure.109.888479] [Citation(s) in RCA: 199] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Takao Kato
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Shinichiro Niizuma
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Yasutaka Inuzuka
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Tsuneaki Kawashima
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Junji Okuda
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Yodo Tamaki
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Yoshitaka Iwanaga
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Michiko Narazaki
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Tetsuya Matsuda
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Tomoyoshi Soga
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Toru Kita
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Takeshi Kimura
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
| | - Tetsuo Shioi
- From the Department of Cardiovascular Medicine (T. Kato, S.N., Y.I., T. Kawashima, J.O., Y.T., Y.I., T. Kita, T. Kimura, T.S.), Graduate School of Medicine, and Department of Systems Science (M.N., T.M.), Graduate School of Informatics, Kyoto University, Kyoto, and Institute for Advanced Bioscience (T.S.), Keio University, Yamagata, Japan
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19
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Li S, Zheng MQ, Rozanski GJ. Glutathione homeostasis in ventricular myocytes from rat hearts with chronic myocardial infarction. Exp Physiol 2009; 94:815-24. [DOI: 10.1113/expphysiol.2008.046201] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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20
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Liang H, Li X, Li S, Zheng MQ, Rozanski GJ. Oxidoreductase regulation of Kv currents in rat ventricle. J Mol Cell Cardiol 2008; 44:1062-1071. [PMID: 18455732 PMCID: PMC2492761 DOI: 10.1016/j.yjmcc.2008.03.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2007] [Revised: 03/03/2008] [Accepted: 03/14/2008] [Indexed: 10/22/2022]
Abstract
Oxidative stress contributes to the arrhythmogenic substrate created by myocardial ischemia-reperfusion partly through a shift in cell redox state, a key modulator of protein function. The activity of many oxidation-sensitive proteins is controlled by oxidoreductase systems that regulate the redox state of cysteine thiol groups, but the impact of these systems on ion channel function is not well defined. Thus, we examined the roles of the thioredoxin and glutaredoxin systems in controlling K(+) channels in the ventricle. An oxidative shift in redox state was elicited in isolated rat ventricular myocytes by brief exposure to diamide, a thiol-specific, membrane-permeable oxidant. Voltage-clamp studies showed that diamide decreased peak outward K(+) current (I(peak)) evoked by depolarizing test pulses by 41% (+60 mV; p<0.05) while steady-state outward current (I(ss)) measured at the end of the test pulse was decreased by 45% (p<0.05). These electrophysiological effects were not prevented by protein kinase C blockers, but the tyrosine kinase inhibitors genistein or lavendustin A blocked the suppression of both K(+) currents by diamide. Moreover, inhibition of I(peak) and I(ss) by diamide was reversed by dichloroacetate and an insulin-mimetic. The effect of dichloroacetate to normalize I(peak) after diamide was blocked by the thioredoxin system inhibitors auranofin or 13-cis-retinoic acid, but I(ss) was not affected by either compound. A pan-specific inhibitor of glutaredoxin and thioredoxin systems, 1,3-bis-(2-chloroethyl)-1-nitrosourea, also blocked the dichloroacetate effect on I(peak) but only partially inhibited the recovery of I(ss). These data suggest that acute regulation of cardiac K(+) channels by oxidoreductase systems is mediated by redox-sensitive tyrosine kinase/phosphatase pathways. The pathways controlling I(peak) channels are targets of the thioredoxin system whereas those regulating I(ss) channels are likely controlled by the glutaredoxin system. Thus, cardiac oxidoreductase systems may be important regulators of ion channels affected by pathogenic oxidative stress.
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Affiliation(s)
- Huixu Liang
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Xun Li
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska, USA; Department of Cardiology, The First Affiliated Hospital, Soochow University, Suzhou, Jiangsu, P.R. China
| | - Shumin Li
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Ming-Qi Zheng
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - George J Rozanski
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska, USA; Center for Redox Biology, University of Nebraska-Lincoln, Lincoln, Nebraska, USA.
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