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Ong GJ, Nguyen TH, Surikow SY, Horowitz JD. Risk factors for a broken heart: understanding drug-induced causes for Takotsubo syndrome and pharmacological treatment options. Expert Rev Clin Pharmacol 2022; 15:1017-1025. [DOI: 10.1080/17512433.2022.2121701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Gao Jing Ong
- Cardiology Unit, Central Adelaide Local Health Network, Adelaide, Australia
- Cardiovascular Pathophysiology and Therapeutics Group, Basil Hetzel Institute, University of Adelaide, Woodville, Australia
| | - Thanh Ha Nguyen
- Cardiovascular Pathophysiology and Therapeutics Group, Basil Hetzel Institute, University of Adelaide, Woodville, Australia
- Northern Adelaide Local Health Network, Elizabeth Vale, Australia
| | - Sven Y Surikow
- Cardiovascular Pathophysiology and Therapeutics Group, Basil Hetzel Institute, University of Adelaide, Woodville, Australia
- Northern Adelaide Local Health Network, Elizabeth Vale, Australia
| | - John D Horowitz
- Cardiovascular Pathophysiology and Therapeutics Group, Basil Hetzel Institute, University of Adelaide, Woodville, Australia
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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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Salameh A, Halling M, Seidel T, Dhein S. Effects of minocycline on parameters of cardiovascular recovery after cardioplegic arrest in a rabbit Langendorff heart model. Clin Exp Pharmacol Physiol 2015; 42:1258-65. [DOI: 10.1111/1440-1681.12485] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 08/26/2015] [Accepted: 08/27/2015] [Indexed: 01/08/2023]
Affiliation(s)
- Aida Salameh
- Clinic for Pediatric Cardiology; Heart Centre; University of Leipzig; Leipzig Germany
| | - Michelle Halling
- Clinic for Cardiac Surgery; Heart Centre; University of Leipzig; Leipzig Germany
| | - Thomas Seidel
- Nora Eccles Harrison Cardiovascular Research and Training Institute; University of Utah; Salt Lake City Utah USA
| | - Stefan Dhein
- Clinic for Cardiac Surgery; Heart Centre; University of Leipzig; Leipzig Germany
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Zaman J, Jeddi S, Daneshpour MS, Zarkesh M, Daneshian Z, Ghasemi A. Ischemic postconditioning provides cardioprotective and antiapoptotic effects against ischemia–reperfusion injury through iNOS inhibition in hyperthyroid rats. Gene 2015; 570:185-90. [DOI: 10.1016/j.gene.2015.06.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Revised: 05/17/2015] [Accepted: 06/04/2015] [Indexed: 01/22/2023]
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Wang G, Wang J, Luo X, Ansari GAS, Khan MF. Nitrosative stress and nitrated proteins in trichloroethene-mediated autoimmunity. PLoS One 2014; 9:e98660. [PMID: 24892995 PMCID: PMC4043737 DOI: 10.1371/journal.pone.0098660] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 05/04/2014] [Indexed: 01/05/2023] Open
Abstract
Exposure to trichloroethene (TCE), a ubiquitous environmental contaminant, has been linked to a variety of autoimmune diseases (ADs) including SLE, scleroderma and hepatitis. Mechanisms involved in the pathogenesis of ADs are largely unknown. Earlier studies from our laboratory in MRL+/+ mice suggested the contribution of oxidative/nitrosative stress in TCE-induced autoimmunity, and N-acetylcysteine (NAC) supplementation provided protection by attenuating oxidative stress. This study was undertaken to further evaluate the contribution of nitrosative stress in TCE-mediated autoimmunity and to identify proteins susceptible to nitrosative stress. Groups of female MRL +/+ mice were given TCE, NAC or TCE + NAC for 6 weeks (TCE, 10 mmol/kg, i.p., every 4th day; NAC, ∼250 mg/kg/day via drinking water). TCE exposure led to significant increases in serum anti-nuclear and anti-histone antibodies together with significant induction of iNOS and increased formation of nitrotyrosine (NT) in sera and livers. Proteomic analysis identified 14 additional nitrated proteins in the livers of TCE-treated mice. Furthermore, TCE exposure led to decreased GSH levels and increased activation of NF-κB. Remarkably, NAC supplementation not only ameliorated TCE-induced nitrosative stress as evident from decreased iNOS, NT, nitrated proteins, NF-κB p65 activation and increased GSH levels, but also the markers of autoimmunity, as evident from decreased levels of autoantibodies in the sera. These findings provide support to the role of nitrosative stress in TCE-mediated autoimmune response and identify specific nitrated proteins which could have autoimmune potential. Attenuation of TCE-induced autoimmunity in mice by NAC provides an approach for designing therapeutic strategies.
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Affiliation(s)
- Gangduo Wang
- Department of Pathology, University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Jianling Wang
- Department of Pathology, University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Xuemei Luo
- Biomolecular Resource Facility, University of Texas Medical Branch, Galveston, Texas, United States of America
| | - G. A. Shakeel Ansari
- Department of Pathology, University of Texas Medical Branch, Galveston, Texas, United States of America
| | - M. Firoze Khan
- Department of Pathology, University of Texas Medical Branch, Galveston, Texas, United States of America
- * E-mail:
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Enhancement of cellular antioxidant-defence preserves diastolic dysfunction via regulation of both diastolic Zn2+ and Ca2+ and prevention of RyR2-leak in hyperglycemic cardiomyocytes. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2014; 2014:290381. [PMID: 24693334 PMCID: PMC3945998 DOI: 10.1155/2014/290381] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 12/17/2013] [Indexed: 01/03/2023]
Abstract
We examined whether cellular antioxidant-defence enhancement preserves diastolic dysfunction via regulation of both diastolic intracellular free Zn2+ and Ca2+ levels ([Zn2+]i and [Ca2+]i) levels N-acetyl cysteine (NAC) treatment (4 weeks) of diabetic rats preserved altered cellular redox state and also prevented diabetes-induced tissue damage and diastolic dysfunction with marked normalizations in the resting [Zn2+]i and [Ca2+]i. The kinetic parameters of transient changes in Zn2+ and Ca2+ under electrical stimulation and the spatiotemporal properties of Zn2+ and Ca2+ sparks in resting cells are found to be normal in the treated diabetic group. Biochemical analysis demonstrated that the NAC treatment also antagonized hyperphosphorylation of cardiac ryanodine receptors (RyR2) and significantly restored depleted protein levels of both RyR2 and calstabin2. Incubation of cardiomyocytes with 10 µM ZnCl2 exerted hyperphosphorylation in RyR2 as well as higher phosphorphorylations in both PKA and CaMKII in a concentration-dependent manner, similar to hyperglycemia. Our present data also showed that a subcellular oxidative stress marker, NF-κB, can be activated if the cells are exposed directly to Zn2+. We thus for the first time report that an enhancement of antioxidant defence in diabetics via directly targeting heart seems to prevent diastolic dysfunction due to modulation of RyR2 macromolecular-complex thereby leading to normalized [Ca2+]i and [Zn2+]i
in cardiomyocytes.
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Brouwers O, Niessen PMG, Miyata T, Østergaard JA, Flyvbjerg A, Peutz-Kootstra CJ, Sieber J, Mundel PH, Brownlee M, Janssen BJA, De Mey JGR, Stehouwer CDA, Schalkwijk CG. Glyoxalase-1 overexpression reduces endothelial dysfunction and attenuates early renal impairment in a rat model of diabetes. Diabetologia 2014; 57:224-35. [PMID: 24162587 DOI: 10.1007/s00125-013-3088-5] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Accepted: 10/02/2013] [Indexed: 02/02/2023]
Abstract
AIMS/HYPOTHESIS In diabetes, advanced glycation end-products (AGEs) and the AGE precursor methylglyoxal (MGO) are associated with endothelial dysfunction and the development of microvascular complications. In this study we used a rat model of diabetes, in which rats transgenically overexpressed the MGO-detoxifying enzyme glyoxalase-I (GLO-I), to determine the impact of intracellular glycation on vascular function and the development of early renal changes in diabetes. METHODS Wild-type and Glo1-overexpressing rats were rendered diabetic for a period of 24 weeks by intravenous injection of streptozotocin. Mesenteric arteries were isolated to study ex vivo vascular reactivity with a wire myograph and kidneys were processed for histological examination. Glycation was determined by mass spectrometry and immunohistochemistry. Markers for inflammation, endothelium dysfunction and renal dysfunction were measured with ELISA-based techniques. RESULTS Diabetes-induced formation of AGEs in mesenteric arteries and endothelial dysfunction were reduced by Glo1 overexpression. Despite the absence of advanced nephrotic lesions, early markers of renal dysfunction (i.e. increased glomerular volume, decreased podocyte number and diabetes-induced elevation of urinary markers albumin, osteopontin, kidney-inflammation-molecule-1 and nephrin) were attenuated by Glo1 overexpression. In line with this, downregulation of Glo1 in cultured endothelial cells resulted in increased expression of inflammation and endothelium dysfunction markers. In fully differentiated cultured podocytes incubation with MGO resulted in apoptosis. CONCLUSIONS/INTERPRETATION This study shows that effective regulation of the GLO-I enzyme is important in the prevention of vascular intracellular glycation, endothelial dysfunction and early renal impairment in experimental diabetes. Modulating the GLO-I pathway therefore may provide a novel approach to prevent vascular complications in diabetes.
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Affiliation(s)
- Olaf Brouwers
- Laboratory for Metabolism and Vascular Medicine, Division of General Internal Medicine, Department of Internal Medicine, Maastricht University Medical Center, Universiteitssingel 50, P.O. Box 616 (box 14), 6200 MD, Maastricht, the Netherlands,
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Badavi M, Abedi HA, Dianat M, Sarkaki AR. Exercise Training and Grape Seed Extract Co-Administration Improves Lipid Profile, Weight Loss, Bradycardia, and Hypotension of STZ-Induced Diabetic Rats. Int Cardiovasc Res J 2013; 7:111-7. [PMID: 24757634 PMCID: PMC3987445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 09/10/2013] [Accepted: 09/24/2013] [Indexed: 11/02/2022] Open
Abstract
BACKGROUND Exercise Training (ET) and Grape Seed Extract (GSE) as an antioxidant have many positive effects on controlling diabetes mellitus and its complications. OBJECTIVES This study aimed to determine the effects of GSE alone or combined with ET on body weight, plasma lipid profile, blood pressure, and heart rate in STZ-induced diabetic rats. METHODS IN THIS STUDY, MALE WISTAR RATS WERE RANDOMLY ASSIGNED TO FIVE GROUPS: sedentary control, sedentary diabetic, trained diabetic, GSE treated sedentary diabetic, and GSE treated trained diabetic. ET was conducted on the treadmill daily for 8 weeks. One way ANOVA followed by LSD test was used for statistical analysis. RESULTS Reduction of body weight, high density lipoproteins, heart rate, and systolic blood pressure and increment of total cholesterol, triglyceride, low density lipoprotein, and very low density lipoproteins were observed after STZ injection. Co-administration of GSE and ET had more positive effects on lipid profile compared to each method alone. In addition, GSE and ET modified heart rate partially, while their combination was more effective in improvement of heart rat in conscious rats. On the other hand, administration of ET or GSE alone did not affect systolic blood pressure and body weight, while their combination restored systolic blood pressure completely and improved body weight partially. CONCLUSIONS The study findings indicated that ET combined with GSE had more beneficial effects compared to each one alone on the complications of STZ induced diabetes. This may constitute a convenient and inexpensive therapeutic approach to diabetic complications.
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Affiliation(s)
- Mohammad Badavi
- Physiology Research Center, Physiology Department, Faculty of Medicine, Ahwaz Jundishapour University of Medical Sciences, Ahwaz, IR Iran
| | - Hassan Ali Abedi
- Physiology Department, Faculty of Medicine, Jahrom University of Medical Sciences, Jahrom, IR Iran,Corresponding author: Hassan Ali Abedi, Physiology Department, Faculty of Medicine, Jahrom University of Medical Sciences, Jahrom, IR Iran, Cellphone: +98-9177825116, Fax: +98-7914440072, E-mail:
| | - Mahin Dianat
- Physiology Research Center, Physiology Department, Faculty of Medicine, Ahwaz Jundishapour University of Medical Sciences, Ahwaz, IR Iran
| | - Ali Reza Sarkaki
- Physiology Research Center, Physiology Department, Faculty of Medicine, Ahwaz Jundishapour University of Medical Sciences, Ahwaz, IR Iran
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Wang T, Yao S, Xia Z, Irwin MG. Adiponectin: mechanisms and new therapeutic approaches for restoring diabetic heart sensitivity to ischemic post-conditioning. Front Med 2013; 7:301-5. [PMID: 23904036 DOI: 10.1007/s11684-013-0283-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Accepted: 06/03/2013] [Indexed: 12/17/2022]
Abstract
Systemic inflammatory response following myocardial ischemia-reperfusion injury (IRI) to a specific organ may cause injuries. Ischemic post-conditioning (IPostC) has emerged as a promising method for myocardial protection against IRI both in experimental and in clinical settings. Enhancement of endogenous nitric oxide (NO) is one of the major mechanisms by which IPostC confers cardioprotection. However, the sensitivity of the diabetic heart to IPostC is impaired and the underlying mechanism is unknown. Adiponectin (APN) is an adipocytederived plasma protein with anti-diabetic and anti-inflammatory properties. Plasma levels of APN are decreased in obese subjects and in patients with type 2 diabetes. APN supplementation has been shown to increase NO production and attenuate myocardial IRI in normal (non-diabetic) animals. However, the effect of APN on myocardial injury in diabetic subjects, especially its potential in restoring the sensitivity of the diabetic heart to IPostC has not been investigated. In the current paper, we discussed the possible reasons why the myocardium of diabetic subjects loses sensitivity to IPostC and also highlighted the potential effectiveness and mechanism of APN in restoring IPostC cardioprotection in diabetes. This review proposes to conduct studies that may facilitate the development of novel and optimal therapies to enhance cardioprotection in patients with severe diseases such as diabetes.
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Affiliation(s)
- Tingting Wang
- Department of Anesthesiology and Critical Care, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
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Dennis KE, Hill S, Rose KL, Sampson UKA, Hill MF. Augmented cardiac formation of oxidatively-induced carbonylated proteins accompanies the increased functional severity of post-myocardial infarction heart failure in the setting of type 1 diabetes mellitus. Cardiovasc Pathol 2013; 22:473-80. [PMID: 23566587 DOI: 10.1016/j.carpath.2013.03.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 02/28/2013] [Accepted: 03/03/2013] [Indexed: 01/25/2023] Open
Abstract
SUMMARY Heart failure (HF) is a dominant cause for the higher mortality of diabetics after myocardial infarction (MI). In the present investigation, we have discovered that higher levels of oxidative stress (OS)-induced carbonylated proteins accompany worsening post-MI HF in the presence of type 1 diabetes. These findings provide a mechanistic link between amplified OS and exacerbation of post-infarction HF in diabetes. BACKGROUND Type 1 diabetes mellitus (DM) patients surviving myocardial infarction (MI) manifest an increased incidence of subsequent heart failure (HF). We have previously shown that after MI, type 1 DM is associated with accentuated myocardial oxidative stress (OS) and concomitant worsening of left ventricular (LV) function. However, the precise mechanisms whereby type 1 DM-enhanced OS adversely affects HF after MI remain obscure. As carbonylation of proteins is an irreversible post-translational modification induced only by OS that often leads to the loss of function, we analyzed protein-bound carbonyls in the surviving LV myocardium of MI and DM+MI rats in relation to residual LV function. METHODS Type 1 DM was induced in rats via administration of streptozotocin. Two weeks after induction of type 1 DM, MI was produced in DM and non-DM rats by coronary artery ligation. Residual LV function and remodeling was assessed at 4 weeks post-MI by echocardiography. Myocardial carbonylated proteins were detected through OxyBlot analysis, and identified by mass spectrometry. RESULTS Compared with MI rats, DM+MI rats exhibited significantly poorer residual LV systolic function and elevated wet to dry weight ratios of the lungs. Protein carbonyl content in cardiac tissue and isolated heart mitochondria of DM+MI rats was 20% and 48% higher, respectively, versus MI rats. Anti-oxidative enzymes and fatty acid utilization proteins were among the carbonylated protein candidates identified. CONCLUSIONS These findings implicate myocardial protein carbonylation as part of the molecular pathophysiology of aggravated HF in the type 1 diabetic post-infarction heart.
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Affiliation(s)
- Kathleen E Dennis
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA; Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
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Odiete O, Konik EA, Sawyer DB, Hill MF. Type 1 diabetes mellitus abrogates compensatory augmentation of myocardial neuregulin-1β/ErbB in response to myocardial infarction resulting in worsening heart failure. Cardiovasc Diabetol 2013; 12:52. [PMID: 23530877 PMCID: PMC3617023 DOI: 10.1186/1475-2840-12-52] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 03/20/2013] [Indexed: 01/01/2023] Open
Abstract
Background Diabetes mellitus (DM) patients surviving myocardial infarction (MI) exhibit a substantially higher incidence of subsequent heart failure (HF). Neuregulin (NRG)-1 and erythroblastic leukemia viral oncogene homolog (ErbB) receptors have been shown to play a critical role in maintenance of cardiac function. However, whether myocardial NRG-1/ErbB is altered during post-MI HF associated with DM remains unknown. The aim of this study was to determine the impact of type 1 DM on the myocardial NRG-1/ErbB system following MI in relation to residual left ventricular (LV) function. Methods Type 1 DM was induced in rats via administration of streptozotocin (65 mg/kg, i.p.). Control rats were injected with citrate buffer (vehicle) only. Two weeks after induction of type 1 DM, MI was produced in DM and non-DM rats by ligation of the left coronary artery. Sham MI rats underwent the same surgical procedure with the exception that the left coronary artery was not ligated. At 4 weeks after surgery, residual in vivo LV function was assessed via echocardiography. Myocardial protein expression of NRG-1β, ErbB2 and ErbB4 receptors, and MDM2 (a downstream signaling pathway induced by NRG-1 that has been implicated in cell survival) was assessed in the remaining, viable LV myocardium by Western blotting. Changes in ErbB receptor localization in the surviving LV myocardium of diabetic and non-diabetic post-MI rats was determined using immunohistochemistry techniques. Results At 4 weeks post-MI, echocardiography revealed that LV fractional shortening (FS) and LV ejection fraction (EF) were significantly lower in the DM + MI group compared to the MI group (LVFS: 17.9 ± 0.7 vs. 25.2 ± 2.2; LVEF: 35.5 ± 1.4 vs. 47.5 ± 3.5, respectively; P < 0.05), indicating an increased functional severity of HF among the DM + MI rats. Up-regulation of NRG-1β and ErbB2 protein expression in the MI group was abrogated in the DM + MI group concurrent with degradation of MDM2, a downstream negative regulator of p53. ErbB2 and ErbB4 receptors re-localized to cardiac myocyte nuclei in failing type 1 diabetic post-MI hearts. Conclusions Type 1 DM prevents compensatory up-regulation of myocardial NRG-1/ErbB after MI coincident with an increased severity of HF.
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Affiliation(s)
- Oghenerukevwe Odiete
- Department of Medicine, Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
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Wang G, Li W, Lu X, Bao P, Zhao X. Luteolin ameliorates cardiac failure in type I diabetic cardiomyopathy. J Diabetes Complications 2012; 26:259-65. [PMID: 22626874 DOI: 10.1016/j.jdiacomp.2012.04.007] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Revised: 04/11/2012] [Accepted: 04/11/2012] [Indexed: 02/07/2023]
Abstract
OBJECTIVE The study aimed to determine whether luteolin can confer cardioprotective effects against diabetic cardiomyopathy in relation to specific and quantitative markers of oxidative stress. METHODS We examined diabetic cardiomyopathy by left ventricular hemodynamic analysis. Myocardial oxidative stress was assessed by measuring the activity of superoxide dismutase (SOD) as well as the level of malondialdehyde (MDA). Hypolipidaemic effects of luteolin were also investigated in STZ-induced diabetic rats. Myocardial Akt/PKB phosphorylation, heme oxygenase-1 (HO-1) and connective tissue growth factor (CTGF) protein levels were measured by Western blot in all rats at the end of the study. RESULTS This study showed a significant increase in serum triacylglycerol (TG), total cholesterol (TC), lower density lipoprotein (LDL), MDA content, creatine kinase (CK), lactate dehydrogenase (LDH), and myocardial CTGF and a significant decrease in high density lipoprotein (HDL), SOD and Akt phosphorylation level in the diabetic group compared to the control group. Luteolin treatment induced a significant decrease in serum TG, TC, LDL, MDA, CK, LDH, and myocardial CTGF and a significant increase in HDL, SOD and Akt phosphorylation levels in comparison with the diabetic group. CONCLUSION These results show that luteolin protects against the progression of diabetes mellitus-induced cardiac dysfunction by attenuation of myocardial oxidative stress probably through its antioxidant properties.
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MESH Headings
- Animals
- Antioxidants/pharmacology
- Antioxidants/therapeutic use
- Diabetes Complications/complications
- Diabetes Complications/metabolism
- Diabetes Complications/physiopathology
- Diabetes Mellitus, Experimental/chemically induced
- Diabetes Mellitus, Experimental/complications
- Diabetes Mellitus, Experimental/physiopathology
- Diabetes Mellitus, Type 1/chemically induced
- Diabetes Mellitus, Type 1/complications
- Diabetes Mellitus, Type 1/physiopathology
- Diabetic Cardiomyopathies/complications
- Diabetic Cardiomyopathies/metabolism
- Diabetic Cardiomyopathies/physiopathology
- Disease Models, Animal
- Heart Failure/physiopathology
- Heart Failure/prevention & control
- Heme Oxygenase-1/metabolism
- Luteolin/pharmacology
- Luteolin/therapeutic use
- Male
- Oxidative Stress/drug effects
- Oxidative Stress/physiology
- Rats
- Rats, Sprague-Dawley
- Streptozocin/adverse effects
- Superoxide Dismutase/metabolism
- Ventricular Dysfunction, Left/physiopathology
- Ventricular Dysfunction, Left/prevention & control
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Affiliation(s)
- Guoguang Wang
- Department of Pathophysiology, Wannan Medical College, China.
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Niwano S, Niwano H, Sasaki S, Fukaya H, Yuge M, Imaki R, Machida Y, Izumi T. N-Acetylcysteine Suppresses the Progression of Ventricular Remodeling in Acute Myocarditis - Studies in an Experimental Autoimmune Myocarditis (EAM) Model -. Circ J 2011; 75:662-71. [DOI: 10.1253/circj.cj-10-0673] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shinichi Niwano
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Hiroe Niwano
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Sae Sasaki
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Hidehira Fukaya
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Masaru Yuge
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Ryuta Imaki
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Yoji Machida
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Tohru Izumi
- Department of Cardio-Angiology, Kitasato University School of Medicine
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Mechlovich D, Amit T, Mandel SA, Bar-Am O, Bloch K, Vardi P, Youdim MBH. The Novel Multifunctional, Iron-Chelating Drugs M30 and HLA20 Protect Pancreatic β-Cell Lines from Oxidative Stress Damage. J Pharmacol Exp Ther 2010; 333:874-82. [DOI: 10.1124/jpet.109.164269] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Zhang F, Liu F, Yan M, Ji H, Hu L, Li X, Qian J, He X, Zhang L, Shen A, Cheng C. Peroxisome proliferator-activated receptor-γ agonists suppress iNOS expression induced by LPS in rat primary Schwann cells. J Neuroimmunol 2010; 218:36-47. [DOI: 10.1016/j.jneuroim.2009.10.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Revised: 10/06/2009] [Accepted: 10/22/2009] [Indexed: 10/20/2022]
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Nagareddy PR, Soliman H, Lin G, Rajput PS, Kumar U, McNeill JH, MacLeod KM. Selective inhibition of protein kinase C beta(2) attenuates inducible nitric oxide synthase-mediated cardiovascular abnormalities in streptozotocin-induced diabetic rats. Diabetes 2009; 58:2355-64. [PMID: 19587355 PMCID: PMC2750218 DOI: 10.2337/db09-0432] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Impaired cardiovascular function in diabetes is partially attributed to pathological overexpression of inducible nitric oxide synthase (iNOS) in cardiovascular tissues. We examined whether the hyperglycemia-induced increased expression of iNOS is protein kinase C-beta(2) (PKCbeta(2)) dependent and whether selective inhibition of PKCbeta reduces iNOS expression and corrects abnormal hemodynamic function in streptozotocin (STZ)-induced diabetic rats. RESEARCH DESIGN AND METHODS Cardiomyocytes and aortic vascular smooth muscle cells (VSMC) from nondiabetic rats were cultured in low (5.5 mmol/l) or high (25 mmol/l) glucose or mannitol (19.5 mmol/l mannitol + 5.5 mmol/l glucose) conditions in the presence of a selective PKCbeta inhibitor, LY333531 (20 nmol/l). Further, the in vivo effects of PKCbeta inhibition on iNOS-mediated cardiovascular abnormalities were tested in STZ-induced diabetic rats. RESULTS Exposure of cardiomyocytes to high glucose activated PKCbeta(2) and increased iNOS expression that was prevented by LY333531. Similarly, treatment of VSMC with LY333531 prevented high glucose-induced activation of nuclear factor kappaB, extracellular signal-related kinase, and iNOS overexpression. Suppression of PKCbeta(2) expression by small interference RNA decreased high-glucose-induced nuclear factor kappaB and extracellular signal-related kinase activation and iNOS expression in VSMC. Administration of LY333531 (1 mg/kg/day) decreased iNOS expression and formation of peroxynitrite in the heart and superior mesenteric arteries and corrected the cardiovascular abnormalities in STZ-induced diabetic rats, an action that was also observed with a selective iNOS inhibitor, L-NIL. CONCLUSIONS Collectively, these results suggest that inhibition of PKCbeta(2) may be a useful approach for correcting abnormal hemodynamics in diabetes by preventing iNOS mediated nitrosative stress.
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Affiliation(s)
- Prabhakara Reddy Nagareddy
- From the Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Hesham Soliman
- From the Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Guorong Lin
- From the Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Padmesh S. Rajput
- From the Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Ujendra Kumar
- From the Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
| | - John H. McNeill
- From the Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Kathleen M. MacLeod
- From the Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
- Corresponding author: Kathleen M. MacLeod,
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Nagareddy PR, McNeill JH, MacLeod KM. Chronic inhibition of inducible nitric oxide synthase ameliorates cardiovascular abnormalities in streptozotocin diabetic rats. Eur J Pharmacol 2009; 611:53-9. [PMID: 19344709 DOI: 10.1016/j.ejphar.2009.03.061] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2008] [Revised: 03/11/2009] [Accepted: 03/23/2009] [Indexed: 02/05/2023]
Abstract
Previous studies from our lab have demonstrated cardiovascular abnormalities such as depressed mean arterial blood pressure and heart rate, endothelial dysfunction and attenuated pressor responses to vasoactive agents in streptozotocin diabetic rats. We investigated whether these abnormalities are due to diabetes-associated chronic activation of inducible nitric oxide synthase (iNOS). Control and streptozotocin (60 mg/kg, iv) diabetic rats were treated with either vehicle or N6-(1-Iminoethyl)-L-lysine dihydrochloride (L-NIL, 3 mg/kg/day, p.o), a specific inhibitor of iNOS for 8 weeks. At the end of treatment, the mean arterial blood pressure and heart rate were measured in freely moving conscious rats. Further, pressor responses to bolus doses of methoxamine were determined. Endothelial nitric oxide synthase (eNOS) and iNOS expression as well as nitrotyrosine (NT) levels were assessed in the heart and superior mesenteric arteries by western blot and immunohistochemistry. Untreated diabetic rats showed depressed mean arterial blood pressure and heart rate and exhibited vascular hyporeactivity that were significantly improved by treatment with L-NIL. Further, decreased eNOS expression and increased iNOS expression and activity were associated with increased NT levels in the heart and superior mesenteric arteries of untreated diabetic rats. L-NIL treatment of diabetic rats normalized the expression of eNOS and NT levels without any effect on iNOS expression in the heart and superior mesenteric arteries. The results of our study suggest that induction of iNOS in cardiovascular tissues contributes significantly to the depressed mean arterial blood pressure, heart rate and pressor responses to vasoactive agents. Chronic inhibition of iNOS in diabetes may prove beneficial in the treatment of cardiovascular abnormalities.
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18
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Ramseyer VD, Garvin JL. Angiotensin II decreases nitric oxide synthase 3 expression via nitric oxide and superoxide in the thick ascending limb. Hypertension 2008; 53:313-8. [PMID: 19075094 DOI: 10.1161/hypertensionaha.108.124107] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
NO produced by NO synthase type 3 (NOS3) in medullary thick ascending limbs (mTHALs) inhibits Cl(-) reabsorption. Acutely, angiotensin II stimulates thick ascending limb NO production. In endothelial cells, NO inhibits NOS3 expression. Therefore, we hypothesized that angiotensin II decreases NOS3 expression via NO in mTHALs. After 24 hours, 10 and 100 nmol/L of angiotensin II decreased NOS3 expression by 23+/-9% (n=6; P<0.05) and 50+/-5% (n=7; P<0.001), respectively, in primary cultures of rat mTHALs. NO synthase inhibition by 4 mmol/L of N(G)-nitro-L-arginine methyl ester hydrochloride prevented angiotensin II from decreasing NOS3 expression (Delta=-5+/-8%; n=5). In the presence of N(G)-nitro-L-arginine methyl ester hydrochloride, the addition of exogenous NO (1 micromol/L spermine NONOate) restored the angiotensin II-induced decreases in NOS3 expression (-22+/-6%; n=7; P<0.013). In addition, NO scavenging with 10 micromol/L of carboxy-PTIO abolished the effect of angiotensin II in NOS3 expression (Delta=-1+/-8% versus carboxy-PTIO alone; n=6). Angiotensin II increases superoxide, and superoxide scavenges NO. Thus, we tested whether scavenging superoxide enhances the angiotensin II-induced reduction in NOS3 expression. Surprisingly, treatment with 100 micromol/L of Tempol, a superoxide dismutase mimetic, blocked the angiotensin II-induced decrease in NOS3 expression (Delta=-3+/-7%; n=6). This effect was not because of increased hydrogen peroxide. We concluded that angiotensin II-induced decreases in NOS3 expression in mTHALs require both NO and superoxide. Decreased NOS3 expression by angiotensin II in mTHALs could contribute to increased salt retention observed in angiotensin II-induced hypertension.
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Affiliation(s)
- Vanesa D Ramseyer
- Hypertension and Vascular Research Division, Henry Ford Hospital, 2799 West Grand Blvd, Detroit, MI 48202-2689, USA
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19
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Riad A, Westermann D, Van Linthout S, Mohr Z, Uyulmaz S, Becher PM, Rütten H, Wohlfart P, Peters H, Schultheiss HP, Tschöpe C. Enhancement of endothelial nitric oxide synthase production reverses vascular dysfunction and inflammation in the hindlimbs of a rat model of diabetes. Diabetologia 2008; 51:2325-32. [PMID: 18825362 DOI: 10.1007/s00125-008-1159-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2008] [Accepted: 07/21/2008] [Indexed: 01/28/2023]
Abstract
AIMS/HYPOTHESIS Reduced bioavailability of nitric oxide (NO) is a hallmark of diabetes mellitus-induced vascular complications. In the present study we investigated whether a pharmacological increase of endothelial NO synthase (eNOS) production can restore the impaired hindlimb flow in a rat model of severe diabetes. METHODS A model of diabetes mellitus was induced in male Sprague-Dawley rats by a single injection of streptozotozin. Rats were treated chronically with the eNOS transcription enhancer AVE3085 (10 mg [kg body weight](-1) day(-1); p.o.) or vehicle for 48 days and compared with controls. Endothelial function and arterial BP were investigated in vivo using an autoperfused hindlimb model and TIP-catheter measurement, respectively. Protein production of eNOS, total and phosphorylated vasodilator-stimulated phosphoprotein (VASP) were assessed in their quadriceps muscle tissue, whereas cyclic GMP (cGMP) concentrations were assessed in blood plasma. RNA levels of intracellular and vascular cell adhesion molecules (ICAM-1 and VCAM-1) were measured by real-time PCR. RESULTS Untreated diabetic rats showed significantly reduced quadriceps muscle contents of eNOS (-64%) and phosphorylated VASP (-26%) protein associated with impaired vascular function (maximum vasodilatation: -30%, p < 0.05) and enhanced production of ICAM-1 (+121%) and VCAM-1 (+156%). Chronic treatment with AVE3085 did not alter arterial BP or severe hyperglycaemia, but did lead to significantly increased production of eNOS (+95%), cGMP (+128%) and VASP phosphorylation (+65%) as well as to improved vascular function (+36%) associated with reduced production of ICAM-1 (-36%) and VCAM-1 (-58%). CONCLUSIONS/INTERPRETATION In a rat model of severe diabetes, pharmacological enhancement of impaired eNOS production and NO-cGMP signalling by AVE3085 restores altered hindlimb blood flow and prevents vascular inflammation.
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Affiliation(s)
- A Riad
- Department of Cardiology and Pneumology, Charité Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, 12206, Berlin, Germany
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20
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Role of mitogen-activated protein kinase cascades in inducible nitric oxide synthase expression by lipopolysaccharide in a rat Schwann cell line. Neurochem Res 2008; 34:430-7. [PMID: 18668365 DOI: 10.1007/s11064-008-9801-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2008] [Accepted: 07/01/2008] [Indexed: 12/14/2022]
Abstract
It is well known that the mitogen-activated protein kinase (MAPK) signal transduction pathways is involved in the regulation of inducible nitric oxide synthase (iNOS) in many cellular systems. However, sufficient information describing the role of MAPKs on iNOS expression in rat Schwann cells (SCs) is lacking. Therefore the paper was sought to investigate the role of MAPK cascades in iNOS expression following treatment of lipopolysaccharide (LPS) in a rat Schwann cell line RSC 96. Reverse transcriptase-PCR analysis (RT-PCR) and immunocytochemical staining were performed to detect iNOS expression following LPS induction. Next RT-PCR and Western blot analysis were employed to study expression of iNOS after using inhibitors selective for ERK (PD98059), JNK/SAPK (SP600125) and p38 (SB202190). The production of nitric oxide (NO) was measured by nitrate reductase method. LPS could significantly induce the expression of iNOS located in the cytoplasm in RSC 96 with a concentration- and time-dependent manner. Administration of inhibitors individually and combinations of the three inhibitors at micromolar concentrations suppressed the expression of iNOS and the production of NO. Based on these observations, it is proposed that LPS may activate the rat Schwann cell line RSC 96 to express iNOS and release NO via the MAPK signal transduction pathways.
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21
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Abstract
The vascular effects of glucose-intolerance were investigated using the neonatal streptozotocin-treated (nSTZ) rat model. Glucose-intolerance was initiated by administration of STZ (90 mg/kg, IP) into 2-day-old male rats. Aortic reactivity was assessed in vitro at 3 and 6 months of age. Both the 3- and 6-month-old nSTZ rats displayed higher blood glucose levels in response to a glucose challenge. At 3 months of age, aortic responsiveness to both norepinephrine and acetylcholine was not altered. However, at 6 months of age, the responses of endothelium-denuded aortas from nSTZ rats to norepinephrine and serotonin were enhanced compared to controls. Endothelium-mediated relaxation of aortas from these animals to acetylcholine was also augmented, and this effect was linked to NO release. Although norepinephrine did not elicit enhancement of aortic contraction in calcium-free medium in 6-month-old nSTZ rats, the responses to both maximum and submaximum concentrations of the agonist after readdition of calcium were greater in these tissues than in control preparations. Pretreatment of aortas with calphostin C eliminated the difference in NE-induced contraction between the control and experimental groups. Although the concentration-response curves for phorbol 12,13-dibutyrate were not different between the 2 groups, the responses of the aortas from 6-month-old nSTZ rats to a submaximum concentration of the phorbol ester were enhanced relative to controls, and this enhancement was normalized with calphostin C. Overall, the data suggest that glucose-intolerance of sufficient duration causes increases in vascular reactivity to agonists. While these findings warrant further investigations, such vascular alterations during the prediabetes stage of glucose intolerance can be a predisposing factor for the eventual development of cardiovascular complications.
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22
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Hamblin M, Smith HM, Hill MF. Dietary supplementation with vitamin E ameliorates cardiac failure in type I diabetic cardiomyopathy by suppressing myocardial generation of 8-iso-prostaglandin F2alpha and oxidized glutathione. J Card Fail 2008; 13:884-92. [PMID: 18068623 DOI: 10.1016/j.cardfail.2007.07.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2007] [Revised: 06/28/2007] [Accepted: 07/05/2007] [Indexed: 02/07/2023]
Abstract
BACKGROUND Diabetic cardiomyopathy has been documented as an underlying cause of heart failure in diabetic patients. Although oxidative stress has been implicated in diabetic cardiomyopathy, much of the current evidence lacks specificity. Furthermore, studies investigating antioxidant protection with vitamin E in this unique cardiac phenomenon have yet to be performed. In the present study, we sought to determine whether vitamin E supplementation can confer cardioprotective effects against diabetic cardiomyopathy in relation to specific and quantitative markers of myocardial oxidative stress. METHODS AND RESULTS Diabetes was induced in rats by a single injection of streptozotocin. Animals were fed either a basal diet or a diet enriched with 2000 IU of vitamin E per kilogram beginning immediately after induction of diabetes and continued for 8 weeks. Rats were examined for diabetic cardiomyopathy by left ventricular (LV) hemodynamic analysis. Myocardial oxidative stress was assessed by measuring the formation of 8-iso-prostaglandin F2alpha and oxidized glutathione. In the unsupplemented streptozotocin-diabetic rats, LV systolic pressure, rate of pressure increase (+dP/dt), and rate of pressure decay (-dP/dt) were depressed, whereas LV end-diastolic pressure was increased, indicating reduced LV contractility and slowing of LV relaxation. These hemodynamic alterations were accompanied by increased myocardial formation of 8-iso-prostaglandin F2alpha and oxidized glutathione. Vitamin E supplementation improved LV function and significantly attenuated myocardial 8-iso-prostaglandin F2alpha and oxidized glutathione accumulation in streptozotocin-diabetic rats. CONCLUSIONS These findings demonstrate the usefulness of vitamin E supplementation during the early phases of type I diabetes for the prophylaxis of cardiomyopathy and subsequent heart failure.
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Affiliation(s)
- Milton Hamblin
- Department of Biomedical Sciences, Division of Cardiovascular Biology, Meharry Medical College, Nashville, Tennessee, USA
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23
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Abebe W. Effects of taurine on the reactivity of aortas from diabetic rats. Life Sci 2008; 82:279-89. [DOI: 10.1016/j.lfs.2007.11.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2007] [Revised: 11/13/2007] [Accepted: 11/18/2007] [Indexed: 10/22/2022]
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Blouet C, Mariotti F, Mathe V, Tome D, Huneau JF. Nitric oxide bioavailability and not production is first altered during the onset of insulin resistance in sucrose-fed rats. Exp Biol Med (Maywood) 2007; 232:1458-64. [PMID: 18040070 DOI: 10.3181/0703-rm-64] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Although the role of nitric oxide (NO) in peripheral glucose uptake has been thoroughly described, little is known regarding the alterations in NO metabolism during the early onset of insulin resistance. During this study we investigated the alterations in NO synthesis and bioavailability in a model for dietary modulations of insulin sensitivity. For 6 weeks, rats were fed a standard diet (C), a high-sucrose diet inducing insulin resistance (HS), or high-sucrose diets supplemented with cysteine, which endowed protection against the high-sucrose-induced insulin resistance (Ti). Several markers of NO synthesis and bioavailability were assessed and confronted with markers of insulin sensitivity. After 5 weeks, although urinary cGMP excretion did not differ between the groups, insulin resistance in HS rats was associated with both a significant increase in NO oxidation, as determined by plasma nitrotyrosine concentrations, and in the inducible NO synthase (iNOS)/endothelial NO synthase (iNOS/eNOS) mRNA ratio in skeletal muscle compared with C rats. These alterations were prevented in rats fed the cysteine-rich diets. NO production, as assessed by urinary 15NO3* excretion following a [15N2-(guanido)]-arginine intra-venous bolus, independently and significantly correlated with insulin sensitivity but did not significantly differ between C, HS, and Ti rats; neither did the aortic eNOS protein expression or skeletal muscle insulin-induced eNOS activation. Our results indicate that in this model of dietary modulations of insulin sensitivity (i) NO production accounts for part of total inter-individual variation in insulin sensitivity, but (ii) early diet-related changes in insulin sensitivity are accompanied by changes in NO bioavailability.
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Affiliation(s)
- Clemence Blouet
- INRA, AgroParisTech, UMR914 Nutrition Physiology and Ingestive Behavior, Centre de Recherche en Nutrition Humaine-Ile de France, 75005 Paris, France
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Meghana K, Sanjeev G, Ramesh B. Curcumin prevents streptozotocin-induced islet damage by scavenging free radicals: a prophylactic and protective role. Eur J Pharmacol 2007; 577:183-91. [PMID: 17900558 DOI: 10.1016/j.ejphar.2007.09.002] [Citation(s) in RCA: 113] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2007] [Revised: 08/28/2007] [Accepted: 09/03/2007] [Indexed: 11/23/2022]
Abstract
Pancreatic islet cell death is the cause of deficient insulin production in diabetes mellitus. Approaches towards prevention of cell death are of prophylactic importance in control and management of hyperglycemia. Generation of oxidative stress is implicated in streptozotocin, a beta cell specific toxin-induced islet cell death. In this context, antioxidants raise an interest for therapeutic purposes. Curcumin, a common dietary spice is a well known antioxidant and hence we investigated its effect on streptozotocin-induced islet damage in vitro. Isolated islets from C57/BL6J mice were incubated with curcumin for 24 h and later exposed to streptozotocin for 8 h. The effect of streptozotocin exposure to islets was determined with respect to islet viability and functionality, cellular reactive oxygen species concentrations and levels of activated poly (ADP-ribose) polymerase-1. Cellular antioxidant potential (Cu/Zn superoxide dismutase) and advanced glycation end-product related damage was assessed to determine the metabolic status of treated and untreated islets. Islet viability and secreted insulin in curcumin pretreated islets were significantly higher than islets exposed to streptozotocin alone. Curcumin retarded generation of islet reactive oxygen species along with inhibition of Poly ADP-ribose polymerase-1 activation. Although curcumin did not cause overexpression of Cu/Zn superoxide dismutase, it prevented reduction in levels of cellular free radical scavenging enzymes. Our data shows that curcumin protects islets against streptozotocin-induced oxidative stress by scavenging free radicals. We show here for the first time, that prophylactic use of curcumin may effectively rescue islets from damage without affecting the normal function of these cellular structures.
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Ramana KV, Reddy ABM, Tammali R, Srivastava SK. Aldose reductase mediates endotoxin-induced production of nitric oxide and cytotoxicity in murine macrophages. Free Radic Biol Med 2007; 42:1290-302. [PMID: 17382209 PMCID: PMC1885210 DOI: 10.1016/j.freeradbiomed.2007.01.033] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2006] [Revised: 01/17/2007] [Accepted: 01/18/2007] [Indexed: 01/13/2023]
Abstract
Aldose reductase (AR) is a ubiquitously expressed protein with pleiotrophic roles as an efficient catalyst for the reduction of toxic lipid aldehydes and mediator of hyperglycemia, cytokine, and growth factor-induced redox-sensitive signals that cause secondary diabetic complications. Although AR inhibition has been shown to be protective against oxidative stress signals, the role of AR in regulating nitric oxide (NO) synthesis and NO-mediated apoptosis has not been elucidated to date. We therefore investigated the role of AR in regulating lipopolysaccharide (LPS)-induced NO synthesis and apoptosis in RAW 264.7 macrophages. Inhibition or RNA interference ablation of AR suppressed LPS-stimulated production of NO and overexpression of iNOS mRNA. Inhibition or ablation of AR also prevented the LPS-induced apoptosis, cell cycle arrest, activation of caspase-3, p38-MAPK, JNK, NF-kappaB, and AP1. In addition, AR inhibition prevented the LPS-induced down-regulation of Bcl-xl and up-regulation of Bax and Bak in macrophages. L-Arginine increased and L-NAME decreased the severity of cell death caused by LPS and AR inhibitors prevented it. Furthermore, inhibition of AR prevents cell death caused by HNE and GS-HNE, but not GS-DHN. Our findings for the first time suggest that AR-catalyzed lipid aldehyde-glutathione conjugates regulate the LPS-induced production of inflammatory marker NO and cytotoxicity in RAW 264.7 cells. Inhibition or ablation of AR activity may be a potential therapeutic target in endotoximia and other inflammatory diseases.
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Affiliation(s)
- Kota V Ramana
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX 77555, USA.
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