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Masjoan Juncos JX, Nadeem F, Shakil S, El-Husari M, Zafar I, Louch WE, Halade GV, Zaky A, Ahmad A, Ahmad S. Myocardial SERCA2 Protects Against Cardiac Damage and Dysfunction Caused by Inhaled Bromine. J Pharmacol Exp Ther 2024; 390:146-158. [PMID: 38772719 PMCID: PMC11192580 DOI: 10.1124/jpet.123.002084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 05/03/2024] [Accepted: 05/08/2024] [Indexed: 05/23/2024] Open
Abstract
Myocardial sarcoendoplasmic reticulum calcium ATPase 2 (SERCA2) activity is critical for heart function. We have demonstrated that inhaled halogen (chlorine or bromine) gases inactivate SERCA2, impair calcium homeostasis, increase proteolysis, and damage the myocardium ultimately leading to cardiac dysfunction. To further elucidate the mechanistic role of SERCA2 in halogen-induced myocardial damage, we used bromine-exposed cardiac-specific SERCA2 knockout (KO) mice [tamoxifen-administered SERCA2 (flox/flox) Tg (αMHC-MerCreMer) mice] and compared them to the oil-administered controls. We performed echocardiography and hemodynamic analysis to investigate cardiac function 24 hours after bromine (600 ppm for 30 minutes) exposure and measured cardiac injury markers in plasma and proteolytic activity in cardiac tissue and performed electron microscopy of the left ventricle (LV). Cardiac-specific SERCA2 knockout mice demonstrated enhanced toxicity to bromine. Bromine exposure increased ultrastructural damage, perturbed LV shape geometry, and demonstrated acutely increased phosphorylation of phospholamban in the KO mice. Bromine-exposed KO mice revealed significantly enhanced mean arterial pressure and sphericity index and decreased LV end diastolic diameter and LV end systolic pressure when compared with the bromine-exposed control FF mice. Strain analysis showed loss of synchronicity, evidenced by an irregular endocardial shape in systole and irregular vector orientation of contractile motion across different segments of the LV in KO mice, both at baseline and after bromine exposure. These studies underscore the critical role of myocardial SERCA2 in preserving cardiac ultrastructure and function during toxic halogen gas exposures. SIGNIFICANCE STATEMENT: Due to their increased industrial production and transportation, halogens such as chlorine and bromine pose an enhanced risk of exposure to the public. Our studies have demonstrated that inhalation of these halogens leads to the inactivation of cardiopulmonary SERCA2 and results in calcium overload. Using cardiac-specific SERCA2 KO mice, these studies further validated the role of SERCA2 in bromine-induced myocardial injury. These studies highlight the increased susceptibility of individuals with pathological loss of cardiac SERCA2 to the effects of bromine.
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Affiliation(s)
- Juan Xavier Masjoan Juncos
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
| | - Fahad Nadeem
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
| | - Shazia Shakil
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
| | - Malik El-Husari
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
| | - Iram Zafar
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
| | - William E Louch
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
| | - Ganesh V Halade
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
| | - Ahmed Zaky
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
| | - Aftab Ahmad
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
| | - Shama Ahmad
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama (J.X.M.J., F.N., S.S., M.E.-H., I.Z, A.Z., A.A., S.A.); Institute for Experimental Medical Research, Oslo University Hospital and KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway (W.E.L.); and Division of Cardiovascular Sciences, University of South Florida, Tampa, Florida (G.V.H.)
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2
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Agyapong ED, Pedriali G, Ramaccini D, Bouhamida E, Tremoli E, Giorgi C, Pinton P, Morciano G. Calcium signaling from sarcoplasmic reticulum and mitochondria contact sites in acute myocardial infarction. J Transl Med 2024; 22:552. [PMID: 38853272 PMCID: PMC11162575 DOI: 10.1186/s12967-024-05240-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 04/26/2024] [Indexed: 06/11/2024] Open
Abstract
Acute myocardial infarction (AMI) is a serious condition that occurs when part of the heart is subjected to ischemia episodes, following partial or complete occlusion of the epicardial coronary arteries. The resulting damage to heart muscle cells have a significant impact on patient's health and quality of life. About that, recent research focused on the role of the sarcoplasmic reticulum (SR) and mitochondria in the physiopathology of AMI. Moreover, SR and mitochondria get in touch each other through multiple membrane contact sites giving rise to the subcellular region called mitochondria-associated membranes (MAMs). MAMs are essential for, but not limited to, bioenergetics and cell fate. Disruption of the architecture of these regions occurs during AMI although it is still unclear the cause-consequence connection and a complete overview of the pathological changes; for sure this concurs to further damage to heart muscle. The calcium ion (Ca2+) plays a pivotal role in the pathophysiology of AMI and its dynamic signaling between the SR and mitochondria holds significant importance. In this review, we tried to summarize and update the knowledge about the roles of these organelles in AMI from a Ca2+ signaling point of view. Accordingly, we also reported some possible cardioprotective targets which are directly or indirectly related at limiting the dysfunctions caused by the deregulation of the Ca2+ signaling.
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Affiliation(s)
| | - Gaia Pedriali
- Maria Cecilia Hospital, GVM Care&Research, Cotignola, Italy
| | | | | | - Elena Tremoli
- Maria Cecilia Hospital, GVM Care&Research, Cotignola, Italy
| | - Carlotta Giorgi
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Paolo Pinton
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy.
- Maria Cecilia Hospital, GVM Care&Research, Cotignola, Italy.
| | - Giampaolo Morciano
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy.
- Maria Cecilia Hospital, GVM Care&Research, Cotignola, Italy.
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3
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Appleby S, Aitken-Buck HM, Holdaway MS, Byers MS, Frampton CM, Paton LN, Richards AM, Lamberts RR, Pemberton CJ. Cardiac effects of myoregulin in ischemia-reperfusion. Peptides 2024; 174:171156. [PMID: 38246425 DOI: 10.1016/j.peptides.2024.171156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 01/15/2024] [Accepted: 01/17/2024] [Indexed: 01/23/2024]
Abstract
Myoregulin is a recently discovered micropeptide that controls calcium levels by inhibiting the intracellular calcium pump sarco-endoplasmic reticulum Ca2+-ATPase (SERCA). Keeping calcium levels balanced in the heart is essential for normal heart functioning, thus myoregulin has the potential to be a crucial regulator of cardiac muscle performance by reducing the rate of intracellular Ca2+ uptake. We provide the first report of myoregulin mRNA expression in human heart tissue, absence of expression in human plasma, and the effects of myoregulin on cardiac hemodynamics in an ex vivo Langendorff isolated rat heart model of ischemia/reperfusion. In this preliminary study, myoregulin provided a cardio-protective effect, as assessed by preservation of left ventricular contractility and relaxation, during ischemia/reperfusion. This study provides the foundation for future research in this area.
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Affiliation(s)
- Sarah Appleby
- Christchurch Heart Institute, University of Otago, Christchurch, 2 Riccarton Avenue, Christchurch 8011, New Zealand.
| | - Hamish M Aitken-Buck
- Department of Physiology, HeartOtago, University of Otago, 270 Great King St, Dunedin 9016, New Zealand.
| | - Mark S Holdaway
- Christchurch Heart Institute, University of Otago, Christchurch, 2 Riccarton Avenue, Christchurch 8011, New Zealand.
| | - Mathew S Byers
- Christchurch Heart Institute, University of Otago, Christchurch, 2 Riccarton Avenue, Christchurch 8011, New Zealand.
| | - Chris M Frampton
- Christchurch Heart Institute, University of Otago, Christchurch, 2 Riccarton Avenue, Christchurch 8011, New Zealand.
| | - Louise N Paton
- Christchurch Heart Institute, University of Otago, Christchurch, 2 Riccarton Avenue, Christchurch 8011, New Zealand.
| | - A Mark Richards
- Christchurch Heart Institute, University of Otago, Christchurch, 2 Riccarton Avenue, Christchurch 8011, New Zealand; Department of Cardiology, Te Whatu Ora Waitaha, 2 Riccarton Avenue, Christchurch 8011, New Zealand; Cardiovascular Research Institute, National University of Singapore, 1E Kent Ridge Road, Singapore.
| | - Regis R Lamberts
- Department of Physiology, HeartOtago, University of Otago, 270 Great King St, Dunedin 9016, New Zealand.
| | - Christopher J Pemberton
- Christchurch Heart Institute, University of Otago, Christchurch, 2 Riccarton Avenue, Christchurch 8011, New Zealand.
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4
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Cortés A, Marqués J, Pejenaute Á, Ainzúa E, Ansorena E, Abizanda G, Prósper F, de Miguel C, Zalba G. Endothelial NOX5 overexpression induces changes in the cardiac gene profile: potential impact in myocardial infarction? J Physiol Biochem 2023; 79:787-797. [PMID: 37566320 PMCID: PMC10635946 DOI: 10.1007/s13105-023-00975-z] [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: 11/16/2021] [Accepted: 07/06/2023] [Indexed: 08/12/2023]
Abstract
Cardiovascular diseases and the ischemic heart disease specifically constitute the main cause of death worldwide. The ischemic heart disease may lead to myocardial infarction, which in turn triggers numerous mechanisms and pathways involved in cardiac repair and remodeling. Our goal in the present study was to characterize the effect of the NADPH oxidase 5 (NOX5) endothelial expression in healthy and infarcted knock-in mice on diverse signaling pathways. The mechanisms studied in the heart of mice were the redox pathway, metalloproteinases and collagen pathway, signaling factors such as NFκB, AKT or Bcl-2, and adhesion molecules among others. Recent studies support that NOX5 expression in animal models can modify the environment and predisposes organ response to harmful stimuli prior to pathological processes. We found many alterations in the mRNA expression of components involved in cardiac fibrosis as collagen type I or TGF-β and in key players of cardiac apoptosis such as AKT, Bcl-2, or p53. In the heart of NOX5-expressing mice after chronic myocardial infarction, gene alterations were predominant in the redox pathway (NOX2, NOX4, p22phox, or SOD1), but we also found alterations in VCAM-1 and β-MHC expression. Our results suggest that NOX5 endothelial expression in mice preconditions the heart, and we propose that NOX5 has a cardioprotective role. The correlation studies performed between echocardiographic parameters and cardiac mRNA expression supported NOX5 protective action.
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Affiliation(s)
- Adriana Cortés
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - Javier Marqués
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - Álvaro Pejenaute
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - Elena Ainzúa
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - Eduardo Ansorena
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - Gloria Abizanda
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
- Hematology Service, Clínica Universidad de Navarra, University of Navarra, Pamplona, Spain
| | - Felipe Prósper
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
- Hematology Service, Clínica Universidad de Navarra, University of Navarra, Pamplona, Spain
- CIBERONC, Madrid, Spain
| | - Carlos de Miguel
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - Guillermo Zalba
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain.
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain.
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5
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Emerging Therapy for Diabetic Cardiomyopathy: From Molecular Mechanism to Clinical Practice. Biomedicines 2023; 11:biomedicines11030662. [PMID: 36979641 PMCID: PMC10045486 DOI: 10.3390/biomedicines11030662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 02/08/2023] [Accepted: 02/11/2023] [Indexed: 02/24/2023] Open
Abstract
Diabetic cardiomyopathy is characterized by abnormal myocardial structure or performance in the absence of coronary artery disease or significant valvular heart disease in patients with diabetes mellitus. The spectrum of diabetic cardiomyopathy ranges from subtle myocardial changes to myocardial fibrosis and diastolic function and finally to symptomatic heart failure. Except for sodium–glucose transport protein 2 inhibitors and possibly bariatric and metabolic surgery, there is currently no specific treatment for this distinct disease entity in patients with diabetes. The molecular mechanism of diabetic cardiomyopathy includes impaired nutrient-sensing signaling, dysregulated autophagy, impaired mitochondrial energetics, altered fuel utilization, oxidative stress and lipid peroxidation, advanced glycation end-products, inflammation, impaired calcium homeostasis, abnormal endothelial function and nitric oxide production, aberrant epidermal growth factor receptor signaling, the activation of the renin–angiotensin–aldosterone system and sympathetic hyperactivity, and extracellular matrix accumulation and fibrosis. Here, we summarize several important emerging treatments for diabetic cardiomyopathy targeting specific molecular mechanisms, with evidence from preclinical studies and clinical trials.
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Role of Echocardiography in Diabetic Cardiomyopathy: From Mechanisms to Clinical Practice. J Cardiovasc Dev Dis 2023; 10:jcdd10020046. [PMID: 36826542 PMCID: PMC9959745 DOI: 10.3390/jcdd10020046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 01/17/2023] [Accepted: 01/25/2023] [Indexed: 01/28/2023] Open
Abstract
It has been well established that diabetes mellitus (DM) is considered as a core risk factor for the development of cardiovascular diseases. However, what is less appreciated is the fact that DM may affect cardiac function irrespective of cardiac pathologies to which it contributes, such as coronary artery disease and hypertension. Although echocardiography provides accurate and reproducible diagnostic and prognostic data in patients with DM, its use in these patients is still underappreciated, resulting in progression of DM-related heart failure in many patients. Hence, in the present review, we aimed to discuss the role of echocardiography in the contemporary management of diabetic cardiomyopathy (DCM), as well as the role of emerging echocardiographic techniques, which may contribute to earlier diagnosis and more appropriate management of this complication of DM. In order to improve outcomes, focus must be placed on early diagnosis of this condition using a combination of echocardiography and emerging biomarkers, but perhaps the more important thing is to change perspective when it comes to the clinical importance of DCM.
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Fan W, Sun X, Yang C, Wan J, Luo H, Liao B. Pacemaker activity and ion channels in the sinoatrial node cells: MicroRNAs and arrhythmia. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2023; 177:151-167. [PMID: 36450332 DOI: 10.1016/j.pbiomolbio.2022.11.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 11/13/2022] [Accepted: 11/25/2022] [Indexed: 11/29/2022]
Abstract
The primary pacemaking activity of the heart is determined by a spontaneous action potential (AP) within sinoatrial node (SAN) cells. This unique AP generation relies on two mechanisms: membrane clocks and calcium clocks. Nonhomologous arrhythmias are caused by several functional and structural changes in the myocardium. MicroRNAs (miRNAs) are essential regulators of gene expression in cardiomyocytes. These miRNAs play a vital role in regulating the stability of cardiac conduction and in the remodeling process that leads to arrhythmias. Although it remains unclear how miRNAs regulate the expression and function of ion channels in the heart, these regulatory mechanisms may support the development of emerging therapies. This study discusses the spread and generation of AP in the SAN as well as the regulation of miRNAs and individual ion channels. Arrhythmogenicity studies on ion channels will provide a research basis for miRNA modulation as a new therapeutic target.
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Affiliation(s)
- Wei Fan
- Department of Cardiovascular Surgery, Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Jiangyang District, Luzhou, Sichuan Province, 646000, China
| | - Xuemei Sun
- Department of Pharmacy, Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Jiangyang District, Luzhou, Sichuan Province, 646000, China
| | - Chao Yang
- Department of Cardiovascular Surgery, Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Jiangyang District, Luzhou, Sichuan Province, 646000, China
| | - Juyi Wan
- Department of Cardiovascular Surgery, Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Jiangyang District, Luzhou, Sichuan Province, 646000, China.
| | - Hongli Luo
- Department of Pharmacy, Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Jiangyang District, Luzhou, Sichuan Province, 646000, China.
| | - Bin Liao
- Department of Cardiovascular Surgery, Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Jiangyang District, Luzhou, Sichuan Province, 646000, China.
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8
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Prandi FR, Evangelista I, Sergi D, Palazzuoli A, Romeo F. Mechanisms of cardiac dysfunction in diabetic cardiomyopathy: molecular abnormalities and phenotypical variants. Heart Fail Rev 2022; 28:597-606. [PMID: 35001338 DOI: 10.1007/s10741-021-10200-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/01/2021] [Indexed: 12/14/2022]
Abstract
Diabetic cardiomyopathy (DCM) is a diabetes mellitus-induced pathophysiological condition characterized by cardiac structural, functional, and metabolic changes that can result in heart failure (HF), in the absence of coronary artery disease, hypertension, and valvular heart disease. Metabolic alterations such as hyperglycemia, insulin resistance, hyperinsulinemia, and increased metabolism of free fatty acids result in oxidative stress, inflammation, advanced glycation end products formation, abnormalities in calcium homeostasis, and apoptosis that are responsible for structural remodeling. Cardiac stiffness, hypertrophy, and fibrosis eventually lead to dysfunction and HF with preserved ejection fraction and/or HF with reduced ejection fraction. In this review, we analyzed in detail the cellular and molecular mechanisms and the metabolic pathways involved in the pathophysiology of DCM. Different phenotypes are observed in DCM, and it is not clear yet if the restrictive and the dilated phenotypes are distinct or represent an evolution of the same disease. Phenotypic differences can be observed between T1DM and T2DM DCM, possibly explained by the different myocardial insulin action. Further studies are needed in order to better understand the underlying mechanisms of DCM and to identify appropriate therapeutic targets and novel strategies to prevent and reverse the progression toward heart failure in diabetic patients.
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Affiliation(s)
| | - Isabella Evangelista
- Cardiovascular Diseases Unit, Department of Internal Medicine, S. Maria Alle Scotte Hospital, University of Siena, Siena, Italy
| | - Domenico Sergi
- Division of Cardiology, University Hospital "Tor Vergata", Rome, RM, Italy
| | - Alberto Palazzuoli
- Cardiovascular Diseases Unit, Department of Internal Medicine, S. Maria Alle Scotte Hospital, University of Siena, Siena, Italy
| | - Francesco Romeo
- Division of Cardiology, University Hospital "Tor Vergata", Rome, RM, Italy
- Unicamillus International University, Rome, RM, Italy
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9
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Rankovic M, Krivokapic M, Bradic J, Petkovic A, Zivkovic V, Sretenovic J, Jeremic N, Bolevich S, Kartashova M, Jeremic J, Bolevich S, Jakovljevic V, Tomovic M. New Insight Into the Cardioprotective Effects of Allium ursinum L. Extract Against Myocardial Ischemia-Reperfusion Injury. Front Physiol 2021; 12:690696. [PMID: 34393815 PMCID: PMC8361798 DOI: 10.3389/fphys.2021.690696] [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: 04/10/2021] [Accepted: 06/29/2021] [Indexed: 11/21/2022] Open
Abstract
This study aimed to estimate the effects of increasing doses of Allium ursinum methanol extract on cardiac ischemia/reperfusion injury (I/R) with a special emphasis on the role of oxidative stress. Fifty rats were randomly divided into five groups (10 animals per group) depending on the applied treatment as follows: sham, rats who drank only tap water for 28 days and hearts were retrogradely perfused for 80 min without I/R injury, I/R, rats who drank only tap water for 28 days and hearts were exposed to ex vivo I/R injury and rats who consumed increasing doses of A. ursinum 125, 250, and 500 mg/kg for 28 days before I/R injury. Hearts from all rats were isolated and retrogradely perfused according to the Langendorff technique. Parameters of oxidative stress were spectrophotometrically measured in blood, coronary venous effluent, and heart tissue samples. Intake of wild garlic extract for 28 days significantly contributed to the recovery of cardiac function, which was reflected through preserved cardiac contractility, systolic function, and coronary vasodilatory response after ischemia. Also, wild garlic extract showed the potential to modulate the systemic redox balance and stood out as a powerful antioxidant. The highest dose led to the most efficient decrease in cardiac oxidative stress and improve recovery of myocardial function after I/R injury. We might conclude that wild garlic possesses a significant role in cardioprotection and strong antioxidant activity, which implicates the possibility of its use alone in the prevention or as adjuvant antioxidant therapy in cardiovascular diseases (CVD).
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Affiliation(s)
- Marina Rankovic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Milos Krivokapic
- Faculty of Medicine, University of Montenegro, Krusevac, Montenegro
| | - Jovana Bradic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Anica Petkovic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Vladimir Zivkovic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia.,Department of Pharmacology, Sechenov First Moscow State Medical University, Moscow, Russia
| | - Jasmina Sretenovic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Nevena Jeremic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Sergey Bolevich
- Department of Human Pathology, Sechenov First Moscow State Medical University, Moscow, Russia
| | - Maria Kartashova
- Department of Human Pathology, Sechenov First Moscow State Medical University, Moscow, Russia
| | - Jovana Jeremic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Stefani Bolevich
- Department of Pathophysiology, Sechenov First Moscow State Medical University, Moscow, Russia
| | - Vladimir Jakovljevic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia.,Department of Human Pathology, Sechenov First Moscow State Medical University, Moscow, Russia
| | - Marina Tomovic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
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10
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The Mystery of Diabetic Cardiomyopathy: From Early Concepts and Underlying Mechanisms to Novel Therapeutic Possibilities. Int J Mol Sci 2021; 22:ijms22115973. [PMID: 34205870 PMCID: PMC8198766 DOI: 10.3390/ijms22115973] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 05/26/2021] [Accepted: 05/30/2021] [Indexed: 02/07/2023] Open
Abstract
Diabetic patients are predisposed to diabetic cardiomyopathy, a specific form of cardiomyopathy which is characterized by the development of myocardial fibrosis, cardiomyocyte hypertrophy, and apoptosis that develops independently of concomitant macrovascular and microvascular diabetic complications. Its pathophysiology is multifactorial and poorly understood and no specific therapeutic guideline has yet been established. Diabetic cardiomyopathy is a challenging diagnosis, made after excluding other potential entities, treated with different pharmacotherapeutic agents targeting various pathophysiological pathways that need yet to be unraveled. It has great clinical importance as diabetes is a disease with pandemic proportions. This review focuses on the potential mechanisms contributing to this entity, diagnostic options, as well as on potential therapeutic interventions taking in consideration their clinical feasibility and limitations in everyday practice. Besides conventional therapies, we discuss novel therapeutic possibilities that have not yet been translated into clinical practice.
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11
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Scheen M, Giraud R, Bendjelid K. Stress hyperglycemia, cardiac glucotoxicity, and critically ill patient outcomes current clinical and pathophysiological evidence. Physiol Rep 2021; 9:e14713. [PMID: 33463901 PMCID: PMC7814494 DOI: 10.14814/phy2.14713] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 12/09/2020] [Accepted: 12/12/2020] [Indexed: 01/07/2023] Open
Abstract
Stress hyperglycemia is a transient increase in blood glucose during acute physiological stress in the absence of glucose homeostasis dysfunction. Its's presence has been described in critically ill patients who are subject to many physiological insults. In this regard, hyperglycemia and impaired glucose tolerance are also frequent in patients who are admitted to the intensive care unit for heart failure and cardiogenic shock. The hyperglycemia observed at the beginning of these cardiac disorders appears to be related to a variety of stress mechanisms. The release of major stress and steroid hormones, catecholamine overload, and glucagon all participate in generating a state of insulin resistance with increased hepatic glucose output and glycogen breakdown. In fact, the observed pathophysiological response, which appears to regulate a stress situation, is harmful because it induces mitochondrial impairment, oxidative stress-related injury to cells, endothelial damage, and dysfunction of several cellular channels. Paradigms are now being challenged by growing evidence of a phenomenon called glucotoxicity, providing an explanation for the benefits of lowering glucose levels with insulin therapy in these patients. In the present review, the authors present the data published on cardiac glucotoxicity and discuss the benefits of lowering plasma glucose to improve heart function and to positively affect the course of critical illness.
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Affiliation(s)
- Marc Scheen
- Intensive Care Division, University Hospitals, Geneva, Switzerland.,Geneva Hemodynamic Research Group, Geneva, Switzerland.,Faculty of Medicine, Geneva, Switzerland
| | - Raphael Giraud
- Intensive Care Division, University Hospitals, Geneva, Switzerland.,Geneva Hemodynamic Research Group, Geneva, Switzerland.,Faculty of Medicine, Geneva, Switzerland
| | - Karim Bendjelid
- Intensive Care Division, University Hospitals, Geneva, Switzerland.,Geneva Hemodynamic Research Group, Geneva, Switzerland.,Faculty of Medicine, Geneva, Switzerland
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12
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Roczkowsky A, Chan BYH, Lee TYT, Mahmud Z, Hartley B, Julien O, Armanious G, Young HS, Schulz R. Myocardial MMP-2 contributes to SERCA2a proteolysis during cardiac ischaemia-reperfusion injury. Cardiovasc Res 2020; 116:1021-1031. [PMID: 31373602 DOI: 10.1093/cvr/cvz207] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 06/05/2019] [Accepted: 07/31/2019] [Indexed: 01/06/2023] Open
Abstract
AIMS Matrix metalloproteinase-2 (MMP-2) is a zinc-dependent protease which contributes to cardiac contractile dysfunction when activated during myocardial ischaemia-reperfusion (IR) injury. MMP-2 is localized to several subcellular sites inside cardiac myocytes; however, its role in the sarcoplasmic reticulum (SR) is unknown. The Ca2+ ATPase SERCA2a, which pumps cytosolic Ca2+ into the SR to facilitate muscle relaxation, is degraded in cardiac IR injury; however, the protease responsible for this is unclear. We hypothesized that MMP-2 contributes to cardiac contractile dysfunction by proteolyzing SERCA2a, thereby impairing its activity in IR injury. METHODS AND RESULTS Isolated rat hearts were subjected to IR injury in the presence or absence of the selective MMP inhibitor ARP-100, or perfused aerobically as a control. Inhibition of MMP activity with ARP-100 significantly improved the recovery of cardiac mechanical function and prevented the increase of a 70 kDa SERCA2a degradation fragment following IR injury, although 110 kDa SERCA2a and phospholamban levels appeared unchanged. Electrophoresis of IR heart samples followed by LC-MS/MS confirmed the presence of a SERCA2a fragment of ∼70 kDa. MMP-2 activity co-purified with SR-enriched microsomes prepared from the isolated rat hearts. Endogenous SERCA2a in SR-enriched microsomes was proteolyzed to ∼70 kDa products when incubated in vitro with exogenous MMP-2. MMP-2 also cleaved purified porcine SERCA2a in vitro. SERCA activity in SR-enriched microsomes was decreased by IR injury; however, this was not prevented with ARP-100. CONCLUSION This study shows that MMP-2 activity is found in SR-enriched microsomes from heart muscle and that SERCA2a is proteolyzed by MMP-2. The cardioprotective actions of MMP inhibition in myocardial IR injury may include the prevention of SERCA2a degradation.
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Affiliation(s)
- Andrej Roczkowsky
- Department of Pediatrics, University of Alberta, Mazankowski Alberta Heart Institute, 462 Heritage Medical Research Centre, Edmonton, AB T6G 2S2, Canada.,Department of Pharmacology, University of Alberta, Edmonton, AB, Canada
| | - Brandon Y H Chan
- Department of Pediatrics, University of Alberta, Mazankowski Alberta Heart Institute, 462 Heritage Medical Research Centre, Edmonton, AB T6G 2S2, Canada.,Department of Pharmacology, University of Alberta, Edmonton, AB, Canada
| | - Tim Y T Lee
- Department of Pediatrics, University of Alberta, Mazankowski Alberta Heart Institute, 462 Heritage Medical Research Centre, Edmonton, AB T6G 2S2, Canada.,Department of Pharmacology, University of Alberta, Edmonton, AB, Canada
| | - Zabed Mahmud
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Bridgette Hartley
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Olivier Julien
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Gareth Armanious
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Howard S Young
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Richard Schulz
- Department of Pediatrics, University of Alberta, Mazankowski Alberta Heart Institute, 462 Heritage Medical Research Centre, Edmonton, AB T6G 2S2, Canada.,Department of Pharmacology, University of Alberta, Edmonton, AB, Canada
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13
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Manning JR, Wijeratne AB, Oloizia BB, Zhang Y, Greis KD, Schultz JEJ. Phosphoproteomic analysis identifies phospho-Threonine-17 site of phospholamban important in low molecular weight isoform of fibroblast growth factor 2-induced protection against post-ischemic cardiac dysfunction. J Mol Cell Cardiol 2020; 148:1-14. [PMID: 32853649 DOI: 10.1016/j.yjmcc.2020.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 07/04/2020] [Accepted: 08/09/2020] [Indexed: 10/23/2022]
Abstract
RATIONALE Among its many biological roles, fibroblast growth factor 2 (FGF2) protects the heart from dysfunction and damage associated with an ischemic attack. Our laboratory demonstrated that its protection against myocardial dysfunction occurs by the low molecular weight (LMW) isoform of FGF2, while the high molecular weight (HMW) isoforms are associated with a worsening in post-ischemic recovery of cardiac function. LMW FGF2-mediated cardioprotection is facilitated by activation of multiple kinases, including PKCalpha, PKCepsilon, and ERK, and inhibition of p38 and JNK. OBJECTIVE Yet, the substrates of those kinases associated with LMW FGF2-induced cardioprotection against myocardial dysfunction remain to be elucidated. METHODS AND RESULTS To identify substrates in LMW FGF2 improvement of post-ischemic cardiac function, mouse hearts expressing only LMW FGF2 were subjected to ischemia-reperfusion (I/R) injury and analyzed by a mass spectrometry (MS)-based quantitative phosphoproteomic strategy. MS analysis identified 50 phosphorylation sites from 7 sarcoendoplasmic reticulum (SR) proteins that were significantly altered in I/R-treated hearts only expressing LMW FGF2 compared to those hearts lacking FGF2. One of those phosphorylated SR proteins identified was phospholamban (PLB), which exhibited rapid, increased phosphorylation at Threonine-17 (Thr17) after I/R in hearts expressing only LMW FGF2; this was further validated using Selected Reaction Monitoring-based MS workflow. To demonstrate a mechanistic role of phospho-Thr17 PLB in LMW FGF2-mediated cardioprotection, hearts only expressing LMW FGF2 and those expressing only LMW FGF2 with a mutant PLB lacking phosphorylatable Thr17 (Thr17Ala PLB) were subjected to I/R. Hearts only expressing LMW FGF2 showed significantly improved recovery of cardiac function following I/R (p < 0.05), and this functional improvement was significantly abrogated in hearts expressing LMW FGF2 and Thr17Ala PLB (p < 0.05). CONCLUSION The findings indicate that LMW FGF2 modulates intracellular calcium handling/cycling via regulatory changes in SR proteins essential for recovery from I/R injury, and thereby protects the heart from post-ischemic cardiac dysfunction.
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Affiliation(s)
- Janet R Manning
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, United States of America
| | - Aruna B Wijeratne
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, United States of America
| | - Brian B Oloizia
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, United States of America
| | - Yu Zhang
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, United States of America
| | - Kenneth D Greis
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, United States of America
| | - Jo El J Schultz
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, United States of America.
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14
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Adenoviral βARKct Cardiac Gene Transfer Ameliorates Postresuscitation Myocardial Injury in a Porcine Model of Cardiac Arrest. Shock 2020; 52:631-638. [PMID: 31725109 DOI: 10.1097/shk.0000000000001320] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE The aim of the study was to determine whether the inhibition of the G-protein-coupled receptor kinase 2 by adenoviral βARKct cardiac gene transfer can ameliorate postresuscitation myocardial injury in pigs with cardiac arrest (CA) and explore the mechanism of myocardial protection. METHODS Male landrace domestic pigs were randomized into the sham group (anesthetized and instrumented, but ventricular fibrillation was not induced) (n = 4), control group (ventricular fibrillation 8 min, n = 8), and βARKct group (ventricular fibrillation 8 min, n = 8). Hemodynamic parameters were monitored continuously. Blood samples were collected at baseline, 30 min, 2 h, 4 h, and 6 h after the return of spontaneous circulation (ROSC). Left ventricular ejection fraction was assessed by echocardiography at baseline and 6 h after ROSC. These animals were euthanized, and the cardiac tissue was removed for analysis at 6 h after ROSC. RESULTS Compared with those in the sham group, left ventricular +dp/dtmax, -dp/dtmax, cardiac output (CO), and ejection fraction (EF) in the control group and the βARKct group were significantly decreased at 6 h after the restoration of spontaneous circulation. However, the βARKct treatment produced better left ventricular +dp/dtmax, -dp/dtmax, CO, and EF after ROSC. The βARKct treatment also produced lower serum cardiac troponin I, CK-MB, and lactate after ROSC. Furthermore, the adenoviral βARKct gene transfer significantly increased β1 adrenergic receptors, SERCA2a, RyR2 levels, and decreased GRK2 levels compared to control. CONCLUSIONS The inhibition of GRK2 by adenoviral βARKct cardiac gene transfer can ameliorate postresuscitation myocardial injury through beneficial effects on restoring the sarcoplasmic reticulum Ca-handling proteins expression and upregulating the β1-adrenergic receptor level after cardiac arrest.
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15
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Federico M, Valverde CA, Mattiazzi A, Palomeque J. Unbalance Between Sarcoplasmic Reticulum Ca 2 + Uptake and Release: A First Step Toward Ca 2 + Triggered Arrhythmias and Cardiac Damage. Front Physiol 2020; 10:1630. [PMID: 32038301 PMCID: PMC6989610 DOI: 10.3389/fphys.2019.01630] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 12/24/2019] [Indexed: 12/19/2022] Open
Abstract
The present review focusses on the regulation and interplay of cardiac SR Ca2+ handling proteins involved in SR Ca2+ uptake and release, i.e., SERCa2/PLN and RyR2. Both RyR2 and SERCA2a/PLN are highly regulated by post-translational modifications and/or different partners' proteins. These control mechanisms guarantee a precise equilibrium between SR Ca2+ reuptake and release. The review then discusses how disruption of this balance alters SR Ca2+ handling and may constitute a first step toward cardiac damage and malignant arrhythmias. In the last part of the review, this concept is exemplified in different cardiac diseases, like prediabetic and diabetic cardiomyopathy, digitalis intoxication and ischemia-reperfusion injury.
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Affiliation(s)
- Marilén Federico
- Centro de Investigaciones Cardiovasculares "Dr. Horacio E. Cingolani", CCT-La Plata/CONICET, Facultad de Cs. Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Carlos A Valverde
- Centro de Investigaciones Cardiovasculares "Dr. Horacio E. Cingolani", CCT-La Plata/CONICET, Facultad de Cs. Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Alicia Mattiazzi
- Centro de Investigaciones Cardiovasculares "Dr. Horacio E. Cingolani", CCT-La Plata/CONICET, Facultad de Cs. Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Julieta Palomeque
- Centro de Investigaciones Cardiovasculares "Dr. Horacio E. Cingolani", CCT-La Plata/CONICET, Facultad de Cs. Médicas, Universidad Nacional de La Plata, La Plata, Argentina.,Centro de Altos Estudios en Ciencias Humanas y de la Salud, Universidad Abierta Interamericana, Buenos Aires, Argentina
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16
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The Role of Adenosine A2b Receptor in Mediating the Cardioprotection of Electroacupuncture Pretreatment via Influencing Ca 2+ Key Regulators. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 2019:6721286. [PMID: 31885657 PMCID: PMC6925712 DOI: 10.1155/2019/6721286] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 10/29/2019] [Accepted: 11/11/2019] [Indexed: 11/24/2022]
Abstract
Objective To investigate the roles played by A2b receptor and the key Ca2+ signaling components in the mediation of the cardioprotection of electroacupuncture pretreatment in the rats subjected to myocardial ischemia and reperfusion. Methods SD rats were randomly divided into a normal control (NC) group, ischemia/reperfusion model (M) group, electroacupuncture pretreatment (EA) group, and electroacupuncture pretreatment plus A2b antagonist (EAG) group. The ischemia/reperfusion model was made by ligation and loosening of the left descending branch of the coronary artery in all groups except the NC group. The EA group was pretreated with electroacupuncture at the Neiguan (PC6) point once a day for three consecutive days before the modeling. The elevation of the ST segment, arrhythmia scores, and myocardial infarction size of each group was measured. The relative expression levels of A2b, RyR2, SERCA2a, NCX1, P-PLB(S16)/PLB, and Troponin C/Troponin I proteins in the injured myocardium were detected by multiple fluorescence western blot. Results The level of ST segment, arrhythmia scores, and infarct size in the M group was significantly higher/larger than that in the NC group after ischemia and reperfusion, while all the three indices mentioned above in the EA group were significantly lower/smaller than those in the M group after reperfusion. The expression of the proteins of adenosine receptor 2b(A2b), ryanodine receptor 2(RyR2), and sarco(endo)plasmic reticulum Ca2+-ATPase 2a (SERCA2a) in the EA group was significantly enhanced as compared with the M group, while in the EAG group, the contents of A2b were significantly lower than those in the EA group, and RyR2 was higher in the EAG group. In comparison with the NC group, the relative expression of NCX1 protein in M, EA, and EAG groups was not changed significantly. The ratio of phosphorylated phospholamban (P-PLB) over phospholamban (PLB) in the M group was significantly lower than that in the NC group, and the ratio in the EA group was significantly increased as compared with the M group, while the ratio of Troponin C/Troponin I in the EA group was significantly decreased in comparison with that in other groups. Conclusion Electroacupuncture pretreatment could reduce ischemia and reperfusion-induced myocardial injury via possibly increasing the A2b content and regulating the key Ca2+ signaling components, namely inhibiting RyR2 and enhancing P-PLB(S16)/PLB ratio and SERCA2a proteins, so as to diminish the intracellular Ca2+ overload and consequently lessen the myocardial injury.
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17
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Torres MJ, McLaughlin KL, Renegar RH, Valsaraj S, Whitehurst KS, Sharaf OM, Sharma UM, Horton JL, Sarathy B, Parks JC, Brault JJ, Fisher-Wellman KH, Neufer PD, Virag JAI. Intracardiac administration of ephrinA1-Fc preserves mitochondrial bioenergetics during acute ischemia/reperfusion injury. Life Sci 2019; 239:117053. [PMID: 31733316 DOI: 10.1016/j.lfs.2019.117053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 11/06/2019] [Accepted: 11/08/2019] [Indexed: 12/18/2022]
Abstract
AIMS Intracardiac injection of recombinant EphrinA1-Fc immediately following coronary artery ligation in mice reduces infarct size in both reperfused and non-reperfused myocardium, but the cellular alterations behind this phenomenon remain unknown. MAIN METHODS Herein, 10 wk-old B6129SF2/J male mice were exposed to acute ischemia/reperfusion (30minI/24hrsR) injury immediately followed by intracardiac injection of either EphrinA1-Fc or IgG-Fc. After 24 h of reperfusion, sections of the infarct margin in the left ventricle were imaged via transmission electron microscopy, and mitochondrial function was assessed in both permeabilized fibers and isolated mitochondria, to examine mitochondrial structure, function, and energetics in the early stages of repair. KEY FINDINGS At a structural level, EphrinA1-Fc administration prevented the I/R-induced loss of sarcomere alignment and mitochondrial organization along the Z disks, as well as disorganization of the cristae and loss of inter-mitochondrial junctions. With respect to bioenergetics, loss of respiratory function induced by I/R was prevented by EphrinA1-Fc. Preservation of cardiac bioenergetics was not due to changes in mitochondrial JH2O2 emitting potential, membrane potential, ADP affinity, efficiency of ATP production, or activity of the main dehydrogenase enzymes, suggesting that EphrinA1-Fc indirectly maintains respiratory function via preservation of the mitochondrial network. Moreover, these protective effects were lost in isolated mitochondria, further emphasizing the importance of the intact cardiomyocyte ultrastructure in mitochondrial energetics. SIGNIFICANCE Collectively, these data suggest that intracardiac injection of EphrinA1-Fc protects cardiac function by preserving cardiomyocyte structure and mitochondrial bioenergetics, thus emerging as a potential therapeutic strategy in I/R injury.
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Affiliation(s)
- Maria J Torres
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, 27834, USA
| | - Kelsey L McLaughlin
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, 27834, USA; Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Randall H Renegar
- Dept of Anatomy and Cell Biology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Smrithi Valsaraj
- Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - K'Shylah S Whitehurst
- Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Omar M Sharaf
- Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Uma M Sharma
- Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Julie L Horton
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, 27834, USA; Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Brinda Sarathy
- Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Justin C Parks
- Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Jeffrey J Brault
- Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA; Dept of Kinesiology, College of Health and Human Performance, East Carolina University, Greenville, NC, 27834, USA
| | - Kelsey H Fisher-Wellman
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, 27834, USA; Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - P Darrell Neufer
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, 27834, USA; Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Jitka A I Virag
- Dept of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA.
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18
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Takesue Y, Wei FY, Fukuda H, Tanoue Y, Yamamoto T, Chujo T, Shinojima N, Yano S, Morioka M, Mukasa A, Kuratsu J, Tomizawa K. Regulation of growth hormone biosynthesis by Cdk5 regulatory subunit associated protein 1-like 1 (CDKAL1) in pituitary adenomas. Endocr J 2019; 66:807-816. [PMID: 31189758 DOI: 10.1507/endocrj.ej18-0536] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
CDK5 regulatory subunit associated protein 1-like 1 (CDKAL1) is a tRNA-modifying enzyme that catalyzes 2-methylthiolation (ms2) and has been implicated in the development of type 2 diabetes (T2D). CDKAL1-mediated ms2 is important for efficient protein translation and regulates insulin biosynthesis in pancreatic cells. Interestingly, an association between T2D and release of growth hormone (GH) has been reported in humans. However, it is unknown whether CDKAL1 is important for hormone production in the pituitary gland. The present study investigated the role of CDKAL1 in GH-producing pituitary adenomas (GHPAs). CDKAL1 activity was suppressed in GHPAs, as evidenced by a decrease in ms2, compared with non-functioning pituitary adenomas (NFPAs), which do not produce specific hormones. Downregulation of Cdkal1 using small interfering and short hairpin RNAs increased the biosynthesis and secretion of GH in rat GH3 cells. Depletion of Cdkal1 increased the cytosolic calcium level via downregulation of DnaJ heat shock protein family (Hsp40) member C10 (Dnajc10), which is an endoplasmic reticulum protein related to calcium homeostasis. This stimulated transcription of GH via upregulation of Pit-1. Moreover, CDKAL1 activity was highly sensitive to proteostatic stress and was upregulated by suppression of this stress. Taken together, these results suggest that dysregulation of CDKAL1 is involved in the pathogenesis of GHPAs, and that modulation of the proteostatic stress response might control CDKAL1 activity and facilitate treatment of GHPAs.
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Affiliation(s)
- Yoshihiro Takesue
- Department of Molecular Physiology, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
- Department of Neurosurgery, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Fan-Yan Wei
- Department of Molecular Physiology, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Hiroyuki Fukuda
- Department of Molecular Physiology, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Yuki Tanoue
- International Research Center for Medical Sciences, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Takahiro Yamamoto
- Department of Molecular Physiology, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
- Department of Neurosurgery, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Takeshi Chujo
- Department of Molecular Physiology, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Naoki Shinojima
- Department of Neurosurgery, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Shigetoshi Yano
- Department of Neurosurgery, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
- Department of Neurosurgery, Fukuoka Neurosurgical Hospital, Fukuoka 811-1313, Japan
| | - Motohiro Morioka
- Department of Neurosurgery, Kurume University School of Medicine, Fukuoka 830-0011, Japan
| | - Akitake Mukasa
- Department of Neurosurgery, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Junichi Kuratsu
- Department of Neurosurgery, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
- Department of Neurosurgery, Sakurajuji Hospital, Kumamoto 861-4173, Japan
| | - Kazuhito Tomizawa
- Department of Molecular Physiology, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
- Center for Metabolic Regulation of Healthy Aging, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
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19
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Cai B, Zhang Y, Zhao Y, Wang J, Li T, Zhang Y, Jiang Y, Jin X, Xue G, Li P, Sun Y, Huang Q, Zhang X, Su W, Yang Y, Sun Y, Shi L, Li X, Lu Y, Yang B, Pan Z. Long Noncoding RNA-DACH1 (Dachshund Homolog 1) Regulates Cardiac Function by Inhibiting SERCA2a (Sarcoplasmic Reticulum Calcium ATPase 2a). Hypertension 2019; 74:833-842. [PMID: 31446800 DOI: 10.1161/hypertensionaha.119.12998] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Heart failure (HF) is a major cause of morbidity and mortality in patients with various cardiovascular diseases. Restoration of cardiac function is critical in improving the clinical outcomes of patients with HF. Long noncoding RNAs are widely involved in the development of multiple cardiac diseases, whereas their role in regulating cardiac function remains unclear. In this study, we found that the expression of long noncoding RNA-DACH1 (dachshund homolog 1) was upregulated in the failing hearts of mice and human. We tested the hypothesis that the intronic long noncoding RNA of DACH1 (LncDACH1) can participate in the regulation of cardiac function and HF. Transgenic overexpression of LncDACH1 in the cardiac myocytes of mice led to impaired cardiac function, reduced calcium transient and cell shortening, and decreased SERCA2a (sarcoplasmic reticulum calcium ATPase 2a) protein expression. In contrast, conditional knockout of LncDACH1 in cardiac myocytes resulted in increased calcium transient, cell shortening, SERCA2a protein expression, and improved cardiac function of transverse aortic constriction induced HF mice. The same qualitative data were obtained by overexpression or knockdown of LncDACH1 with adenovirus carrying LncDACH1 or its siRNA. Moreover, therapeutic administration of adenovirus carrying LncDACH1 siRNA to transverse aortic constriction mice abolished the development of HF. Mechanistically, LncDACH1 directly binds to SERCA2a. Overexpression of LncDACH1 augments the ubiquitination of SERCA2a. LncDACH1 upregulation impairs cardiac function by promoting ubiquitination-related degradation of SERCA2a.
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Affiliation(s)
- Benzhi Cai
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China.,Department of Pharmacology, Institute of Clinical Pharmacy, Heilongjiang Key Laboratory of Drug Research (B.C.), Harbin Medical University, China
| | - Yang Zhang
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Yue Zhao
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Jin Wang
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Tingting Li
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Yiyuan Zhang
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Yuan Jiang
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Xuexin Jin
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Genlong Xue
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Penghui Li
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Yilin Sun
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Qihe Huang
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Xiaofang Zhang
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Wanzhen Su
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Ying Yang
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Yangyang Sun
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Ling Shi
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Xingda Li
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Yanjie Lu
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Baofeng Yang
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
| | - Zhenwei Pan
- From the Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy (B.C., Yang Zhang, Y. Zhao, J.W., T.L., Yiyuan Zhang, Y.J., X.J., G.X., P.L., Yilin Sun, Q.H., X.Z., W.S., Y.Y., Yangyang Sun, L.S., X.L., Y.L., B.Y., Z.P.), Harbin Medical University, China
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Abstract
Heart failure and related morbidity and mortality are increasing at an alarming rate, in large part, because of increases in aging, obesity, and diabetes mellitus. The clinical outcomes associated with heart failure are considerably worse for patients with diabetes mellitus than for those without diabetes mellitus. In people with diabetes mellitus, the presence of myocardial dysfunction in the absence of overt clinical coronary artery disease, valvular disease, and other conventional cardiovascular risk factors, such as hypertension and dyslipidemia, has led to the descriptive terminology, diabetic cardiomyopathy. The prevalence of diabetic cardiomyopathy is increasing in parallel with the increase in diabetes mellitus. Diabetic cardiomyopathy is initially characterized by myocardial fibrosis, dysfunctional remodeling, and associated diastolic dysfunction, later by systolic dysfunction, and eventually by clinical heart failure. Impaired cardiac insulin metabolic signaling, mitochondrial dysfunction, increases in oxidative stress, reduced nitric oxide bioavailability, elevations in advanced glycation end products and collagen-based cardiomyocyte and extracellular matrix stiffness, impaired mitochondrial and cardiomyocyte calcium handling, inflammation, renin-angiotensin-aldosterone system activation, cardiac autonomic neuropathy, endoplasmic reticulum stress, microvascular dysfunction, and a myriad of cardiac metabolic abnormalities have all been implicated in the development and progression of diabetic cardiomyopathy. Molecular mechanisms linked to the underlying pathophysiological changes include abnormalities in AMP-activated protein kinase, peroxisome proliferator-activated receptors, O-linked N-acetylglucosamine, protein kinase C, microRNA, and exosome pathways. The aim of this review is to provide a contemporary view of these instigators of diabetic cardiomyopathy, as well as mechanistically based strategies for the prevention and treatment of diabetic cardiomyopathy.
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Affiliation(s)
- Guanghong Jia
- From the Diabetes and Cardiovascular Research Center (G.J., J.R.S.) and Department of Medical Pharmacology and Physiology (M.A.H., J.R.S.), University of Missouri School of Medicine, Columbia; Dalton Cardiovascular Research Center, University of Missouri, Columbia (M.A.H., J.R.S.); and Research Service, Truman Memorial Veterans Hospital, Columbia, MO (G.J., J.R.S.)
| | - Michael A Hill
- From the Diabetes and Cardiovascular Research Center (G.J., J.R.S.) and Department of Medical Pharmacology and Physiology (M.A.H., J.R.S.), University of Missouri School of Medicine, Columbia; Dalton Cardiovascular Research Center, University of Missouri, Columbia (M.A.H., J.R.S.); and Research Service, Truman Memorial Veterans Hospital, Columbia, MO (G.J., J.R.S.)
| | - James R Sowers
- From the Diabetes and Cardiovascular Research Center (G.J., J.R.S.) and Department of Medical Pharmacology and Physiology (M.A.H., J.R.S.), University of Missouri School of Medicine, Columbia; Dalton Cardiovascular Research Center, University of Missouri, Columbia (M.A.H., J.R.S.); and Research Service, Truman Memorial Veterans Hospital, Columbia, MO (G.J., J.R.S.).
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21
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Afanasiev SA, Kondratieva DS, Egorova MV, Akhmedov SD, Budnikova OV, Popov SV. Features the interaction of functional and metabolic remodeling of myocardium in comorbid course of ischemic heart disease and 2 type diabetes mellitus. DIABETES MELLITUS 2019. [DOI: 10.14341/dm9735] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Background: Metabolic and structural changes in cardiomyocytes in diabetes mellitus lead to aggravation of contractile myocardial dysfunction in coronary heart disease (CHD). The contractility dysfunction of cardiomyocytes is determined by a change in the levels of sarcoplasmic reticulum (SR) Ca2+-ATPase and energetic supply of the cardiomyocytes.
Aims: To study the features of functional remodeling of the heart muscle in coronary heart disease with and without type 2 diabetes mellitus (DM2) depend on the level of Ca2+-ATPase and the activity of enzymes involved in energy metabolism.
Materials and methods: The work was performed on the heart biopsy of patients with CHD and patients with CHD combined with DM2. The inotropic reaction of myocardial strips on rest periods was assessed. The expression level of Ca2+-ATPase, the activity of enzymes succinate dehydrogenase (SDH) and lactate dehydrogenase (LDH) and the intensity of oxidative phosphorylation processes were determined.
Results: The interval-force relationship in patients with CHD with and without DM2 had both negative and positive dynamics. The positive dynamics corresponds to the "high content" of the Ca2+-ATPase and the negative dynamics corresponds to the "low content" were found. At the combined pathology the positive inotropic dynamics is more pronounced and corresponds to a higher protein level. In the patients myocardium with CHD the activity of SDH and LDH was higher, while the oxygen uptake rate by mitochondria was higher in the myocardium with combined pathology.
Conclusions: The potentiation of inotropic response of patient myocardium with CHD with and without DM2 corresponds to the "high level" of Ca2+-ATPase. In the combined pathology the inotropic capabilities of the myocardium are more expressed. In CHD the synthesis of ATP in cardiomyocytes is realized mainly due to glycolytic processes and Krebs cycle. In combined pathology the ATP synthesis is realized to a greater extent due to the oxidative phosphorylation.
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22
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Cooke CLM, Shah A, Kirschenman RD, Quon AL, Morton JS, Care AS, Davidge ST. Increased susceptibility to cardiovascular disease in offspring born from dams of advanced maternal age. J Physiol 2018; 596:5807-5821. [PMID: 29882308 DOI: 10.1113/jp275472] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 04/20/2018] [Indexed: 12/20/2022] Open
Abstract
KEY POINTS Advanced maternal age increases the risk of pregnancy complications such as fetal growth restriction, hypertension and premature birth. Offspring born from compromised pregnancies are at increased risk of cardiovascular disease as adults. However, the effect of advanced maternal age on later-onset disease in offspring has not been investigated. In adulthood, male but not female offspring born to dams of advanced maternal age showed impaired recovery from cardiac ischaemia/reperfusion injury. Endothelium-dependent relaxation was also impaired in male but not female offspring born from aged dams. Oxidative stress may play a role in the developmental programming of cardiovascular disease in this model. Given the increasing trend toward delayed parenthood, these findings have significant population and health care implications and warrant further investigation. ABSTRACT Exposure to prenatal stressors, including hypoxia, micro- and macronutrient deficiency, and maternal stress, increases the risk of cardiovascular disease in adulthood. It is unclear whether being born from a mother of advanced maternal age (≥35 years old) may also constitute a prenatal stress with cardiovascular consequences in adulthood. We previously demonstrated growth restriction in fetuses from a rat model of advanced maternal age, suggesting exposure to a compromised in utero environment. Thus, we hypothesized that male and female offspring from aged dams would exhibit impaired cardiovascular function as adults. In 4-month-old offspring, we observed impaired endothelium-dependent relaxation in male (P < 0.05) but not female offspring born from aged dams. The anti-oxidant polyethylene glycol superoxide dismutase improved relaxation only in arteries from male offspring of aged dams (ΔEmax : young dam -1.63 ± 0.80 vs. aged dam 11.75 ± 4.23, P < 0.05). Furthermore, endothelium-derived hyperpolarization-dependent relaxation was reduced in male but not female offspring of aged dams (P < 0.05). Interestingly, there was a significant increase in nitric oxide contribution to relaxation in females born from aged dams (ΔEmax : young dam -24.8 ± 12.1 vs. aged dam -68.7 ± 7.7, P < 0.05), which was not observed in males. Recovery of cardiac function following an ischaemia-reperfusion insult in male offspring born from aged dams was reduced by ∼57% (P < 0.001), an effect that was not evident in female offspring. These data indicate that offspring born from aged dams have an altered cardiovascular risk profile that is sex-specific. Given the increasing trend toward delaying pregnancy, these findings may have significant population and health care implications and warrant further investigation.
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Affiliation(s)
- Christy-Lynn M Cooke
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada.,Lois Hole Hospital for Women, Edmonton, Alberta, Canada
| | - Amin Shah
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada.,Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada
| | - Raven D Kirschenman
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada.,Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada
| | - Anita L Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada.,Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada
| | - Jude S Morton
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada.,Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada
| | - Alison S Care
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada.,Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada.,Robinson Research Institute, University of Adelaide, Adelaide, Australia
| | - Sandra T Davidge
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada.,Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada.,Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
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23
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Bidwell PA, Liu GS, Nagarajan N, Lam CK, Haghighi K, Gardner G, Cai WF, Zhao W, Mugge L, Vafiadaki E, Sanoudou D, Rubinstein J, Lebeche D, Hajjar R, Sadoshima J, Kranias EG. HAX-1 regulates SERCA2a oxidation and degradation. J Mol Cell Cardiol 2018; 114:220-233. [PMID: 29169992 PMCID: PMC5801168 DOI: 10.1016/j.yjmcc.2017.11.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 10/30/2017] [Accepted: 11/19/2017] [Indexed: 01/14/2023]
Abstract
Ischemia/reperfusion injury is associated with contractile dysfunction and increased cardiomyocyte death. Overexpression of the hematopoietic lineage substrate-1-associated protein X-1 (HAX-1) has been shown to protect from cellular injury but the function of endogenous HAX-1 remains obscure due to early lethality of the knockout mouse. Herein we generated a cardiac-specific and inducible HAX-1 deficient model, which uncovered an unexpected role of HAX-1 in regulation of sarco/endoplasmic reticulum Ca-ATPase (SERCA2a) in ischemia/reperfusion injury. Although ablation of HAX-1 in the adult heart elicited no morphological alterations under non-stress conditions, it diminished contractile recovery and increased infarct size upon ischemia/reperfusion injury. These detrimental effects were associated with increased loss of SERCA2a. Enhanced SERCA2a degradation was not due to alterations in calpain and calpastatin levels or calpain activity. Conversely, HAX-1 overexpression improved contractile recovery and maintained SERCA2a levels. The regulatory effects of HAX-1 on SERCA2a degradation were observed at multiple levels, including intact hearts, isolated cardiomyocytes and sarcoplasmic reticulum microsomes. Mechanistically, HAX-1 ablation elicited increased production of reactive oxygen species at the sarco/endoplasic reticulum compartment, resulting in SERCA2a oxidation and a predisposition to its proteolysis. This effect may be mediated by NAPDH oxidase 4 (NOX4), a novel binding partner of HAX-1. Accordingly, NOX inhibition with apocynin abrogated the effects of HAX-1 ablation in hearts subjected to ischemia/reperfusion injury. Taken together, our findings reveal a role of HAX-1 in the regulation of oxidative stress and SERCA2a degradation, implicating its importance in calcium homeostasis and cell survival pathways.
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Affiliation(s)
- Philip A Bidwell
- Department of Pharmacology and Systems Physiology, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Guan-Sheng Liu
- Department of Pharmacology and Systems Physiology, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Narayani Nagarajan
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ, USA
| | - Chi Keung Lam
- Department of Pharmacology and Systems Physiology, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Kobra Haghighi
- Department of Pharmacology and Systems Physiology, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - George Gardner
- Department of Pharmacology and Systems Physiology, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Wen-Feng Cai
- Department of Pharmacology and Systems Physiology, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Wen Zhao
- Department of Pharmacology and Systems Physiology, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Luke Mugge
- Department of Pharmacology and Systems Physiology, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Elizabeth Vafiadaki
- Molecular Biology Division, Biomedical Research Foundation, Academy of Athens, Athens, Greece
| | - Despina Sanoudou
- Molecular Biology Division, Biomedical Research Foundation, Academy of Athens, Athens, Greece; 4th Department of Internal Medicine, Attikon Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Jack Rubinstein
- Division of Cardiology, Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Djamel Lebeche
- Cardiovascular Research Center, Ichan School of Medicine at Mount Sinai, New York, NY, USA
| | - Roger Hajjar
- Cardiovascular Research Center, Ichan School of Medicine at Mount Sinai, New York, NY, USA
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ, USA
| | - Evangelia G Kranias
- Department of Pharmacology and Systems Physiology, University of Cincinnati, College of Medicine, Cincinnati, OH, USA; Molecular Biology Division, Biomedical Research Foundation, Academy of Athens, Athens, Greece.
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24
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Perez V, D'Annunzio V, Valdez LB, Zaobornyj T, Bombicino S, Mazo T, Carbajosa NL, Gironacci MM, Boveris A, Sadoshima J, Gelpi RJ. Thioredoxin-1 Attenuates Ventricular and Mitochondrial Postischemic Dysfunction in the Stunned Myocardium of Transgenic Mice. Antioxid Redox Signal 2016; 25:78-88. [PMID: 27000416 DOI: 10.1089/ars.2015.6459] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
AIM We evaluated the effect of thioredoxin1 (Trx1) system on postischemic ventricular and mitochondrial dysfunction using transgenic mice overexpressing cardiac Trx1 and a dominant negative (DN-Trx1) mutant (C32S/C35S) of Trx1. Langendorff-perfused hearts were subjected to 15 min of ischemia followed by 30 min of reperfusion (R). We measured left ventricular developed pressure (LVDP, mmHg), left ventricular end diastolic pressure (LVEDP, mmHg), and t63 (relaxation index, msec). Mitochondrial respiration, SERCA2a, phospholamban (PLB), and phospholamban phosphorylation (p-PLB) Thr17 expression (Western blot) were also evaluated. RESULTS At 30 min of reperfusion, Trx1 improved contractile state (LVDP: Trx1: 57.4 ± 4.9 vs. Wt: 27.1 ± 6.3 and DN-Trx1: 29.2 ± 7.1, p < 0.05); decreased myocardial stiffness (LVEDP: Wt: 24.5 ± 4.8 vs. Trx1: 11.8 ± 2.9, p < 0.05); and improved the isovolumic relaxation (t63: Wt: 63.3 ± 3.2 vs. Trx1: 51.4 ± 1.9, p < 0.05). DN-Trx1 mice aggravated the myocardial stiffness and isovolumic relaxation. Only the expression of p-PLB Thr17 increased at 1.5 min R in Wt and DN-Trx1 groups. At 30 min of reperfusion, state 3 mitochondrial O2 consumption was impaired by 13% in Wt and by 33% in DN-Trx1. ADP/O ratios for Wt and DN-Trx1 decrease by 25% and 28%, respectively; whereas the Trx1 does not change after ischemia and reperfusion (I/R). Interestingly, baseline values of complex I activity were increased in Trx1 mice; they were 24% and 47% higher than in Wt and DN-Trx1 mice, respectively (p < 0.01). INNOVATION AND CONCLUSION These results strongly suggest that Trx1 ameliorates the myocardial effects of I/R by improving the free radical-mediated damage in cardiac and mitochondrial function, opening the possibility of new therapeutic strategies in coronary artery disease. Antioxid. Redox Signal. 25, 78-88.
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Affiliation(s)
- Virginia Perez
- 1 Institute of Biochemistry and Molecular Medicine (IBIMOL , UBA-CONICET), Buenos Aires, Argentina .,2 Department of Pathology, Faculty of Medicine, Institute of Cardiovascular Physiopathology, University of Buenos Aires , Buenos Aires, Argentina
| | - Veronica D'Annunzio
- 1 Institute of Biochemistry and Molecular Medicine (IBIMOL , UBA-CONICET), Buenos Aires, Argentina .,2 Department of Pathology, Faculty of Medicine, Institute of Cardiovascular Physiopathology, University of Buenos Aires , Buenos Aires, Argentina
| | - Laura B Valdez
- 1 Institute of Biochemistry and Molecular Medicine (IBIMOL , UBA-CONICET), Buenos Aires, Argentina .,3 School of Pharmacy and Biochemistry, University of Buenos Aires , Buenos Aires, Argentina
| | - Tamara Zaobornyj
- 1 Institute of Biochemistry and Molecular Medicine (IBIMOL , UBA-CONICET), Buenos Aires, Argentina .,3 School of Pharmacy and Biochemistry, University of Buenos Aires , Buenos Aires, Argentina
| | - Silvina Bombicino
- 1 Institute of Biochemistry and Molecular Medicine (IBIMOL , UBA-CONICET), Buenos Aires, Argentina .,3 School of Pharmacy and Biochemistry, University of Buenos Aires , Buenos Aires, Argentina
| | - Tamara Mazo
- 1 Institute of Biochemistry and Molecular Medicine (IBIMOL , UBA-CONICET), Buenos Aires, Argentina .,2 Department of Pathology, Faculty of Medicine, Institute of Cardiovascular Physiopathology, University of Buenos Aires , Buenos Aires, Argentina
| | - Nadia Longo Carbajosa
- 4 Department of Biological Chemistry and IQUIFIB, School of Pharmacy and Biochemistry, University of Buenos Aires , Buenos Aires, Argentina
| | - Mariela M Gironacci
- 4 Department of Biological Chemistry and IQUIFIB, School of Pharmacy and Biochemistry, University of Buenos Aires , Buenos Aires, Argentina
| | - Alberto Boveris
- 1 Institute of Biochemistry and Molecular Medicine (IBIMOL , UBA-CONICET), Buenos Aires, Argentina .,3 School of Pharmacy and Biochemistry, University of Buenos Aires , Buenos Aires, Argentina
| | - Junichi Sadoshima
- 5 Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers University , Newark, New Jersey
| | - Ricardo J Gelpi
- 1 Institute of Biochemistry and Molecular Medicine (IBIMOL , UBA-CONICET), Buenos Aires, Argentina .,2 Department of Pathology, Faculty of Medicine, Institute of Cardiovascular Physiopathology, University of Buenos Aires , Buenos Aires, Argentina
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25
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Yang S, Xu W, Dong Z, Zhou M, Lin C, Jin H, Su Y, Li Q, Wang X, Chang H, Han W. TPEN prevents rapid pacing-induced calcium overload and nitration stress in HL-1 myocytes. Cardiovasc Ther 2016; 33:200-8. [PMID: 25973665 DOI: 10.1111/1755-5922.12134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
INTRODUCTION Atrial fibrillation (AF) is the most common cardiac arrhythmia. However, the current drug interference of antiarrhythmia has limited efficacy and off-target effects. Accumulating evidence has implicated a potential role of nitration stress in the pathogenesis of AF. The aim of the study was to determine whether TPEN provided antinitration effects on atrial myocytes during AF, especially under circumstances of nitration stress. METHODS We utilized a rapid paced HL-1 cells model for AF. The changes of electrophysiological characteristics and structure of paced HL-1 cells were determined by a patch clamp and a TEM method. The effects of TPEN on pacing and ONOO(-) pretreated HL-1 cells were examined using MTT assay, TUNEL technique, confocal microscope experiment, and Western blot analysis. RESULTS The results revealed that ONOO(-) reduced the viability of HL-1 cells in a dose-dependent manner, and 1 μmol/L TPEN significantly ameliorated the damage caused by 50 μmol/L ONOO(-) (P < 0.05). Pacing and/or ONOO(-) -induced marked shortening of APD, myolysis, and nuclear condensation. TPEN inhibited the Ca(2+) overload induced by rapid pacing (P < 0.05) and ONOO(-) stimulation (P < 0.05). The application of TPEN significantly prevented the protein nitration caused by pacing or pacing plus ONOO(-) (P < 0.05). Additionally, pacing in combination with ONOO(-) treatment led to increase in apoptosis in HL-1 cells (P < 0.01), which could be reduced by pretreatment with TPEN (P < 0.05). CONCLUSIONS TPEN prevents Ca(2+) overload and nitration stress in HL-1 atrial myocytes during rapid pacing and circumstances of nitration stress.
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Affiliation(s)
- Shusen Yang
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Wenjing Xu
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Zengxiang Dong
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Mo Zhou
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Chaolan Lin
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Hongbo Jin
- Laboratory of Physiology, Harbin Medical University, Harbin, China
| | - Yafen Su
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Qingyu Li
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Xu Wang
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Huiying Chang
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Wei Han
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
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Cardenas H, Arango D, Nicholas C, Duarte S, Nuovo GJ, He W, Voss OH, Gonzalez-Mejia ME, Guttridge DC, Grotewold E, Doseff AI. Dietary Apigenin Exerts Immune-Regulatory Activity in Vivo by Reducing NF-κB Activity, Halting Leukocyte Infiltration and Restoring Normal Metabolic Function. Int J Mol Sci 2016; 17:323. [PMID: 26938530 PMCID: PMC4813185 DOI: 10.3390/ijms17030323] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 02/16/2016] [Accepted: 02/16/2016] [Indexed: 12/31/2022] Open
Abstract
The increasing prevalence of inflammatory diseases and the adverse effects associated with the long-term use of current anti-inflammatory therapies prompt the identification of alternative approaches to reestablish immune balance. Apigenin, an abundant dietary flavonoid, is emerging as a potential regulator of inflammation. Here, we show that apigenin has immune-regulatory activity in vivo. Apigenin conferred survival to mice treated with a lethal dose of Lipopolysaccharide (LPS) restoring normal cardiac function and heart mitochondrial Complex I activity. Despite the adverse effects associated with high levels of splenocyte apoptosis in septic models, apigenin had no effect on reducing cell death. However, we found that apigenin decreased LPS-induced apoptosis in lungs, infiltration of inflammatory cells and chemotactic factors’ accumulation, re-establishing normal lung architecture. Using NF-κB luciferase transgenic mice, we found that apigenin effectively modulated NF-κB activity in the lungs, suggesting the ability of dietary compounds to exert immune-regulatory activity in an organ-specific manner. Collectively, these findings provide novel insights into the underlying immune-regulatory mechanisms of dietary nutraceuticals in vivo.
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Affiliation(s)
- Horacio Cardenas
- Department of Physiology and Cell Biology, the Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA.
- Department of Molecular Genetics, the Ohio State University, Columbus, OH 43210, USA.
| | - Daniel Arango
- Department of Physiology and Cell Biology, the Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA.
- Department of Molecular Genetics, the Ohio State University, Columbus, OH 43210, USA.
- Molecular Cellular and Developmental Biology Graduate Program, the Ohio State University, Columbus, OH 43210, USA.
| | - Courtney Nicholas
- Department of Physiology and Cell Biology, the Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA.
- Department of Molecular Genetics, the Ohio State University, Columbus, OH 43210, USA.
- Molecular Cellular and Developmental Biology Graduate Program, the Ohio State University, Columbus, OH 43210, USA.
| | - Silvia Duarte
- Department of Physiology and Cell Biology, the Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA.
- Department of Molecular Genetics, the Ohio State University, Columbus, OH 43210, USA.
- Nutrition Graduate Program, the Ohio State University, Columbus, OH 43210, USA.
| | - Gerard J Nuovo
- Comprehensive Cancer Center, the Ohio State University, Columbus, OH 43210, USA.
| | - Wei He
- Molecular Cellular and Developmental Biology Graduate Program, the Ohio State University, Columbus, OH 43210, USA.
- Comprehensive Cancer Center, the Ohio State University, Columbus, OH 43210, USA.
| | - Oliver H Voss
- Department of Molecular Genetics, the Ohio State University, Columbus, OH 43210, USA.
| | - M Elba Gonzalez-Mejia
- Department of Physiology and Cell Biology, the Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA.
- Department of Molecular Genetics, the Ohio State University, Columbus, OH 43210, USA.
| | - Denis C Guttridge
- Comprehensive Cancer Center, the Ohio State University, Columbus, OH 43210, USA.
| | - Erich Grotewold
- Department of Molecular Genetics, the Ohio State University, Columbus, OH 43210, USA.
- Center for Applied Plant Sciences, the Ohio State University, Columbus, OH 43210, USA.
| | - Andrea I Doseff
- Department of Physiology and Cell Biology, the Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA.
- Department of Molecular Genetics, the Ohio State University, Columbus, OH 43210, USA.
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Luteolin Exerts Cardioprotective Effects through Improving Sarcoplasmic Reticulum Ca(2+)-ATPase Activity in Rats during Ischemia/Reperfusion In Vivo. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2015; 2015:365854. [PMID: 26681967 PMCID: PMC4670634 DOI: 10.1155/2015/365854] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 10/06/2015] [Accepted: 10/12/2015] [Indexed: 12/04/2022]
Abstract
The flavonoid luteolin exists in many types of fruits, vegetables, and medicinal herbs. Our previous studies have demonstrated that luteolin reduced ischemia/reperfusion (I/R) injury in vitro, which was related with sarcoplasmic reticulum Ca2+-ATPase (SERCA2a) activity. However, the effects of luteolin on SERCA2a activity during I/R in vivo remain unclear. To investigate whether luteolin exerts cardioprotective effects and to monitor changes in SERCA2a expression and activity levels in vivo during I/R, we created a myocardial I/R rat model by ligating the coronary artery. We demonstrated that luteolin could reduce the myocardial infarct size, lactate dehydrogenase release, and apoptosis during I/R injury in vivo. Furthermore, we found that luteolin inhibited the I/R-induced decrease in SERCA2a activity in vivo. However, neither I/R nor luteolin altered SERCA2a expression levels in myocardiocytes. Moreover, the PI3K/Akt signaling pathway played a vital role in this mechanism. In conclusion, the present study has confirmed for the first time that luteolin yields cardioprotective effects against I/R injury by inhibiting the I/R-induced decrease in SERCA2a activity partially via the PI3K/Akt signaling pathway in vivo, independent of SERCA2a protein level regulation. SERCA2a activity presents a novel biomarker to assess the progress of I/R injury in experimental research and clinical applications.
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Reyes LA, Boslett J, Varadharaj S, De Pascali F, Hemann C, Druhan LJ, Ambrosio G, El-Mahdy M, Zweier JL. Depletion of NADP(H) due to CD38 activation triggers endothelial dysfunction in the postischemic heart. Proc Natl Acad Sci U S A 2015; 112:11648-53. [PMID: 26297248 PMCID: PMC4577172 DOI: 10.1073/pnas.1505556112] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In the postischemic heart, coronary vasodilation is impaired due to loss of endothelial nitric oxide synthase (eNOS) function. Although the eNOS cofactor tetrahydrobiopterin (BH4) is depleted, its repletion only partially restores eNOS-mediated coronary vasodilation, indicating that other critical factors trigger endothelial dysfunction. Therefore, studies were performed to characterize the unidentified factor(s) that trigger endothelial dysfunction in the postischemic heart. We observed that depletion of the eNOS substrate NADPH occurs in the postischemic heart with near total depletion from the endothelium, triggering impaired eNOS function and limiting BH4 rescue through NADPH-dependent salvage pathways. In isolated rat hearts subjected to 30 min of ischemia and reperfusion (I/R), depletion of the NADP(H) pool occurred and was most marked in the endothelium, with >85% depletion. Repletion of NADPH after I/R increased NOS-dependent coronary flow well above that with BH4 alone. With combined NADPH and BH4 repletion, full restoration of NOS-dependent coronary flow occurred. Profound endothelial NADPH depletion was identified to be due to marked activation of the NAD(P)ase-activity of CD38 and could be prevented by inhibition or specific knockdown of this protein. Depletion of the NADPH precursor, NADP(+), coincided with formation of 2'-phospho-ADP ribose, a CD38-derived signaling molecule. Inhibition of CD38 prevented NADP(H) depletion and preserved endothelium-dependent relaxation and NO generation with increased recovery of contractile function and decreased infarction in the postischemic heart. Thus, CD38 activation is an important cause of postischemic endothelial dysfunction and presents a novel therapeutic target for prevention of this dysfunction in unstable coronary syndromes.
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Affiliation(s)
- Levy A Reyes
- Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University Medical Center, Columbus, OH 43210
| | - James Boslett
- Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University Medical Center, Columbus, OH 43210
| | - Saradhadevi Varadharaj
- Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University Medical Center, Columbus, OH 43210
| | - Francesco De Pascali
- Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University Medical Center, Columbus, OH 43210
| | - Craig Hemann
- Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University Medical Center, Columbus, OH 43210
| | - Lawrence J Druhan
- Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University Medical Center, Columbus, OH 43210
| | - Giuseppe Ambrosio
- Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University Medical Center, Columbus, OH 43210; Division of Cardiology, University of Perugia School of Medicine, 06156 Perugia, Italy
| | - Mohamed El-Mahdy
- Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University Medical Center, Columbus, OH 43210
| | - Jay L Zweier
- Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University Medical Center, Columbus, OH 43210;
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Mattiazzi A, Bassani RA, Escobar AL, Palomeque J, Valverde CA, Vila Petroff M, Bers DM. Chasing cardiac physiology and pathology down the CaMKII cascade. Am J Physiol Heart Circ Physiol 2015; 308:H1177-91. [PMID: 25747749 DOI: 10.1152/ajpheart.00007.2015] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 02/16/2015] [Indexed: 11/22/2022]
Abstract
Calcium dynamics is central in cardiac physiology, as the key event leading to the excitation-contraction coupling (ECC) and relaxation processes. The primary function of Ca(2+) in the heart is the control of mechanical activity developed by the myofibril contractile apparatus. This key role of Ca(2+) signaling explains the subtle and critical control of important events of ECC and relaxation, such as Ca(2+) influx and SR Ca(2+) release and uptake. The multifunctional Ca(2+)-calmodulin-dependent protein kinase II (CaMKII) is a signaling molecule that regulates a diverse array of proteins involved not only in ECC and relaxation but also in cell death, transcriptional activation of hypertrophy, inflammation, and arrhythmias. CaMKII activity is triggered by an increase in intracellular Ca(2+) levels. This activity can be sustained, creating molecular memory after the decline in Ca(2+) concentration, by autophosphorylation of the enzyme, as well as by oxidation, glycosylation, and nitrosylation at different sites of the regulatory domain of the kinase. CaMKII activity is enhanced in several cardiac diseases, altering the signaling pathways by which CaMKII regulates the different fundamental proteins involved in functional and transcriptional cardiac processes. Dysregulation of these pathways constitutes a central mechanism of various cardiac disease phenomena, like apoptosis and necrosis during ischemia/reperfusion injury, digitalis exposure, post-acidosis and heart failure arrhythmias, or cardiac hypertrophy. Here we summarize significant aspects of the molecular physiology of CaMKII and provide a conceptual framework for understanding the role of the CaMKII cascade on Ca(2+) regulation and dysregulation in cardiac health and disease.
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Affiliation(s)
- Alicia Mattiazzi
- Centro de Investigaciones Cardiovasculares, The National Scientific and Technical Research Council-La Plata, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina;
| | - Rosana A Bassani
- Centro de Engenharia Biomédica, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Ariel L Escobar
- Biological Engineering and Small Scale Technologies, School of Engineering, University of California, Merced, California; and
| | - Julieta Palomeque
- Centro de Investigaciones Cardiovasculares, The National Scientific and Technical Research Council-La Plata, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Carlos A Valverde
- Centro de Investigaciones Cardiovasculares, The National Scientific and Technical Research Council-La Plata, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Martín Vila Petroff
- Centro de Investigaciones Cardiovasculares, The National Scientific and Technical Research Council-La Plata, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Donald M Bers
- Department of Pharmacology, University of California Davis, Davis, California
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Blackmore HL, Niu Y, Fernandez-Twinn DS, Tarry-Adkins JL, Giussani DA, Ozanne SE. Maternal diet-induced obesity programs cardiovascular dysfunction in adult male mouse offspring independent of current body weight. Endocrinology 2014; 155:3970-80. [PMID: 25051449 PMCID: PMC4255219 DOI: 10.1210/en.2014-1383] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Obese pregnancies are not only associated with adverse consequences for the mother but also the long-term health of her child. Human studies have shown that individuals from obese mothers are at increased risk of premature death from cardiovascular disease (CVD), but are unable to define causality. This study aimed to determine causality using a mouse model of maternal diet-induced obesity. Obesity was induced in female C57BL/6 mice by feeding a diet rich in simple sugars and saturated fat 6 weeks prior to pregnancy and throughout pregnancy and lactation. Control females were fed laboratory chow. Male offspring from both groups were weaned onto chow and studied at 3, 5, 8, and 12 weeks of age for gross cardiac morphometry using stereology, cardiomyocyte cell area by histology, and cardiac fetal gene expression using qRT-PCR. Cardiac function was assessed by isolated Langendorff technology at 12 weeks of age and hearts were analyzed at the protein level for the expression of the β1 adrenergic receptor, muscarinic type-2 acetylcholine receptor, and proteins involved in cardiac contraction. Offspring from obese mothers develop pathologic cardiac hypertrophy associated with re-expression of cardiac fetal genes. By young adulthood these offspring developed severe systolic and diastolic dysfunction and cardiac sympathetic dominance. Importantly, cardiac dysfunction occurred in the absence of any change in corresponding body weight and despite the offspring eating a healthy low-fat diet. These findings provide a causal link to explain human observations relating maternal obesity with premature death from CVD in her offspring.
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Affiliation(s)
- Heather L Blackmore
- University of Cambridge, Metabolic Research Laboratories and MRC Metabolic Diseases Unit, Wellcome Trust-MRC Institute of Metabolic Science (H.L.B., D.S.F.-T., J.L.T.-A., S.E.O.), Addenbrookes Hospital, Cambridge CB2 0QQ, United Kingdom; and Department of Physiology, Development, and Neuroscience (Y.N., D.A.G.), University of Cambridge, Cambridge CB2 3EG, United Kingdom
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Yan W, Zhang F, Zhang R, Zhang X, Wang Y, Zhou F, Xia Y, Liu P, Gao C, Wang H, Zhang L, Zhou J, Gao F, Gao E, Koch WJ, Wang H, Cheng H, Qu Y, Tao L. Adiponectin regulates SR Ca(2+) cycling following ischemia/reperfusion via sphingosine 1-phosphate-CaMKII signaling in mice. J Mol Cell Cardiol 2014; 74:183-92. [PMID: 24852843 DOI: 10.1016/j.yjmcc.2014.05.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 04/15/2014] [Accepted: 05/08/2014] [Indexed: 01/01/2023]
Abstract
The adipocyte-secreted hormone adiponectin (APN) exerts protective effects on the heart under stress conditions. Recent studies have demonstrated that APN induces a marked Ca(2+) influx in skeletal muscle. However, whether APN modulates [Ca(2+)]i activity, especially [Ca(2+)]i transients in cardiomyocytes, is still unknown. This study was designed to determine whether APN modulates [Ca(2+)]i transients in cardiomyocytes. Adult male wild-type (WT) and APN knockout (APN KO) mice were subjected to myocardial ischemia/reperfusion (I/R, 30min/30min) injury. CaMKII-PLB phosphorylation and SR Ca(2+)-ATPase (SERCA2) activity were downregulated in I/R hearts of WT mice and further decreased in those of APN KO mice. Both the globular domain of APN and full-length APN significantly reversed the decrease in CaMKII-PLB phosphorylation and SERCA2 activity in WT and APN KO mice. Interestingly, compared with WT littermates, single myocytes isolated from APN KO mice had remarkably decreased [Ca(2+)]i transients, cell shortening, and a prolonged Ca(2+) decay rate. Further examination revealed that APN enhances SERCA2 activity via CaMKII-PLB signaling. In in vivo and in vitro experiments, both APN receptor 1/2 and S1P were necessary for the APN-stimulated CaMKII-PLB-SERCA2 activation. In addition, S1P activated CaMKII-PLB signaling in neonatal cardiomyocytes in a dose dependent manner and improved [Ca(2+)]i transients in APN KO myocytes via the S1P receptor (S1PR1/3). Further in vivo experiments revealed that pharmacological inhibition of S1PR1/3 and SERCA2 siRNA suppressed APN-mediated cardioprotection during I/R. These data demonstrate that S1P is a novel regulator of SERCA2 that activates CaMKII-PLB signaling and mediates APN-induced cardioprotection.
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Affiliation(s)
- Wenjun Yan
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Fuyang Zhang
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Ronghuai Zhang
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Xing Zhang
- Department of Physiology, School of Basic Medical Sciences, Fourth Military Medical University, Xi'an 710032, China
| | - Yanru Wang
- Institutes of Molecular Medicine, Peking University, Beijing 100083, China
| | - Fen Zhou
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Yunlong Xia
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Peilin Liu
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Chao Gao
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Han Wang
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Lijian Zhang
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Jingjun Zhou
- Department of Physiology, School of Basic Medical Sciences, Fourth Military Medical University, Xi'an 710032, China
| | - Feng Gao
- Department of Physiology, School of Basic Medical Sciences, Fourth Military Medical University, Xi'an 710032, China
| | - Erhe Gao
- Center for Translational Medicine, School of Medicine, Temple University, Philadelphia, PA 19107, USA
| | - Walter J Koch
- Center for Translational Medicine, School of Medicine, Temple University, Philadelphia, PA 19107, USA
| | - Haichang Wang
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Heping Cheng
- Institutes of Molecular Medicine, Peking University, Beijing 100083, China
| | - Yan Qu
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China.
| | - Ling Tao
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China.
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Globular adiponectin attenuates myocardial ischemia/reperfusion injury by upregulating endoplasmic reticulum Ca²⁺-ATPase activity and inhibiting endoplasmic reticulum stress. J Cardiovasc Pharmacol 2014; 62:143-53. [PMID: 23609327 DOI: 10.1097/fjc.0b013e31829521af] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
AIM The aim of this study was to explore the mechanisms underlying the effects of globular adiponectin (gAd) on myocardial ischemia/reperfusion (I/R) injury. METHODS An in vivo myocardial I/R model and an in vitro neonatal rat cardiomyocyte hypoxia/reoxygenation (H/R) model simulating I/R injury in vivo were adopted to investigate whether and how the cardioprotective effects of gAd are mediated by the inhibition of endoplasmic reticulum (ER) stress. RESULTS gAd (1 μg/g, intravenously) attenuated the myocardial infarct size, myocardial enzyme activity, and apoptosis in rats with I/R, and similar protection was observed in primary cultures of neonatal rat cardiomyocytes. The protective effects of gAd were associated with the suppression of ER stress, as evidenced by reversing the upregulation of 78-kDa glucose-regulated protein, C/EBP homologous protein, and caspase-12 that were induced by H/R and thapsigargin. In addition, gAd conferred resistance to ER stress and cardiomyocyte injury by modulating ER Ca²⁺-ATPase (SERCA) activity. Moreover, gAd further increased H/R-enhanced Akt phosphorylation. The protective effects of gAd on ER stress and SERCA activity were abolished by preincubation of rat neonatal cardiomyocytes with the PI3K inhibitor LY294002. Consistent with this finding, I/R-induced ER stress and SERCA dysfunction were also significantly ameliorated by gAd. These effects involved PI3K/Akt signaling pathway. CONCLUSIONS The protective effects of gAd during I/R are mediated, at least in part, by modulating SERCA activity and consequently suppressing ER stress via the activation of PI3K/Akt signaling.
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Mattiazzi A, Kranias EG. The role of CaMKII regulation of phospholamban activity in heart disease. Front Pharmacol 2014; 5:5. [PMID: 24550830 PMCID: PMC3913884 DOI: 10.3389/fphar.2014.00005] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Accepted: 01/07/2014] [Indexed: 01/06/2023] Open
Abstract
Phospholamban (PLN) is a phosphoprotein in cardiac sarcoplasmic reticulum (SR) that is a reversible regulator of the Ca2+-ATPase (SERCA2a) activity and cardiac contractility. Dephosphorylated PLN inhibits SERCA2a and PLN phosphorylation, at either Ser16 by PKA or Thr17 by Ca2+-calmodulin-dependent protein kinase (CaMKII), reverses this inhibition. Through this mechanism, PLN is a key modulator of SR Ca2+ uptake, Ca2+ load, contractility, and relaxation. PLN phosphorylation is also the main determinant of β1-adrenergic responses in the heart. Although phosphorylation of Thr17 by CaMKII contributes to this effect, its role is subordinate to the PKA-dependent increase in cytosolic Ca2+, necessary to activate CaMKII. Furthermore, the effects of PLN and its phosphorylation on cardiac function are subject to additional regulation by its interacting partners, the anti-apoptotic HAX-1 protein and Gm or the anchoring unit of protein phosphatase 1. Regulation of PLN activity by this multimeric complex becomes even more important in pathological conditions, characterized by aberrant Ca2+-cycling. In this scenario, CaMKII-dependent PLN phosphorylation has been associated with protective effects in both acidosis and ischemia/reperfusion. However, the beneficial effects of increasing SR Ca2+ uptake through PLN phosphorylation may be lost or even become deleterious, when these occur in association with alterations in SR Ca2+ leak. Moreover, a major characteristic in human and experimental heart failure (HF) is depressed SR Ca2+ uptake, associated with decreased SERCA2a levels and dephosphorylation of PLN, leading to decreased SR Ca2+ load and impaired contractility. Thus, the strategy of altering SERCA2a and/or PLN levels or activity to restore perturbed SR Ca2+ uptake is a potential therapeutic tool for HF treatment. We will review here the role of CaMKII-dependent phosphorylation of PLN at Thr17 on cardiac function under physiological and pathological conditions.
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Affiliation(s)
- Alicia Mattiazzi
- Facultad de Medicina, Centro de Investigaciones Cardiovasculares, Conicet La Plata-Universidad Nacional de La Plata La Plata, Argentina
| | - Evangelia G Kranias
- Department of Pharmacology and Cell Biophysics, College of Medicine, University of Cincinnati Cincinnati, OH, USA
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Song BW, Hwang HJ, Seung M, Lee MH. Effect of hypoxic paracrine media on calcium-regulatory proteins in infarcted rat myocardium. Korean Circ J 2014; 44:16-21. [PMID: 24497885 PMCID: PMC3905111 DOI: 10.4070/kcj.2014.44.1.16] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 12/02/2013] [Accepted: 12/05/2013] [Indexed: 11/25/2022] Open
Abstract
Background and Objectives An increase in intracellular calcium concentration due to loss of Ca2+ homeostasis triggers arrhythmia or cardiac cell death in the heart. Paracrine factors released from stem cells have beneficial cardioprotective effects. However, the mechanism of modulation of Ca2+ homeostasis by paracrine factors in ischemic myocardium remains unclear. Materials and Methods We isolated rat bone marrow-derived mesenchymal stem cells (MSCs), and prepared paracrine media (PM) from MSCs under hypoxic or normoxic conditions (hypoxic PM and normoxic PM). We induced rat myocardial infarction by left anterior descending ligation for 1 hour, and treated PM into the border region of infarcted myocardium (n=6/group) to identify the alteration in calcium-regulated proteins. We isolated and stained the heart tissue with specific calcium-related antibodies after 11 days. Results The hypoxic PM treatment increased Ca2+-related proteins such as L-type Ca2+ channel, sarcoplasmic reticulum Ca2+ ATPase, Na+/K+ ATPase, and calmodulin, whereas the normoxic PM treatment increased those proteins only slightly. The sodium-calcium exchanger was significantly reduced by hypoxic PM treatment, compared to moderate suppression by the normoxic PM treatment. Conclusion Our results suggest that hypoxic PM was significantly associated with the positive regulation of Ca2+ homeostasis in infarcted myocardium.
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Affiliation(s)
- Byeong-Wook Song
- Institute of Catholic Integrative Medicine, Incheon St. Mary's Hospital, The Catholic University of Korea College of Medicine, Incheon, Korea
| | - Hye Jin Hwang
- Division of Cardiology, Severance Cardiovascular Research Center, Yonsei University College of Medicine, Seoul, Korea
| | - Minji Seung
- Division of Cardiology, Severance Cardiovascular Research Center, Yonsei University College of Medicine, Seoul, Korea
| | - Moon-Hyoung Lee
- Division of Cardiology, Severance Cardiovascular Research Center, Yonsei University College of Medicine, Seoul, Korea
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Aroor AR, Sowers JR, Bender SB, Nistala R, Garro M, Mugerfeld I, Hayden MR, Johnson MS, Salam M, Whaley-Connell A, Demarco VG. Dipeptidylpeptidase inhibition is associated with improvement in blood pressure and diastolic function in insulin-resistant male Zucker obese rats. Endocrinology 2013; 154:2501-13. [PMID: 23653460 PMCID: PMC3689282 DOI: 10.1210/en.2013-1096] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Diastolic dysfunction is a prognosticator for future cardiovascular events that demonstrates a strong correlation with obesity. Pharmacological inhibition of dipeptidylpeptidase-4 (DPP-4) to increase the bioavailability of glucagon-like peptide-1 is an emerging therapy for control of glycemia in type 2 diabetes patients. Accumulating evidence suggests that glucagon-like peptide-1 has insulin-independent actions in cardiovascular tissue. However, it is not known whether DPP-4 inhibition improves obesity-related diastolic dysfunction. Eight-week-old Zucker obese (ZO) and Zucker lean rats were fed normal chow diet or diet containing the DPP-4 inhibitor, linagliptin (LGT), for 8 weeks. Plasma DPP-4 activity was 3.3-fold higher in ZO compared with Zucker lean rats and was reduced by 95% with LGT treatment. LGT improved echocardiographic and pressure volume-derived indices of diastolic function that were impaired in ZO control rats, without altering food intake or body weight gain during the study period. LGT also blunted elevated blood pressure progression in ZO rats involving improved skeletal muscle arteriolar function, without reducing left ventricular hypertrophy, fibrosis, or oxidative stress in ZO hearts. Expression of phosphorylated- endothelial nitric oxide synthase (eNOS)(Ser1177), total eNOS, and sarcoplasmic reticulum calcium ATPase 2a protein was elevated in the LGT-treated ZO heart, suggesting improved Ca(2+) handling. The ZO myocardium had an abnormal mitochondrial sarcomeric arrangement and cristae structure that were normalized by LGT. These studies suggest that LGT reduces blood pressure and improves intracellular Cai(2+) mishandling and cardiomyocyte ultrastructure, which collectively result in improvements in diastolic function in the absence of reductions in left ventricular hypertrophy, fibrosis, or oxidative stress in insulin-resistant ZO rats.
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Affiliation(s)
- Annayya R Aroor
- Department of Internal Medicine, University of Missouri School of Medicine, and Diabetes and Cardiovascular Center, Columbia, MO 65212, USA
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Talukder MAH, Elnakish MT, Yang F, Nishijima Y, Alhaj MA, Velayutham M, Hassanain HH, Zweier JL. Cardiomyocyte-specific overexpression of an active form of Rac predisposes the heart to increased myocardial stunning and ischemia-reperfusion injury. Am J Physiol Heart Circ Physiol 2012; 304:H294-302. [PMID: 23161879 DOI: 10.1152/ajpheart.00367.2012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The GTP-binding protein Rac regulates diverse cellular functions including activation of NADPH oxidase, a major source of superoxide production (O(2)(·-)). Rac1-mediated NADPH oxidase activation is increased after myocardial infarction (MI) and heart failure both in animals and humans; however, the impact of increased myocardial Rac on impending ischemia-reperfusion (I/R) is unknown. A novel transgenic mouse model with cardiac-specific overexpression of constitutively active mutant form of Zea maize Rac D (ZmRacD) gene has been reported with increased myocardial Rac-GTPase activity and O(2)(·-) generation. The goal of the present study was to determine signaling pathways related to increased myocardial ZmRacD and to what extent hearts with increased ZmRacD proteins are susceptible to I/R injury. The effect of myocardial I/R was examined in young adult wild-type (WT) and ZmRacD transgenic (TG) mice. In vitro reversible myocardial I/R for postischemic cardiac function and in vivo regional myocardial I/R for MI were performed. Following 20-min global ischemia and 45-min reperfusion, postischemic cardiac contractile function and heart rate were significantly reduced in TG hearts compared with WT hearts. Importantly, acute regional myocardial I/R (30-min ischemia and 24-h reperfusion) caused significantly larger MI in TG mice compared with WT mice. Western blot analysis of cardiac homogenates revealed that increased myocardial ZmRacD gene expression is associated with concomitant increased levels of NADPH oxidase subunit gp91(phox), O(2)(·-), and P(21)-activated kinase. Thus these findings provide direct evidence that increased levels of active myocardial Rac renders the heart susceptible to increased postischemic contractile dysfunction and MI following acute I/R.
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Affiliation(s)
- M A Hassan Talukder
- Dorothy M. Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine
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Zhang YM, Wang CY, Zheng FC, Gao FF, Chen YC, Huang ZQ, Xia ZY, Irwin MG, Li WQ, Liu XP, Zheng YS, Xu H, Shi GG. Effects of N-n-butyl haloperidol iodide on the rat myocardial sarcoplasmic reticulum Ca(2+)-ATPase during ischemia/reperfusion. Biochem Biophys Res Commun 2012; 425:426-30. [PMID: 22846577 DOI: 10.1016/j.bbrc.2012.07.117] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Accepted: 07/20/2012] [Indexed: 02/05/2023]
Abstract
We have previously shown that N-n-butyl haloperidol iodide (F(2)), a newly synthesized compound, reduces ischemia/reperfusion (I/R) injury by preventing intracellular Ca(2+) overload through inhibiting L-type calcium channels and outward current of Na(+)/Ca(2+) exchanger. This study was to investigate the effects of F(2) on activity and protein expression of the rat myocardial sarcoplasmic reticulum Ca(2+)-ATPase (SERCA) during I/R to discover other molecular mechanisms by which F(2) maintains intracellular Ca(2+) homeostasis. In an in vivo rat model of myocardial I/R achieved by occluding coronary artery for 30-60 min followed by 0-120 min reperfusion, treatment with F(2) (0.25, 0.5, 1, 2 and 4 mg/kg, respectively) dose-dependently inhibited the I/R-induced decrease in SERCA activity. However, neither different durations of I/R nor different doses of F(2) altered the expression levels of myocardial SERCA2a protein. These results indicate that F(2) exerts cardioprotective effects against I/R injury by inhibiting I/R-mediated decrease in SERCA activity by a mechanism independent of SERCA2a protein levels modulation.
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Affiliation(s)
- Yan-Mei Zhang
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, Guangdong, China
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Lygate CA, Bohl S, ten Hove M, Faller KME, Ostrowski PJ, Zervou S, Medway DJ, Aksentijevic D, Sebag-Montefiore L, Wallis J, Clarke K, Watkins H, Schneider JE, Neubauer S. Moderate elevation of intracellular creatine by targeting the creatine transporter protects mice from acute myocardial infarction. Cardiovasc Res 2012; 96:466-75. [PMID: 22915766 PMCID: PMC3500046 DOI: 10.1093/cvr/cvs272] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Aims Increasing energy storage capacity by elevating creatine and phosphocreatine (PCr) levels to increase ATP availability is an attractive concept for protecting against ischaemia and heart failure. However, testing this hypothesis has not been possible since oral creatine supplementation is ineffectual at elevating myocardial creatine levels. We therefore used mice overexpressing creatine transporter in the heart (CrT-OE) to test for the first time whether elevated creatine is beneficial in clinically relevant disease models of heart failure and ischaemia/reperfusion (I/R) injury. Methods and results CrT-OE mice were selected for left ventricular (LV) creatine 20–100% above wild-type values and subjected to acute and chronic coronary artery ligation. Increasing myocardial creatine up to 100% was not detrimental even in ageing CrT-OE. In chronic heart failure, creatine elevation was neither beneficial nor detrimental, with no effect on survival, LV remodelling or dysfunction. However, CrT-OE hearts were protected against I/R injury in vivo in a dose-dependent manner (average 27% less myocardial necrosis) and exhibited greatly improved functional recovery following ex vivo I/R (59% of baseline vs. 29%). Mechanisms contributing to ischaemic protection in CrT-OE hearts include elevated PCr and glycogen levels and improved energy reserve. Furthermore, creatine loading in HL-1 cells did not alter antioxidant defences, but delayed mitochondrial permeability transition pore opening in response to oxidative stress, suggesting an additional mechanism to prevent reperfusion injury. Conclusion Elevation of myocardial creatine by 20–100% reduced myocardial stunning and I/R injury via pleiotropic mechanisms, suggesting CrT activation as a novel, potentially translatable target for cardiac protection from ischaemia.
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Affiliation(s)
- Craig A Lygate
- Department of Cardiovascular Medicine, University of Oxford, Wellcome Trust Centre for Human Genetics, Roosevelt Drive, Oxford OX3 7BN, UK.
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Van der Mieren G, Nevelsteen I, Vanderper A, Oosterlinck W, Flameng W, Herijgers P. Angiotensin-converting enzyme inhibition and food restriction in diabetic mice do not correct the increased sensitivity for ischemia-reperfusion injury. Cardiovasc Diabetol 2012; 11:89. [PMID: 22853195 PMCID: PMC3444392 DOI: 10.1186/1475-2840-11-89] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Accepted: 07/18/2012] [Indexed: 01/14/2023] Open
Abstract
Background The number of patients with diabetes or the metabolic syndrome reaches epidemic proportions. On top of their diabetic cardiomyopathy, these patients experience frequent and severe cardiac ischemia-reperfusion (IR) insults, which further aggravate their degree of heart failure. Food restriction and angiotensin-converting enzyme inhibition (ACE-I) are standard therapies in these patients but the effects on cardiac IR injury have never been investigated. In this study, we tested the hypothesis that 1° food restriction and 2° ACE-I reduce infarct size and preserve cardiac contractility after IR injury in mouse models of diabetes and the metabolic syndrome. Methods C57Bl6/J wild type (WT) mice, leptin deficient ob/ob (model for type II diabetes) and double knock-out (LDLR-/-;ob/ob, further called DKO) mice with combined leptin and LDL-receptor deficiency (model for metabolic syndrome) were used. The effects of 12 weeks food restriction or ACE-I on infarct size and load-independent left ventricular contractility after 30 min regional cardiac ischemia were investigated. Differences between groups were analyzed for statistical significance by Student’s t-test or factorial ANOVA followed by a Fisher’s LSD post hoc test. Results Infarct size was larger in ob/ob and DKO versus WT. Twelve weeks of ACE-I improved pre-ischemic left ventricular contractility in ob/ob and DKO. Twelve weeks of food restriction, with a weight reduction of 35-40%, or ACE-I did not reduce the effect of IR. Conclusion ACE-I and food restriction do not correct the increased sensitivity for cardiac IR-injury in mouse models of type II diabetes and the metabolic syndrome.
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Affiliation(s)
- Gerry Van der Mieren
- Department of Cardiovascular Sciences, Research Unit Experimental Cardiac Surgery, K.U. Leuven, Herestraat 49, B-3000, Leuven, Belgium
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Stutzmann GE, Mattson MP. Endoplasmic reticulum Ca(2+) handling in excitable cells in health and disease. Pharmacol Rev 2011; 63:700-27. [PMID: 21737534 DOI: 10.1124/pr.110.003814] [Citation(s) in RCA: 183] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The endoplasmic reticulum (ER) is a morphologically and functionally diverse organelle capable of integrating multiple extracellular and internal signals and generating adaptive cellular responses. It plays fundamental roles in protein synthesis and folding and in cellular responses to metabolic and proteotoxic stress. In addition, the ER stores and releases Ca(2+) in sophisticated scenarios that regulate a range of processes in excitable cells throughout the body, including muscle contraction and relaxation, endocrine regulation of metabolism, learning and memory, and cell death. One or more Ca(2+) ATPases and two types of ER membrane Ca(2+) channels (inositol trisphosphate and ryanodine receptors) are the major proteins involved in ER Ca(2+) uptake and release, respectively. There are also direct and indirect interactions of ER Ca(2+) stores with plasma membrane and mitochondrial Ca(2+)-regulating systems. Pharmacological agents that selectively modify ER Ca(2+) release or uptake have enabled studies that revealed many different physiological roles for ER Ca(2+) signaling. Several inherited diseases are caused by mutations in ER Ca(2+)-regulating proteins, and perturbed ER Ca(2+) homeostasis is implicated in a range of acquired disorders. Preclinical investigations suggest a therapeutic potential for use of agents that target ER Ca(2+) handling systems of excitable cells in disorders ranging from cardiac arrhythmias and skeletal muscle myopathies to Alzheimer disease.
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Affiliation(s)
- Grace E Stutzmann
- Department of Neuroscience, Rosalind Franklin University/The Chicago Medical School, 3333 Green Bay Road, North Chicago, IL 60064, USA.
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Talukder MAH, Yang F, Nishijima Y, Chen CA, Xie L, Mahamud SD, Kalyanasundaram A, Bonagura JD, Periasamy M, Zweier JL. Detrimental effects of thyroid hormone analog DITPA in the mouse heart: increased mortality with in vivo acute myocardial ischemia-reperfusion. Am J Physiol Heart Circ Physiol 2010; 300:H702-11. [PMID: 21131480 DOI: 10.1152/ajpheart.00514.2010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
There is emerging evidence that treatment with thyroid hormone (TH) can improve postischemic cardiac function. 3,5-Diiodothyropropionic acid (DITPA), a TH analog, has been proposed to be a safer therapeutic agent than TH because of its negligible effects on cardiac metabolism and heart rate. However, conflicting results have been reported for the cardiac effects of DITPA. Importantly, recent clinical trials demonstrated no symptomatic benefit in patients with DITPA despite some improved hemodynamic and metabolic parameters. To address these issues, dose-dependent effects of DITPA were investigated in mice for baseline cardiovascular effects and postischemic myocardial function and/or salvage. Mice were treated with subcutaneous DITPA at 0.937, 1.875, 3.75, or 7.5 mg·kg(-1)·day(-1) for 7 days, and the results were compared with untreated mice for ex vivo and/or in vivo myocardial ischemia-reperfusion (I/R). DITPA had no effects on baseline body temperature, body weight, or heart rate; however, it mildly increased blood pressure. In isolated hearts, baseline contractile function was significantly impaired in DITPA-pretreated mice; however, postischemic recovery was comparable between untreated and DITPA-treated groups. In vivo baseline cardiac parameters were significantly affected by DITPA, with increased ventricular dimensions and decreased contractile function. Importantly, DITPA-treated mice demonstrated high prevalence of fatal cardiac rhythm abnormalities during in vivo ischemia and/or reperfusion. There were no improvements in myocardial infarction and postischemic fractional shortening with DITPA. Myocardial sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA), phospholamban (PLB), and heat shock protein (HSP) levels remained unchanged with DITPA treatment. Thus DITPA administration impairs baseline cardiac parameters in mice and can be fatal during in vivo acute myocardial I/R.
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Affiliation(s)
- M A Hassan Talukder
- Davis Heart and Lung Research Institute, Department of Internal Medicine, Ohio State University College of Medicine, 473 West 12th Ave., Columbus, OH 43210, USA
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Talukder MH, Zweier JL, Periasamy M. Targeting calcium transport in ischaemic heart disease. Cardiovasc Res 2009; 84:345-52. [PMID: 19640931 PMCID: PMC2777954 DOI: 10.1093/cvr/cvp264] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 07/14/2009] [Accepted: 07/20/2009] [Indexed: 01/14/2023] Open
Abstract
Ischaemic heart disease (IHD) is the leading cause of morbidity and mortality worldwide. While timely reperfusion of acutely ischaemic myocardium is essential for myocardial salvage, it leads to a unique type of injury known as 'myocardial ischaemia/reperfusion (I/R) injury'. Growing evidence suggests that a defect in myocardial Ca(2+) transport system with cytosolic Ca(2+) overload is a major contributor to myocardial I/R injury. Progress in molecular genetics and medicine in past years has clearly demonstrated that modulation of Ca(2+) handling pathways in IHD could be cardioprotective. The potential benefits of these strategies in limiting I/R injury are vast, and the time is right for challenging in vivo systemic work both at pre-clinical and clinical levels.
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Affiliation(s)
- M.A. Hassan Talukder
- Davis Heart and Lung Institute and The Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Jay L. Zweier
- Davis Heart and Lung Institute and The Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University College of Medicine, Columbus, OH 43210, USA
- Department of Physiology and Cell Biology, The Ohio State University College of Medicine, 304 Hamilton Hall, 1645 Neil Avenue, Columbus, OH 43210, USA
| | - Muthu Periasamy
- Davis Heart and Lung Institute and The Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University College of Medicine, Columbus, OH 43210, USA
- Department of Physiology and Cell Biology, The Ohio State University College of Medicine, 304 Hamilton Hall, 1645 Neil Avenue, Columbus, OH 43210, USA
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Mice carrying a conditional Serca2(flox) allele for the generation of Ca(2+) handling-deficient mouse models. Cell Calcium 2009; 46:219-25. [PMID: 19692123 DOI: 10.1016/j.ceca.2009.07.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2009] [Revised: 06/09/2009] [Accepted: 07/13/2009] [Indexed: 11/24/2022]
Abstract
Sarco(endo)plasmic reticulum calcium ATPases (SERCA) are cellular pumps that transport Ca(2+) into the sarcoplasmic reticulum (SR). Serca2 is the most widely expressed gene family member. The very early embryonic lethality of Serca2(null) mouse embryos has precluded further evaluation of loss of Serca2 function in the context of organ physiology. We have generated mice carrying a conditional Serca2(flox) allele which allows disruption of the Serca2 gene in an organ-specific and/or inducible manner. The model was tested by mating Serca2(flox) mice with MLC-2v(wt/Cre) mice and with alphaMHC-Cre transgenic mice. In heterozygous Serca2(wt/flox)MLC-2v(wt/Cre) mice, the expression of SERCA2a and SERCA2b proteins were reduced in the heart and slow skeletal muscle, in accordance with the expression pattern of the MLC-2v gene. In Serca2(flox/flox) Tg(alphaMHC-Cre) embryos with early homozygous cardiac Serca2 disruption, normal embryonic development and yolk sac circulation was maintained up to at least embryonic stage E10.5. The Serca2(flox) mouse is the first murine conditional gene disruption model for the SERCA family of Ca(2+) ATPases, and should be a powerful tool for investigating specific physiological roles of SERCA2 function in a range of tissues and organs in vivo both in adult and embryonic stages.
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Inserte J, Barrabes JA, Hernando V, Garcia-Dorado D. Orphan targets for reperfusion injury. Cardiovasc Res 2009; 83:169-78. [DOI: 10.1093/cvr/cvp109] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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Nicolaou P, Rodriguez P, Ren X, Zhou X, Qian J, Sadayappan S, Mitton B, Pathak A, Robbins J, Hajjar RJ, Jones K, Kranias EG. Inducible expression of active protein phosphatase-1 inhibitor-1 enhances basal cardiac function and protects against ischemia/reperfusion injury. Circ Res 2009; 104:1012-20. [PMID: 19299645 DOI: 10.1161/circresaha.108.189811] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Ischemic heart disease, which remains the leading cause of morbidity and mortality in the Western world, is invariably characterized by impaired cardiac function and disturbed Ca(2+) homeostasis. Because enhanced inhibitor-1 (I-1) activity has been suggested to preserve Ca(2+) cycling, we sought to define whether increases in I-1 activity in the adult heart may ameliorate contractile dysfunction and cellular injury in the face of an ischemic insult. To this end, we generated an inducible transgenic mouse model that enabled temporally controlled expression of active I-1 (T35D). Active I-1 expression in the adult heart elicited significant enhancement of contractile function, associated with preferential phospholamban phosphorylation and enhanced sarcoplasmic reticulum Ca(2+)-transport. Further phosphoproteomic analysis revealed alterations in proteins associated with energy production and protein synthesis, possibly to support the increased metabolic demands of the hyperdynamic hearts. Importantly, on ischemia/reperfusion-induced injury, active I-1 expression augmented contractile function and recovery. Further examination revealed that the infarct region and apoptotic as well as necrotic injuries were significantly attenuated by enhanced I-1 activity. These cardioprotective effects were associated with suppression of the endoplasmic reticulum stress response. The present findings indicate that increased I-1 activity in the adult heart enhances Ca(2+) cycling and improves mechanical recovery, as well as cell survival after an ischemic insult, suggesting that active I-1 may represent a potential therapeutic strategy in myocardial infarction.
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Affiliation(s)
- Persoulla Nicolaou
- Department of Pharmacology and Cell Biophysics, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0575, USA
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Zuo L, Chen YR, Reyes LA, Lee HL, Chen CL, Villamena FA, Zweier JL. The radical trap 5,5-dimethyl-1-pyrroline N-oxide exerts dose-dependent protection against myocardial ischemia-reperfusion injury through preservation of mitochondrial electron transport. J Pharmacol Exp Ther 2009; 329:515-23. [PMID: 19201989 DOI: 10.1124/jpet.108.143479] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Free radicals are important mediators of myocardial ischemia-reperfusion injury. Nitrone spin traps have been shown to scavenge free radicals. The cardioprotective effect of the spin trap, 5,5-dimethyl-1-pyrroline N-oxide (DMPO), was investigated in an isolated heart model of global ischemia and reperfusion. Rat hearts were perfused and subjected to global ischemia for 30 min followed by reperfusion with four treatment groups of varying DMPO concentration (0.5-10 mM) administered before induction of ischemia. DMPO treatment improved the recovery of left ventricular (LV) function and coronary flow over the 30-min period of reperfusion compared with untreated hearts. Enhanced recovery was observed for all doses studied but was highest with 1 mM treatment with 2.4-fold higher recovery of LV developed pressure and 37% reduction in infarct size. Superoxide was measured by tissue fluorometry using the O(2)* probe hydroethidine. Hearts treated with 1 mM DMPO showed a significant reduction in O(2)* production compared with control hearts both over the first 5 min of ischemia and upon reperfusion after 30 min of global ischemia. Studies of mitochondrial function demonstrated that 1 mM DMPO increased the recovery of function of complexes I, II/III, and IV after 30 min of reperfusion. Immunoblotting with antibodies against complexes I, II, and IV further revealed marked up-regulation of mitochondrial proteins, suggesting that DMPO prevents their ischemic degradation via scavenging oxygen radicals generated during ischemia/reperfusion. Thus, DMPO functions as a protective agent against ischemic and postischemic injury via radical scavenging, conferring robust dose-dependent protection with salvage of mitochondrial function and redox homeostasis.
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Affiliation(s)
- Li Zuo
- Center for Biomedical Electron Paramagnetic Resonance Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, Ohio State University, Columbus, OH 43210-1252, USA
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Ahmad S, Ahmad A, Dremina ES, Sharov VS, Guo X, Jones TN, Loader JE, Tatreau JR, Perraud AL, Schöneich C, Randell SH, White CW. Bcl-2 suppresses sarcoplasmic/endoplasmic reticulum Ca2+-ATPase expression in cystic fibrosis airways: role in oxidant-mediated cell death. Am J Respir Crit Care Med 2009; 179:816-26. [PMID: 19201925 DOI: 10.1164/rccm.200807-1104oc] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE Modulation of the activity of sarcoendoplasmic reticulum calcium ATPase (SERCA) can profoundly affect Ca(2+) homeostasis. Although altered calcium homeostasis is a characteristic of cystic fibrosis (CF), the role of SERCA is unknown. OBJECTIVES This study provides a comprehensive investigation of expression and activity of SERCA in CF airway epithelium. A detailed study of the mechanisms underlying SERCA changes and its consequences was also undertaken. METHODS Lung tissue samples (bronchus and bronchiole) from subjects with and without CF were evaluated by immunohistochemistry. Protein and mRNA expression in primary non-CF and CF cells was determined by Western and Northern blots. MEASUREMENTS AND MAIN RESULTS SERCA2 expression was decreased in bronchial and bronchiolar epithelia of subjects with CF. SERCA2 expression in lysates of polarized tracheobronchial epithelial cells from subjects with CF was decreased by 67% as compared with those from subjects without CF. Several non-CF and CF airway epithelial cell lines were also probed. SERCA2 expression and activity were consistently decreased in CF cell lines. Adenoviral expression of mutant F508 cystic fibrosis transmembrane regulator gene (CFTR), inhibition of CFTR function pharmacologically (CFTR(inh)172), or stable expression of antisense oligonucleotides to inhibit CFTR expression caused decreased SERCA2 expression. In CF cells, SERCA2 interacted with Bcl-2, leading to its displacement from caveolae-related domains of endoplasmic reticulum membranes, as demonstrated in sucrose density gradient centrifugation and immunoprecipitation studies. Knockdown of SERCA2 using siRNA enhanced epithelial cell death due to ozone, hydrogen peroxide, and TNF-alpha. CONCLUSIONS Reduced SERCA2 expression may alter calcium signaling and apoptosis in CF. These findings decrease the likelihood of therapeutic benefit of SERCA inhibition in CF.
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Affiliation(s)
- Shama Ahmad
- Department of Pediatrics, National Jewish Medical and Research Center, A440, 1400 Jackson Street, Denver, CO 80206, USA.
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Talukder MAH, Yang F, Nishijima Y, Chen CA, Kalyanasundaram A, Periasamy M, Zweier JL. Reduced SERCA2a converts sub-lethal myocardial injury to infarction and affects postischemic functional recovery. J Mol Cell Cardiol 2008; 46:285-7. [PMID: 19046972 DOI: 10.1016/j.yjmcc.2008.10.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2008] [Revised: 10/24/2008] [Accepted: 10/24/2008] [Indexed: 11/28/2022]
Abstract
The goal of the present study was to assess how reduced SERCA2a expression affects in vivo myocardial ischemia/reperfusion (I/R) injury. We specifically wanted to determine to what extent hearts with reduced SERCA2a levels are susceptible to in vivo I/R injury. Therefore, we examined the effects of different ischemic periods on post-ischemic myocardial injury in wild-type (WT) and SERCA2a heterozygous knockout (SERCA2a(+/-)) mice expressing lower levels of SERCA2a pump in vivo. Following 20-min ischemia and 48-hour reperfusion, SERCA2a(+/-) mice developed significant myocardial infarction (MI) compared to negligible infarction in WT mice (14+/-3% vs. 3+/-1%, P<0.01); whereas following 30-min ischemia, the infarction was significantly larger in SERCA2a(+/-) mice compared to WT mice (49+/-5% vs. 37+/-3%, P<0.05). Further, echocardiographic analysis revealed worsened postischemic contractile function in SERCA2a(+/-) mice compared to WT mice. Thus, these findings demonstrate that maintaining optimal SERCA2a function is critical for myocardial protection from I/R injury and postischemic functional recovery.
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Affiliation(s)
- M A Hassan Talukder
- Davis Heart and Lung Research Institute, and The Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University College of Medicine and Public Health, Ohio, USA
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