1
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Bornstein MR, Tian R, Arany Z. Human cardiac metabolism. Cell Metab 2024; 36:1456-1481. [PMID: 38959861 PMCID: PMC11290709 DOI: 10.1016/j.cmet.2024.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Revised: 04/12/2024] [Accepted: 06/05/2024] [Indexed: 07/05/2024]
Abstract
The heart is the most metabolically active organ in the human body, and cardiac metabolism has been studied for decades. However, the bulk of studies have focused on animal models. The objective of this review is to summarize specifically what is known about cardiac metabolism in humans. Techniques available to study human cardiac metabolism are first discussed, followed by a review of human cardiac metabolism in health and in heart failure. Mechanistic insights, where available, are reviewed, and the evidence for the contribution of metabolic insufficiency to heart failure, as well as past and current attempts at metabolism-based therapies, is also discussed.
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Affiliation(s)
- Marc R Bornstein
- Cardiovascular Institute Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Rong Tian
- Mitochondria and Metabolism Center, Department of Anesthesiology & Pain Medicine, University of Washington, Seattle, WA, USA
| | - Zoltan Arany
- Cardiovascular Institute Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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2
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Yu T, Gao Q, Zhang G, Li T, Liu X, Li C, Zheng L, Sun X, Wu J, Cao H, Bi F, Wang R, Liang H, Li X, Zhou Y, Lv L, Shan H. lncRNA Gm20257 alleviates pathological cardiac hypertrophy by modulating the PGC-1α-mitochondrial complex IV axis. Front Med 2024:10.1007/s11684-024-1065-7. [PMID: 38926249 DOI: 10.1007/s11684-024-1065-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 01/17/2024] [Indexed: 06/28/2024]
Abstract
Pathological cardiac hypertrophy, a major contributor to heart failure, is closely linked to mitochondrial function. The roles of long noncoding RNAs (lncRNAs), which regulate mitochondrial function, remain largely unexplored in this context. Herein, a previously unknown lncRNA, Gm20257, was identified. It markedly increased under hypertrophic stress in vivo and in vitro. The suppression of Gm20257 by using small interfering RNAs significantly induced cardiomyocyte hypertrophy. Conversely, the overexpression of Gm20257 through plasmid transfection or adeno-associated viral vector-9 mitigated angiotensin II-induced hypertrophic phenotypes in neonatal mouse ventricular cells or alleviated cardiac hypertrophy in a mouse TAC model respectively, thus restoring cardiac function. Importantly, Gm20257 restored mitochondrial complex IV level and enhanced mitochondrial function. Bioinformatics prediction showed that Gm20257 had a high binding score with peroxisome proliferator-activated receptor coactivator-1 (PGC-1α), which could increase mitochondrial complex IV. Subsequently, Western blot analysis results revealed that Gm20257 substantially affected the expression of PGC-1α. Further analyses through RNA immunoprecipitation and immunoblotting following RNA pull-down indicated that PGC-1α was a direct downstream target of Gm20257. This interaction was demonstrated to rescue the reduction of mitochondrial complex IV induced by hypertrophic stress and promote the generation of mitochondrial ATP. These findings suggest that Gm20257 improves mitochondrial function through the PGC-1α-mitochondrial complex IV axis, offering a novel approach for attenuating pathological cardiac hypertrophy.
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Affiliation(s)
- Tong Yu
- Shanghai Frontiers Science Research Center for Druggability of Cardiovascular Noncoding RNA, Institute for Frontier Medical Technology, Shanghai University of Engineering Science, Shanghai, 201620, China
| | - Qiang Gao
- Department of Physiology, School of Basic Medicine, Harbin Medical University, Harbin, 150081, China
| | - Guofang Zhang
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Tianyu Li
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Xiaoshan Liu
- Shanghai Frontiers Science Research Center for Druggability of Cardiovascular Noncoding RNA, Institute for Frontier Medical Technology, Shanghai University of Engineering Science, Shanghai, 201620, China
| | - Chao Li
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Lan Zheng
- Department of Physiology, School of Basic Medicine, Harbin Medical University, Harbin, 150081, China
| | - Xiang Sun
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Jianbo Wu
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Huiying Cao
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Fangfang Bi
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Ruifeng Wang
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Haihai Liang
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Xuelian Li
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Yuhong Zhou
- State Key Laboratory of Frigid Zone Cardiovascular Disease, Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, 150081, China
| | - Lifang Lv
- Department of Physiology, School of Basic Medicine, Harbin Medical University, Harbin, 150081, China.
- The Center of Functional Experiment Teaching, School of Basic Medicine, Harbin Medical University, Harbin, 150081, China.
| | - Hongli Shan
- Shanghai Frontiers Science Research Center for Druggability of Cardiovascular Noncoding RNA, Institute for Frontier Medical Technology, Shanghai University of Engineering Science, Shanghai, 201620, China.
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3
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Bhullar SK, Dhalla NS. Status of Mitochondrial Oxidative Phosphorylation during the Development of Heart Failure. Antioxidants (Basel) 2023; 12:1941. [PMID: 38001794 PMCID: PMC10669359 DOI: 10.3390/antiox12111941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 10/23/2023] [Accepted: 10/27/2023] [Indexed: 11/26/2023] Open
Abstract
Mitochondria are specialized organelles, which serve as the "Power House" to generate energy for maintaining heart function. These organelles contain various enzymes for the oxidation of different substrates as well as the electron transport chain in the form of Complexes I to V for producing ATP through the process of oxidative phosphorylation (OXPHOS). Several studies have shown depressed OXPHOS activity due to defects in one or more components of the substrate oxidation and electron transport systems which leads to the depletion of myocardial high-energy phosphates (both creatine phosphate and ATP). Such changes in the mitochondria appear to be due to the development of oxidative stress, inflammation, and Ca2+-handling abnormalities in the failing heart. Although some investigations have failed to detect any changes in the OXPHOS activity in the failing heart, such results appear to be due to a loss of Ca2+ during the mitochondrial isolation procedure. There is ample evidence to suggest that mitochondrial Ca2+-overload occurs, which is associated with impaired mitochondrial OXPHOS activity in the failing heart. The depression in mitochondrial OXPHOS activity may also be due to the increased level of reactive oxygen species, which are formed as a consequence of defects in the electron transport complexes in the failing heart. Various metabolic interventions which promote the generation of ATP have been reported to be beneficial for the therapy of heart failure. Accordingly, it is suggested that depression in mitochondrial OXPHOS activity plays an important role in the development of heart failure.
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Affiliation(s)
| | - Naranjan S. Dhalla
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, Department of Physiology and Pathophysiology, Max Rady College of Medicine, University of Manitoba, Winnipeg, MB R2H 2A6, Canada;
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4
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Xiong H, Zheng Z, Zhao C, Zhao M, Wang Q, Zhang P, Li Y, Zhu Y, Zhu S, Li J. Insight into the underlying molecular mechanism of dilated cardiomyopathy through integrative analysis of data mining, iTRAQ-PRM proteomics and bioinformatics. Proteome Sci 2023; 21:13. [PMID: 37740197 PMCID: PMC10517512 DOI: 10.1186/s12953-023-00214-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 08/28/2023] [Indexed: 09/24/2023] Open
Abstract
BACKGROUND DCM is a common cardiomyopathy worldwide, which is characterized by ventricular dilatation and systolic dysfunction. DCM is one of the most widespread diseases contributing to sudden death and heart failure. However, our understanding of its molecular mechanisms is limited because of its etiology and underlying mechanisms. Hence, this study explored the underlying molecular mechanism of dilated cardiomyopathy through integrative analysis of data mining, iTRAQ-PRM proteomics and bioinformatics METHODS: DCM target genes were downloaded from the public databases. Next, DCM was induced in 20 rats by 8 weeks doxorubicin treatment (2.5 mg/kg/week). We applied isobaric tags for a relative and absolute quantification (iTRAQ) coupled with proteomics approach to identify differentially expressed proteins (DEPs) in myocardial tissue. After association analysis of the DEPs and the key target genes, subsequent analyses, including functional annotation, pathway enrichment, validation, were performed. RESULTS Nine hundred thirty-five genes were identified as key target genes from public databases. Meanwhile, a total of 782 DEPs, including 348 up-regulated and 434 down-regulated proteins, were identified in our animal experiment. The functional annotation of these DEPs revealed complicated molecular mechanisms including TCA cycle, Oxidative phosphorylation, Cardiac muscle contraction. Moreover, the DEPs were analyzed for association with the key target genes screened in the public dataset. We further determined the importance of these three pathways. CONCLUSION Our results demonstrate that TCA cycle, Oxidative phosphorylation, Cardiac muscle contraction played important roles in the detailed molecular mechanisms of DCM.
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Affiliation(s)
- Hongli Xiong
- Department of Forensic Medicine, Faculty of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China
| | - Zhe Zheng
- Department of Forensic Medicine, Henan University of Science and Technology, Luoyang, 471023, Henan, China
| | - Congcong Zhao
- Department of Forensic Medicine, Faculty of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China
| | - Minzhu Zhao
- Department of Forensic Medicine, Faculty of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China
| | - Qi Wang
- Department of Forensic Medicine, Faculty of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China
| | - Peng Zhang
- Department of Forensic Medicine, Hainan Medical University, Haikou, 571100, China
| | - Yongguo Li
- Department of Forensic Medicine, Faculty of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China
| | - Ying Zhu
- Department of Forensic Medicine, Faculty of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China
| | - Shisheng Zhu
- Faculty of Basic Medical Sciences, Chongqing Medical and Pharmaceutical College, Chongqing, 401331, China.
| | - Jianbo Li
- Department of Forensic Medicine, Faculty of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China.
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5
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Schenkl C, Heyne E, Doenst T, Schulze PC, Nguyen TD. Targeting Mitochondrial Metabolism to Save the Failing Heart. Life (Basel) 2023; 13:life13041027. [PMID: 37109556 PMCID: PMC10143865 DOI: 10.3390/life13041027] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 03/28/2023] [Accepted: 04/11/2023] [Indexed: 04/29/2023] Open
Abstract
Despite considerable progress in treating cardiac disorders, the prevalence of heart failure (HF) keeps growing, making it a global medical and economic burden. HF is characterized by profound metabolic remodeling, which mostly occurs in the mitochondria. Although it is well established that the failing heart is energy-deficient, the role of mitochondria in the pathophysiology of HF extends beyond the energetic aspects. Changes in substrate oxidation, tricarboxylic acid cycle and the respiratory chain have emerged as key players in regulating myocardial energy homeostasis, Ca2+ handling, oxidative stress and inflammation. This work aims to highlight metabolic alterations in the mitochondria and their far-reaching effects on the pathophysiology of HF. Based on this knowledge, we will also discuss potential metabolic approaches to improve cardiac function.
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Affiliation(s)
- Christina Schenkl
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany
| | - Estelle Heyne
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany
| | - Torsten Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany
| | - Paul Christian Schulze
- Department of Medicine I (Cardiology, Angiology, Critical Care Medicine), Jena University Hospital, Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany
| | - Tien Dung Nguyen
- Department of Medicine I (Cardiology, Angiology, Critical Care Medicine), Jena University Hospital, Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany
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Abstract
Chronic kidney disease is associated with an increased risk for the development and progression of cardiovascular disorders including hypertension, dyslipidemia, and coronary artery disease. Chronic kidney disease may also affect the myocardium through complex systemic changes, resulting in structural remodeling such as hypertrophy and fibrosis, as well as impairments in both diastolic and systolic function. These cardiac changes in the setting of chronic kidney disease define a specific cardiomyopathic phenotype known as uremic cardiomyopathy. Cardiac function is tightly linked to its metabolism, and research over the past 3 decades has revealed significant metabolic remodeling in the myocardium during the development of heart failure. Because the concept of uremic cardiomyopathy has only been recognized in recent years, there are limited data on metabolism in the uremic heart. Nonetheless, recent findings suggest overlapping mechanisms with heart failure. This work reviews key features of metabolic remodeling in the failing heart in the general population and extends this to patients with chronic kidney disease. The knowledge of similarities and differences in cardiac metabolism between heart failure and uremic cardiomyopathy may help identify new targets for mechanistic and therapeutic research on uremic cardiomyopathy.
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Affiliation(s)
- T Dung Nguyen
- Department of Internal Medicine I, University Hospital Jena, Jena, Germany
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7
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Ahmed A, Syed JN, Chi L, Wang Y, Perez-Romero C, Lee D, Kocaqi E, Caballero A, Yang J, Escalante-Covarrubias Q, Ishimura A, Suzuki T, Aguilar-Arnal L, Gonzales GB, Kim KH, Delgado-Olguín P. KDM8 epigenetically controls cardiac metabolism to prevent initiation of dilated cardiomyopathy. NATURE CARDIOVASCULAR RESEARCH 2023; 2:174-191. [PMID: 38665902 PMCID: PMC11041705 DOI: 10.1038/s44161-023-00214-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 01/05/2023] [Indexed: 04/28/2024]
Abstract
Cardiac metabolism is deranged in heart failure, but underlying mechanisms remain unclear. Here, we show that lysine demethylase 8 (Kdm8) maintains an active mitochondrial gene network by repressing Tbx15, thus preventing dilated cardiomyopathy leading to lethal heart failure. Deletion of Kdm8 in mouse cardiomyocytes increased H3K36me2 with activation of Tbx15 and repression of target genes in the NAD+ pathway before dilated cardiomyopathy initiated. NAD+ supplementation prevented dilated cardiomyopathy in Kdm8 mutant mice, and TBX15 overexpression blunted NAD+-activated cardiomyocyte respiration. Furthermore, KDM8 was downregulated in human hearts affected by dilated cardiomyopathy, and higher TBX15 expression defines a subgroup of affected hearts with the strongest downregulation of genes encoding mitochondrial proteins. Thus, KDM8 represses TBX15 to maintain cardiac metabolism. Our results suggest that epigenetic dysregulation of metabolic gene networks initiates myocardium deterioration toward heart failure and could underlie heterogeneity of dilated cardiomyopathy.
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Affiliation(s)
- Abdalla Ahmed
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario Canada
| | - Jibran Nehal Syed
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario Canada
| | - Lijun Chi
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
| | - Yaxu Wang
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario Canada
| | - Carmina Perez-Romero
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
| | - Dorothy Lee
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
- Department of Physiology, University of Toronto, Toronto, Ontario Canada
| | - Etri Kocaqi
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
| | - Amalia Caballero
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario Canada
| | - Jielin Yang
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
| | - Quetzalcoatl Escalante-Covarrubias
- Departamento de Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México City, México
| | - Akihiko Ishimura
- Division of Functional Genomics, Cancer Research Institute, Kanazawa University, Kanazawa, Japan
| | - Takeshi Suzuki
- Division of Functional Genomics, Cancer Research Institute, Kanazawa University, Kanazawa, Japan
| | - Lorena Aguilar-Arnal
- Departamento de Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México City, México
| | - Gerard Bryan Gonzales
- Division of Human Nutrition and Health, Wageningen University, Wageningen, Netherlands
| | - Kyoung-Han Kim
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa and University of Ottawa Heart Institute, Ottawa, Ontario Canada
| | - Paul Delgado-Olguín
- Department of Translational Medicine, The Hospital for Sick Children, Toronto, Ontario Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario Canada
- Heart & Stroke Richard Lewar Centre of Excellence, Toronto, Ontario Canada
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8
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Targeting mitochondrial impairment for the treatment of cardiovascular diseases: From hypertension to ischemia-reperfusion injury, searching for new pharmacological targets. Biochem Pharmacol 2023; 208:115405. [PMID: 36603686 DOI: 10.1016/j.bcp.2022.115405] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 12/26/2022] [Accepted: 12/28/2022] [Indexed: 01/03/2023]
Abstract
Mitochondria and mitochondrial proteins represent a group of promising pharmacological target candidates in the search of new molecular targets and drugs to counteract the onset of hypertension and more in general cardiovascular diseases (CVDs). Indeed, several mitochondrial pathways result impaired in CVDs, showing ATP depletion and ROS production as common traits of cardiac tissue degeneration. Thus, targeting mitochondrial dysfunction in cardiomyocytes can represent a successful strategy to prevent heart failure. In this context, the identification of new pharmacological targets among mitochondrial proteins paves the way for the design of new selective drugs. Thanks to the advances in omics approaches, to a greater availability of mitochondrial crystallized protein structures and to the development of new computational approaches for protein 3D-modelling and drug design, it is now possible to investigate in detail impaired mitochondrial pathways in CVDs. Furthermore, it is possible to design new powerful drugs able to hit the selected pharmacological targets in a highly selective way to rescue mitochondrial dysfunction and prevent cardiac tissue degeneration. The role of mitochondrial dysfunction in the onset of CVDs appears increasingly evident, as reflected by the impairment of proteins involved in lipid peroxidation, mitochondrial dynamics, respiratory chain complexes, and membrane polarization maintenance in CVD patients. Conversely, little is known about proteins responsible for the cross-talk between mitochondria and cytoplasm in cardiomyocytes. Mitochondrial transporters of the SLC25A family, in particular, are responsible for the translocation of nucleotides (e.g., ATP), amino acids (e.g., aspartate, glutamate, ornithine), organic acids (e.g. malate and 2-oxoglutarate), and other cofactors (e.g., inorganic phosphate, NAD+, FAD, carnitine, CoA derivatives) between the mitochondrial and cytosolic compartments. Thus, mitochondrial transporters play a key role in the mitochondria-cytosol cross-talk by leading metabolic pathways such as the malate/aspartate shuttle, the carnitine shuttle, the ATP export from mitochondria, and the regulation of permeability transition pore opening. Since all these pathways are crucial for maintaining healthy cardiomyocytes, mitochondrial carriers emerge as an interesting class of new possible pharmacological targets for CVD treatments.
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Zhao J, Li J, Li G, Chen M. The role of mitochondria-associated membranes mediated ROS on NLRP3 inflammasome in cardiovascular diseases. Front Cardiovasc Med 2022; 9:1059576. [PMID: 36588561 PMCID: PMC9794868 DOI: 10.3389/fcvm.2022.1059576] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 11/01/2022] [Indexed: 12/15/2022] Open
Abstract
Reactive oxygen species (ROS) metabolism is essential for the homeostasis of cells. Appropriate production of ROS is an important signaling molecule, but excessive ROS production can damage cells. ROS and ROS-associated proteins can act as damage associated molecular pattern molecules (DAMPs) to activate the NACHT, LRR, and PYD domains-containing protein 3 (NLRP3) inflammasome in cardiovascular diseases. Previous studies have shown that there are connected sites, termed mitochondria-associated membranes (MAMs), between mitochondria and the endoplasmic reticulum. In cardiovascular disease progression, MAMs play multiple roles, the most important of which is the ability to mediate ROS generation, which further activates the NLPR3 inflammasome, exacerbating the progression of disease. In this review, the following topics will be covered: 1. Molecular structures on MAMs that can mediate ROS generation; 2. Specific mechanisms of molecule-mediated ROS generation and the molecules' roles in cardiovascular disease, 3. The effects of MAMs-mediated ROS on the NLRP3 inflammasome in cardiovascular disease. The purpose of this review is to provide a basis for subsequent clinical treatment development.
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Affiliation(s)
- Jiahao Zhao
- Laboratory of Heart Valve Disease, West China Hospital, Sichuan University, Chengdu, China,Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, China
| | - Junli Li
- Laboratory of Heart Valve Disease, West China Hospital, Sichuan University, Chengdu, China
| | - Guoyong Li
- Laboratory of Heart Valve Disease, West China Hospital, Sichuan University, Chengdu, China,Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, China,Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Mao Chen
- Laboratory of Heart Valve Disease, West China Hospital, Sichuan University, Chengdu, China,Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China,*Correspondence: Mao Chen
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10
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Schwartz B, Gjini P, Gopal DM, Fetterman JL. Inefficient Batteries in Heart Failure: Metabolic Bottlenecks Disrupting the Mitochondrial Ecosystem. JACC Basic Transl Sci 2022; 7:1161-1179. [PMID: 36687274 PMCID: PMC9849281 DOI: 10.1016/j.jacbts.2022.03.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 03/25/2022] [Accepted: 03/29/2022] [Indexed: 02/01/2023]
Abstract
Mitochondrial abnormalities have long been described in the setting of cardiomyopathies and heart failure (HF), yet the mechanisms of mitochondrial dysfunction in cardiac pathophysiology remain poorly understood. Many studies have described HF as an energy-deprived state characterized by a decline in adenosine triphosphate production, largely driven by impaired oxidative phosphorylation. However, impairments in oxidative phosphorylation extend beyond a simple decline in adenosine triphosphate production and, in fact, reflect pervasive metabolic aberrations that cannot be fully appreciated from the isolated, often siloed, interrogation of individual aspects of mitochondrial function. With the application of broader and deeper examinations into mitochondrial and metabolic systems, recent data suggest that HF with preserved ejection fraction is likely metabolically disparate from HF with reduced ejection fraction. In our review, we introduce the concept of the mitochondrial ecosystem, comprising intricate systems of metabolic pathways and dynamic changes in mitochondrial networks and subcellular locations. The mitochondrial ecosystem exists in a delicate balance, and perturbations in one component often have a ripple effect, influencing both upstream and downstream cellular pathways with effects enhanced by mitochondrial genetic variation. Expanding and deepening our vantage of the mitochondrial ecosystem in HF is critical to identifying consistent metabolic perturbations to develop therapeutics aimed at preventing and improving outcomes in HF.
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Key Words
- ADP, adenosine diphosphate
- ANT1, adenine translocator 1
- ATP, adenosine triphosphate
- CVD, cardiovascular disease
- DCM, dilated cardiomyopathy
- DRP-1, dynamin-related protein 1
- EET, epoxyeicosatrienoic acid
- FADH2/FAD, flavin adenine dinucleotide
- HETE, hydroxyeicosatetraenoic acid
- HF, heart failure
- HFpEF, heart failure with preserved ejection fraction
- HFrEF, heart failure with reduced ejection fraction
- HIF1α, hypoxia-inducible factor 1α
- LV, left ventricle
- LVAD, left ventricular assist device
- LVEF, left ventricular ejection fraction
- NADH/NAD+, nicotinamide adenine dinucleotide
- OPA1, optic atrophy protein 1
- OXPHOS, oxidative phosphorylation
- PGC1-α, peroxisome proliferator-activated receptor gamma coactivator 1 alpha
- SIRT1-7, sirtuins 1-7
- cardiomyopathy
- heart failure
- iPLA2γ, Ca2+-independent mitochondrial phospholipase
- mPTP, mitochondrial permeability transition pore
- metabolism
- mitochondria
- mitochondrial ecosystem
- mtDNA, mitochondrial DNA
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Affiliation(s)
- Brian Schwartz
- Evans Department of Medicine, Section of Internal Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Petro Gjini
- Evans Department of Medicine, Section of Internal Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Deepa M Gopal
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Jessica L Fetterman
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts, USA
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11
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Flam E, Jang C, Murashige D, Yang Y, Morley MP, Jung S, Kantner DS, Pepper H, Bedi KC, Brandimarto J, Prosser BL, Cappola T, Snyder NW, Rabinowitz JD, Margulies KB, Arany Z. Integrated landscape of cardiac metabolism in end-stage human nonischemic dilated cardiomyopathy. NATURE CARDIOVASCULAR RESEARCH 2022; 1:817-829. [PMID: 36776621 PMCID: PMC9910091 DOI: 10.1038/s44161-022-00117-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 07/08/2022] [Indexed: 01/03/2023]
Abstract
Heart failure (HF) is a leading cause of mortality. Failing hearts undergo profound metabolic changes, but a comprehensive evaluation in humans is lacking. We integrate plasma and cardiac tissue metabolomics of 678 metabolites, genome-wide RNA-sequencing, and proteomic studies to examine metabolic status in 87 explanted human hearts from 39 patients with end-stage HF compared with 48 nonfailing donors. We confirm bioenergetic defects in human HF and reveal selective depletion of adenylate purines required for maintaining ATP levels. We observe substantial reductions in fatty acids and acylcarnitines in failing tissue, despite plasma elevations, suggesting defective import of fatty acids into cardiomyocytes. Glucose levels, in contrast, are elevated. Pyruvate dehydrogenase, which gates carbohydrate oxidation, is de-repressed, allowing increased lactate and pyruvate burning. Tricarboxylic acid cycle intermediates are significantly reduced. Finally, bioactive lipids are profoundly reprogrammed, with marked reductions in ceramides and elevations in lysoglycerophospholipids. These data unveil profound metabolic abnormalities in human failing hearts.
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Affiliation(s)
- Emily Flam
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
| | - Cholsoon Jang
- Department of Chemistry and Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ, USA
- Department of Biological Chemistry, University of California Irvine, Irvine, CA, USA
| | - Danielle Murashige
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
| | - Yifan Yang
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
| | - Michael P. Morley
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
| | - Sunhee Jung
- Department of Biological Chemistry, University of California Irvine, Irvine, CA, USA
| | - Daniel S. Kantner
- Center for Metabolic Disease Research, Department of Cardiovascular Science, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Hannah Pepper
- Center for Metabolic Disease Research, Department of Cardiovascular Science, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Kenneth C. Bedi
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
| | - Jeff Brandimarto
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
| | - Benjamin L. Prosser
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
- Department of Physiology, Pennsylvania Muscle Institute, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Thomas Cappola
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
| | - Nathaniel W. Snyder
- Center for Metabolic Disease Research, Department of Cardiovascular Science, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Joshua D. Rabinowitz
- Department of Chemistry and Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ, USA
| | - Kenneth B. Margulies
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
| | - Zolt Arany
- Perelman School of Medicine, Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
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12
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Zarrouk S, Finsterer J, Mehri S, Ourda F, Ben Arab S, Boussada R. Dilated Cardiomyopathy due to the Novel MT-CYB Missense Mutation m.14757T>C. J Med Cases 2021; 12:455-459. [PMID: 34804306 PMCID: PMC8577615 DOI: 10.14740/jmc3787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 10/13/2021] [Indexed: 12/03/2022] Open
Abstract
Mitochondrial DNA (mtDNA) mutations frequently manifest with multisystem disease, including cardiomyopathy (CM). Various studies described mutations in protein-encoding mtDNA genes, such as cytochrome-b, manifesting with CM. A detailed clinical, biochemical, and molecular genetic analysis was performed in a 40-year-old male with dilated CM (DCM) to detect the underlying mtDNA defect. Muscle biopsy showed complex-III deficiency, and sequencing of the cytochrome-b gene revealed the pathogenic variant m.14757T>C in MT-CYB, resulting in the replacement of the hydrophobic methionine by the polar threonine (M4T). By application of the PolyPhen algorithm the variant was predicted as pathogenic. The mutation was not found in 100 healthy controls and never reported as a neutral polymorphism despite extensive sequencing of the cytochrome-b gene in 2,704 normal healthy controls from different ethnic backgrounds. In conclusion, the novel variant m.14757T>C in MT-CYB is associated with DCM suggesting a pathophysiologic role of the variant in the development of DCM.
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Affiliation(s)
- Sinda Zarrouk
- Department of Genetic and Molecular Epidemiology, Medical University of Tunis, Tunisia
| | - Josef Finsterer
- City Hospital Landstrasse, Messerli Institute, Vienna, Austria
| | - Sounira Mehri
- Department of Genetic and Molecular Epidemiology, Medical University of Tunis, Tunisia
| | - Fatma Ourda
- Department of Functional Cardiology, La Rabta Hospital of Tunis, Tunisia
| | - Saida Ben Arab
- Department of Genetic and Molecular Epidemiology, Medical University of Tunis, Tunisia
| | - Raafik Boussada
- Department of Functional Cardiology, La Rabta Hospital of Tunis, Tunisia
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13
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Du H, Zhao Y, Li H, Wang DW, Chen C. Roles of MicroRNAs in Glucose and Lipid Metabolism in the Heart. Front Cardiovasc Med 2021; 8:716213. [PMID: 34368265 PMCID: PMC8339264 DOI: 10.3389/fcvm.2021.716213] [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: 05/28/2021] [Accepted: 06/21/2021] [Indexed: 12/22/2022] Open
Abstract
MicroRNAs (miRNAs) are small non-coding RNAs that participate in heart development and pathological processes mainly by silencing gene expression. Overwhelming evidence has suggested that miRNAs were involved in various cardiovascular pathological processes, including arrhythmias, ischemia-reperfusion injuries, dysregulation of angiogenesis, mitochondrial abnormalities, fibrosis, and maladaptive remodeling. Various miRNAs could regulate myocardial contractility, vascular proliferation, and mitochondrial function. Meanwhile, it was reported that miRNAs could manipulate nutrition metabolism, especially glucose and lipid metabolism, by regulating insulin signaling pathways, energy substrate transport/metabolism. Recently, increasing studies suggested that the abnormal glucose and lipid metabolism were closely associated with a broad spectrum of cardiovascular diseases (CVDs). Therefore, maintaining glucose and lipid metabolism homeostasis in the heart might be beneficial to CVD patients. In this review, we summarized the present knowledge of the functions of miRNAs in regulating cardiac glucose and lipid metabolism, as well as highlighted the miRNA-based therapies targeting cardiac glucose and lipid metabolism.
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Affiliation(s)
- Hengzhi Du
- Division of Cardiology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Tongji Medical College, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
| | - Yanru Zhao
- Division of Cardiology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Tongji Medical College, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
| | - Huaping Li
- Division of Cardiology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Tongji Medical College, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
| | - Dao Wen Wang
- Division of Cardiology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Tongji Medical College, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
| | - Chen Chen
- Division of Cardiology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Tongji Medical College, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
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14
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Gesper M, Nonnast ABH, Kumowski N, Stoehr R, Schuett K, Marx N, Kappel BA. Gut-Derived Metabolite Indole-3-Propionic Acid Modulates Mitochondrial Function in Cardiomyocytes and Alters Cardiac Function. Front Med (Lausanne) 2021; 8:648259. [PMID: 33829028 PMCID: PMC8019752 DOI: 10.3389/fmed.2021.648259] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 02/19/2021] [Indexed: 12/11/2022] Open
Abstract
Background: The gut microbiome has been linked to the onset of cardiometabolic diseases, in part facilitated through gut microbiota-dependent metabolites such as trimethylamine-N-oxide. However, molecular pathways associated to heart failure mediated by microbial metabolites remain largely elusive. Mitochondria play a pivotal role in cellular energy metabolism and mitochondrial dysfunction has been associated to heart failure pathogenesis. Aim of the current study was to evaluate the impact of gut-derived metabolites on mitochondrial function in cardiomyocytes via an in vitro screening approach. Methods: Based on a systematic Medline research, 25 microbial metabolites were identified and screened for their metabolic impact with a focus on mitochondrial respiration in HL-1 cardiomyocytes. Oxygen consumption rate in response to different modulators of the respiratory chain were measured by a live-cell metabolic assay platform. For one of the identified metabolites, indole-3-propionic acid, studies on specific mitochondrial complexes, cytochrome c, fatty acid oxidation, mitochondrial membrane potential, and reactive oxygen species production were performed. Mitochondrial function in response to this metabolite was further tested in human hepatic and endothelial cells. Additionally, the effect of indole-3-propionic acid on cardiac function was studied in isolated perfused hearts of C57BL/6J mice. Results: Among the metabolites examined, microbial tryptophan derivative indole-3-propionic acid could be identified as a modulator of mitochondrial function in cardiomyocytes. While acute treatment induced enhancement of maximal mitochondrial respiration (+21.5 ± 7.8%, p < 0.05), chronic exposure led to mitochondrial dysfunction (-18.9 ± 9.1%; p < 0.001) in cardiomyocytes. The latter effect of indole-3-propionic acids could also be observed in human hepatic and endothelial cells. In isolated perfused mouse hearts, indole-3-propionic acid was dose-dependently able to improve cardiac contractility from +26.8 ± 11.6% (p < 0.05) at 1 μM up to +93.6 ± 14.4% (p < 0.001) at 100 μM. Our mechanistic studies on indole-3-propionic acids suggest potential involvement of fatty acid oxidation in HL-1 cardiomyocytes. Conclusion: Our data indicate a direct impact of microbial metabolites on cardiac physiology. Gut-derived metabolite indole-3-propionic acid was identified as mitochondrial modulator in cardiomyocytes and altered cardiac function in an ex vivo mouse model.
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Affiliation(s)
- Maren Gesper
- Department of Internal Medicine 1, University Hospital Aachen, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Alena B H Nonnast
- Department of Internal Medicine 1, University Hospital Aachen, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Nina Kumowski
- Department of Internal Medicine 1, University Hospital Aachen, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Robert Stoehr
- Department of Internal Medicine 1, University Hospital Aachen, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Katharina Schuett
- Department of Internal Medicine 1, University Hospital Aachen, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Nikolaus Marx
- Department of Internal Medicine 1, University Hospital Aachen, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Ben A Kappel
- Department of Internal Medicine 1, University Hospital Aachen, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
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15
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Zhou H, Ren J, Toan S, Mui D. Role of mitochondrial quality surveillance in myocardial infarction: From bench to bedside. Ageing Res Rev 2021; 66:101250. [PMID: 33388396 DOI: 10.1016/j.arr.2020.101250] [Citation(s) in RCA: 135] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/10/2020] [Accepted: 12/22/2020] [Indexed: 12/17/2022]
Abstract
Myocardial infarction (MI) is the irreversible death of cardiomyocyte secondary to prolonged lack of oxygen or fresh blood supply. Historically considered as merely cardiomyocyte powerhouse that manufactures ATP and other metabolites, mitochondrion is recently being identified as a signal regulator that is implicated in the crosstalk and signal integration of cardiomyocyte contraction, metabolism, inflammation, and death. Mitochondria quality surveillance is an integrated network system modifying mitochondrial structure and function through the coordination of various processes including mitochondrial fission, fusion, biogenesis, bioenergetics, proteostasis, and degradation via mitophagy. Mitochondrial fission favors the elimination of depolarized mitochondria through mitophagy, whereas mitochondrial fusion preserves the mitochondrial network upon stress through integration of two or more small mitochondria into an interconnected phenotype. Mitochondrial biogenesis represents a regenerative program to replace old and damaged mitochondria with new and healthy ones. Mitochondrial bioenergetics is regulated by a metabolic switch between glucose and fatty acid usage, depending on oxygen availability. To maintain the diversity and function of mitochondrial proteins, a specialized protein quality control machinery regulates protein dynamics and function through the activity of chaperones and proteases, and induction of the mitochondrial unfolded protein response. In this review, we provide an overview of the molecular mechanisms governing mitochondrial quality surveillance and highlight the most recent preclinical and clinical therapeutic approaches to restore mitochondrial fitness during both MI and post-MI heart failure.
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Affiliation(s)
- Hao Zhou
- Department of Cardiology, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing 100853, China.
| | - Jun Ren
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA
| | - Sam Toan
- Department of Chemical Engineering, University of Minnesota-Duluth, Duluth, MN 55812, USA
| | - David Mui
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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16
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Gao P, Yan Z, Zhu Z. Mitochondria-Associated Endoplasmic Reticulum Membranes in Cardiovascular Diseases. Front Cell Dev Biol 2020; 8:604240. [PMID: 33240899 PMCID: PMC7680862 DOI: 10.3389/fcell.2020.604240] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 10/21/2020] [Indexed: 12/20/2022] Open
Abstract
The endoplasmic reticulum (ER) and mitochondria are physically connected to form dedicated structural domains known as mitochondria-associated ER membranes (MAMs), which participate in fundamental biological processes, including lipid and calcium (Ca2+) homeostasis, mitochondrial dynamics and other related cellular behaviors such as autophagy, ER stress, inflammation and apoptosis. Many studies have proved the importance of MAMs in maintaining the normal function of both organelles, and the abnormal amount, structure or function of MAMs is related to the occurrence of cardiovascular diseases. Here, we review the knowledge regarding the components of MAMs according to their different functions and the specific roles of MAMs in cardiovascular physiology and pathophysiology, focusing on some highly prevalent cardiovascular diseases, including ischemia-reperfusion, diabetic cardiomyopathy, heart failure, pulmonary arterial hypertension and systemic vascular diseases. Finally, we summarize the possible mechanisms of MAM in cardiovascular diseases and put forward some obstacles in the understanding of MAM function we may encounter.
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Affiliation(s)
- Peng Gao
- Department of Hypertension and Endocrinology, Chongqing Institute of Hypertension, Daping Hospital, Army Medical University, Chongqing, China
| | - Zhencheng Yan
- Department of Hypertension and Endocrinology, Chongqing Institute of Hypertension, Daping Hospital, Army Medical University, Chongqing, China
| | - Zhiming Zhu
- Department of Hypertension and Endocrinology, Chongqing Institute of Hypertension, Daping Hospital, Army Medical University, Chongqing, China
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17
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Sharma S, Bhattarai S, Ara H, Sun G, St Clair DK, Bhuiyan MS, Kevil C, Watts MN, Dominic P, Shimizu T, McCarthy KJ, Sun H, Panchatcharam M, Miriyala S. SOD2 deficiency in cardiomyocytes defines defective mitochondrial bioenergetics as a cause of lethal dilated cardiomyopathy. Redox Biol 2020; 37:101740. [PMID: 33049519 PMCID: PMC7559509 DOI: 10.1016/j.redox.2020.101740] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 09/01/2020] [Accepted: 09/23/2020] [Indexed: 12/21/2022] Open
Abstract
Electrophilic aldehyde (4-hydroxynonenal; 4-HNE), formed after lipid peroxidation, is a mediator of mitochondrial dysfunction and implicated in both the pathogenesis and the progression of cardiovascular disease. Manganese superoxide dismutase (MnSOD), a nuclear-encoded antioxidant enzyme, catalyzes the dismutation of superoxide radicals (O2•-) in mitochondria. To study the role of MnSOD in the myocardium, we generated a cardiomyocyte-specific SOD2 (SOD2Δ) deficient mouse strain. Unlike global SOD2 knockout mice, SOD2Δ mice reached adolescence; however, they die at ~4 months of age due to heart failure. Ultrastructural analysis of SOD2Δ hearts revealed altered mitochondrial architecture, with prominent disruption of the cristae and vacuole formation. Noninvasive echocardiographic measurements in SOD2Δ mice showed dilated cardiomyopathic features such as decreased ejection fraction and fractional shortening along with increased left ventricular internal diameter. An increased incidence of ventricular tachycardia was observed during electrophysiological studies of the heart in SOD2Δ mice. Oxidative phosphorylation (OXPHOS) measurement using a Seahorse XF analyzer in SOD2Δ neonatal cardiomyocytes and adult cardiac mitochondria displayed reduced O2 consumption, particularly during basal conditions and after the addition of FCCP (H+ ionophore/uncoupler), compared to that in SOD2fl hearts. Measurement of extracellular acidification (ECAR) to examine glycolysis in these cells showed a pattern precisely opposite that of the oxygen consumption rate (OCR) among SOD2Δ mice compared to their SOD2fl littermates. Analysis of the activity of the electron transport chain complex identified a reduction in Complex I and Complex V activity in SOD2Δ compared to SOD2fl mice. We demonstrated that a deficiency of SOD2 increases reactive oxygen species (ROS), leading to subsequent overproduction of 4-HNE inside mitochondria. Mechanistically, proteins in the mitochondrial respiratory chain complex and TCA cycle (NDUFS2, SDHA, ATP5B, and DLD) were the target of 4-HNE adduction in SOD2Δ hearts. Our findings suggest that the SOD2 mediated 4-HNE signaling nexus may play an important role in cardiomyopathy.
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Affiliation(s)
- Sudha Sharma
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Susmita Bhattarai
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Hosne Ara
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Grace Sun
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Daret K St Clair
- Department of Toxicology and Cancer Biology, College of Medicine, University of Kentucky, Lexington, KY, USA
| | - Md Shenuarin Bhuiyan
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Christopher Kevil
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Megan N Watts
- Division of Cardiology, Department of Medicine, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Paari Dominic
- Division of Cardiology, Department of Medicine, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Takahiko Shimizu
- National Center for Geriatrics and Gerontology, 7-430, Morioka, Obu Aichi, Japan
| | - Kevin J McCarthy
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Hong Sun
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Manikandan Panchatcharam
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA.
| | - Sumitra Miriyala
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA.
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18
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Bayona-Bafaluy MP, Iglesias E, López-Gallardo E, Emperador S, Pacheu-Grau D, Labarta L, Montoya J, Ruiz-Pesini E. Genetic aspects of the oxidative phosphorylation dysfunction in dilated cardiomyopathy. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2020; 786:108334. [PMID: 33339579 DOI: 10.1016/j.mrrev.2020.108334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 08/19/2020] [Accepted: 08/20/2020] [Indexed: 12/27/2022]
Abstract
Dilated cardiomyopathy is a frequent and extremely heterogeneous medical condition. Deficits in the oxidative phosphorylation system have been described in patients suffering from dilated cardiomyopathy. Hence, mutations in proteins related to this biochemical pathway could be etiological factors for some of these patients. Here, we review the clinical phenotypes of patients harboring pathological mutations in genes related to the oxidative phosphorylation system, either encoded in the mitochondrial or in the nuclear genome, presenting with dilated cardiomyopathy. In addition to the clinical heterogeneity of these patients, the large genetic heterogeneity has contributed to an improper allocation of pathogenicity for many candidate mutations. We suggest criteria to avoid incorrect assignment of pathogenicity to newly found mutations and discuss possible therapies targeting the oxidative phosphorylation function.
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Affiliation(s)
- M Pilar Bayona-Bafaluy
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain.
| | - Eldris Iglesias
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain.
| | - Ester López-Gallardo
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain.
| | - Sonia Emperador
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain.
| | - David Pacheu-Grau
- Department of Cellular Biochemistry, University Medical Center, Georg-August University,Humboldtalle, 23., 37073, Göttingen, Germany.
| | - Lorenzo Labarta
- Unidad de Cuidados Intensivos, Hospital San Jorge, Av. Martínez de Velasco, 36., 22004, Huesca, Spain.
| | - Julio Montoya
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain.
| | - Eduardo Ruiz-Pesini
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain; Fundación ARAID, Av. de Ranillas, 1-D., 50018, Zaragoza, Spain.
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19
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Histone Deacetylase Inhibitor Suberoylanilide Hydroxamic Acid Improves Energetic Status and Cardiomyogenic Differentiation of Human Dilated Myocardium-Derived Primary Mesenchymal Cells. Int J Mol Sci 2020; 21:ijms21144845. [PMID: 32650632 PMCID: PMC7402340 DOI: 10.3390/ijms21144845] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 07/03/2020] [Accepted: 07/05/2020] [Indexed: 02/08/2023] Open
Abstract
Background. In this study the effect of histone deacetylase (HDAC) inhibitor suberoylanilide hydroxamic acid (SAHA) on the energetic status and cardiomyogenic differentiation of human healthy and dilated myocardium-derived mesenchymal stromal cells (hmMSC) have been investigated. Methods. The hmMSC were isolated from the healthy and dilated post-operation heart biopsies by explant outgrowth method. Cell proliferation, HDAC activity, mitochondrial membrane potential, and level of adenosine triphosphate (ATP) were evaluated. The effect of SAHA on mitochondrial parameters has been investigated also by Seahorse XF analyzer and cardiomyogenic differentiation was confirmed by the expression of transcription factor NK2 Homeobox 5 (Nkx2.5), cardiac troponin T and alpha cardiac actin at gene and protein levels. Results. Dilated myocardium-derived hmMSC had almost 1.5 folds higher HDAC activity compared to the healthy cells and significantly lower mitochondrial membrane potential and ATP level. HDAC class I and II inhibitor SAHA improved energetic status of mitochondria in dilated myocardium-isolated hmMSC and increased expression of cardiac specific proteins during 14 days of exposure of cells to SAHA. Conclusions. HDAC inhibitor SAHA can be a promising therapeutic for dilated cardiomyopathy (DCM). Dilated hmMSC exposed to SAHA improved energetic status and, subsequently, cardiomyogenic differentiation. Data suggest that human dilated myocardium-derived MSC still have cardio tissue regenerative potential, which might be stimulated by HDAC inhibitors.
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20
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Diaz-Vegas A, Sanchez-Aguilera P, Krycer JR, Morales PE, Monsalves-Alvarez M, Cifuentes M, Rothermel BA, Lavandero S. Is Mitochondrial Dysfunction a Common Root of Noncommunicable Chronic Diseases? Endocr Rev 2020; 41:5807952. [PMID: 32179913 PMCID: PMC7255501 DOI: 10.1210/endrev/bnaa005] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Accepted: 03/12/2020] [Indexed: 12/19/2022]
Abstract
Mitochondrial damage is implicated as a major contributing factor for a number of noncommunicable chronic diseases such as cardiovascular diseases, cancer, obesity, and insulin resistance/type 2 diabetes. Here, we discuss the role of mitochondria in maintaining cellular and whole-organism homeostasis, the mechanisms that promote mitochondrial dysfunction, and the role of this phenomenon in noncommunicable chronic diseases. We also review the state of the art regarding the preclinical evidence associated with the regulation of mitochondrial function and the development of current mitochondria-targeted therapeutics to treat noncommunicable chronic diseases. Finally, we give an integrated vision of how mitochondrial damage is implicated in these metabolic diseases.
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Affiliation(s)
- Alexis Diaz-Vegas
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Charles Perkins Centre, School of Life and Environmental Sciences, The University of Sydney, Camperdown, Sydney, NSW, Australia
| | - Pablo Sanchez-Aguilera
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - James R Krycer
- Charles Perkins Centre, School of Life and Environmental Sciences, The University of Sydney, Camperdown, Sydney, NSW, Australia
| | - Pablo E Morales
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Matías Monsalves-Alvarez
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Institute of Nutrition and Food Technology (INTA), Universidad de Chile, Santiago, Chile
| | - Mariana Cifuentes
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Institute of Nutrition and Food Technology (INTA), Universidad de Chile, Santiago, Chile.,Center for Studies of Exercise, Metabolism and Cancer (CEMC), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Beverly A Rothermel
- Department of Internal Medicine (Cardiology Division), University of Texas Southwestern Medical Center, Dallas, Texas
| | - Sergio Lavandero
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Department of Internal Medicine (Cardiology Division), University of Texas Southwestern Medical Center, Dallas, Texas.,Center for Studies of Exercise, Metabolism and Cancer (CEMC), Facultad de Medicina, Universidad de Chile, Santiago, Chile
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21
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Ramachandra CJA, Chua J, Cong S, Kp MMJ, Shim W, Wu JC, Hausenloy DJ. Human-induced pluripotent stem cells for modelling metabolic perturbations and impaired bioenergetics underlying cardiomyopathies. Cardiovasc Res 2020; 117:694-711. [PMID: 32365198 DOI: 10.1093/cvr/cvaa125] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 03/23/2020] [Accepted: 04/24/2020] [Indexed: 12/17/2022] Open
Abstract
Normal cardiac contractile and relaxation functions are critically dependent on a continuous energy supply. Accordingly, metabolic perturbations and impaired mitochondrial bioenergetics with subsequent disruption of ATP production underpin a wide variety of cardiac diseases, including diabetic cardiomyopathy, dilated cardiomyopathy, hypertrophic cardiomyopathy, anthracycline cardiomyopathy, peripartum cardiomyopathy, and mitochondrial cardiomyopathies. Crucially, there are no specific treatments for preventing the onset or progression of these cardiomyopathies to heart failure, one of the leading causes of death and disability worldwide. Therefore, new treatments are needed to target the metabolic disturbances and impaired mitochondrial bioenergetics underlying these cardiomyopathies in order to improve health outcomes in these patients. However, investigation of the underlying mechanisms and the identification of novel therapeutic targets have been hampered by the lack of appropriate animal disease models. Furthermore, interspecies variation precludes the use of animal models for studying certain disorders, whereas patient-derived primary cell lines have limited lifespan and availability. Fortunately, the discovery of human-induced pluripotent stem cells has provided a promising tool for modelling cardiomyopathies via human heart tissue in a dish. In this review article, we highlight the use of patient-derived iPSCs for studying the pathogenesis underlying cardiomyopathies associated with metabolic perturbations and impaired mitochondrial bioenergetics, as the ability of iPSCs for self-renewal and differentiation makes them an ideal platform for investigating disease pathogenesis in a controlled in vitro environment. Continuing progress will help elucidate novel mechanistic pathways, and discover novel therapies for preventing the onset and progression of heart failure, thereby advancing a new era of personalized therapeutics for improving health outcomes in patients with cardiomyopathy.
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Affiliation(s)
- Chrishan J A Ramachandra
- National Heart Research Institute Singapore, National Heart Centre Singapore, 5 Hospital Drive, Singapore 169609, Singapore.,Cardiovascular and Metabolic Disorders Programme, Duke-NUS Medical School, 8 College Road, Singapore 169857, Singapore
| | - Jasper Chua
- National Heart Research Institute Singapore, National Heart Centre Singapore, 5 Hospital Drive, Singapore 169609, Singapore.,Faculty of Science, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore
| | - Shuo Cong
- National Heart Research Institute Singapore, National Heart Centre Singapore, 5 Hospital Drive, Singapore 169609, Singapore.,Department of Cardiac Surgery, Zhongshan Hospital, Fudan University, 111 Yixueyuan Road, Xuhui District, Shanghai 200032, China
| | - Myu Mai Ja Kp
- National Heart Research Institute Singapore, National Heart Centre Singapore, 5 Hospital Drive, Singapore 169609, Singapore
| | - Winston Shim
- Health and Social Sciences Cluster, Singapore Institute of Technology, 10 Dover Drive, Singapore 138683, Singapore
| | - Joseph C Wu
- Cardiovascular Institute, Stanford University School of Medicine, 265 Campus Drive, Stanford, CA 94305, USA.,Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA.,Department of Medicine, Stanford University, Stanford, CA 94305, USA.,Department of Radiology, Stanford University, Stanford, CA 94305, USA
| | - Derek J Hausenloy
- National Heart Research Institute Singapore, National Heart Centre Singapore, 5 Hospital Drive, Singapore 169609, Singapore.,Cardiovascular and Metabolic Disorders Programme, Duke-NUS Medical School, 8 College Road, Singapore 169857, Singapore.,Yong Loo Lin Medical School, National University of Singapore, 10 Medical Drive, Singapore 11759, Singapore.,The Hatter Cardiovascular Institute, University College London, 67 Chenies Mews, Bloomsbury, London WC1E 6HX, UK.,Cardiovascular Research Centre, College of Medical and Health Sciences, Asia University, No. 500, Liufeng Road, Wufeng District, Taichung City 41354,Taiwan
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22
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Chaanine AH, Joyce LD, Stulak JM, Maltais S, Joyce DL, Dearani JA, Klaus K, Nair KS, Hajjar RJ, Redfield MM. Mitochondrial Morphology, Dynamics, and Function in Human Pressure Overload or Ischemic Heart Disease With Preserved or Reduced Ejection Fraction. Circ Heart Fail 2019; 12:e005131. [PMID: 30744415 DOI: 10.1161/circheartfailure.118.005131] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND The FOXO3a (forkhead box O3a)-BNIP3 (B-cell lymphoma 2/adenovirus E1B 19kDa interacting protein 3) pathway modulates mitochondrial dynamics and function and contributes to myocardial remodeling in rodent models of heart failure. We sought to investigate the expression of this pathway along with the expression of mitochondrial biogenesis (PGC-1α [peroxisome proliferator-activated receptor-γ coactivator-1α]), dynamics (DRP-1 [dynamin-related protein 1], OPA-1 [optic atrophy 1], and MFN 2 [mitofusin 2]), and oxidative phosphorylation (citrate synthase and electron transport chain complexes) markers and COX IV (cytochrome C oxidase) activity in myocardium from patients with valvular or ischemic heart disease and heart failure with preserved ejection fraction (HFpEF) or heart failure with reduced ejection fraction (HFrEF). METHODS AND RESULTS Subepicardial left ventricular biopsies (10×1×1 mm3) were obtained at aortic valve replacement (HFpEFAVR, n=5; and HFrEFAVR, n=4), coronary artery bypass grafting (HFpEFCABG, n=5; and HFrEFCABG, n=5), or left ventricular assist device implantation (HFrEFLVAD, n=4). Subepicardial biopsies from patients with normal left ventricular function (n=2) and from donor hearts (n=3) served as controls (normal). Relative to normal, mitochondrial fragmentation and cristae destruction were evident, and mitochondrial area was decreased in HFpEF; 1.00±0.09 versus 0.71±0.08; P=0.016. These mitochondrial morphological changes were more pronounced in HFrEF (0.54±0.06); P=0.002 HFpEF versus HFrEF. BNIP3 (monomer+dimer) expression was increased in HFpEF (3.99±2.44) and in HFrEF (5.19±1.70) relative to normal; P=0.004 and P<0.001, respectively. However, BNIP3 monomer was increased in HFrEF (4.32±1.43) compared with normal (0.99±0.06) and HFpEF (1.97±0.90); P=0.001 and 0.004, respectively. The HFrEF group uniquely showed increase in DRP-1 expression (1.94±0.38) and decreases in PGC-1α expression (0.61±0.07) and COX IV activity (0.70±0.10) relative to normal; P=0.013, P<0.001, and P<0.001, respectively, with no significant change in electron transport chain complexes expression. CONCLUSIONS These findings in human myocardium confirm studies in rodents where contractile dysfunction is associated with activation of the FOXO3a-BNIP3 pathway and altered mitochondrial dynamics, biogenesis, and function.
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Affiliation(s)
- Antoine H Chaanine
- Department of Cardiovascular Diseases, (A.H.C., M.M.R.), Mayo Clinic, Rochester, MN
| | - Lyle D Joyce
- Division of Cardiothoracic Surgery, Froedtert and the Medical College of Wisconsin, Milwaukee (L.D.J., D.L.J.)
| | - John M Stulak
- Department of Cardiothoracic Surgery (J.M.S., S.M., J.A.D.), Mayo Clinic, Rochester, MN
| | - Simon Maltais
- Department of Cardiothoracic Surgery (J.M.S., S.M., J.A.D.), Mayo Clinic, Rochester, MN
| | - David L Joyce
- Division of Cardiothoracic Surgery, Froedtert and the Medical College of Wisconsin, Milwaukee (L.D.J., D.L.J.)
| | - Joseph A Dearani
- Department of Cardiothoracic Surgery (J.M.S., S.M., J.A.D.), Mayo Clinic, Rochester, MN
| | - Katherine Klaus
- Division of Endocrinology (K.K., K.S.N.), Mayo Clinic, Rochester, MN
| | | | - Roger J Hajjar
- Department of Cardiovascular Diseases, Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY (R.J.H.)
| | - Margaret M Redfield
- Department of Cardiovascular Diseases, (A.H.C., M.M.R.), Mayo Clinic, Rochester, MN
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23
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The Involvement of Cytochrome c Oxidase in Mitochondrial Fusion in Primary Cultures of Neonatal Rat Cardiomyocytes. Cardiovasc Toxicol 2019; 18:365-373. [PMID: 29396798 DOI: 10.1007/s12012-018-9447-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Cytochrome c oxidase (CCO) is a copper-dependent enzyme of mitochondrial respiratory chain. In pressure overload-induced cardiac hypertrophy, copper level and CCO activity are both depressed, along with disturbance in mitochondrial fusion and fission dynamics. Copper repletion leads to recovery of CCO activity and normalized mitochondrial dynamics. The present study was undertaken to define the link between CCO activity and mitochondrial dynamic changes. Primary cultures of neonatal rat cardiomyocytes were treated with phenylephrine to induce cell hypertrophy. Hypertrophic cardiomyocytes were then treated with copper to reverse hypertrophy. In the hypertrophic cardiomyocytes, CCO activity was depressed and mitochondrial fusion was suppressed. Upon copper repletion, CCO activity was recovered and mitochondrial fusion was reestablished. Depression of CCO activity by siRNA targeting CCO assembly homolog 17 (COX17), a copper chaperone for CCO, led to fragmentation of mitochondria, which was not recoverable by copper supplementation. This study thus demonstrates that copper-dependent CCO is critical for mitochondrial fusion in the regression of cardiomyocyte hypertrophy.
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24
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Vogt S, Ruppert V, Pankuweit S, Paletta JPJ, Rhiel A, Weber P, Irqsusi M, Cybulski P, Ramzan R. Myocardial insufficiency is related to reduced subunit 4 content of cytochrome c oxidase. J Cardiothorac Surg 2018; 13:95. [PMID: 30223867 PMCID: PMC6142347 DOI: 10.1186/s13019-018-0785-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 09/11/2018] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Treatment of heart failure remains one of the most challenging task for intensive care medicine, cardiology and cardiac surgery. New options and better indicators are always required. Understanding the basic mechanisms underlying heart failure promote the development of adjusted therapy e.g. assist devices and monitoring of recovery. If cardiac failure is related to compromised cellular respiration of the heart, remains unclear. Myocardial respiration depends on Cytochrome c- Oxidase (CytOx) activity representing the rate limiting step for the mitochondrial respiratory chain. The enzymatic activity as well as mRNA expression of enzyme's mitochondrial encoded catalytic subunit 2, nuclear encoded regulatory subunit 4 and protein contents were studied in biopsies of cardiac patients suffering from myocardial insufficiency and dilated cardiomyopathy (DCM). METHODS Fifty-four patients were enrolled in the study and underwent coronary angiography. Thirty male patients (mean age: 45 +/- 15 yrs.) had a reduced ejection fraction (EF) 35 ± 12% below 45% and a left ventricular end diastolic diameter (LVEDD) of 71 ± 10 mm bigger than 56 mm. They were diagnosed as having idiopathic dilated cardiomyopathy (DCM) without coronary heart disease and NYHA-class 3 and 4. Additionally, 24 male patients (mean age: 52 +/- 11 yrs.) after exclusion of secondary cardiomyopathies, coronary artery or valve disease, served as control (EF: 68 ± 7, LVEDD: 51 ± 7 mm). Total RNA was extracted from two biopsies of each person. Real-time PCR analysis was performed with specific primers followed by a melt curve analysis. Corresponding protein expression in the tissue was studied with immune-histochemistry while enzymatic activity was evaluated by spectroscopy. RESULTS Gene and protein expression analysis of patients showed a significant decrease of subunit 4 (1.1 vs. 0.6, p < 0.001; 7.7 ± 3.1% vs. 2.8 ± 1.4%, p < 0.0001) but no differences in subunit 2. Correlations were found between reduced subunit 2 expression, low EF (r = 0.766, p < 0.00045) and increased LVEDD (r = 0.492, p < 0.0068). In case of DCM less subunit 4 expression and reduced shortening fraction (r = 0.524, p < 0.017) was found, but enzymatic activity was higher (0.08 ± 0.06 vs. 0.26 ± 0.08 U/mg, p < 0.001) although myocardial oxygen consumption continued to the same extent. CONCLUSION In case of myocardial insufficiency and DCM, decreased expression of COX 4 results in an impaired CytOx activity. Higher enzymatic activity but equal oxygen consumption contribute to the pathophysiology of the myocardial insufficiency and appears as an indicator of oxidative stress. This kind of dysregulation should be in the focus for the development of diagnostic and therapy procedures.
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Affiliation(s)
- Sebastian Vogt
- Cardiovascular Research Laboratories at the Biochemical Pharmacological Center, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany. .,Heart Surgery, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany.
| | - Volker Ruppert
- Department for Internal Medicine- Cardiology, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany
| | - Sabine Pankuweit
- Department for Internal Medicine- Cardiology, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany
| | - Jürgen P J Paletta
- Clinic for Orthopedics and Rheumatology, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany
| | - Annika Rhiel
- Cardiovascular Research Laboratories at the Biochemical Pharmacological Center, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany
| | - Petra Weber
- Cardiovascular Research Laboratories at the Biochemical Pharmacological Center, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany
| | - Marc Irqsusi
- Heart Surgery, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany
| | - Pia Cybulski
- Cardiovascular Research Laboratories at the Biochemical Pharmacological Center, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany
| | - Rabia Ramzan
- Cardiovascular Research Laboratories at the Biochemical Pharmacological Center, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany.,Heart Surgery, Philipps-University Marburg and Universitätsklinikum Gießen and Marburg GmbH, Marburg, Germany
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25
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Lopez-Crisosto C, Pennanen C, Vasquez-Trincado C, Morales PE, Bravo-Sagua R, Quest AFG, Chiong M, Lavandero S. Sarcoplasmic reticulum-mitochondria communication in cardiovascular pathophysiology. Nat Rev Cardiol 2017; 14:342-360. [PMID: 28275246 DOI: 10.1038/nrcardio.2017.23] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Repetitive, calcium-mediated contractile activity renders cardiomyocytes critically dependent on a sustained energy supply and adequate calcium buffering, both of which are provided by mitochondria. Moreover, in vascular smooth muscle cells, mitochondrial metabolism modulates cell growth and proliferation, whereas cytosolic calcium levels regulate the arterial vascular tone. Physical and functional communication between mitochondria and sarco/endoplasmic reticulum and balanced mitochondrial dynamics seem to have a critical role for optimal calcium transfer to mitochondria, which is crucial in calcium homeostasis and mitochondrial metabolism in both types of muscle cells. Moreover, mitochondrial dysfunction has been associated with myocardial damage and dysregulation of vascular smooth muscle proliferation. Therefore, sarco/endoplasmic reticulum-mitochondria coupling and mitochondrial dynamics are now viewed as relevant factors in the pathogenesis of cardiac and vascular diseases, including coronary artery disease, heart failure, and pulmonary arterial hypertension. In this Review, we summarize the evidence related to the role of sarco/endoplasmic reticulum-mitochondria communication in cardiac and vascular muscle physiology, with a focus on how perturbations contribute to the pathogenesis of cardiovascular disorders.
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Affiliation(s)
- Camila Lopez-Crisosto
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Quimicas y Farmaceuticas &Facultad de Medicina, Universidad de Chile, Sergio Livingstone 1007, Santiago 8380492, Chile
| | - Christian Pennanen
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Quimicas y Farmaceuticas &Facultad de Medicina, Universidad de Chile, Sergio Livingstone 1007, Santiago 8380492, Chile
| | - Cesar Vasquez-Trincado
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Quimicas y Farmaceuticas &Facultad de Medicina, Universidad de Chile, Sergio Livingstone 1007, Santiago 8380492, Chile
| | - Pablo E Morales
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Quimicas y Farmaceuticas &Facultad de Medicina, Universidad de Chile, Sergio Livingstone 1007, Santiago 8380492, Chile
| | - Roberto Bravo-Sagua
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Quimicas y Farmaceuticas &Facultad de Medicina, Universidad de Chile, Sergio Livingstone 1007, Santiago 8380492, Chile.,Instituto de Nutricion y Tecnologia de los Alimentos (INTA), Universidad de Chile, Avenida El Líbano 5524, Santiago 7830490, Chile
| | - Andrew F G Quest
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Quimicas y Farmaceuticas &Facultad de Medicina, Universidad de Chile, Sergio Livingstone 1007, Santiago 8380492, Chile.,Centro de Estudios Moleculares de la Celula (CEMC), Instituto de Ciencias Biomedicas, Facultad de Medicina, Universidad de Chile, Independencia 1027, Santiago 8380453, Chile
| | - Mario Chiong
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Quimicas y Farmaceuticas &Facultad de Medicina, Universidad de Chile, Sergio Livingstone 1007, Santiago 8380492, Chile
| | - Sergio Lavandero
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Quimicas y Farmaceuticas &Facultad de Medicina, Universidad de Chile, Sergio Livingstone 1007, Santiago 8380492, Chile.,Centro de Estudios Moleculares de la Celula (CEMC), Instituto de Ciencias Biomedicas, Facultad de Medicina, Universidad de Chile, Independencia 1027, Santiago 8380453, Chile.,Department of Internal Medicine (Cardiology Division), University of Texas Southwestern Medical Center, 6000 Harry Hines Boulevard, Dallas, Texas 75235, USA
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26
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Pinti MV, Hathaway QA, Hollander JM. Role of microRNA in metabolic shift during heart failure. Am J Physiol Heart Circ Physiol 2016; 312:H33-H45. [PMID: 27742689 DOI: 10.1152/ajpheart.00341.2016] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 10/07/2016] [Accepted: 10/08/2016] [Indexed: 12/16/2022]
Abstract
Heart failure (HF) is an end point resulting from a number of disease states. The prognosis for HF patients is poor with survival rates precipitously low. Energy metabolism is centrally linked to the development of HF, and it involves the proteomic remodeling of numerous pathways, many of which are targeted to the mitochondrion. microRNAs (miRNA) are noncoding RNAs that influence posttranscriptional gene regulation. miRNA have garnered considerable attention for their ability to orchestrate changes to the transcriptome, and ultimately the proteome, during HF. Recently, interest in the role played by miRNA in the regulation of energy metabolism at the mitochondrion has emerged. Cardiac proteome remodeling during HF includes axes impacting hypertrophy, oxidative stress, calcium homeostasis, and metabolic fuel transition. Although it is established that the pathological environment of hypoxia and hemodynamic stress significantly contribute to the HF phenotype, it remains unclear as to the mechanistic underpinnings driving proteome remodeling. The aim of this review is to present evidence highlighting the role played by miRNA in these processes as a means for linking pathological stimuli with proteomic alteration. The differential expression of proteins of substrate transport, glycolysis, β-oxidation, ketone metabolism, the citric acid cycle (CAC), and the electron transport chain (ETC) are paralleled by the differential expression of miRNA species that modulate these processes. Identification of miRNAs that translocate to cardiomyocyte mitochondria (miR-181c, miR-378) influencing the expression of the mitochondrial genome-encoded transcripts as well as suggested import modulators are discussed. Current insights, applications, and challenges of miRNA-based therapeutics are also described.
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Affiliation(s)
- Mark V Pinti
- Division of Exercise Physiology, West Virginia University School of Medicine, Morgantown, West Virginia; and Mitochondria, Metabolism, and Bioenergentics Working Group, Morgantown, West Virginia
| | - Quincy A Hathaway
- Division of Exercise Physiology, West Virginia University School of Medicine, Morgantown, West Virginia; and Mitochondria, Metabolism, and Bioenergentics Working Group, Morgantown, West Virginia
| | - John M Hollander
- Division of Exercise Physiology, West Virginia University School of Medicine, Morgantown, West Virginia; and Mitochondria, Metabolism, and Bioenergentics Working Group, Morgantown, West Virginia
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27
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Melenovsky V, Petrak J, Mracek T, Benes J, Borlaug BA, Nuskova H, Pluhacek T, Spatenka J, Kovalcikova J, Drahota Z, Kautzner J, Pirk J, Houstek J. Myocardial iron content and mitochondrial function in human heart failure: a direct tissue analysis. Eur J Heart Fail 2016; 19:522-530. [PMID: 27647766 DOI: 10.1002/ejhf.640] [Citation(s) in RCA: 174] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 05/13/2016] [Accepted: 07/29/2016] [Indexed: 11/08/2022] Open
Abstract
AIMS Iron replacement improves clinical status in iron-deficient patients with heart failure (HF), but the pathophysiology is poorly understood. Iron is essential not only for erythropoiesis, but also for cellular bioenergetics. The impact of myocardial iron deficiency (MID) on mitochondrial function, measured directly in the failing human heart, is unknown. METHODS AND RESULTS Left ventricular samples were obtained from 91 consecutive HF patients undergoing transplantation and 38 HF-free organ donors (controls). Total myocardial iron content, mitochondrial respiration, citric acid cycle and respiratory chain enzyme activities, respiratory chain components (complex I-V), and protein content of reactive oxygen species (ROS)-protective enzymes were measured in tissue homogenates to quantify mitochondrial function. Myocardial iron content was lower in HF compared with controls (156 ± 41 vs. 200 ± 38 µg·g-1 dry weight, P < 0.001), independently of anaemia. MID (the lowest iron tercile in HF) was associated with more extensive coronary disease and less beta-blocker usage compared with non-MID HF patients. Compared with controls, HF patients displayed reduced myocardial oxygen2 respiration and reduced activity of all examined mitochondrial enzymes (all P < 0.001). MID in HF was associated with preserved activity of respiratory chain enzymes but reduced activity of aconitase and citrate synthase (by -26% and -15%, P < 0.05) and reduced expression of catalase, glutathione peroxidase, and superoxide dismutase 2. CONCLUSION Myocardial iron content is decreased and mitochondrial functions are impaired in advanced HF. MID in HF is associated with diminished citric acid cycle enzyme activities and decreased ROS-protecting enzymes. MID may contribute to altered myocardial substrate use and to worsening of mitochondrial dysfunction that exists in HF.
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Affiliation(s)
- Vojtech Melenovsky
- Department of Cardiology and Cardiac Surgery, Institute of Clinical and Experimental Medicine-IKEM, Prague, Czech Republic
| | - Jiri Petrak
- Department of Pathological Physiology and BIOCEV, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Tomas Mracek
- Department of Bioenergetics, Institute of Physiology, Academy of Sciences, Prague, Czech Republic
| | - Jan Benes
- Department of Cardiology and Cardiac Surgery, Institute of Clinical and Experimental Medicine-IKEM, Prague, Czech Republic
| | - Barry A Borlaug
- Department of Cardiovascular Diseases, Mayo Clinic, Rochester, MN, USA
| | - Hana Nuskova
- Department of Bioenergetics, Institute of Physiology, Academy of Sciences, Prague, Czech Republic
| | - Tomas Pluhacek
- Department of Analytical Chemistry and RCPTM, Faculty of Science, Palacky University, Olomouc, Czech Republic
| | - Jaroslav Spatenka
- Department of Transplantation and Tissue Bank, University Hospital in Motol, Prague, Czech Republic
| | - Jana Kovalcikova
- Department of Bioenergetics, Institute of Physiology, Academy of Sciences, Prague, Czech Republic
| | - Zdenek Drahota
- Department of Bioenergetics, Institute of Physiology, Academy of Sciences, Prague, Czech Republic
| | - Josef Kautzner
- Department of Cardiology and Cardiac Surgery, Institute of Clinical and Experimental Medicine-IKEM, Prague, Czech Republic
| | - Jan Pirk
- Department of Cardiology and Cardiac Surgery, Institute of Clinical and Experimental Medicine-IKEM, Prague, Czech Republic
| | - Josef Houstek
- Department of Bioenergetics, Institute of Physiology, Academy of Sciences, Prague, Czech Republic
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28
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Sheeran FL, Pepe S. Posttranslational modifications and dysfunction of mitochondrial enzymes in human heart failure. Am J Physiol Endocrinol Metab 2016; 311:E449-60. [PMID: 27406740 DOI: 10.1152/ajpendo.00127.2016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 06/28/2016] [Indexed: 11/22/2022]
Abstract
Deficiency of energy supply is a major complication contributing to the syndrome of heart failure (HF). Because the concurrent activity profile of mitochondrial bioenergetic enzymes has not been studied collectively in human HF, our aim was to examine the mitochondrial enzyme defects in left ventricular myocardium obtained from explanted end-stage failing hearts. Compared with nonfailing donor hearts, activity rates of complexes I and IV and the Krebs cycle enzymes isocitrate dehydrogenase, malate dehydrogenase, and aconitase were lower in HF, as determined spectrophotometrically. However, activity rates of complexes II and III and citrate synthase did not differ significantly between the two groups. Protein expression, determined by Western blotting, did not differ between the groups, implying posttranslational perturbation. In the face of diminished total glutathione and coenzyme Q10 levels, oxidative modification was explored as an underlying cause of enzyme dysfunction. Of the three oxidative modifications measured, protein carbonylation was increased significantly by 31% in HF (P < 0.01; n = 18), whereas levels of 4-hydroxynonenal and protein nitration, although elevated, did not differ. Isolation of complexes I and IV and F1FoATP synthase by immunocapture revealed that proteins containing iron-sulphur or heme redox centers were targets of oxidative modification. Energy deficiency in end-stage failing human left ventricle involves impaired activity of key electron transport chain and Krebs cycle enzymes without altered expression of protein levels. Augmented oxidative modification of crucial enzyme subunit structures implicates dysfunction due to diminished capacity for management of mitochondrial reactive oxygen species, thus contributing further to reduced bioenergetics in human HF.
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Affiliation(s)
- Freya L Sheeran
- Heart Research, Clinical Sciences, Murdoch Children's Research Institute, and Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Melbourne, Australia; and Department of Surgery at Alfred Hospital, Monash University, Melbourne, Australia
| | - Salvatore Pepe
- Heart Research, Clinical Sciences, Murdoch Children's Research Institute, and Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Melbourne, Australia; and Department of Surgery at Alfred Hospital, Monash University, Melbourne, Australia
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29
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Shi J, Dai W, Hale SL, Brown DA, Wang M, Han X, Kloner RA. Bendavia restores mitochondrial energy metabolism gene expression and suppresses cardiac fibrosis in the border zone of the infarcted heart. Life Sci 2015; 141:170-8. [PMID: 26431885 DOI: 10.1016/j.lfs.2015.09.022] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 09/02/2015] [Accepted: 09/29/2015] [Indexed: 12/31/2022]
Abstract
AIMS We have observed that Bendavia, a mitochondrial-targeting peptide that binds the phospholipid cardiolipin and stabilizes the components of electron transport and ATP generation, improves cardiac function and prevents left ventricular remodeling in a 6week rat myocardial infarction (MI) model. We hypothesized that Bendavia restores mitochondrial biogenesis and gene expression, suppresses cardiac fibrosis, and preserves sarco/endoplasmic reticulum (SERCA2a) level in the noninfarcted border zone of infarcted hearts. MAIN METHODS Starting 2h after left coronary artery ligation, rats were randomized to receive Bendavia (3mg/kg/day), water or sham operation. At 6weeks, PCR array and qRT-PCR was performed to detect gene expression. Picrosirius red staining was used to analyze collagen deposition. KEY FINDINGS There was decreased expression of 70 out of 84 genes related to mitochondrial energy metabolism in the border zone of untreated hearts. This down-regulation was largely reversed by Bendavia treatment. Downregulated mitochondrial biogenesis and glucose & fatty acid (FA) oxidation related genes were restored by administration of Bendavia. Matrix metalloproteinase (MMP9) and tissue inhibitor of metalloproteinase (TIMP1) gene expression were significantly increased in the border zone of untreated hearts. Bendavia completely prevented up-regulation of MMP9, but maintained TIMP1 gene expression. Picrosirius red staining demonstrated that Bendavia suppressed collagen deposition within border zone. In addition, Bendavia showed a trend toward restoring SERCA2a expression. SIGNIFICANCE Bendavia restored expression of mitochondrial energy metabolism related genes, prevented myocardial matrix remodeling and preserved SERCA2a expression in the noninfarcted border, which may have contributed to the preservation of cardiac structure and function.
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Affiliation(s)
- Jianru Shi
- Huntington Medical Research Institutes, Pasadena, CA, United States; Heart Institute, Good Samaritan Hospital, Los Angeles, CA, United States; Division of Cardiovascular Medicine of the Keck School of Medicine, University of Southern California, Los Angeles, CA, United States.
| | - Wangde Dai
- Huntington Medical Research Institutes, Pasadena, CA, United States; Heart Institute, Good Samaritan Hospital, Los Angeles, CA, United States; Division of Cardiovascular Medicine of the Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Sharon L Hale
- Huntington Medical Research Institutes, Pasadena, CA, United States; Heart Institute, Good Samaritan Hospital, Los Angeles, CA, United States; Division of Cardiovascular Medicine of the Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - David A Brown
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, United States
| | - Miao Wang
- Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, FL, United States
| | - Xianlin Han
- Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, FL, United States
| | - Robert A Kloner
- Huntington Medical Research Institutes, Pasadena, CA, United States; Heart Institute, Good Samaritan Hospital, Los Angeles, CA, United States; Division of Cardiovascular Medicine of the Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
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Oyarzún AP, Westermeier F, Pennanen C, López-Crisosto C, Parra V, Sotomayor-Flores C, Sánchez G, Pedrozo Z, Troncoso R, Lavandero S. FK866 compromises mitochondrial metabolism and adaptive stress responses in cultured cardiomyocytes. Biochem Pharmacol 2015; 98:92-101. [PMID: 26297909 DOI: 10.1016/j.bcp.2015.08.097] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 08/17/2015] [Indexed: 01/27/2023]
Abstract
AIM FK866 is an inhibitor of the NAD(+) synthesis rate-limiting enzyme nicotinamide phosphoribosyltransferase (NAMPT). Using FK866 to target NAD(+) synthesis has been proposed as a treatment for inflammatory diseases and cancer. However, use of FK866 may pose cardiovascular risks, as NAMPT expression is decreased in various cardiomyopathies, with low NAD(+) levels playing an important role in cardiovascular disease progression. In addition, low NAD(+) levels are associated with cardiovascular risk conditions such as aging, dyslipidemia, and type II diabetes mellitus. The aim of this work was to study the effects of FK866-induced NAD(+) depletion on mitochondrial metabolism and adaptive stress responses in cardiomyocytes. METHODS AND RESULTS FK866 was used to deplete NAD(+) levels in cultured rat cardiomyocytes. Cell viability, mitochondrial metabolism, and adaptive responses to insulin, norepinephrine, and H2O2 were assessed in cardiomyocytes. The drop in NAD(+) induced by FK866 decreased mitochondrial metabolism without changing cell viability. Insulin-stimulated Akt phosphorylation, glucose uptake, and H2O2-survival were compromised by FK866. Glycolytic gene transcription was increased, whereas cardiomyocyte hypertrophy induced by norepinephrine was prevented. Restoring NAD(+) levels via nicotinamide mononucleotide administration reestablished mitochondrial metabolism and adaptive stress responses. CONCLUSION This work shows that FK866 compromises mitochondrial metabolism and the adaptive response of cardiomyocytes to norepinephrine, H2O2, and insulin.
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Affiliation(s)
- Alejandra P Oyarzún
- Advanced Center for Chronic Disease (ACCDiS) and Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Francisco Westermeier
- Advanced Center for Chronic Disease (ACCDiS) and Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Christian Pennanen
- Advanced Center for Chronic Disease (ACCDiS) and Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Camila López-Crisosto
- Advanced Center for Chronic Disease (ACCDiS) and Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Valentina Parra
- Advanced Center for Chronic Disease (ACCDiS) and Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Cristian Sotomayor-Flores
- Advanced Center for Chronic Disease (ACCDiS) and Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Gina Sánchez
- Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Zully Pedrozo
- Advanced Center for Chronic Disease (ACCDiS) and Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile; Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Rodrigo Troncoso
- Advanced Center for Chronic Disease (ACCDiS) and Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile; Instituto de Nutrición y Tecnología de los Alimentos (INTA), Universidad de Chile, Santiago, Chile.
| | - Sergio Lavandero
- Advanced Center for Chronic Disease (ACCDiS) and Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile; Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile; Department of Internal Medicine (Cardiology Division), University of Texas Southwestern Medical Center, Dallas, Texas, USA.
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Marin-Garcia J, Goldenthal MJ. Mitochondrial DNA defects in cardiomyopathy. Cardiovasc Pathol 2015; 7:205-13. [PMID: 25851396 DOI: 10.1016/s1054-8807(97)00101-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/1997] [Accepted: 10/16/1997] [Indexed: 10/16/2022] Open
Abstract
Abnormalities in mitochondrial DNA (mtDNA) including specific deletions and point mutations have been found in an increasing number of cases of both dilated and hypertrophic cardiomyopathy. The role that these mutations may play in contributing to the cardiomyopathic phenotype is discussed in this survey of the recent literature.
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Affiliation(s)
- J Marin-Garcia
- The Molecular Cardiology Institute, Highland Park, New Jersey USA
| | - M J Goldenthal
- The Molecular Cardiology Institute, Highland Park, New Jersey USA
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Vijay V, Han T, Moland CL, Kwekel JC, Fuscoe JC, Desai VG. Sexual dimorphism in the expression of mitochondria-related genes in rat heart at different ages. PLoS One 2015; 10:e0117047. [PMID: 25615628 PMCID: PMC4304718 DOI: 10.1371/journal.pone.0117047] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 12/18/2014] [Indexed: 12/12/2022] Open
Abstract
Cardiovascular disease (CVD) is the leading cause of mortality worldwide. Moreover, sex and age are considered major risk factors in the development of CVDs. Mitochondria are vital for normal cardiac function, and regulation of mitochondrial structure and function may impact susceptibility to CVD. To identify potential role of mitochondria in sex-related differences in susceptibility to CVD, we analyzed the basal expression levels of mitochondria-related genes in the hearts of male and female rats. Whole genome expression profiling was performed in the hearts of young (8-week), adult (21-week), and old (78-week) male and female Fischer 344 rats and the expression of 670 unique genes related to various mitochondrial functions was analyzed. A significant (p<0.05) sexual dimorphism in expression levels of 46, 114, and 41 genes was observed in young, adult and old rats, respectively. Gene Ontology analysis revealed the influence of sex on various biological pathways related to cardiac energy metabolism at different ages. The expression of genes involved in fatty acid metabolism was significantly different between the sexes in young and adult rat hearts. Adult male rats also showed higher expression of genes associated with the pyruvate dehydrogenase complex compared to females. In young and adult hearts, sexual dimorphism was not noted in genes encoding oxidative phosphorylation. In old rats, however, a majority of genes involved in oxidative phosphorylation had higher expression in females compared to males. Such basal differences between the sexes in cardiac expression of genes associated with energy metabolism may indicate a likely involvement of mitochondria in susceptibility to CVDs. In addition, female rats showed lower expression levels of apoptotic genes in hearts compared to males at all ages, which may have implications for better preservation of cardiac mass in females than in males.
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Affiliation(s)
- Vikrant Vijay
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, United States of America
| | - Tao Han
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, United States of America
| | - Carrie L. Moland
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, United States of America
| | - Joshua C. Kwekel
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, United States of America
| | - James C. Fuscoe
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, United States of America
| | - Varsha G. Desai
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, United States of America
- * E-mail:
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Zheng L, Han P, Liu J, Li R, Yin W, Wang T, Zhang W, Kang YJ. Role of copper in regression of cardiac hypertrophy. Pharmacol Ther 2014; 148:66-84. [PMID: 25476109 DOI: 10.1016/j.pharmthera.2014.11.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 11/17/2014] [Indexed: 02/07/2023]
Abstract
Pressure overload causes an accumulation of homocysteine in the heart, which is accompanied by copper depletion through the formation of copper-homocysteine complexes and the excretion of the complexes. Copper supplementation recovers cytochrome c oxidase (CCO) activity and promotes myocardial angiogenesis, along with the regression of cardiac hypertrophy and the recovery of cardiac contractile function. Increased copper availability is responsible for the recovery of CCO activity. Copper promoted expression of angiogenesis factors including vascular endothelial growth factor (VEGF) in endothelial cells is responsible for angiogenesis. VEGF receptor-2 (VEGFR-2) is critical for hypertrophic growth of cardiomyocytes and VEGFR-1 is essential for the regression of cardiomyocyte hypertrophy. Copper, through promoting VEGF production and suppressing VEGFR-2, switches the VEGF signaling pathway from VEGFR-2-dependent to VEGFR-1-dependent, leading to the regression of cardiomyocyte hypertrophy. Copper is also required for hypoxia-inducible factor-1 (HIF-1) transcriptional activity, acting on the interaction between HIF-1 and the hypoxia responsible element and the formation of HIF-1 transcriptional complex by inhibiting the factor inhibiting HIF-1. Therefore, therapeutic targets for copper supplementation-induced regression of cardiac hypertrophy include: (1) the recovery of copper availability for CCO and other critical cellular events; (2) the activation of HIF-1 transcriptional complex leading to the promotion of angiogenesis in the endothelial cells by VEGF and other factors; (3) the activation of VEGFR-1-dependent regression signaling pathway in the cardiomyocytes; and (4) the inhibition of VEGFR-2 through post-translational regulation in the hypertrophic cardiomyocytes. Future studies should focus on target-specific delivery of copper for the development of clinical application.
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Affiliation(s)
- Lily Zheng
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China
| | - Pengfei Han
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China
| | - Jiaming Liu
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China
| | - Rui Li
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China
| | - Wen Yin
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China
| | - Tao Wang
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China
| | - Wenjing Zhang
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China
| | - Y James Kang
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY 40292, USA.
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Pennanen C, Parra V, López-Crisosto C, Morales PE, Del Campo A, Gutierrez T, Rivera-Mejías P, Kuzmicic J, Chiong M, Zorzano A, Rothermel BA, Lavandero S. Mitochondrial fission is required for cardiomyocyte hypertrophy mediated by a Ca2+-calcineurin signaling pathway. J Cell Sci 2014; 127:2659-71. [PMID: 24777478 PMCID: PMC4058110 DOI: 10.1242/jcs.139394] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 03/20/2014] [Indexed: 12/12/2022] Open
Abstract
Cardiomyocyte hypertrophy has been associated with diminished mitochondrial metabolism. Mitochondria are crucial organelles for the production of ATP, and their morphology and function are regulated by the dynamic processes of fusion and fission. The relationship between mitochondrial dynamics and cardiomyocyte hypertrophy is still poorly understood. Here, we show that treatment of cultured neonatal rat cardiomyocytes with the hypertrophic agonist norepinephrine promotes mitochondrial fission (characterized by a decrease in mitochondrial mean volume and an increase in the relative number of mitochondria per cell) and a decrease in mitochondrial function. We demonstrate that norepinephrine acts through α1-adrenergic receptors to increase cytoplasmic Ca(2+), activating calcineurin and promoting migration of the fission protein Drp1 (encoded by Dnml1) to mitochondria. Dominant-negative Drp1 (K38A) not only prevented mitochondrial fission, it also blocked hypertrophic growth of cardiomyocytes in response to norepinephrine. Remarkably, an antisense adenovirus against the fusion protein Mfn2 (AsMfn2) was sufficient to increase mitochondrial fission and stimulate a hypertrophic response without agonist treatment. Collectively, these results demonstrate the importance of mitochondrial dynamics in the development of cardiomyocyte hypertrophy and metabolic remodeling.
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Affiliation(s)
- Christian Pennanen
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile
| | - Valentina Parra
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile Department of Internal Medicine (Cardiology Division), University of Texas Southwestern Medical Center, Dallas, TX 75235, USA
| | - Camila López-Crisosto
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile
| | - Pablo E Morales
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile
| | - Andrea Del Campo
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile
| | - Tomás Gutierrez
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile
| | - Pablo Rivera-Mejías
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile
| | - Jovan Kuzmicic
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile
| | - Mario Chiong
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile
| | - Antonio Zorzano
- Institute for Research in Biomedicine (IRB), 08028 Barcelona, Spain Departamento de Bioquímica í Biología molecular, Facultat de Biología, Universitat de Barcelona, Barcelona, Spain CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Instituto de Salud Carlos III, Spain
| | - Beverly A Rothermel
- Department of Internal Medicine (Cardiology Division), University of Texas Southwestern Medical Center, Dallas, TX 75235, USA
| | - Sergio Lavandero
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile, Santiago 8380492, Chile Centro Estudios Moleculares de la Celula, Facultad Ciencias Quimicas y Farmaceuticas & Facultad Medicina, Universidad de Chile, Santiago 8380492, Chile Department of Internal Medicine (Cardiology Division), University of Texas Southwestern Medical Center, Dallas, TX 75235, USA
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Drp1 Loss-of-function Reduces Cardiomyocyte Oxygen Dependence Protecting the Heart From Ischemia-reperfusion Injury. J Cardiovasc Pharmacol 2014; 63:477-87. [DOI: 10.1097/fjc.0000000000000071] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Abstract
Heart failure (HF) is a complex chronic clinical syndrome. Energy deficit is considered to be a key contributor to the development of both cardiac and skeletal myopathy. In HF, several components of cardiac and skeletal muscle bioenergetics are altered, such as oxygen availability, substrate oxidation, mitochondrial ATP production, and ATP transfer to the contractile apparatus via the creatine kinase shuttle. This review focuses on alterations in mitochondrial biogenesis and respirasome organization, substrate oxidation coupled with ATP synthesis in the context of their contribution to the chronic energy deficit, and mechanical dysfunction of the cardiac and skeletal muscle in HF. We conclude that HF is associated with decreased mitochondrial biogenesis and function in both heart and skeletal muscle, supporting the concept of a systemic mitochondrial cytopathy. The sites of mitochondrial defects are located within the electron transport and phosphorylation apparatus and differ with the etiology and progression of HF in the two mitochondrial populations (subsarcolemmal and interfibrillar) of cardiac and skeletal muscle. The roles of adrenergic stimulation, the renin-angiotensin system, and cytokines are evaluated as factors responsible for the systemic energy deficit. We propose a cyclic AMP-mediated mechanism by which increased adrenergic stimulation contributes to the mitochondrial dysfunction.
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Abstract
Normal cardiac function requires high and continuous supply with ATP. As mitochondria are the major source of ATP production, it is apparent that mitochondrial function and cardiac function need to be closely related to each other. When subjected to overload, the heart hypertrophies. Initially, the development of hypertrophy is a compensatory mechanism, and contractile function is maintained. However, when the heart is excessively and/or persistently stressed, cardiac function may deteriorate, leading to the onset of heart failure. There is considerable evidence that alterations in mitochondrial function are involved in the decompensation of cardiac hypertrophy. Here, we review metabolic changes occurring at the mitochondrial level during the development of cardiac hypertrophy and the transition to heart failure. We will focus on changes in mitochondrial substrate metabolism, the electron transport chain and the role of oxidative stress. We will demonstrate that, with respect to mitochondrial adaptations, a clear distinction between hypertrophy and heart failure cannot be made because most of the findings present in overt heart failure can already be found in the various stages of hypertrophy.
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Abstract
The global epidemic of cardiovascular disease remains the leading cause of death in the USA and across the world. Functional and structural integrity of mitochondria are essential for the physiological function of the cardiovascular system. The metabolic adaptation observed in normal heart is lost in the failing myocardium, which becomes progressively energy depleted leading to impaired myocardial contraction and relaxation. Uncoupling of electron transfer from ATP synthesis leads to excess generation of reactive species, leading to widespread cellular injury and cardiovascular disease. Accumulation of mitochondrial DNA mutation has been linked to ischaemic heart disease, cardiomyopathy and atherosclerotic vascular disease. Mitochondria are known to regulate apoptotic and autophagic pathways that have been shown to play an important role in the development of cardiomyopathy and atherosclerosis. A number of pharmacological and non-pharmacological treatment options have been explored in the management of mitochondrial diseases with variable success.
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Affiliation(s)
- Elizabeth A Dominic
- The George Washington School of Medicine, , Washington, District of Columbia, USA
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Cordero-Reyes AM, Gupte AA, Youker KA, Loebe M, Hsueh WA, Torre-Amione G, Taegtmeyer H, Hamilton DJ. Freshly isolated mitochondria from failing human hearts exhibit preserved respiratory function. J Mol Cell Cardiol 2014; 68:98-105. [PMID: 24412531 DOI: 10.1016/j.yjmcc.2013.12.029] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 12/19/2013] [Accepted: 12/31/2013] [Indexed: 12/20/2022]
Abstract
In heart failure mitochondrial dysfunction is thought to be responsible for energy depletion and contractile dysfunction. The difficulties in procuring fresh left ventricular (LV) myocardium from humans for assessment of mitochondrial function have resulted in the reliance on surrogate markers of mitochondrial function and limited our understanding of cardiac energetics. We isolated mitochondria from fresh LV wall tissue of patients with heart failure and reduced systolic function undergoing heart transplant or left ventricular assist device placement, and compared their function to mitochondria isolated from the non-failing LV (NFLV) wall tissue with normal systolic function from patients with pulmonary hypertension undergoing heart-lung transplant. We performed detailed mitochondrial functional analyses using 4 substrates: glutamate-malate (GM), pyruvate-malate (PM) palmitoyl carnitine-malate (PC) and succinate. NFLV mitochondria showed preserved respiratory control ratios and electron chain integrity with only few differences for the 4 substrates. In contrast, HF mitochondria had greater respiration with GM, PM and PC substrates and higher electron chain capacity for PM than for PC. Surprisingly, HF mitochondria had greater respiratory control ratios and lower ADP-independent state 4 rates than NFLV mitochondria for GM, PM and PC substrates demonstrating that HF mitochondria are capable of coupled respiration ex vivo. Gene expression studies revealed decreased expression of key genes in pathways for oxidation of both fatty acids and glucose. Our results suggest that mitochondria from the failing LV myocardium are capable of tightly coupled respiration when isolated and supplied with ample substrates. Thus energy starvation in the failing heart may be the result of dysregulation of metabolic pathways, impaired substrate supply or reduced mitochondrial number but not the result of reduced mitochondrial electron transport capacity.
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Affiliation(s)
| | - Anisha A Gupte
- Bioenergetics Program, Houston Methodist Research Institute, Weill Cornell Medical College, USA
| | - Keith A Youker
- Methodist DeBakey Heart and Vascular Institute, Weill Cornell Medical College, USA
| | - Matthias Loebe
- Methodist DeBakey Heart and Vascular Institute, Weill Cornell Medical College, USA
| | - Willa A Hsueh
- Methodist Diabetes and Metabolism Institute, Houston Methodist Research Institute, Weill Cornell Medical College, USA; Houston Methodist Hospital Department of Medicine, Weill Cornell Medical College, USA
| | - Guillermo Torre-Amione
- Methodist DeBakey Heart and Vascular Institute, Weill Cornell Medical College, USA; Catedra de Cardiologia y Medicina Vascular, Tecnologico de Monterrey, Nuevo Leon, Mexico
| | - Heinrich Taegtmeyer
- The University of Texas Medical School at Houston, Department of Internal Medicine, USA
| | - Dale J Hamilton
- Bioenergetics Program, Houston Methodist Research Institute, Weill Cornell Medical College, USA; Houston Methodist Hospital Department of Medicine, Weill Cornell Medical College, USA.
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Pathogenesis of chronic cardiorenal syndrome: is there a role for oxidative stress? Int J Mol Sci 2013; 14:23011-32. [PMID: 24264044 PMCID: PMC3856103 DOI: 10.3390/ijms141123011] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Revised: 10/30/2013] [Accepted: 11/01/2013] [Indexed: 02/07/2023] Open
Abstract
Cardiorenal syndrome is a frequently encountered clinical condition when the dysfunction of either the heart or kidneys amplifies the failure progression of the other organ. Complex biochemical, hormonal and hemodynamic mechanisms underlie the development of cardiorenal syndrome. Both in vitro and experimental studies have identified several dysregulated pathways in heart failure and in chronic kidney disease that lead to increased oxidative stress. A decrease in mitochondrial oxidative metabolism has been reported in cardiomyocytes during heart failure. This is balanced by a compensatory increase in glucose uptake and glycolysis with consequent decrease in myocardial ATP content. In the kidneys, both NADPH oxidase and mitochondrial metabolism are important sources of TGF-β1-induced cellular ROS. NOX-dependent oxidative activation of transcription factors such as NF-kB and c-jun leads to increased expression of renal target genes (phospholipaseA2, MCP-1 and CSF-1, COX-2), thus contributing to renal interstitial fibrosis and inflammation. In the present article, we postulate that, besides contributing to both cardiac and renal dysfunction, increased oxidative stress may also play a crucial role in cardiorenal syndrome development and progression. In particular, an imbalance between the renin-angiotensin-aldosterone system, the sympathetic nervous system, and inflammation may favour cardiorenal syndrome through an excessive oxidative stress production. This article also discusses novel therapeutic strategies for their potential use in the treatment of patients affected by cardiorenal syndrome.
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Rosca MG, Tandler B, Hoppel CL. Mitochondria in cardiac hypertrophy and heart failure. J Mol Cell Cardiol 2012; 55:31-41. [PMID: 22982369 DOI: 10.1016/j.yjmcc.2012.09.002] [Citation(s) in RCA: 185] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Revised: 09/01/2012] [Accepted: 09/06/2012] [Indexed: 01/19/2023]
Abstract
Heart failure (HF) frequently is the unfavorable outcome of pathological heart hypertrophy. In contrast to physiological cardiac hypertrophy, which occurs in response to exercise and leads to full adaptation of contractility to the increased wall stress, pathological hypertrophy occurs in response to volume or pressure overload, ultimately leading to contractile dysfunction and HF. Because cardiac hypertrophy impairs the relationship between ATP demand and production, mitochondrial bioenergetics must keep up with the cardiac hypertrophic phenotype. We review data regarding the mitochondrial proteomic and energetic remodeling in cardiac hypertrophy, as well as the temporal and causal relationships between mitochondrial failure to match the increased energy demand and progression to cardiac decompensation. We suggest that the maladaptive effect of sustained neuroendocrine signals on mitochondria leads to bioenergetic fading which contributes to the progression from cardiac hypertrophy to failure. This article is part of a Special Issue entitled "Focus on Cardiac Metabolism".
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Affiliation(s)
- Mariana G Rosca
- Center for Mitochondrial Diseases, School of Medicine, Case Western Reserve University, Cleveland, OH 44106‐4981, USA
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Grillon JM, Johnson KR, Kotlo K, Danziger RS. Non-histone lysine acetylated proteins in heart failure. Biochim Biophys Acta Mol Basis Dis 2011; 1822:607-14. [PMID: 22155497 DOI: 10.1016/j.bbadis.2011.11.016] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 11/21/2011] [Accepted: 11/22/2011] [Indexed: 12/26/2022]
Abstract
Both histone-acetylations and histone deacetylases have been shown to play a key role in cardiac remodeling. Recently, it has become abundantly clear that many non-histone proteins are modified by post-translational lysine acetylations and that these acetylations regulate protein activity, conformation, and binding. In the present study, non-histone acetylated proteins associated with heart failure were identified. Global screening for lysine acetylated proteins was performed using 2-dimensional gel electrophoresis coupled with immunoblotting with a primary monoclonal anti-acetyl-lysine antibody. Lysine acetylated proteins were compared in two rodent models of hypertensive heart failure, the Dahl salt-sensitive (SS) and spontaneously hypertensive heart failure prone (SHHF) rats with those in corresponding controls, i.e., the Dahl salt-resistant (SR) and W (W) rat strains, respectively. Forty-one and 66 acetylated proteins were detected in SS and SHHF failing hearts, respectively, but either not detected or detected with less abundance in corresponding control hearts. Twelve of these acetylated proteins were common to both models of heart failure. These were identified using matrix-assisted laser desorption/ionization time of flight (MALDI-TOF/TOF) mass spectrometry followed by Mascot Analysis and included mitochondrial enzymes: ATP synthase, long-chain acyl-CoA dehydrogenase, creatine kinase, malate dehydrogenase, and pyruvate dehydrogenase. The abundance of NAD-dependent deacetylase sirtuin-3 (Sirt3), a mitochondrial deacetylase was reduced in SS and SHHF failing hearts. This is the first description of non-histone protein acetylations associated with heart failure and raises the prospect that acetylations of mitochondrial proteins linked to reduced Sirt3 mediate, in part, metabolic changes in heart failure.
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Affiliation(s)
- Jean Michel Grillon
- Department of Medicine, University of Illinois at Chicago, 840 S. Wood St., Chicago, IL 60612, USA
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Edwards LM, Ashrafian H, Korzeniewski B. In silico studies on the sensitivity of myocardial PCr/ATP to changes in mitochondrial enzyme activity and oxygen concentration. MOLECULAR BIOSYSTEMS 2011; 7:3335-42. [PMID: 22025222 DOI: 10.1039/c1mb05310h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ratio of myocardial phosphocreatine (PCr)/ATP reflects the balance of energy consumption and energy supply in the heart. It is reduced in a range of important physiological conditions including during and after acute hypoxia, after a prolonged visit to high-altitude, and in those suffering from both type 2 diabetes mellitus and various forms of heart failure. Yet despite its significance, the factors underlying the reduced PCr/ATP ratio seen in heart failure remain poorly understood. Given that oxidative phosphorylation is the only viable steady-state provider of ATP in the heart, the argument has been put forward that the observed reduction in myocardial PCr/ATP in all these conditions can be accounted for by some form of mitochondrial insufficiency. Thus we used a computer model of oxidative phosphorylation, coupled with creatine kinase, to study the effects of hypoxia and mitochondrial dysfunction on myocardial PCr/ATP. In physiological normoxia, all oxidative phosphorylation complexes, NADH supply and proton leak exerted comparable (of the same order of magnitude) control over PCr/ATP, as defined within Metabolic Control Analysis (MCA). Under hypoxia, the control increased considerably for all components of the system, especially for cytochrome oxidase and mitochondrial proton leak. Hypoxia alone, without any changes in other factors, exerted a pronounced effect on PCr/ATP. Our simulations support three important ideas: First, that mitochondrial abnormalities can contribute considerably to a blunted PCr/ATP; second, that hypoxia and mitochondrial dysfunction can interact in important ways to determine the energy status of the failing heart; and third, that hypoxia alone can account for significant decreases in cardiac PCr/ATP.
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Affiliation(s)
- Lindsay M Edwards
- School of Medicine, University of Tasmania, Private Bag 34, Medical Sciences Building One, Hobart, Tasmania 7000, Australia.
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Dai DF, Hsieh EJ, Liu Y, Chen T, Beyer RP, Chin MT, MacCoss MJ, Rabinovitch PS. Mitochondrial proteome remodelling in pressure overload-induced heart failure: the role of mitochondrial oxidative stress. Cardiovasc Res 2011; 93:79-88. [PMID: 22012956 DOI: 10.1093/cvr/cvr274] [Citation(s) in RCA: 135] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
AIMS We investigate the role of mitochondrial oxidative stress in mitochondrial proteome remodelling using mouse models of heart failure induced by pressure overload. METHODS AND RESULTS We demonstrate that mice overexpressing catalase targeted to mitochondria (mCAT) attenuate pressure overload-induced heart failure. An improved method of label-free unbiased analysis of the mitochondrial proteome was applied to the mouse model of heart failure induced by transverse aortic constriction (TAC). A total of 425 mitochondrial proteins were compared between wild-type and mCAT mice receiving TAC or sham surgery. The changes in the mitochondrial proteome in heart failure included decreased abundance of proteins involved in fatty acid metabolism, an increased abundance of proteins in glycolysis, apoptosis, mitochondrial unfolded protein response and proteolysis, transcription and translational control, and developmental processes as well as responses to stimuli. Overexpression of mCAT better preserved proteins involved in fatty acid metabolism and attenuated the increases in apoptotic and proteolytic enzymes. Interestingly, gene ontology analysis also showed that monosaccharide metabolic processes and protein folding/proteolysis were only overrepresented in mCAT but not in wild-type mice in response to TAC. CONCLUSION This is the first study to demonstrate that scavenging mitochondrial reactive oxygen species (ROS) by mCAT not only attenuates most of the mitochondrial proteome changes in heart failure, but also induces a subset of unique alterations. These changes represent processes that are adaptive to the increased work and metabolic requirements of pressure overload, but which are normally inhibited by overproduction of mitochondrial ROS.
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Affiliation(s)
- Dao-Fu Dai
- Department of Pathology, University of Washington, Seattle, 98195, USA
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Nishtala K, Phong TQ, Steil L, Sauter M, Salazar MG, Kandolf R, Kroemer HK, Felix SB, Völker U, Klingel K, Hammer E. Virus‐induced dilated cardiomyopathy is characterized by increased levels of fibrotic extracellular matrix proteins and reduced amounts of energy‐producing enzymes. Proteomics 2011; 11:4310-20. [DOI: 10.1002/pmic.201100229] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 08/04/2011] [Accepted: 08/10/2011] [Indexed: 11/11/2022]
Affiliation(s)
- Krishnatej Nishtala
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst‐Moritz‐Arndt‐Universität Greifswald, Greifswald, Germany
| | - Truong Q. Phong
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst‐Moritz‐Arndt‐Universität Greifswald, Greifswald, Germany
| | - Leif Steil
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst‐Moritz‐Arndt‐Universität Greifswald, Greifswald, Germany
| | - Martina Sauter
- Abteilung Molekulare Pathologie, Universitätsklinikum Tübingen, Tübingen, Germany
| | - Manuela G. Salazar
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst‐Moritz‐Arndt‐Universität Greifswald, Greifswald, Germany
| | - Reinhard Kandolf
- Abteilung Molekulare Pathologie, Universitätsklinikum Tübingen, Tübingen, Germany
| | - Heyo K. Kroemer
- Institut für Pharmakologie, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Stephan B. Felix
- Klinik für Innere Medizin B, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Uwe Völker
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst‐Moritz‐Arndt‐Universität Greifswald, Greifswald, Germany
| | - Karin Klingel
- Abteilung Molekulare Pathologie, Universitätsklinikum Tübingen, Tübingen, Germany
| | - Elke Hammer
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst‐Moritz‐Arndt‐Universität Greifswald, Greifswald, Germany
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Lee HG, Chen Q, Wolfram JA, Richardson SL, Liner A, Siedlak SL, Zhu X, Ziats NP, Fujioka H, Felsher DW, Castellani RJ, Valencik ML, McDonald JA, Hoit BD, Lesnefsky EJ, Smith MA. Cell cycle re-entry and mitochondrial defects in myc-mediated hypertrophic cardiomyopathy and heart failure. PLoS One 2009; 4:e7172. [PMID: 19779629 PMCID: PMC2747003 DOI: 10.1371/journal.pone.0007172] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Accepted: 08/30/2009] [Indexed: 11/18/2022] Open
Abstract
While considerable evidence supports the causal relationship between increases in c-Myc (Myc) and cardiomyopathy as a part of a "fetal re-expression" pattern, the functional role of Myc in mechanisms of cardiomyopathy remains unclear. To address this, we developed a bitransgenic mouse that inducibly expresses Myc under the control of the cardiomyocyte-specific MHC promoter. In adult mice the induction of Myc expression in cardiomyocytes in the heart led to the development of severe hypertrophic cardiomyopathy followed by ventricular dysfunction and ultimately death from congestive heart failure. Mechanistically, following Myc activation, cell cycle markers and other indices of DNA replication were significantly increased suggesting that cell cycle-related events might be a primary mechanism of cardiac dysfunction. Furthermore, pathological alterations at the cellular level included alterations in mitochondrial function with dysregulation of mitochondrial biogenesis and defects in electron transport chain complexes I and III. These data are consistent with the known role of Myc in several different pathways including cell cycle activation, mitochondrial proliferation, and apoptosis, and indicate that Myc activation in cardiomyocytes is an important regulator of downstream pathological sequelae. Moreover, our findings indicate that the induction of Myc in cardiomyocytes is sufficient to cause cardiomyopathy and heart failure, and that sustained induction of Myc, leading to cell cycle re-entry in adult cardiomyocytes, represents a maladaptive response for the mature heart.
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Affiliation(s)
- Hyoung-gon Lee
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
- * E-mail: (HgL); (MAS)
| | - Qun Chen
- Department of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Julie A. Wolfram
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Sandy L. Richardson
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Anna Liner
- Department of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
- University Hospitals Case Medical Center, Cleveland, Ohio, United States of America
| | - Sandra L. Siedlak
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Xiongwei Zhu
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Nicholas P. Ziats
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Hisashi Fujioka
- Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Dean W. Felsher
- Division of Oncology, Department of Medicine and Pathology, Stanford University School of Medicine, Stanford, California, United States of America
| | - Rudy J. Castellani
- Department of Pathology, University of Maryland, Baltimore, Maryland, United States of America
| | - Maria L. Valencik
- Department of Biochemistry, University of Nevada Reno, Reno, Nevada, United States of America
| | - John A. McDonald
- Department of Biochemistry, University of Nevada Reno, Reno, Nevada, United States of America
| | - Brian D. Hoit
- Department of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
- University Hospitals Case Medical Center, Cleveland, Ohio, United States of America
| | - Edward J. Lesnefsky
- Department of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America
- Louis Stokes Cleveland DVAMC, Cleveland, Ohio, United States of America
| | - Mark A. Smith
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
- * E-mail: (HgL); (MAS)
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Burelle Y, Khairallah M, Ascah A, Allen BG, Deschepper CF, Petrof BJ, Des Rosiers C. Alterations in mitochondrial function as a harbinger of cardiomyopathy: lessons from the dystrophic heart. J Mol Cell Cardiol 2009; 48:310-21. [PMID: 19769982 DOI: 10.1016/j.yjmcc.2009.09.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Revised: 09/03/2009] [Accepted: 09/09/2009] [Indexed: 10/20/2022]
Abstract
While compelling evidence supports the central role of mitochondrial dysfunction in the pathogenesis of heart failure, there is comparatively less information available on mitochondrial alterations that occur prior to failure. Building on our recent work with the dystrophin-deficient mdx mouse heart, this review focuses on how early changes in mitochondrial functional phenotype occur prior to overt cardiomyopathy and may be a determinant for the development of adverse cardiac remodelling leading to failure. These include alterations in energy substrate utilization and signalling of cell death through increased permeability of mitochondrial membranes, which may result from abnormal calcium handling, and production of reactive oxygen species. Furthermore, we will discuss evidence supporting the notion that these alterations in the dystrophin-deficient heart may represent an early "subclinical" signature of a defective nitric oxide/cGMP signalling pathway, as well as the potential benefit of mitochondria-targeted therapies. While the mdx mouse is an animal model of Duchenne muscular dystrophy (DMD), changes in the structural integrity of dystrophin, the mutated cytoskeletal protein responsible for DMD, have also recently been implicated as a common mechanism for contractile dysfunction in heart failure. In fact, altogether our findings support a critical role for dystrophin in maintaining optimal coupling between metabolism and contraction in the heart.
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Affiliation(s)
- Yan Burelle
- Department of Kinesiology, Université de Montréal, Montreal, Quebec, Canada
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Rosca MG, Hoppel CL. New aspects of impaired mitochondrial function in heart failure. J Bioenerg Biomembr 2009; 41:107-12. [PMID: 19347572 DOI: 10.1007/s10863-009-9215-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This minireview focuses on the impairment of function in cardiac mitochondria in heart failure (HF). It is generally accepted that chronic energy starvation leads to cardiac mechanical dysfunction in HF. Mitochondria are the primary ATP generator for the heart. Current evidence suggests that the assembly of the electron transport chain (ETC) into respirasomes provides structural support for mitochondrial oxidative phosphorylation by facilitating electron channeling and perhaps by preventing electron leak and superoxide production. Defects have been purported to occur in the individual ETC complexes or components of the phosphorylation apparatus in HF, but these defects have not been linked to impaired mitochondrial function. Moreover, studies that reported decreased mitochondrial oxidative phosphorylation in HF did not identify the site of the defect. We propose a sequential mechanistic pathway in which the decrease in functional respirasomes in HF is the primary event causing decreased oxidative phosphorylation and increased reactive oxygen species production, leading to a progressive decrease in cardiac performance.
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Affiliation(s)
- Mariana G Rosca
- Center for Mitochondrial Diseases and Department of Medicine, Case Western Reserve University, Cleveland, OH, USA
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Golomb E, Nyska A, Schwalb H. Occult Cardiotoxicity—Toxic Effects on Cardiac Ischemic Tolerance. Toxicol Pathol 2009; 37:572-93. [DOI: 10.1177/0192623309339503] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The outcome of cardiac ischemic events depends not only on the extent and duration of the ischemic stimulus but also on the myocardial intrinsic tolerance to ischemic injury. Cardiac ischemic tolerance reflects myocardial functional reserves that are not always used when the tissue is appropriately oxygenated. Ischemic tolerance is modulated by ubiquitous signal transduction pathways, transcription factors and cellular enzymes, converging on the mitochondria as the main end effector. Therefore, drugs and toxins affecting these pathways may impair cardiac ischemic tolerance without affecting myocardial integrity or function in oxygenated conditions. Such effect would not be detected by current toxicological studies but would considerably influence the outcome of ischemic events. The authors refer to such effect as “occult cardiotoxicity.” In this review, the authors summarize current knowledge about main mechanisms that determine cardiac ischemic tolerance, methods to assess it, and the effects of drugs and toxins on it. The authors offer a view that low cardiac ischemic tolerance is a premorbid status and, therefore, that occult cardiotoxicity is a significant potential source of cardiac morbidity. The authors propose that toxicologic assessment of compounds would include the assessment of their effect on cardiac ischemic tolerance.
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Affiliation(s)
- Eliahu Golomb
- Department of Pathology, Shaare Zedek Medical Center, Jerusalem 91031, Israel
| | - Abraham Nyska
- Department of Pathology, Sackler School of Medicine, Tel Aviv University, Tel-Aviv 69978, Israel
| | - Herzl Schwalb
- The Joseph Lunenfeld Cardiac Surgery Research Center, Department of Cardiothoracic Surgery, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel
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