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Rudokas MW, McKay M, Toksoy Z, Eisen JN, Bögner M, Young LH, Akar FG. Mitochondrial network remodeling of the diabetic heart: implications to ischemia related cardiac dysfunction. Cardiovasc Diabetol 2024; 23:261. [PMID: 39026280 PMCID: PMC11264840 DOI: 10.1186/s12933-024-02357-1] [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: 01/17/2024] [Accepted: 07/10/2024] [Indexed: 07/20/2024] Open
Abstract
Mitochondria play a central role in cellular energy metabolism, and their dysfunction is increasingly recognized as a critical factor in the pathogenesis of diabetes-related cardiac pathophysiology, including vulnerability to ischemic events that culminate in myocardial infarction on the one hand and ventricular arrhythmias on the other. In diabetes, hyperglycemia and altered metabolic substrates lead to excessive production of reactive oxygen species (ROS) by mitochondria, initiating a cascade of oxidative stress that damages mitochondrial DNA, proteins, and lipids. This mitochondrial injury compromises the efficiency of oxidative phosphorylation, leading to impaired ATP production. The resulting energy deficit and oxidative damage contribute to functional abnormalities in cardiac cells, placing the heart at an increased risk of electromechanical dysfunction and irreversible cell death in response to ischemic insults. While cardiac mitochondria are often considered to be relatively autonomous entities in their capacity to produce energy and ROS, their highly dynamic nature within an elaborate network of closely-coupled organelles that occupies 30-40% of the cardiomyocyte volume is fundamental to their ability to exert intricate regulation over global cardiac function. In this article, we review evidence linking the dynamic properties of the mitochondrial network to overall cardiac function and its response to injury. We then highlight select studies linking mitochondrial ultrastructural alterations driven by changes in mitochondrial fission, fusion and mitophagy in promoting cardiac ischemic injury to the diabetic heart.
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Affiliation(s)
- Michael W Rudokas
- Department of Internal Medicine, Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Margaret McKay
- Department of Internal Medicine, Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, USA
- Department of Biomedical Engineering, Yale University Schools of Engineering and Applied Sciences, New Haven, CT, USA
| | - Zeren Toksoy
- Department of Internal Medicine, Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Julia N Eisen
- Department of Internal Medicine, Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Markus Bögner
- Department of Internal Medicine, Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Lawrence H Young
- Department of Internal Medicine, Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Fadi G Akar
- Department of Internal Medicine, Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, USA.
- Department of Biomedical Engineering, Yale University Schools of Engineering and Applied Sciences, New Haven, CT, USA.
- Department of Biomedical Engineering, Electro-biology and Arrhythmia Therapeutics Laboratory, Yale University Schools of Medicine, Engineering and Applied Sciences, 300 George Street, 793 - 748C, New Haven, CT, 06511, USA.
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2
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Ji L, Han H, Shan X, Zhao P, Chen H, Zhang C, Xu M, Lu R, Guo W. Ginsenoside Rb1 ameliorates lipotoxicity-induced myocardial injury in diabetes mellitus by regulating Mfn2. Eur J Pharmacol 2024; 974:176609. [PMID: 38677536 DOI: 10.1016/j.ejphar.2024.176609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 04/07/2024] [Accepted: 04/22/2024] [Indexed: 04/29/2024]
Abstract
PURPOSE Diabetic cardiomyopathy is a prevalent cardiovascular complication of diabetes mellitus. This study aimed to investigate the effects of ginsenoside Rb1 (GRb1) on the diabetic myocardium. METHODS Leptin receptor-deficient db/db mice and palmitic acid (PA)-treated cardiomyocyte models were utilized. Cardiac systolic and diastolic function, mitochondrial morphology, and respiratory chain function were determined. The expression of mitochondrial dynamics proteins was measured. Mitofusin 2 (Mfn2) overexpression and inhibition were achieved by lentiviral infection and small interfering RNA (siRNA) transfection. RESULTS In comparison to non-diabetic mice, db/db mice exhibited significant increases in body weight, blood glucose, blood lipids, and cardiac free fatty acid levels. This was accompanied by myocardial hypertrophy and left ventricular diastolic dysfunction, which were significantly ameliorated by GRb1 intervention. Stimulation with PA increased oxidative stress and apoptosis, and decreased viability in H9c2 cardiomyocytes. PA also reduced sarcomere contractility and relaxation in adult mice ventricular myocytes. PA-induced cellular and mitochondrial damage were reversed with GRb1 treatment. The cardiac tissue of db/db mice and PA-treated cardiomyocytes exhibited a decrease in Mfn2 expression, which was markedly improved by GRb1. Mfn2 overexpression reversed PA-induced mitochondrial fragmentation and functional damage in cardiomyocytes, while inhibition of Mfn2 expression by siRNA transfection blocked the protective effects of GRb1. CONCLUSION GRb1 alleviated myocardial lipid accumulation and mitochondrial injury, and attenuated ventricular diastolic dysfunction in diabetic mice. The regulation of Mfn2 was involved in the protective effects of GRb1 against lipotoxic myocardial injury.
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MESH Headings
- Animals
- Ginsenosides/pharmacology
- Ginsenosides/therapeutic use
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/metabolism
- Myocytes, Cardiac/pathology
- Diabetic Cardiomyopathies/metabolism
- Diabetic Cardiomyopathies/drug therapy
- Diabetic Cardiomyopathies/pathology
- Mice
- GTP Phosphohydrolases/metabolism
- GTP Phosphohydrolases/genetics
- Male
- Palmitic Acid/pharmacology
- Apoptosis/drug effects
- Oxidative Stress/drug effects
- Diabetes Mellitus, Experimental/complications
- Diabetes Mellitus, Experimental/drug therapy
- Diabetes Mellitus, Experimental/metabolism
- Rats
- Receptors, Leptin/genetics
- Receptors, Leptin/metabolism
- Receptors, Leptin/deficiency
- Cell Line
- Mice, Inbred C57BL
- Myocardium/pathology
- Myocardium/metabolism
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Affiliation(s)
- Louyin Ji
- School of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Hui Han
- School of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Xiaoli Shan
- School of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Pei Zhao
- School of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Huihua Chen
- School of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Chen Zhang
- Department of Pathology, School of Integrative Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Ming Xu
- Department of Physiology, School of Integrative Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Rong Lu
- School of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Wei Guo
- Department of Pathology, School of Integrative Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
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3
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Zhang F, Lin JJ, Tian HN, Wang J. Effect of exercise on improving myocardial mitochondrial function in decreasing diabetic cardiomyopathy. Exp Physiol 2024; 109:190-201. [PMID: 37845840 PMCID: PMC10988701 DOI: 10.1113/ep091309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 09/11/2023] [Indexed: 10/18/2023]
Abstract
Diabetic cardiomyopathy (DCM) is a significant cause of heart failure in patients with diabetes, and its pathogenesis is closely related to myocardial mitochondrial injury and functional disability. Studies have shown that the development of diabetic cardiomyopathy is related to disorders in mitochondrial metabolic substrates, changes in mitochondrial dynamics, an imbalance in mitochondrial Ca2+ regulation, defects in the regulation of microRNAs, and mitochondrial oxidative stress. Physical activity may play a role in resistance to the development of diabetic cardiomyopathy by improving myocardial mitochondrial biogenesis, the level of autophagy and dynamic changes in fusion and division; enhancing the ability to cope with oxidative stress; and optimising the metabolic substrates of the myocardium. This paper puts forward a new idea for further understanding the specific mitochondrial mechanism of the occurrence and development of diabetic cardiomyopathy and clarifying the role of exercise-mediated myocardial mitochondrial changes in the prevention and treatment of diabetic cardiomyopathy. This is expected to provide a new theoretical basis for exercise to reduce diabetic cardiomyopathy symptoms.
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Affiliation(s)
- Feng Zhang
- Sports Physiology DepartmentBeijing Sport UniversityBeijingChina
| | - Jian jian Lin
- PE Teaching and Research OfficeUniversity of International RelationshipBeijingChina
| | - Hao nan Tian
- Sports Physiology DepartmentBeijing Sport UniversityBeijingChina
| | - Jun Wang
- Sports Physiology DepartmentBeijing Sport UniversityBeijingChina
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4
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Hansen FM, Kremer LS, Karayel O, Bludau I, Larsson NG, Kühl I, Mann M. Mitochondrial phosphoproteomes are functionally specialized across tissues. Life Sci Alliance 2024; 7:e202302147. [PMID: 37984987 PMCID: PMC10662294 DOI: 10.26508/lsa.202302147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 11/03/2023] [Accepted: 11/07/2023] [Indexed: 11/22/2023] Open
Abstract
Mitochondria are essential organelles whose dysfunction causes human pathologies that often manifest in a tissue-specific manner. Accordingly, mitochondrial fitness depends on versatile proteomes specialized to meet diverse tissue-specific requirements. Increasing evidence suggests that phosphorylation may play an important role in regulating tissue-specific mitochondrial functions and pathophysiology. Building on recent advances in mass spectrometry (MS)-based proteomics, we here quantitatively profile mitochondrial tissue proteomes along with their matching phosphoproteomes. We isolated mitochondria from mouse heart, skeletal muscle, brown adipose tissue, kidney, liver, brain, and spleen by differential centrifugation followed by separation on Percoll gradients and performed high-resolution MS analysis of the proteomes and phosphoproteomes. This in-depth map substantially quantifies known and predicted mitochondrial proteins and provides a resource of core and tissue-specific mitochondrial proteins (mitophos.de). Predicting kinase substrate associations for different mitochondrial compartments indicates tissue-specific regulation at the phosphoproteome level. Illustrating the functional value of our resource, we reproduce mitochondrial phosphorylation events on dynamin-related protein 1 responsible for its mitochondrial recruitment and fission initiation and describe phosphorylation clusters on MIGA2 linked to mitochondrial fusion.
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Affiliation(s)
- Fynn M Hansen
- https://ror.org/04py35477 Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Laura S Kremer
- https://ror.org/056d84691 Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Ozge Karayel
- https://ror.org/04py35477 Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Isabell Bludau
- https://ror.org/04py35477 Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Nils-Göran Larsson
- https://ror.org/056d84691 Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Inge Kühl
- Department of Cell Biology, Institute of Integrative Biology of the Cell, UMR9198, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Matthias Mann
- https://ror.org/04py35477 Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany
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5
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Zhou Y, Suo W, Zhang X, Liang J, Zhao W, Wang Y, Li H, Ni Q. Targeting mitochondrial quality control for diabetic cardiomyopathy: Therapeutic potential of hypoglycemic drugs. Biomed Pharmacother 2023; 168:115669. [PMID: 37820568 DOI: 10.1016/j.biopha.2023.115669] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/23/2023] [Accepted: 10/06/2023] [Indexed: 10/13/2023] Open
Abstract
Diabetic cardiomyopathy is a chronic cardiovascular complication caused by diabetes that is characterized by changes in myocardial structure and function, ultimately leading to heart failure and even death. Mitochondria serve as the provider of energy to cardiomyocytes, and mitochondrial dysfunction plays a central role in the development of diabetic cardiomyopathy. In response to a series of pathological changes caused by mitochondrial dysfunction, the mitochondrial quality control system is activated. The mitochondrial quality control system (including mitochondrial biogenesis, fusion and fission, and mitophagy) is core to maintaining the normal structure of mitochondria and performing their normal physiological functions. However, mitochondrial quality control is abnormal in diabetic cardiomyopathy, resulting in insufficient mitochondrial fusion and excessive fission within the cardiomyocyte, and fragmented mitochondria are not phagocytosed in a timely manner, accumulating within the cardiomyocyte resulting in cardiomyocyte injury. Currently, there is no specific therapy or prevention for diabetic cardiomyopathy, and glycemic control remains the mainstay. In this review, we first elucidate the pathogenesis of diabetic cardiomyopathy and explore the link between pathological mitochondrial quality control and the development of diabetic cardiomyopathy. Then, we summarize how clinically used hypoglycemic agents (including sodium-glucose cotransport protein 2 inhibitions, glucagon-like peptide-1 receptor agonists, dipeptidyl peptidase-4 inhibitors, thiazolidinediones, metformin, and α-glucosidase inhibitors) exert cardioprotective effects to treat and prevent diabetic cardiomyopathy by targeting the mitochondrial quality control system. In addition, the mechanisms of complementary alternative therapies, such as active ingredients of traditional Chinese medicine, exercise, and lifestyle, targeting mitochondrial quality control for the treatment of diabetic cardiomyopathy are also added, which lays the foundation for the excavation of new diabetic cardioprotective drugs.
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Affiliation(s)
- Yutong Zhou
- Guang'an Men Hospital, China Academy of Chinese Medicine, Beijing 100053, China
| | - Wendong Suo
- LongHua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - Xinai Zhang
- Guang'an Men Hospital, China Academy of Chinese Medicine, Beijing 100053, China
| | - Jiaojiao Liang
- Zhengzhou Shuqing Medical College, Zhengzhou 450064, China
| | - Weizhe Zhao
- College of Traditional Chinese Medicine, Beijing University of Traditional Chinese Medicine, Beijing 100105, China
| | - Yue Wang
- Capital Medical University, Beijing 100069, China
| | - Hong Li
- LongHua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China.
| | - Qing Ni
- Guang'an Men Hospital, China Academy of Chinese Medicine, Beijing 100053, China.
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6
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Chang W, Li W, Li P. The anti-diabetic effects of metformin are mediated by regulating long non-coding RNA. Front Pharmacol 2023; 14:1256705. [PMID: 38053839 PMCID: PMC10694297 DOI: 10.3389/fphar.2023.1256705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 11/02/2023] [Indexed: 12/07/2023] Open
Abstract
Type 2 diabetes (T2D) is a metabolic disease with complex etiology and mechanisms. Long non-coding ribonucleic acid (LncRNA) is a novel class of functional long RNA molecules that regulate multiple biological functions through various mechanisms. Studies in the past decade have shown that lncRNAs may play an important role in regulating insulin resistance and the progression of T2D. As a widely used biguanide drug, metformin has been used for glucose lowering effects in clinical practice for more than 60 years. For diabetic therapy, metformin reduces glucose absorption from the intestines, lowers hepatic gluconeogenesis, reduces inflammation, and improves insulin sensitivity. However, despite being widely used as the first-line oral antidiabetic drug, its mechanism of action remains largely elusive. Currently, an increasing number of studies have demonstrated that the anti-diabetic effects of metformin were mediated by the regulation of lncRNAs. Metformin-regulated lncRNAs have been shown to participate in the inhibition of gluconeogenesis, regulation of lipid metabolism, and be anti-inflammatory. Thus, this review focuses on the mechanisms of action of metformin in regulating lncRNAs in diabetes, including pathways altered by metformin via targeting lncRNAs, and the potential targets of metformin through modulation of lncRNAs. Knowledge of the mechanisms of lncRNA modulation by metformin in diabetes will aid the development of new therapeutic drugs for T2D in the future.
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Affiliation(s)
- Wenguang Chang
- Institute for Translational Medicine, The Affiliated Hospital, College of Medicine, Qingdao University, Qingdao, China
| | - Wei Li
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, China
| | - Peifeng Li
- Institute for Translational Medicine, The Affiliated Hospital, College of Medicine, Qingdao University, Qingdao, China
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7
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Hernandez-Resendiz S, Prakash A, Loo SJ, Semenzato M, Chinda K, Crespo-Avilan GE, Dam LC, Lu S, Scorrano L, Hausenloy DJ. Targeting mitochondrial shape: at the heart of cardioprotection. Basic Res Cardiol 2023; 118:49. [PMID: 37955687 PMCID: PMC10643419 DOI: 10.1007/s00395-023-01019-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 11/14/2023]
Abstract
There remains an unmet need to identify novel therapeutic strategies capable of protecting the myocardium against the detrimental effects of acute ischemia-reperfusion injury (IRI), to reduce myocardial infarct (MI) size and prevent the onset of heart failure (HF) following acute myocardial infarction (AMI). In this regard, perturbations in mitochondrial morphology with an imbalance in mitochondrial fusion and fission can disrupt mitochondrial metabolism, calcium homeostasis, and reactive oxygen species production, factors which are all known to be critical determinants of cardiomyocyte death following acute myocardial IRI. As such, therapeutic approaches directed at preserving the morphology and functionality of mitochondria may provide an important strategy for cardioprotection. In this article, we provide an overview of the alterations in mitochondrial morphology which occur in response to acute myocardial IRI, and highlight the emerging therapeutic strategies for targeting mitochondrial shape to preserve mitochondrial function which have the future therapeutic potential to improve health outcomes in patients presenting with AMI.
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Affiliation(s)
- Sauri Hernandez-Resendiz
- Duke-NUS Medical School, Cardiovascular and Metabolic Disorders Programme, Singapore, Singapore
- National Heart Centre Singapore, National Heart Research Institute Singapore, Singapore, Singapore
| | - Aishwarya Prakash
- Duke-NUS Medical School, Cardiovascular and Metabolic Disorders Programme, Singapore, Singapore
- National Heart Centre Singapore, National Heart Research Institute Singapore, Singapore, Singapore
| | - Sze Jie Loo
- Duke-NUS Medical School, Cardiovascular and Metabolic Disorders Programme, Singapore, Singapore
- National Heart Centre Singapore, National Heart Research Institute Singapore, Singapore, Singapore
| | | | - Kroekkiat Chinda
- Department of Physiology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Gustavo E Crespo-Avilan
- Duke-NUS Medical School, Cardiovascular and Metabolic Disorders Programme, Singapore, Singapore
- National Heart Centre Singapore, National Heart Research Institute Singapore, Singapore, Singapore
| | - Linh Chi Dam
- Duke-NUS Medical School, Cardiovascular and Metabolic Disorders Programme, Singapore, Singapore
- National Heart Centre Singapore, National Heart Research Institute Singapore, Singapore, Singapore
| | - Shengjie Lu
- Duke-NUS Medical School, Cardiovascular and Metabolic Disorders Programme, Singapore, Singapore
- National Heart Centre Singapore, National Heart Research Institute Singapore, Singapore, Singapore
| | - Luca Scorrano
- Veneto Institute of Molecular Medicine, Padova, Italy
- Department of Biology, University of Padova, Padova, Italy
| | - Derek J Hausenloy
- Duke-NUS Medical School, Cardiovascular and Metabolic Disorders Programme, Singapore, Singapore.
- National Heart Centre Singapore, National Heart Research Institute Singapore, Singapore, Singapore.
- National University Singapore, Yong Loo Lin School of Medicine, Singapore, Singapore.
- University College London, The Hatter Cardiovascular Institute, London, UK.
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8
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Tokuyama T, Yanagi S. Role of Mitochondrial Dynamics in Heart Diseases. Genes (Basel) 2023; 14:1876. [PMID: 37895224 PMCID: PMC10606177 DOI: 10.3390/genes14101876] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 09/22/2023] [Indexed: 10/29/2023] Open
Abstract
Mitochondrial dynamics, including fission and fusion processes, are essential for heart health. Mitochondria, the powerhouses of cells, maintain their integrity through continuous cycles of biogenesis, fission, fusion, and degradation. Mitochondria are relatively immobile in the adult heart, but their morphological changes due to mitochondrial morphology factors are critical for cellular functions such as energy production, organelle integrity, and stress response. Mitochondrial fusion proteins, particularly Mfn1/2 and Opa1, play multiple roles beyond their pro-fusion effects, such as endoplasmic reticulum tethering, mitophagy, cristae remodeling, and apoptosis regulation. On the other hand, the fission process, regulated by proteins such as Drp1, Fis1, Mff and MiD49/51, is essential to eliminate damaged mitochondria via mitophagy and to ensure proper cell division. In the cardiac system, dysregulation of mitochondrial dynamics has been shown to cause cardiac hypertrophy, heart failure, ischemia/reperfusion injury, and various cardiac diseases, including metabolic and inherited cardiomyopathies. In addition, mitochondrial dysfunction associated with oxidative stress has been implicated in atherosclerosis, hypertension and pulmonary hypertension. Therefore, understanding and regulating mitochondrial dynamics is a promising therapeutic tool in cardiac diseases. This review summarizes the role of mitochondrial morphology in heart diseases for each mitochondrial morphology regulatory gene, and their potential as therapeutic targets to heart diseases.
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Affiliation(s)
- Takeshi Tokuyama
- Division of Regenerative Medicine, Center for Molecular Medicine, Jichi Medical University, Shimotsuke 329-0498, Tochigi, Japan
| | - Shigeru Yanagi
- Laboratory of Molecular Biochemistry, Department of Life Science, Faculty of Science, Gakushuin University, Mejiro, Tokyo 171-0031, Japan;
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9
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Potel KN, Cornelius VA, Yacoub A, Chokr A, Donaghy CL, Kelaini S, Eleftheriadou M, Margariti A. Effects of non-coding RNAs and RNA-binding proteins on mitochondrial dysfunction in diabetic cardiomyopathy. Front Cardiovasc Med 2023; 10:1165302. [PMID: 37719978 PMCID: PMC10502732 DOI: 10.3389/fcvm.2023.1165302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 08/15/2023] [Indexed: 09/19/2023] Open
Abstract
Vascular complications are the main cause of diabetes mellitus-associated morbidity and mortality. Oxidative stress and metabolic dysfunction underly injury to the vascular endothelium and myocardium, resulting in diabetic angiopathy and cardiomyopathy. Mitochondrial dysfunction has been shown to play an important role in cardiomyopathic disruptions of key cellular functions, including energy metabolism and oxidative balance. Both non-coding RNAs and RNA-binding proteins are implicated in diabetic cardiomyopathy, however, their impact on mitochondrial dysfunction in the context of this disease is largely unknown. Elucidating the effects of non-coding RNAs and RNA-binding proteins on mitochondrial pathways in diabetic cardiomyopathy would allow further insights into the pathophysiological mechanisms underlying diabetic vascular complications and could facilitate the development of new therapeutic strategies. Stem cell-based models can facilitate the study of non-coding RNAs and RNA-binding proteins and their unique characteristics make them a promising tool to improve our understanding of mitochondrial dysfunction and vascular complications in diabetes.
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Affiliation(s)
- Koray N. Potel
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, United Kingdom
| | - Victoria A. Cornelius
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, United Kingdom
| | - Andrew Yacoub
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, United Kingdom
| | - Ali Chokr
- Faculty of Medicine, University of Picardie Jules Verne, Amiens, France
| | - Clare L. Donaghy
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, United Kingdom
| | - Sophia Kelaini
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, United Kingdom
| | - Magdalini Eleftheriadou
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, United Kingdom
| | - Andriana Margariti
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, United Kingdom
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10
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Ishii M, Rohrer B. Anaphylatoxin C5a receptor signaling induces mitochondrial fusion and sensitizes retinal pigment epithelial cells to oxidative stress. Biochim Biophys Acta Gen Subj 2023; 1867:130374. [PMID: 37187450 PMCID: PMC10330548 DOI: 10.1016/j.bbagen.2023.130374] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 04/20/2023] [Accepted: 04/26/2023] [Indexed: 05/17/2023]
Abstract
Mitochondrial dynamics is a morphological balance between fragmented and elongated shapes, reflecting mitochondrial metabolic status, cellular damage, and mitochondrial dysfunction. The anaphylatoxin C5a derived from complement component 5 cleavage, enhances cellular responses involved in pathological stimulation, innate immune responses, and host defense. However, the specific response of C5a and its receptor, C5a receptor (C5aR), in mitochondria is unclear. Here, we tested whether the C5a/C5aR signaling axis affects mitochondrial morphology in human-derived retinal pigment epithelial cell monolayers (ARPE-19). C5aR activation with the C5a polypeptide induced mitochondrial elongation. In contrast, oxidatively stressed cells (H2O2) responded to C5a with an enhancement of mitochondrial fragmentation and an increase in the number of pyknotic nuclei. C5a/C5aR signaling increased the expression of mitochondrial fusion-related protein, mitofusin-1 (MFN1) and - 2 (MFN2), as well as enhanced optic atrophy-1 (Opa1) cleavage, which are required for mitochondrial fusion events, whereas the mitochondrial fission protein, dynamin-related protein-1 (Drp1), and mitogen-activated protein kinase (MAPK)-dependent extracellular signal-regulated protein kinase (Erk1/2) phosphorylation were not affected. Moreover, C5aR activation increased the frequency of endoplasmic reticulum (ER)-mitochondria contacts. Finally, oxidative stress induced in a single cell within an RPE monolayer (488 nm blue laser spot stimulation) induced a bystander effect of mitochondrial fragmentation in adjacent surrounding cells only in C5a-treated monolayers. These results suggest that C5a/C5aR signaling produced an intermediate state, characterized by increased mitochondrial fusion and ER-mitochondrial contacts, that sensitizes cells to oxidative stress, leading to mitochondrial fragmentation and cell death.
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Affiliation(s)
- Masaaki Ishii
- Department of Ophthalmology, Medical University of South Carolina, Charleston, SC 29425, USA.
| | - Bärbel Rohrer
- Department of Ophthalmology, Medical University of South Carolina, Charleston, SC 29425, USA; Ralph H. Johnson VA Medical Center, Charleston, SC 29401, USA; Department of Neurosciences, Medical University of South Carolina, Charleston, SC, 29425, USA.
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11
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The Role of Mitochondria in Metabolic Syndrome–Associated Cardiomyopathy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:9196232. [PMID: 35783195 PMCID: PMC9246605 DOI: 10.1155/2022/9196232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 06/12/2022] [Accepted: 06/13/2022] [Indexed: 12/03/2022]
Abstract
With the rapid development of society, the incidence of metabolic syndrome (MS) is increasing rapidly. Evidence indicated that patients diagnosed with MS usually suffered from cardiomyopathy, called metabolic syndrome–associated cardiomyopathy (MSC). The clinical characteristics of MSC included cardiac hypertrophy and diastolic dysfunction, followed by heart failure. Despite many studies on this topic, the detailed mechanisms are not clear yet. As the center of cellular metabolism, mitochondria are crucial for maintaining heart function, while mitochondria dysfunction plays a vital role through mechanisms such as mitochondrial energy deprivation, calcium disorder, and ROS (reactive oxygen species) imbalance during the development of MSC. Accordingly, in this review, we will summarize the characteristics of MSC and especially focus on the mechanisms related to mitochondria. In addition, we will update new therapeutic strategies in this field.
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12
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Uchikado Y, Ikeda Y, Ohishi M. Current Understanding of the Pivotal Role of Mitochondrial Dynamics in Cardiovascular Diseases and Senescence. Front Cardiovasc Med 2022; 9:905072. [PMID: 35665261 PMCID: PMC9157625 DOI: 10.3389/fcvm.2022.905072] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Accepted: 04/14/2022] [Indexed: 12/11/2022] Open
Abstract
The heart is dependent on ATP production in mitochondria, which is closely associated with cardiovascular disease because of the oxidative stress produced by mitochondria. Mitochondria are highly dynamic organelles that constantly change their morphology to elongated (fusion) or small and spherical (fission). These mitochondrial dynamics are regulated by various small GTPases, Drp1, Fis1, Mitofusin, and Opa1. Mitochondrial fission and fusion are essential to maintain a balance between mitochondrial biogenesis and mitochondrial turnover. Recent studies have demonstrated that mitochondrial dynamics play a crucial role in the development of cardiovascular diseases and senescence. Disruptions in mitochondrial dynamics affect mitochondrial dysfunction and cardiomyocyte survival leading to cardiac ischemia/reperfusion injury, cardiomyopathy, and heart failure. Mitochondrial dynamics and reactive oxygen species production have been associated with endothelial dysfunction, which in turn causes the development of atherosclerosis, hypertension, and even pulmonary hypertension, including pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension. Here, we review the association between cardiovascular diseases and mitochondrial dynamics, which may represent a potential therapeutic target.
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Affiliation(s)
| | - Yoshiyuki Ikeda
- Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Sciences Kagoshima University, Kagoshima, Japan
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13
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Yang Y, Lei W, Zhao L, Wen Y, Li Z. Insights Into Mitochondrial Dynamics in Chlamydial Infection. Front Cell Infect Microbiol 2022; 12:835181. [PMID: 35321312 PMCID: PMC8936178 DOI: 10.3389/fcimb.2022.835181] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 02/16/2022] [Indexed: 12/15/2022] Open
Abstract
Mitochondria are intracellular organelles that are instrumental in the creation of energy, metabolism, apoptosis, and intrinsic immunity. Mitochondria exhibit an extraordinarily high degree of flexibility, and are constantly undergoing dynamic fusion and fission changes. Chlamydia is an intracellular bacterium that causes serious health problems in both humans and animals. Due to a deficiency of multiple metabolic enzymes, these pathogenic bacteria are highly dependent on their eukaryotic host cells, resulting in a close link between Chlamydia infection and host cell mitochondria. Indeed, Chlamydia increase mitochondrial fusion by inhibiting the activation of dynein-related protein 1 (DRP1), which can regulate host cell metabolism for extra energy. Additionally, Chlamydia can inhibit mitochondrial fission by blocking DRP1 oligomerization, preventing host cell apoptosis. These mechanisms are critical for maintaining a favorable environment for reproduction and growth of Chlamydia. This review discusses the molecular mechanisms of mitochondrial fusion and fission, as well as the mechanisms by which Chlamydia infection alters the mitochondrial dynamics and the prospects of limiting chlamydial development by altering mitochondrial dynamics.
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14
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Increased ROS-Dependent Fission of Mitochondria Causes Abnormal Morphology of the Cell Powerhouses in a Murine Model of Amyotrophic Lateral Sclerosis. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:6924251. [PMID: 34691359 PMCID: PMC8531774 DOI: 10.1155/2021/6924251] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 07/30/2021] [Accepted: 09/02/2021] [Indexed: 11/17/2022]
Abstract
Amyotrophic lateral sclerosis (ALS) is the most common motor neuron disease in humans and remains to have a fatal prognosis. Recent studies in animal models and human ALS patients indicate that increased reactive oxygen species (ROS) play an important role in the pathogenesis. Considering previous studies revealing the influence of ROS on mitochondrial physiology, our attention was focused on mitochondria in the murine ALS model, wobbler mouse. The aim of this study was to investigate morphological differences between wild-type and wobbler mitochondria with aid of superresolution structured illumination fluorescence microscopy, TEM, and TEM tomography. To get an insight into mitochondrial dynamics, expression studies of corresponding proteins were performed. Here, we found significantly smaller and degenerated mitochondria in wobbler motor neurons at a stable stage of the disease. Our data suggest a ROS-regulated, Ox-CaMKII-dependent Drp1 activation leading to disrupted fission-fusion balance, resulting in fragmented mitochondria. These changes are associated with numerous impairments, resulting in an overall self-reinforcing decline of motor neurons. In summary, our study provides common pathomechanisms with other ALS models and human ALS cases confirming mitochondria and related dysfunctions as a therapeutic target for the treatment of ALS.
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15
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Alkaline Reduced Water Attenuates Oxidative Stress-Induced Mitochondrial Dysfunction and Innate Immune Response Triggered by Intestinal Epithelial Dysfunction. Processes (Basel) 2021. [DOI: 10.3390/pr9101828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Redox imbalance in intestinal epithelial cells is critical in the early phases of intestinal injury. Dysfunction of the intestinal barrier can result in immunological imbalance and inflammation, thus leading to intestinal syndromes and associated illnesses. Several antioxidants have been discovered to be beneficial in resolving intestinal barrier dysfunction. Of these antioxidants, the effects of alkaline reduced water (ARW) in oxidative stress of intestinal epithelial cells and its immunokine modulation in vitro is unknown. In this study, we utilized ARW-enriched media to investigate its cytoprotective effect against H2O2-induced oxidative stress in DLD1 cells. We found that ARW rescued DLD1 from oxidative stress by diluting the influence of H2O2 on oxidative stress-activated MAPK signaling and mitochondrial dysfunction. Further, intestinal oxidative stress significantly affects immunokine profiles of Raw 264.7 cells (IL-6, IL-10, MCP, TNF-a, RANTES), which can be reversed by ARW. Collectively, ARW shields intestinal epithelial cells from oxidative stress, reducing the immunological mayhem caused by barrier failure.
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16
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Liu J, Song X, Yan Y, Liu B. Role of GTPase-Dependent Mitochondrial Dynamins in Heart Diseases. Front Cardiovasc Med 2021; 8:720085. [PMID: 34660720 PMCID: PMC8514750 DOI: 10.3389/fcvm.2021.720085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 09/06/2021] [Indexed: 12/25/2022] Open
Abstract
Heart function maintenance requires a large amount of energy, which is supplied by the mitochondria. In addition to providing energy to cardiomyocytes, mitochondria also play an important role in maintaining cell function and homeostasis. Although adult cardiomyocyte mitochondria appear as independent, low-static organelles, morphological changes have been observed in cardiomyocyte mitochondria under stress or pathological conditions. Indeed, cardiac mitochondrial fission and fusion are involved in the occurrence and development of heart diseases. As mitochondrial fission and fusion are primarily regulated by mitochondrial dynamins in a GTPase-dependent manner, GTPase-dependent mitochondrial fusion (MFN1, MFN2, and OPA1) and fission (DRP1) proteins, which are abundant in the adult heart, can also be regulated in heart diseases. In fact, these dynamic proteins have been shown to play important roles in specific diseases, including ischemia-reperfusion injury, heart failure, and metabolic cardiomyopathy. This article reviews the role of GTPase-dependent mitochondrial fusion and fission protein-mediated mitochondrial dynamics in the occurrence and development of heart diseases.
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Affiliation(s)
| | | | | | - Bin Liu
- Department of Cardiology, The Second Hospital of Jilin University, Changchun, China
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17
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Zhu Y, Kuang L, Wu Y, Deng H, She H, Zhou Y, Zhang J, Liu L, Li T. Protective Effects of Inhibition of Mitochondrial Fission on Organ Function After Sepsis. Front Pharmacol 2021; 12:712489. [PMID: 34566637 PMCID: PMC8457550 DOI: 10.3389/fphar.2021.712489] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 08/26/2021] [Indexed: 01/10/2023] Open
Abstract
Sepsis-associated organ dysfunction plays a critical role in its high mortality, mainly in connection with mitochondrial dysfunction. Whether the inhibition of mitochondrial fission is beneficial to sepsis-related organ dysfunction and underlying mechanisms are unknown. Cecal ligation and puncture induced sepsis in rats and dynamic related protein 1 knockout mice, lipopolysaccharide-treated vascular smooth muscle cells and cardiomyocytes, were used to explore the effects of inhibition of mitochondrial fission and specific mechanisms. Our study showed that mitochondrial fission inhibitor Mdivi-1 could antagonize sepsis-induced organ dysfunction including heart, vascular smooth muscle, liver, kidney, and intestinal functions, and prolonged animal survival. The further study showed that mitochondrial functions such as mitochondrial membrane potential, adenosine-triphosphate contents, reactive oxygen species, superoxide dismutase and malonaldehyde were recovered after Mdivi-1 administration via improving mitochondrial morphology. And sepsis-induced inflammation and apoptosis in heart and vascular smooth muscle were alleviated through inhibition of mitochondrial fission and mitochondrial function improvement. The parameter trends in lipopolysaccharide-stimulated cardiomyocytes and vascular smooth muscle cells were similar in vivo. Dynamic related protein 1 knockout preserved sepsis-induced organ dysfunction, and the animal survival was prolonged. Taken together, this finding provides a novel effective candidate therapy for severe sepsis/septic shock and other critical clinical diseases.
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Affiliation(s)
- Yu Zhu
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Lei Kuang
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Yue Wu
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Haoyue Deng
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Han She
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Yuanqun Zhou
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Jie Zhang
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Liangming Liu
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Tao Li
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
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18
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Nan J, Li J, Lin Y, Saif Ur Rahman M, Li Z, Zhu L. The interplay between mitochondria and store-operated Ca 2+ entry: Emerging insights into cardiac diseases. J Cell Mol Med 2021; 25:9496-9512. [PMID: 34564947 PMCID: PMC8505841 DOI: 10.1111/jcmm.16941] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 08/20/2021] [Accepted: 09/08/2021] [Indexed: 12/14/2022] Open
Abstract
Store‐operated Ca2+ entry (SOCE) machinery, including Orai channels, TRPCs, and STIM1, is key to cellular calcium homeostasis. The following characteristics of mitochondria are involved in the physiological and pathological regulation of cells: mitochondria mediate calcium uptake through calcium uniporters; mitochondria are regulated by mitochondrial dynamic related proteins (OPA1, MFN1/2, and DRP1) and form mitochondrial networks through continuous fission and fusion; mitochondria supply NADH to the electron transport chain through the Krebs cycle to produce ATP; under stress, mitochondria will produce excessive reactive oxygen species to regulate mitochondria‐endoplasmic reticulum interactions and the related signalling pathways. Both SOCE and mitochondria play critical roles in mediating cardiac hypertrophy, diabetic cardiomyopathy, and cardiac ischaemia‐reperfusion injury. All the mitochondrial characteristics mentioned above are determinants of SOCE activity, and vice versa. Ca2+ signalling dictates the reciprocal regulation between mitochondria and SOCE under the specific pathological conditions of cardiomyocytes. The coupling of mitochondria and SOCE is essential for various pathophysiological processes in the heart. Herein, we review the research focussing on the reciprocal regulation between mitochondria and SOCE and provide potential interplay patterns in cardiac diseases.
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Affiliation(s)
- Jinliang Nan
- Provincial Key Cardiovascular Research Laboratory, Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Zhejiang Province, Hangzhou, China
| | - Jiamin Li
- Provincial Key Cardiovascular Research Laboratory, Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Zhejiang Province, Hangzhou, China
| | - Yinuo Lin
- Wenzhou Municipal Key Cardiovascular Research Laboratory, Department of Cardiology, The First Affiliated Hospital, Wenzhou Medical University, Zhejiang Province, Wenzhou, China
| | - Muhammad Saif Ur Rahman
- Zhejiang University-University of Edinburgh Biomedical Institute, Haining, Zhejiang, China.,Clinical Research Center, The Second Affiliated Hospital Zhejiang University School of Medicine, Hangzhou, China
| | - Zhengzheng Li
- Department of Neurology, Research Institute of Experimental Neurobiology, The First Affiliated Hospital, Wenzhou Medical University, Zhejiang Province, Wenzhou, China
| | - Lingjun Zhu
- Provincial Key Cardiovascular Research Laboratory, Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Zhejiang Province, Hangzhou, China
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Aung LHH, Jumbo JCC, Wang Y, Li P. Therapeutic potential and recent advances on targeting mitochondrial dynamics in cardiac hypertrophy: A concise review. MOLECULAR THERAPY. NUCLEIC ACIDS 2021; 25:416-443. [PMID: 34484866 PMCID: PMC8405900 DOI: 10.1016/j.omtn.2021.06.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Pathological cardiac hypertrophy begins as an adaptive response to increased workload; however, sustained hemodynamic stress will lead it to maladaptation and eventually cardiac failure. Mitochondria, being the powerhouse of the cells, can regulate cardiac hypertrophy in both adaptive and maladaptive phases; they are dynamic organelles that can adjust their number, size, and shape through a process called mitochondrial dynamics. Recently, several studies indicate that promoting mitochondrial fusion along with preventing mitochondrial fission could improve cardiac function during cardiac hypertrophy and avert its progression toward heart failure. However, some studies also indicate that either hyperfusion or hypo-fission could induce apoptosis and cardiac dysfunction. In this review, we summarize the recent knowledge regarding the effects of mitochondrial dynamics on the development and progression of cardiac hypertrophy with particular emphasis on the regulatory role of mitochondrial dynamics proteins through the genetic, epigenetic, and post-translational mechanisms, followed by discussing the novel therapeutic strategies targeting mitochondrial dynamic pathways.
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Affiliation(s)
- Lynn Htet Htet Aung
- Center for Molecular Genetics, Institute for Translational Medicine, The Affiliated Hospital of Qingdao University, College of Medicine, Qingdao University, Qingdao 266021, China.,Center for Bioinformatics, Institute for Translational Medicine, School of Basic Science, College of Medicine, Qingdao University, Qingdao 266021, China
| | - Juan Carlos Cueva Jumbo
- School of Preclinical Medicine, Nanobody Research Center, Guangxi Medical University, Nanning 530021, China
| | - Yin Wang
- Center for Molecular Genetics, Institute for Translational Medicine, The Affiliated Hospital of Qingdao University, College of Medicine, Qingdao University, Qingdao 266021, China
| | - Peifeng Li
- Center for Molecular Genetics, Institute for Translational Medicine, The Affiliated Hospital of Qingdao University, College of Medicine, Qingdao University, Qingdao 266021, China.,Center for Bioinformatics, Institute for Translational Medicine, School of Basic Science, College of Medicine, Qingdao University, Qingdao 266021, China
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20
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Li D, Yang S, Xing Y, Pan L, Zhao R, Zhao Y, Liu L, Wu M. Novel Insights and Current Evidence for Mechanisms of Atherosclerosis: Mitochondrial Dynamics as a Potential Therapeutic Target. Front Cell Dev Biol 2021; 9:673839. [PMID: 34307357 PMCID: PMC8293691 DOI: 10.3389/fcell.2021.673839] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 06/16/2021] [Indexed: 12/12/2022] Open
Abstract
Cardiovascular disease (CVD) is the main cause of death worldwide. Atherosclerosis is the underlying pathological basis of CVD. Mitochondrial homeostasis is maintained through the dynamic processes of fusion and fission. Mitochondria are involved in many cellular processes, such as steroid biosynthesis, calcium homeostasis, immune cell activation, redox signaling, apoptosis, and inflammation, among others. Under stress conditions, mitochondrial dynamics, mitochondrial cristae remodeling, and mitochondrial ROS (mitoROS) production increase, mitochondrial membrane potential (MMP) decreases, calcium homeostasis is imbalanced, and mitochondrial permeability transition pore open (mPTP) and release of mitochondrial DNA (mtDNA) are activated. mtDNA recognized by TLR9 can lead to NF-κB pathway activation and pro-inflammatory factor expression. At the same time, TLR9 can also activate NLRP3 inflammasomes and release interleukin, an event that eventually leads to tissue damage and inflammatory responses. In addition, mitochondrial dysfunction may amplify the activation of NLRP3 through the production of mitochondrial ROS, which together aggravate accumulating mitochondrial damage. In addition, mtDNA defects or gene mutation can lead to mitochondrial oxidative stress. Finally, obesity, diabetes, hypertension and aging are risk factors for the progression of CVD, which are closely related to mitochondrial dynamics. Mitochondrial dynamics may represent a new target in the treatment of atherosclerosis. Antioxidants, mitochondrial inhibitors, and various new therapies to correct mitochondrial dysfunction represent a few directions for future research on therapeutic intervention and amelioration of atherosclerosis.
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Affiliation(s)
- Dan Li
- Guang'an Men Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Shengjie Yang
- Guang'an Men Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yanwei Xing
- Guang'an Men Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Limin Pan
- Guang'an Men Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Ran Zhao
- Guang'an Men Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yixi Zhao
- Guang'an Men Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Longtao Liu
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Min Wu
- Guang'an Men Hospital, China Academy of Chinese Medical Sciences, Beijing, China
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21
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Cardiac Mitochondrial PTEN-L determines cell fate between apoptosis and survival during chronic alcohol consumption. Apoptosis 2021; 25:590-604. [PMID: 32591959 DOI: 10.1007/s10495-020-01616-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Chronic alcohol consumption induces myocardial damage and a type of non-ischemic cardiomyopathy termed alcoholic cardiomyopathy, where mitochondrial ultrastructural damages and suppressed fusion activity promote cardiomyocyte apoptosis. The aim of the present study is to determine the role of mitochondrial fission proteins and/or other proteins that localise on cardiac mitochondria for apoptosis upon ethanol consumption. In vivo and in vitro chronic alcohol exposure increased mitochondrial Drp1 levels but knockdown of the same did not confer cardioprotection in H9c2 cells. These cells displayed downregulated expression of MFN2 and OPA1 for Bak-mediated cytochrome c release and apoptosis. Dysregulated PTEN/AKT cell survival signal in both ethanol treated and Drp1 knockdown cells augmented oxidative stress by promoting mitochondrial PTEN-L and MFN1 interaction. Inhibiting this interaction with VO-OHpic, a reversible PTEN inhibitor, prevented Bak insertion into the mitochondria and release of cytochrome c to cytoplasm. Thus, our study provides evidence that Drp1-mediated mitochondrial fission is dispensable for ethanol-induced cardiotoxicity and that stress signals induce mitochondrial PTEN-L accumulation for structural and functional dyshomeostasis. Our in vivo results also demonstrates the therapeutic potential of VO-OHpic for habitual alcoholics developing myocardial dysfunction.
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22
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Ushio-Fukai M, Ash D, Nagarkoti S, Belin de Chantemèle EJ, Fulton DJR, Fukai T. Interplay Between Reactive Oxygen/Reactive Nitrogen Species and Metabolism in Vascular Biology and Disease. Antioxid Redox Signal 2021; 34:1319-1354. [PMID: 33899493 PMCID: PMC8418449 DOI: 10.1089/ars.2020.8161] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Reactive oxygen species (ROS; e.g., superoxide [O2•-] and hydrogen peroxide [H2O2]) and reactive nitrogen species (RNS; e.g., nitric oxide [NO•]) at the physiological level function as signaling molecules that mediate many biological responses, including cell proliferation, migration, differentiation, and gene expression. By contrast, excess ROS/RNS, a consequence of dysregulated redox homeostasis, is a hallmark of cardiovascular disease. Accumulating evidence suggests that both ROS and RNS regulate various metabolic pathways and enzymes. Recent studies indicate that cells have mechanisms that fine-tune ROS/RNS levels by tight regulation of metabolic pathways, such as glycolysis and oxidative phosphorylation. The ROS/RNS-mediated inhibition of glycolytic pathways promotes metabolic reprogramming away from glycolytic flux toward the oxidative pentose phosphate pathway to generate nicotinamide adenine dinucleotide phosphate (NADPH) for antioxidant defense. This review summarizes our current knowledge of the mechanisms by which ROS/RNS regulate metabolic enzymes and cellular metabolism and how cellular metabolism influences redox homeostasis and the pathogenesis of disease. A full understanding of these mechanisms will be important for the development of new therapeutic strategies to treat diseases associated with dysregulated redox homeostasis and metabolism. Antioxid. Redox Signal. 34, 1319-1354.
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Affiliation(s)
- Masuko Ushio-Fukai
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Medicine (Cardiology) and Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Dipankar Ash
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Medicine (Cardiology) and Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Sheela Nagarkoti
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Medicine (Cardiology) and Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Eric J Belin de Chantemèle
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Medicine (Cardiology) and Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - David J R Fulton
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Tohru Fukai
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Charlie Norwood Veterans Affairs Medical Center, Augusta, Georgia, USA
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23
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Li W, Ji L, Tian J, Tang W, Shan X, Zhao P, Chen H, Zhang C, Xu M, Lu R, Guo W. Ophiopogonin D alleviates diabetic myocardial injuries by regulating mitochondrial dynamics. JOURNAL OF ETHNOPHARMACOLOGY 2021; 271:113853. [PMID: 33485986 DOI: 10.1016/j.jep.2021.113853] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 01/12/2021] [Accepted: 01/15/2021] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Ophiopogonin D (OP-D) is a steroidal saponin extracted from Ophiopogon japonicus (Thunb.) Ker Gawl. (Liliaceae), that has been traditionally used to treat cough, sputum, and thirst in some Asian countries. Recently, various pharmacological roles of OP-D have been identified, including anti-inflammatory, cardioprotective, and anti-cancer effects. However, whether OP-D can prevent diabetic myocardial injury remains unknown. AIM OF THE STUDY In this study, we aimed to observe the effects of OP-D on the diabetic myocardium. MATERIALS AND METHODS Leptin receptor-deficient db/db mice were used as an animal model for type 2 diabetes. The effects of OP-D on blood glucose, blood lipids, myocardial ultrastructure, and mitochondrial function in mice were observed after four weeks of intragastric administration. Palmitic acid was used to stimulate cardiomyocytes to establish a myocardial lipotoxicity model. Cell apoptosis, mitochondrial morphology, and function were observed. RESULTS Blood glucose and blood lipid levels were significantly increased in db/db mice, accompanied by myocardial mitochondrial injury and dysfunction. OP-D treatment reduced blood lipid levels in db/db mice and relieved mitochondrial injury and dysfunction. OP-D inhibited palmitic acid induced-mitochondrial fission and dysfunction, reduced endogenous apoptosis, and improved cell survival rate in H9C2 cardiomyocytes. Both in vivo and in vitro models showed increased phosphorylation of DRP1 at Ser-616, reduced phosphorylation of DRP1 at Ser-637, and reduced expression of fusion proteins MFN1/2 and OPA1. Meanwhile, immunofluorescence co-localization analysis revealed that palmitic acid stimulated the translocation of DRP1 protein from the cytoplasm to the mitochondria in H9C2 cardiomyocytes. The imbalance of mitochondrial dynamics, protein expression, and translocation of DRP1 were effectively reversed by OP-D treatment. In isolated mice ventricular myocytes, palmitic acid enhanced cytoplasmic Ca2+ levels and suppressed contractility in ventricular myocytes, accompanied by activation of calcineurin, a key regulator of DRP1 dephosphorylation at Ser-637. OP-D reversed the changes caused by palmitic acid. CONCLUSIONS Our findings indicate that OP-D intervention could alleviate lipid accumulation and mitochondrial injury in diabetic mouse hearts and palmitic acid-stimulated cardiomyocytes. The cardioprotective effect of OP-D may be mediated by the regulation of mitochondrial dynamics.
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Affiliation(s)
- Weiwei Li
- School of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Louyin Ji
- School of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Jing Tian
- School of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Wenzhu Tang
- School of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Xiaoli Shan
- Public Laboratory Platform, School of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Pei Zhao
- Public Laboratory Platform, School of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Huihua Chen
- School of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Chen Zhang
- Department of Pathology, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Ming Xu
- Department of Physiology, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Rong Lu
- School of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Wei Guo
- Department of Pathology, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
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24
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Yu J, He J, Yang W, Wang X, Shi G, Duan Y, Wang H, Han C. Diabetes impairs the protective effects of sevoflurane postconditioning in the myocardium subjected to ischemia/ reperfusion injury in rats: important role of Drp1. BMC Cardiovasc Disord 2021; 21:96. [PMID: 33593294 PMCID: PMC7885510 DOI: 10.1186/s12872-021-01906-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 02/04/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Sevoflurane postconditioning (SevP) effectively relieves myocardial ischemia/reperfusion (I/R) injury but performs poorly in the diabetic myocardium. Previous studies have revealed the important role of increased oxidative stress in diabetic tissues. Notably, mitochondrial fission mediated by dynamin-related protein 1 (Drp1) is an upstream pathway of reactive oxygen production. Whether the ineffectiveness of SevP in the diabetic myocardium is related to Drp1-dependent mitochondrial fission remains unknown. This study aimed to explore the important role of Drp1 in the diabetic myocardium and investigate whether Drp1 inhibition could restore the cardioprotective effect of SevP. METHODS In the first part of the study, adult male Sprague-Dawley rats were divided into 6 groups. Rats in the diabetic groups were fed with high-fat and high-sugar diets for 8 weeks and injected intraperitoneally with streptozotocin (35 mg/kg). Myocardial I/R was induced by 30 min of occlusion of the left anterior descending branch of the coronary artery followed by 120 min of reperfusion. SevP was applied by continuous inhalation of 2.5 % sevoflurane 1 min before reperfusion, which lasted for 10 min. In the second part of the study, we applied mdivi-1 to investigate whether Drp1 inhibition could restore the cardioprotective effect of SevP in the diabetic myocardium. The myocardial infarct size, mitochondrial ultrastructure, apoptosis index, SOD activity, MDA content, and Drp1 expression were detected. RESULTS TTC staining and TUNEL results showed that the myocardial infarct size and apoptosis index were increased in the diabetic myocardium. However, SevP significantly alleviated myocardial I/R injury in the normal myocardium but not in the diabetic myocardium. Additionally, we found an elevation in Drp1 expression, accompanied by more severe fission-induced structural damage and oxidative stress in the diabetic myocardium. Interestingly, we discovered that the beneficial effect of SevP was restored by mdivi-1, which significantly suppressed mitochondrial fission and oxidative stress. CONCLUSIONS Our study demonstrates the crucial role of mitochondrial fission dependent on Drp1 in the diabetic myocardium subjected to I/R, and strongly indicates that Drp1 inhibition may restore the cardioprotective effect of SevP in diabetic rats.
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MESH Headings
- Anesthetics, Inhalation/pharmacology
- Animals
- Apoptosis/drug effects
- Diabetes Mellitus, Experimental/complications
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Experimental/pathology
- Dynamins/metabolism
- Male
- Mitochondria, Heart/drug effects
- Mitochondria, Heart/metabolism
- Mitochondria, Heart/pathology
- Mitochondrial Dynamics/drug effects
- Myocardial Infarction/complications
- Myocardial Infarction/metabolism
- Myocardial Infarction/pathology
- Myocardial Infarction/prevention & control
- Myocardial Reperfusion Injury/complications
- Myocardial Reperfusion Injury/metabolism
- Myocardial Reperfusion Injury/pathology
- Myocardial Reperfusion Injury/prevention & control
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/metabolism
- Myocytes, Cardiac/pathology
- Oxidative Stress/drug effects
- Rats, Sprague-Dawley
- Sevoflurane/pharmacology
- Rats
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Affiliation(s)
- Jing Yu
- Department of Anesthesiology, Shanxi Bethune Hospital, 99, Longcheng Street, 030032, Taiyuan, China
| | - Jiandong He
- Department of Anesthesiology, Shanxi Bethune Hospital, 99, Longcheng Street, 030032, Taiyuan, China
| | - Wenqu Yang
- Department of Anesthesiology, Shanxi Bethune Hospital, 99, Longcheng Street, 030032, Taiyuan, China
| | - Xiang Wang
- Department of Anesthesiology, Shanxi Bethune Hospital, 99, Longcheng Street, 030032, Taiyuan, China
| | - Gaoxiang Shi
- Department of Anesthesiology, Shanxi Bethune Hospital, 99, Longcheng Street, 030032, Taiyuan, China
| | - Yinglei Duan
- Department of Anesthesiology, Shanxi Bethune Hospital, 99, Longcheng Street, 030032, Taiyuan, China
| | - Hui Wang
- Department of Anesthesiology, Shanxi Bethune Hospital, 99, Longcheng Street, 030032, Taiyuan, China
| | - Chongfang Han
- Department of Anesthesiology, Shanxi Bethune Hospital, 99, Longcheng Street, 030032, Taiyuan, China.
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25
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Bai J, Liu C, Zhu P, Li Y. Novel Insights Into Molecular Mechanism of Mitochondria in Diabetic Cardiomyopathy. Front Physiol 2021; 11:609157. [PMID: 33536936 PMCID: PMC7849834 DOI: 10.3389/fphys.2020.609157] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 12/21/2020] [Indexed: 12/11/2022] Open
Abstract
Cardiovascular complication is one of the significant causes of death in diabetic mellitus (DM) in which diabetic cardiomyopathy, independent of hypertension, cardiac valvular disease, and coronary atherosclerosis, occupies an important position. Although the detailed pathogenesis of diabetic cardiomyopathy remains unclear currently, mitochondrial morphological abnormality and dysfunction were observed in diabetic cardiomyopathy animal models according to much research, suggesting that mitochondrial structural and functional impairment played an integral role in the formation of diabetic cardiomyopathy. Thus, we have summarized the effect of mitochondria on the process of diabetic cardiomyopathy, including abnormal mitochondrial morphology, mitochondrial energy metabolism disorder, enhanced mitochondrial oxidative stress, mitochondrial unbalanced calcium homeostasis, and mitochondrial autophagy. Based on the above mechanisms and the related evidence, more therapeutic strategies targeting mitochondria in diabetic cardiomyopathy have been and will be proposed to delay the progression of the disease.
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Affiliation(s)
- Jing Bai
- Medical School of Chinese PLA, Beijing, China.,Department of Cardiology, The Sixth Medical Center, Chinese PLA General Hospital, Beijing, China
| | - Chuanbin Liu
- Medical School of Chinese PLA, Beijing, China.,Department of Cardiology, The Sixth Medical Center, Chinese PLA General Hospital, Beijing, China
| | - Pingjun Zhu
- Department of Cardiology, The Sixth Medical Center, Chinese PLA General Hospital, Beijing, China
| | - Yang Li
- Medical School of Chinese PLA, Beijing, China.,Department of Cardiology, The Sixth Medical Center, Chinese PLA General Hospital, Beijing, China
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26
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The Impact of Mitochondrial Fission-Stimulated ROS Production on Pro-Apoptotic Chemotherapy. BIOLOGY 2021; 10:biology10010033. [PMID: 33418995 PMCID: PMC7825353 DOI: 10.3390/biology10010033] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 12/29/2020] [Accepted: 01/01/2021] [Indexed: 02/06/2023]
Abstract
Cancer is one of the world's deadliest afflictions. Despite recent advances in diagnostic and surgical technologies, as well as improved treatments of some individual tumor types, there is currently no universal cure to prevent or impede the uncontrolled proliferation of malignant cells. Targeting tumors by inducing apoptosis is one of the pillars of cancer treatment. Changes in mitochondrial morphology precede intrinsic apoptosis, but mitochondrial dynamics has only recently been recognized as a viable pharmacological target. In many cancers, oncogenic transformation is accompanied by accumulation of elevated cellular levels of ROS leading to redox imbalance. Hence, a common chemotherapeutic strategy against such tumor types involves deploying pro-oxidant agents to increase ROS levels above an apoptotic death-inducing threshold. The aim of this chapter is to investigate the benefit of stimulating mitochondrial fission-dependent production of ROS for enhanced killing of solid tumors. The main question to be addressed is whether a sudden and abrupt change in mitochondrial shape toward the fragmented phenotype can be pharmacologically harnessed to trigger a burst of mitochondrial ROS sufficient to initiate apoptosis specifically in cancer cells but not in non-transformed healthy tissues.
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27
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Forte M, Schirone L, Ameri P, Basso C, Catalucci D, Modica J, Chimenti C, Crotti L, Frati G, Rubattu S, Schiattarella GG, Torella D, Perrino C, Indolfi C, Sciarretta S. The role of mitochondrial dynamics in cardiovascular diseases. Br J Pharmacol 2020; 178:2060-2076. [DOI: 10.1111/bph.15068] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 03/31/2020] [Accepted: 04/01/2020] [Indexed: 12/22/2022] Open
Affiliation(s)
- Maurizio Forte
- Department of AngioCardioNeurology IRCCS Neuromed Pozzili Italy
| | - Leonardo Schirone
- Department of Medical and Surgical Sciences and Biotechnologies Sapienza University of Rome Latina Italy
- Department of Internal, Anesthetic and Cardiovascular Clinical Sciences “La Sapienza” University of Rome Rome Italy
| | - Pietro Ameri
- Cardiovascular Disease Unit IRCCS Ospedale Policlinico Genova Italy
- Department of Internal Medicine University of Genova Genova Italy
| | - Cristina Basso
- Cardiovascular Pathology Unit, Department of Cardiac, Thoracic, Vascular Sciences and Public Health University of Padua Medical School Padova Italy
| | - Daniele Catalucci
- Humanitas Clinical and Research Center IRCCS Rozzano Italy
- National Research Council Institute of Genetic and Biomedical Research ‐ UOS Milan Italy
| | - Jessica Modica
- Humanitas Clinical and Research Center IRCCS Rozzano Italy
- National Research Council Institute of Genetic and Biomedical Research ‐ UOS Milan Italy
| | - Cristina Chimenti
- Department of Cardiovascular, Respiratory, Nephrologic, and Geriatric Sciences Sapienza University of Rome Rome Italy
| | - Lia Crotti
- Istituto Auxologico Italiano IRCCS, Center for Cardiac Arrhythmias of Genetic Origin and Laboratory of Cardiovascular Genetics Milan Italy
- Istituto Auxologico Italiano, IRCCS, Department of Cardiovascular, Neural and Metabolic Sciences San Luca Hospital Milan Italy
- Department of Medicine and Surgery Università Milano‐Bicocca Milan Italy
| | - Giacomo Frati
- Department of AngioCardioNeurology IRCCS Neuromed Pozzili Italy
- Department of Medical and Surgical Sciences and Biotechnologies Sapienza University of Rome Latina Italy
| | - Speranza Rubattu
- Department of AngioCardioNeurology IRCCS Neuromed Pozzili Italy
- Department of Clinical and Molecular Medicine, School of Medicine and Psychology Sapienza University of Rome Rome Italy
| | - Gabriele Giacomo Schiattarella
- Department of Internal Medicine (Cardiology) University of Texas Southwestern Medical Center Dallas TX USA
- Division of Cardiology, Department of Advanced Biomedical Sciences Federico II University of Naples Naples Italy
| | - Daniele Torella
- Molecular and Cellular Cardiology Laboratory, Department of Experimental and Clinical Medicine Magna Graecia University Catanzaro Italy
| | - Cinzia Perrino
- Division of Cardiology, Department of Advanced Biomedical Sciences Federico II University of Naples Naples Italy
| | - Ciro Indolfi
- Molecular and Cellular Cardiology Laboratory, Department of Experimental and Clinical Medicine Magna Graecia University Catanzaro Italy
| | - Sebastiano Sciarretta
- Department of AngioCardioNeurology IRCCS Neuromed Pozzili Italy
- Department of Medical and Surgical Sciences and Biotechnologies Sapienza University of Rome Latina Italy
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28
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Kelm NQ, Beare JE, Weber GJ, LeBlanc AJ. Thrombospondin-1 mediates Drp-1 signaling following ischemia reperfusion in the aging heart. FASEB Bioadv 2020; 2:304-314. [PMID: 32395703 PMCID: PMC7211039 DOI: 10.1096/fba.2019-00090] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 11/07/2019] [Accepted: 02/19/2020] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Ischemia reperfusion (IR) injury leads to activation of dynamin-related protein (Drp-1), causing mitochondrial fission and generation of reactive oxygen species (ROS), but the molecular mechanisms that activate Drp-1 are not known. The purpose of this study was to establish a link between Thbs-1 and fission protein (Drp-1) through Pgc-1α following IR in advancing age. METHODS Female Fischer-344 rats were divided into four groups: Young Control, Young + IR, Old Control, and Old + IR. Heart function and coronary flow were evaluated at baseline and 72 hours after IR, hearts were explanted and mitochondrial ROS generation was measured using MitoPY1, as well as protein levels of Thbs-1, Pgc-1α, and Drp-1. In vitro, rat aortic endothelial cells (RAEC) were treated with siRNA or plasmid for Pgc-1α to evaluate Pgc-1α effect on Drp-1. RESULTS Mitochondrial ROS generation in heart tissue increased in both age groups following IR. Old animals exhibited diastolic dysfunction at baseline; after IR they displayed reduced systolic function and exacerbated diastolic dysfunction compared to young controls. IR increased Thbs-1 and Drp-1 expression in young and old hearts compared to control. siRNA to Pgc-1α enhanced levels of Drp-1 in RAECs and increased ROS generation after hypoxia, while Pgc-1α plasmid ameliorates Drp-1 expression in the presence of exogenous Thbs-1. CONCLUSION These results highlight a novel signaling pathway by which Thbs-1 regulates mitochondrial fission protein (Drp-1) and ROS generation during hypoxia, and presumably, following IR. Inhibiting Thbs-1 immediately after IR may prevent Drp-1-mediated mitochondrial fission and is likely to improve the diastolic function of the heart by reducing ROS-mediated cardiomyocyte damage in the aged population.
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Affiliation(s)
- Natia Q. Kelm
- Cardiovascular Innovation InstituteUniversity of LouisvilleLouisvilleKYUSA
| | - Jason E. Beare
- Cardiovascular Innovation InstituteUniversity of LouisvilleLouisvilleKYUSA
- Kentucky Spinal Cord Injury Research CenterUniversity of LouisvilleLouisvilleKYUSA
| | | | - Amanda J. LeBlanc
- Cardiovascular Innovation InstituteUniversity of LouisvilleLouisvilleKYUSA
- Department of PhysiologyUniversity of LouisvilleLouisvilleKYUSA
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29
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Mitochondrial ROS in myocardial ischemia reperfusion and remodeling. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165768. [PMID: 32173461 DOI: 10.1016/j.bbadis.2020.165768] [Citation(s) in RCA: 196] [Impact Index Per Article: 49.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 03/03/2020] [Accepted: 03/09/2020] [Indexed: 12/19/2022]
Abstract
Despite major progress in interventional and medical treatments, myocardial infarction (MI) and subsequent development of heart failure (HF) are still associated with high mortality. Both during ischemia reperfusion (IR) in the acute setting of MI, as well as in the chronic remodeling process following MI, oxidative stress substantially contributes to cardiac damage. Reactive oxygen species (ROS) generated within mitochondria are particular drivers of mechanisms contributing to IR injury, including induction of mitochondrial permeability transition or oxidative damage of intramitochondrial structures and molecules. But even beyond the acute setting, mechanisms like inflammatory signaling, extracellular remodeling, or pro-apoptotic signaling that contribute to post-infarction remodeling are regulated by mitochondrial ROS. In the current review, we discuss both sources and consequences of mitochondrial ROS during IR and in the chronic setting following MI, thereby emphasizing the potential therapeutic value of attenuating mitochondrial ROS to improve outcome and prognosis for patients suffering MI.
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30
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Makrecka‐Kuka M, Liepinsh E, Murray AJ, Lemieux H, Dambrova M, Tepp K, Puurand M, Käämbre T, Han WH, Goede P, O'Brien KA, Turan B, Tuncay E, Olgar Y, Rolo AP, Palmeira CM, Boardman NT, Wüst RCI, Larsen TS. Altered mitochondrial metabolism in the insulin-resistant heart. Acta Physiol (Oxf) 2020; 228:e13430. [PMID: 31840389 DOI: 10.1111/apha.13430] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 12/05/2019] [Accepted: 12/06/2019] [Indexed: 12/12/2022]
Abstract
Obesity-induced insulin resistance and type 2 diabetes mellitus can ultimately result in various complications, including diabetic cardiomyopathy. In this case, cardiac dysfunction is characterized by metabolic disturbances such as impaired glucose oxidation and an increased reliance on fatty acid (FA) oxidation. Mitochondrial dysfunction has often been associated with the altered metabolic function in the diabetic heart, and may result from FA-induced lipotoxicity and uncoupling of oxidative phosphorylation. In this review, we address the metabolic changes in the diabetic heart, focusing on the loss of metabolic flexibility and cardiac mitochondrial function. We consider the alterations observed in mitochondrial substrate utilization, bioenergetics and dynamics, and highlight new areas of research which may improve our understanding of the cause and effect of cardiac mitochondrial dysfunction in diabetes. Finally, we explore how lifestyle (nutrition and exercise) and pharmacological interventions can prevent and treat metabolic and mitochondrial dysfunction in diabetes.
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Affiliation(s)
| | | | - Andrew J. Murray
- Department of Physiology, Development and Neuroscience University of Cambridge Cambridge UK
| | - Hélène Lemieux
- Department of Medicine Faculty Saint‐Jean, Women and Children's Health Research Institute University of Alberta Edmonton AB Canada
| | | | - Kersti Tepp
- National Institute of Chemical Physics and Biophysics Tallinn Estonia
| | - Marju Puurand
- National Institute of Chemical Physics and Biophysics Tallinn Estonia
| | - Tuuli Käämbre
- National Institute of Chemical Physics and Biophysics Tallinn Estonia
| | - Woo H. Han
- Faculty Saint‐Jean University of Alberta Edmonton AB Canada
| | - Paul Goede
- Laboratory of Endocrinology Amsterdam Gastroenterology & Metabolism Amsterdam University Medical Center University of Amsterdam Amsterdam The Netherlands
| | - Katie A. O'Brien
- Department of Physiology, Development and Neuroscience University of Cambridge Cambridge UK
| | - Belma Turan
- Laboratory of Endocrinology Amsterdam Gastroenterology & Metabolism Amsterdam University Medical Center University of Amsterdam Amsterdam The Netherlands
| | - Erkan Tuncay
- Department of Biophysics Faculty of Medicine Ankara University Ankara Turkey
| | - Yusuf Olgar
- Department of Biophysics Faculty of Medicine Ankara University Ankara Turkey
| | - Anabela P. Rolo
- Department of Life Sciences University of Coimbra and Center for Neurosciences and Cell Biology University of Coimbra Coimbra Portugal
| | - Carlos M. Palmeira
- Department of Life Sciences University of Coimbra and Center for Neurosciences and Cell Biology University of Coimbra Coimbra Portugal
| | - Neoma T. Boardman
- Cardiovascular Research Group Department of Medical Biology UiT the Arctic University of Norway Tromso Norway
| | - Rob C. I. Wüst
- Laboratory for Myology Department of Human Movement Sciences Faculty of Behavioural and Movement Sciences Amsterdam Movement Sciences Vrije Universiteit Amsterdam Amsterdam The Netherlands
| | - Terje S. Larsen
- Cardiovascular Research Group Department of Medical Biology UiT the Arctic University of Norway Tromso Norway
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31
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Chen CY, Li SJ, Wang CY, Mersmann HJ, Ding ST. The impact of DRP1 on myocardial fibrosis in the obese minipig. Eur J Clin Invest 2020; 50:e13204. [PMID: 31990365 DOI: 10.1111/eci.13204] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 01/21/2020] [Accepted: 01/23/2020] [Indexed: 12/11/2022]
Abstract
BACKGROUND The heart is a highly oxidative tissue, thus mitochondria play a major role in maintaining optimal cardiac function. Our previous study established a dietary-induced obese minipig with cardiac fibrosis. The aim of this study was to elucidate the role of mitochondrial dynamics in cardiac fibrosis of obese minipigs. DESIGN Four-month-old Lee-Sung minipigs were randomly divided into two groups: a control group (C) and an obese group (O) by feeding a control diet or a high-fat diet (HFD) for 6 months. Exposure of H9c2 cardiomyoblasts to palmitate was used to explore the effects of high-fat on induction of myocardial injury in vitro. RESULTS The O pigs displayed greater heart weight and cardiac collagen accumulation. Obese pigs exhibited a lower antioxidant capacity, ATP concentration, and higher oxidative stress in the left ventricle (LV). The HFD caused downregulation in protein expression of PGC-1α and OPA1, and upregulation of DRP1, FIS1, and PINK1 in the LV of O compared to C pigs. Furthermore, palmitate induced apoptosis and decreased ATP content in H9c2 cells. Palmitate elevated the protein expression of DRP1 and PINK1 in these cells. Inhibition of DRP1 protein expression by siDRP1 in H9c2 cells resulted in enhanced ATP and decreased palmitate-induced apoptosis. CONCLUSIONS These results suggest that mitochondrial dynamics were linked to the progression of obesity-related cardiac injury. Inhibition of DRP1 after palmitate exposure in H9c2 cells resulted in improved ATP level and decreased apoptosis in vitro suggesting that mitochondrial fission serves a key role in progression of obesity-induced cardiac fibrosis.
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Affiliation(s)
- Ching-Yi Chen
- Department of Animal Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Sin-Jin Li
- Department of Animal Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Chia-Yu Wang
- Department of Animal Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Harry J Mersmann
- Department of Animal Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Shih-Torng Ding
- Department of Animal Science and Technology, National Taiwan University, Taipei, Taiwan
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32
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Cardiac Insulin Resistance in Heart Failure: The Role of Mitochondrial Dynamics. Int J Mol Sci 2019; 20:ijms20143552. [PMID: 31330848 PMCID: PMC6678249 DOI: 10.3390/ijms20143552] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 07/12/2019] [Accepted: 07/18/2019] [Indexed: 12/15/2022] Open
Abstract
Heart failure (HF) frequently coexists with conditions associated with glucose insufficiency, such as insulin resistance and type 2 diabetes mellitus (T2DM), and patients with T2DM have a significantly high incidence of HF. These two closely related diseases cannot be separated on the basis of their treatment. Some antidiabetic drugs failed to improve cardiac outcomes in T2DM patients, despite lowering glucose levels sufficiently. This may be, at least in part, due to a lack of understanding of cardiac insulin resistance. Basic investigations have revealed the significant contribution of cardiac insulin resistance to the pathogenesis and progression of HF; however, there is no clinical evidence of the definition or treatment of cardiac insulin resistance. Mitochondrial dynamics play an important role in cardiac insulin resistance and HF because they maintain cellular homeostasis through energy production, cell survival, and cell proliferation. The innovation of diagnostic tools and/or treatment targeting mitochondrial dynamics is assumed to improve not only the insulin sensitivity of the myocardium and cardiac metabolism, but also the cardiac contraction function. In this review, we summarized the current knowledge on the correlation between cardiac insulin resistance and progression of HF, and discussed the role of mitochondrial dynamics on the pathogenesis of cardiac insulin resistance and HF. We further discuss the possibility of mitochondria-targeted intervention to improve cardiac metabolism and HF.
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33
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Venditti P, Reed TT, Victor VM, Di Meo S. Insulin resistance and diabetes in hyperthyroidism: a possible role for oxygen and nitrogen reactive species. Free Radic Res 2019; 53:248-268. [PMID: 30843740 DOI: 10.1080/10715762.2019.1590567] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In addition to insulin, glycemic control involves thyroid hormones. However, an excess of thyroid hormone can disturb the blood glucose equilibrium, leading to alterations of carbohydrate metabolism and, eventually, diabetes. Indeed, experimental and clinical hyperthyroidism is often accompanied by abnormal glucose tolerance. A common characteristic of hyperthyroidism and type 2 diabetes is the altered mitochondrial efficiency caused by the enhanced production of reactive oxygen and nitrogen species. It is known that an excess of thyroid hormone leads to increased oxidant production and mitochondrial oxidative damage. It can be hypothesised that these species represent the link between hyperthyroidism and development of insulin resistance and diabetes, even though direct evidence of this relationship is lacking. In this review, we examine the literature concerning the effects of insulin and thyroid hormones on glucose metabolism and discuss alterations of glucose metabolism in hyperthyroid conditions and the cellular and molecular mechanisms that may underline them.
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Affiliation(s)
- Paola Venditti
- a Dipartimento di Biologia , Università di Napoli Federico II , Napoli , Italy
| | - Tanea T Reed
- b Department of Chemistry , Eastern Kentucky University , Richmond , KY , USA
| | - Victor M Victor
- c Service of Endocrinology, Dr. Peset University Hospital, Foundation for the Promotion of Health and Biomedical Research in the Valencian Region (FISABIO) , Valencia , Spain.,d Department of Physiology , University of Valencia , Valencia , Spain
| | - Sergio Di Meo
- a Dipartimento di Biologia , Università di Napoli Federico II , Napoli , Italy
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34
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Ong SB, Lee WH, Shao NY, Ismail NI, Katwadi K, Lim MM, Kwek XY, Michel NA, Li J, Newson J, Tahmasebi S, Rehman J, Kodo K, Jang HR, Ong SG. Calpain Inhibition Restores Autophagy and Prevents Mitochondrial Fragmentation in a Human iPSC Model of Diabetic Endotheliopathy. Stem Cell Reports 2019; 12:597-610. [PMID: 30799273 PMCID: PMC6411483 DOI: 10.1016/j.stemcr.2019.01.017] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 01/17/2019] [Accepted: 01/17/2019] [Indexed: 02/09/2023] Open
Abstract
The relationship between diabetes and endothelial dysfunction remains unclear, particularly the association with pathological activation of calpain, an intracellular cysteine protease. Here, we used human induced pluripotent stem cells-derived endothelial cells (iPSC-ECs) to investigate the effects of diabetes on vascular health. Our results indicate that iPSC-ECs exposed to hyperglycemia had impaired autophagy, increased mitochondria fragmentation, and was associated with increased calpain activity. In addition, hyperglycemic iPSC-ECs had increased susceptibility to cell death when subjected to a secondary insult-simulated ischemia-reperfusion injury (sIRI). Importantly, calpain inhibition restored autophagy and reduced mitochondrial fragmentation, concurrent with maintenance of ATP production, normalized reactive oxygen species levels and reduced susceptibility to sIRI. Using a human iPSC model of diabetic endotheliopathy, we demonstrated that restoration of autophagy and prevention of mitochondrial fragmentation via calpain inhibition improves vascular integrity. Our human iPSC-EC model thus represents a valuable platform to explore biological mechanisms and new treatments for diabetes-induced endothelial dysfunction.
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Affiliation(s)
- Sang-Bing Ong
- Signature Research Program in Cardiovascular & Metabolic Disorders, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Won Hee Lee
- Department of Basic Medical Sciences, University of Arizona, Phoenix, AZ 85004, USA
| | - Ning-Yi Shao
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Nur Izzah Ismail
- Signature Research Program in Cardiovascular & Metabolic Disorders, Duke-NUS Medical School, Singapore 169857, Singapore; Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Khairunnisa Katwadi
- Signature Research Program in Cardiovascular & Metabolic Disorders, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Mim-Mim Lim
- Signature Research Program in Cardiovascular & Metabolic Disorders, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Xiu-Yi Kwek
- Signature Research Program in Cardiovascular & Metabolic Disorders, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Nathaly Anto Michel
- Signature Research Program in Cardiovascular & Metabolic Disorders, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Jiajun Li
- Department of Pharmacology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Jordan Newson
- Department of Pharmacology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Soroush Tahmasebi
- Department of Pharmacology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Jalees Rehman
- Department of Pharmacology, The University of Illinois College of Medicine, Chicago, IL 60612, USA; Division of Cardiology, Department of Medicine, The University of Illinois College of Medicine, 909 S Wolcott Avenue, Chicago, IL 60612, USA
| | - Kazuki Kodo
- Department of Pediatrics, Keio University School of Medicine, Tokyo 160-8582, Japan
| | - Hye Ryoun Jang
- Division of Nephrology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul 06351 Republic of Korea.
| | - Sang-Ging Ong
- Department of Pharmacology, The University of Illinois College of Medicine, Chicago, IL 60612, USA; Division of Cardiology, Department of Medicine, The University of Illinois College of Medicine, 909 S Wolcott Avenue, Chicago, IL 60612, USA.
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35
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Chang W, Xiao D, Ao X, Li M, Xu T, Wang J. Increased Dynamin‐Related Protein 1–Dependent Mitochondrial Fission Contributes to High‐Fat‐Diet‐Induced Cardiac Dysfunction and Insulin Resistance by Elevating Tafazzin in Mouse Hearts. Mol Nutr Food Res 2019; 63:e1801322. [DOI: 10.1002/mnfr.201801322] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Indexed: 01/17/2023]
Affiliation(s)
- Wenguang Chang
- Center for Regenerative MedicineInstitute for Translational MedicineQingdao University Qingdao 266021 China
| | - Dandan Xiao
- Center for Regenerative MedicineInstitute for Translational MedicineQingdao University Qingdao 266021 China
| | - Xiang Ao
- Center for Regenerative MedicineInstitute for Translational MedicineQingdao University Qingdao 266021 China
| | - Mengyang Li
- Center for Regenerative MedicineInstitute for Translational MedicineQingdao University Qingdao 266021 China
| | - Tao Xu
- Center for Regenerative MedicineInstitute for Translational MedicineQingdao University Qingdao 266021 China
| | - Jianxun Wang
- Center for Regenerative MedicineInstitute for Translational MedicineQingdao University Qingdao 266021 China
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MacMillan-Crow LA, Mayeux PR. Female mice exhibit less renal mitochondrial injury but greater mortality using a comorbid model of experimental sepsis. INTERNAL MEDICINE REVIEW (WASHINGTON, D.C. : ONLINE) 2018; 4:10.18103/imr.v4i10.768. [PMID: 30506014 PMCID: PMC6261321 DOI: 10.18103/imr.v4i10.768] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Given the inherent heterogeneity of the septic patient population and possible comorbid conditions, it is not surprising that the influence of gender on incidence and outcomes are still unclear. The goal of this study was to use a clinically relevant murine model of sepsis, cecal ligation and puncture (CLP) in CD1 mice, with and without uniphrectomy as a comorbid condition to investigate possible gender differences in renal mitochondrial function and dynamics. High resolution respirometry on fresh kidney biopsies was used to measure renal respiratory complex activities. At 18h post-CLP with nephrectomy male mice showed significant reductions in complex I, II, and III activities, while females were less effected; only complex I was significantly reduced from sham mice. Taken together, our studies revealed, for the first time, gender differences in mitochondrial respiratory activity even in the absence of sepsis. We also examined expression of key mitochondrial fission and fusion proteins. In both genders and in both CLP models, protein expression of the primary fission protein, DRP1 was significantly decreased. No changes were observed in female mice in either CLP model; whereas, male mice demonstrated a slight reduction in MFN1 and the short form of OPA1 after CLP, and modest increase in MFN2 with CLP plus nephrectomy. In both genders CLP with nephrectomy produced a greater increase in serum blood urea nitrogen, a biomarker of renal injury, than without nephrectomy. However, CLP with nephrectomy produced significantly lower 96-hour survival in females. Our results suggest that the CLP nephrectomy comorbid model of sepsis may be an appropriate model to study gender differences a select group of predisposed individuals.
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Affiliation(s)
- Lee Ann MacMillan-Crow
- Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, AR 72205
| | - Philip R Mayeux
- Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, AR 72205
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Leptin-induced cardiomyocyte hypertrophy is associated with enhanced mitochondrial fission. Mol Cell Biochem 2018; 454:33-44. [PMID: 30251118 DOI: 10.1007/s11010-018-3450-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Accepted: 09/19/2018] [Indexed: 12/14/2022]
Abstract
Cardiac pathology including hypertrophy has been associated with an imbalance between mitochondrial fission and fusion. Generally, well-balanced mitochondrial fission and fusion are essential for proper functions of mitochondria. Leptin is a 16-kDa appetite-suppressing protein which has been shown to induce cardiomyocyte hypertrophy. In the present study, we determined whether leptin can influence mitochondrial fission or fusion and whether this can be related to its hypertrophic effect. Cardiomyocytes treated for 24 h with 3.1 nM leptin (50 ng/ml), a concentration representing plasma levels in obese individuals, demonstrated an increase in surface area and a significant 1.6-fold increase in the expression of the β-myosin heavy chain. Mitochondrial staining with MitoTracker Green dye showed elongated structures in control cells with an average length of 4.5 µm. Leptin produced a time-dependent increase in mitochondrial fragmentation with decreasing mitochondrial length. The hypertrophic response to leptin was also associated with increased protein levels of the mitochondrial fission protein dynamin-related protein1 (Drp1) although gene expression of Drp1 was unaffected possibly suggesting post-translational modifications of Drp1. Indeed, leptin treatment was associated with decreased levels of phosphorylated Drp1 and increased translocation of Drp1 to the mitochondria thereby demonstrating a pro-fission effect of leptin. As calcineurin may dephosphorylate Drp1, we determined the effect of a calcineurin inhibitor, FK506, which prevented leptin-induced hypertrophy as well as mitochondrial fission and mitochondrial dysfunction. In conclusion, our data show that leptin-induced cardiomyocyte hypertrophy is associated with enhanced mitochondrial fission via a calcineurin-mediated pathway. The ability of leptin to stimulate mitochondrial fission may be important in understanding the role of this protein in cardiac pathology especially that related to mitochondrial dysfunction.
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Hasan P, Saotome M, Ikoma T, Iguchi K, Kawasaki H, Iwashita T, Hayashi H, Maekawa Y. Mitochondrial fission protein, dynamin-related protein 1, contributes to the promotion of hypertensive cardiac hypertrophy and fibrosis in Dahl-salt sensitive rats. J Mol Cell Cardiol 2018; 121:103-106. [PMID: 29981304 DOI: 10.1016/j.yjmcc.2018.07.004] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 06/27/2018] [Accepted: 07/03/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Hypertension promotes cardiac hypertrophy which finally leads to cardiac dysfunction. Although aberrant mitochondrial dynamics is known to be a relevant contributor of pathogenesis in heart disease, little is known about the relationship between mitochondrial dynamics and cardiac hypertrophy. We investigated the pathophysiological roles of Dynamin-related protein1 (Drp1, a mitochondrial fission protein) on the hypertensive cardiac hypertrophy. METHODS & RESULTS Dahl salt-sensitive rats were fed with a low-salt (0.3% NaCl) or a high-salt (8% NaCl) chow to promote hypertension with and without administration of mdivi1 (an inhibitor of Drp1: 1 mg/kg/every alternative day), and then the hypertensive cardiac hypertrophy was assessed. High-salt fed rats exhibited left ventricular hypertrophy (LVH), myocytes hypertrophy, and cardiac fibrosis, and mdivi-1 suppressed them without alteration of the blood pressure. Mdivi1 also reduced ROS production by hypertension, which subsequently suppressed the Ca2+-activated protein phosphatase calcineurin and Ca2+/calmodulin-dependent kinase II (CaMKII). CONCLUSIONS Our results suggest that Drp1 contributes to the pathogenesis of hypertensive cardiac hypertrophy via ROS production and the Drp1 suppression may be effective to prevent the hypertensive cardiac hypertrophy.
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Affiliation(s)
- Prottoy Hasan
- Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Masao Saotome
- Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, Hamamatsu, Japan.
| | - Takenori Ikoma
- Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Keisuke Iguchi
- Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Hideya Kawasaki
- Regenerative and Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Toshihide Iwashita
- Regenerative and Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Hideharu Hayashi
- Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Yuichiro Maekawa
- Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, Hamamatsu, Japan
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Siasos G, Tsigkou V, Kosmopoulos M, Theodosiadis D, Simantiris S, Tagkou NM, Tsimpiktsioglou A, Stampouloglou PK, Oikonomou E, Mourouzis K, Philippou A, Vavuranakis M, Stefanadis C, Tousoulis D, Papavassiliou AG. Mitochondria and cardiovascular diseases-from pathophysiology to treatment. ANNALS OF TRANSLATIONAL MEDICINE 2018; 6:256. [PMID: 30069458 DOI: 10.21037/atm.2018.06.21] [Citation(s) in RCA: 162] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Mitochondria are the source of cellular energy production and are present in different types of cells. However, their function is especially important for the heart due to the high demands in energy which is achieved through oxidative phosphorylation. Mitochondria form large networks which regulate metabolism and the optimal function is achieved through the balance between mitochondrial fusion and mitochondrial fission. Moreover, mitochondrial function is upon quality control via the process of mitophagy which removes the damaged organelles. Mitochondrial dysfunction is associated with the development of numerous cardiac diseases such as atherosclerosis, ischemia-reperfusion (I/R) injury, hypertension, diabetes, cardiac hypertrophy and heart failure (HF), due to the uncontrolled production of reactive oxygen species (ROS). Therefore, early control of mitochondrial dysfunction is a crucial step in the therapy of cardiac diseases. A number of anti-oxidant molecules and medications have been used but the results are inconsistent among the studies. Eventually, the aim of future research is to design molecules which selectively target mitochondrial dysfunction and restore the capacity of cellular anti-oxidant enzymes.
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Affiliation(s)
- Gerasimos Siasos
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece.,Division of Cardiovascular, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Vasiliki Tsigkou
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Marinos Kosmopoulos
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Dimosthenis Theodosiadis
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Spyridon Simantiris
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Nikoletta Maria Tagkou
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Athina Tsimpiktsioglou
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Panagiota K Stampouloglou
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Evangelos Oikonomou
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Konstantinos Mourouzis
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Anastasios Philippou
- Department of Experimental Physiology, Medical School, National and Kapodistrian University of Athens, Greece
| | - Manolis Vavuranakis
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | | | - Dimitris Tousoulis
- Department of Cardiology, "Hippokration" General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Athanasios G Papavassiliou
- Department of Biological Chemistry, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
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Abstract
Reactive oxygen species (ROS) are well known for their role in mediating both physiological and pathophysiological signal transduction. Enzymes and subcellular compartments that typically produce ROS are associated with metabolic regulation, and diseases associated with metabolic dysfunction may be influenced by changes in redox balance. In this review, we summarize the current literature surrounding ROS and their role in metabolic and inflammatory regulation, focusing on ROS signal transduction and its relationship to disease progression. In particular, we examine ROS production in compartments such as the cytoplasm, mitochondria, peroxisome, and endoplasmic reticulum and discuss how ROS influence metabolic processes such as proteasome function, autophagy, and general inflammatory signaling. We also summarize and highlight the role of ROS in the regulation metabolic/inflammatory diseases including atherosclerosis, diabetes mellitus, and stroke. In order to develop therapies that target oxidative signaling, it is vital to understand the balance ROS signaling plays in both physiology and pathophysiology, and how manipulation of this balance and the identity of the ROS may influence cellular and tissue homeostasis. An increased understanding of specific sources of ROS production and an appreciation for how ROS influence cellular metabolism may help guide us in the effort to treat cardiovascular diseases.
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Affiliation(s)
- Steven J Forrester
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA
| | - Daniel S Kikuchi
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA
| | - Marina S Hernandes
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA
| | - Qian Xu
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA
| | - Kathy K Griendling
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA.
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Law BA, Liao X, Moore KS, Southard A, Roddy P, Ji R, Szulc Z, Bielawska A, Schulze PC, Cowart LA. Lipotoxic very-long-chain ceramides cause mitochondrial dysfunction, oxidative stress, and cell death in cardiomyocytes. FASEB J 2018; 32:1403-1416. [PMID: 29127192 DOI: 10.1096/fj.201700300r] [Citation(s) in RCA: 133] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Accumulating data support a role for bioactive lipids as mediators of lipotixicity in cardiomyocytes. One class of these, the ceramides, constitutes a family of molecules that differ in structure and are synthesized by distinct enzymes, ceramide synthase (CerS)1-CerS6. Data support that specific ceramides and the enzymes that catalyze their formation play distinct roles in cell function. In a mouse model of diabetic cardiomyopathy, sphingolipid profiling revealed increases in not only the CerS5-derived ceramides but also in very long chain (VLC) ceramides derived from CerS2. Overexpression of CerS2 elevated VLC ceramides caused insulin resistance, oxidative stress, mitochondrial dysfunction, and mitophagy. Palmitate induced CerS2 and oxidative stress, mitophagy, and apoptosis, which were prevented by depletion of CerS2. Neither overexpression nor knockdown of CerS5 had any function in these processes, suggesting a chain-length dependent impact of ceramides on mitochondrial function. This concept was also supported by the observation that synthetic mitochondria-targeted ceramides led to mitophagy in a manner proportional to N-acyl chain length. Finally, blocking mitophagy exacerbated cell death. Taken together, our results support a model by which CerS2 and VLC ceramides have a distinct role in lipotoxicity, leading to mitochondrial damage, which results in subsequent adaptive mitophagy. Our data reveal a novel lipotoxic pathway through CerS2.-Law, B. A., Liao, X., Moore, K. S., Southard, A., Roddy, P., Ji, R., Szulc, Z., Bielawska, A., Schulze, P. C., Cowart, L. A. Lipotoxic very-long-chain ceramides cause mitochondrial dysfunction, oxidative stress, and cell death in cardiomyocytes.
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Affiliation(s)
- Brittany A Law
- Department of Medicine-Cardiology, Duke University Medical Center, Durham, North Carolina, USA
| | - Xianghai Liao
- Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Kelsey S Moore
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - Abigail Southard
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - Patrick Roddy
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - Ruiping Ji
- Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Zdzislaw Szulc
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - Ala Bielawska
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - P Christian Schulze
- Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York, New York, USA.,Division of Cardiology, Angiology, Pneumology, and Intensive Medical Care, Department of Internal Medicine I, Friedrich-Schiller-University Jena, University of Jena, Jena, Germany; and
| | - L Ashley Cowart
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA.,Department of Veteran's Affairs, Charleston, South Carolina, USA
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Mitochondria and Sex-Specific Cardiac Function. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1065:241-256. [PMID: 30051389 DOI: 10.1007/978-3-319-77932-4_16] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The focus of this chapter is the gender differences in mitochondria in cardiovascular disease. There is broad evidence suggesting that some of the gender differences in cardiovascular outcome may be partially related to differences in mitochondrial biology (Ventura-Clapier R, Moulin M, Piquereau J, Lemaire C, Mericskay M, Veksler V, Garnier A, Clin Sci (Lond) 131(9):803-822, 2017)). Mitochondrial disorders are causally affected by mutations in either nuclear or mitochondrial genes involved in the synthesis of respiratory chain subunits or in their posttranslational control. This can be due to mutations of the mtDNA which are transmitted by the mother or mutations in the nuclear DNA. Because natural selection on mitochondria operates only in females, mutations may have had more deleterious effects in males than in females (Ventura-Clapier R, Moulin M, Piquereau J, Lemaire C, Mericskay M, Veksler V, Garnier A, Clin Sci (Lond) 131(9):803-822, 2017; Camara AK, Lesnefsky EJ, Stowe DF. Antioxid Redox Signal 13(3):279-347, 2010). As mitochondrial mutations can affect all tissues, they are responsible for a large panel of pathologies including neuromuscular disorders, encephalopathies, metabolic disorders, cardiomyopathies, neuropathies, renal dysfunction, etc. Many of these pathologies present sex/gender specificity. Thus, alleviating or preventing mitochondrial dysfunction will contribute to mitigating the severity or progression of the development of diseases. Here, we present evidence for the involvement of mitochondria in the sex specificity of cardiovascular disorders.
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Abstract
Mitochondrial activity in cells must be tightly controlled in response to changes in intracellular circumstances. Despite drastic changes in intracellular conditions and mitochondrial morphology, it is not clear how mitochondrial activity is controlled during M phase of the cell cycle. Here, we show that mitochondrial activity is drastically changed during M phase. Mitochondrial membrane potential changed during M phase progression. Mitochondria were polarized until metaphase to the same extent as mitochondria in interphase cells, but were depolarized at around telophase and cytokinesis. After cytokinesis, mitochondrial membrane potential was recovered. In addition, the generation of superoxide anions in mitochondria was significantly reduced at metaphase even in the presence of antimycin A, an inhibitor of complex III. These results suggest that the electron supply to the mitochondrial electron transfer chain is suppressed during M phase. This suppression might decrease the reactive oxygen species generated by the fragmentation of mitochondria during M phase.
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Renal cold storage followed by transplantation impairs expression of key mitochondrial fission and fusion proteins. PLoS One 2017; 12:e0185542. [PMID: 28977005 PMCID: PMC5627902 DOI: 10.1371/journal.pone.0185542] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 09/14/2017] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND The majority of transplanted kidneys are procured from deceased donors which all require exposure to cold storage (CS) for successful transplantation. Unfortunately, this CS leads to renal and mitochondrial damage but, specific mitochondrial targets affected by CS remain largely unknown. The goal of this study is to determine whether pathways involved with mitochondrial fusion or fission, are disrupted during renal CS. METHODS Male Lewis rat kidneys were exposed to cold storage (CS) alone or cold storage combined with transplantation (CS/Tx). To compare effects induced by CS, kidney transplantation without CS exposure (autotransplantation; ATx) was also used. Mitochondrial function was assessed using high resolution respirometry. Expression of mitochondrial fusion and fission proteins were monitored using Western blot analysis. RESULTS CS alone (no Tx) reduced respiratory complex I and II activities along with reduced expression of the primary mitochondrial fission protein, dynamin related protein (DRP1), induced loss of the long form of Optic Atrophy Protein (OPA1), and altered the mitochondrial protease, OMA1, which regulates OPA1 processing. CS followed by Tx (CS/Tx) reduced complex I, II, and III activities, and induced a profound loss of the long and short forms of OPA1, mitofusin 1 (MFN1), and mitofusin 2 (MFN2) which all control mitochondrial fusion. In addition, expression of DRP1, along with its primary receptor protein, mitochondrial fission factor (MFF), were also reduced after CS/Tx. Interestingly, CS/Tx lead to aberrant higher molecular weight OMA1 aggregate expression. CONCLUSIONS Our results suggest that CS appears to involve activation of the OMA1, which could be a key player in proteolysis of the fusion and fission protein machinery following transplantation. These findings raise the possibility that impaired mitochondrial fission and fusion may be unrecognized contributors to CS induced mitochondrial injury and compromised renal graft function after transplantation.
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45
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Kim S, Kim C, Park S. Mdivi-1 Protects Adult Rat Hippocampal Neural Stem Cells against Palmitate-Induced Oxidative Stress and Apoptosis. Int J Mol Sci 2017; 18:E1947. [PMID: 28891994 PMCID: PMC5618596 DOI: 10.3390/ijms18091947] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/07/2017] [Accepted: 09/08/2017] [Indexed: 02/06/2023] Open
Abstract
Palmitate concentrations in type 2 diabetic patients are higher than in healthy subjects. The prolonged elevation of plasma palmitate levels induces oxidative stress and mitochondrial dysfunction in neuronal cells. In this study, we examined the role of mdivi-1, a selective inhibitor of mitochondrial fission protein dynamin-regulated protein 1 (Drp1), on the survival of cultured hippocampal neural stem cells (NSCs) exposed to high palmitate. Treatment of hippocampal NSCs with mdivi-1 attenuated palmitate-induced increase in cell death and apoptosis. Palmitate exposure significantly increased Drp1 protein levels, which were prevented by pretreatment of cells with mdivi-1. We found that cytosolic Drp1 was translocated to the mitochondria when cells were exposed to palmitate. In contrast, palmitate-induced translocation of Drp1 was inhibited by mdivi-1 treatment. We also investigated mdivi-1 regulation of apoptosis at the mitochondrial level. Mdivi-1 rescued cells from palmitate-induced lipotoxicity by suppressing intracellular and mitochondrial reactive oxygen species production and stabilizing mitochondrial transmembrane potential. Mdivi-1-treated cells showed an increased Bcl-2/Bax ratio, prevention of cytochrome c release, and inhibition of caspase-3 activation. Our data suggest that mdivi-1 protects hippocampal NSCs against lipotoxicity-associated oxidative stress by preserving mitochondrial integrity and inhibiting mitochondrial apoptotic cascades.
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Affiliation(s)
- Sehee Kim
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Korea.
| | - Chanyang Kim
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Korea.
| | - Seungjoon Park
- Department of Pharmacology and Medical Research Center for Bioreaction to ROS and Biomedical Science Institute, School of Medicine, Kyung Hee University, Seoul 02447, Korea.
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46
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Nan J, Zhu W, Rahman M, Liu M, Li D, Su S, Zhang N, Hu X, Yu H, Gupta MP, Wang J. Molecular regulation of mitochondrial dynamics in cardiac disease. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:1260-1273. [DOI: 10.1016/j.bbamcr.2017.03.006] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 01/25/2017] [Accepted: 03/14/2017] [Indexed: 12/31/2022]
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47
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Mechano-sensitivity of mitochondrial function in mouse cardiac myocytes. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2017; 130:315-322. [PMID: 28668597 DOI: 10.1016/j.pbiomolbio.2017.05.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Revised: 05/19/2017] [Accepted: 05/23/2017] [Indexed: 10/19/2022]
Abstract
Mitochondria are an important source of reactive oxygen species (ROS). Although it has been reported that myocardial stretch increases cellular ROS production by activating nicotinamide adenine dinucleotide phosphate (NADPH) oxidase 2 (NOX2), referred to as X-ROS signalling, the involvement of mitochondria in X-ROS is not clear. Mitochondria are organelles that generate adenosine triphosphate (ATP) for cellular energy needs, which are mechanical-load-dependent. Therefore, it would not be surprising if these organelles had mechano-sensitive functions associated with stretch-induced ROS production. In the present study, we investigated the relation between X-ROS and mitochondrial stretch-sensitive responses in isolated mouse cardiac myocytes. The cells were subjected to 10% axial stretch using computer-controlled, piezo-manipulated carbon fibres attached to both cell ends. Cellular ROS production and mitochondrial membrane potential (Δψm) were assessed optically by confocal microscopy. The axial stretch increased ROS production and hyperpolarised Δψm. Treatment with a mitochondrial metabolic uncoupler, carbonyl cyanide-p-trifluoromethoxyphenylhydrazone (FCCP), at 0.5 μM did not suppress stretch-induced ROS production, whereas treatment with a respiratory Complex III inhibitor, antimycin A (5 μM), blunted the response. Although NOX inhibition by apocynin abrogated the stretch-induced ROS production, it did not suppress stretch-induced hyperpolarisation of Δψm. These results suggest that stretch causes activation of the respiratory chain to hyperpolarise Δψm, followed by NOX activation, which increases ROS production.
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Tune JD, Goodwill AG, Sassoon DJ, Mather KJ. Cardiovascular consequences of metabolic syndrome. Transl Res 2017; 183:57-70. [PMID: 28130064 PMCID: PMC5393930 DOI: 10.1016/j.trsl.2017.01.001] [Citation(s) in RCA: 280] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 12/22/2016] [Accepted: 01/03/2017] [Indexed: 01/18/2023]
Abstract
The metabolic syndrome (MetS) is defined as the concurrence of obesity-associated cardiovascular risk factors including abdominal obesity, impaired glucose tolerance, hypertriglyceridemia, decreased HDL cholesterol, and/or hypertension. Earlier conceptualizations of the MetS focused on insulin resistance as a core feature, and it is clearly coincident with the above list of features. Each component of the MetS is an independent risk factor for cardiovascular disease and the combination of these risk factors elevates rates and severity of cardiovascular disease, related to a spectrum of cardiovascular conditions including microvascular dysfunction, coronary atherosclerosis and calcification, cardiac dysfunction, myocardial infarction, and heart failure. While advances in understanding the etiology and consequences of this complex disorder have been made, the underlying pathophysiological mechanisms remain incompletely understood, and it is unclear how these concurrent risk factors conspire to produce the variety of obesity-associated adverse cardiovascular diseases. In this review, we highlight current knowledge regarding the pathophysiological consequences of obesity and the MetS on cardiovascular function and disease, including considerations of potential physiological and molecular mechanisms that may contribute to these adverse outcomes.
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Affiliation(s)
- Johnathan D Tune
- Department of Cellular & Integrative Physiology, Indiana University School of Medicine, Indianapolis, Ind.
| | - Adam G Goodwill
- Department of Cellular & Integrative Physiology, Indiana University School of Medicine, Indianapolis, Ind
| | - Daniel J Sassoon
- Department of Cellular & Integrative Physiology, Indiana University School of Medicine, Indianapolis, Ind
| | - Kieren J Mather
- Department of Cellular & Integrative Physiology, Indiana University School of Medicine, Indianapolis, Ind; Department of Medicine, Indiana University School of Medicine, Indianapolis, Ind
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Sakamoto A, Saotome M, Hasan P, Satoh T, Ohtani H, Urushida T, Katoh H, Satoh H, Hayashi H. Eicosapentaenoic acid ameliorates palmitate-induced lipotoxicity via the AMP kinase/dynamin-related protein-1 signaling pathway in differentiated H9c2 myocytes. Exp Cell Res 2017; 351:109-120. [PMID: 28088331 DOI: 10.1016/j.yexcr.2017.01.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Revised: 12/20/2016] [Accepted: 01/09/2017] [Indexed: 11/16/2022]
Abstract
BACKGROUND Emerging evidence suggested the preferable effects of eicosapentaenoic acid (EPA; n-3 polyunsaturated fatty acid) against cardiac lipotoxicity, which worsens cardiac function by means of excessive serum free fatty acids due to chronic adrenergic stimulation under heart failure. Nonetheless, the precise molecular mechanisms remain elusive. In this study, we focused on dynamin-related protein-1 (Drp1) as a possible modulator of the EPA-mediated cardiac protection against cardiac lipotoxicity, and investigated the causal relation between AMP-activated protein kinase (AMPK) and Drp1. METHODS AND RESULTS When differentiated H9c2 myocytes were exposed to palmitate (PAL; saturated fatty acid, 400µM) for 24h, these myocytes showed activation of caspases 3 and 7, enhanced caspase 3 cleavage, depolarized mitochondrial membrane potential, depleted intracellular ATP, and enhanced production of intracellular reactive oxygen species. These changes suggested lipotoxicity due to excessive PAL. PAL enhanced mitochondrial fragmentation with increased Drp1 expression, as well. EPA (50µM) restored the PAL-induced apoptosis, mitochondrial dysfunction, and mitochondrial fragmentation with increased Drp1 expression by PAL. EPA activated phosphorylation of AMPK, and pharmacological activation of AMPK by 5-aminoimidazole-4-carboxamide ribonucleotide ameliorated the PAL-induced apoptosis, mitochondrial dysfunction, and downregulated Drp1. An AMPK knockdown via RNA interference enhanced Drp1 expression and attenuated the protective effects of EPA against the PAL-induced lipotoxicity. CONCLUSION EPA ameliorates the PAL-induced lipotoxicity via AMPK activation, which subsequently suppresses mitochondrial fragmentation and Drp1 expression. Our findings may provide new insights into the molecular mechanisms of EPA-mediated myocardial protection in heart failure.
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Affiliation(s)
- Atsushi Sakamoto
- Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan
| | - Masao Saotome
- Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan.
| | - Prottoy Hasan
- Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan
| | - Terumori Satoh
- Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan
| | - Hayato Ohtani
- Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan
| | - Tsuyoshi Urushida
- Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan
| | - Hideki Katoh
- Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan
| | - Hiroshi Satoh
- Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan
| | - Hideharu Hayashi
- Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan
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Ong SB, Hausenloy DJ. Mitochondrial Dynamics as a Therapeutic Target for Treating Cardiac Diseases. Handb Exp Pharmacol 2017; 240:251-279. [PMID: 27844171 DOI: 10.1007/164_2016_7] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Mitochondria are dynamic in nature and are able to shift their morphology between elongated interconnected mitochondrial networks and a fragmented disconnected arrangement by the processes of mitochondrial fusion and fission, respectively. Changes in mitochondrial morphology are regulated by the mitochondrial fusion proteins - mitofusins 1 and 2 (Mfn1 and 2), and optic atrophy 1 (Opa1) as well as the mitochondrial fission proteins - dynamin-related peptide 1 (Drp1) and fission protein 1 (Fis1). Despite having a unique spatial arrangement, cardiac mitochondria have been implicated in a variety of disorders including ischemia-reperfusion injury (IRI), heart failure, diabetes, and pulmonary hypertension. In this chapter, we review the influence of mitochondrial dynamics in these cardiac disorders as well as their potential as therapeutic targets in tackling cardiovascular disease.
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Affiliation(s)
- Sang-Bing Ong
- Cardiovascular and Metabolic Disorders (CVMD) Program, Duke-NUS Medical School, 8 College Road, Singapore, 169857, Singapore.
- National Heart Research Institute Singapore, National Heart Centre Singapore, 5 Hospital Drive, Singapore, 169609, Singapore.
| | - Derek J Hausenloy
- Cardiovascular and Metabolic Disorders (CVMD) Program, Duke-NUS Medical School, 8 College Road, Singapore, 169857, Singapore
- National Heart Research Institute Singapore, National Heart Centre Singapore, 5 Hospital Drive, Singapore, 169609, Singapore
- The Hatter Cardiovascular Institute, University College London Hospitals and Medical School, London, UK
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