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Ji X, Bradley JL, Zheng G, Ge W, Xu J, Hu J, He F, Shabnam R, Peberdy MA, Ornato JP, Chen Q, Lesnefsky EJ, Tang W. Cerebral and myocardial mitochondrial injury differ in a rat model of cardiac arrest and cardiopulmonary resuscitation. Biomed Pharmacother 2021; 140:111743. [PMID: 34020243 DOI: 10.1016/j.biopha.2021.111743] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 05/11/2021] [Accepted: 05/13/2021] [Indexed: 11/18/2022] Open
Abstract
Brain mitochondria are more sensitive to global ischemia compared to heart mitochondria. Complex I in the electron transport chain (ETC) is sensitive to ischemic injury and is a major control point of the rate of ADP stimulated oxygen consumption. The purpose of this study was to explore whether changes in cerebral and myocardial mitochondria differ after cardiac arrest. Animals were randomized into 4 groups (n = 6): 1) Sham 2) VF 3) VF+CPR 4) ROSC 1hr. Ventricular Fibrillation (VF) was induced through a guide wire advanced from the right jugular vein into the ventricle and untreated for 8 min. Resuscitation was attempted with a 4J defibrillation after 8 min of cardiopulmonary resuscitation (CPR). Brain mitochondria and cardiac mitochondrial subpopulations were isolated. Calcium retention capacity was measured to assess susceptibility to mitochondrial permeability transition pore opening. ADP stimulated oxygen consumption and ETC activity assays were performed. Brain mitochondria are far more sensitive to injury during cardiac arrest and resuscitation compared to cardiac mitochondria. Complex I is highly sensitive to injury in brain mitochondria. With markedly decreased calcium retention capacity, mitochondria contribute to cerebral reperfusion injury. Therapeutic preservation of cerebral mitochondrial activity and mitochondrial function during cardiac arrest may improve post-resuscitation neurologic function.
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Affiliation(s)
- Xianfei Ji
- Department of Emergency, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China; Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA.
| | - Jennifer L Bradley
- Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA; Department of Microbiology and Immunology, Virginia Commonwealth University, Richmond, VA, USA.
| | - Guanghui Zheng
- Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA.
| | - Weiwei Ge
- Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA.
| | - Jing Xu
- Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA.
| | - Juntao Hu
- Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA.
| | - Fenglian He
- Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA.
| | | | - Mary Ann Peberdy
- Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA; Departments of Internal Medicine and Emergency Medicine, Virginia Commonwealth University Health System, Richmond, VA, USA; Division of Cardiology, Department of Internal Medicine, Virginia Commonwealth University Health System, Richmond, VA, USA.
| | - Joseph P Ornato
- Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA; Department of Emergency Medicine, Virginia Commonwealth University Health System, Richmond, VA, USA.
| | - Qun Chen
- Division of Cardiology, Department of Internal Medicine, Virginia Commonwealth University Health System, Richmond, VA, USA.
| | - Edward J Lesnefsky
- Division of Cardiology, Department of Internal Medicine, Virginia Commonwealth University Health System, Richmond, VA, USA; Medical Service, McGuire Department of Veterans Affairs Medical Center, Richmond, VA, USA; McGuire Research Institute, Richmond, VA, USA.
| | - Wanchun Tang
- Weil Institute of Emergency and Critical Care Research, Virginia Commonwealth University, Richmond, VA, USA; Department of Microbiology and Immunology, Virginia Commonwealth University, Richmond, VA, USA; Department of Emergency Medicine, Virginia Commonwealth University Health System, Richmond, VA, USA.
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Zhou P, Yang X, Yang D, Jiang X, Wang WE, Yue R, Fang Y. Integrin-Linked Kinase Activation Prevents Ventricular Arrhythmias Induced by Ischemia/Reperfusion Via Inhibition of Connexin 43 Remodeling. J Cardiovasc Transl Res 2021; 14:610-618. [PMID: 32144627 PMCID: PMC8397684 DOI: 10.1007/s12265-020-09979-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 02/24/2020] [Indexed: 12/16/2022]
Abstract
Ischemia reperfusion (I/R)-induced arrhythmia is a serious complication in patients with cardiac infarction. Remodeling of connexin (Cx) 43, manifested as phosphorylation, contributes significantly to arrhythmogenesis. Integrin-linked kinase (ILK) attenuated ventricular remodeling and improved cardiac function in rats after myocardial infarction. We hypothesized that ILK, through Cx43 phosphorylation, would be protective against I/R-induced ventricular arrhythmias. Our study showed that I/R-induced ventricular arrhythmias were attenuated by an ILK agonist LPTP and worsened by the ILK inhibitor Cpd22. I/R disrupted Cx43 distribution, but it was partially normalized in the presence of LPTP. Compared with I/R, the phosphorylation of Akt was increased significantly after pretreatment with LPTP. The increase in phosphorylated Akt was physiologically significant because, in the presence of the Akt inhibitor MK2206, the protective effects of LPTP were blocked. This indicated that ILK activation prevented I/R-induced-ventricular arrhythmia, an effect potentially related to inhibition of Cx43 remodeling via Akt activation.
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Affiliation(s)
- Ping Zhou
- Department of Cardiology, The First People's Hospital of Chongqing Liang Jiang New Area, Chongqing, 401121, China
- Department of Cardiology, Chongqing Institute of Cardiology, Daping Hospital, Army Medical University, 10 Changjiang Branch Road,Yuzhong District, Chongqing, 400042, China
| | - Xiaoli Yang
- Department of Cardiology, Chongqing Institute of Cardiology, Daping Hospital, Army Medical University, 10 Changjiang Branch Road,Yuzhong District, Chongqing, 400042, China
| | - Dezhong Yang
- Department of Cardiology, Chongqing Institute of Cardiology, Daping Hospital, Army Medical University, 10 Changjiang Branch Road,Yuzhong District, Chongqing, 400042, China
| | - Xin Jiang
- Department of Cardiology, Chongqing Institute of Cardiology, Daping Hospital, Army Medical University, 10 Changjiang Branch Road,Yuzhong District, Chongqing, 400042, China
| | - Wei Eric Wang
- Department of Cardiology, Chongqing Institute of Cardiology, Daping Hospital, Army Medical University, 10 Changjiang Branch Road,Yuzhong District, Chongqing, 400042, China
| | - Rongchuan Yue
- Department of Cardiology, Chongqing Institute of Cardiology, Daping Hospital, Army Medical University, 10 Changjiang Branch Road,Yuzhong District, Chongqing, 400042, China
| | - Yuqiang Fang
- Department of Cardiology, Chongqing Institute of Cardiology, Daping Hospital, Army Medical University, 10 Changjiang Branch Road,Yuzhong District, Chongqing, 400042, China.
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Garjani A, Vaez H, Delazar A, Rameshrad M, Heshmati Afshar F, Asgharian P. Cardioprotective Effects of Methanolic Extract of Scrophularia frigida on Ischemia-Reperfusion-Induced Injuries in Isolated Rat Heart. IRANIAN JOURNAL OF PHARMACEUTICAL RESEARCH : IJPR 2017; 16:35-45. [PMID: 29844774 PMCID: PMC5963644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Myocardial infarction is a common presentation of coronary artery disease and the leading cause of death worldwide. The present study investigated potential resistance to ischemia-reperfusion (I/R) injuries following administration of methanolic (MeOH) extract of Scrophularia frigida (S. frigida) in isolated rat heart. Male Wistar rat hearts (n= 8-10) were isolated and allowed to equilibrate for 20 min, and then subjected to 30 min regional ischemia followed by 120 min reperfusion. In the control group, Krebs-Henseleit (K/H) solution was perfused. However, in the treatment groups K/H solution containing 1, 5, and 10 µg/cc of extract was infused. In addition, total phenol, total flavonoid content and antioxidant property were evaluated and extract was subjected to phytochemical analysis. Administration of extract improved the flow rate, developed pressure as well as max and min left ventricular dp/dt. Number and duration of VT were significantly reduced by all extract concentrations in ischemic phase. In reperfusion phase, significant decreases in single and total arrhythmias were seen. Furthermore, concentrations of 5 and 10 µg/cc of extract remarkably decreased the infarct size. Generally, the methanolic extract of S. frigida exhibited a protective effect against I/R-induced injures, which might be due to the antioxidant activiies of iridoids and phenolics.
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Affiliation(s)
- Alireza Garjani
- Department of Pharmacology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Haleh Vaez
- Department of Pharmacology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran. ,Student Research Committee, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Abbas Delazar
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran. ,Department of pharmacognosy, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Maryam Rameshrad
- Biotechnology research center, Tabriz University of Medical Sciences, Tabriz, Iran.
| | | | - Parina Asgharian
- Student Research Committee, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran. ,Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran. ,Department of pharmacognosy, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran. ,Corresponding author: E-mail:
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Abstract
Heart failure (HF) is a multifactorial disease brought about by numerous, and oftentimes complex, etiological mechanisms. Although well studied, HF continues to affect millions of people worldwide and current treatments can only prevent further progression of HF. Mitochondria undoubtedly play an important role in the progression of HF, and numerous studies have highlighted mitochondrial components that contribute to HF. This review presents an overview of the role of mitochondrial biogenesis, mitochondrial oxidative stress, and mitochondrial permeability transition pore in HF, discusses ongoing studies that attempt to address the disease through mitochondrial targeting, and provides an insight on how these studies can affect future research on HF treatment.
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Sripetchwandee J, KenKnight SB, Sanit J, Chattipakorn S, Chattipakorn N. Blockade of mitochondrial calcium uniporter prevents cardiac mitochondrial dysfunction caused by iron overload. Acta Physiol (Oxf) 2014; 210:330-41. [PMID: 24034353 DOI: 10.1111/apha.12162] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Revised: 07/15/2013] [Accepted: 08/29/2013] [Indexed: 12/24/2022]
Abstract
AIM Iron overload in the heart can lead to iron-overload cardiomyopathy and cardiac arrhythmia. In the past decades, growing evidence has suggested that cardiac mitochondrial dysfunction is associated with the development of cardiac dysfunction and lethal arrhythmias. Despite these facts, the effect of iron overload on cardiac mitochondrial function is still unclear. In this study, we determined the effects of iron overload on the cardiac mitochondrial function and the routes of cardiac mitochondrial iron uptake. We tested the hypothesis that iron overload can lead to cardiac mitochondrial dysfunction and that mitochondrial calcium uniporter (MCU) plays a major role for cardiac mitochondrial iron uptake under iron-overload condition. Cardiac mitochondrial function was assessed via the determination of mitochondrial swelling, mitochondrial reactive oxygen species (ROS) production and mitochondrial membrane potential changes. METHODS Isolated cardiac mitochondria from male Wistar rats were used in this study. To determine the routes for cardiac mitochondrial iron uptake, isolated mitochondria were exposed to MCU blocker (Ru360), mitochondrial permeability transition pore (mPTP) blocker (cyclosporin A) and an iron chelator (deferoxamine). RESULTS We found that (i) iron overload caused cardiac mitochondrial dysfunction, indicated by increased ROS production, mitochondrial membrane depolarization and mitochondrial swelling; and (ii) only MCU blocker completely protected cardiac mitochondrial dysfunction caused by iron overload. CONCLUSIONS These findings strongly suggest that MCU could be the major route for iron uptake into cardiac mitochondria. The inhibition of MCU could be the novel pharmacological intervention for preventing iron-overload cardiomyopathy.
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Affiliation(s)
- J. Sripetchwandee
- Cardiac Electrophysiology Research and Training Center; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
- Cardiac Electrophysiology Unit; Department of Physiology; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
| | - S. B. KenKnight
- Cardiac Electrophysiology Research and Training Center; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
- Cardiac Electrophysiology Unit; Department of Physiology; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
| | - J. Sanit
- Cardiac Electrophysiology Research and Training Center; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
- Cardiac Electrophysiology Unit; Department of Physiology; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
| | - S. Chattipakorn
- Cardiac Electrophysiology Research and Training Center; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
- Faculty of Dentistry; Chiang Mai University; Chiang Mai Thailand
| | - N. Chattipakorn
- Cardiac Electrophysiology Research and Training Center; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
- Cardiac Electrophysiology Unit; Department of Physiology; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
- Biomedical Engineering Center; Chiang Mai University; Chiang Mai Thailand
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The role of the mitochondrial calcium uniporter in cerebral ischemia/reperfusion injury in rats involves regulation of mitochondrial energy metabolism. Mol Med Rep 2013; 7:1073-80. [PMID: 23426506 DOI: 10.3892/mmr.2013.1321] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2012] [Accepted: 02/05/2013] [Indexed: 11/05/2022] Open
Abstract
The mitochondrial calcium uniporter (MCU) maintains intracellular Ca2+ homeostasis by transporting Ca2+ from the cell cytosol into the mitochondrial matrix and is important for shaping Ca2+ signals and the activation of programmed cell death. Inhibition of MCU by ruthenium red (RR) or Ru360 has previously been reported to protect against neuronal death. The aim of the present study was to analyze the mechanisms underlying the effects of MCU activity in a rat model of cerebral ischemia/reperfusion (I/R) injury. Adult male Wistar rats were divided into 4 groups; sham, I/R, I/R + RR and I/R + spermine (Sper) and were subjected to reversible middle cerebral artery occlusion for 2 h followed by 24 h of reperfusion. A bolus injection of RR administered 30 min prior to ischemia was found to significantly decrease the total infarct volume and reduce neuronal damage and cell apoptosis compared with ischemia/reperfusion values. However, treatment with Sper, an activator of the MCU, increased the injury induced by I/R. Analysis of energy metabolism revealed that I/R induced progressive inhibition of complexes I‑IV of the electron transport chain, decreased ATP production, dissipated the mitochondrial membrane potential and increased the generation of reactive oxygen species. Treatment with RR ameliorated the condition, while spermine had the opposite effect. In conclusion, blocking MCU was demonstrated to exert protective effects against I/R injury and this process may be mediated by the prevention of energy failure.
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Mitochondrial benzodiazepine receptors mediate cardioprotection of estrogen against ischemic ventricular fibrillation. Pharmacol Res 2009; 60:61-7. [PMID: 19427588 DOI: 10.1016/j.phrs.2009.03.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2008] [Revised: 03/04/2009] [Accepted: 03/04/2009] [Indexed: 11/24/2022]
Abstract
The cardioprotective effects of estrogen remain controversial in clinical practice. Previous reports have shown that cardioprotective mechanisms converge on the mitochondria, but the role of mitochondria in estrogen's actions on cardiac arrhythmias is unclear. Here, we report that stimulation or inhibition of mitochondrial benzodiazepine receptors (mBzR) affected ventricular fibrillation (VF) almost in an "all-or-none" manner in an in vitro rat heart model of ischemic VF. Low concentrations of estrogen did not provide antiarrhythmic effects; however, the combination of mBzR activator and estrogen reduced VF incidence in hearts from either gender. Such synergistic actions also enabled cardiomyocytes to resist metabolic stress-induced intracellular [Ca(2+)](i) overload. Ligand binding experiments revealed that estrogen itself did not affect mBzR activity under basal conditions but promoted its up-regulation under myocardial ischemia. Our results suggest that mBzR may be an important molecule for ischemic arrhythmia and may act as a molecular switch for estrogen's antiarrhythmic effects. This finding provides a clue for elucidating the conflicting results regarding estrogen's cardiac effects in clinical studies and also suggests potential new strategies for hormone treatment in the female population.
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