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El-Sayed SF, Abdelhamid AM, ZeinElabdeen SG, El-Wafaey DI, Moursi SMM. Melatonin enhances captopril mediated cardioprotective effects and improves mitochondrial dynamics in male Wistar rats with chronic heart failure. Sci Rep 2024; 14:575. [PMID: 38182706 PMCID: PMC10770053 DOI: 10.1038/s41598-023-50730-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Accepted: 12/23/2023] [Indexed: 01/07/2024] Open
Abstract
Mitochondrial dysfunction is a recent emerging research scope that proved to be involved in many cardiovascular diseases culminating in chronic heart failure (CHF), which remains one of the primary causes of morbidity and mortality. This study investigated the added cardio-protective effects of exogenous melatonin administration to conventional captopril therapy in isoproterenol (ISO) exposed rats with CHF. Five groups of Wistar rats were recruited; (I): Control group, (II): (ISO group), (III): (ISO + captopril group), (IV): (ISO + melatonin group) and (V): (ISO + melatonin/captopril group). Cardiac function parameters and some oxidant, inflammatory and fibrotic markers were investigated. Moreover; mRNA expression of mitochondrial mitophagy [parkin & PTEN induced kinase 1 (PINK1)], biogenesis [Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α)], fusion [mitofusin 2 (Mfn2)] and fission [dynamin-related protein 1 (DRP-1)] parameters in rat's myocardium were evaluated. Rats' myocardium was histo-pathologically and immunohistochemically evaluated for Beclin1 and Sirt3 expression. The present study revealed that captopril and melatonin ameliorated cardiac injury, oxidative stress biomarkers, and pro-inflammatory cytokines in ISO-exposed rats. These protective effects could be attributed to mitochondrial dynamic proteins control (i.e. enhanced the mRNA expression of parkin, PINK1, PGC-1α and Mfn2, while reduced DRP-1 mRNA expression). Also, Beclin1 and Sirt3 cardiac immunoreactivity were improved. Combined captopril and melatonin therapy showed a better response than either agent alone. Melatonin enhanced myocardial mitochondrial dynamics and Sirt3 expression in CHF rats and may represent a promising upcoming therapy added to conventional heart failure treatment.
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Affiliation(s)
- Sherein F El-Sayed
- Medical Physiology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | | | | | - Dalia Ibrahim El-Wafaey
- Human Anatomy and Embryology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt.
| | - Suzan M M Moursi
- Medical Physiology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
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2
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Roy R, York E, Pacchini E, Rawling T. Effects of cationic head group structure on cytotoxicity and mitochondrial actions of amphiphilic ionic liquids. Food Chem Toxicol 2024; 183:114202. [PMID: 38007213 DOI: 10.1016/j.fct.2023.114202] [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: 08/08/2023] [Revised: 10/24/2023] [Accepted: 11/17/2023] [Indexed: 11/27/2023]
Abstract
Ionic liquids (ILs) are a class of low melting point salts with physicochemical properties that make them suitable for a range of industrial applications. Accumulating evidence suggests that certain ILs are cytotoxic and potential environmental pollutants, thus understanding the structural features that promote IL cytotoxicity is important. Amphiphilic ionic liquids (AmILs), a class of ILs with lipophilic N-alkyl chains, containing aromatic head groups are generally more cytotoxic than their aliphatic counterparts, however the impact of other head group properties are less clear. This study therefore sought to provide new structure activity relationship (SAR) insights regarding the role of the cationic head group on AmIL cytotoxicity. A series of AmILs bearing a range of structurally diverse aromatic cations varying in size, charge, and lipophilicity was synthesised and screened against human MDA-MB-231 breast cancer cells. It was found that larger and more lipophilic head groups increased cytotoxicity, although the magnitude of the changes were modest. The mitochondrial effects of representative ILs were assessed. The AmILs induced mitochondrial dysfunction in MDA-MB-231 cells at cytotoxic concentrations, suggesting that they target mitochondria. The new SAR information from this study may assist in the design of AmILs with controlled cytotoxicity.
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Affiliation(s)
- Ritik Roy
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Edward York
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Ethan Pacchini
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Tristan Rawling
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
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3
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Devaux JBL, Hickey AJR, Renshaw GMC. Succinate-mediated reactive oxygen species production in the anoxia-tolerant epaulette ( Hemiscyllium ocellatum) and grey carpet ( Chiloscyllium punctatum) sharks. Biol Lett 2023; 19:20230344. [PMID: 37817574 PMCID: PMC10565405 DOI: 10.1098/rsbl.2023.0344] [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: 07/28/2023] [Accepted: 09/22/2023] [Indexed: 10/12/2023] Open
Abstract
Anoxia/re-oxygenation (AR) results in elevated unchecked oxidative stress and mediates irreversible damage within the brain for most vertebrates. Succinate accumulation within mitochondria of the ischaemic brain appears to increase the production of reactive oxygen species (ROS) upon re-oxygenation. Two closely related elasmobranchs, the epaulette shark (Hemiscyllium ocellatum) and the grey carpet shark (Chiloscyllium punctatum) repeatedly experience near anoxia and re-oxygenation in their habitats and have adapted to survive AR at tropical temperatures without significant brain injuries. However, these anoxia-tolerant species display contrasting strategies to survive AR, with only H. ocellatum having the capacity to supress metabolism and H. ocellatum mitochondria the capacity to depress succinate oxidation post-AR. We measured oxygen consumption alongside ROS production mediated by elevated succinate in mitochondria of permeabilized cerebellum from both shark species. Although mitochondrial respiration remained similar for both species, the ROS production in H. ocellatum was half that of C. punctatum in phosphorylating and non-phosphorylating mitochondria. Maximum ROS production in H. ocellatum was mediated by succinate loads 10-fold higher than in C. punctatum mitochondria. The contrasting survival strategies of anoxia-tolerant sharks reveal the significance of mitigating ROS production under elevated succinate load during AR, shedding light on potential mechanisms to mitigate brain injury.
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Affiliation(s)
- Jules B. L. Devaux
- School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand
| | - Anthony J. R. Hickey
- School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand
| | - Gillian M. C. Renshaw
- Hypoxia and Ischemia Research Unit School of Allied Health Sciences, Griffith University, Gold Coast campus, Queensland 4222, Australia
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4
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Belyaeva EA. Modulators of mitochondrial ATP-sensitive potassium channel affect cytotoxicity of heavy metals: Action on isolated rat liver mitochondria and AS-30D ascites hepatoma cells. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 256:114829. [PMID: 36989557 DOI: 10.1016/j.ecoenv.2023.114829] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 03/06/2023] [Accepted: 03/22/2023] [Indexed: 06/19/2023]
Abstract
Heavy metals are ubiquitous environmental pollutants that are extremely dangerous for public health, but the molecular mechanisms of their cytotoxic action are still not fully understood. In the present work, the possible contribution of the mitochondrial ATP-sensitive potassium channel (mK(ATP)), which is usually considered protective for the cell, to hepatotoxicity caused by heavy metals was investigated using polarography and swelling techniques as well as flow cytometry. Using isolated liver mitochondria from adult male Wistar rats and various potassium media containing or not containing penetrating anions (KNO3, KSCN, KAcet, KCl), we studied the effect of mK(ATP) modulators, namely its blockers (5-hydroxydecanoate, glibenclamide, ATP, ADP) and activators (diazoxide, malonate), on respiration and/or membrane permeability in the presence of hepatotoxins such as Cd2+, Hg2+, and Cu2+. It has been shown for the first time that, contrary to Hg2+ and depending on media used, the mK(ATP) modulators affect Cd2+- and/or Cu2+-induced alterations in mitochondrial swelling and respiration rates, although differently, nevertheless, in the ways compatible with mK(ATP) participation in both these cases. On rat AS-30D ascites hepatoma cells, it was found that, unlike Cd2+, an increase in the production of reactive oxygen species was observed with the simultaneous use of Cu2+ and diazoxide; in addition, there was no protective effect of diazoxide against cell death, which also occurred in the presence of Cu2+. In conclusion, the relationships (functional, structural and/or regulatory) between mK(ATP), components of the mitochondrial electron transport chain (CI, CII-CIII and/or ATP synthase, CV) and mitochondrial permeability transition pores were discussed, as well as the role of these molecular structures in the mechanisms of the cytotoxic action of heavy metals.
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Affiliation(s)
- Elena A Belyaeva
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Thorez av. 44, 194223, St.-Petersburg, Russia.
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5
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Dumbali SP, Wenzel PL. Mitochondrial Permeability Transition in Stem Cells, Development, and Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1409:1-22. [PMID: 35739412 DOI: 10.1007/5584_2022_720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The mitochondrial permeability transition (mPT) is a process that permits rapid exchange of small molecules across the inner mitochondrial membrane (IMM) and thus plays a vital role in mitochondrial function and cellular signaling. Formation of the pore that mediates this flux is well-documented in injury and disease but its regulation has also emerged as critical to the fate of stem cells during embryonic development. The precise molecular composition of the mPTP has been enigmatic, with far more genetic studies eliminating molecular candidates than confirming them. Rigorous studies in the recent decade have implicated central involvement of the F1Fo ATP synthase, or complex V of the electron transport chain, and continue to confirm a regulatory role for Cyclophilin D (CypD), encoded by Ppif, in modulating the sensitivity of the pore to opening. A host of endogenous molecules have been shown to trigger flux characteristic of mPT, including positive regulators such as calcium ions, reactive oxygen species, inorganic phosphate, and fatty acids. Conductance of the pore has been described as low or high, and reversibility of pore opening appears to correspond with the relative abundance of negative regulators of mPT such as adenine nucleotides, hydrogen ion, and divalent cations that compete for calcium-binding sites in the mPTP. Current models suggest that distinct pores could be responsible for differing reversibility and conductance depending upon cellular context. Indeed, irreversible propagation of mPT inevitably leads to collapse of transmembrane potential, arrest of ATP synthesis, mitochondrial swelling, and cell death. Future studies should clarify ambiguities in mPTP structure and reveal new roles for mPT in dictating specialized cellular functions beyond cell survival that are tied to mitochondrial fitness including stem cell self-renewal and fate. The focus of this review is to describe contemporary models of the mPTP and highlight how pore activity impacts stem cells and development.
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Affiliation(s)
- Sandeep P Dumbali
- Department of Integrative Biology & Pharmacology, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Pamela L Wenzel
- Department of Integrative Biology & Pharmacology, The University of Texas Health Science Center at Houston, Houston, TX, USA.
- Center for Stem Cell and Regenerative Medicine, Brown Foundation Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, TX, USA.
- Immunology Program, The University of Texas MD Anderson UTHealth Graduate School of Biomedical Sciences, Houston, TX, USA.
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6
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Ghozy S, Kacimi SEO, Elfil M, Sobeeh MG, Reda A, Kallmes KM, Rabinstein AA, Holmes DR, Brinjikji W, Kadirvel R, Kallmes DF. Transient Ischemic Attacks Preceding Ischemic Stroke and the Possible Preconditioning of the Human Brain: A Systematic Review and Meta-Analysis. Front Neurol 2021; 12:755167. [PMID: 34899573 PMCID: PMC8652229 DOI: 10.3389/fneur.2021.755167] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 10/25/2021] [Indexed: 01/10/2023] Open
Abstract
Stroke is a leading cause of mortality and disability worldwide. Transient ischemic attack (TIA) is defined as transient brain ischemia with temporary neurological deficits. In animal models, prior TIA seems to enhance brain ischemic tolerance to withstand further ischemic events, which might be explained by brain preconditioning. Thus, this review aims to formulate evidence of whether TIAs can induce positive preconditioning and enhance the functional outcomes in patients suffering from subsequent ischemic strokes. Five databases were searched (PubMed, Embase, SAGE, Web of Science, and Scopus), and twelve studies were included in the quantitative analysis. Studies were eligible when comparing patients with acute ischemic stroke (AIS) and previous TIA with those with AIS without TIA. Comparisons included the National Institute of Health Stroke Scale (NIHSS) score at admission and 7 days from the stroke event, modified Rankin score (mRS), and Trial of ORG 10,172 in Acute Stroke Treatment (TOAST) classification. Odds ratio (OR), mean difference (MD), and 95% confidence interval (CI) were used to describe our results using the random effect model. Our results revealed that patients with stroke and prior TIAs had lower NIHSS scores at admission than those without prior TIAs. However, the NIHSS score was not significantly different between the two groups at 7 days. Furthermore, there was no statistically significant difference between both groups in terms of mortality. Despite the differences in the admission mRS score groups, patients with prior TIAs had lower mRS scores at discharge.
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Affiliation(s)
- Sherief Ghozy
- Department of Radiology, Mayo Clinic, Rochester, MN, United States
| | | | - Mohammed Elfil
- Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, United States
| | - Mohamed Gomaa Sobeeh
- Faculty of Physical Therapy, Cairo University, Cairo, Egypt.,Faculty of Physical Therapy, Sinai University, Cairo, Egypt
| | - Abdullah Reda
- Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Kevin M Kallmes
- Nested Knowledge, St. Paul, MN, United States.,Superior Medical Experts, St. Paul, MN, United States
| | - Alejandro A Rabinstein
- Department of Neurology and Neurocritical Care, Mayo Clinic, Rochester, MN, United States
| | - David R Holmes
- Department of Cardiovascular Diseases and Internal Medicine, Mayo Clinic, Rochester, MN, United States
| | - Waleed Brinjikji
- Department of Radiology, Mayo Clinic, Rochester, MN, United States.,Department of Neurosurgery, Mayo Clinic Rochester, Rochester, MN, United States
| | | | - David F Kallmes
- Department of Radiology, Mayo Clinic, Rochester, MN, United States
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7
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Martins-Marques T, Rodriguez-Sinovas A, Girao H. Cellular crosstalk in cardioprotection: Where and when do reactive oxygen species play a role? Free Radic Biol Med 2021; 169:397-409. [PMID: 33892116 DOI: 10.1016/j.freeradbiomed.2021.03.044] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 03/14/2021] [Accepted: 03/25/2021] [Indexed: 12/16/2022]
Abstract
A well-balanced intercellular communication between the different cells within the heart is vital for the maintenance of cardiac homeostasis and function. Despite remarkable advances on disease management and treatment, acute myocardial infarction remains the major cause of morbidity and mortality worldwide. Gold standard reperfusion strategies, namely primary percutaneous coronary intervention, are crucial to preserve heart function. However, reestablishment of blood flow and oxygen levels to the infarcted area are also associated with an accumulation of reactive oxygen species (ROS), leading to oxidative damage and cardiomyocyte death, a phenomenon termed myocardial reperfusion injury. In addition, ROS signaling has been demonstrated to regulate multiple biological pathways, including cell differentiation and intercellular communication. Given the importance of cell-cell crosstalk in the coordinated response after cell injury, in this review, we will discuss the impact of ROS in the different forms of inter- and intracellular communication, as well as the role of gap junctions, tunneling nanotubes and extracellular vesicles in the propagation of oxidative damage in cardiac diseases, particularly in the context of ischemia/reperfusion injury.
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Affiliation(s)
- Tania Martins-Marques
- Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, Coimbra, Portugal; Univ Coimbra, Center for Innovative Biomedicine and Biotechnology (CIBB), Coimbra, Portugal; Clinical Academic Centre of Coimbra (CACC), Coimbra, Portugal
| | - Antonio Rodriguez-Sinovas
- Cardiovascular Diseases Research Group, Department of Cardiology, Vall D'Hebron Institut de Recerca (VHIR), Vall D'Hebron Hospital Universitari, Vall D'Hebron Barcelona Hospital Campus, Passeig Vall D'Hebron, 119-129, 08035, Barcelona, Spain; Departament de Medicina, Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain; Centro de Investigación Biomédica en Red Sobre Enfermedades Cardiovasculares (CIBERCV), Madrid, Spain
| | - Henrique Girao
- Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, Coimbra, Portugal; Univ Coimbra, Center for Innovative Biomedicine and Biotechnology (CIBB), Coimbra, Portugal; Clinical Academic Centre of Coimbra (CACC), Coimbra, Portugal.
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8
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Špaková I, Rabajdová M, Mičková H, Graier WF, Mareková M. Effect of hypoxia factors gene silencing on ROS production and metabolic status of A375 malignant melanoma cells. Sci Rep 2021; 11:10325. [PMID: 33990669 PMCID: PMC8121821 DOI: 10.1038/s41598-021-89792-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 04/29/2021] [Indexed: 01/04/2023] Open
Abstract
The innate response of melanocytes to exogenous or endogenous stress stimuli like extreme pH and temperature, metabolite and oxygen deficiency or a high UV dose initiates a cellular stress response. This process activates adaptive processes to minimize the negative impact of the stressor on the pigment cell. Under physiological conditions, a non-cancer cell is directed to apoptosis if the stressor persists. However, malignant melanoma cells will survive persistent stress thanks to distinct "cancerous" signaling pathways (e.g. MEK) and transcription factors that regulate the expression of so-called "survival genes" (e.g. HIF, MITF). In this survival response of cancer cells, MEK pathway directs melanoma cells to deregulate mitochondrial metabolism, to accumulate reduced species (NADH), and to centralize metabolism in the cytosol. The aim of this work was to study the effect of gene silencing in malignant melanoma A375 cells on metabolic processes in cytosol and mitochondria. Gene silencing of HIF-1α, and miR-210 in normoxia and pseudohypoxia, and analysis of its effect on MITF-M, and PDHA1 expression. Detection of cytosolic NADH by Peredox-mCherry Assay. Detection of OCR, and ECAR using Seahorse XF96. Measurement of produced O2•- with MitoTracker Red CMXRos. 1H NMR analysis of metabolites present in cell suspension, and medium. By gene silencing of HIF-1α and miR-210 the expression of PDHA1 was upregulated while that of MITF-M was downregulated, yielding acceleration of mitochondrial respiratory activity and thus elimination of ROS. Hence, we detected a significantly reduced A375 cell viability, an increase in alanine, inositol, nucleotides, and other metabolites that together define apoptosis. Based on the results of measurements of mitochondrial resipiratory activity, ROS production, and changes in the metabolites obtained in cells under the observed conditions, we concluded that silencing of HIF-1α and miR-210 yields apoptosis and, ultimately, apoptotic cell death in A375 melanoma cells.
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Affiliation(s)
- Ivana Špaková
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, 04011, Košice, Slovakia
| | - Miroslava Rabajdová
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, 04011, Košice, Slovakia.
| | - Helena Mičková
- Department of Biology, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Košice, Slovakia
| | - Wolfgang F Graier
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging Molecular Biology and Biochemistry, Medical University of Graz, Graz, Austria.,BioTechMed, Graz, Austria
| | - Mária Mareková
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, 04011, Košice, Slovakia
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9
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Jász DK, Szilágyi ÁL, Tuboly E, Baráth B, Márton AR, Varga P, Varga G, Érces D, Mohácsi Á, Szabó A, Bozó R, Gömöri K, Görbe A, Boros M, Hartmann P. Reduction in hypoxia-reoxygenation-induced myocardial mitochondrial damage with exogenous methane. J Cell Mol Med 2021; 25:5113-5123. [PMID: 33942485 PMCID: PMC8178286 DOI: 10.1111/jcmm.16498] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/23/2021] [Accepted: 03/05/2021] [Indexed: 12/15/2022] Open
Abstract
Albeit previous experiments suggest potential anti‐inflammatory effect of exogenous methane (CH4) in various organs, the mechanism of its bioactivity is not entirely understood. We aimed to investigate the potential mitochondrial effects and the underlying mechanisms of CH4 in rat cardiomyocytes and mitochondria under simulated ischaemia/reperfusion (sI/R) conditions. Three‐day‐old cultured cardiomyocytes were treated with 2.2% CH4‐artificial air mixture during 2‐hour‐long reoxygenation following 4‐hour‐long anoxia (sI/R and sI/R + CH4, n = 6‐6), with normoxic groups serving as controls (SH and SH + CH4; n = 6‐6). Mitochondrial functions were investigated with high‐resolution respirometry, and mitochondrial membrane injury was detected by cytochrome c release and apoptotic characteristics by using TUNEL staining. CH4 admixture had no effect on complex II (CII)‐linked respiration under normoxia but significantly decreased the complex I (CI)‐linked oxygen consumption. Nevertheless, addition of CH4 in the sI/R + CH4 group significantly reduced the respiratory activity of CII in contrast to CI and the CH4 treatment diminished mitochondrial H2O2 production. Substrate‐induced changes to membrane potential were partially preserved by CH4, and additionally, cytochrome c release and apoptosis of cardiomyocytes were reduced in the CH4‐treated group. In conclusion, the addition of CH4 decreases mitochondrial ROS generation via blockade of electron transport at CI and reduces anoxia‐reoxygenation‐induced mitochondrial dysfunction and cardiomyocyte injury in vitro.
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Affiliation(s)
| | | | - Eszter Tuboly
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
| | - Bálint Baráth
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
| | | | - Petra Varga
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
| | - Gabriella Varga
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
| | - Dániel Érces
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
| | - Árpád Mohácsi
- MTA-SZTE Research Group on Photoacoustic Spectroscopy, University of Szeged, Szeged, Hungary
| | - Anna Szabó
- MTA-SZTE Research Group on Photoacoustic Spectroscopy, University of Szeged, Szeged, Hungary
| | - Renáta Bozó
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - Kamilla Gömöri
- Department of Biochemistry, University of Szeged, Szeged, Hungary
| | - Anikó Görbe
- Department of Biochemistry, University of Szeged, Szeged, Hungary
| | - Mihály Boros
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
| | - Petra Hartmann
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
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10
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Sassetti E, Clausen MH, Laraia L. Small-Molecule Inhibitors of Reactive Oxygen Species Production. J Med Chem 2021; 64:5252-5275. [PMID: 33856791 DOI: 10.1021/acs.jmedchem.0c01914] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Reactive oxygen species (ROS) are involved in physiological cellular processes including differentiation, proliferation, and apoptosis by acting as signaling molecules or regulators of transcription factors. The maintenance of appropriate cellular ROS levels is termed redox homeostasis, a balance between their production and neutralization. High concentrations of ROS may contribute to severe pathological events including cancer, neurodegenerative, and cardiovascular diseases. In recent years, approaches to target the sources of ROS production directly in order to develop tool compounds or potential therapeutics have been explored. Herein, we briefly outline the major sources of cellular ROS production and comprehensively review the targeting of these by small-molecule inhibitors. We critically assess the value of ROS inhibitors with different mechanisms-of-action, including their potency, mode-of-action, known off-target effects, and clinical or preclinical status, while suggesting future avenues of research in the field.
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Affiliation(s)
- Elisa Sassetti
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet 207, 2800 Kgs. Lyngby, Denmark
| | - Mads H Clausen
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet 207, 2800 Kgs. Lyngby, Denmark
| | - Luca Laraia
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet 207, 2800 Kgs. Lyngby, Denmark
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11
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Xiang L, Shao Y, Chen Y. Mitochondrial dysfunction and mitochondrion-targeted therapeutics in liver diseases. J Drug Target 2021; 29:1080-1093. [PMID: 33788656 DOI: 10.1080/1061186x.2021.1909051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The liver is a vital metabolic and detoxifying organ and suffers diverse endogenous or exogenous damage. Hepatocyte mitochondria experience various structural and functional defects from liver injury, bearing oxidative stress, metabolic dysregulation, and the disturbance of mitochondrial quality control (MQC) mechanisms. Mitochondrial malfunction initiates the mitochondria-mediated apoptotic pathways and the release of damage signals, aggravating liver damage and disease progression via inflammation and reparative fibrogenesis. Removal of mitochondrial impairment or the improvement of MQC mechanisms restore mitochondrial homeostasis and benefit liver health. This review discusses the association of mitochondrial disorders with hepatic pathophysiological processes and the resultant potential of mitochondrion-targeting therapeutics for hepatic disorders. The recent advances in the MQC mechanisms and the mitochondrial-derived damage-associated molecular patterns (DAMPs) in the pathology and treatment of liver disease are particularly focussed.
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Affiliation(s)
- Li Xiang
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, China
| | - Yaru Shao
- Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, University of South China, Hengyang, China.,Institute of Pharmacy & Pharmacology, School of Pharmaceutical Science, University of South China, Hengyang, China
| | - Yuping Chen
- Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, University of South China, Hengyang, China.,Institute of Pharmacy & Pharmacology, School of Pharmaceutical Science, University of South China, Hengyang, China
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12
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Mármol F, Sanchez J, Martínez-Pinteño A. Effects of uric acid on oxidative and nitrosative stress and other related parameters in SH-SY5Y human neuroblastoma cells. Prostaglandins Leukot Essent Fatty Acids 2021; 165:102237. [PMID: 33429354 DOI: 10.1016/j.plefa.2020.102237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 12/23/2020] [Accepted: 12/29/2020] [Indexed: 11/16/2022]
Abstract
Uric acid (UA) comprises about 65% of the total antioxidant capacity of plasma. In patients with acute ischemic stroke, UA reduces the incidence of early clinical worsening and improves patient outcomes compared with placebo. It also reduces infarct growth and improves functional outcomes in some patient subgroups, such as those with hyperglycemia pretreatment. Although UA is widely recognized as an important antioxidant in blood, its precise mechanism of action on the CNS is still unclear. Here, we assess how UA produces an antioxidant effect in neuroblastoma cells subjected to oxidative/nitrosative stress. We also evaluate its action on mitochondrial complexes I and III, as well as the capacity of UA to modify cell death induced by oxidative stress. Other related parameters such as BDNF and PGE2 were also determined. We observed that UA is a very powerful antioxidant which efficiently reduces ROS/RNS stress signaling and cell death during oxidative/nitrosative neurotoxicity. This providing evidence that UA could be used to improve disorders in which ROS and RNS play important role, such as ischemic stroke and chronic neurodegeneration, as confirmed by BDNF results. PGE2 results indicate that UA does not modify the inflammation in control neuroblastoma cells despite an increased in PGE2 levels in ischemic situations.
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Affiliation(s)
- Frederic Mármol
- Departament de Fonaments Clínics. Unitat de Farmacologia. Facultat de Medicina. Universitat de Barcelona, c/Casanova, 143, 08036 Barcelona, Spain.
| | - Juan Sanchez
- Departament de Fonaments Clínics. Unitat de Farmacologia. Facultat de Medicina. Universitat de Barcelona, c/Casanova, 143, 08036 Barcelona, Spain
| | - Albert Martínez-Pinteño
- Departament de Fonaments Clínics. Unitat de Farmacologia. Facultat de Medicina. Universitat de Barcelona, c/Casanova, 143, 08036 Barcelona, Spain
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13
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Frantz NL, Brakoniecki G, Chen D, Proshlyakov DA. Assessment of the Maximal Activity of Complex IV in the Inner Mitochondrial Membrane by Tandem Electrochemistry and Respirometry. Anal Chem 2021; 93:1360-1368. [PMID: 33319559 PMCID: PMC8772154 DOI: 10.1021/acs.analchem.0c02910] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Assessment of activities of mitochondrial electron transport enzymes is important for understanding mechanisms of metabolic diseases, but structural organization of mitochondria and low sample availability pose distinctive challenges for in situ functional studies. We report the development of a tandem microfluidic respirometer that simultaneously tracks both the reduction of mediators on the electrode and the ensuing reduction of O2 by complex IV in the inner mitochondrial membrane. The response time of O2 consumption to multiple alternating potential steps is of approximately 10 s for a 150 μm-thick sample. Steady O2 depletion shows good quantitative correlation with the supplied electric charge, Pearson's r = 0.994. Reduction of mediators on biocompatible gold electrodes modified with carbon ink or fumed silica can compete with the oxidation of mediators by mitochondria, yielding an overall respiratory activity comparable to that upon chemical reduction by ascorbate. The dependence of O2 consumption on mediator and mitochondrial suspension concentrations shows that mass transport between the electrode and mitochondria does not limit biological activity of the latter. The mediated electrochemical approach is validated by the radiometric measurements of simulated changes in the intrinsic mitochondrial activity upon partial inhibition of complex IV by NaN3. This approach enables the development of O2-independent, biomimetic electrochemical assays narrowly targeting components of the electron transport chains in their native environments.
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Affiliation(s)
- Nathan L Frantz
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
| | - Gabrielle Brakoniecki
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
| | - Dawei Chen
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
| | - Denis A Proshlyakov
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
- Department of Physiology, Michigan State University, 567 Wilson Rd, East Lansing, Michigan 48824-6405, United States
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14
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Pille JA, Riess ML. Potential Effects of Poloxamer 188 on Rat Isolated Brain Mitochondria after Oxidative Stress In Vivo and In Vitro. Brain Sci 2021; 11:brainsci11010122. [PMID: 33477541 PMCID: PMC7831103 DOI: 10.3390/brainsci11010122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 01/11/2021] [Accepted: 01/13/2021] [Indexed: 12/26/2022] Open
Abstract
Outcome after cerebral ischemia is often dismal. Reperfusion adds significantly to the ischemic injury itself. Therefore, new strategies targeting ischemia/reperfusion (I/R) injury are critically needed. Poloxamer (P)188, an amphiphilic triblock copolymer, is a highly promising pharmacological therapeutic as its capability to insert into injured cell membranes has been reported to protect against I/R injury in various models. Although mitochondrial function particularly profits from P188 treatment after I/R, it remains unclear if this beneficial effect occurs directly or indirectly. Here, rat isolated brain mitochondria underwent oxidative stress in vivo by asphyxial cardiac arrest or in vitro by the addition of hydrogen peroxide (H2O2) after isolation. Mitochondrial function was assessed by adenosine triphosphate synthesis, oxygen consumption, and calcium retention capacity. Both asphyxia and H2O2 exposure significantly impaired mitochondrial function. P188 did not preserve mitochondrial function after either injury mechanism. Further research is indicated.
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Affiliation(s)
- Johannes A Pille
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN 37232, USA;
- Department of Anesthesiology, University Medicine Greifswald, 17475 Greifswald, Germany
| | - Matthias L Riess
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN 37232, USA;
- Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA
- Anesthesiology, TVHS VA Medical Center, Nashville, TN 37212, USA
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15
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Rottenberg H, Hoek JB. The Mitochondrial Permeability Transition: Nexus of Aging, Disease and Longevity. Cells 2021; 10:cells10010079. [PMID: 33418876 PMCID: PMC7825081 DOI: 10.3390/cells10010079] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 12/23/2020] [Accepted: 01/01/2021] [Indexed: 12/11/2022] Open
Abstract
The activity of the mitochondrial permeability transition pore, mPTP, a highly regulated multi-component mega-channel, is enhanced in aging and in aging-driven degenerative diseases. mPTP activity accelerates aging by releasing large amounts of cell-damaging reactive oxygen species, Ca2+ and NAD+. The various pathways that control the channel activity, directly or indirectly, can therefore either inhibit or accelerate aging or retard or enhance the progression of aging-driven degenerative diseases and determine lifespan and healthspan. Autophagy, a catabolic process that removes and digests damaged proteins and organelles, protects the cell against aging and disease. However, the protective effect of autophagy depends on mTORC2/SKG1 inhibition of mPTP. Autophagy is inhibited in aging cells. Mitophagy, a specialized form of autophagy, which retards aging by removing mitochondrial fragments with activated mPTP, is also inhibited in aging cells, and this inhibition leads to increased mPTP activation, which is a major contributor to neurodegenerative diseases, such as Alzheimer's and Parkinson's diseases. The increased activity of mPTP in aging turns autophagy/mitophagy into a destructive process leading to cell aging and death. Several drugs and lifestyle modifications that enhance healthspan and lifespan enhance autophagy and inhibit the activation of mPTP. Therefore, elucidating the intricate connections between pathways that activate and inhibit mPTP, in the context of aging and degenerative diseases, could enhance the discovery of new drugs and lifestyle modifications that slow aging and degenerative disease.
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Affiliation(s)
- Hagai Rottenberg
- New Hope Biomedical R&D, 23 W. Bridge street, New Hope, PA 18938, USA
- Correspondence: ; Tel.: +1-267-614-5588
| | - Jan B. Hoek
- MitoCare Center, Department of Anatomy, Pathology and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA;
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16
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Mitochondrial reactive oxygen species in physiology and disease. Cell Calcium 2021; 94:102344. [PMID: 33556741 DOI: 10.1016/j.ceca.2020.102344] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 12/23/2020] [Accepted: 12/23/2020] [Indexed: 12/13/2022]
Abstract
Mitochondrial reactive oxygen species (mROS) are routinely produced at several sites within the organelle. The balance in their formation and elimination is maintained by a complex and robust antioxidant system. mROS may act as second messengers and regulate a number of physiological processes, such as insulin signaling, cell differentiation and proliferation, wound healing, etc. Nevertheless, when a sudden or sustained increase in ROS formation is not efficiently neutralized by the endogenous antioxidant defense system, the detrimental impact of high mROS levels on cell function and viability eventually results in disease development. In this review, we will focus on the dual role of mROS in pathophysiology, emphasizing the physiological role exerted by a regulated mROS production/elimination, and discussing the detrimental effects evoked by an imbalance in mitochondrial redox state. Furthermore, we will touch upon the interplay between mROS and Ca2+ homeostasis.
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17
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Sarkar N, Das B, Bishayee A, Sinha D. Arsenal of Phytochemicals to Combat Against Arsenic-Induced Mitochondrial Stress and Cancer. Antioxid Redox Signal 2020; 33:1230-1256. [PMID: 31813247 DOI: 10.1089/ars.2019.7950] [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] [Indexed: 12/19/2022]
Abstract
Significance: Phytochemicals are important dietary constituents with antioxidant properties. They affect various signaling pathways involved in the overall maintenance of interior milieu of the cell. Arsenic, an environmental toxicant, is well known for its deleterious consequences, such as various diseases, including cancers in humans. Mitochondria are the cell's powerhouse that fuel all metabolic energy requirements. Dysfunctional mitochondria due to stressors may lead to abnormal functioning of the organelle, hampering the crucial cellular cross talks and ultimately leading to cancer. Application of phytochemicals against arsenic-induced mitochondrial disorders may be a preventive measure to counteract the ruinous impacts of the metalloid. Recent Advances: In recent years, extensive research on the role of mitochondria in cancer gives a better understanding of the areas the organelle covers in maintaining a healthy cell or in inducing carcinogenicity. Detailed knowledge of the mitochondrial governances would enable researchers to administer numerous phytochemicals to ameliorate altered oxidative phosphorylation, mitochondrial membrane potential (MMP), mitochondrial oxidative stress, unfolded protein response, glycolysis, or even apoptosis. Critical Issues: In this review, we have addressed how various phytochemicals belonging to diverse classes combat against arsenic-induced mitochondrial oxidative stress, depletion of MMP, cell cycle abrogation, apoptosis, glycolytic damages, oncogenic regulations, chaperones, mitochondrial complexes, and mitochondrial membrane pore formation in both in vitro and in vivo models. Future Directions: Insightful application of mitoprotective phytochemicals against arsenic-induced mitochondrial oxidative stress and carcinogenesis may guide researchers to develop preclinical chemopreventive agents to fight arsenic toxicity in humans.
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Affiliation(s)
- Nivedita Sarkar
- Receptor Biology and Tumor Metastasis, Chittaranjan National Cancer Institute, Kolkata, India
| | - Bornita Das
- Receptor Biology and Tumor Metastasis, Chittaranjan National Cancer Institute, Kolkata, India
| | - Anupam Bishayee
- Lake Erie College of Osteopathic Medicine, Bradenton, Florida, USA
| | - Dona Sinha
- Receptor Biology and Tumor Metastasis, Chittaranjan National Cancer Institute, Kolkata, India
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18
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Chen H, Li L, Lu Y, Shen Y, Zhang M, Ge L, Wang M, Yang J, Tian Z, Tang X. Azoxystrobin Reduces Oral Carcinogenesis by Suppressing Mitochondrial Complex III Activity and Inducing Apoptosis. Cancer Manag Res 2020; 12:11573-11583. [PMID: 33209061 PMCID: PMC7670090 DOI: 10.2147/cmar.s280285] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 10/28/2020] [Indexed: 12/28/2022] Open
Abstract
Purpose The five-year survival rate of patients with oral cancer is approximately 50%; thus, alternative drugs with higher efficacy are urgently required. Azoxystrobin (AZOX), a natural, novel methoxyacrylate fungicide isolated from mushrooms, has a broad-spectrum, with highly efficient bactericidal effect. However, studies on AZOX have focused on antifungal effects. Here, we explore the potential cancer-preventive effects of AZOX and the underlying mechanisms. Materials and Methods The effects of AZOX on oral carcinogenesis induced by 4-nitroquinoline-1-oxide (4NQO) were investigated in C57BL/6 mice. Cell proliferation and apoptosis were examined by Ki67 immunohistochemistry and TUNEL staining, respectively. The main organ coefficients of each group were calculated to evaluate the biosafety of AZOX. CCK8 and flow cytometry were used to detect the effects of AZOX on cell viability and apoptosis in oral cancer cell line CAL27 and SCC15 cells in vitro. Cell cycle, mitochondrial complex III activity, intercellular reactive oxygen species (ROS) level, mitochondrial ROS level, and mitochondrial membrane potential (MMP) were detected by flow cytometry in AZOX-treated CAL27 cells. Results AZOX significantly inhibited the occurrence of 4NQO-induced tongue cancer and delayed the progression of tongue precancerous lesions in mice. High-dose AZOX obviously inhibited cell viability and induced apoptosis in epithelial dysplastic and oral squamous cell carcinoma (OSCC) lesions in mouse tongue mucosa. AZOX was confirmed to have high biosafety. Similarly, in vitro cell viability was suppressed, and apoptosis was induced in AZOX-treated CAL27 and SCC15 cells. AZOX induced cell cycle arrest at the S phase. AZOX inhibited mitochondrial complex III activity, increased intracellular and mitochondrial ROS levels, and decreased MMP in CAL27 cells. Conclusion AZOX inhibited the development of oral cancer through specific inhibition of the activity of mitochondrial complex III, which led to ROS accumulation, and MMP decrease, ultimately inducing apoptosis. AZOX may be a novel agent for the prevention and treatment of OSCC.
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Affiliation(s)
- Hui Chen
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Lingyu Li
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Yunping Lu
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Yajun Shen
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Min Zhang
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Lihua Ge
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Min Wang
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Jing Yang
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Zhenchuan Tian
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Xiaofei Tang
- Division of Oral Pathology, Beijing Institute of Dental Research, Beijing Stomatological Hospital & School of Stomatology, Capital Medical University, Beijing, People's Republic of China
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19
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Markevich NI, Markevich LN, Hoek JB. Computational Modeling Analysis of Generation of Reactive Oxygen Species by Mitochondrial Assembled and Disintegrated Complex II. Front Physiol 2020; 11:557721. [PMID: 33178032 PMCID: PMC7596731 DOI: 10.3389/fphys.2020.557721] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 08/31/2020] [Indexed: 11/13/2022] Open
Abstract
Reactive oxygen species (ROS) function as critical mediators in a broad range of cellular signaling processes. The mitochondrial electron transport chain is one of the major contributors to ROS formation in most cells. Increasing evidence indicates that the respiratory Complex II (CII) can be the predominant ROS generator under certain conditions. A computational, mechanistic model of electron transfer and ROS formation in CII was developed in the present study to facilitate quantitative analysis of mitochondrial ROS production. The model was calibrated by fitting the computer simulated results to experimental data obtained on submitochondrial particles (SMP) prepared from bovine and rat heart mitochondria upon inhibition of the ubiquinone (Q)-binding site by atpenin A5 (AA5) and Complex III by myxothiazol, respectively. The model predicts that only reduced flavin adenine dinucleotide (FADH2) in the unoccupied dicarboxylate state and flavin semiquinone radical (FADH•) feature the experimentally observed bell-shaped dependence of the rate of ROS production on the succinate concentration upon inhibition of respiratory Complex III (CIII) or Q-binding site of CII, i.e., suppression of succinate-Q reductase (SQR) activity. The other redox centers of CII such as Fe-S clusters and Q-binding site have a hyperbolic dependence of ROS formation on the succinate concentration with very small maximal rate under any condition and cannot be considered as substantial ROS generators in CII. Computer simulation results show that CII disintegration (which results in dissociation of the hydrophilic SDHA/SDHB subunits from the inner membrane to the mitochondrial matrix) causes crucial changes in the kinetics of ROS production by CII that are qualitatively and quantitatively close to changes in the kinetics of ROS production by assembled CII upon inhibition of CIII or Q-binding site of CII. Thus, the main conclusions from the present computational modeling study are the following: (i) the impairment of the SQR activity of CII resulting from inhibition of CIII or Q-binding site of CII and (ii) CII disintegration causes a transition in the succinate-dependence of ROS production from a small-amplitude sigmoid (hyperbolic) shape, determined by Q-binding site or [3Fe-4S] cluster to a high-amplitude bell-shaped kinetics with a shift to small subsaturated concentrations of succinate, determined by the flavin site.
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Affiliation(s)
| | | | - Jan B Hoek
- MitoCare Center for Mitochondrial Research, Department of Pathology, Anatomy, and Cell Biology, Thomas Jefferson University, Philadelphia, PA, United States
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20
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Increased Succinate Accumulation Induces ROS Generation in In Vivo Ischemia/Reperfusion-Affected Rat Kidney Mitochondria. BIOMED RESEARCH INTERNATIONAL 2020; 2020:8855585. [PMID: 33102598 PMCID: PMC7578729 DOI: 10.1155/2020/8855585] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 09/30/2020] [Accepted: 10/03/2020] [Indexed: 01/13/2023]
Abstract
Mitochondria are recognized as main reactive oxygen species (ROS) producers, involving ROS generation by mitochondrial complexes I and III. Lately, the focus has been shifting to the ROS generation by complex II. Contribution of complex II (SDH) to ROS generation still remains debatable, especially in in vivo settings. Moreover, it is not completely defined at what time of ischemia the first alterations in mitochondria and the cell begin, which is especially important with renal arterial clamping in vivo during kidney surgery, as it predicts the postischemic kidney function. The aim of this study on an in vivo rat kidney ischemia/reperfusion model was to determine if there is a connection among (a) duration of kidney ischemia and mitochondrial dysfunction and (b) succinate dehydrogenase activity, succinate accumulation, and ROS generation in mitochondria at low and saturating succinate concentrations. Our results point out that (1) mitochondrial disturbances can occur even after 30 min of kidney ischemia/reperfusion in vivo and increase progressively with the prolonged time of ischemia; (2) accumulation of succinate in cytosol after ischemia/reperfusion correlated with increased H2O2 generation mediated by complex II, which was most noticeable with physiological succinate concentrations; and (3) ischemia/reperfusion induced cell necrosis, indicated by the changes in LDH activity. In conclusion, our new findings on the accumulation of succinate in cytosol and changes in SDH activity during kidney ischemia/reperfusion may be important for energy production after reperfusion, when complex I activity is suppressed. On the other hand, an increased activity of succinate dehydrogenase is associated with the increased ROS generation, especially with physiological succinate concentrations. All these observations play an important role in understanding the mechanisms which occur in the early phase of ischemia/reperfusion injury in vivo and may provide new ideas for novel therapeutic approaches or injury prevention; therefore, more detailed studies are necessary in the future.
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21
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Markevich NI, Galimova MH, Markevich LN. Hysteresis and bistability in the succinate-CoQ reductase activity and reactive oxygen species production in the mitochondrial respiratory complex II. Redox Biol 2020; 37:101630. [PMID: 32747163 PMCID: PMC7767736 DOI: 10.1016/j.redox.2020.101630] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/14/2020] [Accepted: 06/28/2020] [Indexed: 11/25/2022] Open
Abstract
The mitochondrial respiratory Complex II (CII) is one of key enzymes of cell energy metabolism, linking the tricarboxylic acid (TCA) cycle and the electron transport chain (ETC). CII reversibly oxidizes succinate to fumarate in the TCA cycle and transfers the electrons, produced by this reaction to the membrane quinone pool, providing ubiquinol QH2 to ETC. CII is also known as a generator of reactive oxygen species (ROS). It was shown experimentally that succinate can serve as not only a substrate in the forward succinate-quinone oxidoreductase (SQR) direction, but also an enzyme activator. Molecular and kinetic mechanisms of this property of CII are still unclear. In order to account for activation of CII by succinate in the forward SQR direction, we developed and analyzed a computational mechanistic model of electron transfer and ROS formation in CII. It was found that re-binding of succinate to the unoccupied dicarboxylate binding site when FAD is reduced with subsequent oxidation of FADH2 creates a positive feedback loop in the succinate oxidation. The model predicts that this positive feedback can result in hysteresis and bistable switches in SQR activity and ROS production in CII. This requires that the rate constant of re-binding of succinate has to be higher than the rate constant of the initial succinate binding to the active center when FAD is oxidized. Hysteresis and bistability in the SQR activity and ROS production in CII can play an important physiological role. In the presence of hysteresis with two stable branches with high and low SQR activity, high SQR activity is maintained even with a very strong drop in the succinate concentration, which may be necessary in the process of cell functioning in stressful situations. For the same reason, a high stationary rate of ROS production in CII can be maintained at low succinate concentrations. Computational model of electron flows in the respiratory Complex II was developed. The Complex II model predicts a positive feedback loop in the succinate oxidation. Complex II can operate as a bistable switch between two alternative stable states. ROS production in Complex II may have a hysteretic behaviour.
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Affiliation(s)
- Nikolay I Markevich
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow region, 142290, Russian Federation.
| | - Miliausha H Galimova
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow region, 142290, Russian Federation
| | - Lubov N Markevich
- Institute of Cell Biophysics of RAS, Pushchino, Moscow region, 142290, Russian Federation
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Boulghobra D, Coste F, Geny B, Reboul C. Exercise training protects the heart against ischemia-reperfusion injury: A central role for mitochondria? Free Radic Biol Med 2020; 152:395-410. [PMID: 32294509 DOI: 10.1016/j.freeradbiomed.2020.04.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 04/01/2020] [Accepted: 04/07/2020] [Indexed: 12/11/2022]
Abstract
Ischemic heart disease is one of the main causes of morbidity and mortality worldwide. Physical exercise is an effective lifestyle intervention to reduce the risk factors for cardiovascular disease and also to improve cardiac function and survival in patients with ischemic heart disease. Among the strategies that contribute to reduce heart damages during ischemia and reperfusion, regular physical exercise is efficient both in rodent experimental models and in humans. However, the cellular and molecular mechanisms of the cardioprotective effects of exercise remain unclear. During ischemia and reperfusion, mitochondria are crucial players in cell death, but also in cell survival. Although exercise training can influence mitochondrial function, the consequences on heart sensitivity to ischemic insults remain elusive. In this review, we describe the effects of physical activity on cardiac mitochondria and their potential key role in exercise-induced cardioprotection against ischemia-reperfusion damage. Based on recent scientific data, we discuss the role of different pathways that might help to explain why mitochondria are a key target of exercise-induced cardioprotection.
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Affiliation(s)
| | - Florence Coste
- LAPEC EA4278, Avignon Université, F-84000, Avignon, France
| | - Bernard Geny
- EA3072, «Mitochondrie, Stress Oxydant, et Protection Musculaire», Université de Strasbourg, 67000, Strasbourg, France
| | - Cyril Reboul
- LAPEC EA4278, Avignon Université, F-84000, Avignon, France.
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23
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Restoring Mitochondrial Function While Avoiding Redox Stress: The Key to Preventing Ischemia/Reperfusion Injury in Machine Perfused Liver Grafts? Int J Mol Sci 2020; 21:ijms21093132. [PMID: 32365506 PMCID: PMC7246795 DOI: 10.3390/ijms21093132] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 04/18/2020] [Accepted: 04/27/2020] [Indexed: 02/07/2023] Open
Abstract
Mitochondria sense changes resulting from the ischemia and subsequent reperfusion of an organ and mitochondrial reactive oxygen species (ROS) production initiates a series of events, which over time result in the development of full-fledged ischemia-reperfusion injury (IRI), severely affecting graft function and survival after transplantation. ROS activate the innate immune system, regulate cell death, impair mitochondrial and cellular performance and hence organ function. Arresting the development of IRI before the onset of ROS production is currently not feasible and clinicians are faced with limiting the consequences. Ex vivo machine perfusion has opened the possibility to ameliorate or antagonize the development of IRI and may be particularly beneficial for extended criteria donor organs. The molecular events occurring during machine perfusion remain incompletely understood. Accumulation of succinate and depletion of adenosine triphosphate (ATP) have been considered key mechanisms in the initiation; however, a plethora of molecular events contribute to the final tissue damage. Here we discuss how understanding mitochondrial dysfunction linked to IRI may help to develop novel strategies for the prevention of ROS-initiated damage in the evolving era of machine perfusion.
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24
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Liu Y, Pang Y, Zhu B, Uher O, Caisova V, Huynh TT, Taieb D, Hadrava Vanova K, Ghayee HK, Neuzil J, Levine M, Yang C, Pacak K. Therapeutic Targeting of SDHB-Mutated Pheochromocytoma/Paraganglioma with Pharmacologic Ascorbic Acid. Clin Cancer Res 2020; 26:3868-3880. [PMID: 32152203 DOI: 10.1158/1078-0432.ccr-19-2335] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 12/09/2019] [Accepted: 03/04/2020] [Indexed: 12/21/2022]
Abstract
PURPOSE Pheochromocytomas and paragangliomas (PCPG) are usually benign neuroendocrine tumors. However, PCPGs with mutations in the succinate dehydrogenase B subunit (SDHB) have a poor prognosis and frequently develop metastatic lesions. SDHB-mutated PCPGs exhibit dysregulation in oxygen metabolic pathways, including pseudohypoxia and formation of reactive oxygen species, suggesting that targeting the redox balance pathway could be a potential therapeutic approach. EXPERIMENTAL DESIGN We studied the genetic alterations of cluster I PCPGs compared with cluster II PCPGs, which usually present as benign tumors. By targeting the signature molecular pathway, we investigated the therapeutic effect of ascorbic acid on PCPGs using in vitro and in vivo models. RESULTS By investigating PCPG cells with low SDHB levels, we show that pseudohypoxia resulted in elevated expression of iron transport proteins, including transferrin (TF), transferrin receptor 2 (TFR2), and the divalent metal transporter 1 (SLC11A2; DMT1), leading to iron accumulation. This iron overload contributed to elevated oxidative stress. Ascorbic acid at pharmacologic concentrations disrupted redox homeostasis, inducing DNA oxidative damage and cell apoptosis in PCPG cells with low SDHB levels. Moreover, through a preclinical animal model with PCPG allografts, we demonstrated that pharmacologic ascorbic acid suppressed SDHB-low metastatic lesions and prolonged overall survival. CONCLUSIONS The data here demonstrate that targeting redox homeostasis as a cancer vulnerability with pharmacologic ascorbic acid is a promising therapeutic strategy for SDHB-mutated PCPGs.
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Affiliation(s)
- Yang Liu
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland
| | - Ying Pang
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland
| | - Boqun Zhu
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland.,Endoscopy Center and Endoscopy Research Institute, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Ondrej Uher
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland.,Department of Medical Biology, Faculty of Science, University of South Bohemia, Ceske Budejovice, Czech Republic
| | - Veronika Caisova
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland
| | - Thanh-Truc Huynh
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland
| | - David Taieb
- Department of Nuclear Medicine, La Timone University Hospital, CERIMED, Aix-Marseille University, Marseille, France
| | - Katerina Hadrava Vanova
- Molecular Therapy Group, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, Czech Republic
| | - Hans Kumar Ghayee
- Department of Internal Medicine, Division of Endocrinology, University of Florida College of Medicine and Malcom Randall VA Medical Center, Gainesville, Florida
| | - Jiri Neuzil
- Department of Medical Biology, Faculty of Science, University of South Bohemia, Ceske Budejovice, Czech Republic.,Mitochondria, Apoptosis and Cancer Research Group, School of Medical Science and Menzies Health Institute Queensland, Griffith University, Southport, Queensland, Australia
| | - Mark Levine
- Molecular and Clinical Nutrition Section, Intramural Research Program, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland
| | - Chunzhang Yang
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland.
| | - Karel Pacak
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland.
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25
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Andrabi SS, Parvez S, Tabassum H. Ischemic stroke and mitochondria: mechanisms and targets. PROTOPLASMA 2020; 257:335-343. [PMID: 31612315 DOI: 10.1007/s00709-019-01439-2] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 08/30/2019] [Indexed: 05/05/2023]
Abstract
Stroke is one of the main causes of mortality and disability in most countries of the world. The only way of managing patients with ischemic stroke is the use of intravenous tissue plasminogen activator and endovascular thrombectomy. However, very few patients receive these treatments as the therapeutic time window is narrow after an ischemic stroke. The paucity of stroke management approaches can only be addressed by identifying new possible therapeutic targets. Mitochondria have been a rare target in the clinical management of stroke. Previous studies have only investigated the bioenergetics and apoptotic roles of this organelle; however, the mitochondrion is now considered as a key organelle that participates in many cellular and molecular functions. This review discusses the mitochondrial mechanisms in cerebral ischemia such as its role in reactive oxygen species (ROS) generation, apoptosis, and electron transport chain dysfunction. Understanding the mechanisms of mitochondria in neural cell death during ischemic stroke might help to design new therapeutic targets for ischemic stroke as well as other neurological diseases.
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Affiliation(s)
- Syed Suhail Andrabi
- Cleveland Clinic Lerner Research Institute, Cleveland, OH, 44195, USA.
- Department of Medical Elementology and Toxicology, School of Chemical and Life Sciences, Jamia Hamdard, New Delhi, 110062, India.
| | - Suhel Parvez
- Department of Medical Elementology and Toxicology, School of Chemical and Life Sciences, Jamia Hamdard, New Delhi, 110062, India.
| | - Heena Tabassum
- Division of Biomedical Sciences, Indian Council of Medical Research, Ministry of Health and Family Welfare, Govt. of India, V. Ramalingaswamy Bhawan, P.O. Box No. 4911, New Delhi, 110029, India
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26
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Wang HW, Zhu SQ, Liu J, Miao CY, Zhang Y, Zhou BH. Fluoride-induced renal dysfunction via respiratory chain complex abnormal expression and fusion elevation in mice. CHEMOSPHERE 2020; 238:124607. [PMID: 31524603 DOI: 10.1016/j.chemosphere.2019.124607] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 08/15/2019] [Accepted: 08/16/2019] [Indexed: 06/10/2023]
Abstract
A fluoride exposure mouse model is established to evaluate the relationship between mitochondrial respiratory chain complexes and renal dysfunction. Morphological changes in kidney tissues were observed. Renal function and cell proliferation in the kidneys were evaluated. The expression of mitochondrial fusion protein including mitofusin-1 (Mfn1) and optic atrophy 1 (OPA1), and mitochondrial respiratory chain complex subunits, including NDUFV2, SDHA, CYC1 and COX Ⅳ, were detected via real-time polymerase chain reaction, immunohistochemistry staining and Western blot, respectively. Results showed that the structures of renal tubule, renal glomerulus and renal papilla were seriously damaged. Renal function was impaired, and cell proliferation was remarkably inhibited by excessive fluoride in kidney. The mRNA and protein expression levels of Mfn1, OPA1, NDUFV2, CYC1 and COX Ⅳ were significantly increased after excessive fluoride exposure. However, the mRNA and protein expression of SDHA significantly decreased. Overall, our findings revealed that excessive fluoride can damage kidney structure, inhibit renal cell proliferation, interfere with the expression of mitochondrial respiratory chain complexes and elevate mitochondrial fusion. Consequently, renal function disorder occurred.
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Affiliation(s)
- Hong-Wei Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Shi-Quan Zhu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Jing Liu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Cheng-Yi Miao
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Yan Zhang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Bian-Hua Zhou
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
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27
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Mikkola R, Andersson M, Kharechkina E, Kruglova S, Kruglov A. Fusaricidin-Type Compounds Create Pores in Mitochondrial and Plasma Membranes of Mammalian Cells. Biomolecules 2019; 9:biom9090433. [PMID: 31480526 PMCID: PMC6770722 DOI: 10.3390/biom9090433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Revised: 08/29/2019] [Accepted: 08/29/2019] [Indexed: 12/12/2022] Open
Abstract
Fusaricidins and related LI-F compounds are effective bactericides and fungicides. Recently, we have found that they are highly toxic to mammalian cells. Here, we studied the effect of fusaricidin-type compounds (FTCs) on the membranes of mammalian cells. Ethanol extracts from Paenibacillus polymyxa strains, RS10 and I/Sim, were fractionated and analyzed by HPLC and mass spectrometry. The effects of FTCs on mitochondrial functions and integrity were studied by standard methods: measurements of swelling, membrane potential (ΔΨm), respiration rate, cytochrome c release, and pore sizes. Superoxide flashes were registered by 3,7-dihydro-2-methyl-6-(4-methoxyphenyl)imidazol[1,2-a]pyrazine-3-one (MCLA). Plasma membrane permeability was assessed by propidium iodide (PI) staining and ATP release. FTCs caused the permeabilization of the inner mitochondria membrane (IMM) to ions and low-molecular-weight (~750 Da) solutes. The permeabilization did not depend on the permeability transition pore (mPTP) but was strongly dependent on ΔΨm. Fusaricidins A plus B, LI-F05a, and LI-F05b-LI-F07b permeabilized IMM with comparable efficiency. They created pores and affected mitochondrial functions and integrity similarly to mPTP opening. They permeabilized the sperm cell plasma membrane to ATP and PI. Thus, the formation of pores in polarized membranes underlays the toxicity of FTCs to mammals. Besides, FTCs appeared to be superior reference compounds for mPTP studies.
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Affiliation(s)
- Raimo Mikkola
- Department of Civil Engineering, School of Engineering, Aalto University, 00076 Aalto, Finland
| | - Maria Andersson
- Department of Civil Engineering, School of Engineering, Aalto University, 00076 Aalto, Finland
| | - Ekaterina Kharechkina
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, 142292 Moscow Region, Russia
| | - Svetlana Kruglova
- Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, 142292 Moscow Region, Russia
| | - Alexey Kruglov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, 142292 Moscow Region, Russia.
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28
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Stakišaitis D, Juknevičienė M, Damanskienė E, Valančiūtė A, Balnytė I, Alonso MM. The Importance of Gender-Related Anticancer Research on Mitochondrial Regulator Sodium Dichloroacetate in Preclinical Studies In Vivo. Cancers (Basel) 2019; 11:cancers11081210. [PMID: 31434295 PMCID: PMC6721567 DOI: 10.3390/cancers11081210] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 08/16/2019] [Accepted: 08/16/2019] [Indexed: 12/28/2022] Open
Abstract
Sodium dichloroacetate (DCA) is an investigational medicinal product which has a potential anticancer preparation as a metabolic regulator in cancer cells’ mitochondria. Inhibition of pyruvate dehydrogenase kinases by DCA keeps the pyruvate dehydrogenase complex in the active form, resulting in decreased lactic acid in the tumor microenvironment. This literature review displays the preclinical research data on DCA’s effects on the cell pyruvate dehydrogenase deficiency, pyruvate mitochondrial oxidative phosphorylation, reactive oxygen species generation, and the Na+–K+–2Cl− cotransporter expression regulation in relation to gender. It presents DCA pharmacokinetics and the hepatocarcinogenic effect, and the safety data covers the DCA monotherapy efficacy for various human cancer xenografts in vivo in male and female animals. Preclinical cancer researchers report the synergistic effects of DCA combined with different drugs on cancer by reversing resistance to chemotherapy and promoting cell apoptosis. Researchers note that female and male animals differ in the mechanisms of cancerogenesis but often ignore studying DCA’s effects in relation to gender. Preclinical gender-related differences in DCA pharmacology, pharmacological mechanisms, and the elucidation of treatment efficacy in gonad hormone dependency could be relevant for individualized therapy approaches so that gender-related differences in treatment response and safety can be proposed.
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Affiliation(s)
- Donatas Stakišaitis
- Laboratory of Molecular Oncology, National Cancer Institute, 08660 Vilnius, Lithuania.
- Department of Histology and Embryology, Medical Academy, Lithuanian University of Health Sciences, 44307 Kaunas, Lithuania.
| | - Milda Juknevičienė
- Department of Histology and Embryology, Medical Academy, Lithuanian University of Health Sciences, 44307 Kaunas, Lithuania
| | - Eligija Damanskienė
- Department of Histology and Embryology, Medical Academy, Lithuanian University of Health Sciences, 44307 Kaunas, Lithuania
| | - Angelija Valančiūtė
- Department of Histology and Embryology, Medical Academy, Lithuanian University of Health Sciences, 44307 Kaunas, Lithuania
| | - Ingrida Balnytė
- Department of Histology and Embryology, Medical Academy, Lithuanian University of Health Sciences, 44307 Kaunas, Lithuania
| | - Marta Maria Alonso
- Department of Pediatrics, Clínica Universidad de Navarra, University of Navarra, 55 Pamplona, Spain.
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29
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Sprick JD, Mallet RT, Przyklenk K, Rickards CA. Ischaemic and hypoxic conditioning: potential for protection of vital organs. Exp Physiol 2019; 104:278-294. [PMID: 30597638 DOI: 10.1113/ep087122] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 12/20/2018] [Indexed: 12/13/2022]
Abstract
NEW FINDINGS What is the topic of this review? Remote ischaemic preconditioning (RIPC) and hypoxic preconditioning as novel therapeutic approaches for cardiac and neuroprotection. What advances does it highlight? There is improved understanding of mechanisms and signalling pathways associated with ischaemic and hypoxic preconditioning, and potential pitfalls with application of these therapies to clinical trials have been identified. Novel adaptations of preconditioning paradigms have also been developed, including intermittent hypoxia training, RIPC training and RIPC-exercise, extending their utility to chronic settings. ABSTRACT Myocardial infarction and stroke remain leading causes of death worldwide, despite extensive resources directed towards developing effective treatments. In this Symposium Report we highlight the potential applications of intermittent ischaemic and hypoxic conditioning protocols to combat the deleterious consequences of heart and brain ischaemia. Insights into mechanisms underlying the protective effects of intermittent hypoxia training are discussed, including the activation of hypoxia-inducible factor-1 and Nrf2 transcription factors, synthesis of antioxidant and ATP-generating enzymes, and a shift in microglia from pro- to anti-inflammatory phenotypes. Although there is little argument regarding the efficacy of remote ischaemic preconditioning (RIPC) in pre-clinical models, this strategy has not consistently translated into the clinical arena. This lack of translation may be related to the patient populations targeted thus far, and the anaesthetic regimen used in two of the major RIPC clinical trials. Additionally, we do not fully understand the mechanism through which RIPC protects the vital organs, and co-morbidities (e.g. hypercholesterolemia, diabetes) may interfere with its efficacy. Finally, novel adaptations have been made to extend RIPC to more chronic settings. One adaptation is RIPC-exercise (RIPC-X), an innovative paradigm that applies cyclical RIPC to blood flow restriction exercise (BFRE). Recent findings suggest that this novel exercise modality attenuates the exaggerated haemodynamic responses that may limit the use of conventional BFRE in some clinical settings. Collectively, intermittent ischaemic and hypoxic conditioning paradigms remain an exciting frontier for the protection against ischaemic injuries.
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Affiliation(s)
- Justin D Sprick
- Division of Renal Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, GA, 30307, USA.,Department of Physiology & Anatomy, University of North Texas Health Science Center, Fort Worth, TX, 76107, USA
| | - Robert T Mallet
- Department of Physiology & Anatomy, University of North Texas Health Science Center, Fort Worth, TX, 76107, USA
| | - Karin Przyklenk
- Cardiovascular Research Institute, Wayne State University School of Medicine, Detroit, MI, 48201, USA.,Department of Physiology, Wayne State University School of Medicine, Detroit, MI, 48201, USA.,Department of Emergency Medicine, Wayne State University School of Medicine, Detroit, MI, 48201, USA
| | - Caroline A Rickards
- Department of Physiology & Anatomy, University of North Texas Health Science Center, Fort Worth, TX, 76107, USA
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30
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Belyaeva EA. Respiratory complex II in mitochondrial dysfunction-mediated cytotoxicity: Insight from cadmium. J Trace Elem Med Biol 2018; 50:80-92. [PMID: 30262321 DOI: 10.1016/j.jtemb.2018.06.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Revised: 05/23/2018] [Accepted: 06/13/2018] [Indexed: 02/05/2023]
Abstract
In the present work we studied action of several inhibitors of respiratory complex II (CII) of mitochondrial electron transport chain, namely malonate and thenoyltrifluoroacetone (TTFA) on Cd2+-induced toxicity and cell mortality, using two rat cell lines, pheochromocytoma PC12 and ascites hepatoma AS-30D and isolated rat liver mitochondria (RLM). It was shown that malonate, an endogenous competitive inhibitor of dicarboxylate-binding site of CII, restored in part RLM respiratory function disturbed by Cd2+. In particular, malonate increased both phosphorylating and maximally uncoupled respiration rates in KCl medium in the presence of CI substrates as well as palliated changes in basal and resting state respiration rates produced by the heavy metal on the mitochondria energized by CI or CII substrates. Notably, malonate enhanced Cd2+-induced swelling of the mitochondria energized by CI substrates in KCl and, in a much lesser extent and at higher [Cd2+], in sucrose media but did not influence on the Cd2+ effects in NaCl medium. Besides, malonate did not affect swelling in sucrose media of RLM energized by CIV substrates under using of Cd2+ or Ca2+ whereas it strongly increased the mitochondrial swelling produced by selenite. In addition, malonate produced some protection against Cd2+-promoted necrotic death of AS-30D and PC12 cells and reduced intracellular reactive oxygen species (ROS) formation evoked by Cd2+ in PC12 cells. Importantly, TTFA, an irreversible competitive inhibitor of Q-binding site of CII, per se induced apoptosis of AS-30D cells which was inhibited by co-treatment with Cd2+ as well as decreased the Cd2+-enhanced intracellular ROS formation. In turn, decylubiquinone (dUb) at low μM concentrations did not protect AS-30D cells against the Cd2+-induced necrosis and enhanced the Cd2+-induced apoptosis of the cells. High μM concentrations of dUb were highly toxic for the cells. As consequence, the findings give new evidence indicative of critical involvement of CII in mechanism(s) of Cd2+-produced cytotoxicity and support the notion on CII as a perspective pharmacological target in mitochondria dysfunction-mediated conditions and diseases.
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Affiliation(s)
- Elena A Belyaeva
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Thorez pr. 44, 194223, St.-Petersburg, Russia.
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31
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Kharechkina ES, Nikiforova AB, Kruglov AG. Pyridine nucleotides regulate the superoxide anion flash upon permeabilization of mitochondrial membranes: An MCLA-based study. Free Radic Biol Med 2018; 124:473-483. [PMID: 29966697 DOI: 10.1016/j.freeradbiomed.2018.06.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 05/25/2018] [Accepted: 06/28/2018] [Indexed: 12/11/2022]
Abstract
The permeabilization of mitochondrial membranes via permeability transition pore opening or by the pore-forming peptide alamethicin causes a flash of superoxide anion (SA) and hydrogen peroxide production and the inhibition of matrix aconitase. It was shown using the SA probe 3,7-dihydro-2-methyl-6-(4-methoxyphenyl)imidazol[1,2-a]pyrazine-3-one (MCLA) that the substrates of NAD-dependent dehydrogenases, inhibitors of the respiratory chain, and NAD(P)H at millimolar concentrations suppressed or delayed SA flashes. In the presence of added NADH and NADPH, SA flashes were observed only after considerable oxidation of pyridine nucleotides. The production of SA was maximal at NADPH and NADH redox potentials from -315 to -295 mV and from -325 to -270 mV, respectively, depending on NAD(P)H concentration. SA generation supported by NADPH was severalfold greater than that supported by NADH. In intact mitochondria, NADPH- and NADH-dependent SA generation was negligible. Respiratory substrates at physiological or lower concentrations were incapable of suppressing the NADPH-supported SA flash. These data indicate that, in conditions close to pathophysiological, matrix NADPH oxidoreductase(s), presumably, an adrenodoxin reductase in complex with adrenodoxin, can essentially contribute to SA flashes associated with transient or irreversible permeability transition pore opening or membrane permeabilization by another mechanism.
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Affiliation(s)
- Ekaterina S Kharechkina
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region 142290, Russia
| | - Anna B Nikiforova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region 142290, Russia
| | - Alexey G Kruglov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region 142290, Russia.
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32
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Wu S, Lei L, Song Y, Liu M, Lu S, Lou D, Shi Y, Wang Z, He D. Mutation of hop-1 and pink-1 attenuates vulnerability of neurotoxicity in C. elegans: the role of mitochondria-associated membrane proteins in Parkinsonism. Exp Neurol 2018; 309:67-78. [PMID: 30076829 DOI: 10.1016/j.expneurol.2018.07.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 07/04/2018] [Accepted: 07/31/2018] [Indexed: 12/22/2022]
Abstract
Mitochondrial dysfunction is considered as a critical mechanism in the pathogenesis of Parkinson's disease (PD). Increasing evidence supports the notion of mitochondria-associated membranes (MAMs) in mitochondrial dysfunction; yet little is known about the role of MAMs-related proteins in the pathogenesis of PD. Herein we exposed the nematode Caenorhabditis elegans to 0.5-10.0 μM rotenone (RO) or 0.2-1.6 mM paraquat (PQ) for 3 days. Our results showed that both RO and PQ induced similar Parkinsonism including motor deficits and dopaminergic degeneration. RO/PQ caused mitochondrial damages characterized by the increase of vacuole areas and autophagy vesicles, but the decrease of mitochondrial cristae. RO/PQ-impacted mitochondrial function was also demonstrated by the decrease of ATP level and mitochondrial membrane potential. Additionally, the attachment or surrounding of endoplasmic reticulum to the damaged mitochondria indicates ultrastructural alterations in MAMs. Using fluorescently labeled transgenic nematodes, we further found that the expression of tomm-7 and genes of Complex I, II and III was reduced, whereas the expression of pink-1 was increased in the exposed animals. To determine MAMs in toxicity toward PD, we investigated the mutants of hop-1 and pink-1, encoding presenilin and PTEN-induced putative kinase 1 (PINK1) in mitochondria-associated membranes, respectively. Results demonstrated that the mutation of both hop-1 and pink-1 reduced the vulnerability of lethal, behavioral, and mitochondrial toxicity induced by RO/PQ. These findings suggest that presenilin and PINK1 play important roles in the RO/PQ-induced neurotoxicity through the mechanisms involved in mitochondria-associated membranes.
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Affiliation(s)
- Siyu Wu
- Laboratory of Toxicology, School of Ecological and Environmental Sciences, East China Normal University, 500# DongChuan RD, Shanghai 200241, China
| | - Lili Lei
- Laboratory of Toxicology, School of Ecological and Environmental Sciences, East China Normal University, 500# DongChuan RD, Shanghai 200241, China
| | - Yang Song
- Laboratory of Toxicology, School of Ecological and Environmental Sciences, East China Normal University, 500# DongChuan RD, Shanghai 200241, China
| | - Mengting Liu
- Laboratory of Toxicology, School of Ecological and Environmental Sciences, East China Normal University, 500# DongChuan RD, Shanghai 200241, China
| | - Shibo Lu
- Laboratory of Toxicology, School of Ecological and Environmental Sciences, East China Normal University, 500# DongChuan RD, Shanghai 200241, China
| | - Dan Lou
- Department of Environmental Health & Engineering, Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe St., Baltimore 21205, USA
| | - Yonghong Shi
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 518# Ziyue RD, Shanghai 200241, China
| | - Zhibin Wang
- Department of Environmental Health & Engineering, Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe St., Baltimore 21205, USA.
| | - Defu He
- Laboratory of Toxicology, School of Ecological and Environmental Sciences, East China Normal University, 500# DongChuan RD, Shanghai 200241, China; Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, East China Normal University, Shanghai 200241, China.
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33
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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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34
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Kang JW, Choi HS, Lee SM. Resolvin D1 attenuates liver ischaemia/reperfusion injury through modulating thioredoxin 2-mediated mitochondrial quality control. Br J Pharmacol 2018; 175:2441-2453. [PMID: 29569721 DOI: 10.1111/bph.14212] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 01/19/2018] [Accepted: 03/06/2018] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND AND PURPOSE Liver ischaemia and reperfusion (IR) injury is a sterile inflammatory response involving production of ROS. Mitochondrial homeostasis is maintained by mitochondrial quality control (QC). Thioredoxin (TRX) 2 is a key mitochondrial redox-sensitive protein. Resolvin D1 (RvD1), a specialized pro-resolving lipid mediator, exerts anti-inflammatory and antioxidant activities. We investigated mechanisms of RvD1 protection against IR-induced oxidative damage to the liver, focusing on TRX2-mediated mitochondrial QC. EXPERIMENTAL APPROACH Mice underwent partial warm IR. RvD1 was administered 1 h before ischaemia and immediately prior to reperfusion. Human liver carcinoma HepG2 cells were exposed to hypoxia/reoxygenation and transfected with TRX2 siRNA. Immunohistochemistry, Western blotting and enzyme assays were used to follow changes in mitochondrial structure and function. KEY RESULTS RvD1 attenuated hepatocellular damage following IR, assessed by serum aminotransferase activities and histology. RvD1 reduced mitochondrial swelling, lipid peroxidation and glutamate dehydrogenase release. Impaired activities of mitochondrial complexes I and III were restored by RvD1. RvD1 enhanced expression of the mitophagy-related protein, Parkin and inhibited accumulation of PTEN-induced putative kinase 1. RvD1 restored levels of mitochondrial biogenesis proteins including PPARγ coactivator 1α, nuclear respiratory factor 1 and mitochondrial transcription factor A and mtDNA level. RvD1 attenuated the increase in levels of the mitochondrial fission-related protein, dynamin-related protein 1. IR reduced TRX2 levels while increasing TRX2 association with TRX-interacting protein. RvD1 attenuated these changes. The regulatory effects of RvD1 on mitochondrial QC were abolished by TRX2 knockdown. CONCLUSIONS AND IMPLICATIONS We suggest that RvD1 ameliorated IR-induced hepatocellular damage by regulating TRX2-mediated mitochondrial QC.
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Affiliation(s)
- Jung-Woo Kang
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Republic of Korea
| | - Hyo-Sun Choi
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Republic of Korea
| | - Sun-Mee Lee
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Republic of Korea
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Berry BJ, Trewin AJ, Amitrano AM, Kim M, Wojtovich AP. Use the Protonmotive Force: Mitochondrial Uncoupling and Reactive Oxygen Species. J Mol Biol 2018; 430:3873-3891. [PMID: 29626541 DOI: 10.1016/j.jmb.2018.03.025] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/21/2018] [Accepted: 03/26/2018] [Indexed: 02/06/2023]
Abstract
Mitochondrial respiration results in an electrochemical proton gradient, or protonmotive force (pmf), across the mitochondrial inner membrane. The pmf is a form of potential energy consisting of charge (∆ψm) and chemical (∆pH) components, that together drive ATP production. In a process called uncoupling, proton leak into the mitochondrial matrix independent of ATP production dissipates the pmf and energy is lost as heat. Other events can directly dissipate the pmf independent of ATP production as well, such as chemical exposure or mechanisms involving regulated mitochondrial membrane electrolyte transport. Uncoupling has defined roles in metabolic plasticity and can be linked through signal transduction to physiologic events. In the latter case, the pmf impacts mitochondrial reactive oxygen species (ROS) production. Although capable of molecular damage, ROS also have signaling properties that depend on the timing, location, and quantity of their production. In this review, we provide a general overview of mitochondrial ROS production, mechanisms of uncoupling, and how these work in tandem to affect physiology and pathologies, including obesity, cardiovascular disease, and immunity. Overall, we highlight that isolated bioenergetic models-mitochondria and cells-only partially recapitulate the complex link between the pmf and ROS signaling that occurs in vivo.
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Affiliation(s)
- Brandon J Berry
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Box 711/604, 575 Elmwood Ave., Rochester, NY 14642, USA.
| | - Adam J Trewin
- Department of Anesthesiology and Perioperative Medicine, University of Rochester Medical Center, Box 711/604, 575 Elmwood Ave., Rochester, NY 14642, USA.
| | - Andrea M Amitrano
- Department of Pathology, University of Rochester Medical Center, Box 609, 601 Elmwood Ave., Rochester, NY 14642, USA; Department of Microbiology and Immunology, University of Rochester Medical Center, Box 609, 601 Elmwood Ave., Rochester, NY 14642, USA.
| | - Minsoo Kim
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Box 711/604, 575 Elmwood Ave., Rochester, NY 14642, USA; Department of Pathology, University of Rochester Medical Center, Box 609, 601 Elmwood Ave., Rochester, NY 14642, USA; Department of Microbiology and Immunology, University of Rochester Medical Center, Box 609, 601 Elmwood Ave., Rochester, NY 14642, USA.
| | - Andrew P Wojtovich
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Box 711/604, 575 Elmwood Ave., Rochester, NY 14642, USA; Department of Anesthesiology and Perioperative Medicine, University of Rochester Medical Center, Box 711/604, 575 Elmwood Ave., Rochester, NY 14642, USA.
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Cadenas S. ROS and redox signaling in myocardial ischemia-reperfusion injury and cardioprotection. Free Radic Biol Med 2018; 117:76-89. [PMID: 29373843 DOI: 10.1016/j.freeradbiomed.2018.01.024] [Citation(s) in RCA: 511] [Impact Index Per Article: 85.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/19/2018] [Accepted: 01/21/2018] [Indexed: 02/06/2023]
Abstract
Ischemia-reperfusion (IR) injury is central to the pathology of major cardiovascular diseases, such as stroke and myocardial infarction. IR injury is mediated by several factors including the elevated production of reactive oxygen species (ROS), which occurs particularly at reperfusion. The mitochondrial respiratory chain and NADPH oxidases of the NOX family are major sources of ROS in cardiomyocytes. The first part of this review discusses recent findings and controversies on the mechanisms of superoxide production by the mitochondrial electron transport chain during IR injury, as well as the contribution of the NOX isoforms expressed in cardiomyocytes, NOX1, NOX2 and NOX4, to this damage. It then focuses on the effects of ROS on the opening of the mitochondrial permeability transition pore (mPTP), an inner membrane non-selective pore that causes irreversible damage to the heart. The second part analyzes the redox mechanisms of cardiomyocyte mitochondrial protection; specifically, the activation of the hypoxia-inducible factor (HIF) pathway and the antioxidant transcription factor Nrf2, which are both regulated by the cellular redox state. Redox mechanisms involved in ischemic preconditioning, one of the most effective ways of protecting the heart against IR injury, are also reviewed. Interestingly, several of these protective pathways converge on the inhibition of mPTP opening during reperfusion. Finally, the clinical and translational implications of these cardioprotective mechanisms are discussed.
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Affiliation(s)
- Susana Cadenas
- Centro de Biología Molecular "Severo Ochoa" (CSIC-UAM) and Departamento de Biología Molecular, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain; Instituto de Investigación Sanitaria Princesa (IIS-IP), 28006 Madrid, Spain.
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Fujii S, Muraoka S, Miyamoto A, Sakurai K. [Linezolid-induced Apoptosis through Mitochondrial Damage and Role of Superoxide Dismutase-1 in Human Monocytic Cell Line U937]. YAKUGAKU ZASSHI 2018; 138:73-81. [PMID: 29311467 DOI: 10.1248/yakushi.17-00133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cytopenia is a major adverse event associated with linezolid therapy. The objective of this study was to examine whether the cytotoxicity of linezolid to eukaryotic cells was associated with mitochondrial dysfunction and apoptosis-like cell death in human leukemic monocyte lymphoma cell line U937. Apoptosis-like cell death was clearly observed when cells were incubated with linezolid, depending on the duration and linezolid concentration. Mitochondrial membrane potential of cells treated with linezolid collapsed in a short period of time, but the number of mitochondria did not decrease. Cytotoxicity of linezolid was relieved by the knockdown of superoxide dismutase-1 in U937 cells. On the other hand, no autophagy was observed in cells treated with linezolid. These results suggest that mitochondrial damages would be linked to the induction of apoptosis in U937 cells treated with linezolid and that its mechanism does not involve autophagy.
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Affiliation(s)
- Satoshi Fujii
- Department of Hospital Pharmacy, Sapporo Medical University Hospital.,Department of Life Science, Hokkaido Pharmaceutical University School of Pharmacy
| | - Sanae Muraoka
- Department of Life Science, Hokkaido Pharmaceutical University School of Pharmacy
| | - Atsushi Miyamoto
- Department of Hospital Pharmacy, Sapporo Medical University Hospital
| | - Koichi Sakurai
- Department of Life Science, Hokkaido Pharmaceutical University School of Pharmacy
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Xu Z, Kong D, He X, Guo L, Ge X, Liu X, Zhang H, Li J, Yang Y, Liu Z. Mitochondria-targeted half-sandwich rutheniumII diimine complexes: anticancer and antimetastasis via ROS-mediated signalling. Inorg Chem Front 2018. [DOI: 10.1039/c8qi00476e] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two half-sandwich RuII diimine complexes combine features of bioimaging, anticancer and antimetastasis properties into one molecule. The complexes target mitochondria and damage mitochondrial integrity.
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Metformin attenuates ER stress-induced mitochondrial dysfunction. Transl Res 2017; 190:40-50. [PMID: 29040818 PMCID: PMC5705457 DOI: 10.1016/j.trsl.2017.09.003] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 08/30/2017] [Accepted: 09/20/2017] [Indexed: 11/23/2022]
Abstract
Endoplasmic reticulum (ER) stress, a disturbance of the ER function, contributes to cardiac injury. ER and mitochondria are closely connected organelles within cells. ER stress contributes to mitochondrial dysfunction, which is a key factor to increase cardiac injury. Metformin, a traditional anti-diabetic drug, decreases cardiac injury during ischemia-reperfusion. Metformin also inhibits ER stress in cultured cells. We hypothesized that metformin can attenuate the ER stress-induced mitochondrial dysfunction and subsequent cardiac injury. Thapsigargin (THAP, 3 mg/kg) was used to induce ER stress in C57BL/6 mice. Cell injury and mitochondrial function were evaluated in the mouse heart 48 hours after 1-time THAP treatment. Metformin was dissolved in drinking water (0.5 g/250 ml) and fed to mice for 7 days before THAP injection. Metformin feeding continued after THAP treatment. THAP treatment increased apoptosis in mouse myocardium compared to control. THAP also led to decreased oxidative phosphorylation in heart mitochondria-oxidizing complex I substrates. THAP decreased the calcium retention capacity, indicating that ER stress sensitizes mitochondria to mitochondrial permeability transition pore opening. The cytosolic C/EBP homologous protein (CHOP) content was markedly increased in THAP-treated hearts compared to control, particularly in the nucleus. Metformin prevented the THAP-induced mitochondrial dysfunction and reduced CHOP content in cytosol and nucleus. Thus, metformin reduces cardiac injury during ER stress through the protection of cardiac mitochondria and attenuation of CHOP expression.
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Andrienko TN, Pasdois P, Pereira GC, Ovens MJ, Halestrap AP. The role of succinate and ROS in reperfusion injury - A critical appraisal. J Mol Cell Cardiol 2017; 110:1-14. [PMID: 28689004 PMCID: PMC5678286 DOI: 10.1016/j.yjmcc.2017.06.016] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 06/14/2017] [Accepted: 06/30/2017] [Indexed: 12/20/2022]
Abstract
We critically assess the proposal that succinate-fuelled reverse electron flow (REF) drives mitochondrial matrix superoxide production from Complex I early in reperfusion, thus acting as a key mediator of ischemia/reperfusion (IR) injury. Real-time surface fluorescence measurements of NAD(P)H and flavoprotein redox state suggest that conditions are unfavourable for REF during early reperfusion. Furthermore, rapid loss of succinate accumulated during ischemia can be explained by its efflux rather than oxidation. Moreover, succinate accumulation during ischemia is not attenuated by ischemic preconditioning (IP) despite powerful cardioprotection. In addition, measurement of intracellular reactive oxygen species (ROS) during reperfusion using surface fluorescence and mitochondrial aconitase activity detected major increases in ROS only after mitochondrial permeability transition pore (mPTP) opening was first detected. We conclude that mPTP opening is probably triggered initially by factors other than ROS, including increased mitochondrial [Ca2+]. However, IP only attenuates [Ca2+] increases later in reperfusion, again after initial mPTP opening, implying that IP regulates mPTP opening through additional mechanisms. One such is mitochondria-bound hexokinase 2 (HK2) which dissociates from mitochondria during ischemia in control hearts but not those subject to IP. Indeed, there is a strong correlation between the extent of HK2 loss from mitochondria during ischemia and infarct size on subsequent reperfusion. Mechanisms linking HK2 dissociation to mPTP sensitisation remain to be fully established but several related processes have been implicated including VDAC1 oligomerisation, the stability of contact sites between the inner and outer membranes, cristae morphology, Bcl-2 family members and mitochondrial fission proteins such as Drp1.
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Affiliation(s)
- Tatyana N Andrienko
- School of Biochemistry and The Bristol Heart Institute, Medical Sciences Building, University of Bristol, Bristol BS8 1TD, UK
| | - Philippe Pasdois
- School of Biochemistry and The Bristol Heart Institute, Medical Sciences Building, University of Bristol, Bristol BS8 1TD, UK
| | - Gonçalo C Pereira
- School of Biochemistry and The Bristol Heart Institute, Medical Sciences Building, University of Bristol, Bristol BS8 1TD, UK
| | - Matthew J Ovens
- School of Biochemistry and The Bristol Heart Institute, Medical Sciences Building, University of Bristol, Bristol BS8 1TD, UK
| | - Andrew P Halestrap
- School of Biochemistry and The Bristol Heart Institute, Medical Sciences Building, University of Bristol, Bristol BS8 1TD, UK.
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Korge P, Calmettes G, John SA, Weiss JN. Reactive oxygen species production induced by pore opening in cardiac mitochondria: The role of complex III. J Biol Chem 2017; 292:9882-9895. [PMID: 28450391 DOI: 10.1074/jbc.m116.768317] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 04/14/2017] [Indexed: 01/02/2023] Open
Abstract
Recent evidence has implicated succinate-driven reverse electron transport (RET) through complex I as a major source of damaging reactive oxygen species (ROS) underlying reperfusion injury after prolonged cardiac ischemia. However, this explanation may be incomplete, because RET on reperfusion is self-limiting and therefore transient. RET can only generate ROS when mitochondria are well polarized, and it ceases when permeability transition pores (PTP) open during reperfusion. Because prolonged ischemia/reperfusion also damages electron transport complexes, we investigated whether such damage could lead to ROS production after PTP opening has occurred. Using isolated cardiac mitochondria, we demonstrate a novel mechanism by which antimycin-inhibited complex III generates significant amounts of ROS in the presence of Mg2+ and NAD+ and the absence of exogenous substrates upon inner membrane pore formation by alamethicin or Ca2+-induced PTP opening. We show that H2O2 production under these conditions is related to Mg2+-dependent NADH generation by malic enzyme. H2O2 production is blocked by stigmatellin, indicating its origin from complex III, and by piericidin, demonstrating the importance of NADH-related ubiquinone reduction for ROS production under these conditions. For maximal ROS production, the rate of NADH generation has to be equal or below that of NADH oxidation, as further increases in [NADH] elevate ubiquinol-related complex III reduction beyond the optimal range for ROS generation. These results suggest that if complex III is damaged during ischemia, PTP opening may result in succinate/malate-fueled ROS production from complex III due to activation of malic enzyme by increases in matrix [Mg2+], [NAD+], and [ADP].
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Affiliation(s)
- Paavo Korge
- From the UCLA Cardiovascular Research Laboratory and the Departments of Medicine (Cardiology) and Physiology, David Geffen School of Medicine at UCLA, Los Angeles, California 90095
| | - Guillaume Calmettes
- From the UCLA Cardiovascular Research Laboratory and the Departments of Medicine (Cardiology) and Physiology, David Geffen School of Medicine at UCLA, Los Angeles, California 90095
| | - Scott A John
- From the UCLA Cardiovascular Research Laboratory and the Departments of Medicine (Cardiology) and Physiology, David Geffen School of Medicine at UCLA, Los Angeles, California 90095
| | - James N Weiss
- From the UCLA Cardiovascular Research Laboratory and the Departments of Medicine (Cardiology) and Physiology, David Geffen School of Medicine at UCLA, Los Angeles, California 90095
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