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van Hameren G, Muradov J, Minarik A, Aboghazleh R, Orr S, Cort S, Andrews K, McKenna C, Pham NT, MacLean MA, Friedman A. Mitochondrial dysfunction underlies impaired neurovascular coupling following traumatic brain injury. Neurobiol Dis 2023; 186:106269. [PMID: 37619791 DOI: 10.1016/j.nbd.2023.106269] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/21/2023] [Accepted: 08/22/2023] [Indexed: 08/26/2023] Open
Abstract
Traumatic brain injury (TBI) involves an acute injury (primary damage), which may evolve in the hours to days after impact (secondary damage). Seizures and cortical spreading depolarization (CSD) are metabolically demanding processes that may worsen secondary brain injury. Metabolic stress has been associated with mitochondrial dysfunction, including impaired calcium homeostasis, reduced ATP production, and elevated ROS production. However, the association between mitochondrial impairment and vascular function after TBI is poorly understood. Here, we explored this association using a rodent closed head injury model. CSD is associated with neurobehavioral decline after TBI. Craniotomy was performed to elicit CSD via electrical stimulation or to induce seizures via 4-aminopyridine application. We measured vascular dysfunction following CSDs and seizures in TBI animals using laser doppler flowmetry. We observed a more profound reduction in local cortical blood flow in TBI animals compared to healthy controls. CSD resulted in mitochondrial dysfunction and pathological signs of increased oxidative stress adjacent to the vasculature. We explored these findings further using electron microscopy and found that TBI and CSDs resulted in vascular morphological changes and mitochondrial cristae damage in astrocytes, pericytes and endothelial cells. Overall, we provide evidence that CSDs induce mitochondrial dysfunction, impaired cortical blood flow, and neurobehavioral deficits in the setting of TBI.
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Affiliation(s)
- Gerben van Hameren
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada.
| | - Jamil Muradov
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada
| | - Anna Minarik
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada
| | - Refat Aboghazleh
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada; Department of Basic Medical Sciences, Faculty of Medicine, Al-Balqa Applied University, Al-Salt, Jordan
| | - Sophie Orr
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada
| | - Shayna Cort
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada
| | - Keiran Andrews
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada
| | - Caitlin McKenna
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada
| | - Nga Thy Pham
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada
| | - Mark A MacLean
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada; Division of Neurosurgery, Department of Surgery, Dalhousie University, NS B3H 3A7, Halifax, Canada
| | - Alon Friedman
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Center, Dalhousie University, NS B3H 4H7, Halifax, Canada; Departments of Physiology and Cell Biology, Cognitive and Brain Sciences, Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
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Chow HM, Shi M, Cheng A, Gao Y, Chen G, Song X, So RWL, Zhang J, Herrup K. Age-related hyperinsulinemia leads to insulin resistance in neurons and cell-cycle-induced senescence. Nat Neurosci 2019; 22:1806-1819. [DOI: 10.1038/s41593-019-0505-1] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 08/21/2019] [Indexed: 01/17/2023]
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Reichart G, Mayer J, Zehm C, Kirschstein T, Tokay T, Lange F, Baltrusch S, Tiedge M, Fuellen G, Ibrahim S, Köhling R. Mitochondrial complex IV mutation increases reactive oxygen species production and reduces lifespan in aged mice. Acta Physiol (Oxf) 2019; 225:e13214. [PMID: 30376218 DOI: 10.1111/apha.13214] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 10/18/2018] [Accepted: 10/24/2018] [Indexed: 12/17/2022]
Abstract
AIM Mitochondrial DNA (mtDNA) mutations can negatively influence lifespan and organ function. More than 250 pathogenic mtDNA mutations are known, often involving neurological symptoms. Major neurodegenerative diseases share key etiopathogenetic components ie mtDNA mutations, mitochondrial dysfunction and oxidative stress. METHODS Here, we characterized a conplastic mouse strain (C57BL/6 J-mtNOD) carrying an electron transport chain complex IV mutation that leads to an altered cytochrome c oxidase subunit III. Since this mouse also harbours adenine insertions in the mitochondrial tRNA for arginine, we chose the C57BL/6 J-mtMRL as control strain which also carries a heteroplasmic stretch of adenine repetitions in this tRNA isoform. RESULTS Using MitoSOX fluorescence, we observed an elevated mitochondrial superoxide production and a reduced gene expression of superoxide dismutase 2 in the 24-month-old mtNOD mouse as compared to control. Together with the decreased expression of the fission-relevant gene Fis1, these data confirmed that the ageing mtNOD mouse had a mitochondrial dysfunctional phenotype. On the functional level, we could not detect significant differences in synaptic long-term potentiation, but found a markedly poor physical constitution to perform the Morris water maze task at the age of 24 months. Moreover, the median lifespan of mtNOD mice was significantly shorter than of control animals. CONCLUSION Our findings demonstrate that a complex IV mutation leads to mitochondrial dysfunction that translates into survival.
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Affiliation(s)
- Gesine Reichart
- Oscar Langendorff Institute of Physiology Rostock University Medical Center Rostock Germany
| | - Johannes Mayer
- Oscar Langendorff Institute of Physiology Rostock University Medical Center Rostock Germany
| | - Cindy Zehm
- Institute of Medical Biochemistry and Molecular Biology Rostock University Medical Center Rostock Germany
| | - Timo Kirschstein
- Oscar Langendorff Institute of Physiology Rostock University Medical Center Rostock Germany
| | - Tursonjan Tokay
- Oscar Langendorff Institute of Physiology Rostock University Medical Center Rostock Germany
- Center for Life Sciences Nazarbayev University Astana Kazakhstan
| | - Falko Lange
- Oscar Langendorff Institute of Physiology Rostock University Medical Center Rostock Germany
| | - Simone Baltrusch
- Institute of Medical Biochemistry and Molecular Biology Rostock University Medical Center Rostock Germany
| | - Markus Tiedge
- Institute of Medical Biochemistry and Molecular Biology Rostock University Medical Center Rostock Germany
| | - Georg Fuellen
- Institute for Biostatistics and Informatics in Medicine and Ageing Research Rostock Germany
- Interdisciplinary Faculty University of Rostock Rostock Germany
| | - Saleh Ibrahim
- Department of Dermatology Lübeck University Medical Center Lübeck Germany
| | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology Rostock University Medical Center Rostock Germany
- Interdisciplinary Faculty University of Rostock Rostock Germany
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Kretzschmar C, Roolf C, Timmer K, Sekora A, Knübel G, Murua Escobar H, Fuellen G, Ibrahim SM, Tiedge M, Baltrusch S, Jaster R, Köhling R, Junghanss C. Polymorphisms of the murine mitochondrial ND4, CYTB and COX3 genes impact hematopoiesis during aging. Oncotarget 2018; 7:74460-74472. [PMID: 27626489 PMCID: PMC5342679 DOI: 10.18632/oncotarget.11952] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 09/02/2016] [Indexed: 12/16/2022] Open
Abstract
During aging, mitochondrial DNA (mtDNA) can accumulate mutations leading to increasing levels of reactive oxygen species (ROS). Increased ROS were described to activate formerly quiescent hematopoietic stem cells (HSC). Mutations in mtDNA were shown to enhance the risk for myelodysplastic syndrome and leukemia. However, the complex relationship between mtDNA variations, ROS and aging of the hematopoietic system is not fully understood. Herein, three mouse strains with mtDNA polymorphisms in genes of respiratory chain complexes I (ND4), III (CYTB) and IV (COX3) were compared to a reference strain during aging. Analysis focused on ROS and ATP levels, bone marrow composition and blood counts. Additionally, hematopoietic restoration capacity following cytotoxic stress was tested. Mice with polymorphisms in ND4 and CYTB gene had significantly decreasing ROS levels in bone marrow cells during aging, without effecting ATP levels. In addition, the frequency of stem and progenitor cells increased during aging but the amount of lymphocytes in the peripheral blood decreased during aging. In summary, the presence of mtDNA polymorphisms affecting the respiratory chain complexes I, III and IV was associated with altered ROS levels as well as changes in BM and peripheral blood composition during aging.
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Affiliation(s)
- Christin Kretzschmar
- Department of Medicine III - Hematology/Oncology/Palliative Care, Rostock University Medical Center, Rostock, Germany
| | - Catrin Roolf
- Department of Medicine III - Hematology/Oncology/Palliative Care, Rostock University Medical Center, Rostock, Germany
| | - Katrin Timmer
- Department of Medicine III - Hematology/Oncology/Palliative Care, Rostock University Medical Center, Rostock, Germany
| | - Anett Sekora
- Department of Medicine III - Hematology/Oncology/Palliative Care, Rostock University Medical Center, Rostock, Germany
| | - Gudrun Knübel
- Department of Medicine III - Hematology/Oncology/Palliative Care, Rostock University Medical Center, Rostock, Germany
| | - Hugo Murua Escobar
- Department of Medicine III - Hematology/Oncology/Palliative Care, Rostock University Medical Center, Rostock, Germany
| | - Georg Fuellen
- Institute for Biostatistics and Informatics in Medicine and Ageing Research, Rostock University Medical Center, Rostock, Germany
| | - Saleh M Ibrahim
- Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany
| | - Markus Tiedge
- Institute of Medical Biochemistry and Molecular Biology, Rostock University Medical Center, Rostock, Germany
| | - Simone Baltrusch
- Institute of Medical Biochemistry and Molecular Biology, Rostock University Medical Center, Rostock, Germany
| | - Robert Jaster
- Department of Medicine II, Division of Gastroenterology, Rostock University Medical Center, Rostock, Germany
| | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Christian Junghanss
- Department of Medicine III - Hematology/Oncology/Palliative Care, Rostock University Medical Center, Rostock, Germany
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Tourmente M, Hirose M, Ibrahim S, Dowling DK, Tompkins DM, Roldan ERS, Gemmell NJ. mtDNA polymorphism and metabolic inhibition affect sperm performance in conplastic mice. Reproduction 2017; 154:341-354. [PMID: 28676531 DOI: 10.1530/rep-17-0206] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 06/23/2017] [Accepted: 07/04/2017] [Indexed: 12/12/2022]
Abstract
Whereas a broad link exists between nucleotide substitutions in the mitochondrial genome (mtDNA) and a range of metabolic pathologies, exploration of the effect of specific mtDNA genotypes is on-going. Mitochondrial DNA mutations are of particular relevance for reproductive traits, since they are expected to have profound effects on male specific processes as a result of the strict maternal inheritance of mtDNA. Sperm motility is crucially dependent on ATP in most systems studied. However, the importance of mitochondrial function in the production of the ATP necessary for sperm function remains uncertain. In this study, we test the effect of mtDNA polymorphisms upon mouse sperm performance and bioenergetics by using five conplastic inbred strains that share the same nuclear background while differing in their mitochondrial genomes. We found that, while genetic polymorphisms across distinct mtDNA haplotypes are associated with modification in sperm progressive velocity, this effect is not related to ATP production. Furthermore, there is no association between the number of mtDNA polymorphisms and either (a) the magnitude of sperm performance decrease, or (b) performance response to specific inhibition of the main sperm metabolic pathways. The observed variability between strains may be explained in terms of additive effects of single nucleotide substitutions on mtDNA coding sequences, which have been stabilized through genetic drift in the different laboratory strains. Alternatively, the decreased sperm performance might have arisen from the disruption of the nuclear DNA/mtDNA interactions that have coevolved during the radiation of Mus musculus subspecies.
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Affiliation(s)
- Maximiliano Tourmente
- Department of Biodiversity and Evolutionary BiologyMuseo Nacional de Ciencias Naturales (CSIC), Madrid, Spain
| | - Misa Hirose
- Institute of Experimental DermatologyUniversity of Luebeck, Luebeck, Germany
| | - Saleh Ibrahim
- Institute of Experimental DermatologyUniversity of Luebeck, Luebeck, Germany
| | - Damian K Dowling
- School of Biological SciencesMonash University, Clayton, Australia
| | | | - Eduardo R S Roldan
- Department of Biodiversity and Evolutionary BiologyMuseo Nacional de Ciencias Naturales (CSIC), Madrid, Spain
| | - Neil J Gemmell
- Department of AnatomyUniversity of Otago, Dunedin, New Zealand
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Uncoupling protein 2 protects mice from aging. Mitochondrion 2016; 30:42-50. [DOI: 10.1016/j.mito.2016.06.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 06/24/2016] [Accepted: 06/24/2016] [Indexed: 01/24/2023]
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