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O'Sullivan JDB, Terry S, Scott CA, Bullen A, Jagger DJ, Mann ZF. Mitochondrial dynamics regulate cell morphology in the developing cochlea. Development 2024; 151:dev202845. [PMID: 39120083 DOI: 10.1242/dev.202845] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Accepted: 07/08/2024] [Indexed: 08/10/2024]
Abstract
In multicellular tissues, the size and shape of cells are intricately linked with their physiological functions. In the vertebrate auditory organ, the neurosensory epithelium develops as a mosaic of sensory hair cells (HCs), and their glial-like supporting cells, which have distinct morphologies and functional properties at different frequency positions along its tonotopic long axis. In the chick cochlea, the basilar papilla (BP), proximal (high-frequency) HCs, are larger than their distal (low-frequency) counterparts, a morphological feature essential for sound perception. Mitochondrial dynamics, which constitute the equilibrium between fusion and fission, regulate differentiation and functional refinement across a variety of cell types. We investigate this as a potential mechanism for regulating the shape of developing HCs. Using live imaging in intact BP explants, we identify distinct remodelling of mitochondrial networks in proximal compared with distal HCs. Manipulating mitochondrial dynamics in developing HCs alters their normal morphology along the proximal-distal (tonotopic) axis. Inhibition of the mitochondrial fusion machinery decreased proximal HC surface area, whereas promotion of fusion increased the distal HC surface area. We identify mitochondrial dynamics as a key regulator of HC morphology in developing inner ear epithelia.
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Affiliation(s)
- James D B O'Sullivan
- Centre for Craniofacial and Regenerative Biology, King's College London, 27th Floor, Guy's Tower, London SE1 9RT, UK
| | - Stephen Terry
- UCL Ear Institute, University College London, 332 Gray's Inn Rd, London WC1X 8EE, UK
- The London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, UK
| | - Claire A Scott
- Centre for Craniofacial and Regenerative Biology, King's College London, 27th Floor, Guy's Tower, London SE1 9RT, UK
| | - Anwen Bullen
- UCL Ear Institute, University College London, 332 Gray's Inn Rd, London WC1X 8EE, UK
| | - Daniel J Jagger
- UCL Ear Institute, University College London, 332 Gray's Inn Rd, London WC1X 8EE, UK
| | - Zoë F Mann
- Centre for Craniofacial and Regenerative Biology, King's College London, 27th Floor, Guy's Tower, London SE1 9RT, UK
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2
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Eysert F, Kinoshita PF, Lagarde J, Lacas-Gervais S, Xicota L, Dorothée G, Bottlaender M, Checler F, Potier MC, Sarazin M, Chami M. Mitochondrial alterations in fibroblasts from sporadic Alzheimer's disease (AD) patients correlate with AD-related clinical hallmarks. Acta Neuropathol Commun 2024; 12:90. [PMID: 38851733 PMCID: PMC11161956 DOI: 10.1186/s40478-024-01807-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2024] [Accepted: 05/27/2024] [Indexed: 06/10/2024] Open
Abstract
Mitochondrial dysfunctions are key features of Alzheimer's disease (AD). The occurrence of these disturbances in the peripheral cells of AD patients and their potential correlation with disease progression are underinvestigated. We studied mitochondrial structure, function and mitophagy in fibroblasts from healthy volunteers and AD patients at the prodromal (AD-MCI) or demented (AD-D) stages. We carried out correlation studies with clinical cognitive scores, namely, (i) Mini-Mental State Examination (MMSE) and (ii) Dementia Rating-Scale Sum of Boxes (CDR-SOB), and with (iii) amyloid beta (Aβ) plaque burden (PiB-PET imaging) and (iv) the accumulation of peripheral amyloid precursor protein C-terminal fragments (APP-CTFs). We revealed alterations in mitochondrial structure as well as specific mitochondrial dysfunction signatures in AD-MCI and AD-D fibroblasts and revealed that defective mitophagy and autophagy are linked to impaired lysosomal activity in AD-D fibroblasts. We reported significant correlations of a subset of these dysfunctions with cognitive decline, AD-related clinical hallmarks and peripheral APP-CTFs accumulation. This study emphasizes the potential use of peripheral cells for investigating AD pathophysiology.
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Affiliation(s)
- Fanny Eysert
- INSERM, CNRS, Institute of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, 660 Route des Lucioles, 06560, Sophia-Antipolis, Valbonne, France
| | - Paula-Fernanda Kinoshita
- INSERM, CNRS, Institute of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, 660 Route des Lucioles, 06560, Sophia-Antipolis, Valbonne, France
| | - Julien Lagarde
- Department of Neurology of Memory and Language, GHU Paris Psychiatrie & Neurosciences, Hôpital Sainte Anne, 75014, Paris, France
- Université Paris-Cité, 75006, Paris, France
- BioMaps, Service Hospitalier Frédéric Joliot CEA, CNRS, Inserm, Université Paris-Saclay, 91401, Orsay, France
| | - Sandra Lacas-Gervais
- Centre Commun de Microscopie Appliquée, Université de Nice Côte d'Azur, 06108, Nice, France
| | - Laura Xicota
- UPMC University Paris 06, UMRS 1127, Sorbonne Universités, Paris, France
- ICM Research Center, CNRS UMR 7225, Paris, France
| | - Guillaume Dorothée
- Inserm, Centre de Recherche Saint-Antoine, CRSA, Immune System and Neuroinflammation Laboratory, Hôpital Saint-Antoine, Sorbonne Université, 75012, Paris, France
| | - Michel Bottlaender
- BioMaps, Service Hospitalier Frédéric Joliot CEA, CNRS, Inserm, Université Paris-Saclay, 91401, Orsay, France
- UNIACT, Neurospin, Joliot Institute, CEA, Université Paris-Saclay, 91140, Gif sur Yvette, France
| | - Frédéric Checler
- INSERM, CNRS, Institute of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, 660 Route des Lucioles, 06560, Sophia-Antipolis, Valbonne, France
| | - Marie-Claude Potier
- UPMC University Paris 06, UMRS 1127, Sorbonne Universités, Paris, France
- ICM Research Center, CNRS UMR 7225, Paris, France
| | - Marie Sarazin
- Department of Neurology of Memory and Language, GHU Paris Psychiatrie & Neurosciences, Hôpital Sainte Anne, 75014, Paris, France
- Université Paris-Cité, 75006, Paris, France
- BioMaps, Service Hospitalier Frédéric Joliot CEA, CNRS, Inserm, Université Paris-Saclay, 91401, Orsay, France
| | - Mounia Chami
- INSERM, CNRS, Institute of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, 660 Route des Lucioles, 06560, Sophia-Antipolis, Valbonne, France.
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3
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Lee C, Wallace DC, Burke PJ. Super-Resolution Imaging of Voltages in the Interior of Individual, Vital Mitochondria. ACS NANO 2024; 18:1345-1356. [PMID: 37289571 PMCID: PMC10795477 DOI: 10.1021/acsnano.3c02768] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 06/02/2023] [Indexed: 06/10/2023]
Abstract
We present super-resolution microscopy of isolated functional mitochondria, enabling real-time studies of structure and function (voltages) in response to pharmacological manipulation. Changes in mitochondrial membrane potential as a function of time and position can be imaged in different metabolic states (not possible in whole cells), created by the addition of substrates and inhibitors of the electron transport chain, enabled by the isolation of vital mitochondria. By careful analysis of structure dyes and voltage dyes (lipophilic cations), we demonstrate that most of the fluorescent signal seen from voltage dyes is due to membrane bound dyes, and develop a model for the membrane potential dependence of the fluorescence contrast for the case of super-resolution imaging, and how it relates to membrane potential. This permits direct analysis of mitochondrial structure and function (voltage) of isolated, individual mitochondria as well as submitochondrial structures in the functional, intact state, a major advance in super-resolution studies of living organelles.
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Affiliation(s)
- ChiaHung Lee
- Department
of Electrical Engineering and Computer Science, Department of Biomedical
Engineering, University of California, Irvine, California 92697, United States
| | - Douglas C. Wallace
- Center
for Mitochondrial and Epigenomic Medicine, Children’s Hospital
of Philadelphia and Department of Pediatrics, Division of Human Genetics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Peter J. Burke
- Department
of Electrical Engineering and Computer Science, Department of Biomedical
Engineering, University of California, Irvine, California 92697, United States
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4
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Stryhn JKG, Larsen J, Pedersen PL, Gæde PH. Subclinical hypothyroidism in pregnancy - assessment of offspring thyroid status and mitochondrial robustness to stress. Scand J Clin Lab Invest 2023; 83:501-508. [PMID: 37942740 DOI: 10.1080/00365513.2023.2253726] [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: 05/05/2023] [Accepted: 08/28/2023] [Indexed: 11/10/2023]
Abstract
Subclinical hypothyroidism's clinical implications on pregnancy are controversial. Consequently, thyrotropin (TSH) cutoff-values for pregnancy are continuously a subject for debate. In subclinical hypothyroidism, altered levels of thyroid hormones may affect mitochondrial function.Objectives were i) to analyze thyroid hormone levels in offspring of women with and without subclinical hypothyroidism ii) to analyze mitochondrial "robustness" in terms of MTG/TMRM ratio in pregnant women and their offspring in relation to thyroid function and iii) to perform differentiate analyses on different TSH thresholds to determine the importance of cutoff-values to results.Pregnant women were included by blood collections prior to a planned cesarean section, and cord samples were collected after delivery. Thyroid status (analyzed by Siemens Healthcare Diagnostics by an electrochemical luminescent immunoassay based on LOCI-technology) grouped the women and their offspring in euthyroid or subclinical hypothyroid, with groups established from previous recommended third-trimester cutoff-value (TSH > 3.0 mIU/L) and the recently recommended cutoff-value in Denmark (TSH > 3.7 mIU/L). Flow cytometric measurements of mitochondrial function in mononuclear blood cells with the fluorophores TetraMethylRhodamine Methyl Ester (TMRM) and Mitotracker Green (MTG) were used to evaluate mitochondrial robustness as the MTG/TMRM ratio.No significant differences in mitochondrial robustness between euthyroid and subclinical hypothyroid cohorts were observed, irrespective of TSH-cutoff applied. Maternal and cord MTG/TMRM ratios were positively correlated. Cord-TSH was elevated in subclinical hypothyroid offspring, independent of TSH cutoff applied. Cord-TSH was associated with maternal TSH-level, maternal smoking and cord arterial-pH.
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Affiliation(s)
- Julie Kristine Guldberg Stryhn
- Department of Gynecology and Obstetrics, Slagelse Hospital, Slagelse, Denmark
- Mitochondria Research Unit, Naestved Hospital, Naestved, Denmark
- Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - Jacob Larsen
- Mitochondria Research Unit, Naestved Hospital, Naestved, Denmark
- Department of Clinical Pathology, Roskilde Hospital, Roskilde, Denmark
| | - Palle Lyngsie Pedersen
- Mitochondria Research Unit, Naestved Hospital, Naestved, Denmark
- Department of Clinical Biochemistry, Naestved Hospital, Naestved, Denmark
| | - Peter Haulund Gæde
- Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
- Department of Internal Medicine, Slagelse Hospital, Slagelse, Denmark
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5
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O'Sullivan JDB, Blacker TS, Scott C, Chang W, Ahmed M, Yianni V, Mann ZF. Gradients of glucose metabolism regulate morphogen signalling required for specifying tonotopic organisation in the chicken cochlea. eLife 2023; 12:e86233. [PMID: 37539863 PMCID: PMC10425173 DOI: 10.7554/elife.86233] [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: 01/17/2023] [Accepted: 08/03/2023] [Indexed: 08/05/2023] Open
Abstract
In vertebrates with elongated auditory organs, mechanosensory hair cells (HCs) are organised such that complex sounds are broken down into their component frequencies along a proximal-to-distal long (tonotopic) axis. Acquisition of unique morphologies at the appropriate position along the chick cochlea, the basilar papilla, requires that nascent HCs determine their tonotopic positions during development. The complex signalling within the auditory organ between a developing HC and its local niche along the cochlea is poorly understood. Using a combination of live imaging and NAD(P)H fluorescence lifetime imaging microscopy, we reveal that there is a gradient in the cellular balance between glycolysis and the pentose phosphate pathway in developing HCs along the tonotopic axis. Perturbing this balance by inhibiting different branches of cytosolic glucose catabolism disrupts developmental morphogen signalling and abolishes the normal tonotopic gradient in HC morphology. These findings highlight a causal link between graded morphogen signalling and metabolic reprogramming in specifying the tonotopic identity of developing HCs.
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Affiliation(s)
- James DB O'Sullivan
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry Oral and Craniofacial Sciences, King's College LondonLondonUnited Kingdom
| | - Thomas S Blacker
- Research Department of Structural and Molecular Biology, University College LondonLondonUnited Kingdom
| | - Claire Scott
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry Oral and Craniofacial Sciences, King's College LondonLondonUnited Kingdom
| | - Weise Chang
- National Institute on Deafness and Other Communication Disorders, National Institutes of HealthBethesdaUnited States
| | - Mohi Ahmed
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry Oral and Craniofacial Sciences, King's College LondonLondonUnited Kingdom
| | - Val Yianni
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry Oral and Craniofacial Sciences, King's College LondonLondonUnited Kingdom
| | - Zoe F Mann
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry Oral and Craniofacial Sciences, King's College LondonLondonUnited Kingdom
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Elías-López AL, Vázquez-Mena O, Sferruzzi-Perri AN. Mitochondrial dysfunction in the offspring of obese mothers and it's transmission through damaged oocyte mitochondria: Integration of mechanisms. Biochim Biophys Acta Mol Basis Dis 2023:166802. [PMID: 37414229 DOI: 10.1016/j.bbadis.2023.166802] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 05/23/2023] [Accepted: 06/29/2023] [Indexed: 07/08/2023]
Abstract
In vivo and in vitro studies demonstrate that mitochondria in the oocyte, are susceptible to damage by suboptimal pre/pregnancy conditions, such as obesity. These suboptimal conditions have been shown to induce mitochondrial dysfunction (MD) in multiple tissues of the offspring, suggesting that mitochondria of oocytes that pass from mother to offspring, can carry information that can programme mitochondrial and metabolic dysfunction of the next generation. They also suggest that transmission of MD could increase the risk of obesity and other metabolic diseases in the population inter- and trans-generationally. In this review, we examined whether MD observed in offspring tissues of high energetic demand, is the result of the transmission of damaged mitochondria from obese mothers' oocytes to the offspring. The contribution of genome-independent mechanisms (namely mitophagy) in this transmission were also explored. Finally, potential interventions aimed at improving oocyte/embryo health were investigated, to see if they may provide an opportunity to halter the generational effects of MD.
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Affiliation(s)
- A L Elías-López
- Dirección de Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán", Mexico.
| | | | - A N Sferruzzi-Perri
- Centre for Trophoblast Research, Department of Physiology, Development and Neuroscience, University of Cambridge, UK.
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7
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Weidinger A, Milivojev N, Hosmann A, Duvigneau JC, Szabo C, Törö G, Rauter L, Vaglio-Garro A, Mkrtchyan GV, Trofimova L, Sharipov RR, Surin AM, Krasilnikova IA, Pinelis VG, Tretter L, Moldzio R, Bayır H, Kagan VE, Bunik VI, Kozlov AV. Oxoglutarate dehydrogenase complex controls glutamate-mediated neuronal death. Redox Biol 2023; 62:102669. [PMID: 36933393 PMCID: PMC10031542 DOI: 10.1016/j.redox.2023.102669] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/03/2023] [Accepted: 03/10/2023] [Indexed: 03/14/2023] Open
Abstract
Brain injury is accompanied by neuroinflammation, accumulation of extracellular glutamate and mitochondrial dysfunction, all of which cause neuronal death. The aim of this study was to investigate the impact of these mechanisms on neuronal death. Patients from the neurosurgical intensive care unit suffering aneurysmal subarachnoid hemorrhage (SAH) were recruited retrospectively from a respective database. In vitro experiments were performed in rat cortex homogenate, primary dissociated neuronal cultures, B35 and NG108-15 cell lines. We employed methods including high resolution respirometry, electron spin resonance, fluorescent microscopy, kinetic determination of enzymatic activities and immunocytochemistry. We found that elevated levels of extracellular glutamate and nitric oxide (NO) metabolites correlated with poor clinical outcome in patients with SAH. In experiments using neuronal cultures we showed that the 2-oxoglutarate dehydrogenase complex (OGDHC), a key enzyme of the glutamate-dependent segment of the tricarboxylic acid (TCA) cycle, is more susceptible to the inhibition by NO than mitochondrial respiration. Inhibition of OGDHC by NO or by succinyl phosphonate (SP), a highly specific OGDHC inhibitor, caused accumulation of extracellular glutamate and neuronal death. Extracellular nitrite did not substantially contribute to this NO action. Reactivation of OGDHC by its cofactor thiamine (TH) reduced extracellular glutamate levels, Ca2+ influx into neurons and cell death rate. Salutary effect of TH against glutamate toxicity was confirmed in three different cell lines. Our data suggest that the loss of control over extracellular glutamate, as described here, rather than commonly assumed impaired energy metabolism, is the critical pathological manifestation of insufficient OGDHC activity, leading to neuronal death.
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Affiliation(s)
- Adelheid Weidinger
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Nadja Milivojev
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, Vienna, Austria
| | - Arthur Hosmann
- Department of Neurosurgery, Medical University of Vienna, Vienna, Austria
| | - J Catharina Duvigneau
- Institute for Medical Biochemistry, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Csaba Szabo
- University of Fribourg, Section of Science and Medicine, Department of Oncology, Microbiology and Immunology, Section of Pharmacology, Fribourg, Switzerland; Department of Anesthesiology, University of Texas Medical Branch, Galveston, TX, USA
| | - Gabor Törö
- Department of Anesthesiology, University of Texas Medical Branch, Galveston, TX, USA
| | - Laurin Rauter
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, Vienna, Austria
| | - Annette Vaglio-Garro
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Garik V Mkrtchyan
- A. N. Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University, 119234, Moscow, Russia
| | - Lidia Trofimova
- Biological Faculty, Department of Biophysics, Lomonosov Moscow State University, Moscow, Russia
| | - Rinat R Sharipov
- Institute of General Pathology and Pathophysiology, Laboratory of Fundamental and Applied Problems of Pain, Moscow, Russia
| | - Alexander M Surin
- Institute of General Pathology and Pathophysiology, Laboratory of Fundamental and Applied Problems of Pain, Moscow, Russia; National Medical Research Center of Children's Health, Russian Ministry of Health, Laboratory of Neurobiology and Brain Development, Moscow, Russia
| | - Irina A Krasilnikova
- National Medical Research Center of Children's Health, Russian Ministry of Health, Laboratory of Neurobiology and Brain Development, Moscow, Russia
| | - Vsevolod G Pinelis
- National Medical Research Center of Children's Health, Russian Ministry of Health, Laboratory of Neurobiology and Brain Development, Moscow, Russia
| | - Laszlo Tretter
- Department of Biochemistry, Semmelweis University, Budapest, Hungary
| | - Rudolf Moldzio
- Institute for Medical Biochemistry, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Hülya Bayır
- Departments of Environmental and Occupational Health, Pharmacology and Chemical Biology, Chemistry and Center for Free Radical and Antioxidant Health University of Pittsburgh, Pittsburgh, PA, USA; Department of Critical Care Medicine, Safar Center for Resuscitation Research, Children's Neuroscience Institute, Children's Hospital of Pittsburgh, University of Pittsburgh, Pittsburgh, PA, USA
| | - Valerian E Kagan
- Departments of Environmental and Occupational Health, Pharmacology and Chemical Biology, Chemistry and Center for Free Radical and Antioxidant Health University of Pittsburgh, Pittsburgh, PA, USA
| | - Victoria I Bunik
- A. N. Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University, 119234, Moscow, Russia; Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, Russia; Department of Biochemistry, Sechenov University, Moscow, Russia
| | - Andrey V Kozlov
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria.
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Ashok D, Papanicolaou K, Sidor A, Wang M, Solhjoo S, Liu T, O'Rourke B. Mitochondrial membrane potential instability on reperfusion after ischemia does not depend on mitochondrial Ca 2+ uptake. J Biol Chem 2023; 299:104708. [PMID: 37061004 PMCID: PMC10206190 DOI: 10.1016/j.jbc.2023.104708] [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: 02/24/2022] [Revised: 03/21/2023] [Accepted: 04/09/2023] [Indexed: 04/17/2023] Open
Abstract
Physiologic Ca2+ entry via the Mitochondrial Calcium Uniporter (MCU) participates in energetic adaption to workload but may also contribute to cell death during ischemia/reperfusion (I/R) injury. The MCU has been identified as the primary mode of Ca2+ import into mitochondria. Several groups have tested the hypothesis that Ca2+ import via MCU is detrimental during I/R injury using genetically-engineered mouse models, yet the results from these studies are inconclusive. Furthermore, mitochondria exhibit unstable or oscillatory membrane potentials (ΔΨm) when subjected to stress, such as during I/R, but it is unclear if the primary trigger is an excess influx of mitochondrial Ca2+ (mCa2+), reactive oxygen species (ROS) accumulation, or other factors. Here, we critically examine whether MCU-mediated mitochondrial Ca2+ uptake during I/R is involved in ΔΨm instability, or sustained mitochondrial depolarization, during reperfusion by acutely knocking out MCU in neonatal mouse ventricular myocyte (NMVM) monolayers subjected to simulated I/R. Unexpectedly, we find that MCU knockout does not significantly alter mCa2+ import during I/R, nor does it affect ΔΨm recovery during reperfusion. In contrast, blocking the mitochondrial sodium-calcium exchanger (mNCE) suppressed the mCa2+ increase during Ischemia but did not affect ΔΨm recovery or the frequency of ΔΨm oscillations during reperfusion, indicating that mitochondrial ΔΨm instability on reperfusion is not triggered by mCa2+. Interestingly, inhibition of mitochondrial electron transport or supplementation with antioxidants stabilized I/R-induced ΔΨm oscillations. The findings are consistent with mCa2+ overload being mediated by reverse-mode mNCE activity and supporting ROS-induced ROS release as the primary trigger of ΔΨm instability during reperfusion injury.
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Affiliation(s)
- Deepthi Ashok
- Johns Hopkins University, Division of Cardiology, Department of Medicine, Baltimore, Maryland, USA
| | - Kyriakos Papanicolaou
- Johns Hopkins University, Division of Cardiology, Department of Medicine, Baltimore, Maryland, USA
| | - Agnieszka Sidor
- Johns Hopkins University, Division of Cardiology, Department of Medicine, Baltimore, Maryland, USA
| | - Michelle Wang
- Johns Hopkins University, Division of Cardiology, Department of Medicine, Baltimore, Maryland, USA
| | - Soroosh Solhjoo
- Johns Hopkins University, Division of Cardiology, Department of Medicine, Baltimore, Maryland, USA
| | - Ting Liu
- Johns Hopkins University, Division of Cardiology, Department of Medicine, Baltimore, Maryland, USA
| | - Brian O'Rourke
- Johns Hopkins University, Division of Cardiology, Department of Medicine, Baltimore, Maryland, USA.
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9
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Ding Y, Zhang S, Guo Q, Leng J. Mitochondrial Diabetes Is Associated with the ND4 G11696A Mutation. Biomolecules 2023; 13:907. [PMID: 37371486 DOI: 10.3390/biom13060907] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 05/21/2023] [Accepted: 05/25/2023] [Indexed: 06/29/2023] Open
Abstract
Type 2 diabetes mellitus (T2DM) is a common endocrine disorder which remains a large challenge for clinicians. Previous studies have suggested that mitochondrial dysfunction plays an active role in T2DM progression, but a detailed mechanism is still elusive. In the current study, two Han Chinese families with maternally inherited T2DM were evaluated using clinical, genetic, molecular, and biochemical analyses. The mitochondrial genomes were PCR amplified and sequenced. Phylogenetic and bioinformatic analyses were used to assess the potential pathogenicity of mitochondrial DNA (mtDNA) mutations. Interestingly, the matrilineal relatives of these pedigrees exhibited variable severity of T2DM, in particular, the age at onset of T2DM varied from 26 to 65 years, with an average of 49 years. Sequence analysis revealed the presence of ND4 G11696A mutation, which resulted in the substitution of an isoleucine for valine at amino acid (AA) position 312. Indeed, this mutation was present in homoplasmy only in the maternal lineage, not in other members of these families, as well as 200 controls. Furthermore, the m.C5601T in the tRNAAla and novel m.T5813C in the tRNACys, showing high evolutional conservation, may contribute to the phenotypic expression of ND4 G11696A mutation. In addition, biochemical analysis revealed that cells with ND4 G11696A mutation exhibited higher levels of reactive oxygen species (ROS) productions than the controls. In contrast, the levels of mitochondrial membrane potential (MMP), ATP, mtDNA copy number (mtDNA-CN), Complex I activity, and NAD+/NADH ratio significantly decreased in cell lines carrying the m.G11696A and tRNA mutations, suggesting that these mutations affected the respiratory chain function and led to mitochondrial dysfunction that was involved in T2DM. Thus, our study broadened the clinical phenotypes of m.G11696A mutation.
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Affiliation(s)
- Yu Ding
- Central Laboratory, Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
| | - Shunrong Zhang
- Department of Geriatrics, Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
| | - Qinxian Guo
- Central Laboratory, Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
| | - Jianhang Leng
- Central Laboratory, Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
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10
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Czajkowska K, Ajduk A. Mitochondrial activity and redox status in oocytes from old mice: The interplay between maternal and postovulatory aging. Theriogenology 2023; 204:18-30. [PMID: 37031516 DOI: 10.1016/j.theriogenology.2023.03.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 03/30/2023] [Accepted: 03/30/2023] [Indexed: 04/07/2023]
Abstract
Maternal aging has been reported to reduce oocyte quality and, in turn, lower the developmental potential of the resulting embryos. Here, we show that maternally aged oocytes display two strikingly different phenotypes: some have normal morphology, whereas others have significantly shrunk cytoplasm. The latter phenotype usually prevails in aged females. Our objective was to characterize both types of maternally aged oocytes and investigate the origins of this diversity. Importantly, our experiments indicate that shrunk maternally aged oocytes are severely compromised in terms of mitochondrial functionality as compared to their young or morphologically normal maternally aged counterparts: they display significantly decreased mitochondrial activity and lower amounts of ROS. In contrast, morphologically normal maternally aged oocytes had the same mitochondrial activity as young ones, while their ROS levels were higher. Surprisingly, the shrunk phenotype was completely absent in maternally aged oocytes that matured in vitro, suggesting that it is not caused inherently by maternal aging, but may be related to other factors, like postovulatory aging. Indeed, an additional culture of in vitro matured young and old oocytes (i.e., in vitro postovulatory aging) significantly decreased their mitochondrial activity and led to cytoplasm shrinkage. In vivo postovulatory aging had a similar effect on oocytes from both young and old females. Finally, we examined the developmental potential of oocytes obtained from aged females. Shrunk (i.e., most likely postovulatory aged) oocytes failed to become fertilized, whereas morphologically normal ones (i.e., most likely not subjected to postovulatory aging) underwent fertilization and subsequent cleavage divisions, although they achieved the 2-cell stage less frequently than morphologically normal oocytes from young females. Importantly, the quality of blastocysts as well as the live birth rate for morphologically normal oocytes from old and young females were similar. In summary, our data clearly indicate that two pools of oocytes present in oviducts of aged females differ significantly in their quality and developmental potential and that the more severely affected phenotype results most likely from a synergistic action of maternal and postovulatory aging.
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11
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Dramé M, Garcia-Rodriguez FJ, Buchrieser C, Escoll P. High-content assay to measure mitochondrial function and bacterial vacuole size in infected human primary macrophages. STAR Protoc 2023; 4:102175. [PMID: 36933221 PMCID: PMC10031535 DOI: 10.1016/j.xpro.2023.102175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 12/19/2022] [Accepted: 02/22/2023] [Indexed: 03/19/2023] Open
Abstract
Regulation of bioenergetics and cell death are pivotal mitochondrial functions determining the responses of macrophages to infection. Here, we provide a protocol to investigate mitochondrial functions during infection of macrophages by intracellular bacteria. We describe steps for quantifying mitochondrial polarization, cell death, and bacterial infection in infected, living, human primary macrophages at the single-cell level. We also detail the use of the pathogen Legionella pneumophila as model. This protocol can be adapted to investigate mitochondrial functions in other settings. For complete details on the use and execution of this protocol, please refer to Escoll et al. (2021).1.
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Affiliation(s)
- Mariatou Dramé
- Institut Pasteur, Université Paris Cité, CNRS UMR 6047, Biologie des Bactéries Intracellulaires, 75015 Paris, France
| | | | - Carmen Buchrieser
- Institut Pasteur, Université Paris Cité, CNRS UMR 6047, Biologie des Bactéries Intracellulaires, 75015 Paris, France.
| | - Pedro Escoll
- Institut Pasteur, Université Paris Cité, CNRS UMR 6047, Biologie des Bactéries Intracellulaires, 75015 Paris, France.
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12
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O'Sullivan JDB, Bullen A, Mann ZF. Mitochondrial form and function in hair cells. Hear Res 2023; 428:108660. [PMID: 36525891 DOI: 10.1016/j.heares.2022.108660] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 11/07/2022] [Accepted: 11/23/2022] [Indexed: 11/27/2022]
Abstract
Hair cells (HCs) are specialised sensory receptors residing in the neurosensory epithelia of inner ear sense organs. The precise morphological and physiological properties of HCs allow us to perceive sound and interact with the world around us. Mitochondria play a significant role in normal HC function and are also intricately involved in HC death. They generate ATP essential for sustaining the activity of ion pumps, Ca2+ transporters and the integrity of the stereociliary bundle during transduction as well as regulating cytosolic calcium homoeostasis during synaptic transmission. Advances in imaging techniques have allowed us to study mitochondrial populations throughout the HC, and how they interact with other organelles. These analyses have identified distinct mitochondrial populations between the apical and basolateral portions of the HC, in which mitochondrial morphology appears determined by the physiological processes in the different cellular compartments. Studies in HCs across species show that ototoxic agents, ageing and noise damage directly impact mitochondrial structure and function resulting in HC death. Deciphering the molecular mechanisms underlying this mitochondrial sensitivity, and how their morphology relates to their function during HC death, requires that we first understand this relationship in the context of normal HC function.
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Affiliation(s)
- James D B O'Sullivan
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral, Craniofacial Sciences, King's College London, London SE1 9RT, U.K
| | - Anwen Bullen
- UCL Ear Institute, University College London, London WC1×8EE, U.K.
| | - Zoë F Mann
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral, Craniofacial Sciences, King's College London, London SE1 9RT, U.K.
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13
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Sinha N, Driscoll CS, Qi W, Huang B, Roy S, Knott JG, Wang J, Sen A. Anti-Müllerian hormone (AMH) treatment enhances oocyte quality, embryonic development and live birth rate. Biol Reprod 2022; 107:813-822. [DOI: 10.1093/biolre/ioac116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/24/2022] [Accepted: 05/24/2022] [Indexed: 11/13/2022] Open
Abstract
Abstract
Anti-Müllerian hormone (AMH) produced by the granulosa cells of growing follicles is critical for folliculogenesis and is clinically used as a diagnostic and/or prognostic marker of female fertility. Previous studies report that AMH-pretreatment in mice creates a pool of quiescent follicles that are released following superovulation, resulting in increased number of ovulated oocytes. However, the quality and developmental competency of oocytes derived from AMH-induced accumulated follicles as well as the effect of AMH treatment on live birth are not known. This study reports that AMH priming positively affects oocyte maturation and early embryonic development culminating in higher number of live births. Our results show that AMH treatment results in good quality oocytes with higher developmental competence that enhances embryonic development resulting in blastocysts with greater gene expression. Transcriptome analysis of oocytes from AMH-primed compared to control mice reveal that AMH upregulates a large number of genes and pathways associated with oocyte quality and embryonic development. Mitochondrial function is the most affected pathway by AMH priming, that is supported by higher number of active mitochondria, mitochondrial DNA content and ATP levels in oocytes and embryos isolated from AMH-primed compared to control animals. These studies for the first time provide an insight into the overall impact of AMH on female fertility and highlight critical knowledge necessary to develop AMH as a therapeutic option to improve female fertility.
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Affiliation(s)
- Niharika Sinha
- Reproductive and Developmental Sciences Program , Department of Animal Science
| | - Chad S Driscoll
- Reproductive and Developmental Sciences Program , Department of Animal Science
| | - Wenjie Qi
- Department of Computational Mathematics , Science and Engineering, Michigan State University, East Lansing, MI 48824 , USA
| | - Binbin Huang
- Department of Computational Mathematics , Science and Engineering, Michigan State University, East Lansing, MI 48824 , USA
| | - Sambit Roy
- Reproductive and Developmental Sciences Program , Department of Animal Science
| | - Jason G Knott
- Reproductive and Developmental Sciences Program , Department of Animal Science
| | - Jianrong Wang
- Department of Computational Mathematics , Science and Engineering, Michigan State University, East Lansing, MI 48824 , USA
| | - Aritro Sen
- Reproductive and Developmental Sciences Program , Department of Animal Science
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14
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Acute and Delayed Effects of Mechanical Injury on Calcium Homeostasis and Mitochondrial Potential of Primary Neuroglial Cell Culture: Potential Causal Contributions to Post-Traumatic Syndrome. Int J Mol Sci 2022; 23:ijms23073858. [PMID: 35409216 PMCID: PMC8998891 DOI: 10.3390/ijms23073858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/24/2022] [Accepted: 03/29/2022] [Indexed: 02/07/2023] Open
Abstract
In vitro models of traumatic brain injury (TBI) help to elucidate the pathological mechanisms responsible for cell dysfunction and death. To simulate in vitro the mechanical brain trauma, primary neuroglial cultures were scratched during different periods of network formation. Fluorescence microscopy was used to measure changes in intracellular free Ca2+ concentration ([Ca2+]i) and mitochondrial potential (ΔΨm) a few minutes later and on days 3 and 7 after scratching. An increase in [Ca2+]i and a decrease in ΔΨm were observed ~10 s after the injury in cells located no further than 150–200 µm from the scratch border. Ca2+ entry into cells during mechanical damage of the primary neuroglial culture occurred predominantly through the NMDA-type glutamate ionotropic channels. MK801, an inhibitor of this type of glutamate receptor, prevented an acute increase in [Ca2+]i in 99% of neurons. Pathological changes in calcium homeostasis persisted in the primary neuroglial culture for one week after injury. Active cell migration in the scratch area occurred on day 11 after neurotrauma and was accompanied by a decrease in the ratio of live to dead cells in the areas adjacent to the injury. Immunohistochemical staining of glial fibrillary acidic protein and β-III tubulin showed that neuronal cells migrated to the injured area earlier than glial cells, but their repair potential was insufficient for survival. Mitochondrial Ca2+ overload and a drop in ΔΨm may cause delayed neuronal death and thus play a key role in the development of the post-traumatic syndrome. Preventing prolonged ΔΨm depolarization may be a promising therapeutic approach to improve neuronal survival after traumatic brain injury.
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15
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Audi SH, Ganesh S, Taheri P, Zhang X, Dash RK, Clough AV, Jacobs ER. Depolarized mitochondrial membrane potential and protection with duroquinone in isolated perfused lungs from rats exposed to hyperoxia. J Appl Physiol (1985) 2022; 132:346-356. [PMID: 34941441 PMCID: PMC8816614 DOI: 10.1152/japplphysiol.00565.2021] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Dissipation of mitochondrial membrane potential (Δψm) is a hallmark of mitochondrial dysfunction. Our objective was to use a previously developed experimental-computational approach to estimate tissue Δψm in intact lungs of rats exposed to hyperoxia and to evaluate the ability of duroquinone (DQ) to reverse any hyperoxia-induced depolarization of lung Δψm. Rats were exposed to hyperoxia (>95% O2) or normoxia (room air) for 48 h, after which lungs were excised and connected to a ventilation-perfusion system. The experimental protocol consisted of measuring the concentration of the fluorescent dye rhodamine 6 G (R6G) during three single-pass phases: loading, washing, and uncoupling, in which the lungs were perfused with and without R6G and with the mitochondrial uncoupler FCCP, respectively. For normoxic lungs, the protocol was repeated with 1) rotenone (complex I inhibitor), 2) rotenone and either DQ or its vehicle (DMSO), and 3) rotenone, glutathione (GSH), and either DQ or DMSO added to the perfusate. Hyperoxic lungs were studied with and without DQ and GSH added to the perfusate. Computational modeling was used to estimate lung Δψm from R6G data. Rat exposure to hyperoxia resulted in partial depolarization (-33 mV) of lung Δψm and complex I inhibition depolarized lung Δψm by -83 mV. Results also demonstrate the efficacy of DQ to fully reverse both rotenone- and hyperoxia-induced lung Δψm depolarization. This study demonstrates hyperoxia-induced Δψm depolarization in intact lungs and the utility of this approach for assessing the impact of potential therapies such as exogenous quinones that target mitochondria in intact lungs.NEW & NOTEWORTHY This study is the first to measure hyperoxia-induced Δψm depolarization in isolated perfused lungs. Hyperoxia resulted in a partial depolarization of Δψm, which was fully reversed with duroquinone, demonstrating the utility of this approach for assessing the impact of potential therapies that target mitochondria such as exogenous quinones.
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Affiliation(s)
- Said H. Audi
- 1Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin,2Clement J. Zablocki V.A. Medical Center, Milwaukee, Wisconsin,3Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Swetha Ganesh
- 1Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Pardis Taheri
- 1Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Xiao Zhang
- 1Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Ranjan K. Dash
- 1Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Anne V. Clough
- 2Clement J. Zablocki V.A. Medical Center, Milwaukee, Wisconsin,3Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin,4Department of Mathematical and Statistical Sciences, Marquette University, Milwaukee, Wisconsin
| | - Elizabeth R. Jacobs
- 2Clement J. Zablocki V.A. Medical Center, Milwaukee, Wisconsin,3Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
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16
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Ji J, Damschroder D, Bessert D, Lazcano P, Wessells R, Reynolds CA, Greenberg ML. NAD supplementation improves mitochondrial performance of cardiolipin mutants. Biochim Biophys Acta Mol Cell Biol Lipids 2022; 1867:159094. [PMID: 35051613 PMCID: PMC8883178 DOI: 10.1016/j.bbalip.2021.159094] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 11/28/2021] [Accepted: 12/09/2021] [Indexed: 12/01/2022]
Abstract
Cardiolipin (CL) deficiency causes mitochondrial dysfunction and aberrant metabolism that are associated in humans with the severe disease Barth syndrome (BTHS). Several metabolic abnormalities are observed in BTHS patients and model systems, including decreased oxidative phosphorylation, reduced tricarboxylic acid (TCA) cycle flux, and accumulated lactate and D-β-hydroxybutyrate, which strongly suggests that nicotinamide adenine dinucleotide (NAD) redox metabolism may be altered in CL-deficient cells. In this study, we identified abnormal NAD+ metabolism in multiple BTHS model systems and demonstrate that supplementation of NAD+ precursors such as nicotinamide mononucleotide (NMN) improves mitochondrial function. Improved mitochondrial function in the Drosophila model was associated with restored exercise endurance, which suggests a potential therapeutic benefit of NAD+ precursor supplementation in the management of BTHS patients.
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Affiliation(s)
- Jiajia Ji
- Department of Biological Sciences, College of Liberal Arts and Sciences, Wayne State University, Detroit, MI, United States of America
| | - Deena Damschroder
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI, United States of America
| | - Denise Bessert
- Department of Emergency Medicine, Wayne State University School of Medicine, Detroit, MI, United States of America
| | - Pablo Lazcano
- Department of Biological Sciences, College of Liberal Arts and Sciences, Wayne State University, Detroit, MI, United States of America
| | - Robert Wessells
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI, United States of America
| | - Christian A Reynolds
- Department of Emergency Medicine, Wayne State University School of Medicine, Detroit, MI, United States of America.
| | - Miriam L Greenberg
- Department of Biological Sciences, College of Liberal Arts and Sciences, Wayne State University, Detroit, MI, United States of America.
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17
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Bakaeva Z, Lizunova N, Tarzhanov I, Boyarkin D, Petrichuk S, Pinelis V, Fisenko A, Tuzikov A, Sharipov R, Surin A. Lipopolysaccharide From E. coli Increases Glutamate-Induced Disturbances of Calcium Homeostasis, the Functional State of Mitochondria, and the Death of Cultured Cortical Neurons. Front Mol Neurosci 2022; 14:811171. [PMID: 35069113 PMCID: PMC8767065 DOI: 10.3389/fnmol.2021.811171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 12/06/2021] [Indexed: 11/13/2022] Open
Abstract
Lipopolysaccharide (LPS), a fragment of the bacterial cell wall, specifically interacting with protein complexes on the cell surface, can induce the production of pro-inflammatory and apoptotic signaling molecules, leading to the damage and death of brain cells. Similar effects have been noted in stroke and traumatic brain injury, when the leading factor of death is glutamate (Glu) excitotoxicity too. But being an amphiphilic molecule with a significant hydrophobic moiety and a large hydrophilic region, LPS can also non-specifically bind to the plasma membrane, altering its properties. In the present work, we studied the effect of LPS from Escherichia coli alone and in combination with the hyperstimulation of Glu-receptors on the functional state of mitochondria and Ca2+ homeostasis, oxygen consumption and the cell survival in primary cultures from the rats brain cerebellum and cortex. In both types of cultures, LPS (0.1–10 μg/ml) did not change the intracellular free Ca2+ concentration ([Ca2+]i) in resting neurons but slowed down the median of the decrease in [Ca2+]i on 14% and recovery of the mitochondrial potential (ΔΨm) after Glu removal. LPS did not affect the basal oxygen consumption rate (OCR) of cortical neurons; however, it did decrease the acute OCR during Glu and LPS coapplication. Evaluation of the cell culture survival using vital dyes and the MTT assay showed that LPS (10 μg/ml) and Glu (33 μM) reduced jointly and separately the proportion of live cortical neurons, but there was no synergism or additive action. LPS-effects was dependent on the type of culture, that may be related to both the properties of neurons and the different ratio between neurons and glial cells in cultures. The rapid manifestation of these effects may be the consequence of the direct effect of LPS on the rheological properties of the cell membrane.
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Affiliation(s)
- Zanda Bakaeva
- Laboratory of Neurobiology, “National Medical Research Center of Children’s Health”, Russian Ministry of Health, Moscow, Russia
- Department of General Biology and Physiology, Kalmyk State University named after B.B. Gorodovikov, Elista, Russia
- *Correspondence: Zanda Bakaeva, ,
| | - Natalia Lizunova
- Laboratory of Neurobiology, “National Medical Research Center of Children’s Health”, Russian Ministry of Health, Moscow, Russia
- Department of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Ivan Tarzhanov
- Laboratory of Neurobiology, “National Medical Research Center of Children’s Health”, Russian Ministry of Health, Moscow, Russia
- Institute of Pharmacy, The Sechenov First Moscow State Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - Dmitrii Boyarkin
- Laboratory of Neurobiology, “National Medical Research Center of Children’s Health”, Russian Ministry of Health, Moscow, Russia
| | - Svetlana Petrichuk
- Laboratory of Neurobiology, “National Medical Research Center of Children’s Health”, Russian Ministry of Health, Moscow, Russia
| | - Vsevolod Pinelis
- Laboratory of Neurobiology, “National Medical Research Center of Children’s Health”, Russian Ministry of Health, Moscow, Russia
| | - Andrey Fisenko
- Laboratory of Neurobiology, “National Medical Research Center of Children’s Health”, Russian Ministry of Health, Moscow, Russia
| | - Alexander Tuzikov
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Rinat Sharipov
- Laboratory of Fundamental and Applied Problems of Pain, Institute of General Pathology and Pathophysiology, Moscow, Russia
| | - Alexander Surin
- Laboratory of Neurobiology, “National Medical Research Center of Children’s Health”, Russian Ministry of Health, Moscow, Russia
- Laboratory of Fundamental and Applied Problems of Pain, Institute of General Pathology and Pathophysiology, Moscow, Russia
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18
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Valdebenito GE, Duchen MR. Monitoring Mitochondrial Membrane Potential in Live Cells Using Time-Lapse Fluorescence Imaging. Methods Mol Biol 2022; 2497:319-324. [PMID: 35771453 DOI: 10.1007/978-1-0716-2309-1_22] [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] [Indexed: 01/14/2023]
Abstract
The mitochondrial membrane potential (ΔΨm) generated by proton pumps (Complexes I, III, and IV) is an essential component in the process of energy generation during oxidative phosphorylation. Tetramethylrhodamine, methyl ester, perchlorate (TMRM) is one of the most commonly used fluorescent reporters of ΔΨm. TMRM is routinely employed in a steady state for the measurement of membrane potential. However, it can also be utilized with time-lapse fluorescence imaging to effectively monitor the changes in membrane potential in response to a given stimulus by analyzing the change in distribution of the dye with time.
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Affiliation(s)
| | - Michael R Duchen
- Department of Cell and Developmental Biology and Consortium for Mitochondrial Research, UCL, London, UK.
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19
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Chi H, Bhosale G, Duchen MR. Assessing the Redox Status of Mitochondria Through the NADH/FAD 2+ Ratio in Intact Cells. Methods Mol Biol 2022; 2497:313-318. [PMID: 35771452 DOI: 10.1007/978-1-0716-2309-1_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
This section aims to describe the measurement of NADH and FAD2+ levels in intact cells using fluorescence microscopy. Both NADH and FADH2 are major electron donors for the electron transport chain through shifting of their redox status. Furthermore, within their redox couples, only NADH and FAD2+ are fluorescent. Therefore, calibration of the NADH and FAD2+ fluorescence signal is a crucial factor in accurately assessing mitochondrial function and redox status.
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Affiliation(s)
- Haoyu Chi
- Department of Cell and Developmental Biology and Consortium for Mitochondrial Research, UCL, London, UK
| | - Gauri Bhosale
- Department of Cell and Developmental Biology and Consortium for Mitochondrial Research, UCL, London, UK
| | - Michael R Duchen
- Department of Cell and Developmental Biology and Consortium for Mitochondrial Research, UCL, London, UK.
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20
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Escoll P, Platon L, Dramé M, Sahr T, Schmidt S, Rusniok C, Buchrieser C. Reverting the mode of action of the mitochondrial F OF 1-ATPase by Legionella pneumophila preserves its replication niche. eLife 2021; 10:e71978. [PMID: 34882089 PMCID: PMC8718111 DOI: 10.7554/elife.71978] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 12/06/2021] [Indexed: 01/17/2023] Open
Abstract
Legionella pneumophila, the causative agent of Legionnaires' disease, a severe pneumonia, injects via a type 4 secretion system (T4SS) more than 300 proteins into macrophages, its main host cell in humans. Certain of these proteins are implicated in reprogramming the metabolism of infected cells by reducing mitochondrial oxidative phosphorylation (OXPHOS) early after infection. Here. we show that despite reduced OXPHOS, the mitochondrial membrane potential (Δψm) is maintained during infection of primary human monocyte-derived macrophages (hMDMs). We reveal that L. pneumophila reverses the ATP-synthase activity of the mitochondrial FOF1-ATPase to ATP-hydrolase activity in a T4SS-dependent manner, which leads to a conservation of the Δψm, preserves mitochondrial polarization, and prevents macrophage cell death. Analyses of T4SS effectors known to target mitochondrial functions revealed that LpSpl is partially involved in conserving the Δψm, but not LncP and MitF. The inhibition of the L. pneumophila-induced 'reverse mode' of the FOF1-ATPase collapsed the Δψm and caused cell death in infected cells. Single-cell analyses suggested that bacterial replication occurs preferentially in hMDMs that conserved the Δψm and showed delayed cell death. This direct manipulation of the mode of activity of the FOF1-ATPase is a newly identified feature of L. pneumophila allowing to delay host cell death and thereby to preserve the bacterial replication niche during infection.
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Affiliation(s)
- Pedro Escoll
- Institut Pasteur, Biologie des Bactéries Intracellulaires and CNRS UMR 3525ParisFrance
| | - Lucien Platon
- Institut Pasteur, Biologie des Bactéries Intracellulaires and CNRS UMR 3525ParisFrance
- Faculté des Sciences, Université de MontpellierMontpellierFrance
| | - Mariatou Dramé
- Institut Pasteur, Biologie des Bactéries Intracellulaires and CNRS UMR 3525ParisFrance
- Faculté des Sciences, Université de ParisParisFrance
| | - Tobias Sahr
- Institut Pasteur, Biologie des Bactéries Intracellulaires and CNRS UMR 3525ParisFrance
| | - Silke Schmidt
- Institut Pasteur, Biologie des Bactéries Intracellulaires and CNRS UMR 3525ParisFrance
- Sorbonne Université, Collège doctoralParisFrance
| | - Christophe Rusniok
- Institut Pasteur, Biologie des Bactéries Intracellulaires and CNRS UMR 3525ParisFrance
| | - Carmen Buchrieser
- Institut Pasteur, Biologie des Bactéries Intracellulaires and CNRS UMR 3525ParisFrance
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21
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Hsp90 Inhibition: A Promising Therapeutic Approach for ARSACS. Int J Mol Sci 2021; 22:ijms222111722. [PMID: 34769152 PMCID: PMC8584178 DOI: 10.3390/ijms222111722] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 10/11/2021] [Accepted: 10/19/2021] [Indexed: 12/30/2022] Open
Abstract
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is a neurodegenerative disease caused by mutations in the SACS gene, encoding the 520 kDa modular protein sacsin, which comprises multiple functional sequence domains that suggest a role either as a scaffold in protein folding or in proteostasis. Cells from patients with ARSACS display a distinct phenotype including altered organisation of the intermediate filament cytoskeleton and a hyperfused mitochondrial network where mitochondrial respiration is compromised. Here, we used vimentin bundling as a biomarker of sacsin function to test the therapeutic potential of Hsp90 inhibition with the C-terminal-domain-targeted compound KU-32, which has demonstrated mitochondrial activity. This study shows that ARSACS patient cells have significantly increased vimentin bundling compared to control, and this was also present in ARSACS carriers despite them being asymptomatic. We found that KU-32 treatment significantly reduced vimentin bundling in carrier and patient cells. We also found that cells from patients with ARSACS were unable to maintain mitochondrial membrane potential upon challenge with mitotoxins, and that the electron transport chain function was restored upon KU-32 treatment. Our preliminary findings presented here suggest that targeting the heat-shock response by Hsp90 inhibition alleviates vimentin bundling and may represent a promising area for the development of therapeutics for ARSACS.
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22
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Ngo J, Osto C, Villalobos F, Shirihai OS. Mitochondrial Heterogeneity in Metabolic Diseases. BIOLOGY 2021; 10:biology10090927. [PMID: 34571805 PMCID: PMC8470264 DOI: 10.3390/biology10090927] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 09/03/2021] [Accepted: 09/08/2021] [Indexed: 11/16/2022]
Abstract
Simple Summary Often times mitochondria within a single cell are depicted as homogenous entities both morphologically and functionally. In normal and diseased states, mitochondria are heterogeneous and display distinct functional properties. In both cases, mitochondria exhibit differences in morphology, membrane potential, and mitochondrial calcium levels. However, the degree of heterogeneity is different during disease; or rather, heterogeneity at the physiological state stems from physically distinct mitochondrial subpopulations. Overall, mitochondrial heterogeneity is both beneficial and detrimental to the cellular system; protective in enabling cellular adaptation to biological stress or detrimental in inhibiting protective mechanisms. Abstract Mitochondria have distinct architectural features and biochemical functions consistent with cell-specific bioenergetic needs. However, as imaging and isolation techniques advance, heterogeneity amongst mitochondria has been observed to occur within the same cell. Moreover, mitochondrial heterogeneity is associated with functional differences in metabolic signaling, fuel utilization, and triglyceride synthesis. These phenotypic associations suggest that mitochondrial subpopulations and heterogeneity influence the risk of metabolic diseases. This review examines the current literature regarding mitochondrial heterogeneity in the pancreatic beta-cell and renal proximal tubules as they exist in the pathological and physiological states; specifically, pathological states of glucolipotoxicity, progression of type 2 diabetes, and kidney diseases. Emphasis will be placed on the benefits of balancing mitochondrial heterogeneity and how the disruption of balancing heterogeneity leads to impaired tissue function and disease onset.
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Affiliation(s)
- Jennifer Ngo
- Department of Medicine, Division of Endocrinology, David Geffen School of Medicine at UCLA, 650 Charles E. Young Drive East, Los Angeles, CA 90095, USA; (J.N.); (C.O.); (F.V.)
- Department of Chemistry and Biochemistry, University of California, 607 Charles E. Young Drive East, Los Angeles, CA 90095, USA
- Metabolism Theme, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
| | - Corey Osto
- Department of Medicine, Division of Endocrinology, David Geffen School of Medicine at UCLA, 650 Charles E. Young Drive East, Los Angeles, CA 90095, USA; (J.N.); (C.O.); (F.V.)
- Metabolism Theme, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, 650 Charles E. Young Drive East, Los Angeles, CA 90095, USA
| | - Frankie Villalobos
- Department of Medicine, Division of Endocrinology, David Geffen School of Medicine at UCLA, 650 Charles E. Young Drive East, Los Angeles, CA 90095, USA; (J.N.); (C.O.); (F.V.)
- Department of Integrative Biology and Physiology, University of California, Los Angeles, CA 90095, USA
| | - Orian S. Shirihai
- Department of Medicine, Division of Endocrinology, David Geffen School of Medicine at UCLA, 650 Charles E. Young Drive East, Los Angeles, CA 90095, USA; (J.N.); (C.O.); (F.V.)
- Metabolism Theme, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, 650 Charles E. Young Drive East, Los Angeles, CA 90095, USA
- Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA
- Correspondence:
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23
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Shahini A, Rajabian N, Choudhury D, Shahini S, Vydiam K, Nguyen T, Kulczyk J, Santarelli T, Ikhapoh I, Zhang Y, Wang J, Liu S, Stablewski A, Thiyagarajan R, Seldeen K, Troen BR, Peirick J, Lei P, Andreadis ST. Ameliorating the hallmarks of cellular senescence in skeletal muscle myogenic progenitors in vitro and in vivo. SCIENCE ADVANCES 2021; 7:eabe5671. [PMID: 34516892 PMCID: PMC8442867 DOI: 10.1126/sciadv.abe5671] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 07/15/2021] [Indexed: 06/13/2023]
Abstract
Senescence of myogenic progenitors impedes skeletal muscle regeneration. Here, we show that overexpression of the transcription factor NANOG in senescent myoblasts can overcome the effects of cellular senescence and confer a youthful phenotype to senescent cells. NANOG ameliorated primary hallmarks of cellular senescence including genomic instability, loss of proteostasis, and mitochondrial dysfunction. The rejuvenating effects of NANOG included restoration of DNA damage response via up-regulation of DNA repair proteins, recovery of heterochromatin marks via up-regulation of histones, and reactivation of autophagy and mitochondrial energetics via up-regulation of AMP-activated protein kinase (AMPK). Expression of NANOG in the skeletal muscle of a mouse model of premature aging restored the number of myogenic progenitors and induced formation of eMyHC+ myofibers. This work demonstrates the feasibility of reversing the effects of cellular senescence in vitro and in vivo, with no need for reprogramming to the pluripotent state.
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Affiliation(s)
- Aref Shahini
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Nika Rajabian
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Debanik Choudhury
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Shahryar Shahini
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Kalyan Vydiam
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Thy Nguyen
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Joseph Kulczyk
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Tyler Santarelli
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Izuagie Ikhapoh
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Yali Zhang
- Department of Biostatistics and Bioinformatics, Roswell Park Cancer Institute, Buffalo, NY 14260, USA
| | - Jianmin Wang
- Department of Biostatistics and Bioinformatics, Roswell Park Cancer Institute, Buffalo, NY 14260, USA
| | - Song Liu
- Department of Biostatistics and Bioinformatics, Roswell Park Cancer Institute, Buffalo, NY 14260, USA
| | - Aimee Stablewski
- Gene Targeting and Transgenic Shared Resource, Roswell Park Comprehensive Cancer Center
| | - Ramkumar Thiyagarajan
- Department of Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Kenneth Seldeen
- Department of Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Bruce R. Troen
- Department of Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
- Research Service, VA Western New York Healthcare System, Buffalo, NY 14260, USA
| | - Jennifer Peirick
- Laboratory Animal Facilities, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Pedro Lei
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Stelios T. Andreadis
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
- Center of Excellence in Bioinformatics and Life Sciences, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
- Center for Cell Gene and Tissue Engineering (CGTE), University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
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24
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El Manaa W, Duplan E, Goiran T, Lauritzen I, Vaillant Beuchot L, Lacas-Gervais S, Morais VA, You H, Qi L, Salazar M, Ozcan U, Chami M, Checler F, Alves da Costa C. Transcription- and phosphorylation-dependent control of a functional interplay between XBP1s and PINK1 governs mitophagy and potentially impacts Parkinson disease pathophysiology. Autophagy 2021; 17:4363-4385. [PMID: 34030589 PMCID: PMC8726674 DOI: 10.1080/15548627.2021.1917129] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Parkinson disease (PD)-affected brains show consistent endoplasmic reticulum (ER) stress and mitophagic dysfunctions. The mechanisms underlying these perturbations and how they are directly linked remain a matter of questions. XBP1 is a transcription factor activated upon ER stress after unconventional splicing by the nuclease ERN1/IREα thereby yielding XBP1s, whereas PINK1 is a kinase considered as the sensor of mitochondrial physiology and a master gatekeeper of mitophagy process. We showed that XBP1s transactivates PINK1 in human cells, primary cultured neurons and mice brain, and triggered a pro-mitophagic phenotype that was fully dependent of endogenous PINK1. We also unraveled a PINK1-dependent phosphorylation of XBP1s that conditioned its nuclear localization and thereby, governed its transcriptional activity. PINK1-induced XBP1s phosphorylation occurred at residues reminiscent of, and correlated to, those phosphorylated in substantia nigra of sporadic PD-affected brains. Overall, our study delineated a functional loop between XBP1s and PINK1 governing mitophagy that was disrupted in PD condition.Abbreviations: 6OHDA: 6-hydroxydopamine; baf: bafilomycin A1; BECN1: beclin 1; CALCOCO2/NDP52: calcium binding and coiled-coil domain 2; CASP3: caspase 3; CCCP: carbonyl cyanide chlorophenylhydrazone; COX8A: cytochrome c oxidase subunit 8A; DDIT3/CHOP: DNA damage inducible transcript 3; EGFP: enhanced green fluorescent protein; ER: endoplasmic reticulum; ERN1/IRE1α: endoplasmic reticulum to nucleus signaling 1; FACS: fluorescence-activated cell sorting; HSPD1/HSP60: heat shock protein family D (Hsp60) member 1; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; MFN2: mitofusin 2; OPTN: optineurin; PD: Parkinson disease; PINK1: PTEN-induced kinase 1; PCR: polymerase chain reaction:; PRKN: parkin RBR E3 ubiquitin protein ligase; XBP1s [p-S61A]: XBP1s phosphorylated at serine 61; XBP1s [p-T48A]: XBP1s phosphorylated at threonine 48; shRNA: short hairpin RNA, SQSTM1/p62: sequestosome 1; TIMM23: translocase of inner mitochondrial membrane 23; TM: tunicamycin; TMRM: tetramethyl rhodamine methylester; TOMM20: translocase of outer mitochondrial membrane 20; Toy: toyocamycin; TP: thapsigargin; UB: ubiquitin; UB (S65): ubiquitin phosphorylated at serine 65; UPR: unfolded protein response, XBP1: X-box binding protein 1; XBP1s: spliced X-box binding protein 1.
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Affiliation(s)
- Wejdane El Manaa
- INSERM, CNRS, IPMC, Team Labeled "Laboratory of Excellence (LABEX) Distalz", Sophia-Antipolis, Université Côte d'Azur, Valbonne, France
| | - Eric Duplan
- INSERM, CNRS, IPMC, Team Labeled "Laboratory of Excellence (LABEX) Distalz", Sophia-Antipolis, Université Côte d'Azur, Valbonne, France
| | - Thomas Goiran
- INSERM, CNRS, IPMC, Team Labeled "Laboratory of Excellence (LABEX) Distalz", Sophia-Antipolis, Université Côte d'Azur, Valbonne, France
| | - Inger Lauritzen
- INSERM, CNRS, IPMC, Team Labeled "Laboratory of Excellence (LABEX) Distalz", Sophia-Antipolis, Université Côte d'Azur, Valbonne, France
| | - Loan Vaillant Beuchot
- INSERM, CNRS, IPMC, Team Labeled "Laboratory of Excellence (LABEX) Distalz", Sophia-Antipolis, Université Côte d'Azur, Valbonne, France
| | | | - Vanessa Alexandra Morais
- Instituto de Medicina Molecular - João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - Han You
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, Fujian, China
| | - Ling Qi
- Division of Metabolism, Endocrinology & Diabetes, University of Michigan, Ann Arbor, NY, USA
| | - Mario Salazar
- Division of Endocrinology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Umut Ozcan
- Division of Endocrinology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Mounia Chami
- INSERM, CNRS, IPMC, Team Labeled "Laboratory of Excellence (LABEX) Distalz", Sophia-Antipolis, Université Côte d'Azur, Valbonne, France
| | - Frédéric Checler
- INSERM, CNRS, IPMC, Team Labeled "Laboratory of Excellence (LABEX) Distalz", Sophia-Antipolis, Université Côte d'Azur, Valbonne, France
| | - Cristine Alves da Costa
- INSERM, CNRS, IPMC, Team Labeled "Laboratory of Excellence (LABEX) Distalz", Sophia-Antipolis, Université Côte d'Azur, Valbonne, France
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25
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Polarized mitochondria as guardians of NK cell fitness. Blood Adv 2021; 5:26-38. [PMID: 33570622 DOI: 10.1182/bloodadvances.2020003458] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 11/24/2020] [Indexed: 01/22/2023] Open
Abstract
Distinct metabolic demands accompany lymphocyte differentiation into short-lived effector and long-lived memory cells. How bioenergetics processes are structured in innate natural killer (NK) cells remains unclear. We demonstrate that circulating human CD56Dim (NKDim) cells have fused mitochondria and enhanced metabolism compared with CD56Br (NKBr) cells. Upon activation, these 2 subsets showed a dichotomous response, with further mitochondrial potentiation in NKBr cells vs paradoxical mitochondrial fission and depolarization in NKDim cells. The latter effect impaired interferon-γ production, but rescue was possible by inhibiting mitochondrial fragmentation, implicating mitochondrial polarization as a central regulator of NK cell function. NKDim cells are heterogeneous, and mitochondrial polarization was associated with enhanced survival and function in mature NKDim cells, including memory-like human cytomegalovirus-dependent CD57+NKG2C+ subsets. In contrast, patients with genetic defects in mitochondrial fusion had a deficiency in adaptive NK cells, which had poor survival in culture. These results support mitochondrial polarization as a central regulator of mature NK cell fitness.
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26
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Kell DB. A protet-based, protonic charge transfer model of energy coupling in oxidative and photosynthetic phosphorylation. Adv Microb Physiol 2021; 78:1-177. [PMID: 34147184 DOI: 10.1016/bs.ampbs.2021.01.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Textbooks of biochemistry will explain that the otherwise endergonic reactions of ATP synthesis can be driven by the exergonic reactions of respiratory electron transport, and that these two half-reactions are catalyzed by protein complexes embedded in the same, closed membrane. These views are correct. The textbooks also state that, according to the chemiosmotic coupling hypothesis, a (or the) kinetically and thermodynamically competent intermediate linking the two half-reactions is the electrochemical difference of protons that is in equilibrium with that between the two bulk phases that the coupling membrane serves to separate. This gradient consists of a membrane potential term Δψ and a pH gradient term ΔpH, and is known colloquially as the protonmotive force or pmf. Artificial imposition of a pmf can drive phosphorylation, but only if the pmf exceeds some 150-170mV; to achieve in vivo rates the imposed pmf must reach 200mV. The key question then is 'does the pmf generated by electron transport exceed 200mV, or even 170mV?' The possibly surprising answer, from a great many kinds of experiment and sources of evidence, including direct measurements with microelectrodes, indicates it that it does not. Observable pH changes driven by electron transport are real, and they control various processes; however, compensating ion movements restrict the Δψ component to low values. A protet-based model, that I outline here, can account for all the necessary observations, including all of those inconsistent with chemiosmotic coupling, and provides for a variety of testable hypotheses by which it might be refined.
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Affiliation(s)
- Douglas B Kell
- Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative, Biology, University of Liverpool, Liverpool, United Kingdom; The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Lyngby, Denmark.
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27
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Qiu YH, Zhang TS, Wang XW, Wang MY, Zhao WX, Zhou HM, Zhang CH, Cai ML, Chen XF, Zhao WL, Shao RG. Mitochondria autophagy: a potential target for cancer therapy. J Drug Target 2021; 29:576-591. [PMID: 33554661 DOI: 10.1080/1061186x.2020.1867992] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Mitophagy is a selective form of macroautophagy in which dysfunctional and damaged mitochondria can be efficiently degraded, removed and recycled through autophagy. Selective removal of damaged or fragmented mitochondria is critical to the functional integrity of the entire mitochondrial network and cells. In past decades, numerous studies have shown that mitophagy is involved in various diseases; however, since the dual role of mitophagy in tumour development, mitophagy role in tumour is controversial, and further elucidation is needed. That is, although mitophagy has been demonstrated to contribute to carcinogenesis, cell migration, ferroptosis inhibition, cancer stemness maintenance, tumour immune escape, drug resistance, etc. during cancer progression, many research also shows that to promote cancer cell death, mitophagy can be induced physiologically or pharmacologically to maintain normal cellular metabolism and prevent cell stress responses and genome damage by diminishing mitochondrial damage, thus suppressing tumour development accompanying these changes. Signalling pathway-specific molecular mechanisms are currently of great biological significance in the identification of potential therapeutic targets. Here, we review recent progress of molecular pathways mediating mitophagy including both canonical pathways (Parkin/PINK1- and FUNDC1-mediated mitophagy) and noncanonical pathways (FKBP8-, Nrf2-, and DRP1-mediated mitophagy); and the regulation of these pathways, and abovementioned pro-cancer and pro-death roles of mitophagy. Finally, we summarise the role of mitophagy in cancer therapy. Mitophagy can potentially be acted as the target for cancer therapy by promotion or inhibition.
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Affiliation(s)
- Yu-Han Qiu
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Tian-Shu Zhang
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Xiao-Wei Wang
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Meng-Yan Wang
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Wen-Xia Zhao
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Hui-Min Zhou
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Cong-Hui Zhang
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Mei-Lian Cai
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Xiao-Fang Chen
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Wu-Li Zhao
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Rong-Guang Shao
- Key Laboratory of Antibiotic Bioengineering, Ministry of Health, Laboratory of Oncology, Institute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
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28
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The effect of DS16570511, a new inhibitor of mitochondrial calcium uniporter, on calcium homeostasis, metabolism, and functional state of cultured cortical neurons and isolated brain mitochondria. Biochim Biophys Acta Gen Subj 2021; 1865:129847. [PMID: 33453305 DOI: 10.1016/j.bbagen.2021.129847] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 12/20/2020] [Accepted: 01/11/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND Disorders of mitochondrial Ca2+ homeostasis play a key role in the glutamate excitotoxicity of brain neurons. DS16570511 (DS) is a new penetrating inhibitor of mitochondrial Ca2+ uniporter complex (MCUC). The paper examines the effects of DS on the cultivated cortical neurons and isolated mitochondria of the rat brain. METHODS The functions of neurons and mitochondria were examined using fluorescence microscopy, XF24 microplate-based сell respirometry, ion-selective microelectrodes, spectrophotometry, and polarographic technique. RESULTS At the doses of 30 and 45 μM, DS reliably slowed down the onset of glutamate-induced delayed calcium deregulation of neurons and suppressed their death. 30 μM DS caused hyperpolarization of mitochondria of resting neurons, and 45 μM DS temporarily depolarized neuronal mitochondria. It was also demonstrated that 30-60 μM DS stimulated cellular respiration. DS was shown to suppress Ca2+ uptake by isolated brain mitochondria. In addition, DS inhibited ADP-stimulated mitochondrial respiration and ADP-induced decrease in the mitochondrial membrane potential. It was found that DS inhibited the activity of complex II of the respiratory chain. In the presence of Ca2+, high DS concentrations caused a collapse of the mitochondrial membrane potential. CONCLUSIONS The data obtained indicate that, in addition to the inhibition of MCUC, DS affects the main energy-transducing functions of mitochondria. GENERAL SIGNIFICANCE The using DS as a tool for studying MCUC and its functional role in neuronal cells should be done with care, bearing in mind multiple effects of DS, a proper evaluation of which would require multivariate analysis.
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29
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Voronina NA, Lisina OY, Krasilnikova IA, Kucheryanu VG, Kapitsa IG, Voronina TA, Surin AM. Influence of Hemantane on Changes in Ca2+ and Na+ Caused by Activation of NMDA Channels in Cultured Rat Brain Neurons. NEUROCHEM J+ 2021. [DOI: 10.1134/s1819712421010165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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30
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Surace L, Doisne JM, Croft CA, Thaller A, Escoll P, Marie S, Petrosemoli N, Guillemot V, Dardalhon V, Topazio D, Cama A, Buchrieser C, Taylor N, Amit I, Musumeci O, Di Santo JP. Dichotomous metabolic networks govern human ILC2 proliferation and function. Nat Immunol 2021; 22:1367-1374. [PMID: 34686862 PMCID: PMC8553616 DOI: 10.1038/s41590-021-01043-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 09/09/2021] [Indexed: 01/20/2023]
Abstract
Group 2 innate lymphoid cells (ILC2s) represent innate homologs of type 2 helper T cells (TH2) that participate in immune defense and tissue homeostasis through production of type 2 cytokines. While T lymphocytes metabolically adapt to microenvironmental changes, knowledge of human ILC2 metabolism is limited, and its key regulators are unknown. Here, we show that circulating 'naive' ILC2s have an unexpected metabolic profile with a higher level of oxidative phosphorylation (OXPHOS) than natural killer (NK) cells. Accordingly, ILC2s are severely reduced in individuals with mitochondrial disease (MD) and impaired OXPHOS. Metabolomic and nutrient receptor analysis revealed ILC2 uptake of amino acids to sustain OXPHOS at steady state. Following activation with interleukin-33 (IL-33), ILC2s became highly proliferative, relying on glycolysis and mammalian target of rapamycin (mTOR) to produce IL-13 while continuing to fuel OXPHOS with amino acids to maintain cellular fitness and proliferation. Our results suggest that proliferation and function are metabolically uncoupled in human ILC2s, offering new strategies to target ILC2s in disease settings.
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Affiliation(s)
- Laura Surace
- grid.428999.70000 0001 2353 6535Innate Immunity Unit, Institut Pasteur, Inserm U1223, Paris, France
| | - Jean-Marc Doisne
- grid.428999.70000 0001 2353 6535Innate Immunity Unit, Institut Pasteur, Inserm U1223, Paris, France
| | - Carys A. Croft
- grid.428999.70000 0001 2353 6535Innate Immunity Unit, Institut Pasteur, Inserm U1223, Paris, France ,grid.508487.60000 0004 7885 7602Université de Paris, Sorbonne Paris Cité, Paris, France
| | - Anna Thaller
- grid.428999.70000 0001 2353 6535Innate Immunity Unit, Institut Pasteur, Inserm U1223, Paris, France ,grid.508487.60000 0004 7885 7602Université de Paris, Sorbonne Paris Cité, Paris, France
| | - Pedro Escoll
- grid.428999.70000 0001 2353 6535Biology of Intracellular Bacteria Unit, Institut Pasteur, CNRS UMR 3525, Paris, France
| | - Solenne Marie
- grid.428999.70000 0001 2353 6535Innate Immunity Unit, Institut Pasteur, Inserm U1223, Paris, France
| | - Natalia Petrosemoli
- grid.428999.70000 0001 2353 6535Bioinformatics and Biostatistics Hub, Center of Bioinformatics, Biostatistics, and Integrative Biology, Institut Pasteur, Paris, France
| | - Vincent Guillemot
- grid.428999.70000 0001 2353 6535Bioinformatics and Biostatistics Hub, Center of Bioinformatics, Biostatistics, and Integrative Biology, Institut Pasteur, Paris, France
| | - Valerie Dardalhon
- grid.121334.60000 0001 2097 0141Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS, Montpellier, France
| | - Davide Topazio
- Department of Otolaryngology, Hospital ‘Mazzini’, Teramo, Italy
| | - Antonia Cama
- Department of Maxillofacial and Otolaryngology, Hospital ‘F. Renzetti’, Lanciano, Italy
| | - Carmen Buchrieser
- grid.428999.70000 0001 2353 6535Biology of Intracellular Bacteria Unit, Institut Pasteur, CNRS UMR 3525, Paris, France
| | - Naomi Taylor
- grid.121334.60000 0001 2097 0141Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS, Montpellier, France
| | - Ido Amit
- grid.13992.300000 0004 0604 7563Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Olimpia Musumeci
- grid.10438.3e0000 0001 2178 8421Unit of Neurology and Neuromuscular Disorders, Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - James P. Di Santo
- grid.428999.70000 0001 2353 6535Innate Immunity Unit, Institut Pasteur, Inserm U1223, Paris, France
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31
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Vaillant-Beuchot L, Mary A, Pardossi-Piquard R, Bourgeois A, Lauritzen I, Eysert F, Kinoshita PF, Cazareth J, Badot C, Fragaki K, Bussiere R, Martin C, Mary R, Bauer C, Pagnotta S, Paquis-Flucklinger V, Buée-Scherrer V, Buée L, Lacas-Gervais S, Checler F, Chami M. Accumulation of amyloid precursor protein C-terminal fragments triggers mitochondrial structure, function, and mitophagy defects in Alzheimer's disease models and human brains. Acta Neuropathol 2021; 141:39-65. [PMID: 33079262 PMCID: PMC7785558 DOI: 10.1007/s00401-020-02234-7] [Citation(s) in RCA: 110] [Impact Index Per Article: 36.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 09/03/2020] [Accepted: 10/01/2020] [Indexed: 02/07/2023]
Abstract
Several lines of recent evidence indicate that the amyloid precursor protein-derived C-terminal fragments (APP-CTFs) could correspond to an etiological trigger of Alzheimer's disease (AD) pathology. Altered mitochondrial homeostasis is considered an early event in AD development. However, the specific contribution of APP-CTFs to mitochondrial structure, function, and mitophagy defects remains to be established. Here, we demonstrate in neuroblastoma SH-SY5Y cells expressing either APP Swedish mutations, or the β-secretase-derived APP-CTF fragment (C99) combined with β- and γ-secretase inhibition, that APP-CTFs accumulation independently of Aβ triggers excessive mitochondrial morphology alteration (i.e., size alteration and cristae disorganization) associated with enhanced mitochondrial reactive oxygen species production. APP-CTFs accumulation also elicit basal mitophagy failure illustrated by enhanced conversion of LC3, accumulation of LC3-I and/or LC3-II, non-degradation of SQSTM1/p62, inconsistent Parkin and PINK1 recruitment to mitochondria, enhanced levels of membrane and matrix mitochondrial proteins, and deficient fusion of mitochondria with lysosomes. We confirm the contribution of APP-CTFs accumulation to morphological mitochondria alteration and impaired basal mitophagy in vivo in young 3xTgAD transgenic mice treated with γ-secretase inhibitor as well as in adeno-associated-virus-C99 injected mice. Comparison of aged 2xTgAD and 3xTgAD mice indicates that, besides APP-CTFs, an additional contribution of Aβ to late-stage mitophagy activation occurs. Importantly, we report on mitochondrial accumulation of APP-CTFs in human post-mortem sporadic AD brains correlating with mitophagy failure molecular signature. Since defective mitochondria homeostasis plays a pivotal role in AD pathogenesis, targeting mitochondrial dysfunctions and/or mitophagy by counteracting early APP-CTFs accumulation may represent relevant therapeutic interventions in AD.
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Affiliation(s)
- Loan Vaillant-Beuchot
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Arnaud Mary
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Raphaëlle Pardossi-Piquard
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Alexandre Bourgeois
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Inger Lauritzen
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Fanny Eysert
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Paula Fernanda Kinoshita
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
- Department of Pharmacology, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Julie Cazareth
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Céline Badot
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | | | - Renaud Bussiere
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
- Department of Medicine, Burlington Danes Building, Hammersmith Hospital Campus, Imperial College London, UK Dementia Research Institute, Du Cane Road, London, W12 0NN, UK
| | - Cécile Martin
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Rosanna Mary
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Charlotte Bauer
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Sophie Pagnotta
- Université Côte d'Azur, Centre Commun de Microscopie Appliquée (CCMA), Parc Valrose, 06108, Nice, France
| | | | - Valérie Buée-Scherrer
- Univ. Lille, Inserm, CHU-Lille, Lille Neuroscience and Cognition, Place de Verdun, 59045, Lille, France
- Inserm UMR-S 1172, Laboratory of Excellence DistALZ, 'Alzheimer and Tauopathies', Bâtiment Biserte, rue Polonovski, 59045, Lille Cedex, France
| | - Luc Buée
- Univ. Lille, Inserm, CHU-Lille, Lille Neuroscience and Cognition, Place de Verdun, 59045, Lille, France
- Inserm UMR-S 1172, Laboratory of Excellence DistALZ, 'Alzheimer and Tauopathies', Bâtiment Biserte, rue Polonovski, 59045, Lille Cedex, France
| | - Sandra Lacas-Gervais
- Université Côte d'Azur, Centre Commun de Microscopie Appliquée (CCMA), Parc Valrose, 06108, Nice, France
| | - Frédéric Checler
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France
| | - Mounia Chami
- Institut of Molecular and Cellular Pharmacology, Laboratory of Excellence DistALZ, Université Côte d'Azur, INSERM, CNRS, Sophia-Antipolis, 06560, Valbonne, France.
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Strobbe D, Pecorari R, Conte O, Minutolo A, Hendriks CMM, Wiezorek S, Faccenda D, Abeti R, Montesano C, Bolm C, Campanella M. NH-sulfoximine: A novel pharmacological inhibitor of the mitochondrial F 1 F o -ATPase, which suppresses viability of cancerous cells. Br J Pharmacol 2020; 178:298-311. [PMID: 33037618 PMCID: PMC9328437 DOI: 10.1111/bph.15279] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 08/27/2020] [Accepted: 09/02/2020] [Indexed: 12/15/2022] Open
Abstract
Background and Purpose The mitochondrial F1Fo‐ATPsynthase is pivotal for cellular homeostasis. When respiration is perturbed, its mode of action everts becoming an F1Fo‐ATPase and therefore consuming rather producing ATP. Such a reversion is an obvious target for pharmacological intervention to counteract pathologies. Despite this, tools to selectively inhibit the phases of ATP hydrolysis without affecting the production of ATP remain scarce. Here, we report on a newly synthesised chemical, the NH‐sulfoximine (NHS), which achieves such a selectivity. Experimental Approach The chemical structure of the F1Fo‐ATPase inhibitor BTB‐06584 was used as a template to synthesise NHS. We assessed its pharmacology in human neuroblastoma SH‐SY5Y cells in which we profiled ATP levels, redox signalling, autophagy pathways and cellular viability. NHS was given alone or in combination with either the glucose analogue 2‐deoxyglucose (2‐DG) or the chemotherapeutic agent etoposide. Key Results NHS selectively blocks the consumption of ATP by mitochondria leading a subtle cytotoxicity associated via the concomitant engagement of autophagy which impairs cell viability. NHS achieves such a function independently of the F1Fo‐ATPase inhibitory factor 1 (IF1). Conclusion and Implications The novel sulfoximine analogue of BTB‐06584, NHS, acts as a selective pharmacological inhibitor of the mitochondrial F1Fo‐ATPase. NHS, by blocking the hydrolysis of ATP perturbs the bioenergetic homoeostasis of cancer cells, leading to a non‐apoptotic type of cell death.
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Affiliation(s)
- Daniela Strobbe
- Department of Biology, University of Rome "Tor Vergata", Rome, Italy
| | - Rosalba Pecorari
- Department of Biology, University of Rome "Tor Vergata", Rome, Italy
| | - Oriana Conte
- Department of Biology, University of Rome "Tor Vergata", Rome, Italy
| | - Antonella Minutolo
- Department of Cell and Developmental Biology, Consortium for Mitochondrial Research (CfMR), University College London, London, UK
| | | | - Stefan Wiezorek
- Institute of Organic Chemistry, RWTH Aachen University, Aachen, Germany
| | - Danilo Faccenda
- Department of Comparative Biomedical Sciences, The Royal Veterinary College, University of London, London, UK
| | - Rosella Abeti
- Ataxia Centre, Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, Queen Square London, London, WC1N 3BG, UK
| | - Carla Montesano
- Department of Biology, University of Rome "Tor Vergata", Rome, Italy
| | - Carsten Bolm
- Institute of Organic Chemistry, RWTH Aachen University, Aachen, Germany
| | - Michelangelo Campanella
- Department of Comparative Biomedical Sciences, The Royal Veterinary College, University of London, London, UK.,Department of Cell and Developmental Biology, Consortium for Mitochondrial Research (CfMR), University College London, London, UK.,Department of Biology, University of Rome "Tor Vergata", Rome, Italy
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Battaglia CR, Cursano S, Calzia E, Catanese A, Boeckers TM. Corticotropin-releasing hormone (CRH) alters mitochondrial morphology and function by activating the NF-kB-DRP1 axis in hippocampal neurons. Cell Death Dis 2020; 11:1004. [PMID: 33230105 PMCID: PMC7683554 DOI: 10.1038/s41419-020-03204-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 11/01/2020] [Accepted: 11/03/2020] [Indexed: 02/07/2023]
Abstract
Neuronal stress-adaptation combines multiple molecular responses. We have previously reported that thorax trauma induces a transient loss of hippocampal excitatory synapses mediated by the local release of the stress-related hormone corticotropin-releasing hormone (CRH). Since a physiological synaptic activity relies also on mitochondrial functionality, we investigated the direct involvement of mitochondria in the (mal)-adaptive changes induced by the activation of neuronal CRH receptors 1 (CRHR1). We observed, in vivo and in vitro, a significant shift of mitochondrial dynamics towards fission, which correlated with increased swollen mitochondria and aberrant cristae. These morphological changes, which are associated with increased NF-kB activity and nitric oxide concentrations, correlated with a pronounced reduction of mitochondrial activity. However, ATP availability was unaltered, suggesting that neurons maintain a physiological energy metabolism to preserve them from apoptosis under CRH exposure. Our findings demonstrate that stress-induced CRHR1 activation leads to strong, but reversible, modifications of mitochondrial dynamics and morphology. These alterations are accompanied by bioenergetic defects and the reduction of neuronal activity, which are linked to increased intracellular oxidative stress, and to the activation of the NF-kB/c-Abl/DRP1 axis.
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Affiliation(s)
- Chiara R Battaglia
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, Germany.,International Graduate School, Ulm University, Ulm, Germany
| | - Silvia Cursano
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, Germany.,International Graduate School, Ulm University, Ulm, Germany
| | - Enrico Calzia
- Institute for Anesthesiologic Pathophysiology and Process Engineering, Ulm University, Ulm, Germany
| | - Alberto Catanese
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, Germany.
| | - Tobias M Boeckers
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, Germany. .,DZNE, Ulm site, Ulm, Germany.
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34
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Pelletier-Galarneau M, Petibon Y, Ma C, Han P, Kim SJW, Detmer FJ, Yokell D, Guehl N, Normandin M, El Fakhri G, Alpert NM. In vivo quantitative mapping of human mitochondrial cardiac membrane potential: a feasibility study. Eur J Nucl Med Mol Imaging 2020; 48:414-420. [PMID: 32719915 DOI: 10.1007/s00259-020-04878-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 05/19/2020] [Indexed: 12/30/2022]
Abstract
PURPOSE Alteration in mitochondrial membrane potential (ΔΨm) is an important feature of many pathologic processes, including heart failure, cardiotoxicity, ventricular arrhythmia, and myocardial hypertrophy. We present the first in vivo, non-invasive, assessment of regional ΔΨm in the myocardium of normal human subjects. METHODS Thirteen healthy subjects were imaged using [18F]-triphenylphosphonium ([18F]TPP+) on a PET/MR scanner. The imaging protocol consisted of a bolus injection of 300 MBq followed by a 120-min infusion of 0.6 MBq/min. A 60 min, dynamic PET acquisition was started 1 h after bolus injection. The extracellular space fraction (fECS) was simultaneously measured using MR T1-mapping images acquired at baseline and 15 min after gadolinium injection with correction for the subject's hematocrit level. Serial venous blood samples were obtained to calculate the plasma tracer concentration. The tissue membrane potential (ΔΨT), a proxy of ΔΨm, was calculated from the myocardial tracer concentration at secular equilibrium, blood concentration, and fECS measurements using a model based on the Nernst equation. RESULTS In 13 healthy subjects, average tissue membrane potential (ΔΨT), representing the sum of cellular membrane potential (ΔΨc) and ΔΨm, was - 160.7 ± 3.7 mV, in excellent agreement with previous in vitro assessment. CONCLUSION In vivo quantification of the mitochondrial function has the potential to provide new diagnostic and prognostic information for several cardiac diseases as well as allowing therapy monitoring. This feasibility study lays the foundation for further investigations to assess these potential roles. Clinical trial identifier: NCT03265431.
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Affiliation(s)
- Matthieu Pelletier-Galarneau
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA
| | - Yoann Petibon
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA
| | - Chao Ma
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA
| | - Paul Han
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA
| | - Sally Ji Who Kim
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA
| | - Felicitas J Detmer
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA
| | - Daniel Yokell
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA
| | - Nicolas Guehl
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA
| | - Marc Normandin
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA
| | - Georges El Fakhri
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA.
| | - Nathaniel M Alpert
- Department of Radiology, Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, 125 Nashua Street, #6604, Boston, MA, 02114, USA.
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Stryhn JKG, Larsen J, Pedersen PL, Feldthusen AD, Kvetny J, Gæde PH. Mitochondrial energetics and contents evaluated by flow cytometry in human maternal and umbilical cord blood. Scandinavian Journal of Clinical and Laboratory Investigation 2020; 80:351-359. [PMID: 32468866 DOI: 10.1080/00365513.2020.1768584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Background: Mitochondrial dysfunction may relate to metabolic disorders. The relation between maternal and fetal mitochondrial function needs attention due to heritage.Objectives: To evaluate the use of the staining methods TetraMethylRhodamine Methyl Ester (TMRM) and Mitotracker Green (MTG) for flow cytometric measurements of umbilical cord blood mitochondrial function. Methods: 53 euthyroid at-term pregnant women and their offspring were included by blood collections. The offspring had blood drawn from the clamped umbilical cord. Flow cytometry with MTG, TMRM and Propidium Iodide were performed the following day. A cell count (antibody coating and flow cytometry) was performed for 9 maternal and cord samples. As a quality control, blood of 32 healthy donors was evaluated by flow cytometric analyzes same day as sampling and the following day to test stability of the measurements.Results: Cord mitochondrial measurements were lower than maternal. Maternal and cord mitochondrial function were positively correlated, especially reflected by MTG fluorescence-intensity (FI). Samples stored presented with very changed fluorescence patterns. However, the fluorescence intensity ratios MTG/TMRM of stained white blood cells were related within same day measurements, depicting an extensive and common bioenergetic cellular change.Conclusion: Cord blood flow cytometry by MTG- and TMRM- staining is possible with fluorescence intensity positively correlated to maternal fluorescence intensity. Storage of blood triggers mitochondrial dynamics. The methods are applicable with certain reservations, and they benefit from their non-invasive character compared to mitochondrial evaluation by muscle-biopsies.
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Affiliation(s)
- Julie Kristine Guldberg Stryhn
- Department of Gynecology and Obstetrics, Slagelse Hospital, Slagelse, Denmark.,Mitochondria Research Unit, Naestved Hospital, Naestved, Denmark.,Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - Jacob Larsen
- Mitochondria Research Unit, Naestved Hospital, Naestved, Denmark.,Department of Clinical Pathology, University Hospital Roskilde, Roskilde, Denmark
| | - Palle Lyngsie Pedersen
- Mitochondria Research Unit, Naestved Hospital, Naestved, Denmark.,Department of Clinical Biochemistry, Naestved Hospital, Naestved, Denmark
| | | | - Jan Kvetny
- Mitochondria Research Unit, Naestved Hospital, Naestved, Denmark
| | - Peter Haulund Gæde
- Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark.,Department of Internal Medicine, Slagelse Hospital, Slagelse, Denmark
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36
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Ghazi S, Bourgeois S, Gomariz A, Bugarski M, Haenni D, Martins JR, Nombela-Arrieta C, Unwin RJ, Wagner CA, Hall AM, Craigie E. Multiparametric imaging reveals that mitochondria-rich intercalated cells in the kidney collecting duct have a very high glycolytic capacity. FASEB J 2020; 34:8510-8525. [PMID: 32367531 DOI: 10.1096/fj.202000273r] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 03/30/2020] [Accepted: 04/16/2020] [Indexed: 02/06/2023]
Abstract
Alpha intercalated cells (αICs) in the kidney collecting duct (CD) belong to a family of mitochondria rich cells (MRCs) and have a crucial role in acidifying the urine via apical V-ATPase pumps. The nature of metabolism in αICs and its relationship to transport was not well-understood. Here, using multiphoton live cell imaging in mouse kidney tissue, FIB-SEM, and other complementary techniques, we provide new insights into mitochondrial structure and function in αICs. We show that αIC mitochondria have a rounded structure and are not located in close proximity to V-ATPase containing vesicles. They display a bright NAD(P)H fluorescence signal and low uptake of voltage-dependent dyes, but are energized by a pH gradient. However, expression of complex V (ATP synthase) is relatively low in αICs, even when stimulated by metabolic acidosis. In contrast, anaerobic glycolytic capacity is surprisingly high, and sufficient to maintain intracellular calcium homeostasis in the presence of complete aerobic inhibition. Moreover, glycolysis is essential for V-ATPase-mediated proton pumping. Key findings were replicated in narrow/clear cells in the epididymis, also part of the MRC family. In summary, using a range of cutting-edge techniques to investigate αIC metabolism in situ, we have discovered that these mitochondria dense cells have a high glycolytic capacity.
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Affiliation(s)
- Susan Ghazi
- Institute of Anatomy, University of Zurich, Zurich, Switzerland
| | - Soline Bourgeois
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Alvaro Gomariz
- Department of Medical Oncology and Hematology, University of Zurich, Zurich, Switzerland.,Computer Vision Laboratory, ETH Zurich, Zurich, Switzerland
| | - Milica Bugarski
- Institute of Anatomy, University of Zurich, Zurich, Switzerland
| | - Dominik Haenni
- Institute of Anatomy, University of Zurich, Zurich, Switzerland.,Center for Microscopy and Image Analysis, University of Zurich, Zurich, Switzerland
| | - Joana R Martins
- Center for Microscopy and Image Analysis, University of Zurich, Zurich, Switzerland
| | - César Nombela-Arrieta
- Department of Medical Oncology and Hematology, University of Zurich, Zurich, Switzerland
| | - Robert J Unwin
- Department of Renal Medicine, University College London, UK.,AstraZeneca Biopharmaceuticals R&D, Gothenburg, Sweden
| | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Andrew M Hall
- Institute of Anatomy, University of Zurich, Zurich, Switzerland.,Department of Nephrology, University Hospital Zurich, Switzerland
| | - Eilidh Craigie
- Institute of Anatomy, University of Zurich, Zurich, Switzerland
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37
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Plotegher N, Perocheau D, Ferrazza R, Massaro G, Bhosale G, Zambon F, Rahim AA, Guella G, Waddington SN, Szabadkai G, Duchen MR. Impaired cellular bioenergetics caused by GBA1 depletion sensitizes neurons to calcium overload. Cell Death Differ 2020; 27:1588-1603. [PMID: 31685979 PMCID: PMC7206133 DOI: 10.1038/s41418-019-0442-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 10/09/2019] [Accepted: 10/10/2019] [Indexed: 12/19/2022] Open
Abstract
Heterozygous mutations of the lysosomal enzyme glucocerebrosidase (GBA1) represent the major genetic risk for Parkinson's disease (PD), while homozygous GBA1 mutations cause Gaucher disease, a lysosomal storage disorder, which may involve severe neurodegeneration. We have previously demonstrated impaired autophagy and proteasomal degradation pathways and mitochondrial dysfunction in neurons from GBA1 knockout (gba1-/-) mice. We now show that stimulation with physiological glutamate concentrations causes pathological [Ca2+]c responses and delayed calcium deregulation, collapse of mitochondrial membrane potential and an irreversible fall in the ATP/ADP ratio. Mitochondrial Ca2+ uptake was reduced in gba1-/- cells as was expression of the mitochondrial calcium uniporter. The rate of free radical generation was increased in gba1-/- neurons. Behavior of gba1+/- neurons was similar to gba1-/- in terms of all variables, consistent with a contribution of these mechanisms to the pathogenesis of PD. These data signpost reduced bioenergetic capacity and [Ca2+]c dysregulation as mechanisms driving neurodegeneration.
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Affiliation(s)
- Nicoletta Plotegher
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK
- Department of Biology, University of Padua, 35131, Padua, Italy
| | - Dany Perocheau
- Institute for Women's Health, University College London, London, WC1E6HU, UK
| | - Ruggero Ferrazza
- Department of Physics, University of Trento, 38123, Povo (TN), Italy
| | - Giulia Massaro
- School of Pharmacy, University College London, London, WC1N1AX, UK
| | - Gauri Bhosale
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK
| | - Federico Zambon
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK
| | - Ahad A Rahim
- School of Pharmacy, University College London, London, WC1N1AX, UK
| | - Graziano Guella
- Department of Physics, University of Trento, 38123, Povo (TN), Italy
| | - Simon N Waddington
- Institute for Women's Health, University College London, London, WC1E6HU, UK
- MRC Antiviral Gene Therapy Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Gyorgy Szabadkai
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK
- Department of Biomedical Sciences, University of Padua, 35131, Padua, Italy
- The Francis Crick Institute, London, NW1 1AT, UK
| | - Michael R Duchen
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK.
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38
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Yang B, Chen Y, Shi J. Tumor‐Specific Chemotherapy by Nanomedicine‐Enabled Differential Stress Sensitization. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002306] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Bowen Yang
- State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of Sciences Shanghai 200050 P. R. China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Yu Chen
- State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of Sciences Shanghai 200050 P. R. China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Jianlin Shi
- State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of Sciences Shanghai 200050 P. R. China
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Yang B, Chen Y, Shi J. Tumor-Specific Chemotherapy by Nanomedicine-Enabled Differential Stress Sensitization. Angew Chem Int Ed Engl 2020; 59:9693-9701. [PMID: 32162453 DOI: 10.1002/anie.202002306] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 03/09/2020] [Indexed: 12/31/2022]
Abstract
Most of current nanomedicines are administrated intravenously to favour tumor accumulation through enhanced permeability and retention (EPR) effect, which, however, suffers from several drawbacks such as low drug bioavailability and severe side effect. In this work, we have constructed a doxorubicin(Dox)-based liposomal nanosystem for tumor-specific chemotherapy, by enabling differential stress sensitization between cancer and normal cells for restricting the chemodrug toxicity exclusively in tumor regions. 2-Deoxy-D-glucose (2DG) was loaded in the nanoliposome to inhibit glycolysis of cancer cells, which works in synergy with the co-loaded chemodrug Dox to promote mitochondrial depolarization and subsequent apoptosis. In addition, the starvation effect of 2DG can counteract the toxicity of Dox in normal cells and thus mitigates the harmful side effect of chemotherapy. It is expected that such a differential stress sensitization strategy may greatly benefit future nanomedicine design.
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Affiliation(s)
- Bowen Yang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Yu Chen
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jianlin Shi
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
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40
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Audi SH, Cammarata A, Clough AV, Dash RK, Jacobs ER. Quantification of mitochondrial membrane potential in the isolated rat lung using rhodamine 6G. J Appl Physiol (1985) 2020; 128:892-906. [PMID: 32134711 DOI: 10.1152/japplphysiol.00789.2019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Mitochondrial membrane potential (Δψm) plays a key role in vital mitochondrial functions, and its dissipation is a hallmark of mitochondrial dysfunction. The objective of this study was to develop an experimental and computational approach for estimating Δψm in intact rat lungs using the lipophilic fluorescent cationic dye rhodamine 6G (R6G). Rat lungs were excised and connected to a ventilation-perfusion system. The experimental protocol consisted of three single-pass phases, loading, washing, and uncoupling, in which the lungs were perfused with R6G-containing perfusate, fresh R6G-free perfusate, or R6G-free perfusate containing the mitochondrial uncoupler FCCP, respectively. This protocol was carried out with lung perfusate containing verapamil vehicle or verapamil, an inhibitor of the multidrug efflux pump P-glycoprotein (Pgp). Results show that the addition of FCCP resulted in an increase in R6G venous effluent concentration and that this increase was larger in the presence of verapamil than in its absence. A physiologically based pharmacokinetic (PBPK) model for the pulmonary disposition of R6G was developed and used for quantitative interpretation of the kinetic data, including estimating Δψm. The estimated value of Δψm [-144 ± 24 (SD) mV] was not significantly altered by inhibiting Pgp with verapamil and is comparable with that estimated previously in cultured pulmonary endothelial cells. These results demonstrate the utility of the proposed approach for quantifying Δψm in intact functioning lungs. This approach has potential to provide quantitative assessment of the effect of injurious conditions on lung mitochondrial function and to evaluate the impact of therapies that target mitochondria.NEW & NOTEWORTHY A novel experimental and computational approach for estimating mitochondrial membrane potential (Δψm) in intact functioning lungs is presented. The isolated rat lung inlet-outlet concentrations of the fluorescent cationic dye rhodamine 6G were measured and analyzed by using a computational model of its pulmonary disposition to determine Δψm. The approach has the potential to provide quantitative assessment of the effect of injurious conditions and their therapies on lung mitochondrial function.
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Affiliation(s)
- Said H Audi
- Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin.,Clement J. Zablocki Department of Veterans Affairs Medical Center, Milwaukee, Wisconsin.,Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Anthony Cammarata
- Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Anne V Clough
- Clement J. Zablocki Department of Veterans Affairs Medical Center, Milwaukee, Wisconsin.,Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin.,Department of Mathematical and Statistical Sciences, Marquette University, Milwaukee, Wisconsin
| | - Ranjan K Dash
- Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Elizabeth R Jacobs
- Clement J. Zablocki Department of Veterans Affairs Medical Center, Milwaukee, Wisconsin.,Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
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41
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Grebenik EA, Surin AM, Bardakova KN, Demina TS, Minaev NV, Veryasova NN, Artyukhova MA, Krasilnikova IA, Bakaeva ZV, Sorokina EG, Boyarkin DP, Akopova TA, Pinelis VG, Timashev PS. Chitosan-g-oligo(L,L-lactide) copolymer hydrogel for nervous tissue regeneration in glutamate excitotoxicity: in vitro feasibility evaluation. Biomed Mater 2020; 15:015011. [DOI: 10.1088/1748-605x/ab6228] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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42
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Dai Q, Provost MP, Raburn DJ, Price TM. Progesterone Increases Mitochondria Membrane Potential in Non-human Primate Oocytes and Embryos. Reprod Sci 2020; 27:1206-1214. [PMID: 32046426 DOI: 10.1007/s43032-019-00132-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 10/21/2019] [Indexed: 10/25/2022]
Abstract
Mitochondrial activity is critical and correlates with embryo development. The identification of a novel human mitochondrial progesterone receptor (PR-M) that increases cellular respiration brings into question a role for progesterone in oocyte and preimplantation embryo development. Oocytes and embryos were generated from three Rhesus non-human primates (Macaca mulatta) undergoing in vitro fertilization. Immunohistochemical (IHC) staining for the progesterone receptor and mitochondria, RT-PCR with product sequencing for a mitochondrial progesterone receptor, and mitochondrial membrane determination with JC-1 staining were performed. IHC staining with selective antibodies to the progesterone receptor showed non-nuclear staining. Staining was absent in mouse control embryos. RT-PCR with product sequencing demonstrated PR-M transcript in Rhesus oocytes and embryos, which was absent in mouse embryos. Treatment of Rhesus oocytes and embryos with progesterone showed increased mitochondrial membrane potential, which was absent in mouse embryos. Our results support that progesterone increases mitochondrial membrane potential in oocytes and developing embryos. This is likely an in vivo mechanism to support preimplantation embryo development, and brings up the possibility of in vitro manipulation of culture media for optimization of growth.
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Affiliation(s)
- Qunsheng Dai
- Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Duke University, Durham, NC, USA
| | - Meredith P Provost
- Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Duke University, Durham, NC, USA.,, 10610 N Pennsylvania St #101, Indianapolis, IN, 46280, USA
| | - Douglas J Raburn
- Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Duke University, Durham, NC, USA
| | - Thomas M Price
- Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Duke University, Durham, NC, USA.
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43
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Wang Q, Stringer JM, Liu J, Hutt KJ. Evaluation of mitochondria in oocytes following γ-irradiation. Sci Rep 2019; 9:19941. [PMID: 31882895 PMCID: PMC6934861 DOI: 10.1038/s41598-019-56423-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 12/03/2019] [Indexed: 01/04/2023] Open
Abstract
Standard cytotoxic cancer treatments, such as radiation, can damage and deplete the supply of oocytes stored within the ovary, which predisposes females to infertility and premature menopause later in life. The mechanisms by which radiation induces oocyte damage have not been completely elucidated. The objective of this study was to determine if γ-irradiation changes mitochondrial characteristics in oocytes, possibly contributing to a reduction in oocyte number and quality. Immature oocytes were collected from postnatal day (PN) 9–11 C57Bl6 mice 3, 6 and 24 hours after 0.1 Gy γ-irradiation to monitor acute mitochondrial changes. Oocytes were classified as small (>20 µm) or growing (40–60 µm). Mitochondrial membrane potential was lost in 20% and 44% of small oocytes (~20 µm) at 3 and 6 hours after γ-irradiation, respectively, consistent with the induction of apoptosis. However, mitochondrial mass, distribution and membrane potential in the surviving small oocytes were similar to the non-irradiated controls at both time points. At 24 hours after γ-irradiation, all mitochondrial parameters analysed within immature oocytes were similar to untreated controls. Mitochondrial parameters within growing oocytes were also similar to untreated controls. When mice were superovulated more than 3 weeks after γ-irradiation, there was a significant reduction in the number of mature oocytes harvested compared to controls (Control 18 ± 1 vs 0.1 Gy 4 ± 1, n = 6/16 mice, p < 0.05). There was a slight reduction in mitochondrial mass in mature oocytes after γ-irradiation, though mitochondrial localization, mtDNA copy number and ATP levels were similar between groups. In summary, this study shows that γ-irradiation of pre-pubertal mice is associated with loss of mitochondrial membrane potential in a significant proportion of small immature oocytes and a reduction in the number of mature oocytes harvested from adult mice. Furthermore, these results suggest that immature oocytes that survive γ-irradiation and develop through to ovulation contain mitochondria with normal characteristics. Whether the oocytes that survive radiation and eventually undergo meiosis can support fertility remains to be determined.
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Affiliation(s)
- Qiaochu Wang
- Biomedicine Discovery Institute, Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia
| | - Jessica M Stringer
- Biomedicine Discovery Institute, Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia
| | - Jun Liu
- Biomedicine Discovery Institute, Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia
| | - Karla J Hutt
- Biomedicine Discovery Institute, Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia.
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44
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Ji SG, Medvedeva YV, Weiss JH. Zn 2+ entry through the mitochondrial calcium uniporter is a critical contributor to mitochondrial dysfunction and neurodegeneration. Exp Neurol 2019; 325:113161. [PMID: 31881218 DOI: 10.1016/j.expneurol.2019.113161] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 11/19/2019] [Accepted: 12/21/2019] [Indexed: 12/19/2022]
Abstract
Excitotoxic Ca2+ accumulation contributes to ischemic neurodegeneration, and Ca2+ can enter the mitochondria through the mitochondrial calcium uniporter (MCU) to promote mitochondrial dysfunction. Yet, Ca2+-targeted therapies have met limited success. A growing body of evidence has highlighted the underappreciated importance of Zn2+, which also accumulates in neurons after ischemia and can induce mitochondrial dysfunction and cell death. While studies have indicated that Zn2+ can also enter the mitochondria through the MCU, the specificity of the pore's role in Zn2+-triggered injury is still debated. Present studies use recently available MCU knockout mice to examine how the deletion of this channel impacts deleterious effects of cytosolic Zn2+ loading. In cultured cortical neurons from MCU knockout mice, we find significantly reduced mitochondrial Zn2+ accumulation. Correspondingly, these neurons were protected from both acute and delayed Zn2+-triggered mitochondrial dysfunction, including mitochondrial reactive oxygen species generation, depolarization, swelling and inhibition of respiration. Furthermore, when toxic extramitochondrial effects of Ca2+ entry were moderated, both cultured neurons (exposed to Zn2+) and CA1 neurons of hippocampal slices (subjected to prolonged oxygen glucose deprivation to model ischemia) from MCU knockout mice displayed decreased neurodegeneration. Finally, to examine the therapeutic applicability of these findings, we added an MCU blocker after toxic Zn2+ exposure in wildtype neurons (to induce post-insult MCU blockade). This significantly attenuated the delayed evolution of both mitochondrial dysfunction and neurotoxicity. These data-combining both genetic and pharmacologic tools-support the hypothesis that Zn2+ entry through the MCU is a critical contributor to ischemic neurodegeneration that could be targeted for neuroprotection.
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Affiliation(s)
- Sung G Ji
- Department of Anatomy & Neurobiology, University of California, Irvine, United States of America
| | - Yuliya V Medvedeva
- Department of Neurology, University of California, Irvine, United States of America
| | - John H Weiss
- Department of Anatomy & Neurobiology, University of California, Irvine, United States of America; Department of Neurology, University of California, Irvine, United States of America.
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45
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Pomytkin I, Krasil'nikova I, Bakaeva Z, Surin A, Pinelis V. Excitotoxic glutamate causes neuronal insulin resistance by inhibiting insulin receptor/Akt/mTOR pathway. Mol Brain 2019; 12:112. [PMID: 31856878 PMCID: PMC6923972 DOI: 10.1186/s13041-019-0533-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 12/11/2019] [Indexed: 01/24/2023] Open
Abstract
Aim An impaired biological response to insulin in the brain, known as central insulin resistance, was identified during stroke and traumatic brain injury, for which glutamate excitotoxicity is a common pathogenic factor. The exact molecular link between excitotoxicity and central insulin resistance remains unclear. To explore this issue, the present study aimed to investigate the effects of glutamate-evoked increases in intracellular free Ca2+ concentrations [Ca2+]i and mitochondrial depolarisations, two key factors associated with excitotoxicity, on the insulin-induced activation of the insulin receptor (IR) and components of the Akt/ mammalian target of rapamycin (mTOR) pathway in primary cultures of rat cortical neurons. Methods Changes in [Ca2+]i and mitochondrial inner membrane potentials (ΔΨm) were monitored in rat cultured cortical neurons, using the fluorescent indicators Fura-FF and Rhodamine 123, respectively. The levels of active, phosphorylated signalling molecules associated with the IR/Akt/mTOR pathway were measured with the multiplex fluorescent immunoassay. Results When significant mitochondrial depolarisations occurred due to glutamate-evoked massive influxes of Ca2+ into the cells, insulin induced 48% less activation of the IR (assessed by IR tyrosine phosphorylation, pY1150/1151), 72% less activation of Akt (assessed by Akt serine phosphorylation, pS473), 44% less activation of mTOR (assessed by mTOR pS2448), and 38% less inhibition of glycogen synthase kinase β (GSK3β) (assessed by GSK3β pS9) compared with respective controls. These results suggested that excitotoxic glutamate inhibits signalling via the IR/Akt/mTOR pathway at multiple levels, including the IR, resulting in the development of acute neuronal insulin resistance within minutes, as an early pathological event associated with excitotoxicity.
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Affiliation(s)
- Igor Pomytkin
- Institute of Regenerative Medicine, I.M. Sechenov First Moscow State Medical University, Trubetskaya Street, 8, 119991, Moscow, Russia. .,Scientific Center for Biomedical Technologies, Federal Medical and Biological Agency, 143442 Svetlye Gory, Moscow region, Russia.
| | - Irina Krasil'nikova
- National Medical Research Center for Children's Health, Russian Ministry of Health, Lomonosov's prospect, 2, 119991, Moscow, Russia
| | - Zanda Bakaeva
- National Medical Research Center for Children's Health, Russian Ministry of Health, Lomonosov's prospect, 2, 119991, Moscow, Russia
| | - Alexander Surin
- National Medical Research Center for Children's Health, Russian Ministry of Health, Lomonosov's prospect, 2, 119991, Moscow, Russia.,The Institute of General Pathology and Pathophysiology, Baltiyskaya Street, 8, 125315, Moscow, Russia
| | - Vsevolod Pinelis
- National Medical Research Center for Children's Health, Russian Ministry of Health, Lomonosov's prospect, 2, 119991, Moscow, Russia
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46
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Krasil'nikova I, Surin A, Sorokina E, Fisenko A, Boyarkin D, Balyasin M, Demchenko A, Pomytkin I, Pinelis V. Insulin Protects Cortical Neurons Against Glutamate Excitotoxicity. Front Neurosci 2019; 13:1027. [PMID: 31611766 PMCID: PMC6769071 DOI: 10.3389/fnins.2019.01027] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 09/10/2019] [Indexed: 12/31/2022] Open
Abstract
Glutamate excitotoxicity is implicated in the pathogenesis of numerous diseases, such as stroke, traumatic brain injury, and Alzheimer's disease, for which insulin resistance is a concomitant condition, and intranasal insulin treatment is believed to be a promising therapy. Excitotoxicity is initiated primarily by the sustained stimulation of ionotropic glutamate receptors and leads to a rise in intracellular Ca2+ ([Ca2+] i ), followed by a cascade of intracellular events, such as delayed calcium deregulation (DCD), mitochondrial depolarization, adenosine triphosphate (ATP) depletion that collectively end in cell death. Therefore, cross-talk between insulin and glutamate signaling in excitotoxicity is of particular interest for research. In the present study, we investigated the effects of short-term insulin exposure on the dynamics of [Ca2+] i and mitochondrial potential in cultured rat cortical neurons during glutamate excitotoxicity. We found that insulin ameliorated the glutamate-evoked rise of [Ca2+] i and prevented the onset of DCD, the postulated point-of-no-return in excitotoxicity. Additionally, insulin significantly improved the glutamate-induced drop in mitochondrial potential, ATP depletion, and depletion of brain-derived neurotrophic factor (BDNF), which is a critical neuroprotector in excitotoxicity. Also, insulin improved oxygen consumption rates, maximal respiration, and spare respiratory capacity in neurons exposed to glutamate, as well as the viability of cells in the MTT assay. In conclusion, the short-term insulin exposure in our experiments was evidently a protective treatment against excitotoxicity, in a sharp contrast to chronic insulin exposure causal to neuronal insulin resistance, the adverse factor in excitotoxicity.
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Affiliation(s)
| | - Alexander Surin
- National Medical Research Center for Children's Health, Moscow, Russia.,Institute of General Pathology and Pathophysiology, Russian Academy of Sciences, Moscow, Russia
| | - Elena Sorokina
- National Medical Research Center for Children's Health, Moscow, Russia
| | - Andrei Fisenko
- National Medical Research Center for Children's Health, Moscow, Russia
| | - Dmitry Boyarkin
- National Medical Research Center for Children's Health, Moscow, Russia
| | - Maxim Balyasin
- Department of Advanced Cell Technologies, Institute of Regenerative Medicine, I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | - Anna Demchenko
- Department of Advanced Cell Technologies, Institute of Regenerative Medicine, I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | - Igor Pomytkin
- Department of Advanced Cell Technologies, Institute of Regenerative Medicine, I.M. Sechenov First Moscow State Medical University, Moscow, Russia.,Scientific Center for Biomedical Technologies, Federal Medical and Biological Agency, Svetlye Gory, Moscow, Russia
| | - Vsevolod Pinelis
- National Medical Research Center for Children's Health, Moscow, Russia
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47
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Loukanov A. Two-photon microscopy assessment of the overall energy metabolism alteration of amoeba in hypertonic environment. Microsc Res Tech 2019; 82:1728-1734. [PMID: 31283087 DOI: 10.1002/jemt.23338] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Revised: 05/23/2019] [Accepted: 06/24/2019] [Indexed: 01/20/2023]
Abstract
In this study, a two-photon fluorescence microscopic imaging technique is reported for assessment the effect of dynamic hypertonic environment on the overall energy metabolism alteration and adaptation of soil-living amoeba Dictyostelium discoideum. For that purpose the fluorescence intensity of mitochondrial reduced nicotinamide adenine dinucleotide (NADH) was monitored and quantified in order to evaluate the corresponded metabolic state of monolayer cultured cells. The two-photon excitation of NADH with 720 nm near infrared irradiation produced blue fluorescence emission with maximum wavelength centered at 460 nm. The benefits of reported noninvasive microscopic technique are the significantly less cellular damage and avoiding the excitation of other biomolecules except of NADH. It enabled to acquire data for NADH levels of the observed cells on agar plate specimen and hypertonic nutrition media in a Petri dish. The method demonstrated also good sensitivity, reproducibility and the obtained results revealed that D. discoideum species form aggregation in hypertonic environment within several minutes with aim to survive. The formed aggregate had amorphous shape and it consisted from dozen amoeba cells, which kept their NADH amount in constant level for few hours. The reported imaging method might be applicable in various studies for characterization of metabolic events and assessment of the cell energy balance in hypertonic environment.
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Affiliation(s)
- Alexandre Loukanov
- Division of Strategic Research and Development, Graduate School of Science and Engineering, Saitama University, Saitama, Japan.,Laboratory of Engineering NanoBiotechnology, Department of Engineering Geoecology, University of Mining and Geology "St. Ivan Rilski", Sofia, Bulgaria
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48
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Bhosale G, Duchen MR. Investigating the Mitochondrial Permeability Transition Pore in Disease Phenotypes and Drug Screening. ACTA ACUST UNITED AC 2019; 85:e59. [PMID: 31081999 PMCID: PMC9286464 DOI: 10.1002/cpph.59] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Mitochondria act as ‘sinks’ for Ca2+ signaling, with mitochondrial Ca2+ uptake linking physiological stimuli to increased ATP production. However, mitochondrial Ca2+ overload can induce a cellular catastrophe by opening of the mitochondrial permeability transition pore (mPTP). This pore is a large conductance pathway in the inner mitochondrial membrane that causes bioenergetic collapse and appears to represent a final common path to cell death in many diseases. The role of the mPTP as a determinant of disease outcome is best established in ischemia/reperfusion injury in the heart, brain, and kidney, and it is also implicated in neurodegenerative disorders and muscular dystrophies. As the probability of pore opening can be modulated by drugs, it represents a useful pharmacological target for translational research in drug discovery. Described in this unit is a protocol utilizing isolated mitochondria to quantify this phenomenon and to develop a high‐throughput platform for phenotypic screens for Ca2+ dyshomeostasis. © 2019 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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Affiliation(s)
- Gauri Bhosale
- UCL Consortium for Mitochondrial Research and Department of Cell and Developmental Biology, University College London, London, United Kingdom
| | - Michael R Duchen
- UCL Consortium for Mitochondrial Research and Department of Cell and Developmental Biology, University College London, London, United Kingdom
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49
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Gottwald EM, Duss M, Bugarski M, Haenni D, Schuh CD, Landau EM, Hall AM. The targeted anti-oxidant MitoQ causes mitochondrial swelling and depolarization in kidney tissue. Physiol Rep 2019; 6:e13667. [PMID: 29611340 PMCID: PMC5880956 DOI: 10.14814/phy2.13667] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 03/07/2018] [Indexed: 12/30/2022] Open
Abstract
Kidney proximal tubules (PTs) contain a high density of mitochondria, which are required to generate ATP to power solute transport. Mitochondrial dysfunction is implicated in the pathogenesis of numerous kidney diseases. Damaged mitochondria are thought to produce excess reactive oxygen species (ROS), which can lead to oxidative stress and activation of cell death pathways. MitoQ is a mitochondrial targeted anti‐oxidant that has shown promise in preclinical models of renal diseases. However, recent studies in nonkidney cells have suggested that MitoQ might also have adverse effects. Here, using a live imaging approach, and both in vitro and ex vivo models, we show that MitoQ induces rapid swelling and depolarization of mitochondria in PT cells, but these effects were not observed with SS‐31, another targeted anti‐oxidant. MitoQ consists of a lipophilic cation (Tetraphenylphosphonium [TPP]) joined to an anti‐oxidant component (quinone) by a 10‐carbon alkyl chain, which is thought to insert into the inner mitochondrial membrane (IMM). We found that mitochondrial swelling and depolarization was also induced by dodecyltriphenylphosphomium (DTPP), which consists of TPP and the alkyl chain, but not by TPP alone. Surprisingly, MitoQ‐induced mitochondrial swelling occurred in the absence of a decrease in oxygen consumption rate. We also found that DTPP directly increased the permeability of artificial liposomes with a cardiolipin content similar to that of the IMM. In summary, MitoQ causes mitochondrial swelling and depolarization in PT cells by a mechanism unrelated to anti‐oxidant activity, most likely because of increased IMM permeability due to insertion of the alkyl chain.
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Affiliation(s)
| | - Michael Duss
- Department of Chemistry, University of Zurich, Zurich, Switzerland
| | - Milica Bugarski
- Institute of Anatomy, University of Zurich, Zurich, Switzerland
| | - Dominik Haenni
- Institute of Anatomy, University of Zurich, Zurich, Switzerland.,Center for Microscopy and Image Analysis, University of Zurich, Zurich, Switzerland
| | - Claus D Schuh
- Institute of Anatomy, University of Zurich, Zurich, Switzerland
| | - Ehud M Landau
- Department of Chemistry, University of Zurich, Zurich, Switzerland
| | - Andrew M Hall
- Institute of Anatomy, University of Zurich, Zurich, Switzerland.,Department of Nephrology, University Hospital Zurich, Zurich, Switzerland
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50
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Wakai T, Fissore RA. Constitutive IP 3R1-mediated Ca 2+ release reduces Ca 2+ store content and stimulates mitochondrial metabolism in mouse GV oocytes. J Cell Sci 2019; 132:jcs.225441. [PMID: 30659110 DOI: 10.1242/jcs.225441] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Accepted: 01/02/2019] [Indexed: 12/23/2022] Open
Abstract
In mammals, fertilization initiates Ca2+ oscillations in metaphase II oocytes, which are required for the activation of embryo development. Germinal vesicle (GV) oocytes also display Ca2+ oscillations, although these unfold spontaneously in the absence of any known agonist(s) and their function remains unclear. We found that the main intracellular store of Ca2+ in GV oocytes, the endoplasmic reticulum ([Ca2+]ER), constitutively 'leaks' Ca2+ through the type 1 inositol 1,4,5-trisphosphate receptor. The [Ca2+]ER leak ceases around the resumption of meiosis, the GV breakdown (GVBD) stage, which coincides with the first noticeable accumulation of Ca2+ in the stores. It also concurs with downregulation of the Ca2+ influx and termination of the oscillations, which seemed underpinned by the inactivation of the putative plasma membrane Ca2+ channels. Lastly, we demonstrate that mitochondria take up Ca2+ during the Ca2+ oscillations, mounting their own oscillations that stimulate the mitochondrial redox state and increase the ATP levels of GV oocytes. These distinct features of Ca2+ homeostasis in GV oocytes are likely to underpin the acquisition of both maturation and developmental competence, as well as fulfill stage-specific cellular functions during oocyte maturation.
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Affiliation(s)
- Takuya Wakai
- Department of Veterinary and Animal Sciences, University of Massachusetts Amherst, 661 North Pleasant Street, Amherst, MA 01003, USA
| | - Rafael A Fissore
- Department of Veterinary and Animal Sciences, University of Massachusetts Amherst, 661 North Pleasant Street, Amherst, MA 01003, USA
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