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Tripathi S, Bhawana. Epigenetic Orchestration of Neurodegenerative Disorders: A Possible Target for Curcumin as a Therapeutic. Neurochem Res 2024:10.1007/s11064-024-04167-z. [PMID: 38856890 DOI: 10.1007/s11064-024-04167-z] [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: 01/31/2024] [Revised: 04/23/2024] [Accepted: 05/22/2024] [Indexed: 06/11/2024]
Abstract
Epigenetic modulations play a major role in gene expression and thus are responsible for various physiological changes including age-associated neurological disorders. Neurodegenerative diseases such as Alzheimer's (AD), Parkinson's (PD), Huntington's disease (HD), although symptomatically different, may share common underlying mechanisms. Most neurodegenerative diseases are associated with increased oxidative stress, aggregation of certain proteins, mitochondrial dysfunction, inactivation/dysregulation of protein degradation machinery, DNA damage and cell excitotoxicity. Epigenetic modulations has been reported to play a significant role in onset and progression of neurodegenerative diseases by regulating these processes. Previous studies have highlighted the marked antioxidant and neuroprotective abilities of polyphenols such as curcumin, by increased activity of detoxification systems like superoxide dismutase (SOD), catalase or glutathione peroxidase. The role of curcumin as an epigenetic modulator in neurological disorders and neuroinflammation apart from other chronic diseases have also been reported by a few groups. Nonetheless, the evidences for the role of curcumin mediated epigenetic modulation in its neuroprotective ability are still limited. This review summarizes the current knowledge of the role of mitochondrial dysfunction, epigenetic modulations and mitoepigenetics in age-associated neurological disorders such as PD, AD, HD, Amyotrophic Lateral Sclerosis (ALS), and Multiple Sclerosis (MS), and describes the neuroprotective effects of curcumin in the treatment and/or prevention of these neurodegenerative diseases by regulation of the epigenetic machinery.
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Affiliation(s)
- Shweta Tripathi
- Department of Paramedical Sciences, Faculty of Allied Health Sciences, SGT University, Gurugram, 122505, Haryana, India.
| | - Bhawana
- Department of Paramedical Sciences, Faculty of Allied Health Sciences, SGT University, Gurugram, 122505, Haryana, India
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2
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Vinokurov AY, Pogonyalova MY, Andreeva L, Abramov AY, Angelova PR. Energy substrate supplementation increases ATP levels and is protective to PD neurons. CURRENT RESEARCH IN PHARMACOLOGY AND DRUG DISCOVERY 2024; 6:100187. [PMID: 38841052 PMCID: PMC11150967 DOI: 10.1016/j.crphar.2024.100187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 04/10/2024] [Accepted: 05/22/2024] [Indexed: 06/07/2024] Open
Abstract
Alteration of mitochondrial metabolism by various mutations or toxins leads to various neurological conditions. Age-related changes in energy metabolism could also play the role of a trigger for neurodegenerative disorders. Nonetheless, it is not clear if restoration of ATP production or supplementation of brain cells with substrates for energy production could be neuroprotective. Using primary neurons and astrocytes, and neurons with familial forms of neurodegenerative disorders we studied whether various substrates of energy metabolism could improve mitochondrial metabolism and stimulate ATP production, and whether increased ATP levels could protect cells against glutamate excitotoxicity and neurodegeneration. We found that supplementation of neurons with several substrates, or combination thereof, for the TCA cycle and cellular respiration, and oxidative phosphorylation resulted in an increase in mitochondrial NADH level and in mitochondrial membrane potential and led to an increased level of ATP in neurons and astrocytes. Subsequently, these cells were protected against energy deprivation during ischemia or glutamate excitotoxicity. Provision of substrates for energy metabolism to cells with familial forms of Parkinson's disease also prevented triggering of cell death. Thus, restoration of energy metabolism and increase of ATP production can play neuroprotective role in neurodegeneration. A combination of a succinate salt of choline and nicotinamide provided the best results.
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Affiliation(s)
- Andrey Y. Vinokurov
- Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia
| | | | | | - Andrey Y. Abramov
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, Queen Square, WC1N 3BG, London, UK
| | - Plamena R. Angelova
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, Queen Square, WC1N 3BG, London, UK
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Interdonato L, Marino Y, D'Amico R, Impellizzeri D, Cordaro M, Siracusa R, Gugliandolo E, Franco GA, Fusco R, Cuzzocrea S, Di Paola R. Oxidative stress and mitochondrial dysfunction in brain of vinclozolin exposed animals. Neurochem Int 2024; 174:105681. [PMID: 38341035 DOI: 10.1016/j.neuint.2024.105681] [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: 10/24/2023] [Revised: 01/17/2024] [Accepted: 01/25/2024] [Indexed: 02/12/2024]
Abstract
Vinclozolin (VCZ) is a widely used fungicide in agriculture, especially in fruits and wine. Various studies have detailed the effects of VCZ exposure on different organs, but no information is available on its effects on brain tissues. This paper investigated the effects of VCZ exposure on the oxidative stress and mitochondrial dysfunction in brain tissue. C57BL/6 mice were exposed to VCZ (100 mg/kg) by oral gavage for 28 days. Mitochondrial homeostasis, often known as mitochondrial quality control, involves a range of processes, including mitochondrial biogenesis, mitochondrial fusion and fission, mitophagy and autophagy. VCZ administration modified the mRNA expression levels of Sirt1, Sirt3, PGC-1α, TFAM, Nrf1, VDAC-1 and Cyt c in brain tissue, as compared to control animals (CTR). The analyses also showed increased oxidative stress, in particular VCZ administration reduced SOD and CAT activities and GSH levels while increased T-AOC levels and lipid peroxidation. Additionally, brain tissues from VCZ group showed DNA oxidation (increased PARP-1 immunostaining) and apoptosis (increased TUNEL+ cells, increased expression of Bax mRNA level and reduced Bcl-2 levels). Western blot and immunohistochemical analyses showed increased mitophagic pathway with the accumulation of PINK1 and Parkin in mitochondria. Additionally, autophagic pathway was also increased with the increased expression and colocalization of LC3 with Neun and GFAP. Overall, this study showed that chronic VCZ exposure impaired mitochondrial homeostasis and increased oxidative stress in brain tissues.
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Affiliation(s)
- Livia Interdonato
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy.
| | - Ylenia Marino
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy
| | - Ramona D'Amico
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy.
| | - Daniela Impellizzeri
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy.
| | - Marika Cordaro
- Department of Biomedical, Dental and Morphological and Functional Imaging, University of Messina, 98125 Messina, Italy.
| | - Rosalba Siracusa
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy.
| | - Enrico Gugliandolo
- Department of Veterinary Science, University of Messina, 98168 Messina, Italy.
| | | | - Roberta Fusco
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy.
| | - Salvatore Cuzzocrea
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy.
| | - Rosanna Di Paola
- Department of Veterinary Science, University of Messina, 98168 Messina, Italy.
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Hegazy HA, Abo-ElMatty DM, Farid O, Saleh S, Ghattas MH, Omar NN. Nano-melatonin and-histidine modulate adipokines and neurotransmitters to improve cognition in HFD-fed rats: A formula to study. Biochimie 2023; 207:137-152. [PMID: 36351496 DOI: 10.1016/j.biochi.2022.11.002] [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: 05/03/2022] [Revised: 10/01/2022] [Accepted: 11/02/2022] [Indexed: 11/08/2022]
Abstract
The established correlation between obesity and cognitive impairment portrays pharmacological products aimed at both disorders as an important therapeutic advance. Modulation of dysregulated adipokines and neurotransmitters is hence a critical aspect of the assessment of in-use drugs. At the cellular level, repairments in brain barrier integrity and cognitive flexibility are the main checkpoints. The aim of this study was to investigate whether melatonin and histidine, alone or in combination, could produce weight loss, meanwhile improve the cognitive processes. In this study, obese rat model was established by feeding high fat diet (HFD) composed of 25% fats (soybean oil) for 8 weeks, accompanied by melatonin (10 mg/kg), histidine (780 mg/kg), and combination of both in conventional form and nanoform. At the end of the study, adiposity hormones, neuronal monoamines and amino acids, brain derived neurotrophic factor (BDNF) and zonula occluden-1 (ZO-1) were assessed. HFD feeding resulted in significant weight gain and poor performance on cognitive test. Coadministration of histidine in the nanoform increased the level of ZO-1; an indicator of improving the brain barrier integrity, along with adjusting the adipokines and neurotransmitters levels, which had a positive impact on learning tasks. Cotreatment with melatonin resulted in an increase in the level of BDNF, marking ameliorated synaptic anomalies and learning disabilities, while reducing weight gain. On the other hand, the combination of melatonin and histidine reinstated the synaptic plasticity as well as brain barrier junctions, as demonstrated by increased levels of BDNF and ZO-1, positively affecting weight loss and the intellectual function.
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Affiliation(s)
- Heba Ahmed Hegazy
- Department of Biochemistry, Faculty of Pharmacy, Modern University for Technology and Information, Cairo, Egypt.
| | - Dina M Abo-ElMatty
- Department of Biochemistry, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt.
| | - Omar Farid
- Department of Physiology, National Organization for Drug Control & Research, Giza, Egypt.
| | - Sami Saleh
- Department of Biochemistry, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt.
| | - Maivel H Ghattas
- Department of Medical Biochemistry, Faculty of Medicine, Port Said University, Port Said, Egypt.
| | - Nesreen Nabil Omar
- Department of Biochemistry, Faculty of Pharmacy, Modern University for Technology and Information, Cairo, Egypt.
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Angelova PR, Myers I, Abramov AY. Carbon monoxide neurotoxicity is triggered by oxidative stress induced by ROS production from three distinct cellular sources. Redox Biol 2023; 60:102598. [PMID: 36640724 PMCID: PMC9852609 DOI: 10.1016/j.redox.2022.102598] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 12/30/2022] [Indexed: 01/09/2023] Open
Abstract
Carbon monoxide (CO) poisoning is one of the leading causes of toxic mortality and morbidity. We have studied the generation of reactive oxygen species in cortical neurons in culture in response to toxic doses of CO exposure. Fluorescence microscopy was used to measure the rate of free radical generation, lipid peroxidation, GSH level and also mitochondrial metabolism. We have found that toxic concentrations of CO released from CORM-401 induced mitochondrial depolarisation and inhibition of NADH dependent respiration to a lesser degree than when compared to ischaemia. Energy collapse was not observed within 40 min of CO exposure. We have found that CO induces the generation of reactive oxygen species resulting in lipid peroxidation and a decrease in GSH via three different mechanisms: from mitochondria during the first minutes of CO exposure, from xanthine oxidase at around 20 min exposure due to energy deprivation, and considerable ROS production from NADPH oxidase in the post CO exposure period (re-oxygenation). Inhibition of these different phases with mitochondrial antioxidants, inhibitors of xanthine oxidase, or NADPH oxidase, protected neurons and astrocytes against CO-induced oxidative stress and cell death. The most profound effect was seen during NADPH oxidase inhibition. Thus, oxidative stress has a remarkably significant role in CO-induced neuronal cell death and preventing its occurrence during reoxygenation is of great importance in the consideration of a positive, neurologically protective therapeutic outcome for CO exposed patients.
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Angelova PR, Kerbert AJ, Habtesion A, Hall A, Abramov AY, Jalan R. Hyperammonemia induces mitochondrial dysfunction and neuronal cell death. JHEP REPORTS : INNOVATION IN HEPATOLOGY 2022; 4:100510. [PMID: 35845295 PMCID: PMC9278080 DOI: 10.1016/j.jhepr.2022.100510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 04/21/2022] [Accepted: 05/10/2022] [Indexed: 11/27/2022]
Abstract
Background & Aims In cirrhosis, astrocytic swelling is believed to be the principal mechanism of ammonia neurotoxicity leading to hepatic encephalopathy (HE). The role of neuronal dysfunction in HE is not clear. We aimed to explore the impact of hyperammonaemia on mitochondrial function in primary co-cultures of neurons and astrocytes and in acute brain slices of cirrhotic rats using live cell imaging. Methods To primary cocultures of astrocytes and neurons, low concentrations (1 and 5 μM) of NH4Cl were applied. In rats with bile duct ligation (BDL)-induced cirrhosis, a model known to induce hyperammonaemia and minimal HE, acute brain slices were studied. One group of BDL rats was treated twice daily with the ammonia scavenger ornithine phenylacetate (OP; 0.3 g/kg). Fluorescence measurements of changes in mitochondrial membrane potential (Δψm), cytosolic and mitochondrial reactive oxygen species (ROS) production, lipid peroxidation (LP) rates, and cell viability were performed using confocal microscopy. Results Neuronal cultures treated with NH4Cl exhibited mitochondrial dysfunction, ROS overproduction, and reduced cell viability (27.8 ± 2.3% and 41.5 ± 3.7%, respectively) compared with untreated cultures (15.7 ± 1.0%, both p <0.0001). BDL led to increased cerebral LP (p = 0.0003) and cytosolic ROS generation (p <0.0001), which was restored by OP (both p <0.0001). Mitochondrial function was severely compromised in BDL, resulting in hyperpolarisation of Δψm with consequent overconsumption of adenosine triphosphate and augmentation of mitochondrial ROS production. Administration of OP restored Δψm. In BDL animals, neuronal loss was observed in hippocampal areas, which was partially prevented by OP. Conclusions Our results elucidate that low-grade hyperammonaemia in cirrhosis can severely impact on brain mitochondrial function. Profound neuronal injury was observed in hyperammonaemic conditions, which was partially reversible by OP. This points towards a novel mechanism of HE development. Lay summary The impact of hyperammonaemia, a common finding in patients with liver cirrhosis, on brain mitochondrial function was investigated in this study. The results show that ammonia in concentrations commonly seen in patients induces severe mitochondrial dysfunction, overproduction of damaging oxygen molecules, and profound injury and death of neurons in rat brain cells. These findings point towards a novel mechanism of ammonia-induced brain injury in liver failure and potential novel therapeutic targets. Low concentrations of ammonia induce mitochondrial dysfunction, overproduction of ROS, and cell death in primary neurons. Hyperammonaemia in cirrhotic rats leads to ROS and LP overproduction, which was prevented by the ammonia scavenger OP. In neurons from cirrhotic rats, hyperpolarisation of Δψm was observed, which was restored by OP treatment. In a rat model of cirrhosis, profound neuronal loss was observed in the hippocampus.
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Salimi A, Sabur M, Dadkhah M, Shabani M. Inhibition of scopolamine-induced memory and mitochondrial impairment by betanin. J Biochem Mol Toxicol 2022; 36:e23076. [PMID: 35411685 DOI: 10.1002/jbt.23076] [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: 10/19/2021] [Revised: 02/07/2022] [Accepted: 03/29/2022] [Indexed: 11/05/2022]
Abstract
Mitochondrial dysfunction and oxidative stress are identified to contribute to the mechanisms responsible for the pathogenesis of Alzheimer's disease (AD). Scopolamine (SCO) as a potent drug for inducing memory and learning impairment is associated with mitochondrial dysfunction and oxidative stress. In AD clinical trials molecules with antioxidant properties have shown modest benefit. Betanin as a multifunctional molecule with powerful antioxidative properties may be effective in the treatment of neurodegenerative. Hence, this study was designed to investigate the possible therapeutic effect of betanin against SCO-induced AD on Wistar rats. SCO (1 mg/kg) was administrated intraperitoneally to induce the AD in Wistar rats. The rats were treated with betanin doses (25 mg/kg and 50 mg/kg) intraperitoneally for 9 consecutive days. At the end of the 9th day, the animals were subjected to behavioral examination such as novel object recognition and passive avoidance tests and killed to study the mitochondrial and histological parameters. The results showed attenuation of SCO-induced memory and learning impairment by betanin at 50 mg/kg dose. Also, mitochondrial toxicity parameters such as mitochondrial membrane potential collapse, mitochondrial swelling, decreased activity of succinate dehydrogenase, and reactive oxygen species (ROS) production were reversed by betanin (50 mg/kg) compared to the SCO group. In addition, the ameliorative effect of betanin against SCO was demonstrated in histopathological results of hippocampus. The present investigation established that the betanin ameliorates the SCO-induced memory impairments, tissue injuries, and mitochondrial dysfunction by reducing mitochondrial ROS, which may be due to the potent antioxidant action of betanin.
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Affiliation(s)
- Ahmad Salimi
- Department of Pharmacology and Toxicology, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran.,Traditional Medicine and Hydrotherapy Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Meysam Sabur
- Department of Pharmacology and Toxicology, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran.,Students Research Committee, Faculty of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Masoomeh Dadkhah
- Pharmaceutical Sciences Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Mohammad Shabani
- Department of Pharmacology and Toxicology, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran.,Students Research Committee, Faculty of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran
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8
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Barilani M, Lovejoy C, Piras R, Abramov AY, Lazzari L, Angelova PR. Age-related changes in the energy of human mesenchymal stem cells. J Cell Physiol 2021; 237:1753-1767. [PMID: 34791648 DOI: 10.1002/jcp.30638] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 11/04/2021] [Accepted: 11/08/2021] [Indexed: 01/06/2023]
Abstract
Aging is a physiological process that leads to a higher risk for the most devastating diseases. There are a number of theories of human aging proposed, and many of them are directly or indirectly linked to mitochondria. Here, we used mesenchymal stem cells (MSCs) from young and older donors to study age-related changes in mitochondrial metabolism. We have found that aging in MSCs is associated with a decrease in mitochondrial membrane potential and lower NADH levels in mitochondria. Mitochondrial DNA content is higher in aged MSCs, but the overall mitochondrial mass is decreased due to increased rates of mitophagy. Despite the higher level of ATP in aged cells, a higher rate of ATP consumption renders them more vulnerable to energy deprivation compared to younger cells. Changes in mitochondrial metabolism in aged MSCs activate the overproduction of reactive oxygen species in mitochondria which is compensated by a higher level of the endogenous antioxidant glutathione. Thus, energy metabolism and redox state are the drivers for the aging of MSCs/mesenchymal stromal cells.
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Affiliation(s)
- Mario Barilani
- Department of Transfusion Medicine and Hematology, Laboratory of Regenerative Medicine - Cell Factory, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Christopher Lovejoy
- Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London, UK
| | - Roberta Piras
- Department of Transfusion Medicine and Hematology, Laboratory of Regenerative Medicine - Cell Factory, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Andrey Y Abramov
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK
| | - Lorenza Lazzari
- Department of Transfusion Medicine and Hematology, Laboratory of Regenerative Medicine - Cell Factory, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Plamena R Angelova
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK
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9
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Assessment of Mitochondrial Membrane Potential and NADH Redox State in Acute Brain Slices. Methods Mol Biol 2021; 2276:193-202. [PMID: 34060042 DOI: 10.1007/978-1-0716-1266-8_14] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Brain is one of the most energy-demanding organs. Energy in the form of ATP is produced in brain cells predominantly in oxidative phosphorylation coupled to mitochondrial respiration. Any alteration of the mitochondrial metabolism or prolonged ischemic or anoxic conditions can lead to serious neurological conditions, including neurodegenerative disorders. Assessment of mitochondrial metabolism is important for understanding physiological and pathological processes in the brain. Bioenergetics in central nervous system is dependent on multiple parameters including neuron-glia interactions and considering this, in vivo or ex vivo, the measurements of mitochondrial metabolism should also be complimenting the experiments on isolated mitochondria or cell cultures. To assess the mitochondrial function, there are several key bioenergetic parameters which indicate mitochondrial health. One of the major characteristics of mitochondria is the mitochondrial membrane potential (ΔΨm) which is used as a proton motive force for ATP production and generated by activity of the electron transport chain. Major donor of electrons for the mitochondrial respiratory chain is NADH. Here we demonstrate how to measure mitochondrial NADH/NAD(P)H autofluorescence and ΔΨm in acute brain slices in a time-dependent manner and provide information for the identification of NADH redox index, mitochondrial NADH pool, and the rate of NADH production in the Krebs cycle. Additionally, non-mitochondrial NADH/NADPH autofluorescence can signify the level of activity of the pentose phosphate pathway.
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Sokolovski SG, Rafailov EU, Abramov AY, Angelova PR. Singlet oxygen stimulates mitochondrial bioenergetics in brain cells. Free Radic Biol Med 2021; 163:306-313. [PMID: 33359431 DOI: 10.1016/j.freeradbiomed.2020.12.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 12/08/2020] [Indexed: 12/22/2022]
Abstract
Oxygen, in form of reactive oxygen species (ROS), has been shown to participate in oxidative stress, one of the major triggers for pathology, but also is a main contributor to physiological processes. Recently, it was found that 1267 nm irradiation can produce singlet oxygen without photosensitizers. We used this phenomenon to study the effect of laser-generated singlet oxygen on one of the major oxygen-dependent processes, mitochondrial energy metabolism. We have found that laser-induced generation of 1O2 in neurons and astrocytes led to the increase of mitochondrial membrane potential, activation of NADH- and FADH-dependent respiration, and importantly, increased the rate of maximal respiration in isolated mitochondria. The activation of mitochondrial respiration stimulated production of ATP in these cells. Thus, we found that the singlet oxygen generated by 1267 nm laser pulse works as an activator of mitochondrial respiration and ATP production in the brain.
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Affiliation(s)
| | - Edik U Rafailov
- Aston Institute of Photonics Technologies, Aston University, UK
| | - Andrey Y Abramov
- Department of Clinical and Movement Neurosciences, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK
| | - Plamena R Angelova
- Department of Clinical and Movement Neurosciences, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK.
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11
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Cheng X, Vinokurov AY, Zherebtsov EA, Stelmashchuk OA, Angelova PR, Esteras N, Abramov AY. Variability of mitochondrial energy balance across brain regions. J Neurochem 2020; 157:1234-1243. [PMID: 33190229 DOI: 10.1111/jnc.15239] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/30/2020] [Accepted: 11/04/2020] [Indexed: 12/16/2022]
Abstract
Brain is not homogenous and neurons from various brain regions are known to have different vulnerabilities to mitochondrial mutations and mitochondrial toxins. However, it is not clear if this vulnerability is connected to different energy metabolism in specific brain regions. Here, using live-cell imaging, we compared mitochondrial membrane potential and nicotinamide adenine dinucleotide (NADH) redox balance in acute rat brain slices in different brain regions and further detailed the mitochondrial metabolism in primary neurons and astrocytes from rat cortex, midbrain and cerebellum. We have found that mitochondrial membrane potential is higher in brain slices from the hippocampus and brain stem. In primary co-cultures, mitochondrial membrane potential in astrocytes was lower than in neurons, whereas in midbrain cells it was higher than in cortex and cerebellum. The rate of NADH production and mitochondrial NADH pool were highest in acute slices from midbrain and midbrain primary neurons and astrocytes. Although the level of adenosine tri phosphate (ATP) was similar among primary neurons and astrocytes from cortex, midbrain and cerebellum, the rate of ATP consumption was highest in midbrain cells that lead to faster neuronal and astrocytic collapse in response to inhibitors of ATP production. Thus, midbrain neurons and astrocytes have a higher metabolic rate and ATP consumption that makes them more vulnerable to energy deprivation.
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Affiliation(s)
- XinPing Cheng
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK.,CAS Key Laboratory of Brain Function and Disease, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Andrey Y Vinokurov
- Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia
| | - Evgeniy A Zherebtsov
- Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia.,Optoelectronics and Measurement Techniques Laboratory, University of Oulu, Oulu, Finland
| | - Olga A Stelmashchuk
- Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia
| | - Plamena R Angelova
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK
| | - Noemi Esteras
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK
| | - Andrey Y Abramov
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK.,Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia
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12
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Inorganic polyphosphate is produced and hydrolyzed in F0F1-ATP synthase of mammalian mitochondria. Biochem J 2020; 477:1515-1524. [PMID: 32270854 PMCID: PMC7200627 DOI: 10.1042/bcj20200042] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 03/25/2020] [Accepted: 04/09/2020] [Indexed: 12/15/2022]
Abstract
Inorganic polyphosphate (polyP) is a polymer present in all living organisms. Although polyP is found to be involved in a variety of functions in cells of higher organisms, the enzyme responsible for polyP production and consumption has not yet been identified. Here, we studied the effect of polyP on mitochondrial respiration, oxidative phosphorylation and activity of F0F1-ATPsynthase. We have found that polyP activates mitochondrial respiration which does not coupled with ATP production (V2) but inhibits ADP-dependent respiration (V3). Moreover, PolyP can stimulate F0F1-ATPase activity in the presence of ATP and, importantly, can be hydrolyzed in this enzyme instead of ATP. Furthermore, PolyP can be produced in mitochondria in the presence of substrates for respiration and phosphate by the F0F1-ATPsynthase. Thus, polyP is an energy molecule in mammalian cells which can be produced and hydrolyzed in the mitochondrial F0F1-ATPsynthase.
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