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Herb M. NADPH Oxidase 3: Beyond the Inner Ear. Antioxidants (Basel) 2024; 13:219. [PMID: 38397817 PMCID: PMC10886416 DOI: 10.3390/antiox13020219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Revised: 02/02/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
Reactive oxygen species (ROS) were formerly known as mere byproducts of metabolism with damaging effects on cellular structures. The discovery and description of NADPH oxidases (Nox) as a whole enzyme family that only produce this harmful group of molecules was surprising. After intensive research, seven Nox isoforms were discovered, described and extensively studied. Among them, the NADPH oxidase 3 is the perhaps most underrated Nox isoform, since it was firstly discovered in the inner ear. This stigma of Nox3 as "being only expressed in the inner ear" was also used by me several times. Therefore, the question arose whether this sentence is still valid or even usable. To this end, this review solely focuses on Nox3 and summarizes its discovery, the structural components, the activating and regulating factors, the expression in cells, tissues and organs, as well as the beneficial and detrimental effects of Nox3-mediated ROS production on body functions. Furthermore, the involvement of Nox3-derived ROS in diseases progression and, accordingly, as a potential target for disease treatment, will be discussed.
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Affiliation(s)
- Marc Herb
- Institute for Medical Microbiology, Immunology and Hygiene, Faculty of Medicine, University Hospital Cologne, University of Cologne, 50935 Cologne, Germany;
- German Centre for Infection Research, Partner Site Bonn-Cologne, 50931 Cologne, Germany
- Cologne Cluster of Excellence on Cellular Stress Responses in Aging-Associated Diseases (CECAD), 50931 Cologne, Germany
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2
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Role of NADPH Oxidases in Blood-Brain Barrier Disruption and Ischemic Stroke. Antioxidants (Basel) 2022; 11:antiox11101966. [PMID: 36290688 PMCID: PMC9598888 DOI: 10.3390/antiox11101966] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/26/2022] [Accepted: 09/26/2022] [Indexed: 11/16/2022] Open
Abstract
NADPH oxidases (Nox) are one of the main sources of reactive oxygen species (ROS) in the central nervous system (CNS). While these enzymes have been shown to be involved in physiological regulation of cerebral vascular tone, excessive ROS produced by Nox1-5 play a critical role in blood–brain barrier (BBB) dysfunction in numerous neuropathologies. Nox-derived ROS have been implicated in mediating matrix metalloprotease (MMP) activation, downregulation of junctional complexes between adjacent brain endothelial cells and brain endothelial cell apoptosis, leading to brain microvascular endothelial barrier dysfunction and consequently, increases in BBB permeability. In this review, we will highlight recent findings on the role played by these enzymes in BBB disruption induced by ischemic stroke.
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3
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Shirmanova MV, Gavrina AI, Kovaleva TF, Dudenkova VV, Zelenova EE, Shcheslavskiy VI, Mozherov AM, Snopova LB, Lukyanov KA, Zagaynova EV. Insight into redox regulation of apoptosis in cancer cells with multiparametric live-cell microscopy. Sci Rep 2022; 12:4476. [PMID: 35296739 PMCID: PMC8927414 DOI: 10.1038/s41598-022-08509-1] [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: 07/28/2021] [Accepted: 02/25/2022] [Indexed: 02/07/2023] Open
Abstract
Cellular redox status and the level of reactive oxygen species (ROS) are important regulators of apoptotic potential, playing a crucial role in the growth of cancer cell and their resistance to apoptosis. However, the relationships between the redox status and ROS production during apoptosis remain poorly explored. In this study, we present an investigation on the correlations between the production of ROS, the redox ratio FAD/NAD(P)H, the proportions of the reduced nicotinamide cofactors NADH and NADPH, and caspase-3 activity in cancer cells at the level of individual cells. Two-photon excitation fluorescence lifetime imaging microscopy (FLIM) was applied to monitor simultaneously apoptosis using the genetically encoded sensor of caspase-3, mKate2-DEVD-iRFP, and the autofluorescence of redox cofactors in colorectal cancer cells upon stimulation of apoptosis with staurosporine, cisplatin or hydrogen peroxide. We found that, irrespective of the apoptotic stimulus used, ROS accumulation correlated well with both the elevated pool of mitochondrial, enzyme-bound NADH and caspase-3 activation. Meanwhile, a shift in the contribution of bound NADH could develop independently of the apoptosis, and this was observed in the case of cisplatin. An increase in the proportion of bound NADPH was detected only in staurosporine-treated cells, this likely being associated with a high level of ROS production and their resulting detoxification. The results of the study favor the discovery of new therapeutic strategies based on manipulation of the cellular redox balance, which could help improve the anti-tumor activity of drugs and overcome apoptotic resistance.
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Affiliation(s)
- Marina V Shirmanova
- Privolzhsky Research Medical University, Minin and Pozharsky Sq. 10/1, 603005, Nizhny Novgorod, Russia.
| | - Alena I Gavrina
- Privolzhsky Research Medical University, Minin and Pozharsky Sq. 10/1, 603005, Nizhny Novgorod, Russia
| | - Tatiana F Kovaleva
- Privolzhsky Research Medical University, Minin and Pozharsky Sq. 10/1, 603005, Nizhny Novgorod, Russia
| | - Varvara V Dudenkova
- Privolzhsky Research Medical University, Minin and Pozharsky Sq. 10/1, 603005, Nizhny Novgorod, Russia
| | - Ekaterina E Zelenova
- National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 2nd Botkinsky proezd, 3, Moscow, Russia, 125284
| | - Vladislav I Shcheslavskiy
- Privolzhsky Research Medical University, Minin and Pozharsky Sq. 10/1, 603005, Nizhny Novgorod, Russia.,Becker&Hickl GmbH, Nunsdorfer Ring 7-9, 12277, Berlin, Germany
| | - Artem M Mozherov
- Privolzhsky Research Medical University, Minin and Pozharsky Sq. 10/1, 603005, Nizhny Novgorod, Russia
| | - Ludmila B Snopova
- Privolzhsky Research Medical University, Minin and Pozharsky Sq. 10/1, 603005, Nizhny Novgorod, Russia
| | - Konstantin A Lukyanov
- Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow, Russia, 121205
| | - Elena V Zagaynova
- Privolzhsky Research Medical University, Minin and Pozharsky Sq. 10/1, 603005, Nizhny Novgorod, Russia.,Lobachevsky State University of Nizhny Novgorod, Gagarin Avenue 23, Nizhny Novgorod, Russia, 603950
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4
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Dervisevic E, Voelcker NH, Risbridger G, Tuck KL, Cadarso VJ. Colorimetric Detection of Extracellular Hydrogen Peroxide Using an Integrated Microfluidic Device. Anal Chem 2022; 94:1726-1732. [PMID: 35014786 DOI: 10.1021/acs.analchem.1c04312] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
It is well known that hydrogen peroxide (H2O2) is a signaling molecule essential for vital physiological reactions in mammalian cells, such as cell survival, intercellular communication, and cancer metabolism. However, to fully understand the function of H2O2, it is critical to monitor its intracellular and/or extracellular concentrations. Current techniques implemented to address this need require large sample volumes, expensive instrumentation, and long sample preparation and analysis times, inapplicable to inline or online monitoring. In this paper, a new integrated microfluidic device capable of overcoming these limitations is demonstrated for the colorimetric detection of extracellular hydrogen peroxide H2O2. The device contains an optical waveguide to determine absorbance changes and micromixers to enable complete mixing of reagents using a passive approach. This novel H2O2-sensing device has allowed the detection of H2O2 in the range of 0.5-60 μM with a detection limit of 167 ± 5.8 nM and a sensitivity of 13.5 ± 0.1 AU/mM. Proof of concept of the device was demonstrated by quantifying H2O2 release from benign prostatic epithelial (BPH-1) cells upon stimulation with phorbol 12-myristate 13-acetate (PMA). Results show that this integrated device can be potentially utilized to continuously monitor cell-released metabolites autonomously without constant human supervision during the process. Furthermore, this can be achieved without interfering with the cell culture conditions, as only a very small volume of conditioned media (less than 0.4 μL), and not the cells, is required.
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Affiliation(s)
- Esma Dervisevic
- Department of Mechanical and Aerospace Engineering, Monash University, Room 227, New Horizons Building, 20 Research Way, Clayton, Melbourne, Victoria 3800, Australia
| | - Nicolas H Voelcker
- Monash Institute of Pharmaceutical Sciences (MIPS), Monash University, 381 Royal Parade, Parkville, Melbourne, Victoria 3052, Australia.,The Melbourne Centre for Nanofabrication, Victorian Node - Australian National Fabrication Facility, Clayton, Melbourne, Victoria 3800, Australia.,Commonwealth Scientific and Industrial Research Organization (CSIRO), Clayton, Melbourne, Victoria 3168, Australia
| | - Gail Risbridger
- Prostate Cancer Translational Research Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria 3000, Australia.,Cancer Program, Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Clayton, Melbourne, Victoria 3800, Australia.,Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
| | - Kellie L Tuck
- School of Chemistry, Monash University, Clayton, Melbourne, Victoria 3800, Australia
| | - Victor J Cadarso
- Department of Mechanical and Aerospace Engineering, Monash University, Room 227, New Horizons Building, 20 Research Way, Clayton, Melbourne, Victoria 3800, Australia.,The Melbourne Centre for Nanofabrication, Victorian Node - Australian National Fabrication Facility, Clayton, Melbourne, Victoria 3800, Australia.,Centre to Impact Antimicrobial Resistance─Sustainable Solutions, Monash University, Clayton, Melbourne, Victoria 3800 Australia
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5
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Fang J, Sheng R, Qin ZH. NADPH Oxidases in the Central Nervous System: Regional and Cellular Localization and the Possible Link to Brain Diseases. Antioxid Redox Signal 2021; 35:951-973. [PMID: 34293949 DOI: 10.1089/ars.2021.0040] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Significance: The significant role of reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase (Nox) in signal transduction is mediated by the production of reactive oxygen species (ROS), especially in the central nervous system (CNS). The pathogenesis of some neurologic and psychiatric diseases is regulated by ROS, acting as a second messenger or pathogen. Recent Advances: In the CNS, the involvement of Nox-derived ROS has been implicated in the regulation of multiple signals, including cell survival/apoptosis, neuroinflammation, migration, differentiation, proliferation, and synaptic plasticity, as well as the integrity of the blood/brain barrier. In these processes, the intracellular signals mediated by the members of the Nox family vary among different tissues. The present review illuminates the regions and cellular, subcellular localization of Nox isoforms in the brain, the signal transduction, and the role of NOX enzymes in pathophysiology, respectively. Critical Issues: Different signal transduction cascades are coupled to ROS derived from various Nox homologues with varying degrees. Therefore, a critical issue worth noting is the varied role of the homologues of NOX enzymes in different signaling pathways and also they mediate different phenotypes in the diverse pathophysiological condition. This substantiates the effectiveness of selective Nox inhibitors in the CNS. Future Directions: Further investigation to elucidate the role of various homologues of NOX enzymes in acute and chronic brain diseases and signaling mechanisms, and the development of more specific NOX inhibitors for the treatment of CNS disease are urgently needed. Antioxid. Redox Signal. 35, 951-973.
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Affiliation(s)
- Jie Fang
- Department of Pharmacology and Laboratory of Aging and Nervous Diseases, Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, College of Pharmaceutical Science, Soochow University, Suzhou, China
| | - Rui Sheng
- Department of Pharmacology and Laboratory of Aging and Nervous Diseases, Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, College of Pharmaceutical Science, Soochow University, Suzhou, China
| | - Zheng-Hong Qin
- Department of Pharmacology and Laboratory of Aging and Nervous Diseases, Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, College of Pharmaceutical Science, Soochow University, Suzhou, China
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6
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Bassiouni W, Seubert JM, Schulz R. Staurosporine-induced cleavage of apoptosis-inducing factor in human fibrosarcoma cells is independent of matrix metalloproteinase-2. Can J Physiol Pharmacol 2021; 100:184-191. [PMID: 34597523 DOI: 10.1139/cjpp-2021-0199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Apoptosis-inducing factor (AIF) is a mitochondrial flavoprotein which mediates staurosporine (STS)-induced cell death. AIF cleavage and translocation to the cytosol is thought to be calpain-1-dependent as calpain inhibitors reduced AIF proteolysis. However, many calpain inhibitors also inhibit matrix metalloproteinase-2 (MMP-2) activity, an intracellular and extracellular protease implicated in apoptosis. Here we investigated whether MMP-2 activity is affected in response to STS and if contributes to AIF cleavage. Human fibrosarcoma HT1080 cells were treated with STS (0.1 µM, 0.25-24 hr). A significant increase in cellular MMP-2 activity was seen by gelatin zymography after 6 hr STS treatment, prior to induction of cell necrosis. Western blot showed the time-dependent appearance of two forms of AIF (~60 and 45 kDa) in the cytosol which were significantly increased at 6 hr. Surprisingly, knocking down MMP-2 or inhibiting its activity with MMP-2 preferring inhibitors ARP-100 or ONO-4817, or inhibiting calpain activity with ALLM or PD150606, did not prevent the STS-induced increase in cytosolic AIF. These results show that although STS rapidly increases MMP-2 activity, the cytosolic release of AIF may be independent of the proteolytic activities of MMP-2 or calpain.
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Affiliation(s)
- Wesam Bassiouni
- University of Alberta Faculty of Medicine & Dentistry, 12357, Department of Pharmacology, Edmonton, Alberta, Canada;
| | - John M Seubert
- University of Alberta, Faculty of Pharmacy/Pharmaceutical Sciences, 3-142D Katz Group Centre for Pharmacy & Health Research, 11361 - 87 Ave., 2020M Katz Group Centre for Pharmacy and Health Research, Edmonton, Alberta, Canada, T6G 2E1;
| | - Richard Schulz
- University of Alberta, Pediatrics & Pharmacology, Cardiovascular Research Centre, Mazankowski Alberta Heart Institute, 462 HMRC, Edmonton, Alberta, Canada, T6G 2S2;
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Quantifying Cytosolic Cytochrome c Concentration Using Carbon Quantum Dots as a Powerful Method for Apoptosis Detection. Pharmaceutics 2021; 13:pharmaceutics13101556. [PMID: 34683849 PMCID: PMC8537359 DOI: 10.3390/pharmaceutics13101556] [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: 08/05/2021] [Revised: 09/08/2021] [Accepted: 09/20/2021] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Cytochrome c (Cyt c) is a key biomarker for early apoptosis, and many methods were designed to detect its release from mitochondria. For a proper evaluation of these programed cell death mechanisms, fluorescent nanoparticles are excellent candidates due to their valuable optical properties. Among all classes of nanoparticles developed thus far, carbon-based quantum dots bring qualitative and efficient imaging strategies for biomedical applications as a consequence of their biocompatibility and low cytotoxicity. METHODS In this study, we synthesized carbon quantum dots smaller than 5 nm from sodium citrate and polyethylene imine. These nanoparticles were rigorously characterized, and their quenching capacity in apoptotic events was assessed in A549 cells treated with staurosporine and etoposide. For the evaluation of Cyt c release, a phenomenon directly correlated with apoptotic events, we ran a semiquantitative analysis using confocal laser scanning microscopy. RESULTS Carbon quantum dots were synthesized and were successfully employed for Cyt c detection by means of fluorescence microscopy. Significant drops in fluorescence intensity were observed in the case of cells treated with apoptosis-inducing therapeutic compounds compared to untreated cells, confirming Cyt c release from mitochondria to cytosol. CONCLUSION Considering these results, we strongly believe this method can contribute to an indirect in vitro evaluation of apoptosis.
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8
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Alassaf E, Mueller A. The role of PKC in CXCL8 and CXCL10 directed prostate, breast and leukemic cancer cell migration. Eur J Pharmacol 2020; 886:173453. [PMID: 32777211 DOI: 10.1016/j.ejphar.2020.173453] [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] [Received: 01/24/2020] [Revised: 07/30/2020] [Accepted: 07/30/2020] [Indexed: 01/18/2023]
Abstract
Migration of tumour cells is a fundamental process for the formation and progression of metastasis in malignant diseases. Chemokines binding to their cognate receptors induce the migration of cancer cells, however, the molecular signalling pathways involved in this process are not fully understood. Protein kinase C (PKC) has been shown to regulate cell migration, adhesion and proliferation. In order to identify a connection between PKC and tumour progression in breast, prostate and leukaemia cells, the effect of PKC on CXCL8 or CXCL10-mediated cell migration and morphology was analysed. We tested the speed of the migrating cells, morphology, and chemotaxis incubated with different PKC isoforms inhibitors- GF109203X, staurosporine and PKCζ pseudosubstrate inhibitor (PKCζi). We found that the migration of CXCL8-driven PC3 and MDA-MB231 cells in the presence of conventional, novel or atypical PKCs was not affected, but atypical PKCζ is crucial for THP-1 chemotaxis. The speed of CXCL10-activated PC3 and MDA-MB231 cells was significantly reduced in the presence of conventional, novel and atypical PKCζ. THP-1 chemotaxis was again affected by atypical PKCζi. On the other hand, cell area, circularity or aspect ratio were affected by staurosporine in CXCL8 or CXCL10-activated cells, demonstrating a role of PKCα in the rearrangement of the cytoskeleton regardless of the effect on the migration. Consequently, this allows the speculation that different PKC isoforms induce different outcomes in migration and actin cytoskeleton based on the chemokine receptor and/or the cell type.
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Affiliation(s)
- Enana Alassaf
- School of Pharmacy, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Anja Mueller
- School of Pharmacy, University of East Anglia, Norwich, NR4 7TJ, UK.
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9
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Blue light-triggered photochemistry and cytotoxicity of retinal. Cell Signal 2020; 69:109547. [PMID: 31982549 DOI: 10.1016/j.cellsig.2020.109547] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 01/14/2020] [Accepted: 01/22/2020] [Indexed: 01/08/2023]
Abstract
The chemical- and photo- toxicity of chromophore retinal on cells have long been debated. Although we recently showed that retinal and blue light exposure interrupt cellular signaling, a comprehensive study examining molecular underpinnings of this perturbation and its consequences to cellular fate is lacking. Here, we report molecular evidence for blue light excited-retinal induced oxidative damage of polyunsaturated lipid anchors in membrane-interacting signaling molecules and DNA damage in cells using live-cell imaging and in vitro experimentation. The incurred molecular damage irreversibly disrupted subcellular localization of these molecules, a crucial criterion for their signaling. We further show retinal accumulation in lipid-bilayers of cell membranes could enhance the lifetime of retinal in cells. Comparative response-signatures suggest that retinal triggers reactions upon photoexcitation similar to photodynamic therapy agents and generate reactive oxygen species in cells. Additionally, data also shows that exposing retinal-containing cells to sunlight induces substantial cytotoxicity. Collectively, our results explain a likely in vivo mechanism and reaction conditions under which bio-available retinal in physiological light conditions damages cells.
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10
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Macáková K, Afonso R, Saso L, Mladěnka P. The influence of alkaloids on oxidative stress and related signaling pathways. Free Radic Biol Med 2019; 134:429-444. [PMID: 30703480 DOI: 10.1016/j.freeradbiomed.2019.01.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 01/16/2019] [Accepted: 01/21/2019] [Indexed: 12/19/2022]
Abstract
Alkaloids have always attracted scientific interest due to either their positive or negative effects on human beings. This review aims to summarize their antioxidant effects by both classical in vitro scavenging assay and at the cellular level. Since most in vitro studies used the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging assay, the results from those studies are summed up in the first part of the article. In the second part, available data on the effect of alkaloids on NADPH-oxidase, the key enzyme for reactive oxygen species production, at the cellular level, are summarized. More than 130 alkaloids were tested by DPPH assay. However, due to methodological differences, a direct comparison is hardly possible. It can be at least concluded that some of them were either similar to or even more active than standard antioxidants and the number of aromatic hydroxyl groups seems to be the major determinant for the activity. The data on inhibition of NADPH-oxidase activity by alkaloids demonstrated that there is little relationship to the DPPH assay. The mechanism seems to be based on inhibition of synthesis, activation or translocation of NADPH-oxidase subunits. In some alkaloids, activation of the nuclear factor Nrf2 pathway was documented to be the grounds for inhibition of NADPH-oxidase. Interestingly, many alkaloids can behave both as anti-oxidants and pro-oxidants depending on conditions and pro-oxidation might be the reason for activation of Nrf2. Available data on other "antioxidant" transcription factors FOXOs and PPARs are also mentioned.
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Affiliation(s)
- Kateřina Macáková
- Department of Pharmaceutical Botany, Charles University, Faculty of Pharmacy in Hradec Králové, Heyrovského 1203, 500 05 Hradec Králové, Czech Republic.
| | - Rita Afonso
- Department of Pharmacology and Toxicology, Charles University, Faculty of Pharmacy in Hradec Králové, Heyrovského 1203, 500 05 Hradec Králové, Czech Republic.
| | - Luciano Saso
- Department of Physiology and Pharmacology "Vittorio Erspamer", Sapienza University of Rome, Piazzale Aldo Moro 5, Rome, Italy.
| | - Přemysl Mladěnka
- Department of Pharmacology and Toxicology, Charles University, Faculty of Pharmacy in Hradec Králové, Heyrovského 1203, 500 05 Hradec Králové, Czech Republic.
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Simenc J, Juric DM, Lipnik-Stangelj M. NADPH oxidase inhibitor VAS2870 prevents staurosporine-induced cell death in rat astrocytes. Radiol Oncol 2019; 53:69-76. [PMID: 30661061 PMCID: PMC6411017 DOI: 10.2478/raon-2019-0002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 11/18/2018] [Indexed: 12/31/2022] Open
Abstract
Background Astrocytes maintain central nerve system homeostasis and are relatively resistant to cell death. Dysfunction of cell death mechanisms may underlie glioblastoma genesis and resistance to cancer therapy; therefore more detailed understanding of astrocytic death modalities is needed in order to design effective therapy. The purpose of this study was to determine the effect of VAS2870, a pan-NADPH oxidase inhibitor, on staurosporine-induced cell death in astrocytes. Materials and methods Cultured rat astrocytes were treated with staurosporine as activator of cell death. Cell viability, production of reactive oxygen species (ROS), and mitochondrial potential were examined using flow cytometric analysis, while chemiluminescence analysis was performed to assess caspase 3/7 activity and cellular ATP. Results We show here for the first time, that VAS2870 is able to prevent staurosporine-induced cell death. Staurosporine exerts its toxic effect through increased generation of ROS, while VAS2870 reduces the level of ROS. Further, VAS2870 partially restores mitochondrial inner membrane potential and level of ATP in staurosporine treated cells. Conclusions Staurosporine induces cell death in cultured rat astrocytes through oxidative stress. Generation of ROS, mitochondrial membrane potential and energy level are sensitive to VAS2870, which suggests NADPH oxidases as an important effector of cell death. Consequently, NADPH oxidases activation pathway could be an important target to modulate astrocytic death.
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Affiliation(s)
- Janez Simenc
- University of Ljubljana, Faculty of Medicine, Department of Pharmacology and Experimental Toxicology, Ljubljana, Slovenia
| | - Damijana Mojca Juric
- University of Ljubljana, Faculty of Medicine, Department of Pharmacology and Experimental Toxicology, Ljubljana, Slovenia
| | - Metoda Lipnik-Stangelj
- University of Ljubljana, Faculty of Medicine, Department of Pharmacology and Experimental Toxicology, Ljubljana, Slovenia
- Prof. Metoda Lipnik-Stangelj, M.D., M.Pharm., Ph.D., University of Ljubljana, Faculty of Medicine,Department of Pharmacology and Experimental Toxicology, Korytkova ulica 2, SI-1000 Ljubljana, Slovenia. Phone: +386 1 5437330
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12
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Kovac S, Dinkova Kostova AT, Herrmann AM, Melzer N, Meuth SG, Gorji A. Metabolic and Homeostatic Changes in Seizures and Acquired Epilepsy-Mitochondria, Calcium Dynamics and Reactive Oxygen Species. Int J Mol Sci 2017; 18:E1935. [PMID: 28885567 PMCID: PMC5618584 DOI: 10.3390/ijms18091935] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 09/02/2017] [Accepted: 09/05/2017] [Indexed: 12/17/2022] Open
Abstract
Acquired epilepsies can arise as a consequence of brain injury and result in unprovoked seizures that emerge after a latent period of epileptogenesis. These epilepsies pose a major challenge to clinicians as they are present in the majority of patients seen in a common outpatient epilepsy clinic and are prone to pharmacoresistance, highlighting an unmet need for new treatment strategies. Metabolic and homeostatic changes are closely linked to seizures and epilepsy, although, surprisingly, no potential treatment targets to date have been translated into clinical practice. We summarize here the current knowledge about metabolic and homeostatic changes in seizures and acquired epilepsy, maintaining a particular focus on mitochondria, calcium dynamics, reactive oxygen species and key regulators of cellular metabolism such as the Nrf2 pathway. Finally, we highlight research gaps that will need to be addressed in the future which may help to translate these findings into clinical practice.
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Affiliation(s)
- Stjepana Kovac
- Department of Neurology, University of Münster, 48149 Münster, Germany.
| | - Albena T Dinkova Kostova
- Division of Cancer Research, School of Medicine, Jacqui Wood Cancer Centre, Ninewells Hospital and Medical School, University of Dundee, Dundee DD1 9SY, UK.
- Departments of Medicine and Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
| | | | - Nico Melzer
- Department of Neurology, University of Münster, 48149 Münster, Germany.
| | - Sven G Meuth
- Department of Neurology, University of Münster, 48149 Münster, Germany.
| | - Ali Gorji
- Department of Neurology, University of Münster, 48149 Münster, Germany.
- Shefa Neuroscience Research Center, Khatam Alanbia Hospital, Tehran 1996836111, Iran.
- Department of Neuroscience, Mashhad University of Medical Sciences, Mashhad 9177948564, Iran.
- Department of Neurosurgery, University of Münster, 48149 Münster, Germany.
- Epilepsy Research Center, University of Münster, 48149 Münster, Germany.
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13
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Peroxynitrite is Involved in the Apoptotic Death of Cultured Cerebellar Granule Neurons Induced by Staurosporine, but not by Potassium Deprivation. Neurochem Res 2015; 41:316-27. [PMID: 26700430 DOI: 10.1007/s11064-015-1805-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 12/08/2015] [Accepted: 12/09/2015] [Indexed: 01/13/2023]
Abstract
Nitric oxide (NO) regulates numerous physiological process and is the main source of reactive nitrogen species (RNS). NO promotes cell survival, but it also induces apoptotic death having been involved in the pathogenesis of several neurodegenerative diseases. NO and superoxide anion react to form peroxynitrite, which accounts for most of the deleterious effects of NO. The mechanisms by which these molecules regulate the apoptotic process are not well understood. In this study, we evaluated the role of NO and peroxynitrite in the apoptotic death of cultured cerebellar granule neurons (CGN), which are known to experience apoptosis by staurosporine (St) or potassium deprivation (K5). We found that CGN treated with the peroxynitrite catalyst, FeTTPs were completely rescued from St-induced death, but not from K5-induced death. On the other hand, the inhibition of the inducible nitric oxide synthase partially protected cell viability in CGN treated with K5, but not with St, while the inhibitor L-NAME further reduced the cell viability in St, but it did not affect K5. Finally, an inhibitor of the soluble guanylate cyclase (sGC) diminished the cell viability in K5, but not in St. Altogether, these results shows that NO promotes cell survival in K5 through sGC-cGMP and promotes cell death by other mechanisms, while in St NO promotes cell survival independently of cGMP and peroxynitrite results critical for St-induced death. Our results suggest that RNS are differentially handled by CGN during cell death depending on the death-inducing conditions.
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