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Kalozoumi G, Kel-Margoulis O, Vafiadaki E, Greenberg D, Bernard H, Soreq H, Depaulis A, Sanoudou D. Glial responses during epileptogenesis in Mus musculus point to potential therapeutic targets. PLoS One 2018; 13:e0201742. [PMID: 30114263 PMCID: PMC6095496 DOI: 10.1371/journal.pone.0201742] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 07/21/2018] [Indexed: 01/21/2023] Open
Abstract
The Mesio-Temporal Lobe Epilepsy syndrome is the most common form of intractable epilepsy. It is characterized by recurrence of focal seizures and is often associated with hippocampal sclerosis and drug resistance. We aimed to characterize the molecular changes occurring during the initial stages of epileptogenesis in search of new therapeutic targets for Mesio-Temporal Lobe Epilepsy. We used a mouse model obtained by intra-hippocampal microinjection of kainate and performed hippocampal whole genome expression analysis at 6h, 12h and 24h post-injection, followed by multilevel bioinformatics analysis. We report significant changes in immune and inflammatory responses, neuronal network reorganization processes and glial functions, predominantly initiated during status epilepticus at 12h and persistent after the end of status epilepticus at 24h post-kainate. Upstream regulator analysis highlighted Cyba, Cybb and Vim as central regulators of multiple overexpressed genes implicated in glial responses at 24h. In silico microRNA analysis indicated that miR-9, miR-19b, miR-129, and miR-223 may regulate the expression of glial-associated genes at 24h. Our data support the hypothesis that glial-mediated inflammatory response holds a key role during epileptogenesis, and that microglial cells may participate in the initial process of epileptogenesis through increased ROS production via the NOX complex.
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Affiliation(s)
- Georgia Kalozoumi
- Clinical Genomics and Pharmacogenomics Unit, 4 Department of Internal Medicine, Attikon Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | | | - Elizabeth Vafiadaki
- Molecular Biology Division, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - David Greenberg
- The Edmond and Lily Safra Center for Brain Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | | | - Hermona Soreq
- The Edmond and Lily Safra Center for Brain Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Antoine Depaulis
- INSERM, Grenoble, France
- Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France
- CHU de Grenoble, Hôpital Michallon, Grenoble, France
| | - Despina Sanoudou
- Clinical Genomics and Pharmacogenomics Unit, 4 Department of Internal Medicine, Attikon Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
- Molecular Biology Division, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
- * E-mail:
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Savelieff MG, Nam G, Kang J, Lee HJ, Lee M, Lim MH. Development of Multifunctional Molecules as Potential Therapeutic Candidates for Alzheimer’s Disease, Parkinson’s Disease, and Amyotrophic Lateral Sclerosis in the Last Decade. Chem Rev 2018; 119:1221-1322. [DOI: 10.1021/acs.chemrev.8b00138] [Citation(s) in RCA: 270] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Masha G. Savelieff
- SciGency Science Communications, Ann Arbor, Michigan 48104, United States
| | - Geewoo Nam
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Juhye Kang
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Hyuck Jin Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Misun Lee
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Mi Hee Lim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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Occelli F, Lameth J, Adenis V, Huetz C, Lévêque P, Jay TM, Edeline JM, Mallat M. A Single Exposure to GSM-1800 MHz Signals in the Course of an Acute Neuroinflammatory Reaction can Alter Neuronal Responses and Microglial Morphology in the Rat Primary Auditory Cortex. Neuroscience 2018; 385:11-24. [DOI: 10.1016/j.neuroscience.2018.06.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 05/10/2018] [Accepted: 06/01/2018] [Indexed: 12/21/2022]
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Abstract
SIGNIFICANCE Oxidative stress increases in the brain with aging and neurodegenerative diseases. Previous work emphasized irreversible oxidative damage in relation to cognitive impairment. This research has evolved to consider a continuum of alterations, from redox signaling to oxidative damage, which provides a basis for understanding the onset and progression of cognitive impairment. This review provides an update on research linking redox signaling to altered function of neural circuits involved in information processing and memory. Recent Advances: Starting in middle age, redox signaling triggers changes in nervous system physiology described as senescent physiology. Hippocampal senescent physiology involves decreased cell excitability, altered synaptic plasticity, and decreased synaptic transmission. Recent studies indicate N-methyl-d-aspartate and ryanodine receptors and Ca2+ signaling molecules as molecular substrates of redox-mediated senescent physiology. CRITICAL ISSUES We review redox homeostasis mechanisms and consider the chemical character of reactive oxygen and nitrogen species and their role in regulating different transmitter systems. In this regard, senescent physiology may represent the co-opting of pathways normally responsible for feedback regulation of synaptic transmission. Furthermore, differences across transmitter systems may underlie differential vulnerability of brain regions and neuronal circuits to aging and disease. FUTURE DIRECTIONS It will be important to identify the intrinsic mechanisms for the shift in oxidative/reductive processes. Intrinsic mechanism will depend on the transmitter system, oxidative stressors, and expression/activity of antioxidant enzymes. In addition, it will be important to identify how intrinsic processes interact with other aging factors, including changes in inflammatory or hormonal signals. Antioxid. Redox Signal. 28, 1724-1745.
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Affiliation(s)
- Ashok Kumar
- 1 Department of Neuroscience, McKnight Brain Institute, University of Florida , Gainesville, Florida
| | - Brittney Yegla
- 1 Department of Neuroscience, McKnight Brain Institute, University of Florida , Gainesville, Florida
| | - Thomas C Foster
- 1 Department of Neuroscience, McKnight Brain Institute, University of Florida , Gainesville, Florida.,2 Genetics and Genomics Program, Genetics Institute, University of Florida , Gainesville, Florida
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55
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Huang WY, Lin S, Chen HY, Chen YP, Chen TY, Hsu KS, Wu HM. NADPH oxidases as potential pharmacological targets against increased seizure susceptibility after systemic inflammation. J Neuroinflammation 2018; 15:140. [PMID: 29753328 PMCID: PMC5948699 DOI: 10.1186/s12974-018-1186-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 05/02/2018] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Systemic inflammation associated with sepsis can induce neuronal hyperexcitability, leading to enhanced seizure predisposition and occurrence. Brain microglia are rapidly activated in response to systemic inflammation and, in this activated state, release multiple cytokines and signaling factors that amplify the inflammatory response and increase neuronal excitability. NADPH oxidase (NOX) enzymes promote microglial activation through the generation of reactive oxygen species (ROS), such as superoxide anion. We hypothesized that NOX isoforms, particularly NOX2, are potential targets for prevention of sepsis-associated seizures. METHODS To reduce NADPH oxidase 2-derived ROS production, mice with deficits of NOX regulatory subunit/NOX2 organizer p47phox (p47phox-/-) or NOX2 major subunit gp91phox (gp91phox-/-) were used or the NOX2-selective inhibitor diphenyleneiodonium (DPI) was used to treat wild-type (WT) mice. Systemic inflammation was induced by intraperitoneal injection of lipopolysaccharide (LPS). Seizure susceptibility was compared among mouse groups in response to intraperitoneal injection of pentylenetetrazole (PTZ). Brain tissues were assayed for proinflammatory gene and protein expression, and immunofluorescence staining was used to estimate the proportion of activated microglia. RESULTS Increased susceptibility to PTZ-induced seizures following sepsis was significantly attenuated in gp91phox-/- and p47phox-/- mice compared with WT mice. Both gp91phox-/- and p47phox-/- mice exhibited reduced microglia activation and lower brain induction of multiple proconvulsive cytokines, including TNFα, IL-1β, IL-6, and CCL2, compared with WT mice. Administration of DPI following LPS injection significantly attenuated the increased susceptibility to PTZ-induced seizures and reduced both microglia activation and brain proconvulsive cytokine concentrations compared with vehicle-treated controls. DPI also inhibited the upregulation of gp91phox transcripts following LPS injection. CONCLUSIONS Our results indicate that NADPH oxidases contribute to the development of increased seizure susceptibility in mice after sepsis. Pharmacologic inhibition of NOX may be a promising therapeutic approach to reducing sepsis-associated neuroinflammation, neuronal hyperexcitability, and seizures.
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Affiliation(s)
- Wan-Yu Huang
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Pediatrics of Kung-Ten General Hospital, Taichung City, Taiwan
| | - Shankung Lin
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Hsuan-Ying Chen
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Ya-Ping Chen
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Ting-Yu Chen
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Kuei-Sen Hsu
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
| | - Hung-Ming Wu
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan.
- Department of Neurology, Changhua Christian Hospital, Changhua City, Taiwan.
- Institute of Acupuncture, School of Chinese Medicine, China Medical University, Taichung City, Taiwan.
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Pravalika K, Sarmah D, Kaur H, Wanve M, Saraf J, Kalia K, Borah A, Yavagal DR, Dave KR, Bhattacharya P. Myeloperoxidase and Neurological Disorder: A Crosstalk. ACS Chem Neurosci 2018; 9:421-430. [PMID: 29351721 DOI: 10.1021/acschemneuro.7b00462] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Myeloperoxidase (MPO) is a protein present in azurophilic granules, macrophages, and neutrophils that are released into extracellular fluid (ECF) during inflammation. MPO releases hypochlorous acid (HOCl) and other chlorinated species. It is derived from hydrogen peroxide (H2O2) showing response during inflammatory conditions and plays a role in the immune defense against pathogens. MPO may show unwanted effects by indirectly increasing the formation of reactive nitrogen species (RNS), reactive oxygen species (ROS), and tumor necrosis factor alpha (TNF-α) leading to inflammation and oxidative stress. As neuroinflammation is one of the inevitable biological components among most of neurological disorders, MPO and its receptor may be explored as candidates for future clinical interventions. The purpose of this review is to provide an overview of the pathophysiological characteristics of MPO and further explore the possibilities to target it for clinical use. Targeting MPO is promising and may open an avenue to act as a biomarker for diagnosis with defined risk stratification in patients with various neurological disorders.
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Affiliation(s)
- Kanta Pravalika
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad Gandhinagar, 382 355 Gujarat, India
| | - Deepaneeta Sarmah
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad Gandhinagar, 382 355 Gujarat, India
| | - Harpreet Kaur
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad Gandhinagar, 382 355 Gujarat, India
| | - Madhuri Wanve
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad Gandhinagar, 382 355 Gujarat, India
| | - Jackson Saraf
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad Gandhinagar, 382 355 Gujarat, India
| | - Kiran Kalia
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad Gandhinagar, 382 355 Gujarat, India
| | - Anupom Borah
- Cellular and Molecular Neurobiology Laboratory, Department of Life Science and Bioinformatics, Assam University, Silchar, 788 011 Assam, India
| | - Dileep R Yavagal
- Department of Neurology and Neurosurgery, University of Miami Miller School of Medicine, Miami, Florida 33136, United States
| | - Kunjan R Dave
- Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida 33136, United States
| | - Pallab Bhattacharya
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad Gandhinagar, 382 355 Gujarat, India
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57
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Guo JD, Zhao X, Li Y, Li GR, Liu XL. Damage to dopaminergic neurons by oxidative stress in Parkinson's disease (Review). Int J Mol Med 2018; 41:1817-1825. [PMID: 29393357 DOI: 10.3892/ijmm.2018.3406] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Accepted: 12/13/2017] [Indexed: 11/05/2022] Open
Abstract
Oxidative stress is increasingly recognized as a central event contributing to the degeneration of dopaminergic neurons in the pathogenesis of Parkinson's disease (PD). Although reactive oxygen species (ROS) production is implicated as a causative factor in PD, the cellular and molecular mechanisms linking oxidative stress with dopaminergic neuron death are complex and not well characterized. The primary insults cause the greatest production of ROS, which contributes to oxidative damage by attacking all macromolecules, including lipids, proteins and nucleic acids, leading to defects in their physiological function. Consequently, the defects in these macromolecules result in mitochondrial dysfunction and neuroinflammation, which subsequently enhance the production of ROS and ultimately neuronal damage. The interaction between these various mechanisms forms a positive feedback loop that drives the progressive loss of dopaminergic neurons in PD, and oxidative stress‑mediated neuron damage appears to serve a central role in the neurodegenerative process. Thus, understanding the cellular and molecular mechanisms by which oxidative stress contributes to the loss of dopaminergic neurons may provide a promising therapeutic approach in PD treatment.
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Affiliation(s)
- Ji-Dong Guo
- Department of Neurology, The First Affiliated Hospital of Beihua University, Jilin, Jilin 132011, P.R. China
| | - Xin Zhao
- Department of Paediatrics, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Yang Li
- Department of Neurology, The Third Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Guang-Ren Li
- Department of Neurology, The Third Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Xiao-Liang Liu
- Cancer Center, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
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58
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Alawieyah Syed Mortadza S, Sim JA, Neubrand VE, Jiang LH. A critical role of TRPM2 channel in Aβ42
-induced microglial activation and generation of tumor necrosis factor-α. Glia 2017; 66:562-575. [DOI: 10.1002/glia.23265] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 10/26/2017] [Accepted: 11/03/2017] [Indexed: 12/18/2022]
Affiliation(s)
- Sharifah Alawieyah Syed Mortadza
- School of Biomedical Sciences, Faculty of Biological Sciences; University of Leeds; Leeds UK
- Faculty of Medicine and Health Science; University Putra Malaysia; Selangor Malaysia
| | - Joan A. Sim
- School of Medicine; University of Manchester; Manchester UK
| | - Veronika E. Neubrand
- Department of Cell Biology and Immunology, IPBLN-CSIC, Avda Conocimiento, PT Ciencias de La Salud; Institute of Parasitology and Biomedicine López-Neyra; Granada Spain
| | - Lin-Hua Jiang
- School of Biomedical Sciences, Faculty of Biological Sciences; University of Leeds; Leeds UK
- Sino-UK Joint Laboratory of Brain Function and Injury of Henan Province and Department of Physiology and Neurobiology; Xinxiang Medical University; Xinxiang China
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59
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Nicolas S, Cazareth J, Zarif H, Guyon A, Heurteaux C, Chabry J, Petit-Paitel A. Globular Adiponectin Limits Microglia Pro-Inflammatory Phenotype through an AdipoR1/NF-κB Signaling Pathway. Front Cell Neurosci 2017; 11:352. [PMID: 29184485 PMCID: PMC5694456 DOI: 10.3389/fncel.2017.00352] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 10/24/2017] [Indexed: 12/14/2022] Open
Abstract
We recently reported that increased levels of Adiponectin (ApN) in the brain led to microglia phenotype and activation state regulation, thus reducing both global brain inflammation and depressive-like behaviors in mice. Apart from this, little is known on ApN molecular effects on microglia, although these cells are crucial in both physiological and pathological processes. Here we fill this gap by studying the effects and targets of ApN toward neuroinflammation. Our findings suggest that ApN deficiency in mice leads to a higher sensitivity of mice to neuroinflammation that is due to enhanced microglia responsiveness to a pro-inflammatory challenge. Moreover, we show that globular ApN (gApN) exerts direct in vivo anti-inflammatory actions on microglia by reducing IL-1β, IL-6, and TNFα synthesis. In vitro, gApN anti-inflammatory properties are confirmed in brain-sorted microglia, primary cultured and microglia cell line (BV2), but are not observed on astrocytes. Our results also show that gApN blocks LPS-induced nitrosative and oxidative stress in microglia. Finally, we demonstrate for the first time that these anti-inflammatory and anti-oxidant actions of gApN on microglia are mediated through an AdipoR1/NF-κB signaling pathway.
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Affiliation(s)
- Sarah Nicolas
- Centre Nationnal de la Recherche Scientifique, UMR7275 Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d'Azur, Valbonne, France
| | - Julie Cazareth
- Centre Nationnal de la Recherche Scientifique, UMR7275 Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d'Azur, Valbonne, France
| | - Hadi Zarif
- Centre Nationnal de la Recherche Scientifique, UMR7275 Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d'Azur, Valbonne, France
| | - Alice Guyon
- Centre Nationnal de la Recherche Scientifique, UMR7275 Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d'Azur, Valbonne, France
| | - Catherine Heurteaux
- Centre Nationnal de la Recherche Scientifique, UMR7275 Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d'Azur, Valbonne, France
| | - Joëlle Chabry
- Centre Nationnal de la Recherche Scientifique, UMR7275 Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d'Azur, Valbonne, France
| | - Agnès Petit-Paitel
- Centre Nationnal de la Recherche Scientifique, UMR7275 Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d'Azur, Valbonne, France
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Belarbi K, Cuvelier E, Destée A, Gressier B, Chartier-Harlin MC. NADPH oxidases in Parkinson's disease: a systematic review. Mol Neurodegener 2017; 12:84. [PMID: 29132391 PMCID: PMC5683583 DOI: 10.1186/s13024-017-0225-5] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 10/25/2017] [Indexed: 12/15/2022] Open
Abstract
Parkinson's disease (PD) is a progressive movement neurodegenerative disease associated with a loss of dopaminergic neurons in the substantia nigra of the brain. Oxidative stress, a condition that occurs due to imbalance in oxidant and antioxidant status, is thought to play an important role in dopaminergic neurotoxicity. Nicotinamide adenine dinucleotide phosphate (NADPH) oxidases are multi-subunit enzymatic complexes that generate reactive oxygen species as their primary function. Increased immunoreactivities for the NADPH oxidases catalytic subunits Nox1, Nox2 and Nox4 have been reported in the brain of PD patients. Furthermore, knockout or genetic inactivation of NADPH oxidases exert a neuroprotective effect and reduce detrimental aspects of pathology in experimental models of the disease. However, the connections between NADPH oxidases and the biological processes believed to contribute to neuronal death are not well known. This review provides a comprehensive summary of our current understanding about expression and physiological function of NADPH oxidases in neurons, microglia and astrocytes and their pathophysiological roles in PD. It summarizes the findings supporting the role of both microglial and neuronal NADPH oxidases in cellular disturbances associated with PD such as neuroinflammation, alpha-synuclein accumulation, mitochondrial and synaptic dysfunction or disruption of the autophagy-lysosome system. Furthermore, this review highlights different steps that are essential for NADPH oxidases enzymatic activity and pinpoints major obstacles to overcome for the development of effective NADPH oxidases inhibitors for PD.
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Affiliation(s)
- Karim Belarbi
- University Lille, Inserm, CHU Lille, UMR-S 1172 - JPArc - Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer, F-59000, Lille, France
| | - Elodie Cuvelier
- University Lille, Inserm, CHU Lille, UMR-S 1172 - JPArc - Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer, F-59000, Lille, France
| | - Alain Destée
- University Lille, Inserm, CHU Lille, UMR-S 1172 - JPArc - Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer, F-59000, Lille, France
| | - Bernard Gressier
- University Lille, Inserm, CHU Lille, UMR-S 1172 - JPArc - Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer, F-59000, Lille, France
| | - Marie-Christine Chartier-Harlin
- University Lille, Inserm, CHU Lille, UMR-S 1172 - JPArc - Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer, F-59000, Lille, France. .,Inserm UMR S-1172 Team "Early stages of Parkinson's Disease", 1 Place de Verdun, 59006, Lille, France.
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61
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Tian L, Hui CW, Bisht K, Tan Y, Sharma K, Chen S, Zhang X, Tremblay ME. Microglia under psychosocial stressors along the aging trajectory: Consequences on neuronal circuits, behavior, and brain diseases. Prog Neuropsychopharmacol Biol Psychiatry 2017; 79:27-39. [PMID: 28095309 DOI: 10.1016/j.pnpbp.2017.01.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 12/30/2016] [Accepted: 01/13/2017] [Indexed: 12/18/2022]
Abstract
Mounting evidence indicates the importance of microglia for proper brain development and function, as well as in complex stress-related neuropsychiatric disorders and cognitive decline along the aging trajectory. Considering that microglia are resident immune cells of the brain, a homeostatic maintenance of their effector functions that impact neuronal circuitry, such as phagocytosis and secretion of inflammatory factors, is critical to prevent the onset and progression of these pathological conditions. However, the molecular mechanisms by which microglial functions can be properly regulated under healthy and pathological conditions are still largely unknown. We aim to summarize recent progress regarding the effects of psychosocial stress and oxidative stress on microglial phenotypes, leading to neuroinflammation and impaired microglia-synapse interactions, notably through our own studies of inbred mouse strains, and most importantly, to discuss about promising therapeutic strategies that take advantage of microglial functions to tackle such brain disorders in the context of adult psychosocial stress or aging-induced oxidative stress.
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Affiliation(s)
- Li Tian
- Neuroscience Center, University of Helsinki, Viikinkaari 4, Helsinki FIN-00014, Finland; Psychiatry Research Center, Beijing Huilongguan Hospital, Peking University, Beijing, China.
| | - Chin Wai Hui
- Axe Neurosciences, Centre de recherche du CHU de Québec, Québec, Canada
| | - Kanchan Bisht
- Axe Neurosciences, Centre de recherche du CHU de Québec, Québec, Canada
| | - Yunlong Tan
- Psychiatry Research Center, Beijing Huilongguan Hospital, Peking University, Beijing, China
| | - Kaushik Sharma
- Axe Neurosciences, Centre de recherche du CHU de Québec, Québec, Canada
| | - Song Chen
- Psychiatry Research Center, Beijing Huilongguan Hospital, Peking University, Beijing, China; Beijing Key Laboratory of Mental Disorders and Center of Schizophrenia, Beijing Institute for Brain Disorders, Beijing Anding Hospital, Capital Medical University, China
| | - Xiangyang Zhang
- Psychiatry Research Center, Beijing Huilongguan Hospital, Peking University, Beijing, China; Department of Psychiatry and Behavioral Sciences, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Marie-Eve Tremblay
- Axe Neurosciences, Centre de recherche du CHU de Québec, Québec, Canada.
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Profiling of cytosolic and mitochondrial H 2 O 2 production using the H 2 O 2- sensitive protein HyPer in LPS-induced microglia cells. Neurosci Lett 2017. [DOI: 10.1016/j.neulet.2017.06.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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63
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Wang J, Tian W, Wang S, Wei W, Wu D, Wang H, Wang L, Yang R, Ji A, Li Y. Anti-inflammatory and retinal protective effects of capsaicin on ischaemia-induced injuries through the release of endogenous somatostatin. Clin Exp Pharmacol Physiol 2017; 44:803-814. [PMID: 28429852 DOI: 10.1111/1440-1681.12769] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 03/31/2017] [Accepted: 04/15/2017] [Indexed: 12/13/2022]
Affiliation(s)
- Jun Wang
- Henan University School of Medicine; Kaifeng China
| | - Wenke Tian
- Henan University School of Medicine; Kaifeng China
| | | | - Wenqiang Wei
- Henan University School of Medicine; Kaifeng China
| | - Dongdong Wu
- Henan University School of Medicine; Kaifeng China
| | | | - Li Wang
- The First Affiliated Hospital of Henan University; Kaifeng China
| | - Ruisheng Yang
- The First Affiliated Hospital of Henan University; Kaifeng China
| | - Ailing Ji
- Henan University School of Medicine; Kaifeng China
| | - Yanzhang Li
- Henan University School of Medicine; Kaifeng China
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Lameth J, Gervais A, Colin C, Lévêque P, Jay TM, Edeline JM, Mallat M. Acute Neuroinflammation Promotes Cell Responses to 1800 MHz GSM Electromagnetic Fields in the Rat Cerebral Cortex. Neurotox Res 2017; 32:444-459. [PMID: 28578480 DOI: 10.1007/s12640-017-9756-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 05/16/2017] [Accepted: 05/19/2017] [Indexed: 01/08/2023]
Abstract
Mobile phone communications are conveyed by radiofrequency (RF) electromagnetic fields, including pulse-modulated global system for mobile communications (GSM)-1800 MHz, whose effects on the CNS affected by pathological states remain to be specified. Here, we investigated whether a 2-h head-only exposure to GSM-1800 MHz could impact on a neuroinflammatory reaction triggered by lipopolysaccharide (LPS) in 2-week-old or adult rats. We focused on the cerebral cortex in which the specific absorption rate (SAR) of RF averaged 2.9 W/kg. In developing rats, 24 h after GSM exposure, the levels of cortical interleukin-1ß (IL1ß) or NOX2 NADPH oxidase transcripts were reduced by 50 to 60%, in comparison with sham-exposed animals (SAR = 0), as assessed by RT-qPCR. Adult rats exposed to GSM also showed a 50% reduction in the level of IL1ß mRNA, but they differed from developing rats by the lack of NOX2 gene suppression and by displaying a significant growth response of microglial cell processes imaged in anti-Iba1-stained cortical sections. As neuroinflammation is often associated with changes in excitatory neurotransmission, we evaluated changes in expression and phosphorylation of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors in the adult cerebral cortex by Western blot analyses. We found that GSM exposure decreased phosphorylation at two residues on the GluA1 AMPAR subunit (serine 831 and 845). The GSM-induced changes in gene expressions, microglia, and GluA1 phosphorylation did not persist 72 h after RF exposure and were not observed in the absence of LPS pretreatment. Together, our data provide evidence that GSM-1800 MHz can modulate CNS cell responses triggered by an acute neuroinflammatory state.
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Affiliation(s)
- Julie Lameth
- Sorbonne Universités, UPMC Univ Paris 06, INSERM U.1127, CNRS, Institut du Cerveau et de la Moelle épinière (ICM), Hôpital Pitié-Salpêtrière, Bat. ICM, 47 boulevard de l'Hôpital, F-75013, Paris, France
| | - Annie Gervais
- Sorbonne Universités, UPMC Univ Paris 06, INSERM U.1127, CNRS, Institut du Cerveau et de la Moelle épinière (ICM), Hôpital Pitié-Salpêtrière, Bat. ICM, 47 boulevard de l'Hôpital, F-75013, Paris, France
| | - Catherine Colin
- Sorbonne Universités, UPMC Univ Paris 06, INSERM U.1127, CNRS, Institut du Cerveau et de la Moelle épinière (ICM), Hôpital Pitié-Salpêtrière, Bat. ICM, 47 boulevard de l'Hôpital, F-75013, Paris, France
| | - Philippe Lévêque
- Université de Limoges, CNRS, XLIM, UMR 7252, 123 avenue Albert Thomas, F-87000, Limoges, France
| | - Thérèse M Jay
- Physiopathologie des Maladies Psychiatriques, Centre de Psychiatrie et Neurosciences, UMR_S894 INSERM, Université Paris Descartes, 102-108 rue de la Santé, 75014, Paris, France
| | - Jean-Marc Edeline
- Paris Saclay Institute of Neuroscience, Neuro-PSI, UMR 9197 CNRS, Université Paris-Sud, 91405, Orsay cedex, France
| | - Michel Mallat
- Sorbonne Universités, UPMC Univ Paris 06, INSERM U.1127, CNRS, Institut du Cerveau et de la Moelle épinière (ICM), Hôpital Pitié-Salpêtrière, Bat. ICM, 47 boulevard de l'Hôpital, F-75013, Paris, France.
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65
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Vilhardt F, Haslund‐Vinding J, Jaquet V, McBean G. Microglia antioxidant systems and redox signalling. Br J Pharmacol 2017; 174:1719-1732. [PMID: 26754582 PMCID: PMC5446583 DOI: 10.1111/bph.13426] [Citation(s) in RCA: 92] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2015] [Revised: 12/15/2015] [Accepted: 01/07/2016] [Indexed: 12/13/2022] Open
Abstract
For many years, microglia, the resident CNS macrophages, have been considered only in the context of pathology, but microglia are also glial cells with important physiological functions. Microglia-derived oxidant production by NADPH oxidase (NOX2) is implicated in many CNS disorders. Oxidants do not stand alone, however, and are not always pernicious. We discuss in general terms, and where available in microglia, GSH synthesis and relation to cystine import and glutamate export, and the thioredoxin system as the most important antioxidative defence mechanism, and further, we discuss in the context of protein thiolation of target redox proteins the necessity for tightly localized, timed and confined oxidant production to work in concert with antioxidant proteins to promote redox signalling. NOX2-mediated redox signalling modulates the acquisition of the classical or alternative microglia activation phenotypes by regulating major transcriptional programs mediated through NF-κB and Nrf2, major regulators of the inflammatory and antioxidant response respectively. As both antioxidants and NOX-derived oxidants are co-secreted, in some instances redox signalling may extend to neighboring cells through modification of surface or cytosolic target proteins. We consider a role for microglia NOX-derived oxidants in paracrine modification of synaptic function through long term depression and in the communication with the adaptive immune system. There is little doubt that a continued foray into the functions of the antioxidant response in microglia will reveal antioxidant proteins as dynamic players in redox signalling, which in concert with NOX-derived oxidants fulfil important roles in the autocrine or paracrine regulation of essential enzymes or transcriptional programs. LINKED ARTICLES This article is part of a themed section on Redox Biology and Oxidative Stress in Health and Disease. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v174.12/issuetoc.
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Affiliation(s)
| | - J Haslund‐Vinding
- Institute of Cellular and Molecular MedicineCopenhagen UniversityCopenhagenDenmark
- Department of Pathology and ImmunologyCentre Médical UniversitaireGenevaSwitzerland
| | - V Jaquet
- Department of Pathology and ImmunologyCentre Médical UniversitaireGenevaSwitzerland
| | - G McBean
- UCD School of Biomolecular and Biomedical ScienceUniversity College DublinDublin 4Ireland
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66
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Teixeira G, Szyndralewiez C, Molango S, Carnesecchi S, Heitz F, Wiesel P, Wood JM. Therapeutic potential of NADPH oxidase 1/4 inhibitors. Br J Pharmacol 2017; 174:1647-1669. [PMID: 27273790 PMCID: PMC5446584 DOI: 10.1111/bph.13532] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 05/23/2016] [Accepted: 05/23/2016] [Indexed: 12/16/2022] Open
Abstract
The NADPH oxidase (NOX) family of enzymes produces ROS as their sole function and is becoming recognized as key modulators of signal transduction pathways with a physiological role under acute stress and a pathological role after excessive activation under chronic stress. The seven isoforms differ in their regulation, tissue and subcellular localization and ROS products. The most studied are NOX1, 2 and 4. Genetic deletion of NOX1 and 4, in contrast to NOX2, has revealed no significant spontaneous pathologies and a pathogenic relevance of both NOX1 and 4 across multiple organs in a wide range of diseases and in particular inflammatory and fibrotic diseases. This has stimulated interest in NOX inhibitors for therapeutic application. GKT136901 and GKT137831 are two structurally related compounds demonstrating a preferential inhibition of NOX1 and 4 that have suitable properties for in vivo studies and have consequently been evaluated across a range of disease models and compared with gene deletion. In contrast to gene deletion, these inhibitors do not completely suppress ROS production, maintaining some basal level of ROS. Despite this and consistent with most gene deletion studies, these inhibitors are well tolerated and slow or prevent disease progression in a range of models of chronic inflammatory and fibrotic diseases by modulating common signal transduction pathways. Clinical trials in patients with GKT137831 have demonstrated excellent tolerability and reduction of various markers of chronic inflammation. NOX1/4 inhibition may provide a safe and effective therapeutic strategy for a range of inflammatory and fibrotic diseases. LINKED ARTICLES This article is part of a themed section on Redox Biology and Oxidative Stress in Health and Disease. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v174.12/issuetoc.
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Affiliation(s)
- G Teixeira
- Evotec International GmbHGoettingenGermany
| | | | - S Molango
- Genkyotex SAPlan les OuatesSwitzerland
| | | | - F Heitz
- Genkyotex SAPlan les OuatesSwitzerland
| | - P Wiesel
- Genkyotex SAPlan les OuatesSwitzerland
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67
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Mortadza SS, Sim JA, Stacey M, Jiang LH. Signalling mechanisms mediating Zn 2+-induced TRPM2 channel activation and cell death in microglial cells. Sci Rep 2017; 7:45032. [PMID: 28322340 PMCID: PMC5359577 DOI: 10.1038/srep45032] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 02/20/2017] [Indexed: 01/06/2023] Open
Abstract
Excessive Zn2+ causes brain damage via promoting ROS generation. Here we investigated the role of ROS-sensitive TRPM2 channel in H2O2/Zn2+-induced Ca2+ signalling and cell death in microglial cells. H2O2/Zn2+ induced concentration-dependent increases in cytosolic Ca2+ concentration ([Ca2+]c), which was inhibited by PJ34, a PARP inhibitor, and abolished by TRPM2 knockout (TRPM2-KO). Pathological concentrations of H2O2/Zn2+ induced substantial cell death that was inhibited by PJ34 and DPQ, PARP inhibitors, 2-APB, a TRPM2 channel inhibitor, and prevented by TRPM2-KO. Further analysis indicate that Zn2+ induced ROS production, PARP-1 stimulation, increase in the [Ca2+]c and cell death, all of which were suppressed by chelerythrine, a protein kinase C inhibitor, DPI, a NADPH-dependent oxidase (NOX) inhibitor, GKT137831, a NOX1/4 inhibitor, and Phox-I2, a NOX2 inhibitor. Furthermore, Zn2+-induced PARP-1 stimulation, increase in the [Ca2+]c and cell death were inhibited by PF431396, a Ca2+-sensitive PYK2 inhibitor, and U0126, a MEK/ERK inhibitor. Taken together, our study shows PKC/NOX-mediated ROS generation and PARP-1 activation as an important mechanism in Zn2+-induced TRPM2 channel activation and, TRPM2-mediated increase in the [Ca2+]c to trigger the PYK2/MEK/ERK signalling pathway as a positive feedback mechanism that amplifies the TRPM2 channel activation. Activation of these TRPM2-depenent signalling mechanisms ultimately drives Zn2+-induced Ca2+ overloading and cell death.
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Affiliation(s)
- Sharifah Syed Mortadza
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, United Kingdom
| | - Joan A Sim
- School of Life Sciences, University of Manchester, United Kingdom
| | - Martin Stacey
- School of Molecular and Cell Biology, Faculty of Biological Sciences, University of Leeds, United Kingdom
| | - Lin-Hua Jiang
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, United Kingdom.,Sino-UK Joint Laboratory of Brain Function and Injury, and Department of Physiology and Neurobiology, Xinxiang Medical University, PR China
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68
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Long-Term Effects of Maternal Deprivation on Redox Regulation in Rat Brain: Involvement of NADPH Oxidase. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:7390516. [PMID: 28408971 PMCID: PMC5376945 DOI: 10.1155/2017/7390516] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 02/23/2017] [Accepted: 03/01/2017] [Indexed: 01/16/2023]
Abstract
Maternal deprivation (MD) causes perinatal stress, with subsequent behavioral changes which resemble the symptoms of schizophrenia. The NADPH oxidase is one of the major generators of reactive oxygen species, known to play a role in stress response in different tissues. The aim of this study was to elucidate the long-term effects of MD on the expression of NADPH oxidase subunits (gp91phox, p22phox, p67phox, p47phox, and p40phox). Activities of cytochrome C oxidase and respiratory chain Complex I, as well as the oxidative stress parameters using appropriate spectrophotometric techniques were analyzed. Nine-day-old Wistar rats were exposed to a 24 h maternal deprivation and sacrificed at young adult age. The structures affected by perinatal stress, cortex, hippocampus, thalamus, and caudate nuclei were investigated. The most prominent findings were increased expressions of gp91phox in the cortex and hippocampus, increased expression of p22phox and p40phox, and decreased expression of gp91phox, p22phox, and p47phox in the caudate nuclei. Complex I activity was increased in all structures except cortex. Content of reduced glutathione was decreased in all sections while region-specific changes of other oxidative stress parameters were found. Our results indicate the presence of long-term redox alterations in MD rats.
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69
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Zeng Y, Shen Y, Hong L, Chen Y, Shi X, Zeng Q, Yu P. Effects of Single and Repeated Exposure to a 50-Hz 2-mT Electromagnetic Field on Primary Cultured Hippocampal Neurons. Neurosci Bull 2017; 33:299-306. [PMID: 28265899 DOI: 10.1007/s12264-017-0113-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Accepted: 01/10/2017] [Indexed: 11/29/2022] Open
Abstract
The prevalence of domestic and industrial electrical appliances has raised concerns about the health risk of extremely low-frequency magnetic fields (ELF-MFs). At present, the effects of ELF-MFs on the central nervous system are still highly controversial, and few studies have investigated its effects on cultured neurons. Here, we evaluated the biological effects of different patterns of ELF-MF exposure on primary cultured hippocampal neurons in terms of viability, apoptosis, genomic instability, and oxidative stress. The results showed that repeated exposure to 50-Hz 2-mT ELF-MF for 8 h per day after different times in culture decreased the viability and increased the production of intracellular reactive oxidative species in hippocampal neurons. The mechanism was potentially related to the up-regulation of Nox2 expression. Moreover, none of the repeated exposure patterns had significant effects on DNA damage, apoptosis, or autophagy, which suggested that ELF-MF exposure has no severe biological consequences in cultured hippocampal neurons.
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Affiliation(s)
- Ying Zeng
- Bioelectromagnetics Laboratory, Department of Occupational and Environmental Health, School of Public Health, Zhejiang University, Hangzhou, 310058, China
| | - Yunyun Shen
- Bioelectromagnetics Laboratory, Department of Occupational and Environmental Health, School of Public Health, Zhejiang University, Hangzhou, 310058, China.,Institute of Cognitive Neuroscience and Department of Psychology, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Ling Hong
- Bioelectromagnetics Laboratory, Department of Occupational and Environmental Health, School of Public Health, Zhejiang University, Hangzhou, 310058, China
| | - Yanfeng Chen
- Bioelectromagnetics Laboratory, Department of Occupational and Environmental Health, School of Public Health, Zhejiang University, Hangzhou, 310058, China
| | - Xiaofang Shi
- Department of Neurobiology, Zhejiang University School of Medicine, Hangzhou, 310058, China
| | - Qunli Zeng
- Bioelectromagnetics Laboratory, Department of Occupational and Environmental Health, School of Public Health, Zhejiang University, Hangzhou, 310058, China.
| | - Peilin Yu
- Department of Toxicology, School of Public Health, Zhejiang University, Hangzhou, 310058, China.
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70
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von Leden RE, Yauger YJ, Khayrullina G, Byrnes KR. Central Nervous System Injury and Nicotinamide Adenine Dinucleotide Phosphate Oxidase: Oxidative Stress and Therapeutic Targets. J Neurotrauma 2017; 34:755-764. [PMID: 27267366 PMCID: PMC5335782 DOI: 10.1089/neu.2016.4486] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Injury to the central nervous system (CNS) includes both traumatic brain and spinal cord injury (TBI and SCI, respectively). These injuries, which are heterogeneous and, therefore, difficult to treat, result in long-lasting functional, cognitive, and behavioral deficits. Severity of injury is determined by multiple factors, and is largely mediated by the activity of the CNS inflammatory system, including the primary CNS immune cells, microglia. The nicotinamide adenine dinucleotide phosphate (NADPH) oxidase (NOX) family of enzymes is a primary source of reactive oxygen species (ROS), key inflammatory mediators after CNS injury. ROS play a central role in inflammation, contributing to cytokine translation and release, microglial polarization and activation, and clearance of damaged tissue. NOX has been suggested as a potential therapeutic target in CNS trauma, as inhibition of this enzyme family modulates inflammatory cell response and ROS production. The purpose of this review is to understand how the different NOX enzymes function and what role they play in the scope of CNS trauma.
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Affiliation(s)
| | - Young J. Yauger
- Neuroscience Program, Uniformed Services University, Bethesda, Maryland
| | - Guzal Khayrullina
- Department of Anatomy, Physiology, and Genetics, Uniformed Services University, Bethesda, Maryland
| | - Kimberly R. Byrnes
- Neuroscience Program, Uniformed Services University, Bethesda, Maryland
- Department of Anatomy, Physiology, and Genetics, Uniformed Services University, Bethesda, Maryland
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71
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Ma MW, Wang J, Zhang Q, Wang R, Dhandapani KM, Vadlamudi RK, Brann DW. NADPH oxidase in brain injury and neurodegenerative disorders. Mol Neurodegener 2017; 12:7. [PMID: 28095923 PMCID: PMC5240251 DOI: 10.1186/s13024-017-0150-7] [Citation(s) in RCA: 292] [Impact Index Per Article: 41.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Accepted: 01/05/2017] [Indexed: 12/11/2022] Open
Abstract
Oxidative stress is a common denominator in the pathology of neurodegenerative disorders such as Alzheimer’s disease, Parkinson’s disease, Huntington’s disease, amyotrophic lateral sclerosis, and multiple sclerosis, as well as in ischemic and traumatic brain injury. The brain is highly vulnerable to oxidative damage due to its high metabolic demand. However, therapies attempting to scavenge free radicals have shown little success. By shifting the focus to inhibit the generation of damaging free radicals, recent studies have identified NADPH oxidase as a major contributor to disease pathology. NADPH oxidase has the primary function to generate free radicals. In particular, there is growing evidence that the isoforms NOX1, NOX2, and NOX4 can be upregulated by a variety of neurodegenerative factors. The majority of recent studies have shown that genetic and pharmacological inhibition of NADPH oxidase enzymes are neuroprotective and able to reduce detrimental aspects of pathology following ischemic and traumatic brain injury, as well as in chronic neurodegenerative disorders. This review aims to summarize evidence supporting the role of NADPH oxidase in the pathology of these neurological disorders, explores pharmacological strategies of targeting this major oxidative stress pathway, and outlines obstacles that need to be overcome for successful translation of these therapies to the clinic.
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Affiliation(s)
- Merry W Ma
- Charlie Norwood VA Medical Center, One Freedom Way, Augusta, GA, 30904, USA.,Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, 1120 Fifteenth Street, Augusta, GA, 30912, USA
| | - Jing Wang
- Charlie Norwood VA Medical Center, One Freedom Way, Augusta, GA, 30904, USA.,Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, 1120 Fifteenth Street, Augusta, GA, 30912, USA
| | - Quanguang Zhang
- Charlie Norwood VA Medical Center, One Freedom Way, Augusta, GA, 30904, USA.,Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, 1120 Fifteenth Street, Augusta, GA, 30912, USA
| | - Ruimin Wang
- Charlie Norwood VA Medical Center, One Freedom Way, Augusta, GA, 30904, USA.,Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, 1120 Fifteenth Street, Augusta, GA, 30912, USA
| | - Krishnan M Dhandapani
- Charlie Norwood VA Medical Center, One Freedom Way, Augusta, GA, 30904, USA.,Department of Neurosurgery, Medical College of Georgia, Augusta University, 1120 Fifteenth Street, Augusta, GA, 30912, USA
| | - Ratna K Vadlamudi
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, 7703 Medical Drive, San Antonio, TX, 78229, USA
| | - Darrell W Brann
- Charlie Norwood VA Medical Center, One Freedom Way, Augusta, GA, 30904, USA. .,Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, 1120 Fifteenth Street, Augusta, GA, 30912, USA.
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72
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Basic Fibroblast Growth Factor Inhibits Apoptosis and Promotes Proliferation of Adipose-Derived Mesenchymal Stromal Cells Isolated from Patients with Type 2 Diabetes by Reducing Cellular Oxidative Stress. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:3027109. [PMID: 28168007 PMCID: PMC5267085 DOI: 10.1155/2017/3027109] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 12/15/2016] [Indexed: 01/09/2023]
Abstract
Type 2 diabetes (T2D) is a chronic metabolic disorder affecting increasing number of people in developed countries. Therefore new strategies for treatment of T2D and its complications are of special interest. Nowadays, cellular therapies involving mesenchymal stromal cells that reside in adipose tissue (ASCs) constitute a promising approach; however, there are still many obstacles concerning safety and effectiveness that need to be overcome before ASCs could be engaged for the treatment of diabetes mellitus. One of the challenges is preventing ASCs from deterioration caused by elevated oxidative stress present in diabetes milieu. In the current study we investigated the effect of basic fibroblast growth factor (bFGF) treatment on ASCs isolated from patients with diagnosed T2D. We demonstrate here that cell exposition to bFGF in 5 and 10 ng/mL dosages results in improved morphology, increased proliferative activity, reduced cellular senescence and apoptosis, and decreased oxidative stress, indicating recovery of ASCs' function impaired by T2D. Therefore our results provide a support for bFGF as a potential therapeutic agent for improving stem cell-based approaches for the treatment of diabetes mellitus and its complications.
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73
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Bonaventura A, Liberale L, Vecchié A, Casula M, Carbone F, Dallegri F, Montecucco F. Update on Inflammatory Biomarkers and Treatments in Ischemic Stroke. Int J Mol Sci 2016; 17:1967. [PMID: 27898011 PMCID: PMC5187767 DOI: 10.3390/ijms17121967] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 11/08/2016] [Accepted: 11/17/2016] [Indexed: 12/26/2022] Open
Abstract
After an acute ischemic stroke (AIS), inflammatory processes are able to concomitantly induce both beneficial and detrimental effects. In this narrative review, we updated evidence on the inflammatory pathways and mediators that are investigated as promising therapeutic targets. We searched for papers on PubMed and MEDLINE up to August 2016. The terms searched alone or in combination were: ischemic stroke, inflammation, oxidative stress, ischemia reperfusion, innate immunity, adaptive immunity, autoimmunity. Inflammation in AIS is characterized by a storm of cytokines, chemokines, and Damage-Associated Molecular Patterns (DAMPs) released by several cells contributing to exacerbate the tissue injury both in the acute and reparative phases. Interestingly, many biomarkers have been studied, but none of these reflected the complexity of systemic immune response. Reperfusion therapies showed a good efficacy in the recovery after an AIS. New therapies appear promising both in pre-clinical and clinical studies, but still need more detailed studies to be translated in the ordinary clinical practice. In spite of clinical progresses, no beneficial long-term interventions targeting inflammation are currently available. Our knowledge about cells, biomarkers, and inflammatory markers is growing and is hoped to better evaluate the impact of new treatments, such as monoclonal antibodies and cell-based therapies.
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Affiliation(s)
- Aldo Bonaventura
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy.
| | - Luca Liberale
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy.
| | - Alessandra Vecchié
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy.
| | - Matteo Casula
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy.
| | - Federico Carbone
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy.
| | - Franco Dallegri
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy.
- IRCCS Azienda Ospedaliera Universitaria San Martino-IST Istituto Nazionale per la Ricerca sul Cancro, Genova, 10 Largo Benzi, 16132 Genoa, Italy.
| | - Fabrizio Montecucco
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy.
- IRCCS Azienda Ospedaliera Universitaria San Martino-IST Istituto Nazionale per la Ricerca sul Cancro, Genova, 10 Largo Benzi, 16132 Genoa, Italy.
- Centre of Excellence for Biomedical Research (CEBR), University of Genoa, 9 viale Benedetto XV, 16132 Genoa, Italy.
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74
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Bermudez S, Khayrullina G, Zhao Y, Byrnes KR. NADPH oxidase isoform expression is temporally regulated and may contribute to microglial/macrophage polarization after spinal cord injury. Mol Cell Neurosci 2016; 77:53-64. [PMID: 27729244 DOI: 10.1016/j.mcn.2016.10.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 08/29/2016] [Accepted: 10/05/2016] [Indexed: 12/30/2022] Open
Abstract
Spinal cord injury (SCI) results in both acute and chronic inflammation, as a result of activation of microglia, invasion of macrophages and activation of the NADPH oxidase (NOX) enzyme. The NOX enzyme is a primary source of reactive oxygen species (ROS) and is expressed by microglia and macrophages after SCI. These cells can assume either a pro- (M1) or anti-inflammatory (M2) polarization phenotype and contribute to tissue response to SCI. However, the contribution of NOX expression and ROS production to this polarization and vice versa is currently undefined. We therefore investigated the impact of SCI on NOX expression and microglial/macrophage polarization over time in a mouse model of contusion injury. Adult C57Bl/6 mice were exposed to a moderate T9 contusion SCI and tissue was assessed at acute, sub-acute and chronic time points for NOX isoform expression and co-expression with M1 and M2 microglia/macrophage polarization markers. Two NOX isoforms were increased after injury and were associated with both M1 and M2 markers, with an M1 preference for NOX2 acutely and NOX4 chronically. M2 cells were primarily found at acute time points only; the peak of NOX2 expression was associated with the decline in M2 polarization. In vitro, NOX2 inhibition shifted microglial polarization toward the M2 phenotype. These results now show that microglial/macrophage expression of NOX isoforms is independent of polarization state, but that NOX activity can influence subsequent polarization. These data can contribute to the therapeutic targeting of NOX as a therapy for SCI.
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Affiliation(s)
- Sara Bermudez
- Anatomy, Physiology and Genetics Department, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD 20814, USA.
| | - Guzal Khayrullina
- Anatomy, Physiology and Genetics Department, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD 20814, USA.
| | - Yujia Zhao
- Anatomy, Physiology and Genetics Department, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD 20814, USA.
| | - Kimberly R Byrnes
- Anatomy, Physiology and Genetics Department, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD 20814, USA.
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Binding of EBP50 to Nox organizing subunit p47phox is pivotal to cellular reactive species generation and altered vascular phenotype. Proc Natl Acad Sci U S A 2016; 113:E5308-17. [PMID: 27540115 DOI: 10.1073/pnas.1514161113] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Despite numerous reports implicating NADPH oxidases (Nox) in the pathogenesis of many diseases, precise regulation of this family of professional reactive oxygen species (ROS) producers remains unclear. A unique member of this family, Nox1 oxidase, functions as either a canonical or hybrid system using Nox organizing subunit 1 (NoxO1) or p47(phox), respectively, the latter of which is functional in vascular smooth muscle cells (VSMC). In this manuscript, we identify critical requirement of ezrin-radixin-moesin-binding phosphoprotein 50 (EBP50; aka NHERF1) for Nox1 activation and downstream responses. Superoxide (O2 (•-)) production induced by angiotensin II (AngII) was absent in mouse EBP50 KO VSMC vs. WT. Moreover, ex vivo incubation of aortas with AngII showed a significant increase in O2 (•-) in WT but not EBP50 or Nox1 nulls. Similarly, lipopolysaccharide (LPS)-induced oxidative stress was attenuated in femoral arteries from EBP50 KO vs. WT. In silico analyses confirmed by confocal microscopy, immunoprecipitation, proximity ligation assay, FRET, and gain-/loss-of-function mutagenesis revealed binding of EBP50, via its PDZ domains, to a specific motif in p47(phox) Functional studies revealed AngII-induced hypertrophy was absent in EBP50 KOs, and in VSMC overexpressing EBP50, Nox1 gene silencing abolished VSMC hypertrophy. Finally, ex vivo measurement of lumen diameter in mouse resistance arteries exhibited attenuated AngII-induced vasoconstriction in EBP50 KO vs. WT. Taken together, our data identify EBP50 as a previously unidentified regulator of Nox1 and support that it promotes Nox1 activity by binding p47(phox) This interaction is pivotal for agonist-induced smooth muscle ROS, hypertrophy, and vasoconstriction and has implications for ROS-mediated physiological and pathophysiological processes.
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76
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Begieneman MPV, Ter Horst EN, Rijvers L, Meinster E, Leen R, Pankras JE, Fritz J, Kubat B, Musters RJP, van Kuilenburg ABP, Stap J, Niessen HWM, Krijnen PAJ. Dopamine induces lipid accumulation, NADPH oxidase-related oxidative stress, and a proinflammatory status of the plasma membrane in H9c2 cells. Am J Physiol Heart Circ Physiol 2016; 311:H1097-H1107. [PMID: 27521422 DOI: 10.1152/ajpheart.00633.2015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 07/15/2016] [Indexed: 01/08/2023]
Abstract
Excess catecholamine levels are suggested to be cardiotoxic and to underlie stress-induced heart failure. The cardiotoxic effects of norepinephrine and epinephrine are well recognized. However, although cardiac and circulating dopamine levels are also increased in stress cardiomyopathy patients, knowledge regarding putative toxic effects of excess dopamine levels on cardiomyocytes is scarce. We now studied the effects of elevated dopamine levels in H9c2 cardiomyoblasts. H9c2 cells were cultured and treated with dopamine (200 μM) for 6, 24, and 48 h. Subsequently, the effects on lipid accumulation, cell viability, flippase activity, reactive oxygen species (ROS) production, subcellular NADPH oxidase (NOX) protein expression, and ATP/ADP and GTP/GDP levels were analyzed. Dopamine did not result in cytotoxic effects after 6 h. However, after 24 and 48 h dopamine treatment induced a significant increase in lipid accumulation, nitrotyrosine levels, indicative of ROS production, and cell death. In addition, dopamine significantly reduced flippase activity and ATP/GTP levels, coinciding with phosphatidylserine exposure on the outer plasma membrane. Furthermore, dopamine induced a transient increase in cytoplasmic and (peri)nucleus NOX1 and NOX4 expression after 24 h that subsided after 48 h. Moreover, while dopamine induced a similar transient increase in cytoplasmic NOX2 and p47phox expression, in the (peri)nucleus this increased expression persisted for 48 h where it colocalized with ROS. Exposure of H9c2 cells to elevated dopamine levels induced lipid accumulation, oxidative stress, and a proinflammatory status of the plasma membrane. This can, in part, explain the inflammatory response in patients with stress-induced heart failure.
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Affiliation(s)
- Mark P V Begieneman
- Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands; .,Netherlands Forensic Institute, The Hague, the Netherlands.,Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, the Netherlands
| | - Ellis N Ter Horst
- Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands.,Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, the Netherlands.,Interuniversity Cardiology Institute of the Netherlands, Utrecht, the Netherlands
| | - Liza Rijvers
- Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands
| | - Elisa Meinster
- Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands
| | - René Leen
- Laboratory Genetic Metabolic Diseases and Department of Pediatrics/Emma's Children Hospital, Academic Medical Center Amsterdam, Amsterdam, the Netherlands
| | - Jeannette E Pankras
- Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands
| | - Jan Fritz
- Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands
| | - Bela Kubat
- Netherlands Forensic Institute, The Hague, the Netherlands.,Department of Pathology, Maastricht University Medical Center, Maastricht, the Netherlands
| | - René J P Musters
- Department of Physiology, VU University Medical Center, Amsterdam, the Netherlands
| | | | - Jan Stap
- Core Facility Cellular Imaging/LCAM-AMC, Amsterdam, the Netherlands; and
| | - Hans W M Niessen
- Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands.,Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, the Netherlands.,Department of Cardiothoracic Surgery, VU University Medical Center, Amsterdam, the Netherlands
| | - Paul A J Krijnen
- Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands.,Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, the Netherlands
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77
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Sepulveda-Diaz JE, Ouidja MO, Socias SB, Hamadat S, Guerreiro S, Raisman-Vozari R, Michel PP. A simplified approach for efficient isolation of functional microglial cells: Application for modeling neuroinflammatory responsesin vitro. Glia 2016; 64:1912-24. [DOI: 10.1002/glia.23032] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 05/24/2016] [Accepted: 06/30/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Julia E. Sepulveda-Diaz
- Institut National De La Santé Et De La Recherche Médicale, U 1127, CNRS, Unité Mixte De Recherche (UMR) 7225, Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, Institut Du Cerveau Et De La Moelle Epinière, ICM; Paris France
| | - Mohand O. Ouidja
- Laboratoire Croissance, Régénération, Réparation Et Régénération Tissulaires (CRRET)/EAC CNRS 7149, Université Paris Est Créteil, Université Paris Est; Créteil France
| | - Sergio B. Socias
- Institut National De La Santé Et De La Recherche Médicale, U 1127, CNRS, Unité Mixte De Recherche (UMR) 7225, Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, Institut Du Cerveau Et De La Moelle Epinière, ICM; Paris France
- Facultad De Bioquímica, Química Y Farmacia (UNT), Instituto Superior De Investigaciones Biológicas, INSIBIO (CONICET-UNT) and Instituto De Química Biológica “Dr Bernabé Bloj,”; Tucumán Argentina
| | - Sabah Hamadat
- Institut National De La Santé Et De La Recherche Médicale, U 1127, CNRS, Unité Mixte De Recherche (UMR) 7225, Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, Institut Du Cerveau Et De La Moelle Epinière, ICM; Paris France
| | - Serge Guerreiro
- Institut National De La Santé Et De La Recherche Médicale, U 1127, CNRS, Unité Mixte De Recherche (UMR) 7225, Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, Institut Du Cerveau Et De La Moelle Epinière, ICM; Paris France
| | - Rita Raisman-Vozari
- Institut National De La Santé Et De La Recherche Médicale, U 1127, CNRS, Unité Mixte De Recherche (UMR) 7225, Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, Institut Du Cerveau Et De La Moelle Epinière, ICM; Paris France
| | - Patrick P. Michel
- Institut National De La Santé Et De La Recherche Médicale, U 1127, CNRS, Unité Mixte De Recherche (UMR) 7225, Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, Institut Du Cerveau Et De La Moelle Epinière, ICM; Paris France
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78
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Ray RS, Katyal A. Myeloperoxidase: Bridging the gap in neurodegeneration. Neurosci Biobehav Rev 2016; 68:611-620. [PMID: 27343997 DOI: 10.1016/j.neubiorev.2016.06.031] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 06/20/2016] [Accepted: 06/21/2016] [Indexed: 10/21/2022]
Abstract
Neurodegenerative conditions present a group of complex disease pathologies mostly due to unknown aetiology resulting in neuronal death and permanent neurological disability. Any undesirable stress to the brain, disrupts homeostatic balance, through a remarkable convergence of pathophysiological changes and immune dysregulation. The crosstalk between inflammatory and oxidative mechanisms results in the release of neurotoxic mediators apparently spearheaded by myeloperoxidase derived from activated microglia, astrocytes, neurons as well as peripheral inflammatory cells. These isolated entities combinedly have the potential to flare up and contribute significantly to neuropathology and disease progression. Recent, clinicopathological evidence support the association of myeloperoxidase and its cytotoxic product, hypochlorous acid in a plethora of neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, Amyotrophic lateral sclerosis, Multiple sclerosis, Stroke, Epilepsy etc. But the biochemical and mechanistic insights into myeloperoxidase mediated neuroinflammation and neuronal death is still an uncharted territory. The current review outlines the emerging recognition of myeloperoxidase in neurodegeneration, which may offer novel therapeutic and diagnostic targets for neurodegenerative disorders.
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Affiliation(s)
- R S Ray
- Dr. B.R. Ambedkar Center for Biomedical Research (ACBR), University of Delhi, North Campus, Delhi 110 007, India.
| | - Anju Katyal
- Dr. B.R. Ambedkar Center for Biomedical Research (ACBR), University of Delhi, North Campus, Delhi 110 007, India.
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Xu J, Wang W, Zhong XX, Feng YW, Wei XH, Liu XG. EXPRESS: Methylcobalamin ameliorates neuropathic pain induced by vincristine in rats: Effect on loss of peripheral nerve fibers and imbalance of cytokines in the spinal dorsal horn. Mol Pain 2016; 12:12/0/1744806916657089. [PMID: 27306413 PMCID: PMC4956006 DOI: 10.1177/1744806916657089] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Background Vincristine, a widely used chemotherapeutic agent, often induces painful peripheral neuropathy and there are currently no effective drugs to prevent or treat this side effect. Previous studies have shown that methylcobalamin has potential analgesic effect in diabetic and chronic compression of dorsal root ganglion model; however, whether methylcobalamin has effect on vincristine-induced painful peripheral neuropathy is still unknown. Results We found that vincristine-induced mechanical allodynia and thermal hyperalgesia, accompanied by a significant loss of intraepidermal nerve fibers in the plantar hind paw skin and an increase in the incidence of atypical mitochondria in the sciatic nerve. Moreover, in the spinal dorsal horn, the activity of nicotinamide adenine dinucleotide phosphate (NADPH) oxidase and the protein expression of p-p65 as well as tumor necrosis factor α was increased, whereas the protein expression of IL-10 was decreased following vincristine treatment. Furthermore, intraperitoneal injection of methylcobalamin could dose dependently attenuate vincristine-induced mechanical allodynia and thermal hyperalgesia, which was associated with intraepidermal nerve fibers rescue, and atypical mitochondria prevalence decrease in the sciatic nerve. Moreover, methylcobalamin inhibited the activation of NADPH oxidase and the downstream NF-κB pathway. Production of tumor necrosis factor α was also decreased and production of IL-10 was increased in the spinal dorsal horn following methylcobalamin treatment. Intrathecal injection of Phorbol-12-Myristate-13-Acetate, a NADPH oxidase activator, could completely block the analgesic effect of methylcobalamin. Conclusions Methylcobalamin attenuated vincrinstine-induced neuropathic pain, which was accompanied by inhibition of intraepidermal nerve fibers loss and mitochondria impairment. Inhibiting the activation of NADPH oxidase and the downstream NF-κB pathway, resulting in the rebalancing of proinflammatory and anti-inflammatory cytokines in the spinal dorsal horn might also be involved. These findings might provide potential target for preventing vincristine-induced neuropathic pain.
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Affiliation(s)
- Jing Xu
- Department of Physiology, Pain Research Center, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Wei Wang
- Department of Physiology, Pain Research Center, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Xiong-Xiong Zhong
- Department of Physiology, Pain Research Center, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Yi-Wei Feng
- Department of Physiology, Pain Research Center, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Xu-Hong Wei
- Department of Physiology, Pain Research Center, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Guangzhou, China
- Xu-Hong Wei, Zhongshan School of Medicine of Sun Yat-sen University, Guangzhou, China. Xian-Guo Liu, Zhongshan School of Medicine of Sun Yat-sen University, Guangzhou, China.
| | - Xian-Guo Liu
- Department of Physiology, Pain Research Center, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Guangzhou, China
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80
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Rocha SM, Saraiva T, Cristóvão AC, Ferreira R, Santos T, Esteves M, Saraiva C, Je G, Cortes L, Valero J, Alves G, Klibanov A, Kim YS, Bernardino L. Histamine induces microglia activation and dopaminergic neuronal toxicity via H1 receptor activation. J Neuroinflammation 2016; 13:137. [PMID: 27260166 PMCID: PMC4893260 DOI: 10.1186/s12974-016-0600-0] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Accepted: 05/26/2016] [Indexed: 12/13/2022] Open
Abstract
Background Histamine is an amine widely known as a peripheral inflammatory mediator and as a neurotransmitter in the central nervous system. Recently, it has been suggested that histamine acts as an innate modulator of microglial activity. Herein, we aimed to disclose the role of histamine in microglial phagocytic activity and reactive oxygen species (ROS) production and to explore the consequences of histamine-induced neuroinflammation in dopaminergic (DA) neuronal survival. Methods The effect of histamine on phagocytosis was assessed both in vitro by using a murine N9 microglial cell line and primary microglial cell cultures and in vivo. Cells were exposed to IgG-opsonized latex beads or phosphatidylserine (PS) liposomes to evaluate Fcγ or PS receptor-mediated microglial phagocytosis, respectively. ROS production and protein levels of NADPH oxidases and Rac1 were assessed as a measure of oxidative stress. DA neuronal survival was evaluated in vivo by counting the number of tyrosine hydroxylase-positive neurons in the substantia nigra (SN) of mice. Results We found that histamine triggers microglial phagocytosis via histamine receptor 1 (H1R) activation and ROS production via H1R and H4R activation. By using apocynin, a broad NADPH oxidase (Nox) inhibitor, and Nox1 knockout mice, we found that the Nox1 signaling pathway is involved in both phagocytosis and ROS production induced by histamine in vitro. Interestingly, both apocynin and annexin V (used as inhibitor of PS-induced phagocytosis) fully abolished the DA neurotoxicity induced by the injection of histamine in the SN of adult mice in vivo. Blockade of H1R protected against histamine-induced Nox1 expression and death of DA neurons in vivo. Conclusions Overall, our results highlight the relevance of histamine in the modulation of microglial activity that ultimately may interfere with neuronal survival in the context of Parkinson’s disease (PD) and, eventually, other neurodegenerative diseases which are accompanied by microglia-induced neuroinflammation. Importantly, our results also open promising new perspectives for the therapeutic use of H1R antagonists to treat or ameliorate neurodegenerative processes. Electronic supplementary material The online version of this article (doi:10.1186/s12974-016-0600-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Sandra M Rocha
- Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal
| | - Tatiana Saraiva
- Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal
| | - Ana C Cristóvão
- Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal
| | - Raquel Ferreira
- Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal
| | - Tiago Santos
- Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal
| | - Marta Esteves
- Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal
| | - Cláudia Saraiva
- Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal
| | - Goun Je
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL, USA
| | - Luísa Cortes
- Center for Neuroscience and Cell Biology, Coimbra, Portugal
| | - Jorge Valero
- Center for Neuroscience and Cell Biology, Coimbra, Portugal
| | - Gilberto Alves
- Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal
| | - Alexander Klibanov
- Division of Cardiovascular Medicine and Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, USA
| | - Yoon-Seong Kim
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL, USA
| | - Liliana Bernardino
- Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal. .,Health Sciences Research Centre, University of Beira Interior, Av. Infante D. Henrique, 6200-506, Covilhã, Portugal.
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81
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Ahn SH, Song JE, Kim S, Cho SH, Lim YK, Kook JK, Kook MS, Lee TH. NOX1/2 activation in human gingival fibroblasts by Fusobacterium nucleatum facilitates attachment of Porphyromonas gingivalis. Arch Microbiol 2016; 198:573-83. [PMID: 27071620 DOI: 10.1007/s00203-016-1223-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 03/22/2016] [Accepted: 04/06/2016] [Indexed: 10/22/2022]
Abstract
Periodontal diseases are infectious polymicrobial inflammatory diseases that lead to destruction of the periodontal ligament, gingiva, and alveolar bone. Sequential colonization of a broad range of bacteria, including Fusobacterium nucleatum and Porphyromonas gingivalis, is an important phenomenon in this disease model. F. nucleatum is a facultative anaerobic species thought to be a key mediator of dental plaque maturation due to its extensive coaggregation with other oral bacteria, while P. gingivalis is an obligate anaerobic species that induces gingival inflammation by secreting various virulence factors. The formation of a bacterial complex by these two species is central to the pathogenesis of periodontal disease. Reactive oxygen species (ROS) are produced during bacterial infections and are involved in intracellular signaling. However, the impact of oral bacteria-induced ROS on the ecology of F. nucleatum and P. gingivalis has yet to be clarified. In the present study, we investigated ROS production induced in primary human oral cells by F. nucleatum and P. gingivalis and its effect on the formation of their bacterial complexes and further host cell apoptosis. We found that in primary human gingival fibroblasts (GFs), two NADPH oxidase isoforms, NOX1 and NOX2, were activated in response to F. nucleatum infection but not P. gingivalis infection. Accordingly, increased NADPH oxidase activity and production of superoxide anion were observed in GFs after F. nucleatum infection, but not after P. gingivalis infection. Interestingly, in NOX1, NOX2, or NOX1/NOX2 knockdown cells, the number of P. gingivalis decreased when the cells were coinfected with F. nucleatum. A similar pattern of host cell apoptosis was observed. This implies that F. nucleatum contributes to attachment of P. gingivalis by triggering activation of NADPH oxidase in host cells, which may provide an environment more favorable to strict anaerobic bacteria and have a subsequent effect on apoptosis of host cells.
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Affiliation(s)
- Sun Hee Ahn
- Department of Oral Biochemistry, Dental Science Research Institute, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Ji-Eun Song
- Department of Molecular Medicine (BK21plus), Graduate School, Chonnam National University, Gwangju, Republic of Korea
| | - Suhee Kim
- Department of Molecular Medicine (BK21plus), Graduate School, Chonnam National University, Gwangju, Republic of Korea
| | - Sung-Hyun Cho
- Department of Molecular Medicine (BK21plus), Graduate School, Chonnam National University, Gwangju, Republic of Korea
| | - Yun Kyong Lim
- Department of Oral Biochemistry, School of Dentistry, Chosun University, Gwangju, Republic of Korea
| | - Joong-Ki Kook
- Department of Oral Biochemistry, School of Dentistry, Chosun University, Gwangju, Republic of Korea
| | - Min-Suk Kook
- Department of Oral and Maxillofacial Surgery, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Tae-Hoon Lee
- Department of Oral Biochemistry, Dental Science Research Institute, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea. .,Department of Molecular Medicine (BK21plus), Graduate School, Chonnam National University, Gwangju, Republic of Korea.
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82
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Sirokmány G, Donkó Á, Geiszt M. Nox/Duox Family of NADPH Oxidases: Lessons from Knockout Mouse Models. Trends Pharmacol Sci 2016; 37:318-327. [DOI: 10.1016/j.tips.2016.01.006] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 11/21/2015] [Accepted: 01/11/2016] [Indexed: 02/07/2023]
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83
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Siddiqui TA, Lively S, Schlichter LC. Complex molecular and functional outcomes of single versus sequential cytokine stimulation of rat microglia. J Neuroinflammation 2016; 13:66. [PMID: 27009332 PMCID: PMC4806433 DOI: 10.1186/s12974-016-0531-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 03/16/2016] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Microglia are the "professional" phagocytes of the CNS. Phagocytosis is crucial for normal CNS development and maintenance, but it can be either beneficial or detrimental after injury or disease. For instance, white matter damage releases myelin debris that must be cleared by microglia in order for re-myelination to occur. However, phagocytosis can also produce damaging reactive oxygen species (ROS). Furthermore, microglia can acquire pro-inflammatory (M1) or anti-inflammatory (M2) activation states that affect cell functions. Although microglia are exposed to a changing cytokine environment after injury or disease, little is known about the molecular and functional consequences. Therefore, we applied several microglial activation paradigms, with or without myelin debris. We assessed (i) gene expression changes reflecting microglial activation and inflammatory states, and receptors and enzymes related to phagocytosis and ROS production, (ii) myelin phagocytosis and production of ROS, and (iii) expression and contributions of several ion channels that are considered potential targets for regulating microglial behavior. METHODS Primary rat microglia were exposed to cytokines, individually or sequentially. First, responses to individual M1 or M2 stimuli were compared: IFN-γ plus TNF-α ("I + T"; M1 activation), interleukin-4 (M2a/alternative activation), and interleukin-10 (M2c/acquired deactivation). Second, sequential cytokine addition was used to assess microglia repolarization and cell functions. The paradigms were M2a→M1, M2c→M1, M1→M2a, and M1→M2c. RESULTS M1 stimulation increased pro-inflammatory genes, phagocytosis, and ROS, as well as expression of Kv1.3, KCa3.1, and Kir2.1 channels. M2a stimulation increased anti-inflammatory genes, ROS production, and Kv1.3 and KCa3.1 expression. Myelin phagocytosis enhanced the M1 profile and dampened the M2a profile, and both phagocytosis and ROS production were dependent on NOX enzymes and Kir2.1 and CRAC channels. Importantly, microglia showed some capacity for re-polarization between M1 and M2a states, based on gene expression changes, myelin phagocytosis, and ROS production. CONCLUSIONS In response to polarizing and re-polarizing cytokine treatments, microglia display complex changes in gene transcription profiles, phagocytic capacity, NOX-mediated ROS production, and in ion channels involved in microglial activation. Because these changes might affect microglia-mediated CNS inflammation, they should be considered in future experimental, pre-clinical studies.
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Affiliation(s)
- Tamjeed A Siddiqui
- Genes and Development Division, Krembil Research Institute, University Health Network, Toronto, Ontario, M5T 2S8, Canada.,Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | - Starlee Lively
- Genes and Development Division, Krembil Research Institute, University Health Network, Toronto, Ontario, M5T 2S8, Canada
| | - Lyanne C Schlichter
- Genes and Development Division, Krembil Research Institute, University Health Network, Toronto, Ontario, M5T 2S8, Canada. .,Department of Physiology, University of Toronto, Toronto, Ontario, Canada. .,Krembil Discovery Tower, Krembil Research Institute, Room 7KD-417, 60 Leonard Street, Toronto, Ontario, M5T 2S8, Canada.
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Naringin inhibits lipopolysaccharide-induced damage in human umbilical vein endothelial cells via attenuation of inflammation, apoptosis and MAPK pathways. Cytotechnology 2016; 68:1473-87. [PMID: 27006302 DOI: 10.1007/s10616-015-9908-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 07/30/2015] [Indexed: 12/21/2022] Open
Abstract
Endothelial cell activation, injury and dysfunction have been regarded as one of the initial key events in the pathogenesis of atherosclerosis. Lipopolysaccharide (LPS), an important mediator of inflammation, can cause endothelial cell damage and apoptosis. Naringin (Nar), one major flavanone glycoside from citrus fruits, shows various pharmacological actions, but the effect of Nar on LPS-induced damage in human umbilical vein endothelial cells (HUVECs) remains unknown. The present results showed that Nar significantly improved the survival rate of HUVECs, and decreased reactive oxygen species and intracellular Ca(2+) levels caused by LPS compared with model group. In addition, Nar obviously decreased cytochrome c release from mitochondria into cytosol. Moreover, Nar significantly down-regulated the protein or mRNA levels of IL-1, IL-6, TNF-α, VCAM-1, ICAM-1, NF-κB, AP-1, cleaved-3,-7,-9, p53, Bak and Bax, and up-regulated the expressions of Bcl-xl, Bcl-2 to suppress inflammation and apoptosis. Furthermore, Nar obviously inhibited phosphorylation levels of JNK, ERK and p38 MAPK. In conclusion, Nar exhibited potent effects against LPS-induced damage in HUVECs through the modulation of oxidative stress, inflammation, apoptosis and MAPK pathways, which should be developed as a potent candidate for the treatment of atherosclerosis in the future.
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85
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Haslund-Vinding J, McBean G, Jaquet V, Vilhardt F. NADPH oxidases in oxidant production by microglia: activating receptors, pharmacology and association with disease. Br J Pharmacol 2016; 174:1733-1749. [PMID: 26750203 DOI: 10.1111/bph.13425] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2015] [Revised: 12/15/2015] [Accepted: 01/07/2016] [Indexed: 12/26/2022] Open
Abstract
Microglia are the resident immune cells of the CNS and constitute a self-sustaining population of CNS-adapted tissue macrophages. As mononuclear phagocytic cells, they express high levels of superoxide-producing NADPH oxidases (NOX). The sole function of the members of the NOX family is to generate reactive oxygen species (ROS) that are believed to be important in CNS host defence and in the redox signalling circuits that shape the different activation phenotypes of microglia. NOX are also important in pathological conditions, where over-generation of ROS contributes to neuronal loss via direct oxidative tissue damage or disruption of redox signalling circuits. In this review, we assess the evidence for involvement of NOX in CNS physiopathology, with particular emphasis on the most important surface receptors that lead to generation of NOX-derived ROS. We evaluate the potential significance of the subcellular distribution of NOX isoforms for redox signalling or release of ROS to the extracellular medium. Inhibitory mechanisms that have been reported to restrain NOX activity in microglia and macrophages in vivo are also discussed. We provide a critical appraisal of frequently used and recently developed NOX inhibitors. Finally, we review the recent literature on NOX and other sources of ROS that are involved in activation of the inflammasome and discuss the potential influence of microglia-derived oxidants on neurogenesis, neural differentiation and culling of surplus progenitor cells. The degree to which excessive, badly timed or misplaced NOX activation in microglia may affect neuronal homeostasis in physiological or pathological conditions certainly merits further investigation. LINKED ARTICLES This article is part of a themed section on Redox Biology and Oxidative Stress in Health and Disease. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v174.12/issuetoc.
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Affiliation(s)
- J Haslund-Vinding
- Institute of Cellular and Molecular Medicine, Copenhagen University, Copenhagen, Denmark.,Department of Pathology and Immunology, Centre Médical Universitaire, Geneva, Switzerland
| | - G McBean
- UCD School of Biomolecular and Biomedical Science, University College Dublin, Ireland
| | - V Jaquet
- Department of Pathology and Immunology, Centre Médical Universitaire, Geneva, Switzerland
| | - F Vilhardt
- Institute of Cellular and Molecular Medicine, Copenhagen University, Copenhagen, Denmark
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86
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Luo XL, Liu SY, Wang LJ, Zhang QY, Xu P, Pan LL, Hu JF. A tetramethoxychalcone from Chloranthus henryi suppresses lipopolysaccharide-induced inflammatory responses in BV2 microglia. Eur J Pharmacol 2016; 774:135-43. [PMID: 26852953 DOI: 10.1016/j.ejphar.2016.02.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 02/01/2016] [Accepted: 02/03/2016] [Indexed: 01/01/2023]
Abstract
Neuroinflammation underlies the pathogenesis and progression of neurodegenerative diseases. 2׳-hydroxy-4,3׳,4׳,6׳-tetramethoxychalcone (HTMC) is a known chalcone derivative isolated from Chloranthus henryi with anti-inflammatory activities in BV2 macrophages. However, its pharmacological effects on microglial cells have not been demonstrated. To this end, we examined the effects of HTMC on lipopolysaccharide (LPS)-induced inflammatory responses in BV2 microglial cells. HTMC concentration-dependently inhibited LPS-induced expression of inflammatory enzymes including inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2), nitric oxide (NO) production, and the secretion of inflammatory cytokines, including tumor necrosis factor (TNF)-α, interleukin (IL)-1β, and IL-6. In addition, HTMC inhibited reactive oxygen species (ROS) production by reducing NADPH oxidase (Nox) 2 and Nox4 expression. In addition, HTMC interfered LPS-induced c-Jun N-terminal kinase 1/2 (JNK) phosphorylation in a time- and concentration-dependent manner. By inhibiting phosphorylation and nuclear translocation of Jun, HTMC suppressed LPS-induced activator protein-1 (AP-1) activation. Taken together, our data indicate that HTMC suppresses inflammatory responses in LPS-stimulated BV2 microglial cells by modulating JNK-AP-1 and NADPH oxidases-ROS pathways. HTMC represents a promising therapeutic agent for neurodegenerative and related aging-associated diseases.
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Affiliation(s)
- Xiao-Ling Luo
- Shanghai Key Laboratory of Bioactive Small Molecules and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai 201203, China
| | - Si-Yu Liu
- Shanghai Key Laboratory of Bioactive Small Molecules and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai 201203, China
| | - Li-Jun Wang
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, Shanghai 201203, China
| | - Qiu-Yan Zhang
- Shanghai Key Laboratory of Bioactive Small Molecules and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai 201203, China
| | - Peng Xu
- Shanghai Key Laboratory of Bioactive Small Molecules and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai 201203, China
| | - Li-Long Pan
- Shanghai Key Laboratory of Bioactive Small Molecules and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai 201203, China.
| | - Jin-Feng Hu
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, Shanghai 201203, China.
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87
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Pathophysiology of the cochlear intrastrial fluid-blood barrier (review). Hear Res 2016; 338:52-63. [PMID: 26802581 DOI: 10.1016/j.heares.2016.01.010] [Citation(s) in RCA: 138] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 01/11/2016] [Accepted: 01/14/2016] [Indexed: 12/20/2022]
Abstract
The blood-labyrinth barrier (BLB) in the stria vascularis is a highly specialized capillary network that controls exchanges between blood and the intrastitial space in the cochlea. The barrier shields the inner ear from blood-born toxic substances and selectively passes ions, fluids, and nutrients to the cochlea, playing an essential role in the maintenance of cochlear homeostasis. Anatomically, the BLB is comprised of endothelial cells (ECs) in the strial microvasculature, elaborated tight and adherens junctions, pericytes (PCs), basement membrane (BM), and perivascular resident macrophage-like melanocytes (PVM/Ms), which together form a complex "cochlear-vascular unit" in the stria vascularis. Physical interactions between the ECs, PCs, and PVM/Ms, as well as signaling between the cells, is critical for controlling vascular permeability and providing a proper environment for hearing function. Breakdown of normal interactions between components of the BLB is seen in a wide range of pathological conditions, including genetic defects and conditions engendered by inflammation, loud sound trauma, and ageing. In this review, we will discuss prevailing views of the structure and function of the strial cochlear-vascular unit (also referred to as the "intrastrial fluid-blood barrier"). We will also discuss the disrupted homeostasis seen in a variety of hearing disorders. Therapeutic targeting of the strial barrier may offer opportunities for improvement of hearing health and amelioration of auditory disorders. This article is part of a Special Issue entitled <Annual Reviews 2016>.
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88
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Nrf2–ARE pathway: An emerging target against oxidative stress and neuroinflammation in neurodegenerative diseases. Pharmacol Ther 2016; 157:84-104. [DOI: 10.1016/j.pharmthera.2015.11.003] [Citation(s) in RCA: 324] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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89
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Weaver CJ, Leung YF, Suter DM. Expression dynamics of NADPH oxidases during early zebrafish development. J Comp Neurol 2015; 524:2130-41. [PMID: 26662995 DOI: 10.1002/cne.23938] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 11/03/2015] [Accepted: 11/24/2015] [Indexed: 12/20/2022]
Affiliation(s)
- Cory J. Weaver
- Department of Biological Sciences; Purdue University; West Lafayette Indiana 47907
| | - Yuk Fai Leung
- Department of Biological Sciences; Purdue University; West Lafayette Indiana 47907
| | - Daniel M. Suter
- Department of Biological Sciences; Purdue University; West Lafayette Indiana 47907
- Bindley Bioscience Center; Purdue University; West Lafayette Indiana 47907
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90
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TLR4-activated microglia require IFN-γ to induce severe neuronal dysfunction and death in situ. Proc Natl Acad Sci U S A 2015; 113:212-7. [PMID: 26699475 DOI: 10.1073/pnas.1513853113] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Microglia (tissue-resident macrophages) represent the main cell type of the innate immune system in the CNS; however, the mechanisms that control the activation of microglia are widely unknown. We systematically explored microglial activation and functional microglia-neuron interactions in organotypic hippocampal slice cultures, i.e., postnatal cortical tissue that lacks adaptive immunity. We applied electrophysiological recordings of local field potential and extracellular K(+) concentration, immunohistochemistry, design-based stereology, morphometry, Sholl analysis, and biochemical analyses. We show that chronic activation with either bacterial lipopolysaccharide through Toll-like receptor 4 (TLR4) or leukocyte cytokine IFN-γ induces reactive phenotypes in microglia associated with morphological changes, population expansion, CD11b and CD68 up-regulation, and proinflammatory cytokine (IL-1β, TNF-α, IL-6) and nitric oxide (NO) release. Notably, these reactive phenotypes only moderately alter intrinsic neuronal excitability and gamma oscillations (30-100 Hz), which emerge from precise synaptic communication of glutamatergic pyramidal cells and fast-spiking, parvalbumin-positive GABAergic interneurons, in local hippocampal networks. Short-term synaptic plasticity and extracellular potassium homeostasis during neural excitation, also reflecting astrocyte function, are unaffected. In contrast, the coactivation of TLR4 and IFN-γ receptors results in neuronal dysfunction and death, caused mainly by enhanced microglial inducible nitric oxide synthase (iNOS) expression and NO release, because iNOS inhibition is neuroprotective. Thus, activation of TLR4 in microglia in situ requires concomitant IFN-γ receptor signaling from peripheral immune cells, such as T helper type 1 and natural killer cells, to unleash neurotoxicity and inflammation-induced neurodegeneration. Our findings provide crucial mechanistic insight into the complex process of microglia activation, with relevance to several neurologic and psychiatric disorders.
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91
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Mossakowski AA, Pohlan J, Bremer D, Lindquist R, Millward JM, Bock M, Pollok K, Mothes R, Viohl L, Radbruch M, Gerhard J, Bellmann-Strobl J, Behrens J, Infante-Duarte C, Mähler A, Boschmann M, Rinnenthal JL, Füchtemeier M, Herz J, Pache FC, Bardua M, Priller J, Hauser AE, Paul F, Niesner R, Radbruch H. Tracking CNS and systemic sources of oxidative stress during the course of chronic neuroinflammation. Acta Neuropathol 2015; 130:799-814. [PMID: 26521072 PMCID: PMC4654749 DOI: 10.1007/s00401-015-1497-x] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 10/15/2015] [Accepted: 10/15/2015] [Indexed: 11/30/2022]
Abstract
The functional dynamics and cellular sources of oxidative stress are central to understanding MS pathogenesis but remain elusive, due to the lack of appropriate detection methods. Here we employ NAD(P)H fluorescence lifetime imaging to detect functional NADPH oxidases (NOX enzymes) in vivo to identify inflammatory monocytes, activated microglia, and astrocytes expressing NOX1 as major cellular sources of oxidative stress in the central nervous system of mice affected by experimental autoimmune encephalomyelitis (EAE). This directly affects neuronal function in vivo, indicated by sustained elevated neuronal calcium. The systemic involvement of oxidative stress is mirrored by overactivation of NOX enzymes in peripheral CD11b+ cells in later phases of both MS and EAE. This effect is antagonized by systemic intake of the NOX inhibitor and anti-oxidant epigallocatechin-3-gallate. Together, this persistent hyper-activation of oxidative enzymes suggests an “oxidative stress memory” both in the periphery and CNS compartments, in chronic neuroinflammation.
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Affiliation(s)
- Agata A Mossakowski
- German Rheumatism Research Center, Berlin, Germany
- Department of Neurology, NeuroCure Clinical Research Center, Clinical and Experimental Multiple Sclerosis Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Institut für Neuropathologie, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Julian Pohlan
- German Rheumatism Research Center, Berlin, Germany
- Institut für Neuropathologie, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Intravital Imaging and Immune Dynamics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | | | | | - Jason M Millward
- Institute for Medical Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Markus Bock
- Experimental and Clinical Research Center, Max Delbrueck Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Karolin Pollok
- Institut für Neuropathologie, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Intravital Imaging and Immune Dynamics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Ronja Mothes
- Institut für Neuropathologie, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Intravital Imaging and Immune Dynamics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Leonard Viohl
- Institut für Neuropathologie, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Intravital Imaging and Immune Dynamics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Moritz Radbruch
- German Rheumatism Research Center, Berlin, Germany
- Institut für Neuropathologie, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | | | - Judith Bellmann-Strobl
- Department of Neurology, NeuroCure Clinical Research Center, Clinical and Experimental Multiple Sclerosis Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Experimental and Clinical Research Center, Max Delbrueck Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Janina Behrens
- Department of Neurology, NeuroCure Clinical Research Center, Clinical and Experimental Multiple Sclerosis Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Carmen Infante-Duarte
- Institute for Medical Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Anja Mähler
- Experimental and Clinical Research Center, Max Delbrueck Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Michael Boschmann
- Experimental and Clinical Research Center, Max Delbrueck Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Jan Leo Rinnenthal
- Institut für Neuropathologie, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | | | - Josephine Herz
- Department of Paediatrics I, Neonatology, University Hospital Essen, Essen, 45122, Germany
| | - Florence C Pache
- German Rheumatism Research Center, Berlin, Germany
- Department of Neurology, NeuroCure Clinical Research Center, Clinical and Experimental Multiple Sclerosis Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Intravital Imaging and Immune Dynamics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | | | - Josef Priller
- Department of Neuropsychiatry and Laboratory of Molecular Psychiatry, Charité-Universitätsmedizin Berlin, Cluster of Excellence NeuroCure and BIH, Berlin, Germany
| | - Anja E Hauser
- German Rheumatism Research Center, Berlin, Germany
- Intravital Imaging and Immune Dynamics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Friedemann Paul
- Department of Neurology, NeuroCure Clinical Research Center, Clinical and Experimental Multiple Sclerosis Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Experimental and Clinical Research Center, Max Delbrueck Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, Berlin, Germany
| | | | - Helena Radbruch
- Institut für Neuropathologie, Charité-Universitätsmedizin Berlin, Berlin, Germany.
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92
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Khayrullina G, Bermudez S, Byrnes KR. Inhibition of NOX2 reduces locomotor impairment, inflammation, and oxidative stress after spinal cord injury. J Neuroinflammation 2015; 12:172. [PMID: 26377802 PMCID: PMC4574142 DOI: 10.1186/s12974-015-0391-8] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 09/03/2015] [Indexed: 12/12/2022] Open
Abstract
Background Spinal cord injury (SCI) results in the activation of the NADPH oxidase (NOX) enzyme, inducing production of reactive oxygen species (ROS). We hypothesized that the NOX2 isoform plays an integral role in post-SCI inflammation and functional deficits. Methods Moderate spinal cord contusion injury was performed in adult male mice, and flow cytometry, western blot, and immunohistochemistry were used to assess NOX2 activity and expression, inflammation, and M1/M2 microglia/macrophage polarization from 1 to 28 days after injury. The NOX2-specific inhibitor, gp91ds-tat, was injected into the intrathecal space immediately after impact. The Basso Mouse Scale (BMS) was used to assess locomotor function at 24 h post-injury and weekly thereafter. Results Our findings show that gp91ds-tat treatment significantly improved functional recovery through 28 days post-injury and reduced inflammatory cell concentrations in the injured spinal cord at 24 h and 7 days post-injury. In addition, a number of oxidative stress markers were reduced in expression at 24 h after gp91ds-tat treatment, which was accompanied by a reduction in M1 polarization marker expression. Conclusion Based on our findings, we now conclude that inhibition of NOX2 significantly improves outcome after SCI, most likely via acute reductions in oxidative stress and inflammation. NOX2 inhibition may therefore have true potential as a therapy after SCI.
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Affiliation(s)
- Guzal Khayrullina
- Anatomy, Physiology and Genetics Department, Uniformed Services University, Room B2048, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| | - Sara Bermudez
- Anatomy, Physiology and Genetics Department, Uniformed Services University, Room B2048, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| | - Kimberly R Byrnes
- Anatomy, Physiology and Genetics Department, Uniformed Services University, Room B2048, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
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93
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Brown GC, Vilalta A. How microglia kill neurons. Brain Res 2015; 1628:288-297. [PMID: 26341532 DOI: 10.1016/j.brainres.2015.08.031] [Citation(s) in RCA: 205] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Revised: 08/03/2015] [Accepted: 08/24/2015] [Indexed: 12/11/2022]
Abstract
Microglia are resident brain macrophages that become inflammatory activated in most brain pathologies. Microglia normally protect neurons, but may accidentally kill neurons when attempting to limit infections or damage, and this may be more common with degenerative disease as there was no significant selection pressure on the aged brain in the past. A number of mechanisms by which activated microglia kill neurons have been identified, including: (i) stimulation of the phagocyte NADPH oxidase (PHOX) to produce superoxide and derivative oxidants, (ii) expression of inducible nitric oxide synthase (iNOS) producing NO and derivative oxidants, (iii) release of glutamate and glutaminase, (iv) release of TNFα, (v) release of cathepsin B, (vi) phagocytosis of stressed neurons, and (vii) decreased release of nutritive BDNF and IGF-1. PHOX stimulation contributes to microglial activation, but is not directly neurotoxic unless NO is present. NO is normally neuroprotective, but can react with superoxide to produce neurotoxic peroxynitrite, or in the presence of hypoxia inhibit mitochondrial respiration. Glutamate can be released by glia or neurons, but is neurotoxic only if the neurons are depolarised, for example as a result of mitochondrial inhibition. TNFα is normally neuroprotective, but can become toxic if caspase-8 or NF-κB activation are inhibited. If the above mechanisms do not kill neurons, they may still stress the neurons sufficiently to make them susceptible to phagocytosis by activated microglia. We review here whether microglial killing of neurons is an artefact, makes evolutionary sense or contributes in common neuropathologies and by what mechanisms. This article is part of a Special Issue entitled SI: Neuroprotection.
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Affiliation(s)
- Guy C Brown
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1QW, UK.
| | - Anna Vilalta
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1QW, UK
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94
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Carbone F, Teixeira PC, Braunersreuther V, Mach F, Vuilleumier N, Montecucco F. Pathophysiology and Treatments of Oxidative Injury in Ischemic Stroke: Focus on the Phagocytic NADPH Oxidase 2. Antioxid Redox Signal 2015; 23:460-89. [PMID: 24635113 PMCID: PMC4545676 DOI: 10.1089/ars.2013.5778] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
SIGNIFICANCE Phagocytes play a key role in promoting the oxidative stress after ischemic stroke occurrence. The phagocytic NADPH oxidase (NOX) 2 is a membrane-bound enzyme complex involved in the antimicrobial respiratory burst and free radical production in these cells. RECENT ADVANCES Different oxidants have been shown to induce opposite effects on neuronal homeostasis after a stroke. However, several experimental models support the detrimental effects of NOX activity (especially the phagocytic isoform) on brain recovery after stroke. Therapeutic strategies selectively targeting the neurotoxic ROS and increasing neuroprotective oxidants have recently produced promising results. CRITICAL ISSUES NOX2 might promote carotid plaque rupture and stroke occurrence. In addition, NOX2-derived reactive oxygen species (ROS) released by resident and recruited phagocytes enhance cerebral ischemic injury, activating the inflammatory apoptotic pathways. The aim of this review is to update evidence on phagocyte-related oxidative stress, focusing on the role of NOX2 as a potential therapeutic target to reduce ROS-related cerebral injury after stroke. FUTURE DIRECTIONS Radical scavenger compounds (such as Ebselen and Edaravone) are under clinical investigation as a therapeutic approach against stroke. On the other hand, NOX inhibition might represent a promising strategy to prevent the stroke-related injury. Although selective NOX inhibitors are not yet available, nonselective compounds (such as apocynin and fasudil) provided encouraging results in preclinical studies. Whereas additional studies are needed to better evaluate this therapeutic potential in human beings, the development of specific NOX inhibitors (such as monoclonal antibodies, small-molecule inhibitors, or aptamers) might further improve brain recovery after stroke.
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Affiliation(s)
- Federico Carbone
- 1 Division of Cardiology, Foundation for Medical Researches, Department of Medical Specialties, University of Geneva , Geneva, Switzerland .,2 Department of Internal Medicine, University of Genoa School of Medicine , IRCCS Azienda Ospedaliera Universitaria San Martino-IST Istituto Nazionale per la Ricerca sul Cancro, Genoa, Italy
| | - Priscila Camillo Teixeira
- 3 Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine, Geneva University Hospitals , Geneva, Switzerland
| | - Vincent Braunersreuther
- 1 Division of Cardiology, Foundation for Medical Researches, Department of Medical Specialties, University of Geneva , Geneva, Switzerland
| | - François Mach
- 1 Division of Cardiology, Foundation for Medical Researches, Department of Medical Specialties, University of Geneva , Geneva, Switzerland
| | - Nicolas Vuilleumier
- 3 Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine, Geneva University Hospitals , Geneva, Switzerland
| | - Fabrizio Montecucco
- 1 Division of Cardiology, Foundation for Medical Researches, Department of Medical Specialties, University of Geneva , Geneva, Switzerland .,2 Department of Internal Medicine, University of Genoa School of Medicine , IRCCS Azienda Ospedaliera Universitaria San Martino-IST Istituto Nazionale per la Ricerca sul Cancro, Genoa, Italy .,3 Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine, Geneva University Hospitals , Geneva, Switzerland
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95
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Altenhöfer S, Radermacher KA, Kleikers PWM, Wingler K, Schmidt HHHW. Evolution of NADPH Oxidase Inhibitors: Selectivity and Mechanisms for Target Engagement. Antioxid Redox Signal 2015; 23:406-27. [PMID: 24383718 PMCID: PMC4543484 DOI: 10.1089/ars.2013.5814] [Citation(s) in RCA: 386] [Impact Index Per Article: 42.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
SIGNIFICANCE Oxidative stress, an excess of reactive oxygen species (ROS) production versus consumption, may be involved in the pathogenesis of different diseases. The only known enzymes solely dedicated to ROS generation are nicotinamide adenine dinucleotide phosphate (NADPH) oxidases with their catalytic subunits (NOX). After the clinical failure of most antioxidant trials, NOX inhibitors are the most promising therapeutic option for diseases associated with oxidative stress. RECENT ADVANCES Historical NADPH oxidase inhibitors, apocynin and diphenylene iodonium, are un-specific and not isoform selective. Novel NOX inhibitors stemming from rational drug discovery approaches, for example, GKT137831, ML171, and VAS2870, show improved specificity for NADPH oxidases and moderate NOX isoform selectivity. Along with NOX2 docking sequence (NOX2ds)-tat, a peptide-based inhibitor, the use of these novel small molecules in animal models has provided preliminary in vivo evidence for a pathophysiological role of specific NOX isoforms. CRITICAL ISSUES Here, we discuss whether novel NOX inhibitors enable reliable validation of NOX isoforms' pathological roles and whether this knowledge supports translation into pharmacological applications. Modern NOX inhibitors have increased the evidence for pathophysiological roles of NADPH oxidases. However, in comparison to knockout mouse models, NOX inhibitors have limited isoform selectivity. Thus, their use does not enable clear statements on the involvement of individual NOX isoforms in a given disease. FUTURE DIRECTIONS The development of isoform-selective NOX inhibitors and biologicals will enable reliable validation of specific NOX isoforms in disease models other than the mouse. Finally, GKT137831, the first NOX inhibitor in clinical development, is poised to provide proof of principle for the clinical potential of NOX inhibition.
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Affiliation(s)
- Sebastian Altenhöfer
- Department of Pharmacology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University , Maastricht, the Netherlands
| | - Kim A Radermacher
- Department of Pharmacology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University , Maastricht, the Netherlands
| | - Pamela W M Kleikers
- Department of Pharmacology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University , Maastricht, the Netherlands
| | - Kirstin Wingler
- Department of Pharmacology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University , Maastricht, the Netherlands
| | - Harald H H W Schmidt
- Department of Pharmacology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University , Maastricht, the Netherlands
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Ishihara Y, Takemoto T, Itoh K, Ishida A, Yamazaki T. Dual role of superoxide dismutase 2 induced in activated microglia: oxidative stress tolerance and convergence of inflammatory responses. J Biol Chem 2015; 290:22805-17. [PMID: 26231211 DOI: 10.1074/jbc.m115.659151] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Indexed: 12/13/2022] Open
Abstract
Microglia are activated quickly in response to external pathogens or cell debris and clear these substances via the inflammatory response. However, excessive activation of microglia can be harmful to host cells due to the increased production of reactive oxygen species and proinflammatory cytokines. Superoxide dismutase 2 (SOD2) is reportedly induced under various inflammatory conditions in the central nervous system. We herein demonstrated that activated microglia strongly express SOD2 and examined the role of SOD2, focusing on regulation of the microglial activity and the susceptibility of microglia to oxidative stress. When rat primary microglia were treated with LPS, poly(I:C), peptidoglycan, or CpG oligodeoxynucleotide, respectively, the mRNA and protein levels of SOD2 largely increased. However, an increased expression of SOD2 was not detected in the primary neurons or astrocytes, indicating that SOD2 is specifically induced in microglia under inflammatory conditions. The activated microglia showed high tolerance to oxidative stress, whereas SOD2 knockdown conferred vulnerability to oxidative stress. Interestingly, the production of proinflammatory cytokines was increased in the activated microglia treated with SOD2 siRNA compared with that observed in the control siRNA-treated cells. Pretreatment with NADPH oxidase inhibitors, diphenylene iodonium and apocynin, decreased in not only reactive oxygen species generation but also the proinflammatory cytokine expression. Notably, SOD2 knockdown largely potentiated the nuclear factor κB activity in the activated microglia. Taken together, increased SOD2 conferred tolerance to oxidative stress in the microglia and decreased proinflammatory cytokine production by attenuating the nuclear factor κB activity. Therefore, SOD2 might regulate neuroinflammation by controlling the microglial activities.
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Affiliation(s)
- Yasuhiro Ishihara
- From the Laboratory of Molecular Brain Science, Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan and
| | - Takuya Takemoto
- From the Laboratory of Molecular Brain Science, Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan and
| | - Kouichi Itoh
- the Laboratory for Brain Science, Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Kagawa, 769-2193, Japan
| | - Atsuhiko Ishida
- From the Laboratory of Molecular Brain Science, Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan and
| | - Takeshi Yamazaki
- From the Laboratory of Molecular Brain Science, Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan and
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97
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Parajuli B, Horiuchi H, Mizuno T, Takeuchi H, Suzumura A. CCL11 enhances excitotoxic neuronal death by producing reactive oxygen species in microglia. Glia 2015; 63:2274-84. [PMID: 26184677 DOI: 10.1002/glia.22892] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Revised: 06/05/2015] [Accepted: 06/30/2015] [Indexed: 12/28/2022]
Abstract
The chemokine CCL11 (also known as eotaxin-1) is a potent eosinophil chemoattractant that mediates allergic diseases such as asthma, atopic dermatitis, and inflammatory bowel diseases. Previous studies demonstrated that concentrations of CCL11 are elevated in the sera and cerebrospinal fluids (CSF) of patients with neuroinflammatory disorders, including multiple sclerosis. Moreover, the levels of CCL11 in plasma and CSF increase with age, and CCL11 suppresses adult neurogenesis in the central nervous system (CNS), resulting in memory impairment. However, the precise source and function of CCL11 in the CNS are not fully understood. In this study, we found that activated astrocytes release CCL11, whereas microglia predominantly express the CCL11 receptor. CCL11 significantly promoted the migration of microglia, and induced microglial production of reactive oxygen species by upregulating nicotinamide adenine dinucleotide phosphate-oxidase 1 (NOX1), thereby promoting excitotoxic neuronal death. These effects were reversed by inhibition of NOX1. Our findings suggest that CCL11 released from activated astrocytes triggers oxidative stress via microglial NOX1 activation and potentiates glutamate-mediated neurotoxicity, which may be involved in the pathogenesis of various neurological disorders.
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Affiliation(s)
- Bijay Parajuli
- Department of Neuroimmunology, Research Institute of Environmental Medicine, Nagoya University, Chikusa-Ku, Nagoya, Japan
| | - Hiroshi Horiuchi
- Department of Neuroimmunology, Research Institute of Environmental Medicine, Nagoya University, Chikusa-Ku, Nagoya, Japan
| | - Tetsuya Mizuno
- Department of Neuroimmunology, Research Institute of Environmental Medicine, Nagoya University, Chikusa-Ku, Nagoya, Japan
| | - Hideyuki Takeuchi
- Department of Neuroimmunology, Research Institute of Environmental Medicine, Nagoya University, Chikusa-Ku, Nagoya, Japan
| | - Akio Suzumura
- Department of Neuroimmunology, Research Institute of Environmental Medicine, Nagoya University, Chikusa-Ku, Nagoya, Japan
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98
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Cui Y, Park JY, Wu J, Lee JH, Yang YS, Kang MS, Jung SC, Park JM, Yoo ES, Kim SH, Ahn Jo S, Suk K, Eun SY. Dieckol Attenuates Microglia-mediated Neuronal Cell Death via ERK, Akt and NADPH Oxidase-mediated Pathways. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2015; 19:219-28. [PMID: 25954126 PMCID: PMC4422961 DOI: 10.4196/kjpp.2015.19.3.219] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Revised: 02/02/2015] [Accepted: 02/23/2015] [Indexed: 01/01/2023]
Abstract
Excessive microglial activation and subsequent neuroinflammation lead to synaptic loss and dysfunction as well as neuronal cell death, which are involved in the pathogenesis and progression of several neurodegenerative diseases. Thus, the regulation of microglial activation has been evaluated as effective therapeutic strategies. Although dieckol (DEK), one of the phlorotannins isolated from marine brown alga Ecklonia cava, has been previously reported to inhibit microglial activation, the molecular mechanism is still unclear. Therefore, we investigated here molecular mechanism of DEK via extracellular signal-regulated kinase (ERK), Akt and nicotinamide adenine dinuclelotide phosphate (NADPH) oxidase-mediated pathways. In addition, the neuroprotective mechanism of DEK was investigated in microglia-mediated neurotoxicity models such as neuron-microglia co-culture and microglial conditioned media system. Our results demonstrated that treatment of anti-oxidant DEK potently suppressed phosphorylation of ERK in lipopolysaccharide (LPS, 1 µg/ml)-stimulated BV-2 microglia. In addition, DEK markedly attenuated Akt phosphorylation and increased expression of gp91phox, which is the catalytic component of NADPH oxidase complex responsible for microglial reactive oxygen species (ROS) generation. Finally, DEK significantly attenuated neuronal cell death that is induced by treatment of microglial conditioned media containing neurotoxic secretary molecules. These neuroprotective effects of DEK were also confirmed in a neuron-microglia co-culture system using enhanced green fluorescent protein (EGFP)-transfected B35 neuroblastoma cell line. Taken together, these results suggest that DEK suppresses excessive microglial activation and microglia-mediated neuronal cell death via downregulation of ERK, Akt and NADPH oxidase-mediated pathways.
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Affiliation(s)
- Yanji Cui
- Department of Physiology, Jeju National University School of Medicine, Jeju 690-756, Korea
| | - Jee-Yun Park
- Department of Physiology, Jeju National University School of Medicine, Jeju 690-756, Korea
| | - Jinji Wu
- Department of Physiology, Jeju National University School of Medicine, Jeju 690-756, Korea
| | - Ji Hyung Lee
- Department of Physiology, Jeju National University School of Medicine, Jeju 690-756, Korea
| | - Yoon-Sil Yang
- Department of Physiology, Jeju National University School of Medicine, Jeju 690-756, Korea
| | - Moon-Seok Kang
- Department of Physiology, Jeju National University School of Medicine, Jeju 690-756, Korea
| | - Sung-Cherl Jung
- Department of Physiology, Jeju National University School of Medicine, Jeju 690-756, Korea
| | - Joo Min Park
- Department of Physiology, Jeju National University School of Medicine, Jeju 690-756, Korea
| | - Eun-Sook Yoo
- Department of Pharmacology, Jeju National University School of Medicine, Jeju 690-756, Korea
| | - Seong-Ho Kim
- BotaMedi Inc. 307 Jeju Bio-industry Center, Jeju 690-121, Korea
| | - Sangmee Ahn Jo
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine and Department of Pharmacology, Dankook University, Cheonan 330-951, Korea
| | - Kyoungho Suk
- Department of Pharmacology, Kyungpook National University School of Medicine, Daegu 700-842, Korea
| | - Su-Yong Eun
- Department of Physiology, Jeju National University School of Medicine, Jeju 690-756, Korea
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99
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Olguín-Albuerne M, Morán J. ROS produced by NOX2 control in vitro development of cerebellar granule neurons development. ASN Neuro 2015; 7:7/2/1759091415578712. [PMID: 25873309 PMCID: PMC4720178 DOI: 10.1177/1759091415578712] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Reactive oxygen species (ROS) act as signaling molecules that regulate nervous system physiology. ROS have been related to neural differentiation, neuritogenesis, and programmed cell death. Nevertheless, little is known about the mechanisms involved in the regulation of ROS during neuronal development. In this study, we evaluated the mechanisms by which ROS are regulated during neuronal development and the implications of these molecules in this process. Primary cultures of cerebellar granule neurons (CGN) were used to address these issues. Our results show that during the first 3 days of CGN development in vitro (days in vitro; DIV), the levels of ROS increased, reaching a peak at 2 and 3 DIV under depolarizing (25 mM KCl) and nondepolarizing (5 mM KCl) conditions. Subsequently, under depolarizing conditions, the ROS levels markedly decreased, but in nondepolarizing conditions, the ROS levels increased gradually. This correlated with the extent of CGN maturation. Also, antioxidants and NADPH-oxidases (NOX) inhibitors reduced the expression of Tau and MAP2. On the other hand, the levels of glutathione markedly increased at 1 DIV. We inferred that the ROS increase at this time is critical for cell survival because glutathione depletion leads to axonal degeneration and CGN death only at 2 DIV. During the first 3 DIV, NOX2 was upregulated and expressed in filopodia and growth cones, which correlated with the hydrogen peroxide (H2O2) distribution in the cell. Finally, NOX2 KO CGN showed shorter neurites than wild-type CGN. Taken together, these results suggest that the regulation of ROS is critical during the early stages of CGN development.
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Affiliation(s)
- Mauricio Olguín-Albuerne
- División de Neurociencias, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, México City, México
| | - Julio Morán
- División de Neurociencias, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, México City, México
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100
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Fan H, Wu PF, Zhang L, Hu ZL, Wang W, Guan XL, Luo H, Ni M, Yang JW, Li MX, Chen JG, Wang F. Methionine sulfoxide reductase A negatively controls microglia-mediated neuroinflammation via inhibiting ROS/MAPKs/NF-κB signaling pathways through a catalytic antioxidant function. Antioxid Redox Signal 2015; 22:832-47. [PMID: 25602783 PMCID: PMC4367238 DOI: 10.1089/ars.2014.6022] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
AIMS Oxidative burst is one of the earliest biochemical events in the inflammatory activation of microglia. Here, we investigated the potential role of methionine sulfoxide reductase A (MsrA), a key antioxidant enzyme, in the control of microglia-mediated neuroinflammation. RESULTS MsrA was detected in rat microglia and its expression was upregulated on microglial activation. Silencing of MsrA exacerbated lipopolysaccharide (LPS)-induced activation of microglia and the production of inflammatory markers, indicating that MsrA may function as an endogenous protective mechanism for limiting uncontrolled neuroinflammation. Application of exogenous MsrA by transducing Tat-rMsrA fusion protein into microglia attenuated LPS-induced neuroinflammatory events, which was indicated by an increased Iba1 (a specific microglial marker) expression and the secretion of pro-inflammatory cytokines, and this attenuation was accompanied by inhibiting multiple signaling pathways such as p38 and ERK mitogen-activated protein kinases (MAPKs) and nuclear factor kappaB (NF-κB). These effects were due to MsrA-mediated reactive oxygen species (ROS) elimination, which may be derived from a catalytic effect of MsrA on the reaction of methionine with ROS. Furthermore, the transduction of Tat-rMsrA fusion protein suppressed the activation of microglia and the expression of pro-inflammatory factors in a rat model of neuroinflammation in vivo. INNOVATION This study provides the first direct evidence for the biological significance of MsrA in microglia-mediated neuroinflammation. CONCLUSION Our data provide a profound insight into the role of endogenous antioxidative defense systems such as MsrA in the control of microglial function.
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Affiliation(s)
- Hua Fan
- 1 Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology , Wuhan City, China
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