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Wang C, Zong S, Cui X, Wang X, Wu S, Wang L, Liu Y, Lu Z. The effects of microglia-associated neuroinflammation on Alzheimer's disease. Front Immunol 2023; 14:1117172. [PMID: 36911732 PMCID: PMC9992739 DOI: 10.3389/fimmu.2023.1117172] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 02/10/2023] [Indexed: 02/24/2023] Open
Abstract
Alzheimer's disease (AD) is defined as a severe chronic degenerative neurological disease in human. The pathogenic mechanism of AD has been convincingly elucidated by the "amyloid cascade hypothesis" with the main focus of the pathological accretion of β-amyloid (Aβ) peptides outside the cell. However, increasing evidence suggests that this hypothesis is weak in explaining the pathogenesis of AD. Neuroinflammation is crucial in the development of AD, which is proven by the elevated levels of inflammatory markers and the identification of AD risk genes relevant to the innate immune function. Here, we summarize the effects of microglia-mediated neuroinflammation on AD, focusing on the temporal and spatial changes in microglial phenotype, the interactions among microglia, Aβ, tau, and neurons, and the prospects and recent advances in neuroinflammation as a diagnostic and therapeutic target of AD.
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Affiliation(s)
- Cuicui Wang
- Department of Clinical Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Shuai Zong
- Department of Clinical Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Xiaolin Cui
- School of Medicine, Shandong University, Jinan, Shandong, China
| | - Xueying Wang
- Department of Clinical Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Shuang Wu
- School of Medicine, Shandong University, Jinan, Shandong, China
| | - Le Wang
- Department of Clinical Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Yingchao Liu
- Department of Clinical Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Zhiming Lu
- Department of Clinical Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
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Sharma N, Banerjee R, Davis RL. Early Mitochondrial Defects in the 5xFAD Mouse Model of Alzheimer's Disease. J Alzheimers Dis 2023; 91:1323-1338. [PMID: 36617782 DOI: 10.3233/jad-220884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND Mitochondrial (MT) dysfunction is a hallmark of Alzheimer's disease (AD). Amyloid-β protein precursor and amyloid-β peptides localize to MT and lead to MT dysfunction in familial forms of AD. This dysfunction may trigger subsequent types of pathology. OBJECTIVE To identify the MT phenotypes that occur early in order to help understand the cascade of AD pathophysiology. METHODS The 5xFAD mouse model was used to explore the time course of MT pathologies in both sexes. Protein biomarkers for MT dynamics were measured biochemically and MT function was measured using oxygen consumption and ATP assays. RESULTS We discovered progressive alterations in mitochondrial dynamics (biogenesis, fission, fusion, and mitophagy) and function (O2 consumption, ATP generation, and Ca2+ import) in the hippocampus of 5xFAD mice in both sexes as early as 2 months of age. Thus, mitochondrial dynamics and function become altered at young ages, consistent with an early role for mitochondria in the AD pathological cascade. CONCLUSION Our study offers the baseline information required to understand the hierarchical relationship between the multiple pathologies that develop in this mouse model and provides early biomarkers for MT dysfunction. This will aid in dissecting the temporal cascade of pathologies, understanding sex-specific differences, and in testing the efficacy of putative mitochondrial therapeutics.
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Affiliation(s)
- Neelam Sharma
- Department of Neuroscience, University of Florida Scripps Biomedical Research Institute, Jupiter, FL, USA
| | - Rupkatha Banerjee
- Department of Neuroscience, University of Florida Scripps Biomedical Research Institute, Jupiter, FL, USA
| | - Ronald L Davis
- Department of Neuroscience, University of Florida Scripps Biomedical Research Institute, Jupiter, FL, USA
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Huang W, Xia Q, Zheng F, Zhao X, Ge F, Xiao J, Liu Z, Shen Y, Ye K, Wang D, Li Y. Microglia-Mediated Neurovascular Unit Dysfunction in Alzheimer's Disease. J Alzheimers Dis 2023; 94:S335-S354. [PMID: 36683511 PMCID: PMC10473143 DOI: 10.3233/jad-221064] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/17/2022] [Indexed: 01/21/2023]
Abstract
The neurovascular unit (NVU) is involved in the pathological changes in Alzheimer's disease (AD). The NVU is a structural and functional complex that maintains microenvironmental homeostasis and metabolic balance in the central nervous system. As one of the most important components of the NVU, microglia not only induce blood-brain barrier breakdown by promoting neuroinflammation, the infiltration of peripheral white blood cells and oxidative stress but also mediate neurovascular uncoupling by inducing mitochondrial dysfunction in neurons, abnormal contraction of cerebral vessels, and pericyte loss in AD. In addition, microglia-mediated dysfunction of cellular components in the NVU, such as astrocytes and pericytes, can destroy the integrity of the NVU and lead to NVU impairment. Therefore, we review the mechanisms of microglia-mediated NVU dysfunction in AD. Furthermore, existing therapeutic advancements aimed at restoring the function of microglia and the NVU in AD are discussed. Finally, we predict the role of pericytes in microglia-mediated NVU dysfunction in AD is the hotspot in the future.
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Affiliation(s)
- Wenhao Huang
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Qing Xia
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
- Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Feifei Zheng
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Xue Zhao
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Fangliang Ge
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jiaying Xiao
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Zijie Liu
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Yingying Shen
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Ke Ye
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Dayong Wang
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
- Basic Medical Institute, Heilongjiang Medical Science Academy, Harbin, Heilongjiang Province, China
- Translational Medicine Center of Northern China, Harbin, Heilongjiang Province, China
- Key Laboratory of Heilongjiang Province for Genetically Modified Animals, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Yanze Li
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang Province, China
- Basic Medical Institute, Heilongjiang Medical Science Academy, Harbin, Heilongjiang Province, China
- Translational Medicine Center of Northern China, Harbin, Heilongjiang Province, China
- Key Laboratory of Heilongjiang Province for Genetically Modified Animals, Harbin Medical University, Harbin, Heilongjiang Province, China
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Ng W, Ng SY. Remodeling of astrocyte secretome in amyotrophic lateral sclerosis: uncovering novel targets to combat astrocyte-mediated toxicity. Transl Neurodegener 2022; 11:54. [PMID: 36567359 PMCID: PMC9791755 DOI: 10.1186/s40035-022-00332-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 12/05/2022] [Indexed: 12/27/2022] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is an adult-onset paralytic disease characterized by progressive degeneration of upper and lower motor neurons in the motor cortex, brainstem and spinal cord. Motor neuron degeneration is typically caused by a combination of intrinsic neuronal (cell autonomous) defects as well as extrinsic (non-cell autonomous) factors such as astrocyte-mediated toxicity. Astrocytes are highly plastic cells that react to their microenvironment to mediate relevant responses. In neurodegeneration, astrocytes often turn reactive and in turn secrete a slew of factors to exert pro-inflammatory and neurotoxic effects. Various efforts have been carried out to characterize the diseased astrocyte secretome over the years, revealing that pro-inflammatory chemokines, cytokines and microRNAs are the main players in mediating neuronal death. As metabolomic technologies mature, these studies begin to shed light on neurotoxic metabolites such as secreted lipids. In this focused review, we will discuss changes in the astrocyte secretome during ALS. In particular, we will discuss the components of the reactive astrocyte secretome that contribute to neuronal death in ALS.
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Affiliation(s)
- Winanto Ng
- grid.418812.60000 0004 0620 9243Institute of Molecular and Cell Biology, A*STAR Research Entities, Singapore, 138673 Singapore
| | - Shi-Yan Ng
- grid.418812.60000 0004 0620 9243Institute of Molecular and Cell Biology, A*STAR Research Entities, Singapore, 138673 Singapore
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Gulmammadli N, Konukoğlu D, Merve Kurtuluş E, Tezen D, Ibrahim Erbay M, Bozluolçay M. Serum Sirtuin-1, HMGB1-TLR4, NF-KB and IL-6 levels in Alzheimer's: The Relation Between Neuroinflammatory Pathway and Severity of Dementia. Curr Alzheimer Res 2022; 19:CAR-EPUB-128443. [PMID: 36573053 DOI: 10.2174/1567205020666221226140721] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/03/2022] [Accepted: 11/18/2022] [Indexed: 12/28/2022]
Abstract
Alzheimer's disease (AD), which affects the world's aging population, is a progressive neurodegenerative disease requiring markers or tools to accurately and easily diagnose and monitor the process accurately and easily. OBJECTIVE In this study, serum Sirtuin-1(SIRT-1), High Mobility Group Box 1 (HMGB1), Toll-Like Receptor-4 (TLR4), Nuclear Factor Kappa B (NF-kB), Interleukine-6 (IL-6), Amyloid βeta-42 (Aβ-42), and p-tau181 levels in patients diagnosed with AD according to NINCS-ADRA criteria were studied. We investigated the inflammatory pathways that lead to progressive neuronal loss and highlight their possible relationship with dementia severity in the systemic circulation. METHODS Patients over 60 years of age were grouped according to their Standard Mini Mental Test results, MRI, and/or Fludeoxyglucose positron emission tomography or according to their CT findings as Control n:20; AD n:32; Vascular Dementia (VD) n:17; AD + VD; n=21. Complete blood count, Glucose, Vitamin B12, Folic Acid, Enzymes, Urea, Creatinine, Electrolytes, Bilirubin, and Thyroid Function tests were evaluated. ELISA was used for the analysis of serum SIRT1, HMGB1, TLR4, NF-kB, IL-6, Aβ-42, and p-tau181 levels. RESULTS Levels of serum Aβ-42, SIRT1, HMGB1, and IL-6 were significantly higher (p˂0.001, p<0.01, p<0.001, and p<0.001, respectively), and TLR4 levels were significantly lower (p˂0.001) in the dementia group than in the control group. No significant difference was observed between dementia and control groups for serum NF-kB and p-tau181 levels. CONCLUSION Our results show that the levels of the Aβ42, SIRT 1, HMGB1, and TLR4 pathways are altered in AD and VD. SIRT 1 activity plays an important role in the inflammatory pathway of dementia development, particularly in AD.
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Affiliation(s)
- Nazrin Gulmammadli
- Department of Biochemistry, Cerrahpaşa Faculty of Medicine, İstanbul University-Cerrahpaşa, İstanbul, Turkey
| | - Dildar Konukoğlu
- Department of Biochemistry, Cerrahpaşa Faculty of Medicine, İstanbul University-Cerrahpaşa, İstanbul, Turkey
| | - Eda Merve Kurtuluş
- Department of Nutrition and Dietetics, Faculty of Health Sciences, İstanbul Gelişim University, İstanbul, Turkey
| | - Didem Tezen
- Department of Neurology, Cerrahpaşa Faculty of Medicine, İstanbul University-Cerrahpaşa, İstanbul, Turkey
| | - Muhammed Ibrahim Erbay
- Department of Biochemistry, Cerrahpaşa Faculty of Medicine, İstanbul University-Cerrahpaşa, İstanbul, Turkey
| | - Melda Bozluolçay
- Department of Neurology, Cerrahpaşa Faculty of Medicine, İstanbul University-Cerrahpaşa, İstanbul, Turkey
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Manet C, Mansuroglu Z, Conquet L, Bortolin V, Comptdaer T, Segrt H, Bourdon M, Menidjel R, Stadler N, Tian G, Herit F, Niedergang F, Souès S, Buée L, Galas MC, Montagutelli X, Bonnefoy E. Zika virus infection of mature neurons from immunocompetent mice generates a disease-associated microglia and a tauopathy-like phenotype in link with a delayed interferon beta response. J Neuroinflammation 2022; 19:307. [PMID: 36539803 PMCID: PMC9764315 DOI: 10.1186/s12974-022-02668-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 12/08/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Zika virus (ZIKV) infection at postnatal or adult age can lead to neurological disorders associated with cognitive defects. Yet, how mature neurons respond to ZIKV remains substantially unexplored. METHODS The impact of ZIKV infection on mature neurons and microglia was analyzed at the molecular and cellular levels, in vitro using immunocompetent primary cultured neurons and microglia, and in vivo in the brain of adult immunocompetent mice following intracranial ZIKV inoculation. We have used C57BL/6 and the genetically diverse Collaborative Cross mouse strains, displaying a broad range of susceptibility to ZIKV infection, to question the correlation between the effects induced by ZIKV infection on neurons and microglia and the in vivo susceptibility to ZIKV. RESULTS As a result of a delayed induction of interferon beta (IFNB) expression and response, infected neurons displayed an inability to stop ZIKV replication, a trait that was further increased in neurons from susceptible mice. Alongside with an enhanced expression of ZIKV RNA, we observed in vivo, in the brain of susceptible mice, an increased level of active Iba1-expressing microglial cells occasionally engulfing neurons and displaying a gene expression profile close to the molecular signature of disease-associated microglia (DAM). In vivo as well as in vitro, only neurons and not microglial cells were identified as infected, raising the question of the mechanisms underlying microglia activation following brain ZIKV infection. Treatment of primary cultured microglia with conditioned media from ZIKV-infected neurons demonstrated that type-I interferons (IFNs-I) secreted by neurons late after infection activate non-infected microglial cells. In addition, ZIKV infection induced pathological phosphorylation of Tau (pTau) protein, a hallmark of neurodegenerative tauopathies, in vitro and in vivo with clusters of neurons displaying pTau surrounded by active microglial cells. CONCLUSIONS We show that ZIKV-infected mature neurons display an inability to stop viral replication in link with a delayed IFNB expression and response, while signaling microglia for activation through IFNs-I secreted at late times post-infection. In the brain of ZIKV-infected susceptible mice, uninfected microglial cells adopt an active morphology and a DAM expression profile, surrounding and sometimes engulfing neurons while ZIKV-infected neurons accumulate pTau, overall reflecting a tauopathy-like phenotype.
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Affiliation(s)
- Caroline Manet
- grid.5842.b0000 0001 2171 2558Institut Pasteur, Mouse Genetics Laboratory, Université de Paris, 75015 Paris, France
| | - Zeyni Mansuroglu
- grid.462098.10000 0004 0643 431XUniversité Paris Cité, Institut Cochin, Inserm, CNRS, 75014 Paris, France
| | - Laurine Conquet
- grid.5842.b0000 0001 2171 2558Institut Pasteur, Mouse Genetics Laboratory, Université de Paris, 75015 Paris, France
| | - Violaine Bortolin
- grid.462098.10000 0004 0643 431XUniversité Paris Cité, Institut Cochin, Inserm, CNRS, 75014 Paris, France
| | - Thomas Comptdaer
- grid.503422.20000 0001 2242 6780University Lille, Inserm, CHU Lille, Inserm, LilNCog - Lille Neuroscience & Cognition, 59000 Lille, France
| | - Helena Segrt
- grid.462098.10000 0004 0643 431XUniversité Paris Cité, Institut Cochin, Inserm, CNRS, 75014 Paris, France
| | - Marie Bourdon
- grid.5842.b0000 0001 2171 2558Institut Pasteur, Mouse Genetics Laboratory, Université de Paris, 75015 Paris, France
| | - Reyene Menidjel
- grid.462098.10000 0004 0643 431XUniversité Paris Cité, Institut Cochin, Inserm, CNRS, 75014 Paris, France
| | - Nicolas Stadler
- grid.508487.60000 0004 7885 7602Université Paris Cité, Inserm UMR1124, 75006 Paris, France
| | - Guanfang Tian
- grid.462098.10000 0004 0643 431XUniversité Paris Cité, Institut Cochin, Inserm, CNRS, 75014 Paris, France
| | - Floriane Herit
- grid.462098.10000 0004 0643 431XUniversité Paris Cité, Institut Cochin, Inserm, CNRS, 75014 Paris, France
| | - Florence Niedergang
- grid.462098.10000 0004 0643 431XUniversité Paris Cité, Institut Cochin, Inserm, CNRS, 75014 Paris, France
| | - Sylvie Souès
- grid.462098.10000 0004 0643 431XUniversité Paris Cité, Institut Cochin, Inserm, CNRS, 75014 Paris, France
| | - Luc Buée
- grid.503422.20000 0001 2242 6780University Lille, Inserm, CHU Lille, Inserm, LilNCog - Lille Neuroscience & Cognition, 59000 Lille, France
| | - Marie-Christine Galas
- grid.503422.20000 0001 2242 6780University Lille, Inserm, CHU Lille, Inserm, LilNCog - Lille Neuroscience & Cognition, 59000 Lille, France
| | - Xavier Montagutelli
- grid.5842.b0000 0001 2171 2558Institut Pasteur, Mouse Genetics Laboratory, Université de Paris, 75015 Paris, France
| | - Eliette Bonnefoy
- grid.462098.10000 0004 0643 431XUniversité Paris Cité, Institut Cochin, Inserm, CNRS, 75014 Paris, France
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Tang C, Jin Y, Wang H. The biological alterations of synapse/synapse formation in sepsis-associated encephalopathy. Front Synaptic Neurosci 2022; 14:1054605. [DOI: 10.3389/fnsyn.2022.1054605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 11/18/2022] [Indexed: 12/03/2022] Open
Abstract
Sepsis-associated encephalopathy (SAE) is a common complication caused by sepsis, and is responsible for increased mortality and poor outcomes in septic patients. Neurological dysfunction is one of the main manifestations of SAE patients. Patients may still have long-term cognitive impairment after hospital discharge, and the underlying mechanism is still unclear. Here, we first outline the pathophysiological changes of SAE, including neuroinflammation, glial activation, and blood-brain barrier (BBB) breakdown. Synapse dysfunction is one of the main contributors leading to neurological impairment. Therefore, we summarized SAE-induced synaptic dysfunction, such as synaptic plasticity inhibition, neurotransmitter imbalance, and synapses loss. Finally, we discuss the alterations in the synapse, synapse formation, and mediators associated with synapse formation during SAE. In this review, we focus on the changes in synapse/synapse formation caused by SAE, which can further understand the synaptic dysfunction associated with neurological impairment in SAE and provide important insights for exploring appropriate therapeutic targets of SAE.
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108
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Bi W, Lei T, Cai S, Zhang X, Yang Y, Xiao Z, Wang L, Du H. Potential of astrocytes in targeting therapy for Alzheimer’s disease. Int Immunopharmacol 2022; 113:109368. [DOI: 10.1016/j.intimp.2022.109368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 10/06/2022] [Accepted: 10/15/2022] [Indexed: 11/05/2022]
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Phadke L, Lau DHW, Aghaizu ND, Ibarra S, Navarron CM, Granat L, Magno L, Whiting P, Jolly S. A primary rodent triculture model to investigate the role of glia-neuron crosstalk in regulation of neuronal activity. Front Aging Neurosci 2022; 14:1056067. [DOI: 10.3389/fnagi.2022.1056067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 11/07/2022] [Indexed: 12/03/2022] Open
Abstract
Neuroinflammation and hyperexcitability have been implicated in the pathogenesis of neurodegenerative disease, and new models are required to investigate the cellular crosstalk involved in these processes. We developed an approach to generate a quantitative and reproducible triculture system that is suitable for pharmacological studies. While primary rat cells were previously grown in a coculture medium formulated to support only neurons and astrocytes, we now optimised a protocol to generate tricultures containing neurons, astrocytes and microglia by culturing in a medium designed to support all three cell types and adding exogenous microglia to cocultures. Immunocytochemistry was used to confirm the intended cell types were present. The percentage of ramified microglia in the tricultures decreases as the number of microglia present increases. Multi-electrode array recordings indicate that microglia in the triculture model suppress neuronal activity in a dose-dependent manner. Neurons in both cocultures and tricultures are responsive to the potassium channel blocker 4-aminopyridine, suggesting that neurons remained viable and functional in the triculture model. Furthermore, suppressed neuronal activity in tricultures correlates with decreased densities of dendritic spines and of the postsynaptic protein Homer1 along dendrites, indicative of a direct or indirect effect of microglia on synapse function. We thus present a functional triculture model, which, due to its more complete cellular composition, is a more relevant model than standard cocultures. The model can be used to probe glia-neuron interactions and subsequently aid the development of assays for drug discovery, using neuronal excitability as a functional endpoint.
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Zhang S, Meng Y, Zhou L, Qiu L, Wang H, Su D, Zhang B, Chan K, Han J. Targeting epigenetic regulators for inflammation: Mechanisms and intervention therapy. MedComm (Beijing) 2022; 3:e173. [PMID: 36176733 PMCID: PMC9477794 DOI: 10.1002/mco2.173] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/28/2022] [Accepted: 08/05/2022] [Indexed: 11/11/2022] Open
Abstract
Emerging evidence indicates that resolution of inflammation is a critical and dynamic endogenous process for host tissues defending against external invasive pathogens or internal tissue injury. It has long been known that autoimmune diseases and chronic inflammatory disorders are characterized by dysregulated immune responses, leading to excessive and uncontrol tissue inflammation. The dysregulation of epigenetic alterations including DNA methylation, posttranslational modifications to histone proteins, and noncoding RNA expression has been implicated in a host of inflammatory disorders and the immune system. The inflammatory response is considered as a critical trigger of epigenetic alterations that in turn intercede inflammatory actions. Thus, understanding the molecular mechanism that dictates the outcome of targeting epigenetic regulators for inflammatory disease is required for inflammation resolution. In this article, we elucidate the critical role of the nuclear factor‐κB signaling pathway, JAK/STAT signaling pathway, and the NLRP3 inflammasome in chronic inflammatory diseases. And we formulate the relationship between inflammation, coronavirus disease 2019, and human cancers. Additionally, we review the mechanism of epigenetic modifications involved in inflammation and innate immune cells. All that matters is that we propose and discuss the rejuvenation potential of interventions that target epigenetic regulators and regulatory mechanisms for chronic inflammation‐associated diseases to improve therapeutic outcomes.
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Affiliation(s)
- Su Zhang
- Laboratory of Cancer Epigenetics and Genomics Frontiers Science Center for Disease‐Related Molecular Network State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu China
| | - Yang Meng
- Laboratory of Cancer Epigenetics and Genomics Frontiers Science Center for Disease‐Related Molecular Network State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu China
| | - Lian Zhou
- Laboratory of Cancer Epigenetics and Genomics Frontiers Science Center for Disease‐Related Molecular Network State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu China
| | - Lei Qiu
- Laboratory of Cancer Epigenetics and Genomics Frontiers Science Center for Disease‐Related Molecular Network State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu China
| | - Heping Wang
- Department of Neurosurgery Tongji Hospital of Tongji Medical College Huazhong University of Science and Technology Wuhan China
| | - Dan Su
- Laboratory of Cancer Epigenetics and Genomics Frontiers Science Center for Disease‐Related Molecular Network State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu China
| | - Bo Zhang
- Laboratory of Cancer Epigenetics and Genomics Department of Gastrointestinal Surgery Frontiers Science Center for Disease‐Related Molecular Network West China Hospital Sichuan University Chengdu China
| | - Kui‐Ming Chan
- Department of Biomedical Sciences City University of Hong Kong Hong Kong China
| | - Junhong Han
- Laboratory of Cancer Epigenetics and Genomics Frontiers Science Center for Disease‐Related Molecular Network State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu China
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Plasma complement C3 and C3a are increased in major depressive disorder independent of childhood trauma. BMC Psychiatry 2022; 22:741. [PMID: 36447174 PMCID: PMC9706857 DOI: 10.1186/s12888-022-04410-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 11/21/2022] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Dysregulated complement system is linked to pathophysiology of major depressive disorder (MDD). Childhood trauma has been associated with an increased incidence of adult depression via a putative mechanism of immune activation. This study aimed to measure and compare peripheral levels of complement C3, C3a, C1q and C-reactive protein (CRP) in MDD patients and healthy controls and explore the relationship between these molecule levels and childhood trauma history in the participants. METHODS The participants were 49 medication-free MDD patients and 45 healthy controls. All participants were asked to finish the Childhood Trauma Questionnaire, followed by blood sampling for measurement of plasma complement C3, C3a, C1q and CRP by means of enzyme-linked immunosorbent assay. RESULTS Peripheral plasma concentration of C3 and C3a in medication-free MDD group was significantly higher than that in the healthy controls; whereas the concentration of plasma C1q and CRP in depressed patients was comparable to that in healthy controls. All these inflammatory factors were not associated to childhood trauma experience in patients with MDD. CONCLUSION Our data suggest that complement C3 and C3a may be implicated in the pathophysiology of MDD, although traumatic childhood experiences were not associated with the circulating levels of complement C3, C3a, C1q and CRP.
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Saavedra J, Nascimento M, Liz MA, Cardoso I. Key brain cell interactions and contributions to the pathogenesis of Alzheimer’s disease. Front Cell Dev Biol 2022; 10:1036123. [DOI: 10.3389/fcell.2022.1036123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Accepted: 11/14/2022] [Indexed: 12/02/2022] Open
Abstract
Alzheimer’s disease (AD) is the most common neurodegenerative disease worldwide, with the two major hallmarks being the deposition of extracellular β-amyloid (Aβ) plaques and of intracellular neurofibrillary tangles (NFTs). Additionally, early pathological events such as cerebrovascular alterations, a compromised blood-brain barrier (BBB) integrity, neuroinflammation and synaptic dysfunction, culminate in neuron loss and cognitive deficits. AD symptoms reflect a loss of neuronal circuit integrity in the brain; however, neurons do not operate in isolation. An exclusively neurocentric approach is insufficient to understand this disease, and the contribution of other brain cells including astrocytes, microglia, and vascular cells must be integrated in the context. The delicate balance of interactions between these cells, required for healthy brain function, is disrupted during disease. To design successful therapies, it is critical to understand the complex brain cellular connections in AD and the temporal sequence of their disturbance. In this review, we discuss the interactions between different brain cells, from physiological conditions to their pathological reactions in AD, and how this basic knowledge can be crucial for developing new therapeutic strategies.
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113
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Tang Y, Chen Y, Chen D. The heterogeneity of astrocytes in glaucoma. Front Neuroanat 2022; 16:995369. [PMID: 36466782 PMCID: PMC9714578 DOI: 10.3389/fnana.2022.995369] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 10/31/2022] [Indexed: 09/10/2023] Open
Abstract
Glaucoma is a leading cause of blindness with progressive degeneration of retinal ganglion cells. Aging and increased intraocular pressure (IOP) are major risk factors. Lowering IOP does not always stop the disease progression. Alternative ways of protecting the optic nerve are intensively studied in glaucoma. Astrocytes are macroglia residing in the retina, optic nerve head (ONH), and visual brain, which keep neuronal homeostasis, regulate neuronal activities and are part of the immune responses to the retina and brain insults. In this brief review, we discuss the activation and heterogeneity of astrocytes in the retina, optic nerve head, and visual brain of glaucoma patients and animal models. We also discuss some recent transgenic and gene knockout studies using glaucoma mouse models to clarify the role of astrocytes in the pathogenesis of glaucoma. Astrocytes are heterogeneous and play crucial roles in the pathogenesis of glaucoma, especially in the process of neuroinflammation and mitochondrial dysfunction. In astrocytes, overexpression of Stat3 or knockdown of IκKβ/p65, caspase-8, and mitochondrial uncoupling proteins (Ucp2) can reduce ganglion cell loss in glaucoma mouse models. Based on these studies, therapeutic strategies targeting the heterogeneity of reactive astrocytes by enhancing their beneficial reactivity or suppressing their detrimental reactivity are alternative options for glaucoma treatment in the future.
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Affiliation(s)
- Yunjing Tang
- Research Laboratory of Ophthalmology and Vision Sciences, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, China
| | - Yongjiang Chen
- The School of Optometry and Vision Science, University of Waterloo, Waterloo, ON, Canada
| | - Danian Chen
- Research Laboratory of Ophthalmology and Vision Sciences, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, China
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114
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Lee D, Lee VMY, Hur SK. Manipulation of the diet-microbiota-brain axis in Alzheimer's disease. Front Neurosci 2022; 16:1042865. [PMID: 36408394 PMCID: PMC9672822 DOI: 10.3389/fnins.2022.1042865] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 10/14/2022] [Indexed: 11/06/2022] Open
Abstract
Several studies investigating the pathogenesis of Alzheimer's disease have identified various interdependent constituents contributing to the exacerbation of the disease, including Aβ plaque formation, tau protein hyperphosphorylation, neurofibrillary tangle accumulation, glial inflammation, and the eventual loss of proper neural plasticity. Recently, using various models and human patients, another key factor has been established as an influential determinant in brain homeostasis: the gut-brain axis. The implications of a rapidly aging population and the absence of a definitive cure for Alzheimer's disease have prompted a search for non-pharmaceutical tools, of which gut-modulatory therapies targeting the gut-brain axis have shown promise. Yet multiple recent studies examining changes in human gut flora in response to various probiotics and environmental factors are limited and difficult to generalize; whether the state of the gut microbiota in Alzheimer's disease is a cause of the disease, a result of the disease, or both through numerous feedback loops in the gut-brain axis, remains unclear. However, preliminary findings of longitudinal studies conducted over the past decades have highlighted dietary interventions, especially Mediterranean diets, as preventative measures for Alzheimer's disease by reversing neuroinflammation, modifying the intestinal and blood-brain barrier (BBB), and addressing gut dysbiosis. Conversely, the consumption of Western diets intensifies the progression of Alzheimer's disease through genetic alterations, impaired barrier function, and chronic inflammation. This review aims to support the growing body of experimental and clinical data highlighting specific probiotic strains and particular dietary components in preventing Alzheimer's disease via the gut-brain axis.
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Affiliation(s)
- Daniel Lee
- Middleton High School, Middleton, WI, United States
| | - Virginia M-Y. Lee
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
- Center for Neurodegenerative Disease Research, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, United States
| | - Seong Kwon Hur
- Center for Neurodegenerative Disease Research, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, United States
- Department of Neuroscience, Genentech, Inc., South San Francisco, CA, United States
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115
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Savya SP, Li F, Lam S, Wellman SM, Stieger KC, Chen K, Eles JR, Kozai TDY. In vivo spatiotemporal dynamics of astrocyte reactivity following neural electrode implantation. Biomaterials 2022; 289:121784. [PMID: 36103781 PMCID: PMC10231871 DOI: 10.1016/j.biomaterials.2022.121784] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/24/2022] [Accepted: 08/29/2022] [Indexed: 11/02/2022]
Abstract
Brain computer interfaces (BCIs), including penetrating microelectrode arrays, enable both recording and stimulation of neural cells. However, device implantation inevitably causes injury to brain tissue and induces a foreign body response, leading to reduced recording performance and stimulation efficacy. Astrocytes in the healthy brain play multiple roles including regulating energy metabolism, homeostatic balance, transmission of neural signals, and neurovascular coupling. Following an insult to the brain, they are activated and gather around the site of injury. These reactive astrocytes have been regarded as one of the main contributors to the formation of a glial scar which affects the performance of microelectrode arrays. This study investigates the dynamics of astrocytes within the first 2 weeks after implantation of an intracortical microelectrode into the mouse brain using two-photon microscopy. From our observation astrocytes are highly dynamic during this period, exhibiting patterns of process extension, soma migration, morphological activation, and device encapsulation that are spatiotemporally distinct from other glial cells, such as microglia or oligodendrocyte precursor cells. This detailed characterization of astrocyte reactivity will help to better understand the tissue response to intracortical devices and lead to the development of more effective intervention strategies to improve the functional performance of neural interfacing technology.
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Affiliation(s)
- Sajishnu P Savya
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Northwestern University, USA
| | - Fan Li
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Center for Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA, USA; Computational Modeling & Simulation PhD Program, University of Pittsburgh, Pittsburgh, PA, USA
| | - Stephanie Lam
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Center for Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA, USA
| | - Steven M Wellman
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Center for Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA, USA
| | - Kevin C Stieger
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Center for Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA, USA
| | - Keying Chen
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Center for Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA, USA
| | - James R Eles
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Center for Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA, USA
| | - Takashi D Y Kozai
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Center for Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA, USA; Center for Neuroscience, University of Pittsburgh, University of Pittsburgh, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA; NeuroTech Center, University of Pittsburgh Brain Institute, Pittsburgh, PA, USA.
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116
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Xu J, Zheng Y, Wang L, Liu Y, Wang X, Li Y, Chi G. miR-124: A Promising Therapeutic Target for Central Nervous System Injuries and Diseases. Cell Mol Neurobiol 2022; 42:2031-2053. [PMID: 33886036 DOI: 10.1007/s10571-021-01091-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 04/12/2021] [Indexed: 02/07/2023]
Abstract
Central nervous system injuries and diseases, such as ischemic stroke, spinal cord injury, neurodegenerative diseases, glioblastoma, multiple sclerosis, and the resulting neuroinflammation often lead to death or long-term disability. MicroRNAs are small, non-coding, single-stranded RNAs that regulate posttranscriptional gene expression in both physiological and pathological cellular processes, including central nervous system injuries and disorders. Studies on miR-124, one of the most abundant microRNAs in the central nervous system, have shown that its dysregulation is related to the occurrence and development of pathology within the central nervous system. Herein, we review the molecular regulatory functions, underlying mechanisms, and effective delivery methods of miR-124 in the central nervous system, where it is involved in pathological conditions. The review also provides novel insights into the therapeutic target potential of miR-124 in the treatment of human central nervous system injuries or diseases.
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Affiliation(s)
- Jinying Xu
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, Changchun, 130000, People's Republic of China
| | - Yangyang Zheng
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, Changchun, 130000, People's Republic of China
| | - Liangjia Wang
- Clinical Medical College, Jilin University, Changchun, 130000, People's Republic of China
| | - Yining Liu
- Clinical Medical College, Jilin University, Changchun, 130000, People's Republic of China
| | - Xishu Wang
- Clinical Medical College, Jilin University, Changchun, 130000, People's Republic of China
| | - Yulin Li
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, Changchun, 130000, People's Republic of China.
| | - Guangfan Chi
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, Changchun, 130000, People's Republic of China.
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Jana A, Wang X, Leasure JW, Magana L, Wang L, Kim YM, Dodiya H, Toth PT, Sisodia SS, Rehman J. Increased Type I interferon signaling and brain endothelial barrier dysfunction in an experimental model of Alzheimer's disease. Sci Rep 2022; 12:16488. [PMID: 36182964 PMCID: PMC9526723 DOI: 10.1038/s41598-022-20889-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Accepted: 09/19/2022] [Indexed: 11/09/2022] Open
Abstract
Blood-brain barrier (BBB) dysfunction is emerging as a key pathogenic factor in the progression of Alzheimer's disease (AD), where increased microvascular endothelial permeability has been proposed to play an important role. However, the molecular mechanisms leading to increased brain microvascular permeability in AD are not fully understood. We studied brain endothelial permeability in female APPswe/PS1∆E9 (APP/PS1) mice which constitute a transgenic mouse model of amyloid-beta (Aβ) amyloidosis and found that permeability increases with aging in the areas showing the greatest amyloid plaque deposition. We performed an unbiased bulk RNA-sequencing analysis of brain endothelial cells (BECs) in female APP/PS1 transgenic mice. We observed that upregulation of interferon signaling gene expression pathways in BECs was among the most prominent transcriptomic signatures in the brain endothelium. Immunofluorescence analysis of isolated BECs from female APP/PS1 mice demonstrated higher levels of the Type I interferon-stimulated gene IFIT2. Immunoblotting of APP/PS1 BECs showed downregulation of the adherens junction protein VE-cadherin. Stimulation of human brain endothelial cells with interferon-β decreased the levels of the adherens junction protein VE-cadherin as well as tight junction proteins Occludin and Claudin-5 and increased barrier leakiness. Depletion of the Type I interferon receptor in human brain endothelial cells prevented interferon-β-induced VE-cadherin downregulation and restored endothelial barrier integrity. Our study suggests that Type I interferon signaling contributes to brain endothelial dysfunction in AD.
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Affiliation(s)
- Arundhati Jana
- Division of Cardiology, Department of Medicine, College of Medicine, University of Illinois, Chicago, IL, 60612, USA
| | - Xinge Wang
- Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, IL, 60612, USA.,Department of Biochemistry and Molecular Genetics, University of Illinois, College of Medicine, Chicago, IL, 60607, USA
| | - Joseph W Leasure
- Department of Biochemistry and Molecular Genetics, University of Illinois, College of Medicine, Chicago, IL, 60607, USA
| | - Lissette Magana
- Department of Biochemistry and Molecular Genetics, University of Illinois, College of Medicine, Chicago, IL, 60607, USA
| | - Li Wang
- Division of Cardiology, Department of Medicine, College of Medicine, University of Illinois, Chicago, IL, 60612, USA.,Department of Biochemistry and Molecular Genetics, University of Illinois, College of Medicine, Chicago, IL, 60607, USA
| | - Young-Mee Kim
- Division of Cardiology, Department of Medicine, College of Medicine, University of Illinois, Chicago, IL, 60612, USA.,Department of Biochemistry and Molecular Genetics, University of Illinois, College of Medicine, Chicago, IL, 60607, USA
| | - Hemraj Dodiya
- Department of Neurobiology, University of Chicago, Chicago, IL, 60637, USA.,The Microbiome Center, University of Chicago, Chicago, IL, 60637, USA
| | - Peter T Toth
- Research Resources Center, University of Chicago, Chicago, IL, 60612, USA.,Department of Pharmacology and Regenerative Medicine, University of Chicago, Chicago, IL, 60612, USA
| | - Sangram S Sisodia
- Department of Neurobiology, University of Chicago, Chicago, IL, 60637, USA.,The Microbiome Center, University of Chicago, Chicago, IL, 60637, USA
| | - Jalees Rehman
- Division of Cardiology, Department of Medicine, College of Medicine, University of Illinois, Chicago, IL, 60612, USA. .,Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, IL, 60612, USA. .,Department of Biochemistry and Molecular Genetics, University of Illinois, College of Medicine, Chicago, IL, 60607, USA. .,Department of Pharmacology and Regenerative Medicine, University of Chicago, Chicago, IL, 60612, USA.
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118
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Lai X, Wang Y, Wang X, Liu B, Rong L. miR-146a-5p-modified hUCMSC-derived exosomes facilitate spinal cord function recovery by targeting neurotoxic astrocytes. Stem Cell Res Ther 2022; 13:487. [PMID: 36175984 PMCID: PMC9524140 DOI: 10.1186/s13287-022-03116-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 08/04/2022] [Indexed: 11/10/2022] Open
Abstract
Background Acute spinal cord injury (SCI) is a devastating result of neurological trauma with subsequent microenvironment dyshomeostasis that induces neurotoxic phenotype acquisition by astrocytes, exacerbating neurological function impairment. Exosomes derived from human umbilical cord mesenchymal stem cells (hUCMSCs) have demonstrated essential therapeutic effects after central nervous system trauma. However, whether hUCMSC-derived exosomes exert therapeutic effects on neurotoxic astrocytes to facilitate SCI function recovery remains unclear. Additionally, the limited efficiency of single exosomes may restrict the optimization of exosomal biological functions.
Methods We first determined that exosomes reduce the deleterious effects of neurotoxic astrocytes in vitro and in vivo. Then, we identified critical functional microRNAs (miRNAs). miR-146a-5p was overexpressed in exosomes, and then, miR-146a-5p-modified exosomes were used to investigate the ability of exosomes to reduce neurotoxic astrocyte effects, preserve neurons and promote neurological function recovery in rats with SCI. Results Cell counting kit-8 and neurite length analyses revealed that exosomes partially reduced the negative effects of neurotoxic astrocytes on PC12 cell viability and neurites in vitro. The exosomes also attenuated inflammatory responses, reduced the number of neurotoxic astrocytes and preserved neural tissue in rats with SCI. Immunofluorescence assays suggested that the number of neurotoxic astrocytes was rapidly increased by injury, reaching a peak 5 days post-injury (dpi) and returning to the normal level 14dpi. Exosomal miR-146a-5p was identified as the critical functional miRNA. Overexpression of miR-146a-5p in exosomes strengthened the biological function of the exosomes. Therefore, the modified exosomes exerted more powerful therapeutic effects than the unmodified exosomes, reducing the deleterious effects of neurotoxic astrocytes both in vitro and in vivo and promoting locomotor function of the hindlimbs in the rats with SCI. Through a series of gain- and loss-of-function experiments, Traf6 and Irak1 were identified as targets of exosomal miR-146a-5p. Ultimately, we found that miR-146a-5p-modified exosomes exerted their function by targeting Traf6/Irak1/NFκB pathway in neurotoxic astrocytes. Conclusions In summary, miR-146a-5p-modified exosomes exerted a more powerful effect than unmodified exosomes to promote neurological function recovery in rats with SCI by targeting neurotoxic astrocytes. Therefore, miR-146a-5p-modified exosomes are promising therapeutics for SCI. Supplementary Information The online version contains supplementary material available at 10.1186/s13287-022-03116-3.
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Affiliation(s)
- Xunwei Lai
- Department of Spine Surgery, The Third Affiliated Hospital of Sun Yat-sen University, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,National Medical Products Administration (NMPA) Key Laboratory for Quality Research and Evaluation of Cell Products, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,Guangdong Provincial Center for Engineering and Technology Research of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,Guangdong Provincial Center for Quality Control of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China
| | - Yang Wang
- Department of Spine Surgery, The Third Affiliated Hospital of Sun Yat-sen University, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,National Medical Products Administration (NMPA) Key Laboratory for Quality Research and Evaluation of Cell Products, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,Guangdong Provincial Center for Engineering and Technology Research of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,Guangdong Provincial Center for Quality Control of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China
| | - Xiaokang Wang
- Department of Spine Surgery, The Third Affiliated Hospital of Sun Yat-sen University, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,National Medical Products Administration (NMPA) Key Laboratory for Quality Research and Evaluation of Cell Products, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,Guangdong Provincial Center for Engineering and Technology Research of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,Guangdong Provincial Center for Quality Control of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China
| | - Bin Liu
- Department of Spine Surgery, The Third Affiliated Hospital of Sun Yat-sen University, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,National Medical Products Administration (NMPA) Key Laboratory for Quality Research and Evaluation of Cell Products, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,Guangdong Provincial Center for Engineering and Technology Research of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.,Guangdong Provincial Center for Quality Control of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China
| | - Limin Rong
- Department of Spine Surgery, The Third Affiliated Hospital of Sun Yat-sen University, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China. .,National Medical Products Administration (NMPA) Key Laboratory for Quality Research and Evaluation of Cell Products, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China. .,Guangdong Provincial Center for Engineering and Technology Research of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China. .,Guangdong Provincial Center for Quality Control of Minimally Invasive Spine Surgery, No. 600 Tianhe Road, Tianhe District, Guangzhou, Guangdong Province, China.
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119
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The complement C3-complement factor D-C3a receptor signalling axis regulates cardiac remodelling in right ventricular failure. Nat Commun 2022; 13:5409. [PMID: 36109509 PMCID: PMC9478115 DOI: 10.1038/s41467-022-33152-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 08/25/2022] [Indexed: 11/24/2022] Open
Abstract
Failure of the right ventricle plays a critical role in any type of heart failure. However, the mechanism remains unclear, and there is no specific therapy. Here, we show that the right ventricle predominantly expresses alternative complement pathway-related genes, including Cfd and C3aR1. Complement 3 (C3)-knockout attenuates right ventricular dysfunction and fibrosis in a mouse model of right ventricular failure. C3a is produced from C3 by the C3 convertase complex, which includes the essential component complement factor D (Cfd). Cfd-knockout mice also show attenuation of right ventricular failure. Moreover, the plasma concentration of CFD correlates with the severity of right ventricular failure in patients with chronic right ventricular failure. A C3a receptor (C3aR) antagonist dramatically improves right ventricular dysfunction in mice. In summary, we demonstrate the crucial role of the C3-Cfd-C3aR axis in right ventricular failure and highlight potential therapeutic targets for right ventricular failure. Right ventricular (RV) failure is clinically crucial, but there is no specific therapy. Here, the authors show that the complement alternative pathway is activated in RV failure and that blockade of the pathway ameliorates RV failure in mice.
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120
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Zhang Y, Wang X, Jiang C, Chen Z, Ni S, Fan H, Wang Z, Tian F, An J, Yang H, Hao D. Rho Kinase Inhibitor Y27632 Improves Recovery After Spinal Cord Injury by Shifting Astrocyte Phenotype and Morphology via the ROCK/NF-κB/C3 Pathway. Neurochem Res 2022; 47:3733-3744. [DOI: 10.1007/s11064-022-03756-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 09/05/2022] [Accepted: 09/06/2022] [Indexed: 11/28/2022]
Abstract
AbstractSpinal cord injury (SCI) usually results in loss or reduction in motor and sensory functions. Despite extensive research, no available therapy can restore the lost functions after SCI. Reactive astrocytes play a pivotal role in SCI. Rho kinase inhibitors have also been shown to promote functional recovery of SCI. However, the role of Rho kinase inhibitors in reactive astrocytic phenotype switch within SCI remains largely unexplored. In this study, astrocytes were treated with proinflammatory cytokines and/or the Rho kinase inhibitor Y27632. Concomitantly the phenotype and morphology of astrocytes were examined. Meanwhile, the SCI model of SD rats was established, and nerve functions were evaluated following treatment with Y27632. Subsequently, the number of A1 astrocytes in the injured area was observed and analyzed. Eventually, the expression levels of nuclear factor kappa B (NF-κB), C3, and S100A10 were measured. The present study showed that the Rho kinase inhibitor Y27632 improved functional recovery of SCI and elevated the proliferation and migration abilities of the astrocytes. In addition, Y27632 treatment initiated the switch of astrocytes morphology from a flattened shape to a process-bearing shape and transformed the reactive astrocytes A1 phenotype to an A2 phenotype. More importantly, further investigation suggested that Y27632 was actively involved in promoting the functional recovery of SCI in rats by inhabiting the ROCK/NF-κB/C3 signaling pathway. Together, Rho kinase inhibitor Y27632 effectively promotes the functional recovery of SCI by shifting astrocyte phenotype and morphology. Furthermore, the pro-regeneration event is strongly associated with the ROCK/NF-κB/C3 signal pathway.
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Zhou M, Zhang T, Zhang X, Zhang M, Gao S, Zhang T, Li S, Cai X, Li J, Lin Y. Effect of Tetrahedral Framework Nucleic Acids on Neurological Recovery via Ameliorating Apoptosis and Regulating the Activation and Polarization of Astrocytes in Ischemic Stroke. ACS APPLIED MATERIALS & INTERFACES 2022; 14:37478-37492. [PMID: 35951372 DOI: 10.1021/acsami.2c10364] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Astrocytes, as the most plentiful subtypes of glial cells, play an essential biphasic function in ischemic stroke (IS). However, although having beneficial effects on stroke via promoting nerve restoration and limiting lesion extension, astrocytes can unavoidably cause exacerbated brain damage due to their participation in the inflammatory response. Therefore, seeking an effective and safe drug/strategy for protecting and regulating astrocytes in stroke is urgent. Here, we employ tetrahedral framework nucleic acid (tFNA) nanomaterials for astrocytes in stroke, considering their excellent biological properties and outstanding biosafety. In vitro, tFNA can inhibit calcium overload and ROS regeneration triggered by oxygen-glucose deprivation/reoxygenation (OGD/R), which provides a protective effect against astrocytic apoptosis. Furthermore, morphological changes such as hyperplasia and hypertrophy of reactive astrocytes are restrained, and the astrocytic polarization from the proinflammatory A1 phenotype to the neuroprotective A2 phenotype is facilitated by tFNA, which further alleviates cerebral infarct volume and facilitates the recovery of neurological function in transient middle cerebral artery occlusion (tMCAo) rat models. Moreover, the TLRs/NF-κB signaling pathway is downregulated by tFNA, which may be the potential mechanism of tFNA for protecting astrocytes in stroke. Collectively, we demonstrate that tFNA can effectively mediate astrocytic apoptosis, activation, and polarization to alleviate brain injury, which represents a potential intervention strategy for IS.
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Affiliation(s)
- Mi Zhou
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
| | - Tianxu Zhang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
| | - Xiaolin Zhang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
| | - Mei Zhang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
| | - Shaojingya Gao
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
| | - Tao Zhang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
| | - Songhang Li
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
| | - Xiaoxiao Cai
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
| | - Jun Li
- Orthopedic Research Institute, Department of Orthopedics, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Yunfeng Lin
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
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Singh D. Astrocytic and microglial cells as the modulators of neuroinflammation in Alzheimer's disease. J Neuroinflammation 2022; 19:206. [PMID: 35978311 PMCID: PMC9382837 DOI: 10.1186/s12974-022-02565-0] [Citation(s) in RCA: 77] [Impact Index Per Article: 38.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 08/06/2022] [Indexed: 12/17/2022] Open
Abstract
Neuroinflammation is instigated by the misfiring of immune cells in the central nervous system (CNS) involving microglia and astrocytes as key cell-types. Neuroinflammation is a consequence of CNS injury, infection, toxicity, or autoimmunity. It is favorable as well as a detrimental process for neurodevelopment and associated processes. Transient activation of inflammatory response involving release of cytokines and growth factors positively affects the development and post-injury tissue. However, chronic or uncontrolled inflammatory responses may lead to various neurodegenerative diseases, including Alzheimer's disease (AD), Parkinson's disease (PD), amyotrophic lateral sclerosis, and multiple sclerosis. These diseases have variable clinical and pathological features, but are underlaid by the aggregation of misfolded proteins with a cytotoxic effect. Notably, abnormal activation of glial cells could mediate neuroinflammation, leading to the neurodegenerative condition. Microglia, a type of glial cell, a resident immune cell, form the forefront defense of the CNS immune system. Dysfunctional microglia and astrocyte, a different kind of glial cell with homeostatic function, impairs the protein aggregate (amyloid-beta plaque) clearance in AD. Studies have shown that microglia and astrocytes undergo alterations in their genetic profile, cellular and molecular responses, and thus promote dysfunctional immune cross-talk in AD. Hence, targeting microglia and astrocytes-driven molecular pathways could resolve the particular layers of neuroinflammation and set a reliable therapeutic intervention in AD progression.
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Affiliation(s)
- Deepali Singh
- National Brain Research Centre, Manesar, Haryana, 122052, India.
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Blagburn-Blanco SV, Chappell MS, De Biase LM, DeNardo LA. Synapse-specific roles for microglia in development: New horizons in the prefrontal cortex. Front Mol Neurosci 2022; 15:965756. [PMID: 36003220 PMCID: PMC9394540 DOI: 10.3389/fnmol.2022.965756] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 07/13/2022] [Indexed: 11/19/2022] Open
Abstract
Dysfunction of both microglia and circuitry in the medial prefrontal cortex (mPFC) have been implicated in numerous neuropsychiatric disorders, but how microglia affect mPFC development in health and disease is not well understood. mPFC circuits undergo a prolonged maturation after birth that is driven by molecular programs and activity-dependent processes. Though this extended development is crucial to acquire mature cognitive abilities, it likely renders mPFC circuitry more susceptible to disruption by genetic and environmental insults that increase the risk of developing mental health disorders. Recent work suggests that microglia directly influence mPFC circuit maturation, though the biological factors underlying this observation remain unclear. In this review, we discuss these recent findings along with new studies on the cellular mechanisms by which microglia shape sensory circuits during postnatal development. We focus on the molecular pathways through which glial cells and immune signals regulate synaptogenesis and activity-dependent synaptic refinement. We further highlight how disruptions in these pathways are implicated in the pathogenesis of neurodevelopmental and psychiatric disorders associated with mPFC dysfunction, including schizophrenia and autism spectrum disorder (ASD). Using these disorders as a framework, we discuss microglial mechanisms that could link environmental risk factors including infections and stress with ongoing genetic programs to aberrantly shape mPFC circuitry.
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Affiliation(s)
- Sara V. Blagburn-Blanco
- Neuroscience Interdepartmental Program, University of California, Los Angeles, Los Angeles, CA, United States
- Medical Scientist Training Program, University of California, Los Angeles, Los Angeles, CA, United States
- Department of Physiology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Megan S. Chappell
- Neuroscience Interdepartmental Program, University of California, Los Angeles, Los Angeles, CA, United States
- Department of Physiology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Lindsay M. De Biase
- Department of Physiology, University of California, Los Angeles, Los Angeles, CA, United States
- *Correspondence: Lindsay M. De Biase,
| | - Laura A. DeNardo
- Department of Physiology, University of California, Los Angeles, Los Angeles, CA, United States
- Laura A. DeNardo,
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Ye J, Zhong S, Deng Y, Yao X, Liu Q, Wang JZ, Xiao S. HDAC7 Activates IKK/NF-κB Signaling to Regulate Astrocyte-Mediated Inflammation. Mol Neurobiol 2022; 59:6141-6157. [PMID: 35871708 PMCID: PMC9309093 DOI: 10.1007/s12035-022-02965-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 07/16/2022] [Indexed: 11/28/2022]
Affiliation(s)
- Jinwang Ye
- Shenzhen Key Laboratory of Marine Biotechnology and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060 Guangdong China
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060 China
| | - Suyue Zhong
- Shenzhen Key Laboratory of Marine Biotechnology and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060 Guangdong China
| | - Yunsong Deng
- Shenzhen Key Laboratory of Marine Biotechnology and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060 Guangdong China
| | - Xuanbao Yao
- Shenzhen Key Laboratory of Marine Biotechnology and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060 Guangdong China
| | - Qiong Liu
- Shenzhen Key Laboratory of Marine Biotechnology and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060 Guangdong China
- Shenzhen Bay Laboratory, Shenzhen, 518055 Guangdong China
| | - Jian-Zhi Wang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry of China/Hubei Province for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Shifeng Xiao
- Shenzhen Key Laboratory of Marine Biotechnology and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060 Guangdong China
- Shenzhen Bay Laboratory, Shenzhen, 518055 Guangdong China
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Gong L, Zhu T, Chen C, Xia N, Yao Y, Ding J, Xu P, Li S, Sun Z, Dong X, Shen W, Sun P, Zeng L, Xie Y, Jiang P. Miconazole exerts disease-modifying effects during epilepsy by suppressing neuroinflammation via NF-κB pathway and iNOS production. Neurobiol Dis 2022; 172:105823. [PMID: 35878745 DOI: 10.1016/j.nbd.2022.105823] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 06/29/2022] [Accepted: 07/16/2022] [Indexed: 11/29/2022] Open
Abstract
Neuroinflammation contributes to the generation of epilepsy and has been proposed as an effective therapeutic target. Recent studies have uncovered the potential effects of the anti-fungal drug miconazole for treating various brain diseases by suppressing neuroinflammation but have not yet been studied in epilepsy. Here, we investigated the effects of different doses of miconazole (5, 20, 80 mg/kg) on seizure threshold, inflammatory cytokines release, and glial cells activation in the pilocarpine (PILO) pentylenetetrazole (PTZ), and intrahippocampal kainic acid (IHKA) models. We demonstrated that 5 and 20 mg/kg miconazole increased seizure threshold, but only 20 mg/kg miconazole reduced inflammatory cytokines release, glial cells activation, and morphological alteration during the early post-induction period (24 h, 3 days). We further investigated the effects of 20 mg/kg miconazole on epilepsy (4 weeks after KA injection). We found that miconazole significantly attenuated cytokines production, glial cells activation, microglial morphological changes, frequency and duration of recurrent hippocampal paroxysmal discharges (HPDs), and neuronal and synaptic damage in the hippocampus during epilepsy. In addition, miconazole suppressed the KA-induced activation of the NF-κB pathway and iNOS production. Our results indicated miconazole to be an effective drug for disease-modifying effects during epilepsy, which may act by attenuating neuroinflammation through the suppression of NF-κB activation and iNOS production. At appropriate doses, miconazole may be a safe and effective approved drug that can easily be repositioned for clinical practice.
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Affiliation(s)
- Lifen Gong
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China
| | - Tao Zhu
- Department of Critical Care Medicine, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310020, China
| | - Chen Chen
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China
| | - Ningxiao Xia
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China
| | - Yinping Yao
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China; Department of Pediatrics, Shaoxing People's Hospital, Shaoxing 312300, China
| | - Junchao Ding
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China; Department of Pediatrics, Yiwu Maternity and Children Hospital, Yiwu 322000, China
| | - Peng Xu
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China; Department of Pediatrics, Tongxiang First People's Hospital, Tongxiang 314500, China
| | - Shufen Li
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China; Department of Pediatrics, Lishui Center Hospital, Lishui 323000, China
| | - Zengxian Sun
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China; Department of Pediatrics, Lishui Center Hospital, Lishui 323000, China
| | - Xinyan Dong
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China
| | - Weida Shen
- Department of Pharmacy, Zhejiang University City College School of Medicine, Hangzhou 310015, China
| | - Peng Sun
- Innovation Research Institute of Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan 250355, China
| | - Linghui Zeng
- Department of Pharmacy, Zhejiang University City College School of Medicine, Hangzhou 310015, China.
| | - Yicheng Xie
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China.
| | - Peifang Jiang
- Department of Neurology, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center For Child Health, Hangzhou 310052, China.
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Bacteria reduce flagellin synthesis to evade microglia-astrocyte-driven immunity in the brain. Cell Rep 2022; 40:111033. [PMID: 35793624 DOI: 10.1016/j.celrep.2022.111033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 05/09/2022] [Accepted: 06/13/2022] [Indexed: 11/23/2022] Open
Abstract
The immune response of brain cells to invading bacteria in vivo and the mechanism used by pathogenic bacteria to escape brain immune surveillance remain largely unknown. It is believed that microglia eliminate bacteria by phagocytosis based on in vitro data. Here we find that a small percentage of microglia in the brain engulf neonatal meningitis-causing Escherichia coli (NMEC), but more microglia are activated to produce tumor necrosis factor alpha (TNFα), which activates astrocytes to secrete complement component 3 (C3) involved in anti-bacterial activity. To evade anti-bacterial activity of the immune system, NMEC senses low concentration of threonine in cerebrospinal fluid (CSF) to down-modulate the expression of flagellin and reduce microglial TNFα and astrocyte C3 production. Our findings may help develop strategies for bacterial meningitis treatment.
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Microglial Depletion Has No Impact on Disease Progression in a Mouse Model of Machado–Joseph Disease. Cells 2022; 11:cells11132022. [PMID: 35805106 PMCID: PMC9266279 DOI: 10.3390/cells11132022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 06/18/2022] [Accepted: 06/21/2022] [Indexed: 02/01/2023] Open
Abstract
Machado–Joseph disease (MJD), also known as spinocerebellar ataxia type 3 (SCA3), is an autosomal dominant neurodegenerative disorder (ND). While most research in NDs has been following a neuron-centric point of view, microglia are now recognized as crucial in the brain. Previous work revealed alterations that point to an increased activation state of microglia in the brain of CMVMJD135 mice, a MJD mouse model that replicates the motor symptoms and neuropathology of the human condition. Here, we investigated the extent to which microglia are actively contributing to MJD pathogenesis and symptom progression. For this, we used PLX3397 to reduce the number of microglia in the brain of CMVMJD135 mice. In addition, a set of statistical and machine learning models were further implemented to analyze the impact of PLX3397 on the morphology of the surviving microglia. Then, a battery of behavioral tests was used to evaluate the impact of microglial depletion on the motor phenotype of CMVMJD135 mice. Although PLX3397 treatment substantially reduced microglia density in the affected brain regions, it did not affect the motor deficits seen in CMVMJD135 mice. In addition to reducing the number of microglia, the treatment with PLX3397 induced morphological changes suggestive of activation in the surviving microglia, the microglia of wild-type animals becoming similar to those of CMVMJD135 animals. These results suggest that microglial cells are not key contributors for MJD progression. Furthermore, the impact of PLX3397 on microglial activation should be taken into account in the interpretation of findings of ND modification seen upon treatment with this CSF1R inhibitor.
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Srimani S, Schmidt CX, Gómez-Serranillos MP, Oster H, Divakar PK. Modulation of Cellular Circadian Rhythms by Secondary Metabolites of Lichens. Front Cell Neurosci 2022; 16:907308. [PMID: 35813500 PMCID: PMC9260025 DOI: 10.3389/fncel.2022.907308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 05/20/2022] [Indexed: 12/14/2022] Open
Abstract
Background Most mammalian cells harbor molecular circadian clocks that synchronize physiological functions with the 24-h day-night cycle. Disruption of circadian rhythms, through genetic or environmental changes, promotes the development of disorders like obesity, cardiovascular diseases, and cancer. At the cellular level, circadian, mitotic, and redox cycles are functionally coupled. Evernic (EA) and usnic acid (UA), two lichen secondary metabolites, show various pharmacological activities including anti-oxidative, anti-inflammatory, and neuroprotective action. All these effects have likewise been associated with a functional circadian clock. Hypothesis/Purpose To test, if the lichen compounds EA and UA modulate circadian clock function at the cellular level. Methods We used three different cell lines and two circadian luminescence reporter systems for evaluating dose- and time-dependent effects of EA/UA treatment on cellular clock regulation at high temporal resolution. Output parameters studied were circadian luminescence rhythm period, amplitude, phase, and dampening rate. Results Both compounds had marked effects on clock rhythm amplitudes and dampening independent of cell type, with UA generally showing a higher efficiency than EA. Only in fibroblast cells, significant effects on clock period were observed for UA treated cells showing shorter and EA treated cells showing longer period lengths. Transient treatment of mouse embryonic fibroblasts at different phases had only minor clock resetting effects for both compounds. Conclusion Secondary metabolites of lichen alter cellular circadian clocks through amplitude reduction and increased rhythm dampening.
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Affiliation(s)
- Soumi Srimani
- Institute of Neurobiology, Center of Brain, Behavior & Metabolism (CBBM), University of Lübeck, Lübeck, Germany
- Department of Pharmacology, Pharmacognosy and Botany, Faculty of Pharmacy, Complutense University of Madrid, Madrid, Spain
| | - Cosima Xenia Schmidt
- Institute of Neurobiology, Center of Brain, Behavior & Metabolism (CBBM), University of Lübeck, Lübeck, Germany
| | - Maria Pilar Gómez-Serranillos
- Department of Pharmacology, Pharmacognosy and Botany, Faculty of Pharmacy, Complutense University of Madrid, Madrid, Spain
| | - Henrik Oster
- Institute of Neurobiology, Center of Brain, Behavior & Metabolism (CBBM), University of Lübeck, Lübeck, Germany
| | - Pradeep K. Divakar
- Department of Pharmacology, Pharmacognosy and Botany, Faculty of Pharmacy, Complutense University of Madrid, Madrid, Spain
- *Correspondence: Pradeep K. Divakar
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Hisaoka-Nakashima K, Ohata K, Yoshimoto N, Tokuda S, Yoshii N, Nakamura Y, Wang D, Liu K, Wake H, Yoshida T, Ago Y, Hashimoto K, Nishibori M, Morioka N. High-mobility group box 1-mediated hippocampal microglial activation induces cognitive impairment in mice with neuropathic pain. Exp Neurol 2022; 355:114146. [PMID: 35738416 DOI: 10.1016/j.expneurol.2022.114146] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 06/09/2022] [Accepted: 06/14/2022] [Indexed: 11/28/2022]
Abstract
Clinical evidence indicates that cognitive impairment is a common comorbidity of chronic pain, including neuropathic pain, but the mechanism underlying cognitive impairment remains unclear. Neuroinflammation plays a critical role in the development of both neuropathic pain and cognitive impairment. High-mobility group box 1 (HMGB1) is a proinflammatory molecule and could be involved in neuroinflammation-mediated cognitive impairment in the neuropathic pain state. Hippocampal microglial activation in mice has been associated with cognitive impairment. Thus, the current study examined a potential role of HMGB1 and microglial activation in cognitive impairment in mice with neuropathic pain due to a partial sciatic nerve ligation (PSNL). Mice developed cognitive impairment over two weeks, but not one week, after nerve injury. Nerve-injured mice demonstrated decreased nuclear fraction HMGB1, suggesting increased extracellular release of HMGB1. Furthermore, two weeks after PSNL, significant microglia activation was observed in hippocampus. Inhibition of microglial activation with minocycline, local hippocampal microglia depletion with clodronate liposome, or blockade of HMGB1 with either glycyrrhizic acid (GZA) or anti-HMGB1 antibody in PSNL mice reduced hippocampal microglia activation and ameliorated cognitive impairment. Other changes in the hippocampus of PSNL mice potentially related to cognitive impairment, including decreased hippocampal neuron dendrite length and spine densities and decreased α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) glutamate receptor (AMPAR) subunits, were prevented with anti-HMGB1 antibody treatment. The current findings suggest that neuro-inflammation involves a number of cellular-level changes and microglial activation. Blocking neuro-inflammation, particularly through blocking HMGB1 could be a novel approach to reducing co-morbidities such as cognitive impairment associated with neuropathic pain.
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Affiliation(s)
- Kazue Hisaoka-Nakashima
- Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan
| | - Kazuto Ohata
- Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan
| | - Natsuki Yoshimoto
- Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan
| | - Shintarou Tokuda
- Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan
| | - Nanako Yoshii
- Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan
| | - Yoki Nakamura
- Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan
| | - Dengli Wang
- Department of Pharmacology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Shikata, Okayama, Japan
| | - Keyue Liu
- Department of Pharmacology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Shikata, Okayama, Japan
| | - Hidenori Wake
- Department of Pharmacology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Shikata, Okayama, Japan
| | - Takayuki Yoshida
- Department of Neurophysiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan
| | - Yukio Ago
- Department of Cellular and Molecular Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan
| | - Kouichi Hashimoto
- Department of Neurophysiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan
| | - Masahiro Nishibori
- Department of Translational Research & Drug Development, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Shikata, Okayama, Japan
| | - Norimitsu Morioka
- Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, Japan.
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Zhang MM, Guo MX, Zhang QP, Chen XQ, Li NZ, Liu Q, Cheng J, Wang SL, Xu GH, Li CF, Zhu JX, Yi LT. IL-1R/C3aR signaling regulates synaptic pruning in the prefrontal cortex of depression. Cell Biosci 2022; 12:90. [PMID: 35715851 PMCID: PMC9205119 DOI: 10.1186/s13578-022-00832-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 06/08/2022] [Indexed: 12/25/2022] Open
Abstract
Background Major depressive disorder is characterized by not only monoamine neurotransmitters deficiencies but also persistent neuroinflammation. The complement system is an attractive therapeutic target for various inflammation-related diseases due to its early activation in inflammatory processes. Results In the present study, the dynamic alteration of complement C3 and its receptor C3aR during the occurrence of depression and the mechanism of astrocyte-microglia IL-1R/C3/C3aR on synaptic pruning were investigated. The proteomic analysis firstly showed that chronic stress caused an elevation of C3. GO analysis indicated that complement system-mediated synaptic pruning signaling was involved in depression. The dynamic observation indicated that C3/C3aR was activated in the early onset and throughout the course of depression induced by lipopolysaccharide (LPS) and chronic stress. In contrast, C3aR blockade inhibited the hyperactivation of microglial APT2/DHHC7 palmitoylation cycle, which mediated the translocation of STAT3 and the expression of proinflammatory cytokines. Meanwhile, C3aR blockade also attenuated the synaptic pruning and enhanced the synaptogenesis in the prefrontal cortex of mice. Moreover, the blockade of IL-1R/NF-κB signaling pathway reduced the release of C3 from astrocyte. Conclusions The current study demonstrates that astrocyte-microglia IL-1R/C3/C3aR activation causes the abnormal synaptic pruning in depression, and suggests that the activation of complement C3/C3aR may be particularly helpful in predicting the onset stage of depression. Supplementary Information The online version contains supplementary material available at 10.1186/s13578-022-00832-4.
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Affiliation(s)
- Man-Man Zhang
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China
| | - Min-Xia Guo
- Research Center of Natural Resources of Chinese Medicinal Materials and Ethnic Medicine, Jiangxi University of Chinese Medicine, Nanchang, 330004, Jiangxi province, People's Republic of China
| | - Qiu-Ping Zhang
- Xiamen Hospital of Traditional Chinese Medicine, Xiamen, 361009, Fujian province, People's Republic of China
| | - Xue-Qin Chen
- The First Affiliated Hospital of Xiamen University, Xiamen, 361003, Fujian province, People's Republic of China
| | - Na-Zhi Li
- Research Center of Natural Resources of Chinese Medicinal Materials and Ethnic Medicine, Jiangxi University of Chinese Medicine, Nanchang, 330004, Jiangxi province, People's Republic of China
| | - Qing Liu
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China
| | - Jie Cheng
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China
| | - Shi-Le Wang
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China
| | - Guang-Hui Xu
- Xiamen Medicine Research Institute, Xiamen, 361008, Fujian province, People's Republic of China
| | - Cheng-Fu Li
- Xiamen Hospital of Traditional Chinese Medicine, Xiamen, 361009, Fujian province, People's Republic of China
| | - Ji-Xiao Zhu
- Research Center of Natural Resources of Chinese Medicinal Materials and Ethnic Medicine, Jiangxi University of Chinese Medicine, Nanchang, 330004, Jiangxi province, People's Republic of China.
| | - Li-Tao Yi
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China.
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Wu S, Yin Y, Du L. FUS aggregation following ischemic stroke favors brain astrocyte activation through inducing excessive autophagy. Exp Neurol 2022; 355:114144. [PMID: 35718207 DOI: 10.1016/j.expneurol.2022.114144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 05/25/2022] [Accepted: 06/13/2022] [Indexed: 11/04/2022]
Abstract
As is the case with neurodegenerative diseases, abnormal accumulation of aggregated proteins in neurons and glial are also known to implicate in the pathogenesis of ischemic stroke. However, the potential role of protein aggregates in brain ischemia remains largely unknown. Fused in Sarcoma (FUS) protein has a vital role in RNA metabolism and regulating cellular homeostasis. FUS pathology has been demonstrated in the formation of toxic aggregates and critically affecting cell viability in neurodegenerative diseases including amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD), but whether this also applies to neurological injury following cerebral ischemia is unclear. Herein, we demonstrated a critical role of aggregated FUS in astrocyte activation caused by cerebral ischemia and a possible underlying molecular mechanism. Cerebral ischemic injury significantly induced the formation of cytoplasmic FUS aggregates in reactive astrocytes and injured neurons, thereby aggravating neurofunctional damages and worsening stroke outcomes. Further analysis revealed that extranuclear aggregation of FUS in astrocytes was involved in the induction of excessive autophagy, which contributes to autophagic cell injury or death. In conclusion, our results reveal the important contribution of FUS aggregates in promoting astrocyte activation in stroke pathology independent of its transcriptional regulation activity. We thus propose that aggregation of FUS is an important pathological process in ischemic stroke and targeting FUS aggregates might be of unique therapeutic value in the development of future treatment strategies for ischemic stroke.
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Affiliation(s)
- Shusheng Wu
- Department of Immunology, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Yuye Yin
- Department of Immunology, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Longfei Du
- Department of Laboratory Medicine, Affiliated Hospital of Yangzhou University, Yangzhou, Jiangsu, China.
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TGF-β as a Key Modulator of Astrocyte Reactivity: Disease Relevance and Therapeutic Implications. Biomedicines 2022; 10:biomedicines10051206. [PMID: 35625943 PMCID: PMC9138510 DOI: 10.3390/biomedicines10051206] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 05/12/2022] [Accepted: 05/20/2022] [Indexed: 02/06/2023] Open
Abstract
Astrocytes are essential for normal brain development and functioning. They respond to brain injury and disease through a process referred to as reactive astrogliosis, where the reactivity is highly heterogenous and context-dependent. Reactive astrocytes are active contributors to brain pathology and can exert beneficial, detrimental, or mixed effects following brain insults. Transforming growth factor-β (TGF-β) has been identified as one of the key factors regulating astrocyte reactivity. The genetic and pharmacological manipulation of the TGF-β signaling pathway in animal models of central nervous system (CNS) injury and disease alters pathological and functional outcomes. This review aims to provide recent understanding regarding astrocyte reactivity and TGF-β signaling in brain injury, aging, and neurodegeneration. Further, it explores how TGF-β signaling modulates astrocyte reactivity and function in the context of CNS disease and injury.
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133
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Liu P, Jiang C. Brain-targeting drug delivery systems. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2022; 14:e1818. [PMID: 35596258 DOI: 10.1002/wnan.1818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 05/04/2022] [Accepted: 05/06/2022] [Indexed: 12/11/2022]
Abstract
Brain diseases, including neurodegenerative diseases, acute ischemic stroke and brain tumors, have become a major health problem and a huge burden on society with high morbidity and mortality. However, most of the current therapeutic drugs can only relieve the symptoms of brain diseases, and it is difficult to achieve satisfactory therapeutic effects fundamentally. Extensive studies have shown that the therapeutic effects of brain diseases are mainly affected by two factors: the conservation of the blood-brain barrier (BBB) and the complexity of the brain micro-environment. Brain-targeting drug delivery systems provide new possibilities for overcoming these barriers with versatility. In this review, it provides an overview of BBB alteration and discusses targeting delivery strategies for brain diseases therapy. Furthermore, delivery systems which are designed to modulate the brain micro-environment with synergistic effects were also highlighted. This article is categorized under: Therapeutic Approaches and Drug Discovery > Emerging Technologies.
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Affiliation(s)
- Peixin Liu
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, China
| | - Chen Jiang
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, China
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Songkiatisak P, Rahman SMT, Aqdas M, Sung MH. NF-κB, a culprit of both inflamm-ageing and declining immunity? Immun Ageing 2022; 19:20. [PMID: 35581646 PMCID: PMC9112493 DOI: 10.1186/s12979-022-00277-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 04/29/2022] [Indexed: 04/21/2023]
Abstract
NF-κB is generally recognized as an important regulator of ageing, through its roles in cellular senescence and inflammatory pathways. Activated in virtually all cell-cell communication networks of the immune system, NF-κB is thought to affect age-related defects of both innate and adaptive immune cells, relevant to inflamm-ageing and declining adaptive immunity, respectively. Moreover, the family of NF-κB proteins that exist as heterodimers and homodimers exert their function beyond the immune system. Given their involvement in diverse areas such as DNA damage to metabolism, NF-κB has the potential to serve as linkages between known hallmarks of ageing. However, the complexity of NF-κB dimer composition, dynamic signaling, and tissue-specific actions has received relatively little attention in ageing research. Here, we discuss some areas where further research may bear fruit in our understanding the impact of NF-κB in healthy ageing and longevity.
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Affiliation(s)
- Preeyaporn Songkiatisak
- Laboratory of Molecular Biology and Immunology, National Institute on Aging, National Institutes of Health, 21224, Baltimore, MD, USA
| | - Shah Md Toufiqur Rahman
- Laboratory of Molecular Biology and Immunology, National Institute on Aging, National Institutes of Health, 21224, Baltimore, MD, USA
| | - Mohammad Aqdas
- Laboratory of Molecular Biology and Immunology, National Institute on Aging, National Institutes of Health, 21224, Baltimore, MD, USA
| | - Myong-Hee Sung
- Laboratory of Molecular Biology and Immunology, National Institute on Aging, National Institutes of Health, 21224, Baltimore, MD, USA.
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135
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Roy ER, Chiu G, Li S, Propson NE, Kanchi R, Wang B, Coarfa C, Zheng H, Cao W. Concerted type I interferon signaling in microglia and neural cells promotes memory impairment associated with amyloid β plaques. Immunity 2022; 55:879-894.e6. [PMID: 35443157 PMCID: PMC9109419 DOI: 10.1016/j.immuni.2022.03.018] [Citation(s) in RCA: 51] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 12/02/2021] [Accepted: 03/23/2022] [Indexed: 12/14/2022]
Abstract
The principal signals that drive memory and cognitive impairment in Alzheimer's disease (AD) remain elusive. Here, we revealed brain-wide cellular reactions to type I interferon (IFN-I), an innate immune cytokine aberrantly elicited by amyloid β plaques, and examined their role in cognition and neuropathology relevant to AD in a murine amyloidosis model. Using a fate-mapping reporter system to track cellular responses to IFN-I, we detected robust, Aβ-pathology-dependent IFN-I activation in microglia and other cell types. Long-term blockade of IFN-I receptor (IFNAR) rescued both memory and synaptic deficits and resulted in reduced microgliosis, inflammation, and neuritic pathology. Microglia-specific Ifnar1 deletion attenuated the loss of post-synaptic terminals by selective engulfment, whereas neural Ifnar1 deletion restored pre-synaptic terminals and decreased plaque accumulation. Overall, IFN-I signaling represents a critical module within the neuroinflammatory network of AD and prompts concerted cellular states that are detrimental to memory and cognition.
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Affiliation(s)
- Ethan R Roy
- Huffington Center on Aging, Baylor College of Medicine, Houston, TX 77030, USA
| | - Gabriel Chiu
- Huffington Center on Aging, Baylor College of Medicine, Houston, TX 77030, USA
| | - Sanming Li
- Huffington Center on Aging, Baylor College of Medicine, Houston, TX 77030, USA
| | - Nicholas E Propson
- Huffington Center on Aging, Baylor College of Medicine, Houston, TX 77030, USA
| | - Rupa Kanchi
- Department of Molecular and Cellular Biology and Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Baiping Wang
- Huffington Center on Aging, Baylor College of Medicine, Houston, TX 77030, USA
| | - Cristian Coarfa
- Department of Molecular and Cellular Biology and Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Hui Zheng
- Huffington Center on Aging, Baylor College of Medicine, Houston, TX 77030, USA; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Wei Cao
- Huffington Center on Aging, Baylor College of Medicine, Houston, TX 77030, USA; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA.
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136
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Westacott LJ, Wilkinson LS. Complement Dependent Synaptic Reorganisation During Critical Periods of Brain Development and Risk for Psychiatric Disorder. Front Neurosci 2022; 16:840266. [PMID: 35600620 PMCID: PMC9120629 DOI: 10.3389/fnins.2022.840266] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 03/09/2022] [Indexed: 12/12/2022] Open
Abstract
We now know that the immune system plays a major role in the complex processes underlying brain development throughout the lifespan, carrying out a number of important homeostatic functions under physiological conditions in the absence of pathological inflammation or infection. In particular, complement-mediated synaptic pruning during critical periods of early life may play a key role in shaping brain development and subsequent risk for psychopathology, including neurodevelopmental disorders such as schizophrenia and autism spectrum disorders. However, these disorders vary greatly in their onset, disease course, and prevalence amongst sexes suggesting complex interactions between the immune system, sex and the unique developmental trajectories of circuitries underlying different brain functions which are yet to be fully understood. Perturbations of homeostatic neuroimmune interactions during different critical periods in which regional circuits mature may have a plethora of long-term consequences for psychiatric phenotypes, but at present there is a gap in our understanding of how these mechanisms may impact on the structural and functional changes occurring in the brain at different developmental stages. In this article we will consider the latest developments in the field of complement mediated synaptic pruning where our understanding is beginning to move beyond the visual system where this process was first described, to brain areas and developmental periods of potential relevance to psychiatric disorders.
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Affiliation(s)
- Laura J. Westacott
- Neuroscience and Mental Health Innovation Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Cardiff University, Cardiff, United Kingdom
- Hodge Centre for Neuropsychiatric Immunology, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Lawrence S. Wilkinson
- Neuroscience and Mental Health Innovation Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Cardiff University, Cardiff, United Kingdom
- Hodge Centre for Neuropsychiatric Immunology, School of Medicine, Cardiff University, Cardiff, United Kingdom
- Behavioural Genetics Group, Schools of Psychology and Medicine, Cardiff University, Cardiff, United Kingdom
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137
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Abdi IY, Ghanem SS, El-Agnaf OM. Immune-related biomarkers for Parkinson's disease. Neurobiol Dis 2022; 170:105771. [DOI: 10.1016/j.nbd.2022.105771] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 05/14/2022] [Accepted: 05/15/2022] [Indexed: 12/13/2022] Open
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138
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Lee HG, Wheeler MA, Quintana FJ. Function and therapeutic value of astrocytes in neurological diseases. Nat Rev Drug Discov 2022; 21:339-358. [PMID: 35173313 PMCID: PMC9081171 DOI: 10.1038/s41573-022-00390-x] [Citation(s) in RCA: 128] [Impact Index Per Article: 64.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/05/2022] [Indexed: 12/20/2022]
Abstract
Astrocytes are abundant glial cells in the central nervous system (CNS) that perform diverse functions in health and disease. Astrocyte dysfunction is found in numerous diseases, including multiple sclerosis, Alzheimer disease, Parkinson disease, Huntington disease and neuropsychiatric disorders. Astrocytes regulate glutamate and ion homeostasis, cholesterol and sphingolipid metabolism and respond to environmental factors, all of which have been implicated in neurological diseases. Astrocytes also exhibit significant heterogeneity, driven by developmental programmes and stimulus-specific cellular responses controlled by CNS location, cell-cell interactions and other mechanisms. In this Review, we highlight general mechanisms of astrocyte regulation and their potential as therapeutic targets, including drugs that alter astrocyte metabolism, and therapies that target transporters and receptors on astrocytes. Emerging ideas, such as engineered probiotics and glia-to-neuron conversion therapies, are also discussed. We further propose a concise nomenclature for astrocyte subsets that we use to highlight the roles of astrocytes and specific subsets in neurological diseases.
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Affiliation(s)
- Hong-Gyun Lee
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Michael A Wheeler
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Francisco J Quintana
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
- Broad Institute of MIT and Harvard, Cambridge, MA, USA.
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139
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Lazic A, Balint V, Stanisavljevic Ninkovic D, Peric M, Stevanovic M. Reactive and Senescent Astroglial Phenotypes as Hallmarks of Brain Pathologies. Int J Mol Sci 2022; 23:ijms23094995. [PMID: 35563385 PMCID: PMC9100382 DOI: 10.3390/ijms23094995] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/23/2022] [Accepted: 04/27/2022] [Indexed: 02/06/2023] Open
Abstract
Astrocytes, as the most abundant glial cells in the central nervous system, are tightly integrated into neural networks and participate in numerous aspects of brain physiology and pathology. They are the main homeostatic cells in the central nervous system, and the loss of astrocyte physiological functions and/or gain of pro-inflammatory functions, due to their reactivation or cellular senescence, can have profound impacts on the surrounding microenvironment with pathological outcomes. Although the importance of astrocytes is generally recognized, and both senescence and reactive astrogliosis have been extensively reviewed independently, there are only a few comparative overviews of these complex processes. In this review, we summarize the latest data regarding astrocyte reactivation and senescence, and outline similarities and differences between these phenotypes from morphological, functional, and molecular points of view. A special focus has been given to neurodegenerative diseases, where these phenotypic alternations of astrocytes are significantly implicated. We also summarize current perspectives regarding new advances in model systems based on astrocytes as well as data pointing to these glial cells as potential therapeutic targets.
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Affiliation(s)
- Andrijana Lazic
- Laboratory for Human Molecular Genetics, Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11042 Belgrade, Serbia; (V.B.); (D.S.N.); (M.P.); (M.S.)
- Correspondence:
| | - Vanda Balint
- Laboratory for Human Molecular Genetics, Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11042 Belgrade, Serbia; (V.B.); (D.S.N.); (M.P.); (M.S.)
| | - Danijela Stanisavljevic Ninkovic
- Laboratory for Human Molecular Genetics, Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11042 Belgrade, Serbia; (V.B.); (D.S.N.); (M.P.); (M.S.)
| | - Mina Peric
- Laboratory for Human Molecular Genetics, Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11042 Belgrade, Serbia; (V.B.); (D.S.N.); (M.P.); (M.S.)
| | - Milena Stevanovic
- Laboratory for Human Molecular Genetics, Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11042 Belgrade, Serbia; (V.B.); (D.S.N.); (M.P.); (M.S.)
- Faculty of Biology, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia
- Serbian Academy of Sciences and Arts, Kneza Mihaila 35, 11001 Belgrade, Serbia
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140
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Vicente-Acosta A, Giménez-Cassina A, Díaz-Nido J, Loria F. The smoothened agonist SAG reduces mitochondrial dysfunction and neurotoxicity of frataxin-deficient astrocytes. J Neuroinflammation 2022; 19:93. [PMID: 35413853 PMCID: PMC9006607 DOI: 10.1186/s12974-022-02442-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 03/24/2022] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Friedreich's ataxia is a rare hereditary neurodegenerative disease caused by decreased levels of the mitochondrial protein frataxin. Similar to other neurodegenerative pathologies, previous studies suggested that astrocytes might contribute to the progression of the disease. To fully understand the mechanisms underlying neurodegeneration in Friedreich's ataxia, we investigated the reactivity status and functioning of cultured human astrocytes after frataxin depletion using an RNA interference-based approach and tested the effect of pharmacologically modulating the SHH pathway as a novel neuroprotective strategy. RESULTS We observed loss of cell viability, mitochondrial alterations, increased autophagy and lipid accumulation in cultured astrocytes upon frataxin depletion. Besides, frataxin-deficient cells show higher expression of several A1-reactivity markers and release of pro-inflammatory cytokines. Interestingly, most of these defects were prevented by chronically treating the cells with the smoothened agonist SAG. Furthermore, in vitro culture of neurons with conditioned medium from frataxin-deficient astrocytes results in a reduction of neuronal survival, neurite length and synapse formation. However, when frataxin-deficient astrocytes were chronically treated with SAG, we did not observe these alterations in neurons. CONCLUSIONS Our results demonstrate that the pharmacological activation of the SHH pathway could be used as a target to modulate astrocyte reactivity and neuron-glia interactions to prevent neurodegeneration in Friedreich's ataxia.
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Affiliation(s)
- Andrés Vicente-Acosta
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Nicolás Cabrera 1, 28049 Madrid, Spain
- Departamento de Biología Molecular, Universidad Autónoma de Madrid, Francisco Tomás y Valiente, 7, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
- Instituto de Investigación Sanitaria Puerta de Hierro, Segovia de Arana, Hospital Universitario Puerta de Hierro, Joaquín Rodrigo 1, Majadahonda, 28222 Madrid, Spain
- Program in Molecular Biosciences, Doctoral School, Universidad Autónoma de Madrid, Madrid, Spain
| | - Alfredo Giménez-Cassina
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Nicolás Cabrera 1, 28049 Madrid, Spain
- Departamento de Biología Molecular, Universidad Autónoma de Madrid, Francisco Tomás y Valiente, 7, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
| | - Javier Díaz-Nido
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Nicolás Cabrera 1, 28049 Madrid, Spain
- Departamento de Biología Molecular, Universidad Autónoma de Madrid, Francisco Tomás y Valiente, 7, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
- Instituto de Investigación Sanitaria Puerta de Hierro, Segovia de Arana, Hospital Universitario Puerta de Hierro, Joaquín Rodrigo 1, Majadahonda, 28222 Madrid, Spain
| | - Frida Loria
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Nicolás Cabrera 1, 28049 Madrid, Spain
- Departamento de Biología Molecular, Universidad Autónoma de Madrid, Francisco Tomás y Valiente, 7, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
- Laboratorio de Apoyo a la Investigación, Hospital Universitario Fundación Alcorcón, Budapest 1, Alcorcón, 28922 Madrid, Spain
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141
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Pang QM, Chen SY, Xu QJ, Zhang M, Liang DF, Fu SP, Yu J, Liu ZL, Zhang Q, Zhang T. Effects of astrocytes and microglia on neuroinflammation after spinal cord injury and related immunomodulatory strategies. Int Immunopharmacol 2022; 108:108754. [PMID: 35397392 DOI: 10.1016/j.intimp.2022.108754] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 03/14/2022] [Accepted: 03/31/2022] [Indexed: 12/12/2022]
Abstract
Spinal cord injury (SCI) is a catastrophic event which is still without adequate therapies. Neuroinflammation is the main pathogenesis of secondary damage post-SCI, leading to tissue loss and neurological dysfunction. Previous studies have shown that microglia and astrocytes are the major immune cells in the central nervous system (CNS) and play a crucial role in modulating neuroinflammatory responses. In this study, we mainly review the effects of neuroinflammation in SCI, focusing on the contributions of microglia and astrocytes and their cross-talk. Furthermore, we will also discuss therapeutic strategies on how to regulate their immunophenotype to suppress robust inflammation and facilitate injury prognosis.
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Affiliation(s)
- Qi-Ming Pang
- Key Laboratory of Cell Engineering of Guizhou Province, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China; Department of Orthopedics, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China
| | - Si-Yu Chen
- Key Laboratory of Cell Engineering of Guizhou Province, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China
| | - Qi-Jing Xu
- Department of Human Anatomy, Zunyi Medical University, Zunyi, Guizhou, China
| | - Meng Zhang
- Key Laboratory of Cell Engineering of Guizhou Province, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China
| | - Da-Fei Liang
- Department of Human Anatomy, Zunyi Medical University, Zunyi, Guizhou, China
| | - Sheng-Ping Fu
- Key Laboratory of Cell Engineering of Guizhou Province, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China; Department of Orthopedics, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China
| | - Jiang Yu
- Key Laboratory of Cell Engineering of Guizhou Province, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China
| | - Zu-Lin Liu
- Key Laboratory of Cell Engineering of Guizhou Province, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China
| | - Qian Zhang
- Department of Human Anatomy, Zunyi Medical University, Zunyi, Guizhou, China.
| | - Tao Zhang
- Key Laboratory of Cell Engineering of Guizhou Province, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China; Department of Orthopedics, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China.
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142
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Effects of electroacupuncture combined with hydrogel on the formation and changes in the glial scar in rats with spinal cord injury. JOURNAL OF TRADITIONAL CHINESE MEDICAL SCIENCES 2022. [DOI: 10.1016/j.jtcms.2022.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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143
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Mou W, Ma L, Zhu A, Cui H, Huang Y. Astrocyte-microglia interaction through C3/C3aR pathway modulates neuropathic pain in rats model of chronic constriction injury. Mol Pain 2022; 18:17448069221140532. [PMID: 36341694 PMCID: PMC9669679 DOI: 10.1177/17448069221140532] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 09/24/2022] [Accepted: 11/03/2022] [Indexed: 12/30/2023] Open
Abstract
Neuropathic pain (NP) is the cardinal symptom of neural injury, and its underlying molecular mechanism needs further investigation. Complements, especially complement 3 (C3), are involved in the pathophysiology of many neurological disorders, while the specific role of C3 in NP is still obscure. In this study, we found that both C3 and its receptor C3aR were upregulated in the spinal dorsal horn in a rat chronic constriction injury (CCI) model. In addition, C3 was mainly detected in astrocytes, while C3aR was expressed in microglia and neuron. Intrathecal injection of C3 antibody and C3aR antagonist alleviated NP in CCI model together with reduced M1 polarization of microglia. Our finding suggested that blockade of the C3/C3aR pathway might be a novel strategy for NP.
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Affiliation(s)
- Wanying Mou
- Department of Anesthesiology,
Peking Union Medical College, Chinese Academy of Medical Sciences, Peking Union Medical College
Hospital, Beijing, China
| | - Lulu Ma
- Department of Anesthesiology,
Peking Union Medical College, Chinese Academy of Medical Sciences, Peking Union Medical College
Hospital, Beijing, China
| | - Afang Zhu
- Department of Anesthesiology,
Peking Union Medical College, Chinese Academy of Medical Sciences, Peking Union Medical College
Hospital, Beijing, China
| | - Huan Cui
- Department of Human Anatomy,
Histology and Embryology, Neuroscience Center, Institute of Basic Medical
Sciences, School of Basic Medicine, Chinese Academy of Medical Sciences, Peking Union Medical
College, Beijing, China
| | - Yuguang Huang
- Department of Anesthesiology,
Peking Union Medical College, Chinese Academy of Medical Sciences, Peking Union Medical College
Hospital, Beijing, China
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144
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Xiang J, Meng X, Zhao Y, Wu FX, Li M. HyMM: hybrid method for disease-gene prediction by integrating multiscale module structure. Brief Bioinform 2022; 23:6547263. [PMID: 35275996 DOI: 10.1093/bib/bbac072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 01/18/2022] [Accepted: 02/13/2022] [Indexed: 11/12/2022] Open
Abstract
MOTIVATION Identifying disease-related genes is an important issue in computational biology. Module structure widely exists in biomolecule networks, and complex diseases are usually thought to be caused by perturbations of local neighborhoods in the networks, which can provide useful insights for the study of disease-related genes. However, the mining and effective utilization of the module structure is still challenging in such issues as a disease gene prediction. RESULTS We propose a hybrid disease-gene prediction method integrating multiscale module structure (HyMM), which can utilize multiscale information from local to global structure to more effectively predict disease-related genes. HyMM extracts module partitions from local to global scales by multiscale modularity optimization with exponential sampling, and estimates the disease relatedness of genes in partitions by the abundance of disease-related genes within modules. Then, a probabilistic model for integration of gene rankings is designed in order to integrate multiple predictions derived from multiscale module partitions and network propagation, and a parameter estimation strategy based on functional information is proposed to further enhance HyMM's predictive power. By a series of experiments, we reveal the importance of module partitions at different scales, and verify the stable and good performance of HyMM compared with eight other state-of-the-arts and its further performance improvement derived from the parameter estimation. CONCLUSIONS The results confirm that HyMM is an effective framework for integrating multiscale module structure to enhance the ability to predict disease-related genes, which may provide useful insights for the study of the multiscale module structure and its application in such issues as a disease-gene prediction.
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Affiliation(s)
- Ju Xiang
- Hunan Provincial Key Lab on Bioinformatics, School of Computer Science and Engineering, Central South University, Changsha 410083, China; Department of Basic Medical Sciences & Academician Workstation, Changsha Medical University, Changsha, Hunan 410219, China
| | - Xiangmao Meng
- School of Computer Science and Engineering, Central South University, Changsha 410083, China
| | - Yichao Zhao
- School of Computer Science and Engineering, Central South University, Changsha, Hunan 410083, China
| | - Fang-Xiang Wu
- Division of Biomedical Engineering and Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, S7N 5A9, Canada
| | - Min Li
- Hunan Provincial Key Lab on Bioinformatics, School of Computer Science and Engineering, Central South University, Changsha 410083, China
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145
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Molecular regulation of neuroinflammation in glaucoma: Current knowledge and the ongoing search for new treatment targets. Prog Retin Eye Res 2022; 87:100998. [PMID: 34348167 PMCID: PMC8803988 DOI: 10.1016/j.preteyeres.2021.100998] [Citation(s) in RCA: 47] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 07/23/2021] [Accepted: 07/26/2021] [Indexed: 12/11/2022]
Abstract
Neuroinflammation relying on the inflammatory responses of glial cells has emerged as an impactful component of the multifactorial etiology of neurodegeneration in glaucoma. It has become increasingly evident that despite early adaptive and reparative features of glial responses, prolonged reactivity of the resident glia, along with the peripheral immune cells, create widespread toxicity to retinal ganglion cell (RGC) axons, somas, and synapses. As much as the synchronized responses of astrocytes and microglia to glaucoma-related stress or neuron injury, their bi-directional interactions are critical to build and amplify neuroinflammation and to dictate the neurodegenerative outcome. Although distinct molecular programs regulate somatic and axonal degeneration in glaucoma, inhibition of neurodegenerative inflammation can provide a broadly beneficial treatment strategy to rescue RGC integrity and function. Since inflammatory toxicity and mitochondrial dysfunction are converging etiological paths that can boost each other and feed into a vicious cycle, anti-inflammatory treatments may also offer a multi-target potential. This review presents an overview of the current knowledge on neuroinflammation in glaucoma with particular emphasis on the cell-intrinsic and cell-extrinsic factors involved in the reciprocal regulation of glial responses, the interdependence between inflammatory and mitochondrial routes of neurodegeneration, and the research aspects inspiring for prospective immunomodulatory treatments. With the advent of powerful technologies, ongoing research on molecular and functional characteristics of glial responses is expected to accumulate more comprehensive and complementary information and to rapidly move the field forward to safe and effective modulation of the glial pro-inflammatory activities, while restoring or augmenting the glial immune-regulatory and neurosupport functions.
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146
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Jiwaji Z, Hardingham GE. Good, bad, and neglectful: Astrocyte changes in neurodegenerative disease. Free Radic Biol Med 2022; 182:93-99. [PMID: 35202786 PMCID: PMC8969603 DOI: 10.1016/j.freeradbiomed.2022.02.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/11/2022] [Accepted: 02/18/2022] [Indexed: 12/17/2022]
Abstract
Astrocytes play key roles in CNS development as well as well as neuro-supportive roles in the mature brain including ionic, bioenergetic and redox homeostasis. Astrocytes undergo rapid changes following acute CNS insults such as stroke or traumatic brain injury, but are also profoundly altered in chronic neurodegenerative conditions such as Alzheimer's disease. While disease-altered astrocytes are often referred to as reactive, this does not represent a single cellular state or group of states, but a shift in astrocyte properties that is determined by the type of insult as well as spatio-temporal factors. Such changes can accelerate disease progression due to astrocytes neglecting their normal homeostatic neuro-supportive roles, as well as by gaining active neuro-toxic properties. However, other aspects of astrocytic responses to chronic disease can include the induction of adaptive-protective pathways. This is particularly the case when considering antioxidant defences, which can be up-regulated in many cell types, including astrocytes, in response to stresses, sometimes in concert with the activation of detoxification and proteostasis pathways. Protective responses, whilst potentially serving to mitigate neuronal dysfunction, may ultimately fail due to being insufficiently strong, or be offset by other deleterious changes to astrocytes occurring in parallel. Nevertheless, a greater understanding of early adaptive-protective responses of astrocytes to neurodegenerative disease pathology may point to ways in which these responses may be harnessed for therapeutic effect.
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Affiliation(s)
- Zoeb Jiwaji
- UK Dementia Research Institute at the University of Edinburgh, Chancellor's Building, Edinburgh Medical School, EH16 4SB, UK; Centre for Discovery Brain Sciences, University of Edinburgh, Hugh Robson Building, George Square, Edinburgh, EH8 9XD, UK
| | - Giles E Hardingham
- UK Dementia Research Institute at the University of Edinburgh, Chancellor's Building, Edinburgh Medical School, EH16 4SB, UK; Centre for Discovery Brain Sciences, University of Edinburgh, Hugh Robson Building, George Square, Edinburgh, EH8 9XD, UK.
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147
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Reicher L, Dabaja H, Ginsberg Y, Khatib N, Fouks Y, Attali E, Ross MG, Weiner Z, Beloosesky R. Fetal Neuroprotective Mechanism of Maternal Magnesium Sulfate: Proteomic Analysis. J Mol Neurosci 2022; 72:626-632. [PMID: 34761370 DOI: 10.1007/s12031-021-01939-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 10/27/2021] [Indexed: 10/19/2022]
Abstract
Mg supplementation has been shown to protect preterm fetuses from white and gray matter damage, but the mechanism is unclear. The purpose of this study was to study the effect of maternal inflammation on the overall protein panel of the fetal rat brain, as well as the neuroprotective effect of magnesium-sulfate (MG). Pregnant rats at e20 (n = 6, 18 total) received injections of i.p. lipopolysaccharide (LPS) 500 ug/kg or control saline (SAL) at time 0. Dams were randomized to treatment with s.c. MG (270 mg/kg loading followed by 27 mg/kg q20 min) or saline (SAL) from -2 to +2 h, followed by an additional injection of MG (270 mg/kg) at +2 h. At 4 h after LPS administration, fetal brains were collected from the 3 treatment groups (LPS/SAL, LPS/MG, SAL/SAL) and analyzed by proteomic technique. LPS significantly decreased fetal brain complement C3, alpha-1-antiproteinase, metallothionein-3, alpha-2-macroglobulin, neurosecretory protein VGF, glutathione S-transferase mu 2, fam91a1, cnot7, mitogen-activated protein kinase levels, and significantly increased fetal brain Hbg1, while MG treatment normalized these measures to normal values. Maternal inflammation may cause brain injury via pathways other than the activation of neurotoxic cytokines; this effect could be due to increased/decreased production of certain proteins associated with securing oligodendrocytes, encouraging neuronal growth in the brain, or protecting against cerebral ischemia. MG's neuroprotective activity may be achieved by modifying the effect of LPS on proteins involved in early brain development.
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Affiliation(s)
- Lee Reicher
- (affiliated with Sackler Faculty of Medicine), Lis Maternity and Women's Hospital, Tel Aviv Sourasky Medical Center, Tel Aviv University, 6 Weizman Street, 6423906, Tel Aviv, Israel.
| | - Hanin Dabaja
- Department of Obstetrics and Gynecology, Rambam Health Care Campus, Haifa, Israel
- Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Yuval Ginsberg
- Department of Obstetrics and Gynecology, Rambam Health Care Campus, Haifa, Israel
- Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Nizar Khatib
- Department of Obstetrics and Gynecology, Rambam Health Care Campus, Haifa, Israel
- Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Yuval Fouks
- (affiliated with Sackler Faculty of Medicine), Lis Maternity and Women's Hospital, Tel Aviv Sourasky Medical Center, Tel Aviv University, 6 Weizman Street, 6423906, Tel Aviv, Israel
| | - Emmanuel Attali
- (affiliated with Sackler Faculty of Medicine), Lis Maternity and Women's Hospital, Tel Aviv Sourasky Medical Center, Tel Aviv University, 6 Weizman Street, 6423906, Tel Aviv, Israel
| | - Michael G Ross
- Department of Obstetrics and Gynecology, UCLA Medical Center, Biomedical Research Institute at Harbor-UCLA, Harbor, Los AngelesLos Angeles, CA, USA
- David Geffen School of Medicine at UCLA, Torrance, CA, 90502, USA
| | - Zeev Weiner
- Department of Obstetrics and Gynecology, Rambam Health Care Campus, Haifa, Israel
- Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Ron Beloosesky
- Department of Obstetrics and Gynecology, Rambam Health Care Campus, Haifa, Israel
- Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
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148
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The role of glial cells in multiple sclerosis disease progression. Nat Rev Neurol 2022; 18:237-248. [PMID: 35190704 DOI: 10.1038/s41582-022-00624-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/26/2022] [Indexed: 12/13/2022]
Abstract
Despite the development of highly effective treatments for relapsing-remitting multiple sclerosis (MS), limited progress has been made in addressing primary progressive or secondary progressive MS, both of which lead to loss of oligodendrocytes and neurons and axons, and to irreversible accumulation of disability. Neuroinflammation is central to all forms of MS. The current effective therapies for relapsing-remitting MS target the peripheral immune system; these treatments, however, have repeatedly failed in progressive MS. Greater understanding of inflammation driven by CNS-resident cells - including astrocytes and microglia - is, therefore, required to identify novel potential therapeutic opportunities. Advances in imaging, biomarker analysis and genomics suggest that microglia and astrocytes have central roles in the progressive disease process. In this Review, we provide an overview of the involvement of astrocytes and microglia at major sites of pathology in progressive MS. We discuss current and future therapeutic approaches to directly target glial cells, either to inhibit pathogenic functions or to restore homeostatic functions lost during the course of the disease. We also discuss how bidirectional communication between astrocytes and microglia needs to be considered, as therapeutic targeting of one is likely to alter the functions of the other.
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149
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The Complement System in the Central Nervous System: From Neurodevelopment to Neurodegeneration. Biomolecules 2022; 12:biom12020337. [PMID: 35204837 PMCID: PMC8869249 DOI: 10.3390/biom12020337] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/31/2022] [Accepted: 02/13/2022] [Indexed: 12/13/2022] Open
Abstract
The functions of the complement system to both innate and adaptive immunity through opsonization, cell lysis, and inflammatory activities are well known. In contrast, the role of complement in the central nervous system (CNS) which extends beyond immunity, is only beginning to be recognized as important to neurodevelopment and neurodegeneration. In addition to protecting the brain against invasive pathogens, appropriate activation of the complement system is pivotal to the maintenance of normal brain function. Moreover, overactivation or dysregulation may cause synaptic dysfunction and promote excessive pro-inflammatory responses. Recent studies have provided insights into the various responses of complement components in different neurological diseases and the regulatory mechanisms involved in their pathophysiology, as well as a glimpse into targeting complement factors as a potential therapeutic modality. However, there remain significant knowledge gaps in the relationship between the complement system and different brain disorders. This review summarizes recent key findings regarding the role of different components of the complement system in health and pathology of the CNS and discusses the therapeutic potential of anti-complement strategies for the treatment of neurodegenerative conditions.
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150
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Mann CN, Devi SS, Kersting CT, Bleem AV, Karch CM, Holtzman DM, Gallardo G. Astrocytic α2-Na +/K + ATPase inhibition suppresses astrocyte reactivity and reduces neurodegeneration in a tauopathy mouse model. Sci Transl Med 2022; 14:eabm4107. [PMID: 35171651 DOI: 10.1126/scitranslmed.abm4107] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Alzheimer's disease (AD) is the most dominant form of dementia characterized by the deposition of extracellular amyloid plaques and intracellular neurofibrillary tau tangles (NFTs). In addition to these pathologies, an emerging pathophysiological mechanism that influences AD is neuroinflammation. Astrocytes are a vital type of glial cell that contribute to neuroinflammation, and reactive astrocytes, or astrogliosis, are a well-known pathological feature of AD. However, the mechanisms by which astrocytes contribute to the neurodegenerative process in AD have not been fully elucidated. Here, we showed that astrocytic α2-Na+/K+ adenosine triphosphatase (α2-NKA) is elevated in postmortem human brain tissue from AD and progressive nuclear palsy, a primary tauopathy. The increased astrocytic α2-NKA was also recapitulated in a mouse model of tauopathy. Pharmacological inhibition of α2-NKA robustly suppressed neuroinflammation and reduced brain atrophy. In addition, α2-NKA knockdown in tauopathy mice halted the accumulation of tau pathology. We also demonstrated that α2-NKA promoted tauopathy, in part, by regulating the proinflammatory protein lipocalin-2 (Lcn2). Overexpression of Lcn2 in tauopathy mice increased tau pathology, and prolonged Lcn2 exposure to primary neurons promoted tau uptake in vitro. These studies collectively highlight the contribution of reactive astrocytes to tau pathogenesis in mice and define α2-NKA as a major regulator of astrocytic-dependent neuroinflammation.
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Affiliation(s)
- Carolyn N Mann
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA.,Hope Center for Neurological Disorders, Washington University, St. Louis, MO 63110, USA
| | - Shamulailatpam Shreedarshanee Devi
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA.,Hope Center for Neurological Disorders, Washington University, St. Louis, MO 63110, USA
| | - Corey T Kersting
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA.,Hope Center for Neurological Disorders, Washington University, St. Louis, MO 63110, USA
| | - Amber V Bleem
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA.,Hope Center for Neurological Disorders, Washington University, St. Louis, MO 63110, USA
| | - Celeste M Karch
- Hope Center for Neurological Disorders, Washington University, St. Louis, MO 63110, USA.,Department of Psychiatry, Washington University in St. Louis School of Medicine, St. Louis, MO 63110, USA.,Charles F. and Joanne Knight Alzheimer's Disease Research Center, Washington University, St. Louis, MO 63110, USA
| | - David M Holtzman
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA.,Hope Center for Neurological Disorders, Washington University, St. Louis, MO 63110, USA.,Charles F. and Joanne Knight Alzheimer's Disease Research Center, Washington University, St. Louis, MO 63110, USA
| | - Gilbert Gallardo
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA.,Hope Center for Neurological Disorders, Washington University, St. Louis, MO 63110, USA
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