151
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Steffen J, Stenzel J, Ibrahim S, Pahnke J. Short-Term Effects of Microglia-Specific Mitochondrial Dysfunction on Amyloidosis in Transgenic Models of Alzheimer’s Disease. J Alzheimers Dis 2018; 65:465-474. [DOI: 10.3233/jad-180395] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Johannes Steffen
- Department of Neurology, University of Rostock, Neurodegeneration Research Lab (NRL), Germany
- University of Lübeck (UzL), LIED, Lübeck, Germany
| | - Jan Stenzel
- Department of Neurology, University of Rostock, Neurodegeneration Research Lab (NRL), Germany
| | | | - Jens Pahnke
- Department of Neurology, University of Rostock, Neurodegeneration Research Lab (NRL), Germany
- Department of Neuro-/Pathology, University of Oslo (UiO) and Oslo University Hospital (OUS), Oslo, Norway
- University of Lübeck (UzL), LIED, Lübeck, Germany
- Department of Pharmacology, University of Latvia, Rīga, Latvia
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152
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Fainstein N, Dan-Goor N, Ben-Hur T. Resident brain neural precursor cells develop age-dependent loss of therapeutic functions in Alzheimer's mice. Neurobiol Aging 2018; 72:40-52. [PMID: 30205359 DOI: 10.1016/j.neurobiolaging.2018.07.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 06/25/2018] [Accepted: 07/26/2018] [Indexed: 12/27/2022]
Abstract
There is vast knowledge on pathogenic mechanisms in Alzheimer's disease but very little on means by which the brain protects itself from disease. A major candidate in providing neuroprotection is the resident brain neural precursor/stem cell (NPC) pool. Transplanted NPCs possess powerful immune-modulatory and trophic properties in vivo and in vitro, underscoring the question whether resident brain NPCs have any role in regulating disease pathology in Alzheimer's disease, and particularly whether they fail to protect the brain from degeneration. To evaluate brain NPC function in relation to disease pathology, we first characterized the pathological properties of 5xFAD transgenic mouse model of Alzheimer's disease at different ages. We found that age 7 months is a critical time point of heavy amyloid deposition and gliosis but before neurodegeneration and a normal basal rate of NPC turnover in the subventricular zone (SVZ) of 5xFAD mice as compared to wild-type mice. Analysis of NPC functional properties showed that despite preserved rate of turnover, there was substantial SVZ NPC dysfunction as indicated by both ex vivo and in vivo assays. Freshly isolated NPCs from 7-month-old 5xFAD mice exhibited reduced expansion rate and diminished immune-modulatory and trophic properties. Moreover, there was slowed recovery of SVZ NPCs after cytosine-arabinoside insult and markedly reduced migratory response following a lysolecithin-induced lesion in the corpus callosum in vivo. Importantly, these functions were fully preserved in 2-month-old 5xFAD mice, a time point before Alzheimer's disease-specific pathological changes. There was reduced expression of key genes involved in NPC proliferative and migratory response in NPCs derived from 7-month-old 5xFAD mice. The dysfunctional properties and downregulation of gene expression were reversible in NPCs derived from 7-month-old 5xFAD mice following in vitro expansion and were reproduced in wild-type NPC by addition of amyloid beta peptide. Thus, there is age-dependent acquired NPC dysfunction, with loss of immune-modulatory and neurotrophic properties, which is induced by the pathological Alzheimer's brain environment at a critical time point before neurodegeneration. We suggest that failure of resident NPC to provide tissue support may be involved in promoting neurodegeneration.
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Affiliation(s)
- Nina Fainstein
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Nadav Dan-Goor
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Tamir Ben-Hur
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.
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153
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Beggiato S, Borelli AC, Ferraro L, Tanganelli S, Antonelli T, Tomasini MC. Palmitoylethanolamide Blunts Amyloid-β42-Induced Astrocyte Activation and Improves Neuronal Survival in Primary Mouse Cortical Astrocyte-Neuron Co-Cultures. J Alzheimers Dis 2018; 61:389-399. [PMID: 29154284 DOI: 10.3233/jad-170699] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND Based on the pivotal role of astrocytes in brain homeostasis and the strong metabolic cooperation existing between neurons and astrocytes, it has been suggested that astrocytic dysfunctions might cause and/or contribute to neuroinflammation and neurodegenerative processes. Therapeutic approaches aimed at both neuroprotection and neuroinflammation reduction may prove particularly effective in slowing the progression of these diseases. The endogenous lipid mediator palmitoylethanolamide (PEA) displayed neuroprotective and anti(neuro)inflammatory properties, and demonstrated interesting potential as a novel treatment for Alzheimer's disease. OBJECTIVE AND METHODS We firstly evaluated whether astrocytes could participate in regulating the Aβ42-induced neuronal damage, by using primary mouse astrocytes cell cultures and mixed astrocytes-neurons cultures. Furthermore, the possible protective effects of PEA against Aβ42-induced neuronal toxicity have also been investigated by evaluating neuronal viability, apoptosis, and morphometric parameters. RESULTS The presence of astrocytes pre-exposed to Aβ42 (0.5μM; 24 h) induced a reduction of neuronal viability in primary mouse astrocytes-neurons co-cultures. Furthermore, under these experimental conditions, an increase in the number of neuronal apoptotic nuclei and a decrease in the number of MAP-2 positive neurons were observed. Finally, astrocytic Aβ42 pre-exposure induced an increase in the number of neurite aggregations/100μm as compared to control (i.e., untreated) astrocytes-neurons co-cultures. These effects were not observed in neurons cultured in the presence of astrocytes pre-exposed to PEA (0.1μM), applied 1 h before and maintained during Aβ42 treatment. CONCLUSION Astrocytes contribute to Aβ42-induced neurotoxicity and PEA, by blunting Aβ42-induced astrocyte activation, improved neuronal survival in mouse astrocyte-neuron co-cultures.
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Affiliation(s)
- Sarah Beggiato
- Department of Life Sciences and Biotechnology, University of Ferrara, Italy.,IRET Foundation, Ozzano Emilia, Bologna, Italy
| | | | - Luca Ferraro
- Department of Life Sciences and Biotechnology, University of Ferrara, Italy.,IRET Foundation, Ozzano Emilia, Bologna, Italy.,LTTA Centre, University of Ferrara, Italy
| | - Sergio Tanganelli
- IRET Foundation, Ozzano Emilia, Bologna, Italy.,Department of Medical Sciences, University of Ferrara, Italy.,LTTA Centre, University of Ferrara, Italy
| | - Tiziana Antonelli
- IRET Foundation, Ozzano Emilia, Bologna, Italy.,Department of Medical Sciences, University of Ferrara, Italy.,LTTA Centre, University of Ferrara, Italy
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154
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Giannopoulos PF, Praticò D. Overexpression of 5-Lipoxygenase Worsens the Phenotype of a Mouse Model of Tauopathy. Mol Neurobiol 2018; 55:5926-5936. [PMID: 29128902 DOI: 10.1007/s12035-017-0817-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 10/27/2017] [Indexed: 11/24/2022]
Abstract
Brain accumulation of increasing amount of phosphorylated microtubule associated tau protein is one the major hallmark lesions of Alzheimer's disease (AD) and related tauopathies. Consistent evidence from clinical and animal studies has shown that neuroinflammation characterizes these diseases. The 5-lipoxygenase (5LO) is an enzyme protein whose metabolic products are lipids with potent inflammatory actions. Previously, we showed that blockade of 5LO activation ameliorates the phenotype of the htau transgenic mice. Here, by employing a vector system to overexpress 5LO in the brain of the same mouse model, we investigated its role and contribution to their behavioral deficits and development of tau neuropathology. Compared with controls, 5LO gene targeted mice manifested significant impairments in their memory and learning ability. On the other hand, brain tissues of the same mice had higher 5LO protein level and activity which resulted in intense neuroinflammation and synaptic pathology. Further, the same mice had a significant elevation of tau phosphorylation, which associated with the activation of the cdk5 kinase and an accumulation of insoluble tau. The functional involvement of this kinase in the 5LO-dependent tau phosphorylation was confirmed in neuronal cells. Taken together, our findings demonstrate that neuronal 5LO is directly involved in tau phosphorylation and tau neuropathology, and for this reason, it should be considered a good therapeutic target for tauopathies.
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Affiliation(s)
- Phillip F Giannopoulos
- Center for Translational Medicine, Department of Pharmacology, Lewis Katz School of Medicine, Temple University, 3500 North Broad Street, MERB, 947, Philadelphia, PA, 19140, USA
| | - Domenico Praticò
- Center for Translational Medicine, Department of Pharmacology, Lewis Katz School of Medicine, Temple University, 3500 North Broad Street, MERB, 947, Philadelphia, PA, 19140, USA.
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155
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Cao T, Zhou X, Zheng X, Cui Y, Tsien JZ, Li C, Wang H. Histone Deacetylase Inhibitor Alleviates the Neurodegenerative Phenotypes and Histone Dysregulation in Presenilins-Deficient Mice. Front Aging Neurosci 2018; 10:137. [PMID: 29867447 PMCID: PMC5962686 DOI: 10.3389/fnagi.2018.00137] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 04/24/2018] [Indexed: 11/28/2022] Open
Abstract
Histone acetylation has been shown to play a crucial role in memory formation, and histone deacetylase (HDAC) inhibitor sodium butyrate (NaB) has been demonstrated to improve memory performance and rescue the neurodegeneration of several Alzheimer’s Disease (AD) mouse models. The forebrain presenilin-1 and presenilin-2 conditional double knockout (cDKO) mice showed memory impairment, forebrain degeneration, tau hyperphosphorylation and inflammation that closely mimics AD-like phenotypes. In this article, we have investigated the effects of systemic administration of NaB on neurodegenerative phenotypes in cDKO mice. We found that chronic NaB treatment significantly restored contextual memory but did not alter cued memory in cDKO mice while such an effect was not permanent after treatment withdrawal. We further revealed that NaB treatment did not rescue reduced synaptic numbers and cortical shrinkage in cDKO mice, but significantly increased the neurogenesis in subgranular zone of dentate gyrus (DG). We also observed that tau hyperphosphorylation and inflammation related protein glial fibrillary acidic protein (GFAP) level were decreased in cDKO mice by NaB. Furthermore, GO and pathway analysis for the RNA-Seq data demonstrated that NaB treatment induced enrichment of transcripts associated with inflammation/immune processes and cytokine-cytokine receptor interactions. RT-PCR confirmed that NaB treatment inhibited the expression of inflammation related genes such as S100a9 and Ccl4 found upregulated in the brain of cDKO mice. Surprisingly, the level of brain histone acetylation in cDKO mice was dramatically increased and was decreased by the administration of NaB, which may reflect dysregulation of histone acetylation underlying memory impairment in cDKO mice. These results shed some lights on the possible molecular mechanisms of HDAC inhibitor in alleviating the neurodegenerative phenotypes of cDKO mice and provide a promising target for treating AD.
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Affiliation(s)
- Ting Cao
- Shanghai Key Laboratory of Brain Functional Genomics, Key Laboratory of Brain Functional Genomics, Ministry of Education, School of Psychology and Cognitive Science, East China Normal University Shanghai, China
| | - Xiaojuan Zhou
- Shanghai Key Laboratory of Brain Functional Genomics, Key Laboratory of Brain Functional Genomics, Ministry of Education, School of Psychology and Cognitive Science, East China Normal University Shanghai, China
| | - Xianjie Zheng
- Shanghai Key Laboratory of Brain Functional Genomics, Key Laboratory of Brain Functional Genomics, Ministry of Education, School of Psychology and Cognitive Science, East China Normal University Shanghai, China
| | - Yue Cui
- Shanghai Key Laboratory of Brain Functional Genomics, Key Laboratory of Brain Functional Genomics, Ministry of Education, School of Psychology and Cognitive Science, East China Normal University Shanghai, China
| | - Joe Z Tsien
- Brain and Behavior Discovery Institute and Department of Neurology, Medical College of Georgia at Augusta University Augusta, GA, United States
| | - Chunxia Li
- Shanghai Key Laboratory of Brain Functional Genomics, Key Laboratory of Brain Functional Genomics, Ministry of Education, School of Psychology and Cognitive Science, East China Normal University Shanghai, China
| | - Huimin Wang
- Shanghai Key Laboratory of Brain Functional Genomics, Key Laboratory of Brain Functional Genomics, Ministry of Education, School of Psychology and Cognitive Science, East China Normal University Shanghai, China.,NYU-ECNU Institute of Brain and Cognitive Science, New York University Shanghai Shanghai, China.,Shanghai Changning-ECNU Mental Health Center Shanghai, China
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156
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Pacheco SM, Azambuja JH, de Carvalho TR, Soares MSP, Oliveira PS, da Silveira EF, Stefanello FM, Braganhol E, Gutierres JM, Spanevello RM. Glioprotective Effects of Lingonberry Extract Against Altered Cellular Viability, Acetylcholinesterase Activity, and Oxidative Stress in Lipopolysaccharide-Treated Astrocytes. Cell Mol Neurobiol 2018; 38:1107-1121. [PMID: 29556871 DOI: 10.1007/s10571-018-0581-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 03/05/2018] [Indexed: 01/24/2023]
Abstract
Altered astrocytic function is a contributing factor to the development of neurological diseases and neurodegeneration. Berry fruits exert neuroprotective effects by modulating pathways involved in inflammation, neurotransmission, and oxidative stress. The aim of this study was to examine the effects of the lingonberry extract on cellular viability and oxidative stress in astrocytes exposed to lipopolysaccharide (LPS). In the reversal protocol, primary astrocytic cultures were first exposed to 1 µg/mL LPS for 3 h and subsequently treated with lingonberry extract (10, 30, 50, and 100 μg/mL) for 24 and 48 h. In the prevention protocol, exposure to the lingonberry extract was performed before treatment with LPS. In both reversal and prevention protocols, the lingonberry extracts, from 10 to 100 μg/mL, attenuated LPS-induced increase in reactive oxygen species (around 55 and 45%, respectively, P < 0.01), nitrite levels (around 50 and 45%, respectively, P < 0.05), and acetylcholinesterase activity (around 45 and 60%, respectively, P < 0.05) in astrocytic cultures at 24 and 48 h. Also, in both reversal and prevention protocols, the lingonberry extract also prevented and reversed the LPS-induced decreased cellular viability (around 45 and 90%, respectively, P < 0.05), thiol content (around 55 and 70%, respectively, P < 0.05), and superoxide dismutase activity (around 50 and 145%, respectively, P < 0.05), in astrocytes at both 24 and 48 h. Our findings suggested that the lingonberry extract exerted a glioprotective effect through an anti-oxidative mechanism against LPS-induced astrocytic damage.
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Affiliation(s)
- Simone Muniz Pacheco
- Programa de Pós-Graduação em Bioquímica e Bioprospecção, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Caixa Postal 354, Campus Capão do Leão, s/n, Pelotas, 96010-900, RS, Brazil
| | - Juliana Hofstätter Azambuja
- Programa de Pós-Graduação em Biociências, Departamento de Ciências Básicas da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, 90050-170, RS, Brazil
| | - Taíse Rosa de Carvalho
- Programa de Pós-Graduação em Bioquímica e Bioprospecção, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Caixa Postal 354, Campus Capão do Leão, s/n, Pelotas, 96010-900, RS, Brazil
| | - Mayara Sandrielly Pereira Soares
- Programa de Pós-Graduação em Bioquímica e Bioprospecção, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Caixa Postal 354, Campus Capão do Leão, s/n, Pelotas, 96010-900, RS, Brazil
| | - Pathise Souto Oliveira
- Programa de Pós-Graduação em Bioquímica e Bioprospecção, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Caixa Postal 354, Campus Capão do Leão, s/n, Pelotas, 96010-900, RS, Brazil
| | - Elita Ferreira da Silveira
- Programa de Pós-Graduação em Ciências Fisiológicas, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande, CEP 96201-900, RS, Brazil
| | - Francieli Moro Stefanello
- Programa de Pós-Graduação em Bioquímica e Bioprospecção, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Caixa Postal 354, Campus Capão do Leão, s/n, Pelotas, 96010-900, RS, Brazil
| | - Elizandra Braganhol
- Programa de Pós-Graduação em Biociências, Departamento de Ciências Básicas da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, 90050-170, RS, Brazil
| | - Jessié Martins Gutierres
- Programa de Pós-Graduação em Bioquímica e Bioprospecção, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Caixa Postal 354, Campus Capão do Leão, s/n, Pelotas, 96010-900, RS, Brazil
| | - Roselia Maria Spanevello
- Programa de Pós-Graduação em Bioquímica e Bioprospecção, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Caixa Postal 354, Campus Capão do Leão, s/n, Pelotas, 96010-900, RS, Brazil.
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157
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AD-Related N-Terminal Truncated Tau Is Sufficient to Recapitulate In Vivo the Early Perturbations of Human Neuropathology: Implications for Immunotherapy. Mol Neurobiol 2018; 55:8124-8153. [PMID: 29508283 DOI: 10.1007/s12035-018-0974-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 02/19/2018] [Indexed: 01/08/2023]
Abstract
The NH2tau 26-44 aa (i.e., NH2htau) is the minimal biologically active moiety of longer 20-22-kDa NH2-truncated form of human tau-a neurotoxic fragment mapping between 26 and 230 amino acids of full-length protein (htau40)-which is detectable in presynaptic terminals and peripheral CSF from patients suffering from AD and other non-AD neurodegenerative diseases. Nevertheless, whether its exogenous administration in healthy nontransgenic mice is able to elicit a neuropathological phenotype resembling human tauopathies has not been yet investigated. We explored the in vivo effects evoked by subchronic intracerebroventricular (i.c.v.) infusion of NH2htau or its reverse counterpart into two lines of young (2-month-old) wild-type mice (C57BL/6 and B6SJL). Six days after its accumulation into hippocampal parenchyma, significant impairment in memory/learning performance was detected in NH2htau-treated group in association with reduced synaptic connectivity and neuroinflammatory response. Compromised short-term plasticity in paired-pulse facilitation paradigm (PPF) was detected in the CA3/CA1 synapses from NH2htau-impaired animals along with downregulation in calcineurin (CaN)-stimulated pCREB/c-Fos pathway(s). Importantly, these behavioral, synaptotoxic, and neuropathological effects were independent from the genetic background, occurred prior to frank neuronal loss, and were specific because no alterations were detected in the control group infused with its reverse counterpart. Finally, a 2.0-kDa peptide which biochemically and immunologically resembles the injected NH2htau was endogenously detected in vivo, being present in hippocampal synaptosomal preparations from AD subjects. Given that the identification of the neurotoxic tau species is mandatory to develop a more effective tau-based immunological approach, our evidence can have important translational implications for cure of human tauopathies.
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158
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Palmitoylethanolamide Dampens Reactive Astrogliosis and Improves Neuronal Trophic Support in a Triple Transgenic Model of Alzheimer's Disease: In Vitro and In Vivo Evidence. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:4720532. [PMID: 29576849 PMCID: PMC5822864 DOI: 10.1155/2018/4720532] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 10/02/2017] [Accepted: 10/23/2017] [Indexed: 11/18/2022]
Abstract
Alzheimer's disease (AD) is a neurodegenerative disorder responsible for the majority of dementia cases in elderly people. It is widely accepted that the main hallmarks of AD are not only senile plaques and neurofibrillary tangles but also reactive astrogliosis, which often precedes detrimental deposits and neuronal atrophy. Such phenomenon facilitates the regeneration of neural networks; however, under some circumstances, like in AD, reactive astrogliosis is detrimental, depriving neurons of the homeostatic support, thus contributing to neuronal loss. We investigated the presence of reactive astrogliosis in 3×Tg-AD mice and the effects of palmitoylethanolamide (PEA), a well-documented anti-inflammatory molecule, by in vitro and in vivo studies. In vitro results revealed a basal reactive state in primary cortical 3×Tg-AD-derived astrocytes and the ability of PEA to counteract such phenomenon and improve viability of 3×Tg-AD-derived neurons. In vivo observations, performed using ultramicronized- (um-) PEA, a formulation endowed with best bioavailability, confirmed the efficacy of this compound. Moreover, the schedule of treatment, mimicking the clinic use (chronic daily administration), revealed its beneficial pharmacological properties in dampening reactive astrogliosis and promoting the glial neurosupportive function. Collectively, our results encourage further investigation on PEA effects, suggesting it as an alternative or adjunct treatment approach for innovative AD therapy.
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159
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Rodriguez-Vieitez E, Nordberg A. Imaging Neuroinflammation: Quantification of Astrocytosis in a Multitracer PET Approach. Methods Mol Biol 2018; 1750:231-251. [PMID: 29512077 DOI: 10.1007/978-1-4939-7704-8_16] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The recent progress in the development of in vivo biomarkers is rapidly changing how neurodegenerative diseases are conceptualized and diagnosed, and how clinical trials are designed today. Alzheimer's disease (AD)-the most common neurodegenerative disorder-is characterized by a complex neuropathology involving the deposition of extracellular amyloid-β (Aβ) plaques and intracellular neurofibrillary tangles (NFT) of hyperphosphorylated tau proteins, accompanied by the activation of glial cells-astrocytes and microglia-and neuroinflammatory responses, leading to neurodegeneration and cognitive dysfunction. An increasing diversity of positron emission tomography (PET) imaging radiotracers are available to selectively target the different pathophysiological processes of AD. Along with the success of Aβ PET and the more recent tau PET imaging, there is also a great interest to develop PET tracers to image glial activation and neuroinflammation. While most research to date has focused on imaging microgliosis, recent studies using 11C-deuterium-L-deprenyl (11C-DED) PET imaging suggest that astrocytosis may be present from very early stages of disease development in AD. This chapter provides a detailed description of the practical approach used for the analysis of 11C-DED PET imaging data in a multitracer PET paradigm including 11C-Pittsburgh compound B (11C-PiB) and 18F-fluorodeoxyglucose (18F-FDG). The multitracer PET approach allows investigating the comparative regional and temporal patterns of in vivo brain astrocytosis, fibrillar Aβ deposition, and glucose metabolism in patients at different stages of disease progression. This chapter attempts to stimulate further research in the field, including the development of novel PET tracers that may allow visualizing different aspects of the complex astrocytic and microglial responses in neurodegenerative diseases. Progress in the field will contribute to the incorporation of PET imaging of glial activation and neuroinflammation as biomarkers with clinical application, and motivate further investigation on glial cells as therapeutic targets in AD and other neurodegenerative diseases.
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Affiliation(s)
- Elena Rodriguez-Vieitez
- Division of Translational Alzheimer Neurobiology, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden.
| | - Agneta Nordberg
- Division of Translational Alzheimer Neurobiology, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
- Department of Geriatric Medicine, Karolinska University Hospital Huddinge, Stockholm, Sweden
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160
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González-Reyes RE, Nava-Mesa MO, Vargas-Sánchez K, Ariza-Salamanca D, Mora-Muñoz L. Involvement of Astrocytes in Alzheimer's Disease from a Neuroinflammatory and Oxidative Stress Perspective. Front Mol Neurosci 2017; 10:427. [PMID: 29311817 PMCID: PMC5742194 DOI: 10.3389/fnmol.2017.00427] [Citation(s) in RCA: 329] [Impact Index Per Article: 47.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 12/06/2017] [Indexed: 12/19/2022] Open
Abstract
Alzheimer disease (AD) is a frequent and devastating neurodegenerative disease in humans, but still no curative treatment has been developed. Although many explicative theories have been proposed, precise pathophysiological mechanisms are unknown. Due to the importance of astrocytes in brain homeostasis they have become interesting targets for the study of AD. Changes in astrocyte function have been observed in brains from individuals with AD, as well as in AD in vitro and in vivo animal models. The presence of amyloid beta (Aβ) has been shown to disrupt gliotransmission, neurotransmitter uptake, and alter calcium signaling in astrocytes. Furthermore, astrocytes express apolipoprotein E and are involved in the production, degradation and removal of Aβ. As well, changes in astrocytes that precede other pathological characteristics observed in AD, point to an early contribution of astroglia in this disease. Astrocytes participate in the inflammatory/immune responses of the central nervous system. The presence of Aβ activates different cell receptors and intracellular signaling pathways, mainly the advanced glycation end products receptor/nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) pathway, responsible for the transcription of pro-inflammatory cytokines and chemokines in astrocytes. The release of these pro-inflammatory agents may induce cellular damage or even stimulate the production of Aβ in astrocytes. Additionally, Aβ induces the appearance of oxidative stress (OS) and production of reactive oxygen species and reactive nitrogen species in astrocytes, affecting among others, intracellular calcium levels, NADPH oxidase (NOX), NF-κB signaling, glutamate uptake (increasing the risk of excitotoxicity) and mitochondrial function. Excessive neuroinflammation and OS are observed in AD, and astrocytes seem to be involved in both. The Aβ/NF-κB interaction in astrocytes may play a central role in these inflammatory and OS changes present in AD. In this paper, we also discuss therapeutic measures highlighting the importance of astrocytes in AD pathology. Several new therapeutic approaches involving phenols (curcumin), phytoestrogens (genistein), neuroesteroids and other natural phytochemicals have been explored in astrocytes, obtaining some promising results regarding cognitive improvements and attenuation of neuroinflammation. Novel strategies comprising astrocytes and aimed to reduce OS in AD have also been proposed. These include estrogen receptor agonists (pelargonidin), Bambusae concretio Salicea, Monascin, and various antioxidatives such as resveratrol, tocotrienol, anthocyanins, and epicatechin, showing beneficial effects in AD models.
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Affiliation(s)
- Rodrigo E González-Reyes
- Grupo de Investigación en Neurociencias (NeURos), Escuela de Medicina y Ciencias de la Salud, Universidad del Rosario, Bogotá, Colombia
| | - Mauricio O Nava-Mesa
- Grupo de Investigación en Neurociencias (NeURos), Escuela de Medicina y Ciencias de la Salud, Universidad del Rosario, Bogotá, Colombia
| | - Karina Vargas-Sánchez
- Biomedical Sciences Research Group, School of Medicine, Universidad Antonio Nariño, Bogotá, Colombia
| | - Daniel Ariza-Salamanca
- Grupo de Investigación en Neurociencias (NeURos), Escuela de Medicina y Ciencias de la Salud, Universidad del Rosario, Bogotá, Colombia
| | - Laura Mora-Muñoz
- Grupo de Investigación en Neurociencias (NeURos), Escuela de Medicina y Ciencias de la Salud, Universidad del Rosario, Bogotá, Colombia
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161
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Shijo T, Warita H, Suzuki N, Kitajima Y, Ikeda K, Akiyama T, Ono H, Mitsuzawa S, Nishiyama A, Izumi R, Aoki M. Aberrant astrocytic expression of chondroitin sulfate proteoglycan receptors in a rat model of amyotrophic lateral sclerosis. J Neurosci Res 2017; 96:222-233. [DOI: 10.1002/jnr.24127] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 07/07/2017] [Accepted: 07/07/2017] [Indexed: 12/13/2022]
Affiliation(s)
- Tomomi Shijo
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Hitoshi Warita
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Naoki Suzuki
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Yasuo Kitajima
- Medicine and Science in Sports and Exercise; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Kensuke Ikeda
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Tetsuya Akiyama
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Hiroya Ono
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Shio Mitsuzawa
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Ayumi Nishiyama
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Rumiko Izumi
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
| | - Masashi Aoki
- Department of Neurology; Tohoku University Graduate School of Medicine; Sendai Japan
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