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Flores-Aguilar L, Hall H, Orciani C, Foret MK, Kovecses O, Ducatenzeiler A, Cuello AC. Early loss of locus coeruleus innervation promotes cognitive and neuropathological changes before amyloid plaque deposition in a transgenic rat model of Alzheimer's disease. Neuropathol Appl Neurobiol 2022; 48:e12835. [PMID: 35822518 DOI: 10.1111/nan.12835] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 05/31/2022] [Accepted: 07/06/2022] [Indexed: 11/29/2022]
Abstract
AIMS The locus coeruleus (LC) is the main source of noradrenaline (NA) in the mammalian brain and has been found to degenerate during the initial stages of Alzheimer's disease (AD). Recent studies indicate that at late stages of the amyloid pathology, LC-pathological alterations accelerate AD-like pathology progression by interfering with the neuromodulatory and anti-inflammatory properties of NA. However, the impact of LC degeneration at the earliest stages of amyloidosis on the AD-like pathology is not well understood. METHODS The LC was lesioned in wild-type (wt) and McGill-R-Thy1-APP transgenic rats (APP tg) by administering N-(2-chloroethyl)-N-ethyl-bromo-benzylamine (DSP4) before amyloid plaque deposition. Cognitive deficits and AD-like neuropathological changes were measured after the LC lesion. RESULTS Four months post-treatment, rats displayed a decrease in brain noradrenergic innervation. The LC lesion in APP tg-treated rats enhanced cognitive deficits and decreased hippocampal cholinergic innervation and neurotrophin expression. In addition, the APP tg-treated rats displayed an increased microglial and astroglial cell number in close vicinity to hippocampal amyloid-beta burdened neurons. The recruited microglia showed cellular alterations indicative of an intermediate activation state. CONCLUSIONS Our results indicate that early LC demise aggravates the early neuroinflammatory process, cognitive impairments, cholinergic deficits and neurotrophin deregulation at the earliest stages of the human-like brain amyloidosis.
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Affiliation(s)
- Lisi Flores-Aguilar
- Department of Anatomy and Cell Biology, McGill University, Montreal, Canada.,Current affiliation: Department of Pathology and Laboratory Medicine, University of California, Irvine, United States of America
| | - Hélène Hall
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | - Chiara Orciani
- Department of Neurology and Neurosurgery, McGill University, Montreal, Canada
| | - Morgan K Foret
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | - Olivia Kovecses
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | | | - A Claudio Cuello
- Department of Anatomy and Cell Biology, McGill University, Montreal, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Canada.,Visiting Professor, Department of Pharmacology, University of Oxford, Oxford, United Kingdom
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2
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Pentz R, Iulita MF, Ducatenzeiler A, Bennett DA, Cuello AC. The human brain NGF metabolic pathway is impaired in the pre-clinical and clinical continuum of Alzheimers disease. Mol Psychiatry 2021; 26:6023-6037. [PMID: 32488129 DOI: 10.1038/s41380-020-0797-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 05/12/2020] [Accepted: 05/19/2020] [Indexed: 12/20/2022]
Abstract
The NGF metabolic pathway entails the proteins that mature pro-nerve growth factor (proNGF) to NGF and those that degrade NGF. Basal forebrain cholinergic neurons require NGF for maintenance of cholinergic phenotype, are critical for cognition, and degenerate early in Alzheimer's disease (AD). In AD, NGF metabolism is altered, but it is not known whether this is an early phenomenon, nor how it relates to AD pathology and symptomology. We acquired dorsolateral/medial prefrontal cortex samples from individuals with Alzheimer's dementia, Mild Cognitive Impairment (MCI), or no cognitive impairment with high (HA-NCI) and low (LA-NCI) brain Aβ from the Religious Orders Study. Cortical proNGF protein, but not mRNA, was higher in AD, MCI, and HA-NCI, while mature NGF was lower. Plasminogen protein was higher in MCI and AD brain tissue, with plasminogen mRNA not likewise elevated, suggesting diminished activation of the proNGF convertase, plasmin. The plasminogen activator tPA was lower in HA-NCI while neuroserpin, the CNS tPA inhibitor, was higher in AD and MCI cortical samples. Matrix metalloproteinase 9 (MMP9), which degrades NGF, was overactive in MCI and AD. Transcription of the MMP9 inhibitor TIMP1 was lower in HA-NCI. ProNGF levels correlated with plasminogen, neuroserpin, and VAChT while NGF correlated with MMP9 activity. In NCI, proNGF correlated with cerebral Aβ and tau deposition and to cognitive performance. In summary, proNGF maturation is impaired in preclinical and clinical AD while mature NGF degradation is enhanced. These differences correlate with cognition, pathology, and cholinergic tone, and may suggest novel biomarkers and therapeutic targets.
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Affiliation(s)
- Rowan Pentz
- Department of Neurology and Neurosurgery, McGill University, Montreal, Québec, Canada
| | - M Florencia Iulita
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Québec, Canada
| | - Adriana Ducatenzeiler
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Québec, Canada
| | - David A Bennett
- Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, Illinois, USA
| | - A Claudio Cuello
- Department of Neurology and Neurosurgery, McGill University, Montreal, Québec, Canada. .,Department of Pharmacology and Therapeutics, McGill University, Montreal, Québec, Canada. .,Department of Anatomy and Cell Biology, McGill University, Montreal, Québec, Canada. .,Department of Pharmacology, Oxford University, Oxford, United Kingdom.
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3
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Pentz R, Iulita MF, Ducatenzeiler A, Videla L, Benejam B, Carmona‐Iragui M, Blesa R, Lleó A, Fortea J, Cuello AC. Nerve growth factor (NGF) pathway biomarkers in Down syndrome prior to and after the onset of clinical Alzheimer's disease: A paired CSF and plasma study. Alzheimers Dement 2021; 17:605-617. [PMID: 33226181 PMCID: PMC8043977 DOI: 10.1002/alz.12229] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 07/28/2020] [Accepted: 10/05/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND The discovery that nerve growth factor (NGF) metabolism is altered in Down syndrome (DS) and Alzheimer's disease (AD) brains offered a framework for the identification of novel biomarkers signalling NGF deregulation in AD pathology. METHODS We examined levels of NGF pathway proteins (proNGF, neuroserpin, tissue plasminogen activator [tPA], and metalloproteases [MMP]) in matched cerebrospinal fluid (CSF)/plasma samples from AD-symptomatic (DSAD) and AD-asymptomatic (aDS) individuals with DS, as well as controls (HC). RESULTS ProNGF and MMP-3 were elevated while tPA was decreased in plasma from individuals with DS. CSF from individuals with DS showed elevated proNGF, neuroserpin, MMP-3, and MMP-9. ProNGF and MMP-9 in CSF differentiated DSAD from aDS (area under the curve = 0.86, 0.87). NGF pathway markers associated with CSF amyloid beta and tau and differed by sex. DISCUSSION Brain NGF metabolism changes can be monitored in plasma and CSF, supporting relevance in AD pathology. These markers could assist staging, subtyping, or precision medicine for AD in DS.
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Affiliation(s)
- Rowan Pentz
- Department of Neurology and NeurosurgeryMcGill UniversityMontrealCanada
| | - M. Florencia Iulita
- Department of Pharmacology and TherapeuticsMcGill UniversityMontrealCanada
- Sant Pau Memory UnitDepartment of NeurologyHospital de la Santa Creu i Sant PauBiomedical Research Institute Sant PauUniversitat Autònoma de BarcelonaBarcelonaSpain
- Center of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED)MadridSpain
| | | | - Laura Videla
- Sant Pau Memory UnitDepartment of NeurologyHospital de la Santa Creu i Sant PauBiomedical Research Institute Sant PauUniversitat Autònoma de BarcelonaBarcelonaSpain
- Center of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED)MadridSpain
- Barcelona Down Medical CenterFundación Catalana Síndrome de DownBarcelonaSpain
| | - Bessy Benejam
- Sant Pau Memory UnitDepartment of NeurologyHospital de la Santa Creu i Sant PauBiomedical Research Institute Sant PauUniversitat Autònoma de BarcelonaBarcelonaSpain
- Center of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED)MadridSpain
- Barcelona Down Medical CenterFundación Catalana Síndrome de DownBarcelonaSpain
| | - María Carmona‐Iragui
- Sant Pau Memory UnitDepartment of NeurologyHospital de la Santa Creu i Sant PauBiomedical Research Institute Sant PauUniversitat Autònoma de BarcelonaBarcelonaSpain
- Center of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED)MadridSpain
- Barcelona Down Medical CenterFundación Catalana Síndrome de DownBarcelonaSpain
| | - Rafael Blesa
- Sant Pau Memory UnitDepartment of NeurologyHospital de la Santa Creu i Sant PauBiomedical Research Institute Sant PauUniversitat Autònoma de BarcelonaBarcelonaSpain
- Center of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED)MadridSpain
| | - Alberto Lleó
- Sant Pau Memory UnitDepartment of NeurologyHospital de la Santa Creu i Sant PauBiomedical Research Institute Sant PauUniversitat Autònoma de BarcelonaBarcelonaSpain
- Center of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED)MadridSpain
| | - Juan Fortea
- Sant Pau Memory UnitDepartment of NeurologyHospital de la Santa Creu i Sant PauBiomedical Research Institute Sant PauUniversitat Autònoma de BarcelonaBarcelonaSpain
- Center of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED)MadridSpain
- Barcelona Down Medical CenterFundación Catalana Síndrome de DownBarcelonaSpain
| | - A. Claudio Cuello
- Department of Neurology and NeurosurgeryMcGill UniversityMontrealCanada
- Department of Pharmacology and TherapeuticsMcGill UniversityMontrealCanada
- Department of Anatomy and Cell BiologyMcGill UniversityMontrealCanada
- Department of PharmacologyOxford UniversityOxfordUK
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4
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Pentz R, Iulita MF, Mikutra-Cencora M, Ducatenzeiler A, Bennett DA, Cuello AC. A new role for matrix metalloproteinase-3 in the NGF metabolic pathway: Proteolysis of mature NGF and sex-specific differences in the continuum of Alzheimer's pathology. Neurobiol Dis 2021; 148:105150. [PMID: 33130223 PMCID: PMC7856186 DOI: 10.1016/j.nbd.2020.105150] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 10/20/2020] [Accepted: 10/23/2020] [Indexed: 12/12/2022] Open
Abstract
Matrix metalloproteinase-3 (MMP-3) has been associated with risk of Alzheimer's disease (AD). In this study we introduce a novel role for MMP-3 in degrading nerve growth factor (NGF) in vivo and examine its mRNA and protein expression across the continuum of AD pathology. We provide evidence that MMP-3 participates in the degradation of mature NGF in vitro and in vivo and that it is secreted from the rat cerebral cortex in an activity-dependent manner. We show that cortical MMP-3 is upregulated in the McGill-R-Thy1-APP transgenic rat model of AD-like amyloidosis. A similar upregulation was found in AD and MCI brains as well as in cognitively normal individuals with elevated amyloid deposition. We also observed that frontal cortex MMP-3 protein levels are higher in males. MMP-3 protein correlated with more AD neuropathology, markers of NGF metabolism, and lower cognitive scores in males but not in females. These results suggest that MMP-3 upregulation in AD might contribute to NGF dysmetabolism, and therefore to cholinergic atrophy and cognitive deficits, in a sex-specific manner. MMP-3 should be further investigated as a biomarker candidate or as a therapeutic target in AD.
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Affiliation(s)
- Rowan Pentz
- Department of Neurology and Neurosurgery, McGill University, Montreal, Canada.
| | - M Florencia Iulita
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada; Sant Pau Memory Unit, Department of Neurology, Hospital de la Santa Creu i Sant Pau, Biomedical Research Institute Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain.
| | - Maya Mikutra-Cencora
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada.
| | | | - David A Bennett
- Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, IL, USA.
| | - A Claudio Cuello
- Department of Neurology and Neurosurgery, McGill University, Montreal, Canada; Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada; Department of Anatomy and Cell Biology, McGill University, Montreal, Canada.
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5
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Wilson EN, Do Carmo S, Welikovitch LA, Hall H, Aguilar LF, Foret MK, Iulita MF, Jia DT, Marks AR, Allard S, Emmerson JT, Ducatenzeiler A, Cuello AC. NP03, a Microdose Lithium Formulation, Blunts Early Amyloid Post-Plaque Neuropathology in McGill-R-Thy1-APP Alzheimer-Like Transgenic Rats. J Alzheimers Dis 2020; 73:723-739. [PMID: 31868669 DOI: 10.3233/jad-190862] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Epidemiological, preclinical, and clinical studies have suggested a role for microdose lithium in reducing Alzheimer's disease (AD) risk by modulating key mechanisms associated with AD pathology. The novel microdose lithium formulation, NP03, has disease-modifying effects in the McGill-R-Thy1-APP transgenic rat model of AD-like amyloidosis at pre-plaque stages, before frank amyloid-β (Aβ) plaque deposition, during which Aβ is primarily intraneuronal. Here, we are interested in determining whether the positive effects of microdose lithium extend into early Aβ post-plaque stages. We administered NP03 (40μg Li/kg; 1 ml/kg body weight) to McGill-R-Thy1-APP transgenic rats for 12 weeks spanning the transition phase from plaque-free to plaque-bearing. The effect of NP03 on remote working memory was assessed using the novel object recognition task. Levels of human Aβ38, Aβ40, and Aβ42 as well as levels of pro-inflammatory mediators were measured in brain-extracts and plasma using electrochemiluminescent assays. Mature Aβ plaques were visualized with a thioflavin-S staining. Vesicular acetylcholine transporter (VAChT) bouton density and levels of chemokine (C-X-C motif) ligand 1 (CXCL1), interleukin-6 (IL-6), and 4-hydroxynonenal (4-HNE) were probed using quantitative immunohistochemistry. During the early Aβ post-plaque stage, we find that NP03 rescues functional deficits in object recognition, reduces loss of cholinergic boutons in the hippocampus, reduces levels of soluble and insoluble cortical Aβ42 and reduces hippocampal Aβ plaque number. In addition, NP03 reduces markers of neuroinflammation and cellular oxidative stress. Together these results indicate that microdose lithium NP03 is effective at later stages of amyloid pathology, after appearance of Aβ plaques.
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Affiliation(s)
- Edward N Wilson
- Neurology and Neurosurgery, McGill University, Montreal Neurological Institute, Montreal, QC, Canada
| | - Sonia Do Carmo
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - Hélène Hall
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - Morgan K Foret
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - Dan Tong Jia
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Adam R Marks
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Simon Allard
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Joshua T Emmerson
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - A Claudio Cuello
- Neurology and Neurosurgery, McGill University, Montreal Neurological Institute, Montreal, QC, Canada.,Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada.,Anatomy and Cell Biology, McGill University, Montreal, QC, Canada.,Department of Pharmacology, University of Oxford, Oxford, United Kingdom (Visiting Professorship)
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6
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Iulita MF, Ganesh A, Pentz R, Flores Aguilar L, Gubert P, Ducatenzeiler A, Christie S, Wilcock GK, Cuello AC. Identification and Preliminary Validation of a Plasma Profile Associated with Cognitive Decline in Dementia and At-Risk Individuals: A Retrospective Cohort Analysis. J Alzheimers Dis 2020; 67:327-341. [PMID: 30636741 DOI: 10.3233/jad-180970] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Biomarker discovery is a major need for earlier dementia diagnosis. We evaluated a plasma signature of amyloid, metallo-proteinases (MMPs), and inflammatory markers in a cohort of at-risk individuals and individuals clinically diagnosed with probable Alzheimer's disease (pAD). Using multiplex arrays, we measured Aβ40, Aβ42, MMP-1, MMP-3, MMP-9, IFN-γ, TNF-α, IL-6, IL-8, and IL-10 in plasma from 107 individuals followed every 6 months for 3 years. Final diagnoses included: pAD (n = 28), mild cognitive impairment (MCI, n = 30), subjective memory impairment (SMI, n = 30), and asymptomatic (NCI, n = 19). Blood was drawn at final follow-up. We used linear and logistic regressions to examine biomarker associations with prior known decline on the Montreal Cognitive Assessment (MoCA) and the Cambridge Cognitive Examination (CAMCOG); as well disease progression by the time of blood-draw. We derived a biomarker composite from the individual markers, and tested its association with a clinical diagnosis of pAD. Lower Aβ40 and Aβ42 and higher IL-8, IL-10, and TNF-α were associated with greater cognitive decline per the MoCA and CAMCOG. MMP-3 was higher in SMI, MCI, and pAD than NCI. Whereas the other investigative molecules did not differ between groups, composite scores-created using MoCA/CAMCOG-based trends in Aβ40, Aβ42, MMP-1, MMP-3, IL-8, IL-10, and TNF-α- were associated with a final diagnosis of pAD (c-statistic 0.732 versus 0.602 for age-sex alone). Thus, plasma amyloid, MMP, and inflammatory biomarkers demonstrated differences in individuals with cognitive deterioration and/or progression to MCI/pAD. Our findings support studying these markers earlier in the continuum of probable AD as well as in specific dementias.
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Affiliation(s)
- M Florencia Iulita
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | - Aravind Ganesh
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK.,Department of Clinical Neurosciences, University of Calgary, Calgary, Canada
| | - Rowan Pentz
- Department of Neurology and Neurosurgery, McGill University, Montreal, Canada
| | | | - Palma Gubert
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | | | - Sharon Christie
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - Gordon K Wilcock
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - A Claudio Cuello
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Canada.,Department of Anatomy and Cell Biology, McGill University, Montreal, Canada.,Department of Pharmacology, University of Oxford, Oxford, United Kingdom (Visiting Professorship)
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7
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Hall H, Iulita MF, Gubert P, Flores Aguilar L, Ducatenzeiler A, Fisher A, Cuello AC. AF710B, an M1/sigma-1 receptor agonist with long-lasting disease-modifying properties in a transgenic rat model of Alzheimer's disease. Alzheimers Dement 2018; 14:811-823. [PMID: 29291374 DOI: 10.1016/j.jalz.2017.11.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 11/16/2017] [Accepted: 11/28/2017] [Indexed: 10/18/2022]
Abstract
INTRODUCTION AF710B (aka ANAVEX 3-71) is a novel selective allosteric M1 muscarinic and sigma-1 receptor agonist. In 3×Tg-AD mice, AF710B attenuates cognitive deficits and decreases Alzheimer-like hallmarks. We now report on the long-lasting disease-modifying properties of AF710B in McGill-R-Thy1-APP transgenic (Tg) rats. METHODS Chronic treatment with AF710B (10 μg/kg) was initiated in postplaque 13-month-old Tg rats. Drug or vehicle was administered orally daily for 4.5 months and interrupted 5 weeks before behavioral testing. RESULTS AF710B long-term treatment reverted the cognitive deficits associated with advanced Alzheimer-like amyloid neuropathology in Tg rats. These effects were accompanied by reductions in amyloid pathology and markers of neuroinflammation and increases in amyloid cerebrospinal fluid clearance and levels of a synaptic marker. Importantly, these effects were maintained following a 5-week interruption of the treatment. DISCUSSION With M1/sigma-1 activity and long-lasting disease-modifying properties at low dose, AF710B is a promising novel therapeutic agent for treating Alzheimer's disease.
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Affiliation(s)
- Hélène Hall
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | | | - Palma Gubert
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | | | | | - Abraham Fisher
- Department of Medicinal Chemistry, Israel Institute for Biological Research, Ness Ziona, Israel(§)
| | - Augusto Claudio Cuello
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada; Department of Anatomy and Cell Biology, McGill University, Montreal, Canada; Department of Neurology and Neurosurgery, McGill University, Montreal, Canada.
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8
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Wilson EN, Abela AR, Do Carmo S, Allard S, Marks AR, Welikovitch LA, Ducatenzeiler A, Chudasama Y, Cuello AC. Intraneuronal Amyloid Beta Accumulation Disrupts Hippocampal CRTC1-Dependent Gene Expression and Cognitive Function in a Rat Model of Alzheimer Disease. ACTA ACUST UNITED AC 2018; 27:1501-1511. [PMID: 26759481 DOI: 10.1093/cercor/bhv332] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
In Alzheimer disease (AD), the accumulation of amyloid beta (Aβ) begins decades before cognitive symptoms and progresses from intraneuronal material to extracellular plaques. To date, however, the precise mechanism by which the early buildup of Aβ peptides leads to cognitive dysfunction remains unknown. Here, we investigate the impact of the early Aβ accumulation on temporal and frontal lobe dysfunction. We compared the performance of McGill-R-Thy1-APP transgenic AD rats with wild-type littermate controls on a visual discrimination task using a touchscreen operant platform. Subsequently, we conducted studies to establish the biochemical and molecular basis for the behavioral alterations. It was found that the presence of intraneuronal Aβ caused a severe associative learning deficit in the AD rats. This coincided with reduced nuclear translocation and genomic occupancy of the CREB co-activator, CRTC1, and decreased production of synaptic plasticity-associated transcripts Arc, c-fos, Egr1, and Bdnf. Thus, blockade of CRTC1-dependent gene expression in the early, preplaque phase of AD-like pathology provides a molecular basis for the cognitive deficits that figure so prominently in early AD.
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Affiliation(s)
- Edward N Wilson
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QCCanadaH3G 1Y6
| | - Andrew R Abela
- Department of Psychology, McGill University, Montreal, QCCanadaH3A 1B1
| | - Sonia Do Carmo
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QCCanadaH3G 1Y6
| | - Simon Allard
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QCCanadaH3G 1Y6
| | - Adam R Marks
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QCCanadaH3G 1Y6
| | - Lindsay A Welikovitch
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QCCanadaH3G 1Y6
| | - Adriana Ducatenzeiler
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QCCanadaH3G 1Y6
| | - Yogita Chudasama
- Department of Psychology, McGill University, Montreal, QC Canada H3A 1B1.,Current address: National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, USA
| | - A Claudio Cuello
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC Canada H3G 1Y6.,Department of Anatomy and Cell Biology.,Department of Neurology and Neurosurgery, McGill University, Montreal, QC Canada
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Carmo SD, Jacobs ML, Lax EM, Hall H, Ritson J, Iulita MF, Yang J, Yu L, Ducatenzeiler A, Bennett DA, Szyf M, Cuello AC. [P4–035]: AMYLOID β‐DRIVEN DNA DEMETHYLATION AS A TARGET FOR ALZHEIMER's DISEASE. Alzheimers Dement 2017. [DOI: 10.1016/j.jalz.2017.06.1899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | | | | | - Lei Yu
- Rush University Medical CenterChicagoILUSA
- Rush Alzheimer's Disease CenterChicagoILUSA
| | | | - David A. Bennett
- Rush University Medical CenterChicagoILUSA
- Rush Alzheimer's Disease CenterChicagoILUSA
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10
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Do Carmo S, Crynen G, Paradis T, Reed J, Iulita MF, Ducatenzeiler A, Crawford F, Cuello AC. Hippocampal Proteomic Analysis Reveals Distinct Pathway Deregulation Profiles at Early and Late Stages in a Rat Model of Alzheimer's-Like Amyloid Pathology. Mol Neurobiol 2017; 55:3451-3476. [PMID: 28502044 DOI: 10.1007/s12035-017-0580-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Accepted: 04/26/2017] [Indexed: 01/01/2023]
Abstract
The cerebral accumulation and cytotoxicity of amyloid beta (Aβ) is central to Alzheimer's pathogenesis. However, little is known about how the amyloid pathology affects the global expression of brain proteins at different disease stages. In order to identify genotype and time-dependent significant changes in protein expression, we employed quantitative proteomics analysis of hippocampal tissue from the McGill-R-Thy1-APP rat model of Alzheimer-like amyloid pathology. McGill transgenic rats were compared to wild-type rats at early and late pathology stages, i.e., when intraneuronal Aβ amyloid burden is conspicuous and when extracellular amyloid plaques are abundant with more pronounced cognitive deficits. After correction for multiple testing, the expression levels of 64 proteins were found to be considerably different in transgenic versus wild-type rats at the pre-plaque stage (3 months), and 86 proteins in the post-plaque group (12 months), with only 9 differentially regulated proteins common to the 2 time-points. This minimal overlap supports the hypothesis that different molecular pathways are affected in the hippocampus at early and late stages of the amyloid pathology throughout its continuum. At early stages, disturbances in pathways related to cellular responses to stress, protein homeostasis, and neuronal structure are predominant, while disturbances in metabolic energy generation dominate at later stages. These results shed new light on the molecular pathways affected by the early accumulation of Aβ and how the evolving amyloid pathology impacts other complex metabolic pathways.
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Affiliation(s)
- Sonia Do Carmo
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - Tiffany Paradis
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Jon Reed
- Roskamp Institute, Sarasota, FL, USA
| | - M Florencia Iulita
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Adriana Ducatenzeiler
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - A Claudio Cuello
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada. .,Department of Anatomy and Cell Biology, McGill University, Montreal, QC, Canada. .,Department of Neurology and Neurosurgery, McGill University, Montreal, QC, Canada.
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Wilson EN, Carmo SD, Iulita MF, Allard S, Marks AR, Windheim J, Ducatenzeiler A, Cuello AC. P3‐046: NP03 Inhibits Bace1 and GSK‐3B for the Prevention of Early Alzheimer’s‐Like Amyloid Neuropathology in Transgenic Rats. Alzheimers Dement 2016. [DOI: 10.1016/j.jalz.2016.06.1704] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Sonia Do Carmo
- Department of Pharmacology - McGill University MontrealQC Canada
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Hall H, Iulita MF, Ducatenzeiler A, Fisher A, Cuello AC. P4‐013: Pro‐Cognitive and Anti‐Inflammatory Effects of Af710B, a Mixed M1 Muscarinic/Sigma‐1 Receptor Agonist, in the Mcgill‐R‐Thy1‐App Rat Model of Human Ad‐Like Amyloid Pathology. Alzheimers Dement 2016. [DOI: 10.1016/j.jalz.2016.06.2102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | | | | | - Abraham Fisher
- Israel Institute for Biological ResearchNess ZionaIsrael
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Hanzel CE, Pichet-Binette A, Pimentel LS, Iulita MF, Allard S, Ducatenzeiler A, Do Carmo S, Cuello AC. Neuronal driven pre-plaque inflammation in a transgenic rat model of Alzheimer's disease. Neurobiol Aging 2014; 35:2249-62. [DOI: 10.1016/j.neurobiolaging.2014.03.026] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 03/03/2014] [Accepted: 03/24/2014] [Indexed: 12/30/2022]
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Iulita MF, Allard S, Richter L, Munter LM, Ducatenzeiler A, Weise C, Do Carmo S, Klein WL, Multhaup G, Cuello AC. Intracellular Aβ pathology and early cognitive impairments in a transgenic rat overexpressing human amyloid precursor protein: a multidimensional study. Acta Neuropathol Commun 2014; 2:61. [PMID: 24903713 PMCID: PMC4229908 DOI: 10.1186/2051-5960-2-61] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 05/07/2014] [Indexed: 01/09/2023] Open
Abstract
Numerous studies have implicated the abnormal accumulation of intraneuronal amyloid-β (Aβ) as an important contributor to Alzheimer’s disease (AD) pathology, capable of triggering neuroinflammation, tau hyperphosphorylation and cognitive deficits. However, the occurrence and pathological relevance of intracellular Aβ remain a matter of controversial debate. In this study, we have used a multidimensional approach including high-magnification and super-resolution microscopy, cerebro-spinal fluid (CSF) mass spectrometry analysis and ELISA to investigate the Aβ pathology and its associated cognitive impairments, in a novel transgenic rat model overexpressing human APP. Our microscopy studies with quantitative co-localization analysis revealed the presence of intraneuronal Aβ in transgenic rats, with an immunological signal that was clearly distinguished from that of the amyloid precursor protein (APP) and its C-terminal fragments (CTFs). The early intraneuronal pathology was accompanied by a significant elevation of soluble Aβ42 peptides that paralleled the presence and progression of early cognitive deficits, several months prior to amyloid plaque deposition. Aβ38, Aβ39, Aβ40 and Aβ42 peptides were detected in the rat CSF by MALDI-MS analysis even at the plaque-free stages; suggesting that a combination of intracellular and soluble extracellular Aβ may be responsible for impairing cognition at early time points. Taken together, our results demonstrate that the intraneuronal development of AD-like amyloid pathology includes a mixture of molecular species (Aβ, APP and CTFs) of which a considerable component is Aβ; and that the early presence of these species within neurons has deleterious effects in the CNS, even before the development of full-blown AD-like pathology.
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Ferretti MT, Bruno MA, Ducatenzeiler A, Klein WL, Cuello AC. Intracellular Aβ-oligomers and early inflammation in a model of Alzheimer's disease. Neurobiol Aging 2012; 33:1329-42. [DOI: 10.1016/j.neurobiolaging.2011.01.007] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 01/21/2011] [Accepted: 01/26/2011] [Indexed: 12/21/2022]
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Ferretti MT, Allard S, Partridge V, Ducatenzeiler A, Cuello AC. Minocycline corrects early, pre-plaque neuroinflammation and inhibits BACE-1 in a transgenic model of Alzheimer's disease-like amyloid pathology. J Neuroinflammation 2012; 9:62. [PMID: 22472085 PMCID: PMC3352127 DOI: 10.1186/1742-2094-9-62] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Accepted: 04/02/2012] [Indexed: 12/20/2022] Open
Abstract
Background A growing body of evidence indicates that inflammation is one of the earliest neuropathological events in Alzheimer's disease. Accordingly, we have recently shown the occurrence of an early, pro-inflammatory reaction in the hippocampus of young, three-month-old transgenic McGill-Thy1-APP mice in the absence of amyloid plaques but associated with intracellular accumulation of amyloid beta petide oligomers. The role of such a pro-inflammatory process in the progression of the pathology remained to be elucidated. Methods and results To clarify this we administered minocycline, a tetracyclic derivative with anti-inflammatory and neuroprotective properties, to young, pre-plaque McGill-Thy1-APP mice for one month. The treatment ended at the age of three months, when the mice were still devoid of plaques. Minocycline treatment corrected the up-regulation of inducible nitric oxide synthase and cyclooxygenase-2 observed in young transgenic placebo mice. Furthermore, the down-regulation of inflammatory markers correlated with a reduction in amyloid precursor protein levels and amyloid precursor protein-related products. Beta-site amyloid precursor protein cleaving enzyme 1 activity and levels were found to be up-regulated in transgenic placebo mice, while minocycline treatment restored these levels to normality. The anti-inflammatory and beta-secretase 1 effects could be partly explained by the inhibition of the nuclear factor kappa B pathway. Conclusions Our study suggests that the pharmacological modulation of neuroinflammation might represent a promising approach for preventing or delaying the development of Alzheimer's disease neuropathology at its initial, pre-clinical stages. The results open new vistas to the interplay between inflammation and amyloid pathology.
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Affiliation(s)
- Maria Teresa Ferretti
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Montreal, QC H3G 1Y6, Canada
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Ferretti MT, Partridge V, Leon WC, Canneva F, Allard S, Arvanitis DN, Vercauteren F, Houle D, Ducatenzeiler A, Klein WL, Glabe CG, Szyf M, Cuello AC. Transgenic mice as a model of pre-clinical Alzheimer's disease. Curr Alzheimer Res 2011; 8:4-23. [PMID: 21143159 DOI: 10.2174/156720511794604561] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Accepted: 07/07/2010] [Indexed: 11/22/2022]
Abstract
At diagnosis, Alzheimer's disease (AD) brains are extensively burdened with plaques and tangles and display a degree of synaptic failure most likely beyond therapeutic treatment. It is therefore crucial to identify early pathological events in the progression of the disease. While it is not currently feasible to identify and study early, pre-clinical stages of AD, transgenic (Tg) models offer a valuable tool in this regard. Here we investigated cognitive, structural and biochemical CNS alterations occurring in our newly developed McGill-Thyl-APP Tg mice (over-expressing the human amyloid precursor protein with the Swedish and Indiana mutations) prior to extracellular plaque deposition. Pre-plaque, 3-month old Tg mice already displayed cognitive deficits concomitant with reorganization of cortical cholinergic pre-synaptic terminals. Conformational specific antibodies revealed the early appearance of intracellular amyloid β (Aβ)-oligomers and fibrillar oligomers in pyramidal neurons of cerebral cortex and hippocampus. At the same age, the cortical levels of insulin degrading enzyme -a well established Aβ-peptidase, were found to be significantly down-regulated. Our results suggest that, in the McGill-Thy1-APP Tg model, functional, structural and biochemical alterations are already present in the CNS at early, pre-plaque stages of the pathology. Accumulation of intraneuronal neurotoxic Aβ-oligomers (possibly caused by a failure in the clearance machinery) is likely to be the culprit of such early, pre-plaque pathology. Similar neuronal alterations might occur prior to clinical diagnosis in AD, during a yet undefined 'latent' stage. A better understanding of such pre-clinical AD might yield novel therapeutic targets and or diagnostic tools.
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Affiliation(s)
- M T Ferretti
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada.
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Canneva F, Melis T, Leon W, Iulita F, Dobner J, Ducatenzeiler A, Schilling S, Hoersten S, Cuello C. P4‐280: Naive and pyroglutamated amyloid beta accumulation in the McGill‐R‐THY1‐APP rat model of Alzheimer's disease. Alzheimers Dement 2011. [DOI: 10.1016/j.jalz.2011.09.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Crawford F, Crynen G, Reed J, Katz B, Ducatenzeiler A, Mullan M, Cuello C. P3‐008: Proteomic characterization of a novel rat model of Alzheimer's disease. Alzheimers Dement 2011. [DOI: 10.1016/j.jalz.2011.05.1447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Jon Reed
- Roskamp InstituteSarasotaFloridaUnited States
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Leon WC, Canneva F, Partridge V, Allard S, Ferretti MT, DeWilde A, Vercauteren F, Atifeh R, Ducatenzeiler A, Klein W, Szyf M, Alhonen L, Cuello AC. A novel transgenic rat model with a full Alzheimer's-like amyloid pathology displays pre-plaque intracellular amyloid-beta-associated cognitive impairment. J Alzheimers Dis 2010; 20:113-26. [PMID: 20164597 DOI: 10.3233/jad-2010-1349] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Alzheimer's disease (AD) is a neurodegenerative pathology in which amyloid-beta (Abeta) peptide accumulates in different brain areas leading to deposition of plaques and a progressive decline of cognitive functions. After a decade in which a number of transgenic (Tg) mouse models mimicking AD-like amyloid-deposition pathology have been successfully generated, few rat models have been reported that develop intracellular and extracellular Abeta accumulation, together with impairment of cognition. The generation of a Tg rat reproducing the full AD-like amyloid pathology has been elusive. Here we describe the generation and characterization of a new transgenic rat line, coded McGill-R-Thy1-APP, developed to express the human amyloid-beta precursor protein (AbetaPP) carrying both the Swedish and Indiana mutations under the control of the murine Thy1.2 promoter. The selected mono-transgenic line displays an extended phase of intraneuronal Abeta accumulation, already apparent at 1 week after birth, which is widespread throughout different cortical areas and the hippocampus (CA1, CA2, CA3, and dentate gyrus). Homozygous Tg animals eventually produce extracellular Abeta deposits and, by 6 months of age, dense, thioflavine S-positive, amyloid plaques are detected, associated with glial activation and surrounding dystrophic neurites. The cognitive functions in transgenic McGill-R-Thy1-APP rats, as assessed using the Morris water maze task, were found already altered as early as at 3 months of age, when no CNS plaques are yet present. The spatial cognitive impairment becomes more prominent in older animals (13 months), where the behavioral performance of Tg rats positively correlates with the levels of soluble Abeta (trimers) measured in the cortex.
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Affiliation(s)
- Wanda Carolina Leon
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
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Cuello AC, Ferretti MT, Leon WC, Iulita MF, Melis T, Ducatenzeiler A, Bruno MA, Canneva F. Early-stage inflammation and experimental therapy in transgenic models of the Alzheimer-like amyloid pathology. NEURODEGENER DIS 2010; 7:96-8. [PMID: 20173335 DOI: 10.1159/000285514] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Intracellular accumulation of beta-amyloid (Abeta) is one of the early features in the neuropathology of Alzheimer's disease (AD) and Down's syndrome. This can be reproduced in cell and transgenic animal models of the AD-like amyloid pathology. In a transgenic rat model, our lab has previously shown that the intracellular accumulation of Abeta is sufficient to provoke cognitive impairments and biochemical alterations in the cerebral cortex and hippocampus in the absence of amyloid plaques. OBJECTIVE To investigate an early, pre-plaque inflammatory process in AD-like transgenic models and establish whether the neurotoxic effects of Abeta oligomers and proinflammatory responses can be arrested with minocycline. METHODS For these studies, we used naïve mice and transgenic animal models of the AD-like amyloid pathology and applied neurochemical, immunohistochemical and behavioral experimental approaches. RESULTS In the early stages of the AD-like amyloid pathology, intracellular Abeta oligomers accumulate within neurons of the cerebral cortex and hippocampus. Coincidental with this, behavioral impairments occur prior to the appearance of amyloid plaques, together with an upregulation of MHC-II, i-NOS and COX-2, well-known proinflammatory markers. Treatment with minocycline corrected behavioral impairments, lowered inflammatory markers and levels of Abeta trimers. CONCLUSION A pharmacological approach targeting the early neuroinflammatory effects of Abeta might be a promising strategy to prevent or delay the onset of AD.
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Affiliation(s)
- A C Cuello
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Que., Canada.
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Leon WC, Canneva F, Partridge V, Allard S, Ducatenzeiler A, Atifeh R, Alhonen L, Cuello AC. P4‐031: A novel transgenic rat model displaying the full Alzheimer‐like amyloid pathology with early, preplaque‐stage cognitive deficits. Alzheimers Dement 2009. [DOI: 10.1016/j.jalz.2009.04.901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ferretti MT, Bruno M, Partridge V, Arvanitis D, Leon W, Ducatenzeiler A, Glabe C, Klein W, Cuello AC. P1‐086: Intracellular accumulation of Aβ oligomers and inflammatory response precede plaque formation in a new transgenic model of the Alzheimer‐like amyloid pathology. Alzheimers Dement 2008. [DOI: 10.1016/j.jalz.2008.05.672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Canneva F, Leon W, Partridge V, Ducatenzeiler A, Alhonen L, Cuello AC. P1‐064: Human APP overexpression in a transgenic rat model leads to intracellular Aβ accumulation and amyloid plaque deposition. Alzheimers Dement 2008. [DOI: 10.1016/j.jalz.2008.05.650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | - Leena Alhonen
- Virtanen Institute for Molecular SciencesKuopioFinland
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Arvanitis DN, Ducatenzeiler A, Ou JN, Grodstein E, Andrews SD, Tendulkar SR, Ribeiro-da-Silva A, Szyf M, Cuello AC. High intracellular concentrations of amyloid-beta block nuclear translocation of phosphorylated CREB. J Neurochem 2007; 103:216-28. [PMID: 17587310 DOI: 10.1111/j.1471-4159.2007.04704.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The beta-amyloid peptide (Abeta) is considered responsible for the pathogenesis of Alzheimer's disease. Despite the magnitude of reports describing a neurotoxic role of extracellular Abeta, the role for intracellular Abeta (iAbeta) has not been elucidated. We previously demonstrated that in rat pheochromocytoma cells expression of moderate levels of Abeta results in the up-regulation of phospho-extracellular signal-regulated kinases (ERK1)/2 along with an elevation of cyclic AMP-response element (CRE)-regulated gene expression; however, the effect of high intracellular levels of Abeta were not examined. Towards this goal we generated constructs that endogenously produce different expression levels of iAbeta in a human cell line. We show a bimodal response to Abeta in a neural human cell line. A moderate increase of endogenous Abeta up-regulates certain cyclic AMP-response element-binding protein (CREB) responsive genes such as presenilin 1, presenilin 2, brain-derived neurotrophic factor, and mRNA and protein levels by CREB activation and Synapsin 1 nuclear translocation. On the other hand, high-loads of iAbeta resulted in sustained hyper-phosphorylation of CREB that did not translocate to the nucleus and did not stimulate activation of CRE-regulated gene expression. Our study suggests that variations in levels of iAbeta could influence signaling mechanisms that lead to phosphorylation of CREB, its nuclear translocation and CRE-regulated genes involved in production of Abeta and synaptic plasticity in opposite directions.
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Affiliation(s)
- D N Arvanitis
- Department of Pharmacology & Therapeutics, McGill University, Montreal, Quebec, Canada
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Bell KFS, Ducatenzeiler A, Ribeiro-da-Silva A, Duff K, Bennett DA, Cuello AC. The amyloid pathology progresses in a neurotransmitter-specific manner. Neurobiol Aging 2005; 27:1644-57. [PMID: 16271419 DOI: 10.1016/j.neurobiolaging.2005.09.034] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2005] [Revised: 09/16/2005] [Accepted: 09/20/2005] [Indexed: 12/21/2022]
Abstract
Past studies using transgenic models of early-staged amyloid pathology, have suggested that the amyloid pathology progresses in a neurotransmitter-specific manner where cholinergic terminals appear most vulnerable, followed by glutamatergic terminals and finally by somewhat more resistant GABAergic terminals. To determine whether this neurotransmitter-specific progression persists at later pathological stages, presynaptic bouton densities, and the areas of occupation and localization of plaque adjacent dystrophic neurites were quantified in 18-month-old APP(K670N, M671L)+PS1(M146L) doubly transgenic mice. Quantification revealed that transgenic animals had significantly lower cholinergic, glutamatergic and GABAergic presynaptic bouton densities. Cholinergic and glutamatergic dystrophic neurites appear to be heavily influenced by fibrillar Abeta as both types displayed a decreasing area of occupation with respect to increasing plaque size. Furthermore, cholinergic dystrophic neurites reside in closer proximity to plaques than glutamatergic dystrophic neurites, while GABAergic dystrophic neurites were minimal regardless of plaque size. To investigate whether similarities exist in the human AD pathology, a monoclonal antibody (McKA1) against the human vesicular glutamate transporter 1 (VGluT1) was developed. Subsequent staining in AD brain tissue revealed the novel presence of glutamatergic dystrophic neurites, to our knowledge the first evidence of a structural glutamatergic deficit in the AD pathology.
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Affiliation(s)
- Karen F S Bell
- Department of Pharmacology and Therapeutics, McGill University, 3655 Sir William Osler Promenade, Montreal, Que., Canada, H3G 1Y6
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Echeverria V, Ducatenzeiler A, Chen CH, Cuello AC. Endogenous β-amyloid peptide synthesis modulates cAMP response element-regulated gene expression in PC12 cells. Neuroscience 2005; 135:1193-202. [PMID: 16181736 DOI: 10.1016/j.neuroscience.2005.06.057] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2005] [Revised: 06/20/2005] [Accepted: 06/24/2005] [Indexed: 01/01/2023]
Abstract
Extracellular-regulated kinases play a fundamental role in several neuroplasticity processes. In order to test whether endogenous beta-amyloid peptides play a role in the activation of extracellular-regulated kinase, we investigated the Rap1-extracellular-regulated kinase pathway in PC12 cells expressing human beta-amyloid precursor protein containing familial Alzheimer's disease mutations. In PC12 cells transfected with mutant human beta-amyloid precursor proteins that lead to higher levels of endogenous beta-amyloid, we observed an up-regulation of phospho-extracellular-regulated kinase and higher levels of activity-induced cAMP response element-directed gene expression. These results suggest that moderate levels of endogenous beta-amyloid peptides stimulate cAMP response element-directed gene expression. This stimulation was via a Rap1/MEK/extracellular-regulated kinase signaling pathway, as it was blocked by inhibition of Rap1 and MEK activities, and it requires beta-amyloid precursor protein cleavage at the gamma-site as it was abolished by a gamma-secretase inhibitor. Interestingly, in agreement with the previous observations, micromolar levels of extracellular fibrillar beta-amyloid blocked the cAMP response element-regulated gene expression stimulated by potassium and forskolin. This indicates that beta-amyloid can provoke different responses on cAMP response element-directed gene expression, such that low beta-amyloid levels may play a physiological role favoring synaptic plasticity under normal conditions while it would inhibit this mechanism under pathological conditions.
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Affiliation(s)
- V Echeverria
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Montreal, QC, Canada H3G 1Y6.
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Echeverria V, Ducatenzeiler A, Alhonen L, Janne J, Grant SM, Wandosell F, Muro A, Baralle F, Li H, Duff K, Szyf M, Cuello AC. Rat transgenic models with a phenotype of intracellular Abeta accumulation in hippocampus and cortex. J Alzheimers Dis 2004; 6:209-19. [PMID: 15201476 DOI: 10.3233/jad-2004-6301] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In this communication we report the characterization of several transgenic rat lines expressing human AbetaPP carrying the Swedish and Indiana mutations (coded UKUR28), the human presenilin 1 transgene with the 'Finn' mutation (coded UKUR19) and double transgenic rats expressing both transgenes (coded UKUR25). In these Tg rats, the AbetaPP and PS1 transgene expression was largely restricted to the hippocampus and neocortex. The PS1 transgenic rats did not produce visible changes in Abeta immunoreactivity. The AbetaPP transgenic rats (both the single Tg UKUR28, and double Tg UKUR25) generated a phenotype of intra-neuronalbeta accumulation without plaque formation and with no increased immunoreactivity for AbetaPP amino and carboxyl-terminal epitopes. This phenotype was apparent as early as 6 months of age in the transgenic rat lines carrying the human AbetaPP transgene. No senile plaques of aggregated Abeta were observed in any of the transgenic lines generated, up to 24 months of age. The hAbetaPP single homozygous Tg line (UKUR28) showed an increase in ERK2, without changes in glycogen synthase kinase 3 (GSK3) activity. A preliminary protein analysis of the hippocampus of the double transgenic rat (UKUR25) by mass spectrometry showed differences in the protein profile between this transgenic line and controls.
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Cuello AC, Ducatenzeiler A, Echeverria V. S4-01-05 Possible pathological and physiological roles for intracellular Aβ peptides. Neurobiol Aging 2004. [DOI: 10.1016/s0197-4580(04)80229-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Echeverria V, Ducatenzeiler A, Dowd E, Jänne J, Grant SM, Szyf M, Wandosell F, Avila J, Grimm H, Dunnett SB, Hartmann T, Alhonen L, Cuello AC. Altered mitogen-activated protein kinase signaling, tau hyperphosphorylation and mild spatial learning dysfunction in transgenic rats expressing the β-amyloid peptide intracellularly in hippocampal and cortical neurons. Neuroscience 2004; 129:583-92. [PMID: 15541880 DOI: 10.1016/j.neuroscience.2004.07.036] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/13/2004] [Indexed: 11/16/2022]
Abstract
The pathological significance of intracellular Abeta accumulation in vivo is not yet fully understood. To address this, we have studied transgenic rats expressing Alzheimer's-related transgenes that accumulate Abeta intraneuronally in the cerebral and hippocampal cortices but do not develop extracellular amyloid plaques. In these rats, the presence of intraneuronal Abeta is sufficient to provoke up-regulation of the phosphorylated form of extracellular-regulated kinase (ERK) 2 and its enzymatic activity in the hippocampus while no changes were observed in the activity or phosphorylation status of other putative tau kinases such as p38, glycogen synthase kinase 3, and cycline-dependent kinase 5. The increase in active phospho-ERK2 was accompanied by increased levels of tau phosphorylation at S396 and S404 ERK2 sites and a decrease in the phosphorylation of the CREB kinase p90RSK. In a water maze paradigm, male transgenic rats displayed a mild spatial learning deficit relative to control littermates. Our results suggest that in the absence of plaques, intraneuronal accumulation of Abeta peptide correlates with the initial steps in the tau-phosphorylation cascade, alterations in ERK2 signaling and impairment of higher CNS functions in male rats.
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Affiliation(s)
- V Echeverria
- Department of Pharmacology, McGill University, 3655 Promenade Sir-William-Osler, Montreal, Quebec, Canada H3G 1Y6
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Grant SM, Ducatenzeiler A, Szyf M, Cuello AC. Abeta immunoreactive material is present in several intracellular compartments in transfected, neuronally differentiated, P19 cells expressing the human amyloid beta-protein precursor. J Alzheimers Dis 2000; 2:207-22. [PMID: 12214085 DOI: 10.3233/jad-2000-23-403] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Processing of the amyloid beta-protein precursor is believed to play a critical role in the development of Alzheimer's disease neuropathology. The localization of the human Abeta epitope within mature neuroectodermally differentiated embryonal carcinoma (P19) cells, stably transfected with the cDNA coding for a wild form human amyloid beta-protein precursor (AbetaPP 751) was investigated. For this, we applied high resolution electron microscopy and immunocytochemistry with a newly developed, highly specfic monoclonal antibody (McSA1). We observed immunoreactive signals in a number of subcellular organelles such as early endosomes, the trans-Golgi network and in the dilated rough endoplasmic reticulum, but not in lysosomes. Occasionally Abeta immunoreactivity was associated with microtubules and filaments, with the outer mitochondrial membrane, and with the nuclear envelope. These observations expand on current data regarding intracellular trafficking of AbetaPP fragments and provoke further questions regarding the role of intracellular Abeta peptides in basal conditions and pathological states.
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Affiliation(s)
- S M Grant
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Montreal, Quebec, Canada
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