1
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Wu J, Quraishi IH, Zhang Y, Bromwich M, Kaczmarek LK. Disease-causing Slack potassium channel mutations produce opposite effects on excitability of excitatory and inhibitory neurons. Cell Rep 2024; 43:113904. [PMID: 38457342 PMCID: PMC11013952 DOI: 10.1016/j.celrep.2024.113904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 12/18/2023] [Accepted: 02/16/2024] [Indexed: 03/10/2024] Open
Abstract
The KCNT1 gene encodes the sodium-activated potassium channel Slack (KCNT1, KNa1.1), a regulator of neuronal excitability. Gain-of-function mutations in humans cause cortical network hyperexcitability, seizures, and severe intellectual disability. Using a mouse model expressing the Slack-R455H mutation, we find that Na+-dependent K+ (KNa) and voltage-dependent sodium (NaV) currents are increased in both excitatory and inhibitory cortical neurons. These increased currents, however, enhance the firing of excitability neurons but suppress that of inhibitory neurons. We further show that the expression of NaV channel subunits, particularly that of NaV1.6, is upregulated and that the length of the axon initial segment and of axonal NaV immunostaining is increased in both neuron types. Our study on the coordinate regulation of KNa currents and the expression of NaV channels may provide an avenue for understanding and treating epilepsies and other neurological disorders.
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Affiliation(s)
- Jing Wu
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Imran H Quraishi
- Department of Neurology, Yale Comprehensive Epilepsy Center, Yale School of Medicine, New Haven, CT 06520, USA
| | - Yalan Zhang
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Mark Bromwich
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Leonard K Kaczmarek
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA; Department of Cellular and Molecular Physiology, Yale School of Medicine, New Haven, CT 06520, USA.
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2
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Hijazi S, Smit AB, van Kesteren RE. Fast-spiking parvalbumin-positive interneurons in brain physiology and Alzheimer's disease. Mol Psychiatry 2023; 28:4954-4967. [PMID: 37419975 PMCID: PMC11041664 DOI: 10.1038/s41380-023-02168-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 06/26/2023] [Accepted: 06/26/2023] [Indexed: 07/09/2023]
Abstract
Fast-spiking parvalbumin (PV) interneurons are inhibitory interneurons with unique morphological and functional properties that allow them to precisely control local circuitry, brain networks and memory processing. Since the discovery in 1987 that PV is expressed in a subset of fast-spiking GABAergic inhibitory neurons, our knowledge of the complex molecular and physiological properties of these cells has been expanding. In this review, we highlight the specific properties of PV neurons that allow them to fire at high frequency and with high reliability, enabling them to control network oscillations and shape the encoding, consolidation and retrieval of memories. We next discuss multiple studies reporting PV neuron impairment as a critical step in neuronal network dysfunction and cognitive decline in mouse models of Alzheimer's disease (AD). Finally, we propose potential mechanisms underlying PV neuron dysfunction in AD and we argue that early changes in PV neuron activity could be a causal step in AD-associated network and memory impairment and a significant contributor to disease pathogenesis.
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Affiliation(s)
- Sara Hijazi
- Department of Pharmacology, University of Oxford, Oxford, OX1 3QT, UK
| | - August B Smit
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, 1081 HV, Amsterdam, The Netherlands
| | - Ronald E van Kesteren
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, 1081 HV, Amsterdam, The Netherlands.
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3
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Melgosa-Ecenarro L, Doostdar N, Radulescu CI, Jackson JS, Barnes SJ. Pinpointing the locus of GABAergic vulnerability in Alzheimer's disease. Semin Cell Dev Biol 2023; 139:35-54. [PMID: 35963663 DOI: 10.1016/j.semcdb.2022.06.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 06/30/2022] [Accepted: 06/30/2022] [Indexed: 12/31/2022]
Abstract
The early stages of Alzheimer's disease (AD) have been linked to microcircuit dysfunction and pathophysiological neuronal firing in several brain regions. Inhibitory GABAergic microcircuitry is a critical feature of stable neural-circuit function in the healthy brain, and its dysregulation has therefore been proposed as contributing to AD-related pathophysiology. However, exactly how the critical balance between excitatory and inhibitory microcircuitry is modified by AD pathogenesis remains unclear. Here, we set the current evidence implicating dysfunctional GABAergic microcircuitry as a driver of early AD pathophysiology in a simple conceptual framework. Our framework is based on a generalised reductionist model of firing-rate control by local feedback inhibition. We use this framework to consider multiple loci that may be vulnerable to disruption by AD pathogenesis. We first start with evidence investigating how AD-related processes may impact the gross number of inhibitory neurons in the network. We then move to discuss how pathology may impact intrinsic cellular properties and firing thresholds of GABAergic neurons. Finally, we cover how AD-related pathogenesis may disrupt synaptic connectivity between excitatory and inhibitory neurons. We use the feedback inhibition framework to discuss and organise the available evidence from both preclinical rodent work and human studies in AD patients and conclude by identifying key questions and understudied areas for future investigation.
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Affiliation(s)
- Leire Melgosa-Ecenarro
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
| | - Nazanin Doostdar
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
| | - Carola I Radulescu
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
| | - Johanna S Jackson
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
| | - Samuel J Barnes
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK.
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4
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Zhu L, Fan JH, Chao FL, Zhou CN, Jiang L, Zhang Y, Luo YM, Zhang L, Xiao Q, Yang H, Zhang SS, Wu H, Tang Y. Running exercise protects spinophilin-immunoreactive puncta and neurons in the medial prefrontal cortex of APP/PS1 transgenic mice. J Comp Neurol 2021; 530:858-870. [PMID: 34585379 DOI: 10.1002/cne.25252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 09/15/2021] [Accepted: 09/17/2021] [Indexed: 11/06/2022]
Abstract
The medial prefrontal cortex (mPFC) is thought to be closely associated with emotional processes, decision making, and memory. Previous studies have identified the prefrontal cortex as one of the most vulnerable brain regions in Alzheimer's disease (AD). Running exercise has widely been recognized as a simple and effective method of physical activity that enhances brain function and slows the progression of AD. However, the effect of exercise on the mPFC of AD is unclear. To address these issues, we investigated the effects of 4 months of exercise on the numbers of spinophilin-immunoreactive puncta and neurons in the mPFC of 12-month-old APPswe/PSEN1dE9 (APP/PS1) transgenic AD model mice using stereological methods. The spatial learning and memory abilities of mice were tested using the Morris water maze. Four months of running exercise delayed declines in spatial learning and memory abilities. The stereological results showed significantly lower numbers of spinophilin-immunoreactive puncta and neurons in the mPFC of APP/PS1 mice than in the wild-type control group. The numbers of spinophilin-immunoreactive puncta and neurons in the mPFC of running APP/PS1 mice were significantly greater than those in the APP/PS1 control mice. In addition, running-induced improvements in spatial learning and memory were significantly associated with running-induced increases in spinophilin-immunoreactive puncta and neurons numbers in the mPFC. Running exercise could delay the loss of spinophilin-immunoreactive puncta and neurons in the mPFC of APP/PS1 mice. This finding might provide an important structural basis for exercise-induced improvements in the spatial learning and memory abilities of individuals with AD.
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Affiliation(s)
- Lin Zhu
- Department of Histology and Embryology, Basic Medical College, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Jin-Hua Fan
- School of Life Sciences, Southwest University, Chongqing, P. R. China
| | - Feng-Lei Chao
- Department of Histology and Embryology, Basic Medical College, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Chun-Ni Zhou
- Department of Histology and Embryology, Basic Medical College, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Lin Jiang
- Lab Teaching & Management Center, Chongqing Medical University, Chongqing, P. R. China
| | - Yi Zhang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, P. R. China
| | - Yan-Min Luo
- Department of Physiology, Chongqing Medical University, Chongqing, P. R. China
| | - Lei Zhang
- Department of Histology and Embryology, Basic Medical College, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Qian Xiao
- Department of Radioactive Medicine, Chongqing Medical University, Chongqing, P. R. China
| | - Hao Yang
- Department of Histology and Embryology, Basic Medical College, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Shan-Shan Zhang
- Department of Histology and Embryology, Basic Medical College, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Hong Wu
- Department of Histology and Embryology, Basic Medical College, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Yong Tang
- Department of Histology and Embryology, Basic Medical College, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
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5
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Giesers NK, Wirths O. Loss of Hippocampal Calretinin and Parvalbumin Interneurons in the 5XFAD Mouse Model of Alzheimer's Disease. ASN Neuro 2021; 12:1759091420925356. [PMID: 32423230 PMCID: PMC7238451 DOI: 10.1177/1759091420925356] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The deposition of amyloid-β peptides in the form of extracellular plaques
and neuronal degeneration belong to the hallmark features of
Alzheimer’s disease (AD). In addition, impaired calcium homeostasis
and altered levels in calcium-binding proteins seem to be associated
with the disease process. In this study, calretinin- (CR) and
parvalbumin- (PV) positive gamma-aminobutyric acid-producing
(GABAergic) interneurons were quantified in different hippocampal
subfields of 12-month-old wild-type mice, as well as in the transgenic
AD mouse models 5XFAD and Tg4-42. While, in comparison with wild-type
mice, CR-positive interneurons were mainly reduced in the CA1 and
CA2/3 regions in plaque-bearing 5XFAD mice, PV-positive interneurons
were reduced in all analyzed subfields including the dentate gyrus. No
reduction in CR- and PV-positive interneuron numbers was detected in
the non-plaque-forming Tg4-42 mouse, although this model has been
previously demonstrated to harbor a massive loss of CA1 pyramidal
neurons. These results provide information about hippocampal
interneuron numbers in two relevant AD mouse models, suggesting that
interneuron loss in this brain region may be related to extracellular
amyloid burden.
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Affiliation(s)
- Naomi K Giesers
- Department of Psychiatry and Psychotherapy, Molecular Psychiatry, University Medical Center (UMG), Georg-August-University, Göttingen, Germany
| | - Oliver Wirths
- Department of Psychiatry and Psychotherapy, Molecular Psychiatry, University Medical Center (UMG), Georg-August-University, Göttingen, Germany
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6
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Cellular correlates of gray matter volume changes in magnetic resonance morphometry identified by two-photon microscopy. Sci Rep 2021; 11:4234. [PMID: 33608622 PMCID: PMC7895945 DOI: 10.1038/s41598-021-83491-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 02/01/2021] [Indexed: 12/11/2022] Open
Abstract
Magnetic resonance imaging (MRI) of the brain combined with voxel-based morphometry (VBM) revealed changes in gray matter volume (GMV) in various disorders. However, the cellular basis of GMV changes has remained largely unclear. We correlated changes in GMV with cellular metrics by imaging mice with MRI and two-photon in vivo microscopy at three time points within 12 weeks, taking advantage of age-dependent changes in brain structure. Imaging fluorescent cell nuclei allowed inferences on (i) physical tissue volume as determined from reference spaces outlined by nuclei, (ii) cell density, (iii) the extent of cell clustering, and (iv) the volume of cell nuclei. Our data indicate that physical tissue volume alterations only account for 13.0% of the variance in GMV change. However, when including comprehensive measurements of nucleus volume and cell density, 35.6% of the GMV variance could be explained, highlighting the influence of distinct cellular mechanisms on VBM results.
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7
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Ali F, Baringer SL, Neal A, Choi EY, Kwan AC. Parvalbumin-Positive Neuron Loss and Amyloid-β Deposits in the Frontal Cortex of Alzheimer's Disease-Related Mice. J Alzheimers Dis 2020; 72:1323-1339. [PMID: 31743995 DOI: 10.3233/jad-181190] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Alzheimer's disease (AD) has several hallmark features including amyloid-β (Aβ) plaque deposits and neuronal loss. Here, we characterized Aβ plaque aggregation and parvalbumin-positive (PV) GABAergic neurons in 6-9-month-old 5xFAD mice harboring mutations associated with familial AD. We used immunofluorescence staining to compare three regions in the frontal cortex-prelimbic (PrL), cingulate (Cg, including Cg1 and Cg2), and secondary motor (M2) cortices-along with primary somatosensory (S1) cortex. We quantified the density of Aβ plaques, which showed significant laminar and regional vulnerability. There were more plaques of larger sizes in deep layers compared to superficial layers. Total plaque burden was higher in frontal regions compared to S1. We also found layer- and region-specific differences across genotype in the density of PV interneurons. PV neuron density was lower in 5xFAD mice than wild-type, particularly in deep layers of frontal regions, with Cg (-50%) and M2 (-39%) exhibiting the largest reduction. Using in vivo two-photon imaging, we longitudinally visualized the loss of frontal cortical PV neurons across four weeks in the AD mouse model. Overall, these results provide information about Aβ deposits and PV neuron density in a widely used mouse model for AD, implicating deep layers of frontal cortical regions as being especially vulnerable.
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Affiliation(s)
- Farhan Ali
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | | | - Arianna Neal
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Esther Y Choi
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Alex C Kwan
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA.,Department of Neuroscience, Yale University School of Medicine, New Haven, CT, USA
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8
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Neuron Loss in Alzheimer's Disease: Translation in Transgenic Mouse Models. Int J Mol Sci 2020; 21:ijms21218144. [PMID: 33143374 PMCID: PMC7663280 DOI: 10.3390/ijms21218144] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 10/28/2020] [Accepted: 10/28/2020] [Indexed: 02/07/2023] Open
Abstract
Transgenic mouse models represent an essential tool for the exploration of Alzheimer’s disease (AD) pathological mechanisms and the development of novel treatments, which at present provide only symptomatic and transient effects. While a variety of mouse models successfully reflects the main neuropathological hallmarks of AD, such as extracellular amyloid-β (Aβ) deposits, intracellular accumulation of Tau protein, the development of micro- and astrogliosis, as well as behavioral deficits, substantial neuron loss, as a key feature of the disease, seems to be more difficult to achieve. In this review, we summarize information on classic and more recent transgenic mouse models for AD, focusing in particular on loss of pyramidal, inter-, and cholinergic neurons. Although the cause of neuron loss in AD is still a matter of scientific debate, it seems to be linked to intraneuronal Aβ accumulation in several transgenic mouse models, especially in pyramidal neurons.
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9
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Xu Y, Zhao M, Han Y, Zhang H. GABAergic Inhibitory Interneuron Deficits in Alzheimer's Disease: Implications for Treatment. Front Neurosci 2020; 14:660. [PMID: 32714136 PMCID: PMC7344222 DOI: 10.3389/fnins.2020.00660] [Citation(s) in RCA: 89] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 05/28/2020] [Indexed: 12/16/2022] Open
Abstract
Alzheimer’s disease (AD) is a neurodegenerative disorder characterized clinically by severe cognitive deficits and pathologically by amyloid plaques, neuronal loss, and neurofibrillary tangles. Abnormal amyloid β-protein (Aβ) deposition in the brain is often thought of as a major initiating factor in AD neuropathology. However, gamma-aminobutyric acid (GABA) inhibitory interneurons are resistant to Aβ deposition, and Aβ decreases synaptic glutamatergic transmission to decrease neural network activity. Furthermore, there is now evidence suggesting that neural network activity is aberrantly increased in AD patients and animal models due to functional deficits in and decreased activity of GABA inhibitory interneurons, contributing to cognitive deficits. Here we describe the roles played by excitatory neurons and GABA inhibitory interneurons in Aβ-induced cognitive deficits and how altered GABA interneurons regulate AD neuropathology. We also comprehensively review recent studies on how GABA interneurons and GABA receptors can be exploited for therapeutic benefit. GABA interneurons are an emerging therapeutic target in AD, with further clinical trials urgently warranted.
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Affiliation(s)
- Yilan Xu
- Neurodegeneration and Neuroregeneration Laboratory, Department of Basic Medicine, School of Medicine, Shaoxing University, Shaoxing, China
| | - Manna Zhao
- Neurodegeneration and Neuroregeneration Laboratory, Department of Basic Medicine, School of Medicine, Shaoxing University, Shaoxing, China
| | - Yuying Han
- Neurodegeneration and Neuroregeneration Laboratory, Department of Basic Medicine, School of Medicine, Shaoxing University, Shaoxing, China
| | - Heng Zhang
- Neurodegeneration and Neuroregeneration Laboratory, Department of Basic Medicine, School of Medicine, Shaoxing University, Shaoxing, China
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10
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Scearce-Levie K, Sanchez PE, Lewcock JW. Leveraging preclinical models for the development of Alzheimer disease therapeutics. Nat Rev Drug Discov 2020; 19:447-462. [PMID: 32612262 DOI: 10.1038/s41573-020-0065-9] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/26/2020] [Indexed: 02/06/2023]
Abstract
A large number of mouse models have been engineered, characterized and used to advance biomedical research in Alzheimer disease (AD). Early models simply damaged the rodent brain through toxins or lesions. Later, the spread of genetic engineering technology enabled investigators to develop models of familial AD by overexpressing human genes such as those encoding amyloid precursor protein (APP) or presenilins (PSEN1 or PSEN2) carrying mutations linked to early-onset AD. Recently, more complex models have sought to explore the impact of multiple genetic risk factors in the context of different biological challenges. Although none of these models has proven to be a fully faithful reproduction of the human disease, models remain essential as tools to improve our understanding of AD biology, conduct thorough pharmacokinetic and pharmacodynamic analyses, discover translatable biomarkers and evaluate specific therapeutic approaches. To realize the full potential of animal models as new technologies and knowledge become available, it is critical to define an optimal strategy for their use. Here, we review progress and challenges in the use of AD mouse models, highlight emerging scientific innovations in model development, and introduce a conceptual framework for use of preclinical models for therapeutic development.
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11
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Behavioral defects associated with amygdala and cortical dysfunction in mice with seeded α-synuclein inclusions. Neurobiol Dis 2019; 134:104708. [PMID: 31837424 PMCID: PMC7206936 DOI: 10.1016/j.nbd.2019.104708] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 11/20/2019] [Accepted: 12/08/2019] [Indexed: 12/20/2022] Open
Abstract
Parkinson’s disease (PD) is defined by motor symptoms such as tremor at rest, bradykinesia, postural instability, and stiffness. In addition to the classical motor defects that define PD, up to 80% of patients experience cognitive changes and psychiatric disturbances, referred to as PD dementia (PDD). Pathologically, PD is characterized by loss of dopaminergic neurons in the substantia nigra pars compacta (SNpc) and intracellular inclusions, called Lewy bodies and Lewy neurites, composed mostly of α-synuclein. Much of PD research has focused on the role of α-synuclein aggregates in degeneration of SNpc dopamine neurons because of the impact of loss of striatal dopamine on the classical motor phenotypes. However, abundant Lewy pathology is also found in other brain regions including the cortex and limbic brain regions such as the amygdala, which may contribute to non-motor phenotypes. Little is known about the consequences of α-synuclein inclusions in these brain regions, or in neuronal subtypes other than dopamine neurons. This project expands knowledge on how α-synuclein inclusions disrupt behavior, specifically non-motor symptoms of synucleinopathies. We show that bilateral injections of fibrils into the striatum results in robust bilateral α-synuclein inclusion formation in the cortex and amygdala. Inclusions in the amygdala and prefrontal cortex primarily localize to excitatory neurons, but unbiased stereology shows no significant loss of neurons in the amygdala or cortex. Fibril injected mice show defects in a social dominance behavioral task and fear conditioning, tasks that are associated with prefrontal cortex and amygdala function. Together, these observations suggest that seeded α-synuclein inclusion formation impairs behaviors associated with cortical and amygdala function, without causing cell loss, in brain areas that may play important roles in the complex cognitive features of PDD
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12
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Nasiri E, Alizadeh A, Roushandeh AM, Gazor R, Hashemi-Firouzi N, Golipoor Z. Melatonin-pretreated adipose-derived mesenchymal stem cells efficeintly improved learning, memory, and cognition in an animal model of Alzheimer's disease. Metab Brain Dis 2019; 34:1131-1143. [PMID: 31129766 DOI: 10.1007/s11011-019-00421-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 04/17/2019] [Indexed: 12/19/2022]
Abstract
Currently, mesenchymal stem cells (MSCs) based therapy has extensive attraction for Alzheimer's disease (AD). However, low survival rate of MSCs after transplantation is a huge challenging. The current study aimed to improve adipose-derived MSCs (AD-MSCs)-based therapy by their pre-treatment with melatonin (MT) 'a well-known antioxidant' in an animal model of AD. In this study, after isolating rat AD-MSCs from the epididymal white adipose tissues, the cells were pretreated with 5μM of MT for 24 hours. Forty male Wistar rats were randomly allocated to control, sham, amyloid-beta (Aβ) peptide, AD-MSCs and MT-pretreated ADMSCs groups. The novel object recognition, passive avoidance test, Morris water maze and open field test were performed two months following the cell transplantation. The rats were sacrificed 69 days following cell therapy. The brain tissues were removed for histopathological analysis and also immunohistochemistry was performed for two Aβ1-42 and Iba1 proteins. It has been revealed that both AD-MSCs and MT-AD-MSCs migrated to brain tissues after intravenous transplantation. However, MT-ADMSCs significantly improved learning, memory and cognition compared with AD-MSCs (P<0.05). Furthermore, clearance of Aβ deposition and reduction of microglial cells were significantly increased in the MT-ADMSCs compared with AD-MSCs. Although stem cell therapy has been introduced as a promising strategy in neurodegenerative diseases, however, its therapeutic properties are limited. It is suggested that pretreatment of MSCs with melatonin partly would increase the cells efficiency and consequently could decrease AD complication including memory and cognition.
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Affiliation(s)
- Ebrahim Nasiri
- Cellular and Molecular Research Center, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran
| | - Akram Alizadeh
- Department of Tissue Engineering and Applied Cell Sciences, Faculty of Medicine, Semnan University of Medical Sciences, Semnan, Iran
| | | | - Rouhollah Gazor
- Cellular and Molecular Research Center, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran
| | | | - Zoleikha Golipoor
- Cellular and Molecular Research Center, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.
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13
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Hu YH, Yang J, Zhang Y, Liu KC, Liu T, Sun J, Wang XJ. Synthesis and biological evaluation of 3-(4-aminophenyl)-coumarin derivatives as potential anti-Alzheimer's disease agents. J Enzyme Inhib Med Chem 2019; 34:1083-1092. [PMID: 31117844 PMCID: PMC6534212 DOI: 10.1080/14756366.2019.1615484] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The work is focused on the design of drugs that prevent and treat Alzheimer’s disease (AD) and its complications. A series of 3–(4-aminophenyl)-coumarin derivatives designed, synthesised, fully characterised and evaluated in vitro/vivo. The biological assay experiments showed that some compounds displayed a clearly selective inhibition for acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE). Among all compounds, compound 4m exhibited the highest AChE inhibition with an IC50 value of 0.091 ± 0.011 µM and compound 4k exhibited the highest BuChE inhibition with an IC50 value of 0.559 ± 0.017 µM. A zebrafish behaviour analyser (Zebrobox) was used to determine the behavioural effects of the active compound on the movement distance of the aluminium chloride-induced zebrafish. Compound 4m offered a potential drug design concept for the development of therapeutic or preventive agents for AD and its complications.
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Affiliation(s)
- Yu-Heng Hu
- a School of Medicine and Life Sciences , University of Jinan-Shandong Academy of Medical Sciences , Jinan , PR China.,b Institute of Materia Medica , Shandong Academy of Medical Sciences , Jinan , PR China.,c Key Laboratory for Biotech-Drugs Ministry of Health , Jinan , PR China.,d Key Laboratory for Rare & Uncommon Diseases of Shandong Province , Jinan , PR China
| | - Jie Yang
- a School of Medicine and Life Sciences , University of Jinan-Shandong Academy of Medical Sciences , Jinan , PR China.,b Institute of Materia Medica , Shandong Academy of Medical Sciences , Jinan , PR China.,c Key Laboratory for Biotech-Drugs Ministry of Health , Jinan , PR China.,d Key Laboratory for Rare & Uncommon Diseases of Shandong Province , Jinan , PR China
| | - Yun Zhang
- e Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , PR China
| | - Ke-Chun Liu
- e Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , PR China
| | - Teng Liu
- a School of Medicine and Life Sciences , University of Jinan-Shandong Academy of Medical Sciences , Jinan , PR China.,b Institute of Materia Medica , Shandong Academy of Medical Sciences , Jinan , PR China.,c Key Laboratory for Biotech-Drugs Ministry of Health , Jinan , PR China.,d Key Laboratory for Rare & Uncommon Diseases of Shandong Province , Jinan , PR China
| | - Jie Sun
- a School of Medicine and Life Sciences , University of Jinan-Shandong Academy of Medical Sciences , Jinan , PR China.,b Institute of Materia Medica , Shandong Academy of Medical Sciences , Jinan , PR China.,c Key Laboratory for Biotech-Drugs Ministry of Health , Jinan , PR China.,d Key Laboratory for Rare & Uncommon Diseases of Shandong Province , Jinan , PR China
| | - Xiao-Jing Wang
- a School of Medicine and Life Sciences , University of Jinan-Shandong Academy of Medical Sciences , Jinan , PR China.,b Institute of Materia Medica , Shandong Academy of Medical Sciences , Jinan , PR China.,c Key Laboratory for Biotech-Drugs Ministry of Health , Jinan , PR China.,d Key Laboratory for Rare & Uncommon Diseases of Shandong Province , Jinan , PR China
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14
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Lu WT, Sun SQ, Li Y, Xu SY, Gan SW, Xu J, Qiu GP, Zhuo F, Huang SQ, Jiang XL, Huang J. Curcumin Ameliorates Memory Deficits by Enhancing Lactate Content and MCT2 Expression in APP/PS1 Transgenic Mouse Model of Alzheimer's Disease. Anat Rec (Hoboken) 2018; 302:332-338. [PMID: 30312017 DOI: 10.1002/ar.23969] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 05/01/2018] [Accepted: 06/03/2018] [Indexed: 12/16/2022]
Abstract
Curcumin is a natural product with several anti-Alzheimer's disease (AD) neuroprotective properties. This study aimed to investigate the effects of curcumin on memory deficits, lactate content, and monocarboxylate transporter 2 (MCT2) in APP/PS1 mouse model of AD. APP/PS1 transgenic mice and wild-type (WT) C57BL/6J mice were used in the present study. Spatial learning and memory of the mice was detected using Morris water-maze test. Cerebral cortex and hippocampus lactate contents were detected using lactate assay. MCT2 expression in the cerebral cortex and hippocampus was examined by immunohistochemistry and Western blotting. Results showed that spatial learning and memory deficits were improved in curcumin-treated APP/PS1 mouse group compared with those in APP/PS1 mice group. Brain lactate content and MCT2 protein level were increased in curcumin-treated APP/PS1 mice than in APP/PS1 mice. In summary, our findings indicate that curcumin could ameliorate memory impairments in APP/PS1 mouse model of AD. This phenomenon may be at least partially due to its improving effect on the lactate content and MCT2 protein expression in the brain. Anat Rec, 302:332-338, 2019. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Wei-Tian Lu
- Institute of Neuroscience, Chongqing Medical University, Chongqing, 40016, China.,Department of Anatomy, Chongqing Medical University, Chongqing, 40016, China
| | - Shan-Quan Sun
- Institute of Neuroscience, Chongqing Medical University, Chongqing, 40016, China.,Department of Anatomy, Chongqing Medical University, Chongqing, 40016, China
| | - Yu Li
- Institute of Neuroscience, Chongqing Medical University, Chongqing, 40016, China
| | - Shi-Ye Xu
- Institute of Neuroscience, Chongqing Medical University, Chongqing, 40016, China.,Department of Anatomy, Chongqing Medical University, Chongqing, 40016, China
| | - Sheng-Wei Gan
- Institute of Neuroscience, Chongqing Medical University, Chongqing, 40016, China.,Department of Anatomy, Chongqing Medical University, Chongqing, 40016, China
| | - Jin Xu
- Institute of Neuroscience, Chongqing Medical University, Chongqing, 40016, China.,Department of Anatomy, Chongqing Medical University, Chongqing, 40016, China
| | - Guo-Ping Qiu
- Institute of Neuroscience, Chongqing Medical University, Chongqing, 40016, China
| | - Fei Zhuo
- Institute of Neuroscience, Chongqing Medical University, Chongqing, 40016, China
| | - Si-Qin Huang
- Traditional Chinese Medicine College, Chongqing Medical University, Chongqing, 40016, China
| | - Xu-Li Jiang
- Department of Anatomy, Science and Technology College of Hubei University for Nationalities, Enshi, 445000, China
| | - Juan Huang
- Institute of Neuroscience, Chongqing Medical University, Chongqing, 40016, China.,Department of Anatomy, Chongqing Medical University, Chongqing, 40016, China
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15
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Madsen JB, Folke J, Pakkenberg B. Stereological Quantification of Plaques and Tangles in Neocortex from Alzheimer’s Disease Patients. J Alzheimers Dis 2018; 64:723-734. [DOI: 10.3233/jad-180105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Jes Buster Madsen
- Research Laboratory for Stereology and Neuroscience, Bispebjerg-Frederiksberg Hospital, Denmark
| | - Jonas Folke
- Research Laboratory for Stereology and Neuroscience, Bispebjerg-Frederiksberg Hospital, Denmark
| | - Bente Pakkenberg
- Research Laboratory for Stereology and Neuroscience, Bispebjerg-Frederiksberg Hospital, Denmark
- Institute of Clinical Medicine, Faculty of Health, University of Copenhagen, Denmark
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16
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Ovsepian SV, Blazquez-Llorca L, Freitag SV, Rodrigues EF, Herms J. Ambient Glutamate Promotes Paroxysmal Hyperactivity in Cortical Pyramidal Neurons at Amyloid Plaques via Presynaptic mGluR1 Receptors. Cereb Cortex 2018; 27:4733-4749. [PMID: 27600841 DOI: 10.1093/cercor/bhw267] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 08/03/2016] [Indexed: 02/06/2023] Open
Abstract
Synaptic dysfunctions and altered neuronal activity play major role in the pathophysiology of Alzheimer's disease (AD), with underlying mechanisms largely unknown. We report that in the prefrontal cortex of amyloid precursor protein-presenilin 1 and APP23 AD mice, baseline activity of pyramidal cells is disrupted by episodes of paroxysmal hyperactivity. Induced by spontaneous EPSC bursts, these incidents are prevalent in neurons proximal to amyloid plaques and involve enhanced activity of glutamate with metabotropic effects. Abolition of EPSC bursts by tetrodotoxin and SERCA ATPase blockers thapsigargin or cyclopiasonic acid suggests their presynaptic origin and sensitized store-released calcium. Accordingly, the rate of EPSC bursts activated by single axon stimulation is enhanced. Aggravation of the hyperactivity by blockers of excitatory amino acid transporter (±)-HIP-A and DL-TBOA together with histochemical and ultrastructural evidence for enrichment of plaque-related dystrophies with synaptic vesicles and SNARE protein SNAP-25 infer the later as hot-spots for ectopic release of glutamate. Inhibition of EPSC bursts by I/II mGluR1 blocker MCPG or selective mGluR1 antagonist LY367385 implicate metabotropic glutamatergic effects in generation of paroxysmal bursts. These findings demonstrate for the first time that at amyloid plaques, enhanced activity of nonsynaptic glutamate can promote irregular EPSC bursts with hyperactivity of pyramidal cells via mGluR1 receptors.
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Affiliation(s)
- Saak Victor Ovsepian
- German Center for Neurodegenerative Diseases (DZNE), Feodor-Lynen-Straße 17, 81377 Munich, Germany.,Center for Neuropathology and Prion Research, Ludwig Maximilian University, Feodor-Lynen-Straße 23, 81377 Munich, Germany
| | - Lidia Blazquez-Llorca
- German Center for Neurodegenerative Diseases (DZNE), Feodor-Lynen-Straße 17, 81377 Munich, Germany.,Center for Neuropathology and Prion Research, Ludwig Maximilian University, Feodor-Lynen-Straße 23, 81377 Munich, Germany
| | - Susana Valero Freitag
- German Center for Neurodegenerative Diseases (DZNE), Feodor-Lynen-Straße 17, 81377Munich, Germany
| | - Eva Ferreira Rodrigues
- Center for Neuropathology and Prion Research, Ludwig Maximilian University, Feodor-Lynen-Straße 23, 81377 Munich, Germany.,Munich Cluster of Systems Neurology (SyNergy), Ludwig Maximilian University, Feodor-Lynen-Straße 17, 81377 Munich, Germany
| | - Jochen Herms
- German Center for Neurodegenerative Diseases (DZNE), Feodor-Lynen-Straße 17, 81377 Munich, Germany.,Center for Neuropathology and Prion Research, Ludwig Maximilian University, Feodor-Lynen-Straße 23, 81377 Munich, Germany.,Munich Cluster of Systems Neurology (SyNergy), Ludwig Maximilian University, Feodor-Lynen-Straße 17, 81377 Munich, Germany
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17
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Zallo F, Gardenal E, Verkhratsky A, Rodríguez JJ. Loss of calretinin and parvalbumin positive interneurones in the hippocampal CA1 of aged Alzheimer's disease mice. Neurosci Lett 2018; 681:19-25. [PMID: 29782955 DOI: 10.1016/j.neulet.2018.05.027] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 04/30/2018] [Accepted: 05/17/2018] [Indexed: 01/19/2023]
Abstract
Neuronal degeneration associated with Alzheimer's disease (AD), is linked to impaired calcium homeostasis and to changes in calcium-binding proteins (CBPs). The AD-related modification of neuronal CBPs remains controversial. Here we analysed the presence and expression of calretinin (CR) and parvalbumin (PV) in the hippocampal CA1 neurones of 18 months old 3xTg-AD mice compared to non-Tg animals. We found a layer specific decrease in number of interneurones expressing CR and PV (by 33.7% and 52%, respectively). Expression of PV decreased (by 13.8%) in PV-positive neurones, whereas expression of CR did not change in CR positive cells. The loss of specific subpopulations of Ca2+-binding proteins expressing interneurones (CR and PV) together with the decrease of PV in the surviving cells may be linked to their vulnerability to AD pathology. Specific loss of inhibitory interneurones with age could contribute to overall increase in the network excitability associated with AD.
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Affiliation(s)
- Fatima Zallo
- BioCruces Health Research Institute, 48903, Barakaldo, Spain; Department of Neuroscience, University of the Basque Country UPV/EHU, 48940, Leioa, Spain
| | - Emanuela Gardenal
- Department of Neuroscience, University of the Basque Country UPV/EHU, 48940, Leioa, Spain; Human Histology and Embryology Unit, Medical School, University of Verona, 37134, Verona, Italy
| | - Alexei Verkhratsky
- Department of Neuroscience, University of the Basque Country UPV/EHU, 48940, Leioa, Spain; IKERBASQUE, Basque Foundation for Science, 48013-Bilbao, Medical School, Spain; Achúcarro Basque Center for Neuroscience, 48940, Leioa, Spain; Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, M13 9PL, United Kingdom; Center for Basic and Translational Neuroscience, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, 2200, Denmark
| | - José Julio Rodríguez
- BioCruces Health Research Institute, 48903, Barakaldo, Spain; Department of Neuroscience, University of the Basque Country UPV/EHU, 48940, Leioa, Spain; IKERBASQUE, Basque Foundation for Science, 48013-Bilbao, Medical School, Spain.
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18
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Wang S, Bolós M, Clark R, Cullen CL, Southam KA, Foa L, Dickson TC, Young KM. Amyloid β precursor protein regulates neuron survival and maturation in the adult mouse brain. Mol Cell Neurosci 2016; 77:21-33. [DOI: 10.1016/j.mcn.2016.09.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 08/12/2016] [Accepted: 09/19/2016] [Indexed: 01/08/2023] Open
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19
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Design-Based Stereology for Evaluation of Histological Parameters. J Mol Neurosci 2016; 61:325-342. [PMID: 27826759 DOI: 10.1007/s12031-016-0858-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 10/21/2016] [Indexed: 12/21/2022]
Abstract
Valid quantification of organ volume and total cell numbers are crucial parameters for morphometric studies. The number of a specific cell type cannot be simply deduced from the number of its profiles found in thin tissue sections, as this parameter also depends on cell volume, tissue orientation as well as tissue atrophy. Design-based stereology has become the method of choice for unbiased, reproducible total cell number quantification. Steps described in this protocol include transcardial perfusion of mice, postfixation, and cryoprotection of the region of interest (ROI), followed by the preparation of a systematically and randomly sampled series of thick sections through the entire ROI. Furthermore, it is described how to perform immuno-histochemical staining of such thick cryo-sections, followed by providing a guidance for quantification of the ROI volume, the generation of unbiased virtual counting spaces, and steps to work with these counting spaces to obtain an unbiased estimate of total cell numbers.
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20
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Povysheva NV, Johnson JW. Effects of memantine on the excitation-inhibition balance in prefrontal cortex. Neurobiol Dis 2016; 96:75-83. [PMID: 27546057 DOI: 10.1016/j.nbd.2016.08.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 08/07/2016] [Accepted: 08/16/2016] [Indexed: 11/26/2022] Open
Abstract
Memantine is one of the few drugs currently approved for treatment of Alzheimer's disease (AD). The clinical effects of memantine are thought to be associated with inhibition of NMDA receptors (NMDARs). Surprisingly, other open-channel NMDAR blockers have unacceptable side effects that prevent their consideration for AD treatment. One of the mechanisms proposed to explain the therapeutic benefits of memantine involves preferential decrease of excitatory drive to inhibitory neurons in the cortical circuitry and consequent changes in balance between excitation and inhibition (E/I). In this study we addressed effects of memantine on E/I balance in the prefrontal cortex (PFC). We found that a moderate concentration of memantine shifted E/I balance away from inhibition in the PFC circuitry. Indeed, memantine decreased the frequency and amplitude of spontaneous inhibitory postsynaptic currents in pyramidal neurons while leaving spontaneous excitatory postsynaptic currents unaffected. These circuitry effects of memantine were occluded by the competitive NMDAR inhibitor AP-5, and thus are associated with NMDAR inhibition. We also found that memantine decreased feed-forward disynaptic inhibitory input to pyramidal neurons, which is thought to be mediated by parvalbumin (PV)-positive interneurons. Accordingly, memantine caused a greater decrease of the amplitude of NMDAR-mediated synaptic responses in PV-positive interneurons than in pyramidal neurons. Finally, memantine reduced firing activity in PV-positive interneurons while increasing firing in pyramidal neurons. This study elucidates a novel mechanism of action of memantine associated with shifting of the E/I balance away from inhibition in neocortical circuitry, and provides important insights for AD drug development.
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Affiliation(s)
- Nadezhda V Povysheva
- Department of Neuroscience, and Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA 15260, United States.
| | - Jon W Johnson
- Department of Neuroscience, and Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA 15260, United States; Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA 15260, United States.
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21
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Albuquerque MS, Mahar I, Davoli MA, Chabot JG, Mechawar N, Quirion R, Krantic S. Regional and sub-regional differences in hippocampal GABAergic neuronal vulnerability in the TgCRND8 mouse model of Alzheimer's disease. Front Aging Neurosci 2015; 7:30. [PMID: 25852545 PMCID: PMC4371759 DOI: 10.3389/fnagi.2015.00030] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Accepted: 02/26/2015] [Indexed: 01/16/2023] Open
Abstract
Hippocampal network activity is predominantly coordinated by γ-amino-butyric acid (GABA)ergic neurons. We have previously hypothesized that the altered excitability of hippocampal neurons in Alzheimer's disease (AD), which manifests as increased in vivo susceptibility to seizures in the TgCRND8 mouse model of AD, may be related to disruption of hippocampal GABAergic neurons. In agreement, our previous study in TgCRND8 mice has shown that hippocampal GABAergic neurons are more vulnerable to AD-related neuropathology than other types of neurons. To further explore the mechanisms behind the observed decrease of GABAergic neurons in 6 month-old TgCRND8 mice, we assessed the relative proportion of somatostatin (SOM), neuropeptide Y (NPY) and paravalbumin (PV) sub-types of GABAergic neurons at the regional and sub-regional level of the hippocampus. We found that NPY expressing GABAergic neurons were the most affected, as they were decreased in CA1-CA2 (pyramidal-, stratum oriens, stratum radiatum and molecular layers), CA3 (specifically in the stratum oriens) and dentate gyrus (specifically in the polymorphic layer) in TgCRND8 mice as compared to non-transgenic controls. SOM expressing GABAergic neurons were decreased in CA1-CA2 (specifically in the stratum oriens) and in the stratum radiatum of CA3, whereas PV neurons were significantly altered in stratum oriens sub-region of CA3. Taken together, these data provide new evidence for the relevance of hippocampal GABAergic neuronal network disruption as a mechanism underlying AD sequelae such as aberrant neuronal excitability, and further point to complex hippocampal regional and sub-regional variation in susceptibility to AD-related neuronal loss.
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Affiliation(s)
- Marilia S Albuquerque
- Douglas Mental Health University Institute Verdun, QC, Canada ; Laboratory of Biomedicine and Biotechnology, School of Arts, Sciences and Humanities, Universidade de São Paulo São Paulo, Brazil ; Graduation Course on Pharmacology, Institute of Biomedical Sciences, Universidade de São Paulo São Paulo, Brazil ; Research Group on Neuropharmacology of Aging São Paulo, Brazil
| | - Ian Mahar
- Douglas Mental Health University Institute Verdun, QC, Canada ; McGill Group for Suicide Studies, Douglas Mental Health University Institute Verdun, QC, Canada ; Integrated Program in Neuroscience, McGill University Montreal, QC, Canada
| | - Maria Antonietta Davoli
- Douglas Mental Health University Institute Verdun, QC, Canada ; McGill Group for Suicide Studies, Douglas Mental Health University Institute Verdun, QC, Canada
| | - Jean-Guy Chabot
- Douglas Mental Health University Institute Verdun, QC, Canada ; Integrated Program in Neuroscience, McGill University Montreal, QC, Canada
| | - Naguib Mechawar
- Douglas Mental Health University Institute Verdun, QC, Canada ; McGill Group for Suicide Studies, Douglas Mental Health University Institute Verdun, QC, Canada ; Integrated Program in Neuroscience, McGill University Montreal, QC, Canada ; Department of Psychiatry, McGill University Montreal, QC, Canada
| | - Rémi Quirion
- Douglas Mental Health University Institute Verdun, QC, Canada ; Integrated Program in Neuroscience, McGill University Montreal, QC, Canada
| | - Slavica Krantic
- Douglas Mental Health University Institute Verdun, QC, Canada ; Integrated Program in Neuroscience, McGill University Montreal, QC, Canada ; Department of Psychiatry, McGill University Montreal, QC, Canada ; Centre de Recherche des Cordeliers, INSERM, Université Paris Descartes, Sorbonne Paris Cité, UMR_S 1138, Université Pierre et Marie Curie Univ Paris 06, Sorbonne Universités Paris, France
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22
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Yan Y, Ma T, Gong K, Ao Q, Zhang X, Gong Y. Adipose-derived mesenchymal stem cell transplantation promotes adult neurogenesis in the brains of Alzheimer's disease mice. Neural Regen Res 2014; 9:798-805. [PMID: 25206892 PMCID: PMC4146257 DOI: 10.4103/1673-5374.131596] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/24/2014] [Indexed: 12/11/2022] Open
Abstract
In the present study, we transplanted adipose-derived mesenchymal stem cells into the hippocampi of APP/PS1 transgenic Alzheimer's disease model mice. Immunofluorescence staining revealed that the number of newly generated (BrdU(+)) cells in the subgranular zone of the dentate gyrus in the hippocampus was significantly higher in Alzheimer's disease mice after adipose-derived mesenchymal stem cell transplantation, and there was also a significant increase in the number of BrdU(+)/DCX(+) neuroblasts in these animals. Adipose-derived mesenchymal stem cell transplantation enhanced neurogenic activity in the subventricular zone as well. Furthermore, adipose-derived mesenchymal stem cell transplantation reduced oxidative stress and alleviated cognitive impairment in the mice. Based on these findings, we propose that adipose-derived mesenchymal stem cell transplantation enhances endogenous neurogenesis in both the subgranular and subventricular zones in APP/PS1 transgenic Alzheimer's disease mice, thereby facilitating functional recovery.
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Affiliation(s)
- Yufang Yan
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Tuo Ma
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Kai Gong
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Qiang Ao
- Institute of Neurological Disorders, Yuquan Hospital, Tsinghua University, Beijing, China
| | - Xiufang Zhang
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Yandao Gong
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
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23
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Brasnjevic I, Lardenoije R, Schmitz C, Van Der Kolk N, Dickstein DL, Takahashi H, Hof PR, Steinbusch HW, Rutten BP. REGION-SPECIFIC NEURON AND SYNAPSE LOSS IN THE HIPPOCAMPUS OF APP SL/PS1 KNOCK-IN MICE. Transl Neurosci 2013; 4:8-19. [PMID: 24829793 PMCID: PMC4018205 DOI: 10.2478/s13380-013-0111-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Transgenic mouse models with knock-in (KI) expression of human mutant amyloid precursor protein (APP) and/or human presenilin 1 (PS1) may be helpful to elucidate the cellular consequences of APP and PS1 misprocessing in the aging brain. Age-related alterations in total numbers of neurons and in numbers of synaptophysin-immunoreactive presynaptic boutons (SIPB), as well as the amyloid plaque load were analyzed in the hippocampal dentate gyrus (DG), CA3, and CA1-2 of 2- and 10-month-old APPSL/PS1 homozygous KI, APPSL (expressing human mutant APP751 carrying the Swedish [K670N/M671L] and London [V717I] mutations under Thy-1 promoter), and PS1 homozygous KI mice (expressing human PS1 mutations [M233T and L235P]). APPSL/PS1 homozygous KI mice, but neither APPSL mice nor PS1 homozygous KI mice, showed substantial age-related loss of neurons (-47.2%) and SIPB (-22.6%), specifically in CA1-2. PS1 homozygous KI mice showed an age-related increase in hippocampal granule cell numbers (+37.9%). Loss of neurons and SIPB greatly exceeded the amount of local extracellular Aβ aggregation and astrocytes, whereas region-specific accumulation of intraneuronal Aβ preceded neuron and synapse loss. An age-related increase in the ratio of SIPB to neuron numbers in CA1-2 of APPSL/PS1 homozygous KI mice was suggestive of compensatory synaptic plasticity. These findings indicate a region-selectivity in intra- and extraneuronal Aβ accumulation in connection with neuron and synapse loss in the hippocampus of APPSL/PS1 homozygous KI mice.
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Affiliation(s)
- Ivona Brasnjevic
- Department of Psychiatry and Neuropsychology, Maastricht University, 6200 MD Maastricht, The Netherlands
- European Graduate School of Neuroscience (EURON), 6200 MD Maastricht, The Netherlands
| | - Roy Lardenoije
- Department of Psychiatry and Neuropsychology, Maastricht University, 6200 MD Maastricht, The Netherlands
| | - Christoph Schmitz
- Department of Anatomy II, Institute of Anatomy, Ludwig-Maximilians-University, 80336 Munich, Germany
| | - Nicolien Van Der Kolk
- Department of Psychiatry and Neuropsychology, Maastricht University, 6200 MD Maastricht, The Netherlands
- European Graduate School of Neuroscience (EURON), 6200 MD Maastricht, The Netherlands
| | - Dara L. Dickstein
- Fishberg Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Hisaaki Takahashi
- Department of Molecular and Cellular Physiology, Graduate School of Medicine, Ehime University, 791-0295 Ehime, Japan
| | - Patrick R. Hof
- Fishberg Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Harry W.M. Steinbusch
- Department of Psychiatry and Neuropsychology, Maastricht University, 6200 MD Maastricht, The Netherlands
- European Graduate School of Neuroscience (EURON), 6200 MD Maastricht, The Netherlands
| | - Bart P.F. Rutten
- Department of Psychiatry and Neuropsychology, Maastricht University, 6200 MD Maastricht, The Netherlands
- European Graduate School of Neuroscience (EURON), 6200 MD Maastricht, The Netherlands
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24
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Kazanis I. Neurogenesis in the adult mammalian brain: how much do we need, how much do we have? Curr Top Behav Neurosci 2013; 15:3-29. [PMID: 22976273 DOI: 10.1007/7854_2012_227] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The last two decades cytogenic processes (both neurogenic and gliogenic) driven by neural stem cells surviving within the adult mammalian brain have been extensively investigated. It is now well established that within at least two cytogenic niches, the subependymal zone of the lateral ventricles and the subgranular zone in the dentate gyrus, new neurons are born everyday with a fraction of them being finally incorporated into established neuronal networks in the olfactory bulb and the hippocampus, respectively. But how significant is adult neurogenesis in the context of the mature brain and what are the possibilities that these niches can contribute significantly in tissue repair after degenerative insults, or in the restoration of normal hippocampal function in the context of mental and cognitive disorders? Here, we summarise the available data on the normal behaviour of adult neural stem cells in the young and the aged brain and on their response to degeneration. Focus will be given, whenever possible, to numbers: how many stem cells survive in the adult brain, how many cells they can generate and at what ratios do they produce neurons and glia?
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Affiliation(s)
- Ilias Kazanis
- MRC Cambridge Centre for Stem cell Biology and Regenerative Medicine and Department of Veterinary Medicine, University of Cambridge, Madingley Road, CB3 0ES, Cambridge, UK,
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25
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Toledano A, Alvarez MI, Monleón E, Toledano-Díaz A, Badiola JJ, Monzón M. Changes induced by natural scrapie in the calretinin-immunopositive cells and fibres of the sheep cerebellar cortex. THE CEREBELLUM 2012; 11:593-604. [PMID: 22116659 DOI: 10.1007/s12311-011-0335-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Calretinin (CR)-immunopositive cells and fibres in the cerebellar cortex (vermal archicerebellum and neocerebellum) of scrapie-affected, ARQ/ARQ, Rasa Aragonesa breed sheep were studied in comparison with healthy, young and aged, ARQ/ARQ, Rasa Aragonesa animals and with Manchega breed sheep. The scrapie-affected sheep showed signs of both cellular involution and hypertrophic/hyperimmunoreactive responses in all neuronal subtypes; the distribution of the neuronal subtypes in the archi- and neocerebellum, however, did not change compared with controls. The results suggest that the different CR expression and/or CR content of cerebellar cortical neurons in scrapie-affected sheep are more related to their specific functions than any neuroprotective response. The reduction in the cell density of some CR-immunopositive neuronal subsets (i.e. unipolar brush cells) is contradictory to the supposed neuroprotective role of the calcium binding protein CR. However, the hyperimmunoreactivity of many CR-immunopositive neuronal subsets (e.g. the Purkinje cells) suggests the involvement of an over-expression of CR (transitory or restricted to selected neurons) as an adaptative mechanism to fight against the neurodegeneration caused by this prion disease. The changes in the number of immunopositive cells and the hypertrophic/hyperimmunoreactive response seen in scrapie-affected and aged sheep suggests that some different and some similar mechanisms are at work in this disease and aging.
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Alterations in the cholinergic system after frontal cortical infarction in rat brain: pharmacological magnetic resonance imaging of muscarinic receptor responsiveness and stereological analysis of cholinergic forebrain neurons. Neurobiol Dis 2011; 43:625-34. [PMID: 21640824 DOI: 10.1016/j.nbd.2011.05.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 05/05/2011] [Accepted: 05/14/2011] [Indexed: 11/22/2022] Open
Abstract
Vascular cognitive impairment has been related to dysfunction of the central cholinergic system. Studies exploring the putative relationship between vascular cognitive impairment and cholinergic dysfunction have largely been aimed at symptomatic cholinergic treatment rather than focusing on etiological and pathological factors. The present study characterizes chronic responses of the cholinergic system to focal cerebral infarction. Two separate experiments investigated changes in receptor responsiveness versus changes in cell number after photothrombotic infarction of the frontal cortex in rat brain. First, we conducted pharmacological magnetic resonance imaging (phMRI) together with pilocarpine injection to assess relative cerebral blood volume (CBV) responses related to cholinergic muscarinic receptor activation. PhMRI was conducted at 1 and 3 weeks after photothrombotic infarction of either the left or right frontal cortex. Second, stereological assessment was performed on choline acetyltransferase (ChAT)-immunostained sections to determine cholinergic cell body count in several basal forebrain nuclei at 4 weeks after infarction. Significant reductions in relative CBV responses were observed both inside the ischemic area at 1 and 3 weeks, and in areas distant from the lesion at 3 weeks after right-sided frontal cortical infarction. In contrast, cholinergic cell number remained unchanged. These results demonstrate that cholinergic receptor responsiveness may be significantly altered following cerebral infarction, while projecting cholinergic cells are preserved.
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