1
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Li KT, Ji D, Zhou C. Memory rescue and learning in synaptic impaired neuronal circuits. iScience 2023; 26:106931. [PMID: 37534172 PMCID: PMC10391582 DOI: 10.1016/j.isci.2023.106931] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 04/05/2023] [Accepted: 05/16/2023] [Indexed: 08/04/2023] Open
Abstract
Neuronal impairment is a characteristic of Alzheimer's disease (AD), but its effect on neural activity dynamics underlying memory deficits is unclear. Here, we studied the effects of synaptic impairment on neural activities associated with memory recall, memory rescue, and learning a new memory, in an integrate-and-fire neuronal network. Our results showed that reducing connectivity decreases the neuronal synchronization of memory neurons and impairs memory recall performance. Although, slow-gamma stimulation rescued memory recall and slow-gamma oscillations, the rescue caused a side effect of activating mixed memories. During the learning of a new memory, reducing connectivity caused impairment in storing the new memory, but did not affect previously stored memories. We also explored the effects of other types of impairments including neuronal loss and excitation-inhibition imbalance and the rescue by general increase of excitability. Our results reveal potential computational mechanisms underlying the memory deficits caused by impairment in AD.
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Affiliation(s)
- Kwan Tung Li
- Department of Physics, Centre for Nonlinear Studies, Beijing–Hong Kong–Singapore Joint Centre for Nonlinear and Complex Systems (Hong Kong), Institute of Computational and Theoretical Studies, Hong Kong Baptist University, Hong Kong, China
- Research Center for Augmented Intelligence, Research Institute of Artificial Intelligence, Zhejiang Lab, Hangzhou 311100, China
| | - Daoyun Ji
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Changsong Zhou
- Department of Physics, Centre for Nonlinear Studies, Beijing–Hong Kong–Singapore Joint Centre for Nonlinear and Complex Systems (Hong Kong), Institute of Computational and Theoretical Studies, Hong Kong Baptist University, Hong Kong, China
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2
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Liu Y, Zeng Z, Huang S, Shang P, Lv Z, Wang Y, Luo J, Chen J, Shi J, Huang Q, Xie H, Chen Z. Brain Activation During Working Memory Task in Amnestic Mild Cognitive Impairment Patients and Its Association with Memory and Attention. J Alzheimers Dis 2023; 91:863-875. [PMID: 36502326 DOI: 10.3233/jad-220815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Amnestic mild cognitive impairment (aMCI) is regarded as a transitional state of Alzheimer's disease, with working memory (WM) impairment. OBJECTIVE To investigate the brain activity in aMCI patients during WM tasks with the functional near-infrared spectroscopy (fNIRS) technique, as well as explore the association between brain activity and cognitive function in multiple domains. METHODS This study is a case-control study of 54 aMCI patients and 33 cognitively healthy elderly (NC). All participants underwent neuropsychological assessments. fNIRS was applied to examine the brain activation during the WM task. Multivariable linear regression analysis was applied to evaluate associations between brain activation and cognitive function in multiple domains. RESULTS Compared to NC subjects, aMCI patients had lower activation in the bilateral prefrontal, parietal, and occipital cortex during the WM task. Additionally, activation in the left prefrontal, bilateral parietal, and occipital cortex during the encoding and maintenance phase was positively associated with memory function. During memory retrieval, higher activity in the left prefrontal, parietal, and occipital cortex were correlated with higher memory scores. Besides, a positive association also formed between attention function and the activation in the left prefrontal, parietal, and occipital cortex during the WM task. CONCLUSION These findings demonstrated that reduced activation in the prefrontal, parietal and occipital cortex during WM might reflect the risk of cognitive impairment, especially memory and attention function in aMCI patients. Given the brain activation visualization, fNIRS may be a convenient and alternative tool for screening the risk of Alzheimer's disease.
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Affiliation(s)
- Yajing Liu
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Department of Neurology, First People's Hospital of Foshan, Foshan, Guangdong, China
| | - Zhenhua Zeng
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Shuyun Huang
- Department of Neurology, First People's Hospital of Foshan, Foshan, Guangdong, China
| | - Pan Shang
- Department of Neurology, First People's Hospital of Foshan, Foshan, Guangdong, China
| | - Zeping Lv
- National Research Center for Rehabilitation Technical Aids, Rehabilitation Hospital, Beijing, China
| | - Yukai Wang
- Department of Neurology, First People's Hospital of Foshan, Foshan, Guangdong, China
| | - Jiali Luo
- Department of Neurology, First People's Hospital of Foshan, Foshan, Guangdong, China
| | - Jinjuan Chen
- Department of Neurology, First People's Hospital of Foshan, Foshan, Guangdong, China
| | - Jian Shi
- Department of Neurology, The First Affiliated Hospital of Henan University of Science and Technology, Luoyang, China
| | - Qiaobing Huang
- Guangdong Provincial Key Laboratory of Shock and Microcirculation, School of Basic Medical Sciences, Southern Medical University, Baiyun District, Guangzhou, Guangdong, China
| | - Haiqun Xie
- Department of Neurology, First People's Hospital of Foshan, Foshan, Guangdong, China
| | - Zhongqing Chen
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
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3
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Grünblatt E, Homolak J, Babic Perhoc A, Davor V, Knezovic A, Osmanovic Barilar J, Riederer P, Walitza S, Tackenberg C, Salkovic-Petrisic M. From attention-deficit hyperactivity disorder to sporadic Alzheimer's disease-Wnt/mTOR pathways hypothesis. Front Neurosci 2023; 17:1104985. [PMID: 36875654 PMCID: PMC9978448 DOI: 10.3389/fnins.2023.1104985] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 01/31/2023] [Indexed: 02/18/2023] Open
Abstract
Alzheimer's disease (AD) is the most common neurodegenerative disorder with the majority of patients classified as sporadic AD (sAD), in which etiopathogenesis remains unresolved. Though sAD is argued to be a polygenic disorder, apolipoprotein E (APOE) ε4, was found three decades ago to pose the strongest genetic risk for sAD. Currently, the only clinically approved disease-modifying drugs for AD are aducanumab (Aduhelm) and lecanemab (Leqembi). All other AD treatment options are purely symptomatic with modest benefits. Similarly, attention-deficit hyperactivity disorder (ADHD), is one of the most common neurodevelopmental mental disorders in children and adolescents, acknowledged to persist in adulthood in over 60% of the patients. Moreover, for ADHD whose etiopathogenesis is not completely understood, a large proportion of patients respond well to treatment (first-line psychostimulants, e.g., methylphenidate/MPH), however, no disease-modifying therapy exists. Interestingly, cognitive impairments, executive, and memory deficits seem to be common in ADHD, but also in early stages of mild cognitive impairment (MCI), and dementia, including sAD. Therefore, one of many hypotheses is that ADHD and sAD might have similar origins or that they intercalate with one another, as shown recently that ADHD may be considered a risk factor for sAD. Intriguingly, several overlaps have been shown between the two disorders, e.g., inflammatory activation, oxidative stress, glucose and insulin pathways, wingless-INT/mammalian target of rapamycin (Wnt/mTOR) signaling, and altered lipid metabolism. Indeed, Wnt/mTOR activities were found to be modified by MPH in several ADHD studies. Wnt/mTOR was also found to play a role in sAD and in animal models of the disorder. Moreover, MPH treatment in the MCI phase was shown to be successful for apathy including some improvement in cognition, according to a recent meta-analysis. In several AD animal models, ADHD-like behavioral phenotypes have been observed indicating a possible interconnection between ADHD and AD. In this concept paper, we will discuss the various evidence in human and animal models supporting the hypothesis in which ADHD might increase the risk for sAD, with common involvement of the Wnt/mTOR-pathway leading to lifespan alteration at the neuronal levels.
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Affiliation(s)
- Edna Grünblatt
- Department of Child and Adolescent Psychiatry and Psychotherapy, Psychiatric University Hospital Zurich (PUK), University of Zurich, Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and the Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland.,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Jan Homolak
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Ana Babic Perhoc
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Virag Davor
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Ana Knezovic
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Jelena Osmanovic Barilar
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Peter Riederer
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital Würzburg, Würzburg, Germany.,Department and Research Unit of Psychiatry, Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Susanne Walitza
- Department of Child and Adolescent Psychiatry and Psychotherapy, Psychiatric University Hospital Zurich (PUK), University of Zurich, Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and the Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland.,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Christian Tackenberg
- Neuroscience Center Zurich, University of Zurich and the Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland.,Institute for Regenerative Medicine (IREM), University of Zurich, Schlieren, Switzerland
| | - Melita Salkovic-Petrisic
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
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Tichko P, Kim JC, Large E, Loui P. Integrating music-based interventions with Gamma-frequency stimulation: Implications for healthy ageing. Eur J Neurosci 2022; 55:3303-3323. [PMID: 33236353 PMCID: PMC9899516 DOI: 10.1111/ejn.15059] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 11/18/2020] [Accepted: 11/18/2020] [Indexed: 02/07/2023]
Abstract
In recent years, music-based interventions (MBIs) have risen in popularity as a non-invasive, sustainable form of care for treating dementia-related disorders, such as Mild Cognitive Impairment (MCI) and Alzheimer's disease (AD). Despite their clinical potential, evidence regarding the efficacy of MBIs on patient outcomes is mixed. Recently, a line of related research has begun to investigate the clinical impact of non-invasive Gamma-frequency (e.g., 40 Hz) sensory stimulation on dementia. Current work, using non-human-animal models of AD, suggests that non-invasive Gamma-frequency stimulation can remediate multiple pathophysiologies of dementia at the molecular, cellular and neural-systems scales, and, importantly, improve cognitive functioning. These findings suggest that the efficacy of MBIs could, in theory, be enhanced by incorporating Gamma-frequency stimulation into current MBI protocols. In the current review, we propose a novel clinical framework for non-invasively treating dementia-related disorders that combines previous MBIs with current approaches employing Gamma-frequency sensory stimulation. We theorize that combining MBIs with Gamma-frequency stimulation could increase the therapeutic power of MBIs by simultaneously targeting multiple biomarkers of dementia, restoring neural activity that underlies learning and memory (e.g., Gamma-frequency neural activity, Theta-Gamma coupling), and actively engaging auditory and reward networks in the brain to promote behavioural change.
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Affiliation(s)
- Parker Tichko
- Department of Music, Northeastern University, Boston, MA, USA
| | - Ji Chul Kim
- Perception, Action, Cognition (PAC) Division, Department of Psychological Sciences, University of Connecticut, Storrs, CT, USA
| | - Edward Large
- Perception, Action, Cognition (PAC) Division, Department of Psychological Sciences, University of Connecticut, Storrs, CT, USA,Center for the Ecological Study of Perception & Action (CESPA), Department of Psychological Sciences, University of Connecticut, Storrs, CT, USA,Department of Physics, University of Connecticut, Storrs, CT, USA
| | - Psyche Loui
- Department of Music, Northeastern University, Boston, MA, USA
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5
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Li B, Zhang M, Jang I, Ye G, Zhou L, He G, Lin X, Meng H, Huang X, Hai W, Chen S, Li B, Liu J. Amyloid-Beta Influences Memory via Functional Connectivity During Memory Retrieval in Alzheimer's Disease. Front Aging Neurosci 2021; 13:721171. [PMID: 34539382 PMCID: PMC8444623 DOI: 10.3389/fnagi.2021.721171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 08/05/2021] [Indexed: 11/24/2022] Open
Abstract
Objective: Amnesia in Alzheimer's disease (AD) appears early and could be caused by encoding deficiency, consolidation dysfunction, and/or impairment in the retrieval of stored memory information. The relationship between AD pathology biomarker β-amyloid and memory dysfunction is unclear. Method: The memory task functional MRI and amyloid PET were simultaneously performed to investigate the relationship between memory performance, memory phase-related functional connectivity, and cortical β-amyloid deposition. We clustered functional networks during memory maintenance and compared network connectivity between groups in each memory phase. Mediation analysis was performed to investigate the mediator between β-amyloid and related cognitive performance. Results: Alzheimer's disease was primarily characterized by decreased functional connectivity in a data-driven network composed of an a priori default mode network, limbic network, and frontoparietal network during the memory maintenance (0.205 vs. 0.236, p = 0.04) and retrieval phase (0.159 vs. 0.183, p = 0.017). Within the network, AD had more regions with reduced connectivity during the retrieval than the maintenance and encoding phases (chi-square p = 0.01 and < 0.001). Furthermore, the global cortical β-amyloid negatively correlated with network connectivity during the memory retrieval phase (R = - 0.247, p = 0.032), with this relationship mediating the effect of cortical β-amyloid on memory performance (average causal mediation effect = - 0.05, p = 0.035). Conclusion: We demonstrated that AD had decreased connectivity in specific networks during the memory retrieval phase. Impaired functional connectivity during memory retrieval mediated the adverse effect of β-amyloid on memory. These findings help to elucidate the involvement of cortical β-amyloid (Aβ) in the memory performance in the early stages of AD.
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Affiliation(s)
- Binyin Li
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Miao Zhang
- Department of Nuclear Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ikbeom Jang
- MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, MA, United States
- Department of Radiology, Harvard Medical School, Boston, MA, United States
| | - Guanyu Ye
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Liche Zhou
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Guiying He
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaozhu Lin
- Department of Nuclear Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hongping Meng
- Department of Nuclear Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xinyun Huang
- Department of Nuclear Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wangxi Hai
- Department of Nuclear Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shengdi Chen
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Biao Li
- Department of Nuclear Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Collaborative Innovation Center for Molecular Imaging of Precision Medicine, Ruijin Center, Shanghai, China
| | - Jun Liu
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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6
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Ho HT, Guo NW, Pai MC. The application of a neuropsychological measure of executive working memory in older adults with memory impairment. APPLIED NEUROPSYCHOLOGY-ADULT 2021; 29:1605-1614. [PMID: 33794709 DOI: 10.1080/23279095.2021.1901707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The component of working memory that the frontal cortex subserves is frequently characterized as the executive working memory (EWM). This study applied a neuropsychological measure of EWM (NPM-EWM) in older adults with memory impairment to investigate the EWM. Thirty-two older adults from the community were recruited as older healthy controls (OHCs), and 58 older adults from a memory clinic were diagnosed with mild cognitive impairment (MCI) and mild dementia (MD). Significant differences were found among the three groups in the Clinical Dementia Rating (CDR), the Chinese version of Mini-Mental State Examination (MMSE-C), and the Cognitive Abilities Screening Instrument (CASI). The NPM-EWM was applied by using the learning task of the Comprehensive Nonverbal Memory Test Battery, where the 7 scores were divided into two categories: mnemonic capacity and executive error. All OHCs, more than 50% MCI, and less than 25% of MD patients passed the NPM-EWM. The MCI-passed and MD-passed subgroups showed similar mnemonic capacity and executive errors, and both the subgroups had significantly worse performance than the OHC group. The MD-passed subgroup had a higher Hamilton Depression Rating Scale (HDRS) score than did the MD-failed subgroup. The MCI-failed subgroup had a higher Hierarchy of Care Required (HCR) level in instrumental activities of daily living (IADL) than did the MCI-passed subgroup. These findings indicated that applying the NPM-EWM for older adults with memory impairment may offer precise and tailored care to a whole person, especially for the MCI patients with poorer EWM and the MD patients with relatively intact EWM.
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Affiliation(s)
- Hsiao-Ting Ho
- Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Nai-Wen Guo
- Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Institute of Behavioral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Ming-Chyi Pai
- Division of Behavioral Neurology, Department of Neurology, National Cheng Kung University Hospital, Tainan, Taiwan.,Institute of Gerontology, College of Medicine, National Cheng Kung University, Tainan City, Taiwan
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7
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Elmorsy E, Elsharkawy E, Alhumaydhi FA, Salama M. The protective effect of Indian Catechu methanolic extract against aluminum chloride-induced neurotoxicity, A rodent model of Alzheimer's disease. Heliyon 2021; 7:e06269. [PMID: 33665436 PMCID: PMC7898000 DOI: 10.1016/j.heliyon.2021.e06269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 01/26/2021] [Accepted: 02/10/2021] [Indexed: 11/21/2022] Open
Abstract
Alzheimer's disease (AD) is the commonest neurodegenerative disorder with a wide array of manifestations, courses, and contributing causes. Despite being clinically characterized a long time ago; no treatment has been developed that could improve the pathology or slow down the disease manifestation- so far. Indian Catechu methanolic extract (ICME) has proved to have multiple beneficial effects that support its use in several disorders- especially those with complex etiology. In the present study, we evaluated the neuroprotective effect of ICME in a rat model of AD using Aluminum Chloride (AlCl3). The results showed that ICME could have a positive impact on the course of AD through its anticholinesterase effect and significant antioxidant effect which was reflected on the animals both on behavioral tests as well as hallmark pathological findings.
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Affiliation(s)
- Ekramy Elmorsy
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Mansoura University, Egypt
- Pathology Department, Faculty of Medicine, Northern Border University-ARAR, North Region, Saudi Arabia
| | - Eman Elsharkawy
- Department of Eco Physiology, Ecology and Range Management Division, Desert Research Center, Mathef El-Mataria, 15753 Egypt
- Department of Chemistry, Science Faculty for Girls, Northern Border University-ARAR, North Region, Saudi Arabia
| | - Fahad A. Alhumaydhi
- Department of Medical Laboratories, College of Applied Medical Sciences, Qassim University, Buraydah 52571, Saudi Arabia
| | - Mohamed Salama
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Mansoura University, Egypt
- Institute of Global Health and Human Ecology, The American University in Cairo (AUC), Cairo 11385, Egypt
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8
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Paitel ER, Samii MR, Nielson KA. A systematic review of cognitive event-related potentials in mild cognitive impairment and Alzheimer's disease. Behav Brain Res 2020; 396:112904. [PMID: 32941881 DOI: 10.1016/j.bbr.2020.112904] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 08/29/2020] [Accepted: 09/05/2020] [Indexed: 01/28/2023]
Abstract
This systematic review examined whether event-related potentials (ERPs) during higher cognitive processing can detect subtle, early signs of neurodegenerative disease. Original, empirical studies retrieved from PsycINFO and PubMed were reviewed if they analyzed patterns in cognitive ERPs (≥150 ms post-stimulus) differentiating mild cognitive impairment (MCI), Alzheimer's disease (AD), or cognitively intact elders who carry AD risk through the Apolipoprotein-E ε4 allele (ε4+) from healthy older adult controls (HC). The 100 studies meeting inclusion criteria (MCI = 47; AD = 47; ε4+ = 6) analyzed N200, P300, N400, and occasionally, later components. While there was variability across studies, patterns of reduced amplitude and delayed latency were apparent in pathological aging, consistent with AD-related brain atrophy and cognitive impairment. These effects were particularly evident in advanced disease progression (i.e., AD > MCI) and in later ERP components measured during complex tasks. Although ERP studies in intact ε4+ elders are thus far scarce, a similar pattern of delayed latency was notable, along with a contrasting pattern of increased amplitude, consistent with compensatory neural activation. This limited work suggests ERPs might be able to index early neural changes indicative of future cognitive decline in otherwise healthy elders. As ERPs are also accessible and affordable relative to other neuroimaging methods, their addition to cognitive assessment might substantively enhance early identification and characterization of neural dysfunction, allowing opportunity for earlier differential diagnosis and targeting of intervention. To evaluate this possibility there is urgent need for well-powered studies assessing late cognitive ERPs during complex tasks, particularly in healthy elders at risk for cognitive decline.
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Affiliation(s)
| | | | - Kristy A Nielson
- Marquette University, Department of Psychology, United States; Medical College of Wisconsin, Department of Neurology and the Center for Imaging Research, United States.
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9
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Theobromine Improves Working Memory by Activating the CaMKII/CREB/BDNF Pathway in Rats. Nutrients 2019; 11:nu11040888. [PMID: 31010016 PMCID: PMC6520707 DOI: 10.3390/nu11040888] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 04/05/2019] [Accepted: 04/17/2019] [Indexed: 01/08/2023] Open
Abstract
Theobromine (TB) is a primary methylxanthine found in cacao beans. cAMP-response element-binding protein (CREB) is a transcription factor, which is involved in different brain processes that bring about cellular changes in response to discrete sets of instructions, including the induction of brain-derived neurotropic factor (BDNF). Ca2+/calmodulin-dependent protein kinase II (CaMKII) has been strongly implicated in the memory formation of different species as a key regulator of gene expression. Here we investigated whether TB acts on the CaMKII/CREB/BDNF pathway in a way that might improve the cognitive and learning function in rats. Male Wistar rats (5 weeks old) were divided into two groups. For 73 days, the control rats (CN rats) were fed a normal diet, while the TB-fed rats (TB rats) received the same food, but with a 0.05% TB supplement. To assess the effects of TB on cognitive and learning ability in rats: The radial arm maze task, novel object recognition test, and Y-maze test were used. Then, the brain was removed and the medial prefrontal cortex (mPFC) was isolated for Western Blot, real-time PCR and enzyme-linked immunosorbent assay. Phosphorylated CaMKII (p-CaMKII), phosphorylated CREB (p-CREB), and BDNF level in the mPFC were measured. In all the behavior tests, working memory seemed to be improved by TB ingestion. In addition, p-CaMKII and p-CREB levels were significantly elevated in the mPFC of TB rats in comparison to those of CN rats. We also found that cortical BDNF protein and mRNA levels in TB rats were significantly greater than those in CN rats. These results suggest that orally supplemented TB upregulates the CaMKII/CREB/BDNF pathway in the mPFC, which may then improve working memory in rats.
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10
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Shrivastava SK, Sinha SK, Srivastava P, Tripathi PN, Sharma P, Tripathi MK, Tripathi A, Choubey PK, Waiker DK, Aggarwal LM, Dixit M, Kheruka SC, Gambhir S, Shankar S, Srivastava RK. Design and development of novel p-aminobenzoic acid derivatives as potential cholinesterase inhibitors for the treatment of Alzheimer's disease. Bioorg Chem 2018; 82:211-223. [PMID: 30326403 DOI: 10.1016/j.bioorg.2018.10.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 10/02/2018] [Accepted: 10/04/2018] [Indexed: 12/11/2022]
Abstract
Based on the quantitative structure-activity relationship (QSAR), some novel p-aminobenzoic acid derivatives as promising cholinesterase enzyme inhibitors were designed, synthesized, characterized and evaluated to enhance learning and memory. The in vitro enzyme kinetic study of the synthesized compounds revealed the type of inhibition on the respective acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) enzymes. The in vivo studies of the synthesized compounds exhibited significant reversal of cognitive deficits in the animal models of amnesia as compared to standard drug donepezil. Further, the ex vivo studies in the specific brain regions like the hippocampus, hypothalamus, and prefrontal cortex regions also exhibited AChE inhibition comparable to standard donepezil. The in silico molecular docking and dynamics simulations studies of the most potent compound 22 revealed the consensual interactions at the active site pocket of the AChE.
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Affiliation(s)
- Sushant K Shrivastava
- Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, U.P., India.
| | - Saurabh K Sinha
- Department of Pharmaceutical Sciences, Mohanlal Sukhadia University, Udaipur 313001, Rajasthan, India
| | - Pavan Srivastava
- Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, U.P., India
| | - Prabhash N Tripathi
- Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, U.P., India
| | - Piyoosh Sharma
- Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, U.P., India
| | - Manish K Tripathi
- Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, U.P., India
| | - Avanish Tripathi
- Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, U.P., India
| | - Priyanka K Choubey
- Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, U.P., India
| | - Digambar K Waiker
- Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, U.P., India
| | - Lalit M Aggarwal
- Department of Radiotherapy & Radiation Medicine, Institute of Medical Sciences, Banaras Hindu University, Varanasi, UP 221 005, India
| | - Manish Dixit
- Department of Nuclear Medicine, SGPGIMS, Raebareli Road, Lucknow 226014, UP, India
| | - Subhash C Kheruka
- Department of Nuclear Medicine, SGPGIMS, Raebareli Road, Lucknow 226014, UP, India
| | - Sanjay Gambhir
- Department of Nuclear Medicine, SGPGIMS, Raebareli Road, Lucknow 226014, UP, India
| | - Sharmila Shankar
- Department of Genetics, Louisiana State University Health Sciences Center, 1700 Tulane Avenue, New Orleans, LA 70112, USA
| | - Rakesh K Srivastava
- Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, 1700 Tulane Avenue, New Orleans, LA 70112, USA
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11
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Eun-Sun J, Jun-Hwan L, Hyun-Tae K, Sang-Soo P, Ji-Eun K, Ji-Yoon C, In-Chan S, Young-Eun C, Yoo HR. Effect of acupuncture on patients with mild cognitive impairment assessed using functional near-infrared spectroscopy on week 12 (close-out): a pilot study protocol. Integr Med Res 2018; 7:287-295. [PMID: 30271718 PMCID: PMC6160507 DOI: 10.1016/j.imr.2018.06.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 06/10/2018] [Accepted: 06/12/2018] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Currently, there is no clearly established therapy to treat mild cognitive impairment (MCI); consequently, alternative therapies, such as acupuncture, have been attempted. In many clinical studies, the potential benefits of acupuncture for cognitive improvement have been identified in clinical outcomes; however, the mechanism remains unclear. Accordingly, this study aims to investigate the therapeutic mechanism of acupuncture therapy using functional near-infrared spectroscopy and its feasibility in treating individuals with impaired cognitive function. METHODS This study is designed to be a prospective, two-arm, parallel clinical trial involving 24 participants. The patient group will be treated with acupuncture twice per week for 12 weeks; meanwhile, the healthy control group will not undergo acupuncture treatment. Functional near-infrared spectroscopy assessment and a working memory test will be performed at baseline and every 6 weeks to investigate the therapeutic mechanism of acupuncture. The primary outcome will be measured using the Korean version of the Montreal Cognitive Assessment. The secondary outcomes will be the Alzheimer's Disease Assessment Scale-cognitive subscale score, working memory task accuracy, response rate, response time, and hemodynamic response of the prefrontal lobe. The outcomes will be evaluated at baseline, and at 6 and 12 weeks after subject allocation. DISCUSSION This clinical pilot trial is designed to determine the feasibility of acupuncture as an effective and safe treatment for improving cognitive function in patients with MCI. Results of this study may provide guidance for future larger-scale clinical trials. TRIAL REGISTRATION Clinical Research Information Service (CRIS), Republic of Korea: KCT0002451. Registered September 5, 2017.
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Affiliation(s)
- Jung Eun-Sun
- Department of Internal Korean Medicine, Dunsan Korean Medicine Hospital of Daejeon University, Daejeon, Korea
| | - Lee Jun-Hwan
- Clinical Research Division, Korean Institute of Oriental Medicine, Daejeon, Korea
| | - Kim Hyun-Tae
- Department of Internal Korean Medicine, Dunsan Korean Medicine Hospital of Daejeon University, Daejeon, Korea
| | - Park Sang-Soo
- Department of Internal Korean Medicine, Dunsan Korean Medicine Hospital of Daejeon University, Daejeon, Korea
| | - Kim Ji-Eun
- Clinical Research Division, Korean Institute of Oriental Medicine, Daejeon, Korea
| | - Cha Ji-Yoon
- Department of Internal Korean Medicine, Dunsan Korean Medicine Hospital of Daejeon University, Daejeon, Korea
| | - Seol In-Chan
- Department of Internal Korean Medicine, Dunsan Korean Medicine Hospital of Daejeon University, Daejeon, Korea
| | - Choi Young-Eun
- Clinical Research Division, Korean Institute of Oriental Medicine, Daejeon, Korea
| | - Ho-Ryong Yoo
- Department of Internal Korean Medicine, Dunsan Korean Medicine Hospital of Daejeon University, Daejeon, Korea
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12
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Singh NA, Bhardwaj V, Ravi C, Ramesh N, Mandal AKA, Khan ZA. EGCG Nanoparticles Attenuate Aluminum Chloride Induced Neurobehavioral Deficits, Beta Amyloid and Tau Pathology in a Rat Model of Alzheimer's Disease. Front Aging Neurosci 2018; 10:244. [PMID: 30150930 PMCID: PMC6099078 DOI: 10.3389/fnagi.2018.00244] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 07/24/2018] [Indexed: 02/05/2023] Open
Abstract
Rational: Alzheimer's disease (AD) is a neurodegenerative pathology characterized by the presence of neuritic plaques and neurofibrillary tangles. Aluminum has been reported to play an important role in the etiology and pathogenesis of this disease. Hence, the present study aimed to evaluate the neuroprotective role of epigallocatechin-gallate (EGCG) loaded nanoparticles (nanoEGCG) against aluminum chloride (AlCl3) induced neurobehavioral and pathological changes in AD induced rats. Method: 100 mg/kg body weight AlCl3 was administered orally for 60 days, which was followed by 10 mg/kg body weight free EGCG and nanoEGCG treatment for 30 days. Morris water maze, open field and novel object recognition tests were employed for neurobehavioral assessment of the rats. This was followed by histopathological assessment of the cortex and the hippocampus in the rat brain. For further validation biochemical, immunohistochemistry and western blot assays were carried out. Result: Aluminum exposure reduced the exploratory and locomotor activities in open field and significantly reduced the memory and learning curve of rats in Morris water maze and novel object recognition tests. These neurobehavioral impairments were significantly attenuated in nanoEGCG treated rats. Histopathological assessment of the cortex and hippocampus of AlCl3 induced rat brains showed the presence of both neuritic plaques and neurofibrillary tangles. In nanoEGCG treated rats this pathology was absent. Significant increase in biochemical, immunohistochemical and protein levels was noted in AlCl3 induced rats. While these levels were greatly reduced in nanoEGCG treated rats. Conclusion: In conclusion, this study strengthens the hypothesis that EGCG nanoparticles can reverse memory loss, neuritic plaque and neurofibrillary tangles formation.
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Affiliation(s)
- Neha Atulkumar Singh
- Department of Integrative Biology, School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - Vaishali Bhardwaj
- Department of Biotechnology, School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - Chandrika Ravi
- Department of Biotechnology, School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - Nithya Ramesh
- Department of Biotechnology, School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - Abul Kalam Azad Mandal
- Department of Biotechnology, School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - Zaved Ahmed Khan
- University Institute of Biotechnology, Chandigarh University, Mohali, India
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13
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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] [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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14
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The Box Task: A tool to design experiments for assessing visuospatial working memory. Behav Res Methods 2017; 50:1981-1987. [DOI: 10.3758/s13428-017-0966-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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15
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Glausier JR, Roberts RC, Lewis DA. Ultrastructural analysis of parvalbumin synapses in human dorsolateral prefrontal cortex. J Comp Neurol 2017; 525:2075-2089. [PMID: 28074478 PMCID: PMC5397325 DOI: 10.1002/cne.24171] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 12/19/2016] [Accepted: 12/20/2016] [Indexed: 12/11/2022]
Abstract
Coordinated activity of neural circuitry in the primate dorsolateral prefrontal cortex (DLPFC) supports a range of cognitive functions. Altered DLPFC activation is implicated in a number of human psychiatric and neurological illnesses. Proper DLPFC activity is, in part, maintained by two populations of neurons containing the calcium-binding protein parvalbumin (PV): local inhibitory interneurons that form Type II synapses, and long-range glutamatergic inputs from the thalamus that form Type I synapses. Understanding the contributions of each PV neuronal population to human DLPFC function requires a detailed examination of their anatomical properties. Consequently, we performed an electron microscopic analysis of (1) the distribution of PV immunoreactivity within the neuropil, (2) the properties of dendritic shafts of PV-IR interneurons, (3) Type II PV-IR synapses from PV interneurons, and (4) Type I PV-IR synapses from long-range projections, within the superficial and middle laminar zones of the human DLPFC. In both laminar zones, Type II PV-IR synapses from interneurons comprised ∼60% of all PV-IR synapses, and Type I PV-IR synapses from putative thalamocortical terminals comprised the remaining ∼40% of PV-IR synapses. Thus, the present study suggests that innervation from PV-containing thalamic nuclei extends across superficial and middle layers of the human DLPFC. These findings contrast with previous ultrastructural studies in monkey DLPFC where Type I PV-IR synapses were not identified in the superficial laminar zone. The presumptive added modulation of DLPFC circuitry by the thalamus in human may contribute to species-specific, higher-order functions.
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Affiliation(s)
- Jill R. Glausier
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213
| | - Rosalinda C. Roberts
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - David A. Lewis
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213
- Department of Neuroscience, University of Pittsburgh School of Arts and Sciences, Pittsburgh, PA 15213
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16
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Callahan PM, Bertrand D, Bertrand S, Plagenhoef MR, Terry AV. Tropisetron sensitizes α7 containing nicotinic receptors to low levels of acetylcholine in vitro and improves memory-related task performance in young and aged animals. Neuropharmacology 2017; 117:422-433. [PMID: 28259598 DOI: 10.1016/j.neuropharm.2017.02.025] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 02/06/2017] [Accepted: 02/25/2017] [Indexed: 01/02/2023]
Abstract
Tropisetron, a 5-HT3 receptor antagonist commonly prescribed for chemotherapy-induced nausea and vomiting also exhibits high affinity, partial agonist activity at α7 nicotinic acetylcholine receptors (α7 nAChRs). α7 nAChRs are considered viable therapeutic targets for neuropsychiatric disorders such as Alzheimer's disease (AD). Here we further explored the nAChR pharmacology of tropisetron to include the homomeric α7 nAChR and recently characterized heteromeric α7β2 nAChR (1:10 ratio) and we evaluated its cognitive effects in young and aged animals. Electrophysiological studies on human nAChRs expressed in Xenopus oocytes confirmed the partial agonist activity of tropisetron at α7 nAChRs (EC50 ∼2.4 μM) with a similar effect at α7β2 nAChRs (EC50 ∼1.5 μM). Moreover, currents evoked by irregular pulses of acetylcholine (40 μM) at α7 and α7β2 nAChRs were enhanced during sustained exposure to low concentrations of tropisetron (10 and 30 nM) indicative of a "priming" or co-agonist effect. Tropisetron (0.1-10 mg/kg) improved novel object recognition performance in young Sprague-Dawley rats and in aged Fischer rats. In aged male and female rhesus monkeys, tropisetron (0.03-1 mg/kg) produced a 17% increase from baseline levels in delayed match to sample long delay accuracy while combination of non-effective doses of donepezil (0.1 mg/kg) and tropisetron (0.03 and 0.1 mg/kg) produced a 24% change in accuracy. Collectively, these animal experiments indicate that tropisetron enhances cognition and has the ability to improve the effective dose range of currently prescribed AD therapy (donepezil). Moreover, these effects may be explained by tropisetron's ability to sensitize α7 containing nAChRs to low levels of acetylcholine.
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Affiliation(s)
- Patrick M Callahan
- Department of Pharmacology and Toxicology, Augusta University, Augusta, GA 30912, United States.
| | - Daniel Bertrand
- HiQScreen Sàrl, 6, rte de Compois, 1222 Vésenaz, Geneva, Switzerland
| | - Sonia Bertrand
- HiQScreen Sàrl, 6, rte de Compois, 1222 Vésenaz, Geneva, Switzerland
| | - Marc R Plagenhoef
- Department of Pharmacology and Toxicology, Augusta University, Augusta, GA 30912, United States
| | - Alvin V Terry
- Department of Pharmacology and Toxicology, Augusta University, Augusta, GA 30912, United States
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17
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Li BY, Tang HD, Chen SD. Retrieval Deficiency in Brain Activity of Working Memory in Amnesic Mild Cognitive Impairment Patients: A Brain Event-Related Potentials Study. Front Aging Neurosci 2016; 8:54. [PMID: 27047371 PMCID: PMC4803731 DOI: 10.3389/fnagi.2016.00054] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 03/07/2016] [Indexed: 11/19/2022] Open
Abstract
In the early stage of Alzheimer disease (AD) or mild cognitive impairment (MCI), working memory (WM) deficiency is prominent and could be attributed to failure in encoding, maintenance or retrieval of information. However, evidence for a retention or retrieval deficit remains equivocal. It is also unclear what cognitive mechanism in WM is impaired in MCI or early AD. We enrolled 46 subjects from our Memory Clinics and community, with 24 amnesic MCI patients and 22 normal subjects. After neurological and cognitive assessments, they performed a classic delayed match to sample (DMS) task with simultaneous event-related potential (ERP) recorded. The ERPs in encoding and retrieval epoch during WM were analyzed separately. The latency and amplitude of every ERP component were compared between two groups, and then analyzed to explore their relationship with neuropsychological performance. Finally, the locations of maximal difference in cortex were calculated by standard low-resolution tomographic analysis. A total of five components were found: P1, N1, P2, N2, and P300. The amplitude of P2 and P300 was larger in normal subjects than in MCI patients only during retrieval, not encoding epoch, while the latency did not show statistical difference. The latency and amplitude of P1 and N1 were similar in two groups. P2 amplitude in the retrieval epoch positively correlated with memory test (auditory verbal learning test) and visual spatial score of Chinese Addenbrooke's Cognitive Examination-Revised (ACE-R), while P300 amplitude correlated with ACE-R. The activation difference in P2 time range was maximal at medial frontal gyrus. However, the difference in cortex activation during P300 time range did not show significance. The amplitude of P2 indicated deficiency in memory retrieval process, potentially due to dysfunction of central executive in WM model. Regarding the location of P2 during WM task, medial frontal plays important role in memory retrieval. The findings in the present study suggested that MCI patients have retrieval deficit, probably due to central executive based on medial frontal gyrus. Thus, it may provide new biomarker for early detection and intervention for aMCI.
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Affiliation(s)
- Bin-Yin Li
- Department of Neurology and Collaborative Innovation Center for Brain Science, Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai, China
| | - Hui-Dong Tang
- Department of Neurology and Collaborative Innovation Center for Brain Science, Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai, China
| | - Sheng-Di Chen
- Department of Neurology and Collaborative Innovation Center for Brain Science, Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai, China; Laboratory of Neurodegenerative Diseases and Key Laboratory of Stem Cell Biology, Institute of Health Science, Shanghai Institutes for Biological Sciences, Chinese Academy of Science and Shanghai Jiao Tong University School of MedicineShanghai, China
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18
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Jang JS, Lee JS, Yoo DH. Effects of spaced retrieval training with errorless learning in the rehabilitation of patients with dementia. J Phys Ther Sci 2015; 27:2735-8. [PMID: 26504282 PMCID: PMC4616083 DOI: 10.1589/jpts.27.2735] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Accepted: 05/25/2015] [Indexed: 11/24/2022] Open
Abstract
[Purpose] Among the non-pharmacological interventions for dementia, spaced retrieval
training (SRT) is a good method for rehabilitating cognition. The purpose of this study
was to examine effects of SRT with errorless learning (EL) in the rehabilitation of
patients with dementia. [Subjects and Methods] Twenty-nine participants with vascular
dementia (VD) and Alzheimer’s disease (AD) participated in the present study. The Korean
version of the Consortium to Establish a Registry for Alzheimer’s disease (CERAD-K) and
Modified Barthel Index (MBI) were performed to assess the changes in the
neuropsychological performance and the independent activities of daily living after SRT
with EL. All tests were administered both before and after SRT with EL. Each SRT with EL
intervention was performed for 30 minutes per day for 5 weeks. SPSS for Windows version
18.0 was used for statistical analysis. [Results] All items of the CERAD-K score of the VD
group except for constructional praxis increased significantly after the SRT with EL
intervention, but no significant differences from the AD group were found. The Korean
version of the geriatric depression scale (GDS-K) of the VD group increased significantly
after the SRT with EL intervention. The mean MBI scores of each group showed no
significant difference after the intervention. [Conclusion] SRT with EL is an effective
intervention for memory training of patients with dementia. Future research using
sufficient sample sizes will be needed to obtain strong evidence for comparing not only
the before and after intervention data but also between the groups.
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Affiliation(s)
- Jong Sik Jang
- Department of Occupational Therapy, Far East University, Republic of Korea
| | - Jae Shin Lee
- Department of Occupational Therapy, Konyang University, Republic of Korea
| | - Doo Han Yoo
- Department of Occupational Therapy, Konyang University, Republic of Korea
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19
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Chiou KS, Sandry J, Chiaravalloti ND. Cognitive contributions to differences in learning after moderate to severe traumatic brain injury. J Clin Exp Neuropsychol 2015; 37:1074-85. [DOI: 10.1080/13803395.2015.1078293] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Lakshmi BVS, Sudhakar M, Prakash KS. Protective effect of selenium against aluminum chloride-induced Alzheimer's disease: behavioral and biochemical alterations in rats. Biol Trace Elem Res 2015; 165:67-74. [PMID: 25613582 DOI: 10.1007/s12011-015-0229-3] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Accepted: 01/05/2015] [Indexed: 10/24/2022]
Abstract
In present study, selenium was selected for evaluating effect of selenium on aluminum chloride (AlCl3)-induced Alzheimer's disease in rats. Thirty Wistar rats were divided into five groups of six in each. Group I (control) received distilled water, group II-AlCl3 (100 mg/kg, p.o.), group III-selenium (1 mg/kg, p.o.), group IV-AlCl3 + vitamin E (100 mg/kg, p.o. + 100 mg/kg, p.o.), and group V-AlCl3 + selenium (100 mg/kg, p.o. + 1 mg/kg, p.o.) for 21 days. At end of experiment, various behavioral, biochemical, and histopathological assessments were carried out. The animals showed increase in time to reach platform in Morris water maze and decreased step-down latencies in passive avoidance test indicating learning and memory impairment in aluminum chloride-treated group, but administration of selenium decreased time to reach platform in Morris water maze, increased step-down latencies, and strengthened its memory action in drug-treated animals. There was decrease in muscle strength measured by rotarod test indicating motor incoordination and decrease in locomotor activity assessed by actophotometer test in AlCl3 control group, whereas in selenium-AlCl3 group, there was improvement in muscle strength and locomotion. Biochemical analysis of the brain revealed that chronic administration of AlCl3 significantly increased lipid peroxidation and decreased levels of acetyl cholinesterase, catalase, reduced glutathione and glutathione reductase, an index of oxidative stress process. Administration of selenium attenuated lipid peroxidation and ameliorated the biochemical changes. There were marked changes at subcellular level observed by histopathology studies in AlCl3 group, and better improvement in these changes was observed in selenium + AlCl3group. Therefore, this study strengthens the hypothesis that selenium helps to combat oxidative stress produced by accumulation of AlCl3 in the brain and helps in prophylaxis of Alzheimer's diseases.
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Affiliation(s)
- B V S Lakshmi
- Department of Pharmacology, Malla Reddy College of Pharmacy, Dhulapally (via Hakimpet), Maisammaguda, Secunderabad, Andhra Pradesh, 500014, India,
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Behl P, Edwards JD, Kiss A, Lanctot KL, Streiner DL, Black SE, Stuss DT. Treatment effects in multiple cognitive domains in Alzheimer's disease: a two-year cohort study. ALZHEIMERS RESEARCH & THERAPY 2014; 6:48. [PMID: 25484926 PMCID: PMC4255390 DOI: 10.1186/alzrt280] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Accepted: 07/14/2014] [Indexed: 11/10/2022]
Abstract
Introduction Despite widespread use of second-generation cholinesterase inhibitors for the symptomatic treatment of Alzheimer’s disease (AD), little is known about the long term effects of cholinergic treatment on global cognitive function and potential specific effects in different cognitive domains. The objectives of this study were to determine the association between cholinergic treatment and global cognitive function over one and two years in a cohort of patients with mild or moderate AD and identify potential differences in domain-specific cognitive outcomes within this cohort. Methods A cohort of patients meeting the revised National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer's Disease and Related Disorders Association (NINCDS-ADRDA) criteria for mild or moderate AD, including patients both on treatment with a cholinesterase inhibitor and untreated controls (treated = 65, untreated = 65), were recruited from the Cognitive Neurology Clinic at Sunnybrook Health Sciences Centre, as part of the Sunnybrook Dementia Study. Patients were followed for one to two years and underwent standardized neuropsychological assessments to evaluate global and domain-specific cognitive function. Associations between cholinesterase inhibitor use and global and domain-specific cognitive outcome measures at one and two years of follow-up were estimated using mixed model linear regression, adjusting for age, education, and baseline mini mental state examination (MMSE). Results At one year, treated patients showed significantly less decline in global cognitive function, and treatment and time effects across tests of executive and visuospatial function. At two years, there was a significant trend towards less decline in global cognition for treated patients. Moreover, treated patients showed significant treatment and time effects across tests of executive functioning, memory, and visuospatial function. Conclusions The present study offers two important contributions to knowledge of the effectiveness of cholinesterase inhibitor treatment in patients with mild-moderate AD: 1) that second-generation cholinesterase inhibitors demonstrate long-term effectiveness for reducing global cognitive decline over one to two years of follow-up, and 2) that decline in function for cognitive domains, including executive function, memory, and visuospatial skill that are primarily mediated by frontal networks and by the cholinergic system, rather than memory, may be slowed by treatment targeting the cholinergic system.
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Affiliation(s)
- Pearl Behl
- L.C.Campbell Cognitive Neurology Research Unit, Toronto, Canada ; University of Toronto, Toronto, Ontario, Canada
| | - Jodi D Edwards
- L.C.Campbell Cognitive Neurology Research Unit, Toronto, Canada ; Canadian Partnership for Stroke Recovery, Toronto, Ontario, Canada
| | - Alexander Kiss
- Brain Sciences Research Program, Sunnybrook Health Sciences Center, Toronto, Ontario, Canada
| | - Krista L Lanctot
- University of Toronto, Toronto, Ontario, Canada ; Brain Sciences Research Program, Sunnybrook Health Sciences Center, Toronto, Ontario, Canada ; Department of Psychiatry, Toronto, Ontario, Canada
| | - David L Streiner
- Department of Psychiatry & Behavioral Neurosciences, McMaster University, Toronto, Ontario, Canada
| | - Sandra E Black
- L.C.Campbell Cognitive Neurology Research Unit, Toronto, Canada ; University of Toronto, Toronto, Ontario, Canada ; Brain Sciences Research Program, Sunnybrook Health Sciences Center, Toronto, Ontario, Canada ; Department of Medicine (Neurology), Toronto, Ontario, Canada ; Department of Psychology, Toronto, Ontario, Canada
| | - Donald T Stuss
- University of Toronto, Toronto, Ontario, Canada ; Department of Medicine (Neurology), Toronto, Ontario, Canada ; Department of Psychology, Toronto, Ontario, Canada ; Ontario Brain Institute, Toronto, Ontario, Canada
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22
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Klekociuk SZ, Summers MJ. The learning profile of persistent mild cognitive impairment (MCI): a potential diagnostic marker of persistent amnestic MCI. Eur J Neurol 2013; 21:470-7, e23-4. [DOI: 10.1111/ene.12333] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 11/18/2013] [Indexed: 11/26/2022]
Affiliation(s)
- S. Z. Klekociuk
- School of Psychology; University of Tasmania; Launceston TAS Australia
| | - M. J. Summers
- School of Psychology; University of Tasmania; Launceston TAS Australia
- Wicking Dementia Research and Education Centre; School of Medicine; University of Tasmania; Hobart TAS Australia
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23
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Kravitz E, Gaisler-Salomon I, Biegon A. Hippocampal glutamate NMDA receptor loss tracks progression in Alzheimer's disease: quantitative autoradiography in postmortem human brain. PLoS One 2013; 8:e81244. [PMID: 24312282 PMCID: PMC3842934 DOI: 10.1371/journal.pone.0081244] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 10/21/2013] [Indexed: 11/18/2022] Open
Abstract
Early Alzheimer's disease (AD) is characterized by memory loss and hippocampal atrophy with relative sparing of basal ganglia. Activation of glutamate NMDA receptors in the hippocampus is an important step in memory formation. We measured the density of NMDA receptors in samples of hippocampus, entorhinal cortex and basal ganglia obtained from subjects who died with pathologically confirmed AD and age- and sex- matched non-demented controls. We found significant decreases in NMDA receptor density in the hippocampus and entorhinal cortex but not in the basal ganglia. Loss of NMDA receptors was significantly correlated with neuropathological progression as assessed by Braak staging postmortem. The same samples were probed for neuroinflammation by measuring the density and gene expression of translocator protein 18 kDA (TSPO), an established marker of microglial activation. Unlike NMDA receptor loss, increased densities of TSPO were found in all of the brain regions sampled. However hippocampal, but not striatal TSPO density and gene expression were inversely correlated with NMDA receptor density and positively correlated with Braak stage, suggesting NMDA receptors exacerbate neuroniflammatory damage. The high correlation between hippocampal NMDA receptor loss and disease progression supports the use of non invasive imaging with NMDA receptor tracers and positron emission tomography as a superior method for diagnosis, staging and treatment monitoring of AD in vivo.
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Affiliation(s)
- Efrat Kravitz
- J. Sagol Neuroscience Center, Sheba Medical Center, Ramat Gan, Israel
| | | | - Anat Biegon
- Department Neurology, Stony Brook University School of Medicine, Stony Brook, New York, United States of America
- * E-mail:
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Faraco CC, Puente AN, Brown C, Terry DP, Stephen Miller L. Lateral temporal hyper-activation as a novel biomarker of mild cognitive impairment. Neuropsychologia 2013; 51:2281-93. [PMID: 23933482 DOI: 10.1016/j.neuropsychologia.2013.07.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Revised: 07/29/2013] [Accepted: 07/30/2013] [Indexed: 11/25/2022]
Abstract
Memory dysfunction in mild cognitive impairment (MCI) due to Alzheimer's pathology is primarily associated with episodic memory deficits linked to deterioration of the medial temporal lobes (MTLs). Currently, there is a call to discover novel biomarkers of MCI in order to improve research criteria. Functional activation differences in MCI during episodic memory-task performance are often evidenced in the MTLs, and frontal and parietal lobes, but it has been suggested that examination of working memory (WM) differences may be more useful in detecting MCI. In the current study, MCI and control participants performed a complex WM span (CWMS) task while functional magnetic resonance imaging (fMRI) data were acquired. Results indicated hyper-activation of the lateral temporal lobes, MTLs, and frontal and parietal regions during encoding and maintenance, and hyper-activation of the lateral temporal, frontal, and parietal lobes during CWMS recall for the MCI participants. Medial and lateral temporal differences during encoding and maintenance are consistent with previous findings, but lateral temporal differences are often not elaborated upon. Hyper-activation of the lateral temporal lobes during WM encoding and maintenance, and also during recall, suggests that this region may provide valuable information regarding WM impairment in MCI and Alzheimer's. Given that whole-brain functional imaging of the MTLs is often limited due to artifact and partial voluming of sub-fields, examination of lateral temporal differences may provide a novel biomarker related to WM impairment in MCI.
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Affiliation(s)
- Carlos C Faraco
- Biomedical Health Sciences Institute, Division of Neuroscience, University of Georgia, Psychology Building, Athens, GA 30602, United States.
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Salotti P, De Sanctis B, Clementi A, Fernandez Ferreira M, De Silvestris T. Evaluation of the efficacy of a cognitive rehabilitation treatment on a group of Alzheimer's patients with moderate cognitive impairment: a pilot study. Aging Clin Exp Res 2013; 25:403-9. [PMID: 23760946 DOI: 10.1007/s40520-013-0062-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Accepted: 02/06/2013] [Indexed: 11/24/2022]
Abstract
The aim of this study was to evaluate the efficacy of a cognitive rehabilitation intervention performed in an Alzheimer's Day Care Center for 12 months on patients suffering from Alzheimer's-type dementia with moderate cognitive impairment. In the cognitive rehabilitation treatment of moderate cognitive impairment, the leading cognitive stimulation techniques are reality orientation therapy and cognitive training. While these techniques are meant to treat different cognitive environments, there is scarce documentation in literature about their joint use. For this purpose, the therapy was administered to two groups of patients: the experimental group was composed of four subjects and received cognitive rehabilitation (cognitive training plus reality orientation therapy); the control group was composed of five subjects and received aspecific stimulation. To assess subjects' responses the Milan Overall Dementia Assessment and the Mini-Mental State Examination were used for the cognitive domain, while the Geriatric Depression Scale was used for the affective sphere. The results indicated that the subjects submitted to cognitive rehabilitation obtain statistically significant results compared to the control group from the 9 months of treatment, in clinical terms; they maintain their cognitive performance, while no significant differences were found between the two groups as far as the affective domain is concerned.
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Affiliation(s)
- Paolo Salotti
- General Unit of Psychology, Adult Neuropsychology Outpatients' Department, Belcolle Hospital, AUSL Viterbo, Viterbo, Italy.
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Lee GY, Yip CCK, Yu ECS, Man DWK. Evaluation of a computer-assisted errorless learning-based memory training program for patients with early Alzheimer's disease in Hong Kong: a pilot study. Clin Interv Aging 2013; 8:623-33. [PMID: 23766638 PMCID: PMC3679968 DOI: 10.2147/cia.s45726] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Improving the situation in older adults with cognitive decline and evidence of cognitive rehabilitation is considered crucial in long-term care of the elderly. The objective of this study was to implement a computerized errorless learning-based memory training program (CELP) for persons with early Alzheimer's disease, and to compare the training outcomes of a CELP group with those of a therapist-led errorless learning program (TELP) group and a waiting-list control group. METHODS A randomized controlled trial with a single-blind research design was used in the study. Chinese patients with early Alzheimer's disease screened by the Clinical Dementia Rating (score of 1) were recruited. The subjects were randomly assigned to CELP (n = 6), TELP (n = 6), and waiting-list control (n = 7) groups. Evaluation of subjects before and after testing, and at three-month follow-up was achieved using primary outcomes on the Chinese Mini-Mental State Examination, Chinese Dementia Rating Scale, Hong Kong List Learning Test, and the Brief Assessment of Prospective Memory-Short Form. Secondary outcomes were the Modified Barthel Index, Hong Kong Lawton Instrumental Activities of Daily Living Scale, and Geriatric Depression Scale-Short Form. The data were analyzed using Friedman's test for time effect and the Kruskal-Wallis test for treatment effect. RESULTS Positive treatment effects on cognition were found in two errorless learning-based memory groups (ie, computer-assisted and therapist-led). Remarkable changes were shown in cognitive function for subjects receiving CELP and emotional/daily functions in those receiving TELP. CONCLUSION Positive changes in the cognitive function of Chinese patients with early Alzheimer's disease were initially found after errorless training through CELP. Further enhancement of the training program is recommended.
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Affiliation(s)
- Grace Y Lee
- Occupational Therapy Department, Kwai Chung Hospital, Hong Kong, People’s Republic of China
| | - Calvin CK Yip
- CY Functional Recovery Services, Hong Kong, People’s Republic of China
| | - Edwin CS Yu
- Psychogeriatric Team, Kwai Chung Hospital, Hong Kong, People’s Republic of China
| | - David WK Man
- Department of Rehabilitation Sciences, the Hong Kong Polytechnic University, Hong Kong, People’s Republic of China
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Niu HJ, Li X, Chen YJ, Ma C, Zhang JY, Zhang ZJ. Reduced frontal activation during a working memory task in mild cognitive impairment: a non-invasive near-infrared spectroscopy study. CNS Neurosci Ther 2012; 19:125-31. [PMID: 23279823 DOI: 10.1111/cns.12046] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 11/09/2012] [Accepted: 11/14/2012] [Indexed: 11/29/2022] Open
Abstract
AIMS Working memory (WM) impairments are considered to be a main feature of mild cognitive impairment (MCI). Functional brain imaging studies have revealed evidence of alterations in the frontal and temporal cortices associated with WM in MCI patients. However, some imaging methods are too expensive for routine clinical use and have a low temporal resolution. METHODS Using a newly developed near-infrared spectroscopy (NIRS) system, we studied the spatiotemporal dynamics of oxygenated hemoglobin (oxy-Hb) during a WM task in eight patients with mild cognitive impairment (MCI) and 16 age- and gender-matched healthy controls. RESULTS We performed temporal and spatial correlation analyses on each group during their WM tasks. These results consistently demonstrated that, when compared with the healthy controls, the MCI patients exhibited significantly decreased activation in the left frontal, right superior frontal and left temporal lobes. We found evidence of altered frontal and temporal processing during WM tasks in the MCI patients. CONCLUSIONS These results confirm the functional deficits in the frontal and temporal cortices and the impairment of WM and cognitive abilities in MCI patients and suggest that fNIRS may be a useful tool for evaluating brain activation in cognitive disorders.
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Affiliation(s)
- Hai-Jing Niu
- State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, China
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28
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Tripathy R, McHugh RJ, Bacon ER, Salvino JM, Morton GC, Aimone LD, Huang Z, Mathiasen JR, DiCamillo A, Huffman MJ, McKenna BA, Kopec K, Lu LD, Qian J, Angeles TS, Connors T, Spais C, Holskin B, Duzic E, Schaffhauser H, Rossé GC. Discovery of 7-arylsulfonyl-1,2,3,4, 4a,9a-hexahydro-benzo[4,5]furo[2,3-c]pyridines: Identification of a potent and selective 5-HT6 receptor antagonist showing activity in rat social recognition test. Bioorg Med Chem Lett 2012; 22:1421-6. [DOI: 10.1016/j.bmcl.2011.12.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 12/01/2011] [Accepted: 12/05/2011] [Indexed: 01/01/2023]
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Snyder AN, Bockbrader MA, Hoffa AM, Dzemidzic MA, Talavage TM, Wong D, Lowe MJ, O'Donnell BF, Shekhar A. Psychometrically matched tasks evaluating differential fMRI activation during form and motion processing. Neuropsychology 2012; 25:622-33. [PMID: 21534685 DOI: 10.1037/a0022984] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
OBJECTIVE Deficits in visual perception and working memory are commonly observed in neuropsychiatric disorders and have been investigated using functional MRI (fMRI). However, interpretation of differences in brain activation may be confounded with differences in task performance between groups. Differences in task difficulty across conditions may also pose interpretative issues in studies of visual processing in healthy subjects. METHOD To address these concerns, the present study characterized brain activation in tasks that were psychometrically matched for difficulty; fMRI was used to assess brain activation in 10 healthy subjects during discrimination and working memory judgments for static and moving stimuli. For all task conditions, performance accuracy was matched at 70.7%. RESULTS Areas associated with V2 and V5 in the dorsal stream were activated during motion processing tasks and V4 in the ventral stream were activated during form processing tasks. Frontoparietal areas associated with working memory were also statistically significant during the working memory tasks. CONCLUSIONS Application of psychophysical methods to equate task demands provides a practical method to equate performance levels across conditions in fMRI studies and to compare healthy and cognitively impaired groups at comparable levels of effort. These psychometrically matched tasks can be applied to patients with a variety of cognitive disorders to investigate dysfunction of multiple a priori defined brain regions. Measuring the changes in typical activation patterns in patients with these diseases can be useful for monitoring disease progression, evaluating new drug treatments, and possibly for developing methods for early diagnosis.
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Affiliation(s)
- Andrea N Snyder
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA.
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30
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Da Silva Costa-Aze V, Dauphin F, Boulouard M. Serotonin 5-HT6 receptor blockade reverses the age-related deficits of recognition memory and working memory in mice. Behav Brain Res 2011; 222:134-40. [DOI: 10.1016/j.bbr.2011.03.046] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 03/14/2011] [Accepted: 03/18/2011] [Indexed: 01/29/2023]
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31
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Neuroprotective effect of carvedilol against aluminium induced toxicity: possible behavioral and biochemical alterations in rats. Pharmacol Rep 2011; 63:915-23. [DOI: 10.1016/s1734-1140(11)70607-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Revised: 04/06/2011] [Indexed: 10/25/2022]
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Dong Y, Kataoka K, Tokutomi Y, Nako H, Nakamura T, Toyama K, Sueta D, Koibuchi N, Yamamoto E, Ogawa H, Kim‐Mitsuyama S. Perindopril, a centrally active angiotensin‐converting enzyme inhibitor, prevents cognitive impairment in mouse models of Alzheimer's disease. FASEB J 2011; 25:2911-20. [DOI: 10.1096/fj.11-182873] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Yi‐Fei Dong
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Keiichiro Kataoka
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Yoshiko Tokutomi
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Hisato Nako
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Taishi Nakamura
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Kensuke Toyama
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Daisuke Sueta
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Nobutaka Koibuchi
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Eiichiro Yamamoto
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Hisao Ogawa
- Department of Cardiovascular MedicineKumamoto University Graduate School of Medical SciencesKumamotoJapan
| | - Shokei Kim‐Mitsuyama
- Department of Pharmacology and Molecular TherapeuticsKumamoto University Graduate School of Medical SciencesKumamotoJapan
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Nordvik JE, Schanke AK, Landro NI. Errorless learning and working memory: The impact of errors, distractors, and memory span load on immediate recall in healthy adults. J Clin Exp Neuropsychol 2011; 33:587-95. [DOI: 10.1080/13803395.2010.543886] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Jan E. Nordvik
- a Centre for the Study of Human Cognition, Department of Psychology , University of Oslo , Oslo, Norway
| | - Anne-Kristine Schanke
- a Centre for the Study of Human Cognition, Department of Psychology , University of Oslo , Oslo, Norway
- b Sunnaas Rehabilitation Hospital , Nesodden, Norway
| | - Nils I. Landro
- a Centre for the Study of Human Cognition, Department of Psychology , University of Oslo , Oslo, Norway
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Rodriguez JS, Zürcher NR, Bartlett TQ, Nathanielsz PW, Nijland MJ. CANTAB delayed matching to sample task performance in juvenile baboons. J Neurosci Methods 2011; 196:258-63. [PMID: 21276821 DOI: 10.1016/j.jneumeth.2011.01.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 01/07/2011] [Accepted: 01/10/2011] [Indexed: 10/18/2022]
Abstract
This study reports the administration of the Cambridge Neuropsychological Test Automated Battery system's delayed matching to sample (DMTS) task to juvenile baboons. Nine subjects (female=5, male=4) were trained with delay intervals ranging from 0 to 80s. Trial unique stimuli were utilized in combination with matching to sample, in contrast to non-matching to sample, to more accurately assess components of medial temporal lobe (hippocampal formation) mediated working memory. These parameters force subjects to rely on recognition for matching stimuli and overcome their innate tendency to choose novel stimuli (non-matching), thus increasing task difficulty. Testing with delays intervals of 0-2, 4, 8, and 16s revealed decreased percent correct responding as delay intervals increased. An effect of 1 vs. 3 distractor stimuli on accuracy was also noted. Increasing the number of distractors resulted in decreased observing response latencies. The increase in choice response latency seen with increasing delay interval was independent of number of distractor stimuli presented. There were no sex differences in task performance. Our laboratory is focused on understanding the functional consequences of suboptimal conditions during pregnancy and early postnatal life in offspring. The ability of juvenile baboons to perform the DMTS task demonstrates the utility of this non-human primate model in examining pre- and post-natal conditions that impact the development of working memory. Evaluation of causes and consequences of impaired working memory in a variety of human diseases will be assisted by the use of this task in nonhuman primate models of human health and disease.
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Affiliation(s)
- Jesse S Rodriguez
- Center for Pregnancy and Newborn Research, Department of Obstetrics and Gynecology, University of Texas Health Science Center at San Antonio, San Antonio, TX 79229,USA.
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Ramirez JJ, Poulton WE, Knelson E, Barton C, King MA, Klein RL. Focal expression of mutated tau in entorhinal cortex neurons of rats impairs spatial working memory. Behav Brain Res 2011; 216:332-40. [PMID: 20727915 PMCID: PMC2975819 DOI: 10.1016/j.bbr.2010.08.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2010] [Revised: 08/06/2010] [Accepted: 08/12/2010] [Indexed: 01/21/2023]
Abstract
Entorhinal cortex neuropathology begins very early in Alzheimer's disease (AD), a disorder characterized by severe memory disruption. Indeed, loss of entorhinal volume is predictive of AD and two of the hallmark neuroanatomical markers of AD, amyloid plaques and neurofibrillary tangles (NFTs), are particularly prevalent in the entorhinal area of AD-afflicted brains. Gene transfer techniques were used to create a model neurofibrillary tauopathy by injecting a recombinant adeno-associated viral vector with a mutated human tau gene (P301L) into the entorhinal cortex of adult rats. The objective of the present investigation was to determine whether adult onset, spatially restricted tauopathy could be sufficient to reproduce progressive deficits in mnemonic function. Spatial memory on a Y-maze was tested for approximately 3 months post-surgery. Upon completion of behavioral testing the brains were assessed for expression of human tau and evidence of tauopathy. Rats injected with the tau vector became persistently impaired on the task after about 6 weeks of postoperative testing, whereas the control rats injected with a green fluorescent protein vector performed at criterion levels during that period. Histological analysis confirmed the presence of hyperphosphorylated tau and NFTs in the entorhinal cortex and neighboring retrohippocampal areas as well as limited synaptic degeneration of the perforant path. Thus, highly restricted vector-induced tauopathy in retrohippocampal areas is sufficient for producing progressive impairment in mnemonic ability in rats, successfully mimicking a key aspect of tauopathies such as AD.
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Affiliation(s)
- Julio J Ramirez
- Department of Psychology, Davidson College, Davidson, NC 28035, USA.
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Price JP. The computerized object and abstract designs test (COAD): A pilot study of a new test of visual working memory. BRITISH JOURNAL OF CLINICAL PSYCHOLOGY 2010; 48:109-23. [DOI: 10.1348/014466508x366713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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37
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Bitner RS, Bunnelle WH, Decker MW, Drescher KU, Kohlhaas KL, Markosyan S, Marsh KC, Nikkel AL, Browman K, Radek R, Anderson DJ, Buccafusco J, Gopalakrishnan M. In Vivo Pharmacological Characterization of a Novel Selective α7 Neuronal Nicotinic Acetylcholine Receptor Agonist ABT-107: Preclinical Considerations in Alzheimer's Disease. J Pharmacol Exp Ther 2010; 334:875-86. [DOI: 10.1124/jpet.110.167213] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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Spuch C, Antequera D, Portero A, Orive G, Hernández RM, Molina JA, Bermejo-Pareja F, Pedraz JL, Carro E. The effect of encapsulated VEGF-secreting cells on brain amyloid load and behavioral impairment in a mouse model of Alzheimer's disease. Biomaterials 2010; 31:5608-18. [PMID: 20430437 DOI: 10.1016/j.biomaterials.2010.03.042] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2010] [Accepted: 03/17/2010] [Indexed: 12/17/2022]
Abstract
Cerebrovascular dysfunction contributes to cognitive decline and neurodegeneration in Alzheimer's disease (AD). Vascular endothelial growth factor (VEGF), an angiogenic protein with important neurotrophic and neuroprotective actions, is under investigation as a therapeutic agent for the treatment of neurodegenerative disorders. The aim of this study was to generate encapsulated VEGF-secreting cells and implant them in a transgenic mouse model of AD, the double mutant amyloid precursor protein/presenilin 1 (APP/Ps1) mice, which shows a disturbed vessel homeostasis. We report that, after implantation of VEGF microcapsules, brain Abeta burden, hyperphosphorylated-tau and cognitive impairment attenuated in APP/Ps1 mice. Based on the neurovascular hypothesis, our findings suggest a new potential therapeutic approach that could be developed for AD, to enhance Abeta clearance and neurovascular repair, and to protect the cognitive behavior. Stereologically-implanted encapsulated VEGF-secreting cells could offer an alternative strategy in the treatment of AD.
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Affiliation(s)
- Carlos Spuch
- Neuroscience Laboratory, Research Center, Hospital 12 de Octubre, Madrid, Spain
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Huntley JD, Howard RJ. Working memory in early Alzheimer's disease: a neuropsychological review. Int J Geriatr Psychiatry 2010; 25:121-32. [PMID: 19672843 DOI: 10.1002/gps.2314] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
BACKGROUND Reports of the extent of working memory (WM) impairment in early Alzheimer's disease (AD) have been inconsistent. Using the model of WM proposed by Baddeley, neuropsychological evidence for the impairment of WM in early AD is evaluated. METHOD Literature searches were performed using Medline, PsycINFO and Embase databases. Individual papers were then examined for additional references not revealed by computerised searches. RESULTS Phonological loop function is intact at the preclinical and early stages of AD, becoming more impaired as the disease progresses. In mild AD, there is impairment on tasks assessing visuospatial sketchpad (VSS) function; however, these tasks also require executive processing by the central executive system (CES). There is evidence that the CES is impaired in mild AD and may be affected in the earlier preclinical stage of the disease. Episodic buffer function may be impaired but further research is required. CONCLUSIONS Future research into central executive functioning at the earliest stages of the disease, combined with further longitudinal studies, needs to be carried out. Tasks to assess the proposed functions of the episodic buffer and specific tests of the VSS suitable for AD subjects need to be developed and validated. Learning more about these processes and how they are affected in AD is important in understanding and managing the cognitive deficits seen in the early stages of AD.
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Affiliation(s)
- J D Huntley
- Section of Old Age Psychiatry, Institute of Psychiatry, London, UK.
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Hoffmann I, Nemeth D, Dye CD, Pákáski M, Irinyi T, Kálmán J. Temporal parameters of spontaneous speech in Alzheimer's disease. INTERNATIONAL JOURNAL OF SPEECH-LANGUAGE PATHOLOGY 2010; 12:29-34. [PMID: 20380247 DOI: 10.3109/17549500903137256] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This paper reports on four temporal parameters of spontaneous speech in three stages of Alzheimer's disease (mild, moderate, and severe) compared to age-matched normal controls. The analysis of the time course of speech has been shown to be a particularly sensitive neuropsychological method to investigate cognitive processes such as speech planning and production. The following parameters of speech were measured in Hungarian native-speakers with Alzheimer's disease and normal controls: articulation rate, speech tempo, hesitation ratio, and rate of grammatical errors. Results revealed significant differences in most of these speech parameters among the three Alzheimer's disease groups. Additionally, the clearest difference between the normal control group and the mild Alzheimer's disease group involved the hesitation ratio, which was significantly higher in the latter group. This parameter of speech may have diagnostic value for mild-stage Alzheimer's disease and therefore could be a useful aid in medical practice.
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Affiliation(s)
- Ildikó Hoffmann
- Department of Linguistics, University of Szeged, Szeged, Hungary.
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Grönholm-Nyman P, Rinne JO, Laine M. Learning and forgetting new names and objects in MCI and AD. Neuropsychologia 2009; 48:1079-88. [PMID: 20006630 DOI: 10.1016/j.neuropsychologia.2009.12.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2008] [Revised: 11/25/2009] [Accepted: 12/07/2009] [Indexed: 11/16/2022]
Abstract
We studied how subjects with mild cognitive impairment (MCI), early Alzheimer's disease (AD) and age-matched controls learned and maintained the names of unfamiliar objects that were trained with or without semantic support (object definitions). Naming performance, phonological cueing, incidental learning of the definitions and recognition of the objects were tested during follow-up. We found that word learning was significantly impaired in MCI and AD patients, whereas forgetting patterns were similar across groups. Semantic support showed a beneficial effect on object name retrieval in the MCI group 8 weeks after training, suggesting that the MCI patients' preserved semantic memory can compensate for impaired episodic memory. The MCI group performed equally well as the controls in the tasks measuring incidental learning and recognition memory, whereas the AD group showed impairment in this respect. Both the MCI and the AD group benefited less from phonological cueing than the controls. Our findings indicate that word learning is compromised in both MCI and AD, whereas long-term retention of newly learned words is not affected to the same extent. Incidental learning and recognition memory seem to be well preserved in MCI.
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Im HI, Nakajima A, Gong B, Xiong X, Mamiya T, Gershon ES, Zhuo M, Tang YP. Post-training dephosphorylation of eEF-2 promotes protein synthesis for memory consolidation. PLoS One 2009; 4:e7424. [PMID: 19823585 PMCID: PMC2757674 DOI: 10.1371/journal.pone.0007424] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Accepted: 09/19/2009] [Indexed: 01/03/2023] Open
Abstract
Memory consolidation, which converts acquired information into long-term storage, is new protein synthesis-dependent. As protein synthesis is a dynamic process that is under the control of multiple translational mechanisms, however, it is still elusive how these mechanisms are recruited in response to learning for memory consolidation. Here we found that eukaryotic elongation factor-2 (eEF-2) was dramatically dephosphorylated within 0.5–2 hr in the hippocampus and amygdala of mice following training in a fear-conditioning test, whereas genome-wide microarrays did not reveal any significant change in the expression level of the mRNAs for translational machineries or their related molecules. Moreover, blockade of NMDA receptors with MK-801 immediately following the training significantly impeded both the post-training eEF-2 dephosphorylation and memory retention. Notably, with an elegant sophisticated transgenic strategy, we demonstrated that hippocampus-specific overexpression of eEF-2 kinase, a kinase that specifically phosphorylates and hence inactivates eEF-2, significantly inhibited protein synthesis in the hippocampus, and this effects was more robust during an “ongoing” protein synthesis process. As a result, late phase long-term potentiation (L-LTP) in the hippocampus and long-term hippocampus-dependent memory in the mice were significantly impaired, whereas short-term memory and long-term hippocampus-independent memory remained intact. These results reveal a novel translational underpinning for protein synthesis pertinent to memory consolidation in the mammalian brain.
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Affiliation(s)
- Heh-In Im
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
- Neuroscience Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Akira Nakajima
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
- Neuroscience Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Bo Gong
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Xiaoli Xiong
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Takayoshi Mamiya
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
- Neuroscience Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Elliot S. Gershon
- Departments of Psychiatry and Human Genetics, the University of Chicago, Chicago, Illinois, United States of America
| | - Min Zhuo
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Ya-Ping Tang
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
- Neuroscience Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
- * E-mail:
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Spuch C, Antequera D, Isabel Fernandez-Bachiller M, Isabel Rodríguez-Franco M, Carro E. A New Tacrine–Melatonin Hybrid Reduces Amyloid Burden and Behavioral Deficits in a Mouse Model of Alzheimer’s Disease. Neurotox Res 2009; 17:421-31. [DOI: 10.1007/s12640-009-9121-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Revised: 09/15/2009] [Accepted: 09/15/2009] [Indexed: 12/31/2022]
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Lee SB, Park CS, Jeong JW, Choe JY, Hwang YJ, Park CA, Park JH, Lee DY, Jhoo JH, Kim KW. Effects of spaced retrieval training (SRT) on cognitive function in Alzheimer's disease (AD) patients. Arch Gerontol Geriatr 2009; 49:289-293. [DOI: 10.1016/j.archger.2008.10.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2008] [Revised: 10/27/2008] [Accepted: 10/29/2008] [Indexed: 11/28/2022]
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Bueno OFA, Bertolucci PHF, Oliveira MGM, Abrisqueta-Gomez J. Effects of semantic relations, repetition of words, and list length in word list recall of Alzheimer's patients. ARQUIVOS DE NEURO-PSIQUIATRIA 2009; 66:312-7. [PMID: 18641862 DOI: 10.1590/s0004-282x2008000300005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2007] [Accepted: 03/24/2008] [Indexed: 11/22/2022]
Abstract
INTRODUCTION Semantic relations among words and repetition enhance free recall, but it is unknown if these facilitating factors are effective in dementia. METHOD Alzheimer's patients (MILD-Alz, MOD-Alz) were compared to healthy elderly. Fifteen-word lists were read out to the subjects. In four sets of lists the words in intermediary input positions were semantically related or not, or the midlist words were repeated, or they were repeated and semantically related. RESULTS The usual third peak of recall of semantically related words was not observed in MOD-Alz, repetition of words did not increase recall of the patients, and the combination of relatedness and repetition benefited only MID-Alz. In a second experiment, with related or unrelated midlist words, and list length shortened from 15 to 9 words, semantic facilitation was observed in mild and moderate Alzheimer s patients, although diminished compared to controls. CONCLUSION Progression of dementia turns facilitating factors of recall less effective.
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Affiliation(s)
- Orlando F A Bueno
- Departamento de Psicobiologia, Universidade Federal de São Paulo, SP, Brazil.
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Prakash A, Kumar A. Effect ofN-Acetyl Cysteine against Aluminium-induced Cognitive Dysfunction and Oxidative Damage in Rats. Basic Clin Pharmacol Toxicol 2009; 105:98-104. [DOI: 10.1111/j.1742-7843.2009.00404.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kalirin regulates cortical spine morphogenesis and disease-related behavioral phenotypes. Proc Natl Acad Sci U S A 2009; 106:13058-63. [PMID: 19625617 DOI: 10.1073/pnas.0904636106] [Citation(s) in RCA: 130] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Dendritic spine morphogenesis contributes to brain function, cognition, and behavior, and is altered in psychiatric disorders. Kalirin is a brain-specific guanine-nucleotide exchange factor (GEF) for Rac-like GTPases and is a key regulator of spine morphogenesis. Here, we show that KALRN-knockout mice have specific reductions in cortical, but not hippocampal, Rac1 signaling and spine density, and exhibit reduced cortical glutamatergic transmission. These mice exhibit robust deficits in working memory, sociability, and prepulse inhibition, paralleled by locomotor hyperactivity reversible by clozapine in a kalirin-dependent manner. Several of these deficits are delayed and age-dependent. Our study thus links spine morphogenic signaling with age-dependent, delayed, disease-related phenotypes, including cognitive dysfunction.
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Riedel G, Kang SH, Choi DY, Platt B. Scopolamine-induced deficits in social memory in mice: reversal by donepezil. Behav Brain Res 2009; 204:217-25. [PMID: 19527754 DOI: 10.1016/j.bbr.2009.06.012] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2008] [Revised: 06/03/2009] [Accepted: 06/05/2009] [Indexed: 11/30/2022]
Abstract
Deficits in social behaviour is a characteristic of numerous mental disorders including autism, schizophrenia, depression and Alzheimer's disease. For the assessment of pharmacological and genetic experimental disease models, conventional social interaction tasks bear the uncertainty that any drug-induced abnormality of the investigator may feed back to the drug-free companion modifying its reactions. A considerable technical improvement was recently reported by Moy et al. [Moy SS, Nadler JJ, Perez A, Barbaro RP, Johns JM, Magnuson T, et al. Sociability and preference for social novelty in five inbred strains: an approach to assess autistic-like behaviours in mice. Genes Brain Behav 2004;3:287-302] in which the drug free partner is confined to a small cage and social contacts of the investigator are recorded uncontaminated of any social reactions of the stranger. Using this novel behavioural paradigm, we here show in C57Bl/6 female mice that sociability (social interaction with a stranger mouse) is not impaired after administration of the anxiolytic diazepam (0.1-1 mg/kg) or the muscarinic antagonist scopolamine hydrobromide (0.1-1 mg/kg). However, social memory tested after a short time interval was impaired by both drugs in a dose-dependent manner (diazepam: > or = 0.5mg/kg; scopolamine: > or = 0.3mg/kg). The scopolamine-induced short-term memory deficit was reversed to normal by the choline esterase inhibitor donepezil (1 mg/kg). Given this dependence of social recognition on the cholinergic system, combined with the clinical observation of reduced social contacts in dementia patients, sociability may offer a novel endpoint biomarker with translational value in experimental models of cognitive dysfunction.
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Affiliation(s)
- G Riedel
- School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK.
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Abstract
The working memory construct refers to the capacity to maintain information for a
limited time.
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Affiliation(s)
- Vanessa Tomé Gonçalves
- Speech pathologist, PhD in Neurogeriatrics. Laboratory of Neurolinguistics. Department of Physiotherapy, Speech Therapy and Occupational Therapy of the University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Letícia Lessa Mansur
- Speech pathologist, PhD in Neurogeriatrics. Laboratory of Neurolinguistics. Department of Physiotherapy, Speech Therapy and Occupational Therapy of the University of São Paulo School of Medicine, São Paulo SP, Brazil
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Sánchez-Carrión R, Gómez PV, Junqué C, Fernández-Espejo D, Falcon C, Bargalló N, Roig-Rovira T, Enseñat-Cantallops A, Bernabeu M. Frontal Hypoactivation on Functional Magnetic Resonance Imaging in Working Memory after Severe Diffuse Traumatic Brain Injury. J Neurotrauma 2008; 25:479-94. [DOI: 10.1089/neu.2007.0417] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Rocío Sánchez-Carrión
- Department of Neuropsychology, Institut Universitari de Neurorehabilitació Guttmann, Badalona, Spain
| | - Pere Vendrell Gómez
- Department of Psychiatry and Clinical Psychobiology, University of Barcelona, Barcelona, Spain
- Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Carme Junqué
- Department of Psychiatry and Clinical Psychobiology, University of Barcelona, Barcelona, Spain
- Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | | | - Carles Falcon
- Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Neuroradiology Section, Radiology Department, Centre de Diagnòstic per la Imatge (CDI), Hospital Clinic, Barcelona, Spain
| | - Nuria Bargalló
- Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Neuroradiology Section, Radiology Department, Centre de Diagnòstic per la Imatge (CDI), Hospital Clinic, Barcelona, Spain
| | - Teresa Roig-Rovira
- Department of Neuropsychology, Institut Universitari de Neurorehabilitació Guttmann, Badalona, Spain
| | | | - Montserrat Bernabeu
- Head Injury Unit, Institut Universitari de Neurorehabilitació Guttmann, Badalona, Spain
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