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Kloc R, Urbanska EM. Memantine and the Kynurenine Pathway in the Brain: Selective Targeting of Kynurenic Acid in the Rat Cerebral Cortex. Cells 2024; 13:1424. [PMID: 39272996 DOI: 10.3390/cells13171424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2024] [Revised: 08/05/2024] [Accepted: 08/23/2024] [Indexed: 09/15/2024] Open
Abstract
Cytoprotective and neurotoxic kynurenines formed along the kynurenine pathway (KP) were identified as possible therapeutic targets in various neuropsychiatric conditions. Memantine, an adamantane derivative modulating dopamine-, noradrenaline-, serotonin-, and glutamate-mediated neurotransmission is currently considered for therapy in dementia, psychiatric disorders, migraines, or ischemia. Previous studies have revealed that memantine potently stimulates the synthesis of neuroprotective kynurenic acid (KYNA) in vitro via a protein kinase A-dependent mechanism. Here, the effects of acute and prolonged administration of memantine on brain kynurenines and the functional changes in the cerebral KP were assessed in rats using chromatographic and enzymatic methods. Five-day but not single treatment with memantine selectively activated the cortical KP towards neuroprotective KYNA. KYNA increases were accompanied by a moderate decrease in cortical tryptophan (TRP) and L-kynurenine (L-KYN) concentrations without changes in 3-hydroxykynurenine (3-HK) levels. Enzymatic studies revealed that the activity of cortical KYNA biosynthetic enzymes ex vivo was stimulated after prolonged administration of memantine. As memantine does not directly stimulate the activity of KATs' proteins, the higher activity of KATs most probably results from the increased expression of the respective genes. Noteworthy, the concentrations of KYNA, 3-HK, TRP, and L-KYN in the striatum, hippocampus, and cerebellum were not affected. Selective cortical increase in KYNA seems to represent one of the mechanisms underlying the clinical efficacy of memantine. It is tempting to hypothesize that a combination of memantine and drugs could strongly boost cortical KYNA and provide a more effective option for treating cortical pathologies at early stages. Further studies should evaluate this issue in experimental animal models and under clinical scenarios.
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Affiliation(s)
- Renata Kloc
- Chair and Department of Experimental and Clinical Pharmacology, Medical University of Lublin, 20-090 Lublin, Poland
| | - Ewa M Urbanska
- Chair and Department of Experimental and Clinical Pharmacology, Medical University of Lublin, 20-090 Lublin, Poland
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2
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Karimi Tari P, Parsons CG, Collingridge GL, Rammes G. Memantine: Updating a rare success story in pro-cognitive therapeutics. Neuropharmacology 2024; 244:109737. [PMID: 37832633 DOI: 10.1016/j.neuropharm.2023.109737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 09/25/2023] [Accepted: 09/26/2023] [Indexed: 10/15/2023]
Abstract
The great potential for NMDA receptor modulators as druggable targets in neurodegenerative disorders has been met with limited success. Considered one of the rare exceptions, memantine has consistently demonstrated restorative and prophylactic properties in many AD models. In clinical trials memantine slows the decline in cognitive performance associated with AD. Here, we provide an overview of the basic properties including pharmacological targets, toxicology and cellular effects of memantine. Evidence demonstrating reductions in molecular, physiological and behavioural indices of AD-like impairments associated with memantine treatment are also discussed. This represents both an extension and homage to Dr. Chris Parson's considerable contributions to our fundamental understanding of a success story in the AD treatment landscape.
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Affiliation(s)
- Parisa Karimi Tari
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, ON, M5G 1X5, Canada
| | - Chris G Parsons
- Galimedix Therapeutics, Inc., 2704 Calvend Lane, Kensington, 20895, MD, USA
| | - Graham L Collingridge
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, ON, M5G 1X5, Canada; Department of Physiology, University of Toronto, Toronto, ON, M5S 1A8, Canada; TANZ Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, ON, M5S 1A8, Canada.
| | - Gerhard Rammes
- Department of Anesthesiology and Intensive Care Medicine of the Technical University of Munich, School of Medicine, 22, 81675, Munich, Germany.
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3
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Zhou X. Preventive and Therapeutic Autoantibodies Protect against Neuronal Excitotoxicity. JOURNAL OF PSYCHIATRY AND BRAIN SCIENCE 2023; 8:e230006. [PMID: 37502631 PMCID: PMC10373126 DOI: 10.20900/jpbs.20230006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
High titers of anti-NMDAR1 IgG autoantibodies were found in the brains of patients with anti-NMDAR1 encephalitis that exhibits psychosis, impaired memory, and many other psychiatric symptoms in addition to neurological symptoms. Low titers of blood circulating anti-NMDAR1 IgG autoantibodies are sufficient to robustly impair spatial working memory in mice with intact blood-brain barriers (BBB). On the other hand, anti-NMDAR1 autoantibodies were reported to protect against neuronal excitotoxicity caused by excessive glutamate in neurological diseases. Activation of extrasynaptic NMDARs is responsible for neuronal excitotoxicity, whereas activation of synaptic NMDARs within the synaptic cleft is pro-survival and essential for NMDAR-mediated neurotransmission. Unlike small IgG, IgM antibodies are large and pentameric (diameter of ~30 nm). It is plausible that IgM anti-NMDAR1 autoantibodies may be restricted to bind extrasynaptic NMDARs and thereby specifically inhibit neuronal excitotoxicity, but physically too large to enter the synaptic cleft (width: 20-30 nm) to suppress synaptic NMDAR-mediated neurotransmission in modulation of cognitive function and neuronal pro-survival signaling. Hence, blood circulating anti-NMDAR1 IgM autoantibodies are both neuroprotective and pro-cognitive, whereas blood circulating anti-NMDAR1 IgG and IgA autoantibodies are detrimental to cognitive function. Investigation of anti-NMDAR1 IgM autoantibodies may open up a new avenue for the development of long-lasting preventive and therapeutic IgM anti-NMDAR1 autoantibodies that protect from neuronal excitotoxicity in many neurological diseases and psychiatric disorders.
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Affiliation(s)
- Xianjin Zhou
- Department of Psychiatry, University of California San Diego, La Jolla, CA 92093, USA
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Zamani N, Moazedi AA, Afarinesh Khaki MR, Pourmehdi Boroujeni M. Effects of Memantine on the Spontaneous Firing Frequency of Hippocampal CA1 Pyramidal Neurons in Intact and Alzheimer Rat Model: An Electrophysiological Study. Basic Clin Neurosci 2022; 13:661-674. [PMID: 37313029 PMCID: PMC10258597 DOI: 10.32598/bcn.2021.1970.1] [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: 08/05/2019] [Revised: 02/05/2020] [Accepted: 04/19/2020] [Indexed: 11/02/2023] Open
Abstract
Introduction Memantine (MEM) is a noncompetitive N-methyl-D-aspartate receptor (NMDAR) antagonist clinically used for the treatment of Alzheimer disease (AD) in mild to severe conditions. The present study was conducted to investigate the effects of memantine on the spontaneous firing frequency of CA1 pyramidal neurons in rats caused by an electrical lesion of Nucleus Basalis Magnocellularis (NBM). Then, this model of AD rats was compared with the intact adult male rats. Methods In this study, adult male rats were divided into two groups. Group I (lesion of NBM, n=53) includes the following subgroups: lesion+saline, sham+saline, lesion+MEM 5 mg/kg, lesion+MEM 10 mg/kg, and lesion+MEM 20mg/kg. Group II (intact, n=48) includes the following subgroups: intact+saline, intact+MEM 3mg/kg, intact+MEM 5mg/kg, and intact+MEM 10mg/kg. Extracellular single-unit recording (15 min baseline+105 min after MEM or saline) was performed under urethane-anesthetized rats. Results The results showed that the mean frequency of CA1 pyramidal neurons after saline in the lesion+saline (P<0.001) group significantly decreases compared with the intact+saline and sham+saline groups. In addition, after saline and memantine, the mean frequency of CA1 pyramidal neurons in the lesion+MEM 10 mg/kg (P<0.01) and lesion+MEM 20 mg/kg (P<0.001) groups significantly increased compared with the lesion+saline group. Also, the mean frequencies of CA1 pyramidal neurons in the intact+MEM 10 mg/kg (P<0.001) group significantly decreased compared with the intact+saline group. Conclusion Results showed that memantine increases the electrical activity of CA1 pyramidal neurons in a rat model of AD. Furthermore, in the intact adult male rats, the low-dose memantine, contrary to high dose, does not decrease the electrical activity of CA1 pyramidal neurons.
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Affiliation(s)
- Nastaran Zamani
- Department of Biology, School of Science, Payame Noor University, Tehran, Iran
| | - Ahmad Ali Moazedi
- Department of Biology, School of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
- Stem Cell and Transgenic Technology Research Center, Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Mohamad Reza Afarinesh Khaki
- Kerman Cognitive Research Center, Kerman Neuroscience Research Center, Institute of Neuropharmachology, Kerman University of Medical Sciences, Kerman, Iran
| | - Mehdi Pourmehdi Boroujeni
- Department of Food Hygiene, School of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran
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Vouros A, Gehring TV, Jura B, Węsierska MJ, Wójcik DK, Vasilaki E. Strategies discovery in the active allothetic place avoidance task. Sci Rep 2022; 12:12675. [PMID: 35879365 PMCID: PMC9314408 DOI: 10.1038/s41598-022-16374-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 07/08/2022] [Indexed: 11/09/2022] Open
Abstract
The Active Allothetic Place Avoidance task is an alternative setup to Morris Water Maze that allows studying spatial memory in a dynamic world in the presence of conflicting information. In this task, a rat, freely moving on a rotating circular arena, has to avoid a sector defined within the room frame where shocks are presented. While for Morris Water Maze several studies have identified animal strategies which specifically affect performance, there were no such studies for the Active Allothetic Place Avoidance task. Using standard machine learning methods, we were able to reveal for the first time, to the best of our knowledge, explainable strategies that the animals employ in this task and demonstrate that they can provide a high-level interpretation for performance differences between an animal group treated with silver nanoparticles (AgNPs) and the control group.
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Affiliation(s)
- Avgoustinos Vouros
- Department of Computer Science, The University of Sheffield, Sheffield, S1 4DP, UK
| | - Tiago V Gehring
- Department of Computer Science, The University of Sheffield, Sheffield, S1 4DP, UK
| | - Bartosz Jura
- Faculty of Management and Social Communication, Jagiellonian University, 30-348, Cracow, Poland
| | - Małgorzata J Węsierska
- Nencki Institute of Experimental Biology of Polish Academy of Sciences, Warsaw, 02-093, Poland
| | - Daniel K Wójcik
- Faculty of Management and Social Communication, Jagiellonian University, 30-348, Cracow, Poland. .,Nencki Institute of Experimental Biology of Polish Academy of Sciences, Warsaw, 02-093, Poland.
| | - Eleni Vasilaki
- Department of Computer Science, The University of Sheffield, Sheffield, S1 4DP, UK. .,Institute of Neuroinformatics, University of Zurich and ETH Zurich, Zurich, Switzerland.
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Duda W, Węsierska M. Spatial working memory in rats: Crucial role of the hippocampus in the allothetic place avoidance alternation task demanding stimuli segregation. Behav Brain Res 2021; 412:113414. [PMID: 34119508 DOI: 10.1016/j.bbr.2021.113414] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 06/01/2021] [Accepted: 06/08/2021] [Indexed: 11/24/2022]
Abstract
Working memory is a construct that contains goal maintenance, interference control and memory capacity domains. Spatial working memory in presence of conflicting stimuli requires segregation and maintenance of the relevant information about a goal over a short period of time. Besides the prefrontal cortex, the hippocampus is an anatomical substrate for the working memory. We hypothesized that in a highly challenging task, where spatial stimuli are in a conflict and only some of them describe the goal location, the spatial working memory will be strongly dependant on the hippocampus. To verify this, we used an allothetic place avoidance alternation task (APAAT). Performance of this task demands a small number of entries and a long maximum time avoided between consecutive entries to the shock sector. These parameters reflected both domains of working memory. The experiment was conducted on hippocampal lesioned (HIPP n = 12) and sham-operated (CTRL n = 8) rats trained in four APAAT days, each consisting of four 5-minute stages: habituation, stage1 (st1) and stage2 (st2) of memory training, a 5-minute break followed by a retrieval test. The position of the shock sector was changed each day. The HIPP rats were impaired on both stages of memory training, whereas CTRL rats presented significant memory improvement on stage2. In HIPP rats the cognitive skill learning measured as shock per entrance ratio was compromised. Hippocampal lesions did not impair locomotor activity. In summary, even slight bilateral damage to the hippocampus is blocking working memory formation in a difficult task.
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Affiliation(s)
- Weronika Duda
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland.
| | - Małgorzata Węsierska
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
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Yao KX, Lyu H, Liao MH, Yang L, Gao YP, Liu QB, Wang CK, Lu YM, Jiang GJ, Han F, Wang P. Effect of low-dose Levamlodipine Besylate in the treatment of vascular dementia. Sci Rep 2019; 9:18248. [PMID: 31796756 PMCID: PMC6890753 DOI: 10.1038/s41598-019-47868-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 05/20/2019] [Indexed: 12/20/2022] Open
Abstract
Vascular dementia (VaD) is a complex disorder caused by reduced blood flow in the brain. However, there is no effective pharmacological treatment option available until now. Here, we reported that low-dose levamlodipine besylate could reverse the cognitive impairment in VaD mice model of right unilateral common carotid arteries occlusion (rUCCAO). Oral administration of levamlodipine besylate (0.1 mg/kg) could reduce the latency to find the hidden platform in the MWM test as compared to the vehicle group. Furthermore, vehicle-treated mice revealed reduced phospho-CaMKII (Thr286) levels in the hippocampus, which can be partially restored by levamlodipine besylate (0.1 mg/kg and 0.5 mg/kg) treatment. No significant outcome on microglia and astrocytes were observed following levamlodipine besylate treatment. This data reveal novel findings of the therapeutic potential of low-dose levamlodipine besylate that could considerably enhance the cognitive function in VaD mice.
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Affiliation(s)
- Kai-Xin Yao
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, China
| | - Hang Lyu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang, China
| | - Mei-Hua Liao
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang, China
| | - Lin Yang
- School of Medicine, Zhejiang University City College, Hangzhou, Zhejiang, China
| | - Yin-Ping Gao
- School of Medicine, Zhejiang University City College, Hangzhou, Zhejiang, China
| | - Qi-Bing Liu
- School of Pharmacy, Hainan Medical College, Haikou, China
| | - Cheng-Kun Wang
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang, China
| | - Ying-Mei Lu
- School of Medicine, Zhejiang University City College, Hangzhou, Zhejiang, China
| | - Guo-Jun Jiang
- Department of Pharmacy, Zhejiang Xiaoshan Hospital, Hangzhou, Zhejiang, China.
| | - Feng Han
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang, China.
| | - Ping Wang
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, China.
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A therapeutic dose of memantine improves the performance of rats in an active place avoidance task under the continuous dissociation of distal room and proximal arena cues. Neurobiol Learn Mem 2019; 162:59-66. [PMID: 31085330 DOI: 10.1016/j.nlm.2019.03.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 02/15/2019] [Accepted: 03/29/2019] [Indexed: 11/23/2022]
Abstract
Memory is related to the function of N-methyl-D-aspartate (NMDA) receptors. Depending on the dose, NMDA receptor antagonists (such as memantine or MK-801) can impair memory and/or cognitive as well as procedural functions, while they also can prevent the long-term toxic effects of over-excitation of these receptors in pathophysiological processes. There is an unresolved question of whether memantine at low doses could exert an acute pro-cognitive activity. A therapeutic dose of memantine was found to improve short-term spatial memory tested in the alternation version of active place avoidance in a Carousel Maze, whereas no data are available on long-term memory in various versions of place avoidance. In an effort to reconcile this issue, rats were administered memantine (5 mg/kg) 30 min before a training session and trained in two different versions of place avoidance. A control group received saline injections. In an active place avoidance task (hereby referred to as Room+Arena-), this place was fixed to distal room cues, whereas cues from the arena were misleading. Performance thus demanded the on-going segregation of information that engages cognitive coordination. Following the Room+Arena- training, rats were trained in another place avoidance task (hereby referred to as Arena+), which requires focusing on substratal and idiothetic cues from the arena. In this version, a to-be-avoided sector rotated along with the arena in darkness that hid the extramaze cues. The rats given memantine avoided better than the control rats in the Room+Arena- task. In the Arena+ task, both groups had problems with acquiring the task. Subsequently, memantine was withdrawn and both groups relearned Room+Arena- avoidance with a new sector position. In this task, no effect of groups was seen. In conclusion, memantine at a therapeutic dose improved performance in a task that required the segregation of spatial stimuli into coherent subsets.
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Mei Z, Qiu J, Alcon S, Hashim J, Rotenberg A, Sun Y, Meehan WP, Mannix R. Memantine improves outcomes after repetitive traumatic brain injury. Behav Brain Res 2017; 340:195-204. [PMID: 28412305 DOI: 10.1016/j.bbr.2017.04.017] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 01/18/2017] [Accepted: 04/10/2017] [Indexed: 02/03/2023]
Abstract
Repetitive mild traumatic brain injury (rmTBI; e.g., sports concussions) is common and results in significant cognitive impairment. Targeted therapies for rmTBI are lacking, though evidence from other injury models indicates that targeting N-methyl-d-aspartate (NMDA) receptor (NMDAR)-mediated glutamatergic toxicity might mitigate rmTBI-induced neurologic deficits. However, there is a paucity of preclinical or clinical data regarding NMDAR antagonist efficacy in the rmTBI setting. To test whether NMDAR antagonist therapy improves outcomes after rmTBI, mice were subjected to rmTBI injury (4 injuries in 4days) and randomized to treatment with the NMDA antagonist memantine or with vehicle. Functional outcomes were assessed by motor, anxiety/impulsivity and mnemonic behavioral tests. At the synaptic level, NMDAR-dependent long-term potentiation (LTP) was assessed in isolated neocortical slices. At the molecular level, the magnitude of gliosis and tau hyper-phosphorylation was tested by Western blot and immunostaining, and NMDAR subunit expression was evaluated by Western blot and polymerase chain reaction (PCR). Compared to vehicle-treated mice, memantine-treated mice had reduced tau phosphorylation at acute time points after injury, and less glial activation and LTP deficit 1 month after injury. Treatment with memantine also corresponded to normal NMDAR expression after rmTBI. No corresponding protection in behavior outcomes was observed. Here we found NMDAR antagonist therapy may improve histopathological and functional outcomes after rmTBI, though without consistent corresponding improvement in behavioral outcomes. These data raise prospects for therapeutic post-concussive NMDAR antagonism, particularly in athletes and warriors, who suffer functional impairment and neurodegenerative sequelae after multiple concussions.
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Affiliation(s)
- Zhengrong Mei
- Department of Pharmacy, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong Province, 510150, People's Republic of China.
| | - Jianhua Qiu
- Division of Emergency Medicine, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, United States; Harvard Medical School, United States.
| | - Sasha Alcon
- Division of Emergency Medicine, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, United States.
| | - Jumana Hashim
- Division of Emergency Medicine, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, United States.
| | - Alexander Rotenberg
- Harvard Medical School, United States; Department of Neurology, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, United States.
| | - Yan Sun
- Department of Neurology, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, United States.
| | - William P Meehan
- Division of Emergency Medicine, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, United States; Harvard Medical School, United States; The Micheli Center for Sports Injury Prevention, 9 Hope Avenue, Suite 100 Waltham, MA 02453, United States; Sports Concussion Clinic, Division of Sports Medicine, Boston Children's Hospital, United States.
| | - Rebekah Mannix
- Division of Emergency Medicine, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, United States; Harvard Medical School, United States.
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MK-801 and memantine act differently on short-term memory tested with different time-intervals in the Morris water maze test. Behav Brain Res 2016; 311:15-23. [PMID: 27180167 DOI: 10.1016/j.bbr.2016.05.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 05/06/2016] [Accepted: 05/10/2016] [Indexed: 01/25/2023]
Abstract
N-methyl-d-aspartate receptors (NMDARs) play a crucial role in spatial memory formation. In neuropharmacological studies their functioning strongly depends on testing conditions and the dosage of NMDAR antagonists. The aim of this study was to assess the immediate effects of NMDAR block by (+)MK-801 or memantine on short-term allothetic memory. Memory was tested in a working memory version of the Morris water maze test. In our version of the test, rats underwent one day of training with 8 trials, and then three experimental days when rats were injected intraperitoneally with low- 5 (MeL), high - 20 (MeH) mg/kg memantine, 0.1mg/kg MK-801 or 1ml/kg saline (SAL) 30min before testing, for three consecutive days. On each experimental day there was just one acquisition and one test trial, with an inter-trial interval of 5 or 15min. During training the hidden platform was relocated after each trial and during the experiment after each day. The follow-up effect was assessed on day 9. Intact rats improved their spatial memory across the one training day. With a 5min interval MeH rats had longer latency then all rats during retrieval. With a 15min interval the MeH rats presented worse working memory measured as retrieval minus acquisition trial for path than SAL and MeL and for latency than MeL rats. MK-801 rats had longer latency than SAL during retrieval. Thus, the high dose of memantine, contrary to low dose of MK-801 disrupts short-term memory independent on the time interval between acquisition and retrieval. This shows that short-term memory tested in a working memory version of water maze is sensitive to several parameters: i.e., NMDA receptor antagonist type, dosage and the time interval between learning and testing.
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Chang YH, Chen SL, Lee SY, Chen PS, Wang TY, Lee IH, Chen KC, Yang YK, Hong JS, Lu RB. Low-dose add-on memantine treatment may improve cognitive performance and self-reported health conditions in opioid-dependent patients undergoing methadone-maintenance-therapy. Sci Rep 2015; 5:9708. [PMID: 25989606 PMCID: PMC4437025 DOI: 10.1038/srep09708] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 03/03/2015] [Indexed: 01/19/2023] Open
Abstract
An important interaction between opioid and dopamine systems has been indicated, and using opioids may negatively affect cognitive functioning. Memantine, a medication for Alzheimer's disease, increasingly is being used for several disorders and maybe important for cognitive improvement. Opioid-dependent patients undergoing methadone-maintenance-therapy (MMT) and healthy controls (HCs) were recruited. Patients randomly assigned to the experimental (5 mg/day memantine (MMT+M) or placebo (MMT+P) group: 57 in MMT+M, 77 in MMT+P. Those completed the cognitive tasks at the baseline and after the 12-week treatment were analyzed. Thirty-seven age- and gender-matched HCs, and 42 MMT+P and 39 MMT+M patients were compared. The dropout rates were 49.4% in the MMT+P and 26.3% in the MMT+M. Both patient groups' cognitive performances were significantly worse than that of the HCs. After the treatment, both patient groups showed improved cognitive performance. We also found an interaction between the patient groups and time which indicated that the MMT+M group's post-treatment improvement was better than that of the MMT+P group. Memantine, previously reported as neuroprotective may attenuate chronic opioid-dependence-induced cognitive decline. Using such low dose of memantine as adjuvant treatment for improving cognitive performance in opioid dependents; the dose of memantine might be a worthy topic in future studies.
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Affiliation(s)
- Yun-Hsuan Chang
- Department of Psychology, Asia University, Taichung, Taiwan
- Division of Clinical Psychology, Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Psychiatry, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Shiou-Lan Chen
- Department of Neurology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Sheng-Yu Lee
- Department of Psychiatry, National Cheng Kung University Hospital, Tainan, Taiwan
- Department of Psychiatry, Kaohsiung Veteran's General Hospital, Kaohsiung, Taiwan
| | - Po See Chen
- Department of Psychiatry, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Addiction Research Center, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Psychiatry, National Cheng Kung University Hospital, Tainan, Taiwan
| | - Tzu-Yun Wang
- Department of Psychiatry, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Psychiatry, National Cheng Kung University Hospital, Tainan, Taiwan
| | - I. Hui Lee
- Department of Psychiatry, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Psychiatry, National Cheng Kung University Hospital, Tainan, Taiwan
- Department of Psychiatry, National Cheng Kung University Hospital, Dou-Liou Branch, Yunlin, Taiwan
| | - Kao Chin Chen
- Department of Psychiatry, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Psychiatry, National Cheng Kung University Hospital, Tainan, Taiwan
| | - Yen Kuang Yang
- Department of Psychiatry, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Institute of Behavioral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Addiction Research Center, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Psychiatry, National Cheng Kung University Hospital, Tainan, Taiwan
| | - Jau-Shyong Hong
- Neuropharmacology Section, Laboratory of Neurobiology, National Institute of Environmental Health Sciences/National Institutes of Health, Research Triangle Park, NC, USA
| | - Ru-Band Lu
- Division of Clinical Psychology, Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Psychiatry, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Institute of Behavioral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Psychiatry, National Cheng Kung University Hospital, Tainan, Taiwan
- Center for Neuropsychiatric Research, National Health Research Institute, Zhunan, Miaoli County, Taiwan
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MRZ-99030 – A novel modulator of Aβ aggregation: II – Reversal of Aβ oligomer-induced deficits in long-term potentiation (LTP) and cognitive performance in rats and mice. Neuropharmacology 2015; 92:170-82. [DOI: 10.1016/j.neuropharm.2014.12.037] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 11/28/2014] [Accepted: 12/02/2014] [Indexed: 11/21/2022]
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Stuchlik A, Sumiyoshi T. Cognitive deficits in schizophrenia and other neuropsychiatric disorders: convergence of preclinical and clinical evidence. Front Behav Neurosci 2014; 8:444. [PMID: 25566009 PMCID: PMC4275052 DOI: 10.3389/fnbeh.2014.00444] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 12/09/2014] [Indexed: 12/29/2022] Open
Affiliation(s)
- Ales Stuchlik
- Institute of Physiology Academy of Sciences of the Czech Republic , Prague , Czech Republic
| | - Tomiki Sumiyoshi
- National Center of Neurology and Psychiatry, National Center Hospital , Tokyo , Japan
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14
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Lobellová V, Brichtová E, Petrásek T, Valeš K, Stuchlík A. Higher doses of (+)MK-801 (dizocilpine) induced mortality and procedural but not cognitive deficits in delayed testing in the active place avoidance with reversal on the Carousel. Physiol Res 2014; 64:269-75. [PMID: 25317686 DOI: 10.33549/physiolres.932832] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Schizophrenia is a devastating disorder affecting 1 % of the world's population. An important role in the study of this disease is played by animal models. Since there is evidence that acute psychotic episodes can have consequences on later cognitive functioning, the present study has investigated the effects of a single systemic application of higher doses of (+)MK-801 (3 mg/kg and 5 mg/kg) to adult male Long-Evans rats from the Institute's breeding colony on delayed testing in the active place avoidance task with reversal on the Carousel (a rotating arena). Besides significant mortality due to the injections, a disruption of procedural functions in active place avoidance, after the dose 5 mg/kg was observed. It was concluded that Long-Evans rats from our breeding colony do not represent a suitable biomodel for studying the effects of single high-dose NMDA antagonists.
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Affiliation(s)
- V Lobellová
- Institute of Physiology CAS, Prague, Czech Republic.
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15
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Bonnet U, Taazimi B, Borda T, Grabbe HD. Improvement of a Woman’s Alcohol-Related Dementia via Off-label Memantine Treatment. Ann Pharmacother 2014; 48:1371-5. [DOI: 10.1177/1060028014542270] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Objective: To report a case of long-term treatment of moderate alcohol-related dementia (ARD) with memantine. Case Summary: We present the case of a 48-year-old German woman with a long history of alcohol dependence and cognitive impairments, who was diagnosed with moderate ARD (according to ICD-10 criteria) after having ruled out other dementias. Her cognitive functioning improved with off-label use of memantine (up to 20 mg/d) under abstinent conditions. Discontinuation and reinstitution of memantine were associated with a worsening and an improving of her cognitive performance, respectively, which was documented in neuropsychiatric tests. The patient had 2 alcohol relapses during this study. Only the first relapse was associated with discontinuation of memantine and cognitive deterioration. The second relapse happened during receiving of memantine and was not associated with a decline in cognitive functioning. After 16 months of treatment, moderate ARD had been improved to the grade of an amnestic mild cognitive impairment (according to DemTect) and to mild dementia (according to Clinical Dementia Rating Scale), respectively. Discussion: The on-off-on pattern of the memantine treatment supports the assumption that this antidementia agent played a key role in the improvement of ARD. An alcohol relapse did not attenuate the improvement of cognition with memantine. Conclusion: The use of memantine improved cognitive functioning of a female patient with ARD.
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Affiliation(s)
- Udo Bonnet
- Department of Psychiatry, Psychotherapy and Psychosomatics of Evangelisches Krankenhaus Castrop-Rauxel, Castrop-Rauxel, Germany
- University of Duisburg, Essen, Germany
| | - Behnaz Taazimi
- Department of Psychiatry, Psychotherapy and Psychosomatics of Evangelisches Krankenhaus Castrop-Rauxel, Castrop-Rauxel, Germany
| | - Thorsten Borda
- Department of Psychiatry, Psychotherapy and Psychosomatics of Evangelisches Krankenhaus Castrop-Rauxel, Castrop-Rauxel, Germany
| | - Heinz-Dieter Grabbe
- Department of Psychiatry, Psychotherapy and Psychosomatics of Evangelisches Krankenhaus Castrop-Rauxel, Castrop-Rauxel, Germany
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