Cited by 404Alzheimer's disease research and treatmentsNeuroscience and Neuropharmacology ResearchDementia and Cognitive Impairment Research

The NMDA receptor antagonist memantine as a symptomatological and neuroprotective treatment for Alzheimer's disease: preclinical evidence

Danysz, Wojciech, Parsons, Chris G.·2003·International Journal of Geriatric Psychiatry

Abstract

There is increasing evidence for the involvement of glutamate-mediated neurotoxicity in the pathogenesis of Alzheimer's disease (AD). We suggest that glutamate receptors of the N-methyl-D-aspartate (NMDA) type are overactivated in a tonic rather than a phasic manner in this disorder. This continuous mild activation may lead to neuronal damage and impairment of synaptic plasticity (learning). It is likely that under such conditions Mg(2+) ions, which block NMDA receptors under normal resting conditions, can no longer do so. We found that overactivation of NMDA receptors using a direct agonist or a decrease in Mg(2+) concentration produced deficits in synaptic plasticity (in vivo: passive avoidance test and/or in vitro: LTP in the CA1 region). In both cases, memantine-an uncompetitive NMDA receptor antagonists with features of an 'improved' Mg(2+) (voltage-dependency, kinetics, affinity)-attenuated this deficit. Synaptic plasticity was restored by therapeutically-relevant concentrations of memantine (1 microM). Moreover, doses leading to similar brain/serum levels provided neuroprotection in animal models relevant for neurodegeneration in AD such as neurotoxicity produced by inflammation in the NBM or beta-amyloid injection to the hippocampus. As such, if overactivation of NMDA receptors is present in AD, memantine would be expected to improve both symptoms (cognition) and to slow down disease progression because it takes over the physiological function of magnesium.

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Registry

Crossref · 10.1002/gps.938

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49 of 49 references verified0 citation errors · 0 not checkable

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  • Memantine has been used clinically to treat AD patients, and its beneficial effects may be explained by partial antagonism of NMDAR activity.

    “Notably, a NMDA antagonist, memantine, has been used clinically to treat AD patients. The beneficial effects of memantine may be explained partial antagonism of NMDAR activity [70].”

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Authors
Danysz, W., & Parsons, C. G.
Affiliations
Merz (Germany) (DE)
Corresponding author
Danysz, Wojciech
Venue
International Journal of Geriatric Psychiatry
Publisher
Wiley
Published
2003
Volume
18
Issue
S1
Pages
S23-S32
ISSN
  • 0885-6230 (ISSN-L)
  • 1099-1166
OpenAlex
W2117396078
Cited by
404
References
49
Citations by year
2026: 10 · 2025: 15 · 2024: 20 · 2023: 20 · 2022: 18 · 2021: 18 · 2020: 19 · 2019: 16 · 2018: 11 · 2017: 10 · 2016: 14 · 2015: 17 · 2014: 21 · 2013: 17 · 2012: 16
FWCI
2.13
Type
journal article
Language
en
Open access
closed
Locations
  • International Journal of Geriatric Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
memantine, Alzheimer's disease, NMDA receptor antagonism, glutamate excitotoxicity, magnesium, synaptic plasticity, long-term potentiation, hippocampal CA1, neuroprotection, amyloid-beta, neuroinflammation, cognitive impairment
MeSH terms
Aged, Alzheimer Disease, Drug Evaluation, Preclinical, Humans, Memantine, Neuronal Plasticity, Receptors, N-Methyl-D-Aspartate, Excitatory Amino Acid Antagonists, Neuroprotective Agents

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