Cited by 29Neuroscience and Neuropharmacology ResearchAmino Acid Enzymes and MetabolismPharmacological Receptor Mechanisms and Effects

The metabotropic glutamate receptor agonist 1S,3R-ACPD stimulates and modulates NMDA receptor mediated excitotoxicity in organotypic hippocampal slice cultures

Blaabjerg, Morten, Kristensen, Bjarne W., Bonde, Christian, Zimmer, Jens·2001·Brain Research

Abstract

The potential toxic effects of the metabotropic glutamate receptor agonist (1S,3R)-1-aminocyclopentane-1,3-dicarboxylic acid (ACPD) and its interactions with the N-methyl-D-aspartate (NMDA) receptor were studied in hippocampal brain slice cultures, using densitometric measurements of the cellular uptake of propidium iodide (PI) to quantify neuronal degeneration. Cultures exposed to ACPD, showed a concentration (2-5 mM) and time (1-4 days) dependent increase in PI uptake in CA1, CA3 and dentate subfields after 24 h and 48 h of exposure, with CA1 pyramidal cells being most sensitive. The neurodegeneration induced by 2 mM ACPD was completely abolished by addition of 10 microM of the NMDA receptor antagonist (5R,10S)-(+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5,10-imine (MK-801), while 20 microM of the 2-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA)/kainic acid receptor antagonist 2,3-dioxo-6-nitro-1,2,3,4-tetrahydrobenzo[f]quinoxaline-7-sulfonamide (NBQX) had no effect. Co-exposing cultures to a subtoxic dose of 300 microM ACPD together with 10 microM NMDA, which at this dose is known to induce a fairly selective degeneration of CA1 pyramidal cells, significantly increased the PI uptake in both CA1 and CA3, compared to cultures exposed to 10 microM NMDA only. Adding the 300 microM ACPD as pretreatment for 30 min followed by a 30 min wash in normal medium before the ACPD/NMDA co-exposure, eliminated the potentiation of NMDA toxicity. The potentiation was also blocked by addition of 10 or 100 microM 2-methyl-6-(phenylethynyl)pyridine (MPEP) (mGluR5 antagonist) during the co-exposure, while a corresponding addition of 10 or 100 microM 7-(hydroxyimino)cyclopropa[b]chromen-1a-carboxylate ethyl ester (CPCCOEt) (mGluR1 antagonist) had no effect. We conclude that, stimulation of metabotropic glutamate receptors with ACPD at concentrations of 2 mM or higher induces a distinct subfield-related and time and concentration dependent pattern of hippocampal degeneration, and that ACPD at subtoxic concentrations modulates NMDA-induced excitotoxicity through the mGluR5 receptor in a time dependent way.

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Crossref · 10.1016/s0006-8993(01)02148-5

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Authors
Blaabjerg, M., Kristensen, B. W., Bonde, C., & Zimmer, J.
Affiliations
University of Southern Denmark (DK)
Corresponding author
Blaabjerg, Morten
Venue
Brain Research
Publisher
Elsevier BV
Published
2001-04
Volume
898
Issue
1
Pages
91-104
ISSN
0006-8993 (ISSN-L)
OpenAlex
W1976599886
Cited by
29
References
50
Citations by year
2015: 1 · 2014: 2
FWCI
1.47
Type
journal article
Language
en
Open access
closed
Locations
  • Brain Research (publishedVersion)
  • PubMed (publishedVersion)
  • University of Southern Denmark Research Portal (University of Southern Denmark) (publishedVersion)
Funders
Medical Research Council
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pharmacological Receptor Mechanisms and Effects
Keywords
metabotropic glutamate receptor agonist, 1S,3R-ACPD, NMDA receptor, excitotoxicity, hippocampal slice cultures, neurodegeneration, CA1 pyramidal neurons, MK-801, NBQX, MPEP, mGluR5, mGluR1, mGluR2, mGluR3, mGluR4, mGluR6, mGluR7, mGluR8, neuroprotection
MeSH terms
Animals, Cycloleucine, Coloring Agents, Hippocampus, Immunohistochemistry, Microtubule-Associated Proteins, Nerve Tissue Proteins, Neurotoxins, Propidium, Quinoxalines, Staining and Labeling, Receptors, N-Methyl-D-Aspartate, N-Methylaspartate, Dizocilpine Maleate, Rats, Wistar, Receptors, Metabotropic Glutamate, Excitatory Amino Acid Agonists, Excitatory Amino Acid Antagonists, Rats, In Vitro Techniques

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