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Titolo:
Comparison of excitotoxic profiles of ATPA, AMPA, KA and NMDA in organotypic hippocampal slice cultures
Autore:
Kristensen, BW; Noraberg, J; Zimmer, J;
Indirizzi:
Univ So Denmark, Odense Univ, Med Biol Inst, DK-5000 Odense C, Denmark Univ So Denmark Odense Denmark C ed Biol Inst, DK-5000 Odense C, Denmark Univ So Denmark, Odense Univ, NeuroScreen ApS, DK-5000 Odense, Denmark Univ So Denmark Odense Denmark DK-5000 reen ApS, DK-5000 Odense, Denmark
Titolo Testata:
BRAIN RESEARCH
fascicolo: 1, volume: 917, anno: 2001,
pagine: 21 - 44
SICI:
0006-8993(20011026)917:1<21:COEPOA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
METHYL-D-ASPARTATE; AMINO-ACID RECEPTORS; SPONTANEOUS EPILEPTIFORM ACTIVITY; IONOTROPIC GLUTAMATE RECEPTORS; KAINATE-PREFERRING RECEPTORS; MURINE CORTICAL-NEURONS; KAINIC ACID; RAT HIPPOCAMPUS; CELL-DEATH; IN-VITRO;
Keywords:
propidium iodide; MAP2; NeuN; neurodegeneration; neuroprotection; NBQX; GYKI 52466; MK-801;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
113
Recensione:
Indirizzi per estratti:
Indirizzo: Kristensen, BW Univ So Denmark, Odense Univ, Med Biol Inst, Winslowparken 21, DK-5000 Odense C, Denmark Univ So Denmark Winslowparken 21 Odense Denmark C Denmark
Citazione:
B.W. Kristensen et al., "Comparison of excitotoxic profiles of ATPA, AMPA, KA and NMDA in organotypic hippocampal slice cultures", BRAIN RES, 917(1), 2001, pp. 21-44

Abstract

The excitotoxic profiles of (RS)-2-amino-3-(3-hydroxy-5-tert-butylisoxazol-4-yl)propionic acid (ATPA), (RS)-2-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA), kainic acid (KA) and N-methyl-D-aspartate (NMDA) were evaluated using cellular uptake of propidium iodide (PI) as a measure for induced, concentration-dependent neuronal damage in hippocampal slice cultures. ATPA is in low concentrations a new selective agonist of the glutamate receptor subunit GluR5 confined to KA receptors and also in high concentrations an AMPA receptor agonist. The following rank order of estimated EC50 values was found after 2 days of exposure: AMPA (3.7 mM)> NMDA (11 mM)=KA (13 mM)> ATPA (33 mM). Exposed to 30 muM ATPA, 3 muM AMPA and 10 muM NMDA, CA1 was the most susceptible subfield followed by fascia dentata and CA3. Using 8 muM KA, CA3 was the most susceptible subfield, followed by fascia dentata and CA1. In 100 muM concentrations, all four agonists induced the same,maximal PI uptake in all hippocampal subfields, corresponding to total neuronal degeneration. Using glutamate receptor antagonists, like GYKI 52466, NBQX and MK-801, inhibition data revealed that AMPA excitotoxicity was mediated primarily via AMPA receptors. Similar results were found for a high concentration of ATPA (30 LM). In low GluR5 selective concentrations (0.3-3 muM), ATPA did not induce an increase in PI uptake or a reduction in glutamic acid decarboxylase (GAD) activity of hippocampal interneurons. For KA, the excitotoxicity appeared to be mediated via both KA and AMPA receptors. NMDA receptors were not involved in AMPA-, ATPA- and KA-induced excitotoxicity, nor did NMDA-induced excitotoxicity require activation of AMPA and KA receptors. We conclude that hippocampal slice cultures constitute a feasible test system for evaluation of excitotoxic effects and mechanisms of new (ATPA) and classic (AMPA, KA and NMDA) glutamate receptor agonists. Comparisonof concentration-response curves with calculation of EC50 values for glutamate receptor agonists are possible, as well as comparison of inhibition data for glutamate receptor antagonists. The observation that the slice cultures respond with more in vivo-like patterns of excitotoxicity than primary neuronal cultures, suggests that slice cultures are the best model of choice for a number of glutamate agonist and antagonist studies. (C) 2001 Elsevier Science BY All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 23:05:07