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On the epileptogenic effects of kainic acid and dihydrokainic acid in the dentate gyrus of the rat

Identifieur interne : 000B76 ( Istex/Corpus ); précédent : 000B75; suivant : 000B77

On the epileptogenic effects of kainic acid and dihydrokainic acid in the dentate gyrus of the rat

Auteurs : S. P. Butcher ; I. Jacobson ; A. Hamberger

Source :

RBID : ISTEX:0937B4C39C60EB3B70AAB175549A3B441D307655

Abstract

The in vivo effects of the acidic amino receptor agonist, kainic acid and the inhibitors of the uptake of glutamate, dihydrokainic acid and threo-3-hydroxyaspartate, on spontaneous activity and perforant path evoked field potentials were examined in the dentate gyrus of the rat. The effect of these compounds on extracellular levels of endogenous amino acids in the hippocampus was assessed simultaneously using in vivo microdialysis. Kainic acid (10–100 μM) and dihydrokainic acid (1–10 mM) both evoked epileptiform activity and an apparent loss of recurrent inhibition (as assessed using the paired-pulse technique). Extracellular increases in taurine, alanine and phosphoethanolamine were noted following administration of kainate (100 μM) and dihydrokainate (1–10 mM). An increase in extracellular glutamate and aspartate was also noted in rats treated with dihydrokainate (100μ-10μM). In contrast, threo-3-hydroxyaspartate did not induce epileptiform activity, suggesting that the epileptogenic effects of dihydrokainate and kainate are not mediated by inhibition of uptake. The effect of the N-methyl-d-aspartate receptor antagonist, d-2-amino-5-phosphonovalerate on these responses was studied. This compound attenuated the epileptiform activity and reversed the apparent loss of recurrent inhibition in response to both kainic acid and dihydrokainic acid. These data suggest that activation of N-methyl-d-aspartate receptors underlies the epileptogenic effects of both compounds, and the possible mechanisms which might be involved in this response are discussed.

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DOI: 10.1016/0028-3908(88)90146-3

Links to Exploration step

ISTEX:0937B4C39C60EB3B70AAB175549A3B441D307655

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<abstract lang="en">The in vivo effects of the acidic amino receptor agonist, kainic acid and the inhibitors of the uptake of glutamate, dihydrokainic acid and threo-3-hydroxyaspartate, on spontaneous activity and perforant path evoked field potentials were examined in the dentate gyrus of the rat. The effect of these compounds on extracellular levels of endogenous amino acids in the hippocampus was assessed simultaneously using in vivo microdialysis. Kainic acid (10–100 μM) and dihydrokainic acid (1–10 mM) both evoked epileptiform activity and an apparent loss of recurrent inhibition (as assessed using the paired-pulse technique). Extracellular increases in taurine, alanine and phosphoethanolamine were noted following administration of kainate (100 μM) and dihydrokainate (1–10 mM). An increase in extracellular glutamate and aspartate was also noted in rats treated with dihydrokainate (100μ-10μM). In contrast, threo-3-hydroxyaspartate did not induce epileptiform activity, suggesting that the epileptogenic effects of dihydrokainate and kainate are not mediated by inhibition of uptake. The effect of the N-methyl-d-aspartate receptor antagonist, d-2-amino-5-phosphonovalerate on these responses was studied. This compound attenuated the epileptiform activity and reversed the apparent loss of recurrent inhibition in response to both kainic acid and dihydrokainic acid. These data suggest that activation of N-methyl-d-aspartate receptors underlies the epileptogenic effects of both compounds, and the possible mechanisms which might be involved in this response are discussed.</abstract>
<subject>
<genre>Keywords</genre>
<topic>field potential</topic>
<topic>perforant path</topic>
<topic>epilepsy</topic>
<topic>acidic amino acids</topic>
<topic>2-amino-5-phosphonovalerate</topic>
<topic>brain dialysis</topic>
<topic>hippocampus</topic>
</subject>
<relatedItem type="host">
<titleInfo>
<title>Neuropharmacology</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>NP</title>
</titleInfo>
<genre type="journal">journal</genre>
<originInfo>
<dateIssued encoding="w3cdtf">198804</dateIssued>
</originInfo>
<identifier type="ISSN">0028-3908</identifier>
<identifier type="PII">S0028-3908(00)X0166-9</identifier>
<part>
<date>198804</date>
<detail type="volume">
<number>27</number>
<caption>vol.</caption>
</detail>
<detail type="issue">
<number>4</number>
<caption>no.</caption>
</detail>
<extent unit="issue pages">
<start>337</start>
<end>450</end>
</extent>
<extent unit="pages">
<start>375</start>
<end>381</end>
</extent>
</part>
</relatedItem>
<identifier type="istex">0937B4C39C60EB3B70AAB175549A3B441D307655</identifier>
<identifier type="DOI">10.1016/0028-3908(88)90146-3</identifier>
<identifier type="PII">0028-3908(88)90146-3</identifier>
<recordInfo>
<recordContentSource>ELSEVIER</recordContentSource>
</recordInfo>
</mods>
</metadata>
<serie></serie>
</istex>
</record>

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