当前位置： SCI文献检索 > EUROPEAN JOURNAL OF PHARMACOLOGY期刊下所有文献 > Allosteric interactions between gamma-aminobutyric acid, benzodiazepine and picrotoxinin binding sites in primary cultures of cerebellar granule cells. Differential effects induced by gamma- and delta-hexachlorocyclohexane.

Allosteric interactions between gamma-aminobutyric acid, benzodiazepine and picrotoxinin binding sites in primary cultures of cerebellar granule cells. Differential effects induced by gamma- and delta-hexachlorocyclohexane.

Abstract：

:Allosterism between gamma-aminobutyric acid (GABA), benzodiazepine and picrotoxinin recognition sites on the GABAA receptor was studied in primary cultures of cerebellar granule cells. The increase in [3H]flunitrazepam binding induced by GABA was inhibited by bicuculline and picrotoxinin and the decrease in [35S]t-butylbicyclophosphorothionate ([35S]TBPS) binding mediated by GABA was reverted by bicuculline. The effects of hexachlorocyclohexanes (the convulsant gamma- and the depressant delta-isomers, both acting at the picrotoxinin recognition site) on GABA and benzodiazepine sites were studied. delta-Hexachlorocyclohexane, but not the gamma-isomer (lindane), increased [3H]flunitrazepam binding in a concentration-dependent manner (EC50: 8.3 microM). This increase in [3H]flunitrazepam binding was reduced by bicuculline and picrotoxinin. The gamma-isomer reduced the increase in [3H]flunitrazepam binding induced by GABA or delta-hexachlorocyclohexane. Neither delta- nor gamma-hexachlorocyclohexane inhibited [3H]GABA binding. Moreover, the inhibition of [35S]TBPS binding induced by delta-hexachlorocyclohexane was not reverted by bicuculline. The results obtained in this study in vitro agree with the pharmacological properties and the effects of gamma- and delta-hexachlorocyclohexane in vivo. It is concluded that delta-hexachlorocyclohexane acts as a positive allosteric modulator and gamma-hexachlorocyclohexane acts as a non-competitive antagonist of the GABAA receptor.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Vale C,Pomés A,Rodríguez-Farré E,Suñol C

doi

10.1016/s0014-2999(96)00866-7

subject

Has Abstract

pub_date

1997-01-29 00:00:00

pages

343-53

issue

2-3

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(96)00866-7

journal_volume

319

pub_type

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