Differing actions of baclofen and 3-amino-propylphosphinic acid in rat neocortical slices.

Abstract:

:Rat neocortical slices maintained in Mg2(+)-free Krebs medium developed spontaneous paroxysmal discharges which were attenuated or suppressed by the gamma-aminobutyric acid-B (GABAB) receptor agonist baclofen, occasionally accompanied by a slight hyperpolarisation, and antagonised by the specific GABAB-receptor antagonist, 2-OH-saclofen. Over the same dose range, the GABA-analogue 3-amino-propylphosphinic acid (3-APA) caused a marked, prompt hyperpolarisation with little or no effect on the frequency of the discharges, although their amplitude was attenuated. In the presence of 2-OH-saclofen, 3-APA still induced a hyperpolarisation but the amplitude of the discharges was no longer affected. This marked difference in action between baclofen and 3-APA in the rat neocortical slices suggests there may be a heterogeneity of GABAB-receptors.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Ong J,Kerr DI,Johnston GA,Hall RG

doi

10.1016/0304-3940(90)90557-p

subject

Has Abstract

pub_date

1990-02-05 00:00:00

pages

169-73

issue

1-2

eissn

0304-3940

issn

1872-7972

pii

0304-3940(90)90557-P

journal_volume

109

pub_type

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