Effects of pentobarbital on GABA-activated currents in acutely-isolated rat dentate gyrus granule neurons.

Abstract:

:Granule neurons from the rat dentate gyrus were acutely isolated and whole-cell currents recorded. Maximal enhancement of 7 microM gamma-aminobutyric acid (GABA; EC30) evoked currents was obtained with 100 microM pentobarbital where the peak-current was 2.1+/-0.2 of control. One hundred microM pentobarbital alone evoked no current response whereas 1 mM pentobarbital elicited a current response that was 0.4+/-0.2 of the 100 microM GABA-activated peak current. In 100 microM pentobarbital, the GABA EC50 value shifted from 14 to 3 microM but the peak-saturating-current value was not altered. An off-current was recorded on removal of 100 microM and higher pentobarbital concentrations. Ten mM pentobarbital abolished the peak-current response to 7 and 100 microM GABA. The results show that in the granule neurons the drug potency differs for the different effects of pentobarbital at GABAA receptors with the modulatory and inhibitory effects requiring lower concentrations than the direct activation of the receptors.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Lim MS,Lindquist CE,Birnir B

doi

10.1016/j.neulet.2003.09.025

keywords:

subject

Has Abstract

pub_date

2003-12-19 00:00:00

pages

139-42

issue

2

eissn

0304-3940

issn

1872-7972

pii

S0304394003011200

journal_volume

353

pub_type

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