CGP 55845A blocks baclofen, gamma-aminobutyric acid and inhibitory postsynaptic potassium currents in guinea pig CA3 neurons.

Abstract:

:Single electrode voltage-clamp recording from CA3 neurons in guinea pig hippocampal slices was applied to study effects of a new GABAB antagonist, CGP 55845A, on (-)baclofen (IBac)- or gamma-aminobutyric acid (IGABA)-induced potassium (K)-currents and on inhibitory postsynaptic K-currents (K-IPSCs) recorded in the presence of blockers for fast synaptic transmission. K-IPSCs were induced by bath application of 4-amino-pyridine (4-AP). CGP 55845A, in 10(-8) to 10(-7) M concentrations, blocked all these K-currents and was more potent than all GABAB antagonists known to date. However, onset of the CGP 55845A effect and recovery were slow. We conclude that a potent and selective GABAB antagonist is now available to study the physiological role of GABAB receptors in the mammalian brain.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Jarolimek W,Demmelhuber J,Bijak M,Misgeld U

doi

10.1016/0304-3940(93)90164-g

subject

Has Abstract

pub_date

1993-05-14 00:00:00

pages

31-4

issue

1-2

eissn

0304-3940

issn

1872-7972

pii

0304-3940(93)90164-G

journal_volume

154

pub_type

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