GABA(B) receptors modulate short-term potentiation of spontaneous excitatory postsynaptic currents in the rat supraoptic nucleus in vitro.

Abstract:

:High-frequency stimulation of afferents to the supraoptic nucleus (SON) results in a robust increase in the frequency and amplitude of pharmacologically isolated, tetrodotoxin-resistant, miniature excitatory postsynaptic currents (mEPSCs) lasting for 5-20 min. This increase in mEPSC frequency, termed short-term potentiation (STP), is tightly coupled to increases in action potential firing in magnocellular neurons (MCNs) suggesting a functional role for STP. gamma-Aminobutyric acid (GABA), acting selectively on GABA(B) receptors, has been shown to modulate action potential-dependent EPSCs, as well as mEPSCs in this nucleus. In this study, we examined the role of GABA in STP. Using in vitro hypothalamic slices containing the SON and the nystatin perforated-patch recording technique to record from MCNs, we tested the hypothesis that GABA modulates STP. Baclofen, a GABA(B) receptor agonist, caused a reversible decrease in the frequency of mEPSCs as well as a reduction in the magnitude and duration of STP. GABA(B) receptor antagonists blocked the baclofen-induced decrease in mEPSC frequency and reduction in STP. In addition, the antagonists by themselves increased basal mEPSC frequency while prolonging the duration of STP in most cells. By contrast, picrotoxin, a GABA(A) chloride channel blocker, had no effect on STP.These findings indicate that GABA is tonically present in the SON and its action at the GABA(B) receptor may determine the magnitude and duration of STP.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Kombian SB,Hirasawa M,Matowe WC,Pittman QJ

doi

10.1016/s0028-3908(01)00098-3

subject

Has Abstract

pub_date

2001-10-01 00:00:00

pages

554-64

issue

5

eissn

0028-3908

issn

1873-7064

pii

S0028390801000983

journal_volume

41

pub_type

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