Immortalized hypothalamic GT1-7 neurons express functional gamma-aminobutyric acid type A receptors.

Abstract:

:Neuronal cell lines provide a source of pure populations of neurons and allow the properties of many neurotransmitter receptors to be studied. However, none of these cells have been reported to express functional gamma-aminobutyric acid (GABA)A receptors. Indeed, there have been no reports of cell lines expressing functional amino acid receptors. Using biochemical and electrophysiological techniques, we have identified a neuronal cell line expressing functional GABAA receptors. Membranes from immortalized hypothalamic (GT1-7) neurons bound [3H]muscimol but not [3H]flunitrazepam. GABA-activated chloride currents, recorded from GT1-7 cells, were blocked by bicuculline and Zn2+ but were insensitive to diazepam. These results suggest that GABAA receptors on GT1-7 cells lack gamma subunits. The neurosteroid 5 alpha-pregnan-3 alpha-ol-20-one and pentobarbital both modulated GABAA receptors in these cells. Polymerase chain reaction analysis of the cells revealed the presence of mRNAs encoding alpha 1, beta 1, and beta 3 polypeptides. GT1-7 cells provide a useful model system for studying the regulation of GABAA receptor polypeptide expression.

journal_name

Mol Pharmacol

journal_title

Molecular pharmacology

authors

Hales TG,Kim H,Longoni B,Olsen RW,Tobin AJ

keywords:

subject

Has Abstract

pub_date

1992-08-01 00:00:00

pages

197-202

issue

2

eissn

0026-895X

issn

1521-0111

journal_volume

42

pub_type

杂志文章