Identification of the GABAA receptor alpha 3 subunit in the IMR-32 neuroblastoma cell line.

Abstract:

:A previous report has described the presence of t-[35S]-butylbicyclophosphorothionate binding sites and GABA-gated Cl- flux in the human neuroblastoma IMR-32 cell line. We now report the further characterisation of this binding site and, even more important, the identification of the GABAA receptor alpha 3 sub-unit expressed in these cells. Cell membranes prepared from IMR-32 cells were screened by immunoblotting for reactivity with various GABAA receptor alpha subunit-specific antibodies. Of these, only anti-Cys alpha 3 454-467 antibodies recognised specifically and in a dose-dependent manner an immunoreactive band. This M(r) 58,000 immunoreactive species and the N-deglycosylated derivatives were both coincident with the respective homologues found in both calf cerebral cortex membranes and purified receptor preparations. This is the first report of the identification of a specific GABAA receptor subunit expressed in a human cell line, and it therefore provides a convenient model for the study of receptor structure and regulation.

journal_name

J Neurochem

authors

Noble PJ,Anderson SM,De Souza RJ,Cross AJ,Stephenson FA

doi

10.1111/j.1471-4159.1993.tb02182.x

subject

Has Abstract

pub_date

1993-08-01 00:00:00

pages

752-5

issue

2

eissn

0022-3042

issn

1471-4159

journal_volume

61

pub_type

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