Article date: 1991/2/25
PubMed ID: 1851269
Journal name: Neuroscience letters (ISSN: 0304-3940)
In order to explore the structural basis of GABAA receptor function, we have expressed murine alpha 1, beta 1, and gamma 2 subunit cDNAs by transient transfection of human 293 cells. Expression of GABAA receptors was measured by ligand binding assay and by electrophysiological analysis. As in other species, expression of the alpha 1 and beta 1 subunits produced a receptor that was insensitive to modulation by benzodiazepines as measured by electrophysiological analysis; however, a small number of flunitrazepam binding sites were detectable. The coexpression of the gamma 2 subunit was found to be essential for this modulation, and also resulted in a dramatic (14-fold) increase in the number of binding sites for flunitrazepam. On the coexpression of all 3 subunit cDNAs, a receptor was produced that exhibited a similar number of binding sites for flunitrazepam and muscimol.
Author List: Moss S J, Ravindran A, Mei L, Wang J B, Kofuji P, Huganir R L, Burt D R
Publication Types: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.
Substances mentioned in the article: Ligands; Receptors, GABA-A; Recombinant Proteins; Muscimol; gamma-Aminobutyric Acid; Flunitrazepam; DNA;
Mesh terms: Animals; Binding Sites; Cell Line; DNA/genetics; Electrophysiology; Flunitrazepam/metabolism; Humans; Ligands; Mice; Muscimol/metabolism; Receptors, GABA-A/metabolism; Recombinant Proteins; Transfection; gamma-Aminobutyric Acid/pharmacology;