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Br J Pharmacol. 2000 Dec;131(7):1251-4.

Mechanism of action of the hypnotic zolpidem in vivo.

Author information

1
Institute of Pharmacology and Toxicology, University of Zurich, Switzerland. crestani@pharma.unizh.ch

Abstract

Zolpidem is a widely used hypnotic agent acting at the GABA(A) receptor benzodiazepine site. On recombinant receptors, zolpidem displays a high affinity to alpha 1-GABA(A) receptors, an intermediate affinity to alpha(2)- and alpha(3)-GABA(A) receptors and fails to bind to alpha(5)-GABA(A) receptors. However, it is not known which receptor subtype is essential for mediating the sedative-hypnotic action in vivo. Studying alpha1(H101R) mice, which possess zolpidem-insensitive alpha(1)-GABA(A) receptors, we show that the sedative action of zolpidem is exclusively mediated by alpha(1)-GABA(A) receptors. Similarly, the activity of zolpidem against pentylenetetrazole-induced tonic convulsions is also completely mediated by alpha(1)-GABA(A) receptors. These results establish that the sedative-hypnotic and anticonvulsant activities of zolpidem are due to its action on alpha(1)-GABA(A) receptors and not on alpha(2)- or alpha(3)-GABA(A) receptors.

PMID:
11090095
PMCID:
PMC1572473
DOI:
10.1038/sj.bjp.0703717
[Indexed for MEDLINE]
Free PMC Article

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