Imepitoin

AWD 131-138(Imepitoin) is a new low-affinity partial benzodiazepine receptor agonist with potent anticonvulsant and anxiolytic properties in rodent models.IC50 Value: Target: GABA receptorin vitro: AWD 131-138 dose-dependently stimulated GABA currents(Recombinant gamma-aminobutyric acid A (GABA(A)) receptors of the subunit compositions alpha1beta2gamma2, alpha1beta3gamma2, alpha2beta2gamma2, alpha3beta2gamma2 and alpha5beta2gamma2). At 10 microM AWD 131-138, this allosteric stimulation amounted in average to about 12-21% of the maximal stimulation achieved using diazepam. The threshold of stimulation was about 0.3-1.0 microM [1]. in vivo: AWD 131-138 did not produce midazolam-like responding or alter response rates at cumulative doses up to 18.0 mg/kg i.m. (plasma levels over 2100 ng/ml). When AWD 131-138 (10-100 microg/kg/injection) was studied by substitution, responding declined to vehicle substitution levels within three sessions. At the dose of 100 microg/kg i.v. AWD 131-138, sufficient drug was self-administered during the first session (about 3.5 mg/kg) to produce plasma levels above 1000 ng/ml, yet responding over the next two sessions dropped to vehicle levels [2]. Prolonged oral administration with twice-daily dosing of ELB 138 with either 5 or 40 mg/kg over a 5-week period was not associated with loss of anticonvulsant efficacy in the PTZ dog model [3].

Signaling Pathways >> Membrane Transporter/Ion Channel >> GABA Receptor

Signaling Pathways >> Neuronal Signaling >> GABA Receptor

Research Areas >> Neurological Disease

[1]. Sigel E, et al. The antiepileptic drug AWD 131-138 stimulates different recombinant isoforms of the rat GABA(A) receptor through the benzodiazepine binding site. Neurosci Lett. 1998 Apr 3;245(2):85-8.

[2]. Yasar S, et al. Evaluation of the novel antiepileptic drug, AWD 131-138, for benzodiazepine-like discriminative stimulus and reinforcing effects in squirrel monkeys. Eur J Pharmacol. 2003 Apr 4;465(3):257-65.

[3]. Loscher W, et al. Anticonvulsant efficacy of the low-affinity partial benzodiazepine receptor agonist ELB 138 in a dog seizure model and in epileptic dogs with spontaneously recurrent seizures. Epilepsia. 2004 Oct;45(10):1228-39.

(+)-Bicuculline | Picrotoxin | Aminooxyacetic acid hemihydrochloride | Riluzole | Baclofen | basmisanil | (R)-Baclofen | Etifoxine | Etomidate | Ginkgolide A | NS-11394 | 5alpha-Pregnan-3alpha-ol-20-one | CGP 52432 | L-655,708 | SAGE-217