Deramciclane (EGIS-3886)

Animal experiment:

Mice[2] Male Wistar rats are used. Samples for determination of basal levels of dopamine, DOPAC and HVA are collected for 60 min. and after that the drugs (doses refer to the salts) are given intraperitoneally in a volume of 5 mL/kg of body weight. Treatments are Deramciclane fumarate 3 mg/kg (=7.2 µmol/kg), 10 mg/kg (=24 µmol/kg) and 30 mg/kg (=72 µmol/kg); D-amphetamine sulfate 2 mg/kg (=5.4 µmol/kg); Ritanserin 1 mg/kg (=2.1 µmol/kg) and Buspirone hydrochloride 5 mg/kg (=12 µmol/kg). All drugs are suspended in 0.5% carboxymethylcellulose (CMC) dissolved in 0.9% saline. Vehicle control group (n=5) are injected intraperitoneally with 5 mL/kg of 0.5% CMC solution. There are nine rats in each treatment group.The doses of Deramciclane fumarate are considered to produce plasma levels comparable to therapeutic plasma levels in human beings (3 mg/kg) or about three times higher (10 mg/kg) 1-3 hr after the administration of the drug. Behavioural data from earlier Deramciclane studies in rats indicates that Deramciclane has some antidopaminergic activity at high doses (20-40 mg/kg). The highest dose of Deramciclane (30 mg/kg) is selected in this dose range. Fairly high doses of the reference drugs are chosen based on the literature and our own experience to detect the ability of selected drugs to modify extracellular dopamine levels in either the striatum or the nucleus accumbens. After administration of each drug, samples are collected for 240 min. and then divided into two aliquots (35 µL/15 µL). The first aliquot of the samples is stored at 4°C and assayed for dopamine within 24 hr. The other aliquot is frozen and stored at -70°C until assayed for DOPAC and HVA.

References:

[1]. P lvim ki EP, et al. Deramciclane, a putative anxiolytic drug, is a serotonin 5-HT2C receptor inverse agonist but fails to induce 5-HT2C receptor down-regulation. Psychopharmacology (Berl). 1998 Mar;136(2):99-104.
[2]. K~ ri inen TM, et al. Comparison of the effects of deramciclane, ritanserin and buspirone on extracellular dopamine and its metabolites in striatum and nucleus accumbens of freely moving rats. Basic Clin Pharmacol Toxicol. 2008 Jan;102(1):50-8.