SB 242084 hydrochloride is a 5-HT2C receptor antagonist(pKi=9.0) that displays 158- and 100-fold selectivity over 5-HT2A and 5-HT2B receptors respectively.IC50 value: 9.0(pKi) [1]Target: 5-HT2C antagonistin vitro: SB 242084 had over 100-fold selectivity over a range of other 5-HT, dopamine and adrenergic receptors. In studies of 5-HT-stimulated phosphatidylinositol hydrolysis using SH-SY5Y cells stably expressing the cloned human 5-HT2C receptor, SB 242084 acted as an antagonist with a pKb of 9.3, which closely resembled its corresponding receptor binding affinity [1].in vivo: SB 242084 potently inhibited m-chlorophenylpiperazine (mCPP, 7 mgkg i.p. 20 min pre-test)-induced hypolocomotion in rats, a model of in vivo central 5-HT2C receptor function, with an ID50 of 0.11 mg kg i.p., and 2.0 mg kg p.o. SB 242084 (0.1-1 mg kg i.p.) exhibited an anxiolytic-like profile in the rat social interaction test, increasing time spent in social interaction, but having no effect on locomotion. SB 242084 (0.1-1 mg kg i.p.) also markedly increased punished responding in a rat Geller-Seifter conflict test of anxiety, but had no consistent effect on unpunished responding [1].
TPA-023B is an orally active and high-affinity agonist of the GABAA receptor α2 α3 subtype (Kis: 0.73 nM 2 nM) partial and an antagonist α1 subtype (Ki: 1.8 nM), has non-sedating anxiolytic-like properties.
KRM-II-81 is a γ-Aminobutyric Acid Type A (GABAA) Receptor Ligand. KRM-II-81 exhibits improved anxiolytic-like effects in a mouse marble burying assay and a rat Vogel conflict test.
5α-Androst-16-en-3α-ol is a steroid pheromone that has been found in boar testes and human male axillary sweat and has diverse biological activities.1,2It enhances GABA-activated currents in primary mouse cerebellar granule cells (EC50= 0.4 μM).25α-Androst-16-en-3α-ol (0.1-1 μM) increases the amplitude of GABA-activated currents in HEK293 cells expressing human α1β2γ2and α2β2γ2subunit-containing GABAAreceptors.In vivo, 5α-androst-16-en-3α-ol (5-10 mg kg) decreases immobility time in the forced swim test in mice. It increases time spent in the open arms of the elevated plus maze in mice, indicating anxiolytic-like activity, when administered at doses ranging from 30 to 50 mg kg. 5α-Androst-16-en-3α-ol protects against seizures induced by pentylenetetrazole or electroshock in mice (ED50s = 48.9 and 21.9 mg kg, respectively). 1.Brooksbank, B.W., Brown, R., and Gustafsson, J.A.The detection of 5α-androst-16-en-3α-ol in human male axillary sweatExperientia30(8)864-865(1974) 2.Kaminski, R.M., Marini, H., Ortinski, P.I., et al.The pheromone androstenol (5α-androst-16-en-3α-ol) is a neurosteroid positive modulator of GABAA receptorsJ. Pharmacol. Exp. Ther.317(2)694-703(2006)
TRPC4/5 channel blocker (IC50 values are 3.7-10.3 and 8.2 μM, respectively). Also weakly blocks TRPC3 channels. Exhibits rapid antidepressant and anxiolytic effects in vivo. Zhu et al (2015) Identification and optimization of 2-aminobenzimidazole derivatives as novel inhibitors of TRPC4 and TRPC5 channels. Br.J.Pharmacol. 172 3495 PMID:25816897 |Yang et al (2015) Acute treatment with a novel TRPC4/C5 channel inhibitor produces antidepressant and anxiolytic-like effects in mice. PLoS One 10 e0136255 PMID:26317356
Eltoprazine(DU28853) is a serenic or antiaggressive agent which as an agonist at the 5-HT1A and 5-HT1B receptors and as an antagonist at the 5-HT2C receptor.IC50 value:Target: 5-HT1A 1B agonist; 5-HT2C antagonistin vitro: The binding of [3H]eltoprazine to whole tissue sections was saturable and revealed an apparent dissociation constant (Kd) of 11 nM. Specific [3H]eltoprazine binding was completely displaced by 5-HT; conversely, unlabelled eltoprazine reduced [3H]5-HT binding to the levels of non-specific binding [1]. Eltoprazine evoked membrane changes that were similar to but much weaker than those induced by 5HT. Both the 5HT- and eltoprazine-evoked membrane hyperpolarizations were largely suppressed in the presence of spiperone [2].in vivo: eltoprazine is extremely effective in suppressing dyskinesia in experimental models, although this effect was accompanied by a partial worsening of the therapeutic effect of l-dopa. Interestingly, eltoprazine was found to (synergistically) potentiate the antidyskinetic effect of amantadine. The current data indicated that eltoprazine is highly effective in counteracting dyskinesia in preclinical models [3]. Rats were chronically treated with mianserin (10 mg kg i.p.) or eltoprazine (1 mg kg i.p.) and were tested in the elevated plus-maze test for anxiety. Mianserin and eltoprazine displayed opposite effects in the elevated plus-maze: mianserin induced anxiolytic-like effects, while eltoprazine showed anxiogenic-like ones [4]. [1]. Sijbesma H, et al. Eltoprazine, a drug which reduces aggressive behaviour, binds selectively to 5-HT1 receptor sites in the rat brain: an autoradiographic study. Eur J Pharmacol. 1990 Feb 20;177(1-2):55-66. [2]. Joels M, et al. Eltoprazine suppresses hyperpolarizing responses to serotonin in rat hippocampus. J Pharmacol Exp Ther. 1990 Apr;253(1):284-9. [3]. Bezard E, et al. Study of the antidyskinetic effect of eltoprazine in animal models of levodopa-induced dyskinesia. Mov Disord. 2013 Jul;28(8):1088-96. [4]. Rocha B, et al. Chronic mianserin or eltoprazine treatment in rats: effects on the elevated plus-maze test and on limbic 5-HT2C receptor levels. Eur J Pharmacol. 1994 Sep 1;262(1-2):125-31.
Posovolone (Co 134444), an orally active neuroactive steroid with sedative-hypnotic properties, exhibits anticonvulsant and anxiolytic-like activities, alongside ataxic effects.
NBI-31772 hydrate is a powerful inhibitor of the interaction between insulin-like growth factor (IGF) and IGF-binding proteins (IGFBPs). It acts as a nonpeptide ligand, effectively releasing bioactive IGF-I from the IGF-I IGFBP-3 complex (Ki values for all six human subtypes range from 1-24 nM). This compound demonstrates significant anxiolytic and antidepressant-like effects [1] [2] [3].