tcsc0859 Asenapine (maleate)

Asenapine maleate is a 5-HT (1A, 1B, 2A, 2B, 2C, 5A, 6, 7) and D2 antagonist with K_i values of 0.03-4.0 nM, 1.3nM, respectively, and an antipsychotic.

IC50 & Target: Ki: 0.03-4.0 nM (5-HT), 1.3 nM (D2)^[1].

In Vitro: Relative to its D2 receptor affinity, asenapine has a higher affinity for 5-HT_2C, 5-HT_2A, 5-HT_2B, 5-HT₇, 5-HT₆, α_2B and D3 receptors, suggesting stronger engagement of these targets at therapeutic doses. Asenapine behaves as a potent antagonist (pK_B) at 5-HT1A (7.4), 5-HT1B (8.1), 5-HT_2A (9.0), 5-HT_2B (9.3), 5-HT_2C (9.0), 5-HT₆ (8.0), 5-HT₇ (8.5), D2 (9.1), D3 (9.1), α_2A (7.3), α_2B (8.3), α_2C (6.8) and H1 (8.4) receptors^[2].

In Vivo: Asenapine is an atypical antipsychotic that is currently available for the treatment of schizophrenia and bipolar I disorder. Asenapine may have superior therapeutic effect on anxiety symptoms than other agents in rats^[3]. Asenapine has anxiolytic-like effects in the EPM and the defensive marble burying tests in mice^[4].