Agomelatine (hydrochloride)

Agomelatine hydrochloride (S-20098 hydrochloride) is a specific agonist of MT1 and MT2 receptors with K_is of 0.1, 0.06, 0.12, and 0.27 nM for CHO-hMT1, HEK-hMT1, CHO-hMT2, and HEK-hMT2, respectively^[1]. Agomelatine hydrochloride is a selective 5-HT2C receptor antagonist with pK_is of 6.4 and 6.2 at native (porcine) and cloned, human 5-HT2C receptors, respectively^[2]. IC50 & Target:Ki: 0.1 nM (CHO-hMT1), 0.06 nM (HEK-hMT1), 0.12 nM (CHO-hMT2), and 0.27 nM (HEK-hMT2)^[1]
pKi: 6.4 (native porcine 5-HT2C receptor), 6.2 (human 5-HT2C receptor)^[2] In Vitro: Agomelatine (S 20098) acts as a full agonist of MT1 and MT2 receptors with EC₅₀s of 1.6±0.4, 0.10±0.04 nM for CHO hMT1 CHO-hMT2 (hΜΤ1 and hΜΤ2 receptors expressed in CHO or HEK cell membranes)^[1].
Agomelatine (S20098) also interacts with h5-HT2B receptors (6.6), whereas it shows low affinity at native (rat)/cloned, human 5-HT2A (<5.0/5.3) and 5-HT1A (<5.0/5.2) receptors, and negligible (<5.0) affinity for other 5-HT receptors^[2]. In Vivo: Agomelatine (25, 50, or 75 mg/kg; i.p.) has antioxidant activity in Strychnine (75 mg/kg, i.p.) or Pilocarpine (400 mg/kg, i.p.) induced seizure models in mice. Agomelatine dose not have any antioxidant effects on parameters of oxidative stress produced by Pentylenetetrazole (PTZ) or Picrotoxin (PTX) induced seizure models when compared to controls^[3].