VU0810464(VU 0810464

VU0810464 (VU 0810464, VU464) is a selective neuronal GIRK channels activator, displays nanomolar potency for GIRK1/2 (EC50=163 nM) and improved brain penetration; exhibits comparable efficacy and potency compared with ML297, but VU0810464 is more selective for neuronal GIRK channels (GIRK1/4 EC50>500 nM); displays >3-fold more potent on GIRK1/2-expressing HEK293 cells compared to GIRK1/4-expressing cells, as measured using a Tl+ flux assay; reduced stress-induced hyperthermia in a GIRK-dependent manner in mice, ML297, but not VU0810464, decreased anxiety-related behavior as assessed with the elevated plus maze test.

Research Areas >> Neurological Disease

Signaling Pathways >> Membrane Transporter/Ion Channel >> Potassium Channel

EC50: 165 nM (GIRK 1/2); 720 nM (GIRK1/4 )[1][2]

VU0810464 (0, 0.1, 0.3, 1, 3, 10, 30 μM) produces a concentration‐dependent response curves of currents in SAN and HPC cells, in addition, VU0810464 is 9‐fold higher potency for Kir3 channel activation in neurons as compared to SAN cells[2].

VU0810464 (intraperitoneal injection; 30 mg/kg, 10 mg/kg; 30mg/kg; pre-treated 30 mins) produces a dose-dependent reduction of SIH response in Male C57BL/6J mice. To test if VU0810464 plays it role through Kir3 channel activation, VU0810464 (10 mg/kg) suppresses the SIH response in wild‐ type mice, but has no impact on Kcnj3−/− mice[2]. VU0810464 (intraperitoneal injection ; 30 mg/kg; 15, 30, 45, or 60 min post‐injection) displays a favourable distribution to the brain (Kp,uu = 0.83), has a improvement over ML297 (Kp,uu= 0.32). Clearance of VU0810464 is rapid,brain and plasma half-lives is 20 min in a PK study[2]. Animal Model: Male C57BL/6J mice, Kcnj3−/− siblings female and male C57BL/6J mice Dosage: 10 mg/kg; 30mg/kg Administration: Intraperitoneal injection Result: Reduced stress‐induced hyperthermia (SIH), a physiological test ofanxiolytic efficacy in wild mice, but had no impact in and Kcnj3 (Girk1) −/− mice.

[1]. Vo BN, et al. VU0810464, a non-urea G protein-gated inwardly rectifying K+ (Kir 3/GIRK) channel activator, exhibits enhanced selectivity for neuronal Kir 3 channels and reduces stress-induced hyperthermia in mice.Br J Pharmacol. 2019 Jul;176(13):2238-2249.

[2]. Wieting JM,et al. Discovery and Characterization of 1H-Pyrazol-5-yl-2-phenylacetamides as Novel, Non-Urea-Containing GIRK1/2 Potassium Channel Activators.ACS Chem Neurosci. 2017 Sep 20;8(9):1873-1879.