| References: |
ABT-639 is a novel, peripherally acting, selective T-type Ca2+ channel blocker. ABT-639 blocks recombinant human T-type (Cav3.2) Ca2+ channels in a voltage-dependent fashion (IC50 = 2 μM) and attenuates LVA currents in rat DRG neurons (IC50 = 8 μM).
in vitro: ABT-639 is significantly less active at other Ca2+ channels (e.g. Cav1.2 and Cav2.2) (IC50 > 30 μM). ABT-639 has high oral bioavailability (%F = 73), low protein binding (88.9%) and a low brain:plasma ratio (0.05:1) in rodents.
in vivo: Following oral administration ABT-639 produces dose-dependent antinociception in a rat model of knee joint pain (ED50 = 2 mg/kg, p.o.). ABT-639 (10-100 mg/kg, p.o.) also increases tactile allodynia thresholds in multiple models of neuropathic pain. The antinociceptive profile of ABT-639 provides novel insights into the role of peripheral T-type (Cav3.2) channels in chronic pain states. |
