In vitro study | A- 803467 effectively blocked the recombinant human or rat Nav1.8 channel with an IC50 of 8 nM and 45 nM, respectively, maintaining A potential of -40 mV. At the resting potential, A- 803467 also effectively blocks the human Nav1.8 pathway with an IC50 of 79 nM. A- 803467 blocked the current of anti-Tetrodotoxin(TTX-R) in rat dorsal root ganglion neurons in A concentration-dependent manner, with an IC50 of 140 nM, which was higher than that of Mexiletine and Lamotrigine(IC50>30 μm). More effective. A- 803467 was 300 to 1000-fold more selective for hNav1.8 than hNav1.2, hNav1.3, hNav1.5, and hNav1.7 channels, with IC50 values of 7.38 μm, 2.45 μm, and 7.34 μm, respectively, and 6.74 μm. A- 803467 acts on peripheral sensory neuron channels and receptors, including TRPV1, P2X2/3, Cav2.2 and KCNQ2/3 channels, with no significant activity, IC50>10 μm. A- 803467 of 0.3 μm, but not 0.1 μm, Significantly Inhibited Spontaneous and electrically stimulated evoked action potential production. A- 803467 effectively blocked recombinant human or rat Na v 1.8 channels with an IC50 of 8 nM and 45 nM, respectively, maintaining A potential of -40 mV. At the resting potential, A- 803467 also effectively blocks the human Na v 1.8 pathway, The IC50 was 79 nM. A- 803467 blocked the current of anti-Tetrodotoxin(TTX-R) in rat dorsal root ganglion neurons in A concentration-dependent manner, with an IC50 of 140 nM, which was higher than that of Mexiletine and Lamotrigine(IC50>30 μm). More effective. The channel selectivity of A- 803467 for hNa v 1.8 is 1.2-to 1.3-fold higher than that for hNa v 1.5, hNa v 1.7, hNa v 300, and hNa v 1000, with an IC50 of 7.38 μm, 2.45 M, 7.34 M, and 6.74 M. A- 803467 acts on peripheral sensory neuron channels and receptors, including TRPV1, P2X 2/3, Ca v 2.2 and KCNQ2/3 channels, with no significant activity, IC50>10 μm. A- 803467 of 0.3 μm, but not 0.1 μm, Significantly Inhibited Spontaneous and electrically stimulated evoked action potential production. |
In vivo study | Consistent with the in vitro effect on neuronal action potential electrogenesis, A- 803467 spinal nerve ligation rats were intravenously administered at a dose of 20 mg/kg, spontaneous and von Frey hair-induced wide dynamic range neurons in the spinal dorsal horn were significantly reduced by 66% and 53%, respectively. A- 803467 acts on A variety of rat pain models, including spinal nerve ligation (ED50=47 mg/kg, intraperitoneal injection), sciatic nerve injury (ED50=85 mg/kg, intraperitoneal injection), secondary mechanical allodynia induced by capsaicin (ED50 ≈ 100 mg/kg, I. P.) and thermal hyperalgesia induced by complete plantar injection of Freund's adjuvant (ED50=41 mg/kg, intraperitoneal injection), also reduce mechanical pain, this effect is dose dependent. A- 803467 had no activity on formalin-induced injury and acute heat and post-operative pain, as well as on the chemotherapy-induced pain model (Vincristine). consistent with the electrogenesis of action potential of neurons in vitro, A- 803467 spinal nerve ligation rats were intravenously injected at a dose of 20 mg/kg, spontaneous and von Frey hair-induced wide dynamic range neurons in the spinal dorsal horn were significantly reduced by 66% and 53%, respectively. A- 803467 acts on A variety of rat pain models, including spinal nerve ligation (ED50=47 mg/kg, intraperitoneal injection), sciatic nerve injury (ED50=85 mg/kg, intraperitoneal injection), secondary mechanical allodynia induced by capsaicin (ED50 ≈ 100 mg/kg, I. P.) and thermal hyperalgesia induced by complete plantar injection of Freund's adjuvant (ED50=41 mg/kg, intraperitoneal injection), also reduce mechanical pain, this effect is dose dependent. A- 803467 had no activity on formalin-induced injury and acute heat and post-operative pain, as well as on the chemotherapy-induced pain model (Vincristine). |