研究槲皮素(Que)对大鼠脊髓背根神经节(DRG)神经元Nav1.8通道电流(INav1.8)的作用。在急性分离的大鼠DRG神经元上,用全细胞膜片钳技术,观察Que干预INav1.8的剂量-反应关系以及Que影响的Nav1.8通道电压依赖的激活和失活特性。结果显示Que(10,30,100μmol/L)可浓度依赖地抑制DRG神经元INav1.8峰值,峰值抑制率分别为(15.32±3.43)%,(22.92±8.24)%和(47.29±11.42)%,半数抑制浓度(IC50)为121.38μmol/L,Hill系数为0.76;100μmol/L Que可使DRG神经元的Nav1.8通道激活曲线向去极化方向偏移了0.83 m V,失活曲线向超极化方向偏移了1.86 m V;且与干预前比,半数失活电压(V1/2)为-(40.23±0.25)m V,有显著性差异(P<0.01)。说明Que可浓度依赖和电压依赖地抑制DRG神经元Nav1.8通道活性,进而降低痛觉信息的传递,改善慢性内脏痛。
Kv1.5 potassium channel is reported as a potent and safe target for atrial fibrillation.CPUY11018 was proved it had moderate inhibition of Kv1.5.In order to improve the stability of CPUY11018,and investigate the structure-activity relationship,4 series of benzamide derivatives were synthesized and evaluated.Among them,8c is a most potent inhibitor of Kv1.5.
