Talatisamine 是一种乌头生物碱，是一种特异性 K+ 通道阻滞剂。Talatisamine 能减弱 beta- 淀粉样低聚物对培养的皮层神经元的神经毒性。 Information Talatisamine, a delphinine type alkaloid extracted from Aconitum talassicum, is a newly identified K+ channel blocker with hypotensive and antiarrhythmic activities. Targets IK channel 146 μM In vitro Talatisamine is a specific blocker for I K channel. External application of talatisamine reversibly inhibited the delayed rectifier K+ current (IK) with an IC50 value of 146.0±5.8 μM in a voltage-dependent manner, but exhibited very slight blocking effect on the voltage-gated Na+ and Ca2+ currents even at the high concentration of 1-3 mM in rat hippocampal neurons. Talatisamine had no allosteric action on IK channel and was a pure blocker binding to the external pore entry of the channel.