Hirsuteine is an indole alkaloid extracted from Uncaria genus. Hirsuteine non-competitively antagonizes nicotine-mediated dopamine release by blocking ion permeation through nicotinic receptor channel complexes[1].
[1]. Watano T, et al. Non-competitive antagonism by hirsuteine of nicotinic receptor-mediated dopamine release from rat pheochromocytoma cells. Jpn J Pharmacol. 1993 Apr;61(4):351-6.
















