“ Berberine inhibited the release of glutamate evoked by the K+ channel blocker 4-aminopyridine ( 4-AP ), and this phenomenon was prevented by the chelating extracellular Ca2+ ions and the vesicular transporter inhibitor bafilomycin A1, but was insensitive to the glutamate transporter inhibitor DL-threo-beta-benzyl-oxyaspartate.”