A new norditerpene alkaloid, 10-hydroxy-8- O-methyltalatizamine (1), was isolated from the whole plant of ACONITUM ANTHORA L. besides the known isotalatizidine (2) and hetisinone (3).
METHODS AND RESULTS:
The structures were determined by means of HR-ESI-MS, 1D and 2D NMR spectroscopy, including 1H-1H COSY, NOESY, HSQC and HMBC experiments, resulting in complete 1H and 13C chemical shift assignments for 1- 3, and revision of some earlier 13C-NMR data. The effects of the isolated compounds, together with twenty-one other ACONITUM alkaloids with different skeletal types and substitution patterns, on hERG channels were studied by the whole-cell patch clamp technique, using the QPatch-16 automated patch clamp system.
CONCLUSIONS:
At 10 μM, aconitine, 14-benzoylaconine 8- O-palmitate, Songoramine, gigactonine and neolinine demonstrated significant hERG K+ channel inhibition; all other compounds exerted only low (6-21%) inhibitory activity. |