Two structurally distinct chalcone dimers from Helichrysum zivojinii and their activities in cancer cell lines
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Dimers tomoroside A (1) and tomoroside B (2) of the co-occuring known chalcone monomer (3), along with the seven known flavonoid glucosides (4-10), were isolated from the aerial parts of Helichrysum zivojinii Cernjavski & Soska. The structures of the isolated compounds were elucidated by spectroscopic techniques. Compound 1 inhibited topo Ha and hif-1 alpha expression and stimulated doxorubicin anticancer effect, while 2 increased the expression of hif-1 alpha a, probably acting as antioxidant and redox status modulator. Notably, 2 synergized with Tipifarnib showing potential to improve the action of this new chemotherapeutic involved in the modulation of mitogene activated protein (MAP) kinase signaling pathway.
Keywords:Helichrysum zivojinii / Asteraceae / Chalcone glucoside dimers / Flavonoid glucoside / Topoisomerase II alpha / HIF-1 alpha / MAP kinase pathway / Drug combination
Source:Phytochemistry, 2014, 98, 190-196
- Pergamon-Elsevier Science Ltd, Oxford