Four new steroidal glycosides from Lilium lancifolium Thunb. and their antitumor activity.

Four new steroidal glycosides (1-4), including two steroidal saponins named lililancifoloside B and C (1-2), one pregnane glycoside named lililancifoloside D (3), and one C22-steroidal lactone glycoside named lililancifoloside E (4), together with five known ones (5-9), were isolated from the bulbs of Lilium lancifolium Thunb. By using spectroscopic analysis, including 1D, 2D NMR, and HR-ESI-MS, the structures of 1-4 were elucidated. All isolates were tested for their cytotoxic potential against the MCF-7, MDA-MB-231, HepG2, and A549 cell lines. Compound 6 distinguished out among them, IC50 values of 3.31, 5.23, 1.78, and 1.49 µM against the four cell lines, respectively. Other compounds such as compound 3, 5, and 9 have also shown specific cytotoxic activity. Next, studies showed that compound 6 might cause HepG2 cells to undergo a cell cycle arrest during the G2/M phase and apoptosis.

Triterpenoid saponins and phenylpropanoid glycoside from the roots of Ardisia crenata and their cytotoxic activities.

Two new triterpenoid saponins, ardisicrenoside R and S (1 and 2), and one new phenylpropanoid glycoside, ardicrephenin (3), along with five known compounds (4-8), were isolated from roots of Ardisia crenata. Their structures were elucidated on the basis of NMR spectroscopic data and chemical methods. Compounds 2-7 were evaluated for their cytotoxic activities against A549, MCF-7, HepG2 and MDA-MB-231 cell lines by MTT assay. Ardicrenin (6) showed significant cytotoxicity, with IC50 values of 1.17 ± 0.01, 1.19 ± 0.06, 3.52 ± 0.23, and 16.61 ± 1.02 µmol·L-1, respectively.