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Six new dammarane-type triterpenes from acidic hydrolysate of the stems-leaves of Panax ginseng and their inhibitory–activities against three human cancer cell lines

Ma, Li-Yuan, Yang, Xiu-Wei
Phytochemistry letters 2015 v.13 pp. 406-412
Panax ginseng, antineoplastic agents, cytotoxicity, humans, hydrolysates, inhibitory concentration 50, neoplasms, spectroscopy, structure-activity relationships, triterpenoids
Six new dammarane-type triterpenes, namely 3β,6α,12β-trihydroxy-20S,24S-epoxydammar-25-ene (1), 3β-acetoxy-6α,12β,25-trihydroxy-24,25-dihydrodammar-(E)-20(22)-ene (2), 3β,6α,12β-trihydroxy-20S,24R-epoxydammar-25-ene (3), 6α-acetoxy-3β,12β,20R-trihydroxydammar-25-ene (4), 6α-acetoxy-3β,12β,20R-trihydroxydammar-24-ene (5), and 12β-acetoxy-3β,6α,25-trihydroxy-24,25-dihydrodammar-(E)-20(22)-ene (6), together with thirteen known compounds (7–19) were isolated from the acidic hydrolysate of the stems-leaves of Panax ginseng. Their chemical structures were elucidated by considerable spectroscopic analyses and comparison with the reported data. All 19 compounds were evaluated for their cytotoxicties against three human cancer cell lines, HL-60, NCI-N87 and Hep-G2. Compound 11 exhibited significant inhibitory activity in a concentration-dependent manner against HL-60 and Hep-G2 with the IC50 values of 4.21 and 6.69μM, respectively. Its activity was stronger than that of the positive control vinorelbine, of which the IC50 values against HL-60 and Hep-G2 were 11.47 and 23.12μM, respectively. Compounds 4, 7, 8, 12–14, and 19 showed moderate cytotoxic activities at the concentrations of 1–200μM against the three human cancer cell lines. The preliminary structure to activity relationship was also discussed based on the experimental data obtained. Complete side chain, the configuration of C-20, the substitution of hydroxyl group of C-25 and C-3 were important factors influencing the cytotoxicities. The results may also provide useful data for researching new anti-tumor agents.