Journal
MOLECULES
Volume 20, Issue 10, Pages 19252-19262Publisher
MDPI AG
DOI: 10.3390/molecules201019252
Keywords
Juglans mandshurica Maxim; green walnut husks; triterpenoid aglycones; cytotoxic activity; structure-activity relationships
Funding
- National Science Foundation [81202890]
- China Postdoctoral Science Foundation [2013M530164/2014T70374]
- Heilongjiang Postdoctoral Fund [LBH-Z13195]
- Harbin City Youth Science and Technology Innovation Talents [2013RFQXJ052]
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Among the classes of identified natural products, triterpenoids, one of the largest families, have been studied extensively for their diverse structures and variety of biological activities, including antitumor effects. In the present study, a phytochemical study of the green walnut husks of Juglans mandshurica Maxim led to the isolation of a new dammarane triterpene, 12, 20(R), 24(R)-trihydroxydammar-25-en-3-one (6), together with sixteen known compounds, chiefly from chloroform and ethyl acetate extracts. According to their structural characteristics, these compounds were divided into dammarane-type, oleanane- and ursane-type. Dammarane-type triterpenoids were isolated for the first time from the Juglans genus. As part of our continuing search for biologically active compounds from this plant, all of these compounds were also evaluated for their cytotoxic activities against the growth of human cancer cells lines HepG-2 by the MTT assay. The results were shown that 20(S)-protopanaxadiol, 2,3,23-trihydroxyolean-12-en-28-oic acid and 2,3,23-trihydroxyurs-12-en-28-oic acid exhibited better cytotoxicity in vitro with IC50 values of 10.32 +/- 1.13, 16.13 +/- 3.83, 15.97 +/- 2.47 M, respectively. Preliminary structure-activity relationships for these compounds were discussed.
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