Journal
MOLECULES
Volume 24, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/molecules24020306
Keywords
Litsea cubeba; cytotoxicity; isolation and elucidation; lignans
Funding
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University [20171040]
- National Natural Science Foundation of China (NNSFC) [81522050, 81773589]
- Key projects of the Beijing Natural Sciences Foundation
- Beijing Municipal Education Committee [KZ201811417049]
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Litsea cubeba, an important medicinal plant, is widely used as a traditional Chinese medicine and spice. Using cytotoxicity-guided fractionation, nine new lignans 1-9 and ten known analogues 10-19 were obtained from the EtOH extract of the twigs of L. cubeba. Their structures were assigned by extensive 1D- and 2D-NMR experiments, and the absolute configurations were resolved by specific rotation and a combination of experimental and theoretically calculated electronic circular dichroism (ECD) spectra. In the cytotoxicity assay, 7,9-epoxylignans with feruloyl or cinnamoyl groups (compounds 7-9, 13 and 14) were selectively cytotoxic against NCI-H1650 cell line, while the dibenzylbutyrolactone lignans 17-19 exerted cytotoxicities against HCT-116 and A2780 cell lines. The results highlighted the structure-activity relationship importance of a feruloyl or a cinnamoyl moiety at C-9 or/and C-7 ketone in 7,9-epoxylignans. Furthermore, compound 11 was moderate active toward protein tyrosine phosphatase 1B (PTP1B) with an IC50 value of 13.5 M, and compounds 4-6, 11 and 12 displayed inhibitory activity against LPS-induced NO production in RAW264.7 macrophages, with IC50 values of 46.8, 50.1, 58.6, 47.5, and 66.5 M, respectively.
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