文摘
Three new chalcone derivatives, named parasiticins A-C (1-3), were isolated from the leaves of Cyclosorus parasiticus, together with four known chalcones, 5,7-dihydroxy-4-phenyl-8-(3-phenyl-trans-acryloyl)-3,4-dihydro-1-benzopyran-2-one (4), 2¡ä-hydroxy-4¡ä,6¡ä-dimethoxychalcone (5), 2¡ä,4¡ä-dihydroxy-6¡ä-methoxy-3¡ä,5¡ä-dimethylchalcone (6), 2¡ä,4¡ä-dihydroxy-6¡ä-methoxy-3¡ä-methylchalcone (7). The chemical structures of the new isolated compounds were elucidated unambiguously by spectroscopic data analysis. The cytotoxic activities of compounds 1-7 were evaluated against six human cancer cell lines in vitro. Compounds 3 and 6 exhibited substantial cytotoxicity against all six cell lines, especially toward HepG2 with the IC50 values of 1.60 and 2.82 ¦ÌM, respectively. Furthermore, we demonstrated that compounds 3 and 6 could induce apoptosis in the HepG2 cell line, which may contribute significantly to their cytotoxicity.