Abstract
Series of novel alizarin and phosphoryl amino acid scaffold (4a–4d, 8a–8d) were synthesized and evaluated for the suppression of cancer cell proliferation in vitro against MGC-803, HepG2, T24, NCI-H460, and SK-OV-3 cell lines by standard 3-(4, 5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay compared with commercial anticancer drug doxorubicin. Interestingly, all newly synthesized compounds exhibited relatively high cytotoxicity compared with alizarin and low cytotoxicity against human normal liver cell line HL-7702 cells. Especially, compound 8d showed the best cytotoxicity against SK-OV-3 cells with IC50 7.09 µM, which was slightly worse than that of drug doxorubicin. The cell apoptosis-inducing activity of representative compound 8d in SK-OV-3 cells revealed that the anticancer activity of this compound depended on apoptosis of cancer cells via regulation of Bcl-2 family members, activation of caspase-9 and caspase-3. Cell cycle analysis confirmed that compound 8d mainly arrested SK-OV-3 cells in G2 stage. In addition, molecular docking studies were performed to position compound 8d into the telomerase (5CQG) active site to determine the probable binding model.
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