Abstract
Betulinic acid (1) significantly caused cytotoxicity to endothelial cell line ECV304 (IC50 1.26±0.44μg/mL) in a 5-day MTT assay. Novel and more potent derivatives of betulinic acid (2, 4, 6–8) have been synthesized with IC50 less than 0.4μg/mL. The endothelial cell specificity against human tumor cell lines DU145, L132, A549, and PA-1 were determined. Further betulinic acid (1) inhibited TLS formation of ECV304 cells on MatrigelTM by 5.5% while its derivatives caused an inhibition of 13.1–49.2%.
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