Synthesis and biological evaluation of conjugates of deoxypodophyllotoxin and 5-FU as inducer of caspase-3 and -7

In order to generate compounds with superior antitumor activity and reduced toxicity, a series of conjugates of deoxypodophyllotoxin and 5-FU were synthesized by coupling 4'-demethyl-4-dexoypodophyllotoxin with N-(5-fluorouracil-N(1)-ly acetic)- Amino acids (or 5-fluorouracil-N(1)-ly acetic acid). The cytotoxic activity of these compounds against four human Cancer cell lines (HL-60, A-549, HeLa and SiHa) were evaluated, and results indicated that these compounds were more potent in terms of cytotoxicity than either parent compound DPT or Anticancer drug VP-16 and 5-FU. In addition, we found that 14d induced cell cycle arrest in the G2/M phase accompanied by Apoptosis in A-549 cells, and 14d activated Caspase-3 and -7. These results suggested that caspase-mediated pathways are involved in 14d induced Apoptosis.