PMID: 16520656Mar 8, 2006Paper

Apoptosis-inducing effects of curcumin derivatives in human bladder cancer cells

Anti-cancer Drugs
Qiangsong TongJihua Dong

Abstract

Our aim was to prepare curcumin derivatives and study their apoptosis-inducing effects on bladder cancer cells in order to establish a basis for targeted chemotherapy of cancer. n-Maleoyl-L-valine-curcumin (NVC) and n-maleoyl-glycine-curcumin (NGC) were chemically synthesized. Intracellular esterase activity of the human bladder cancer EJ cell line and renal tubular epithelial (HKC) cells was examined by 6-carboxyfluorescein diacetate fluorometry. After incubation with NVC or NGC for 6-24 h, cell viability was detected by MTT colorimetry. Cell apoptosis and apoptotic rates were measured by acridine orange/ethidium bromide staining, TUNEL labeling and flow cytometry. Intracellular caspase-3 activities were determined by spectrophotometry. The esterase activity within EJ cells was 10.2-fold higher than that of HKC cells, which was abolished by bis-p-nitrophenylphosphate, an esterase inhibitor, resulting in decreases in NVC- and NGC-mediated cell viability arrest. For EJ cells, the IC50 values of NVC (20.1 micromol/l) and NGC (18.7 micromol/l) were close to curcumin (16.5 micromol/l). Meanwhile, their IC50 values on HKC cells were, respectively, 4.06- and 3.23-fold higher than curcumin. Moreover, NVC and NGC induced apoptosis of E...Continue Reading

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