Figure 3. Cytotoxicity of 5-FU, curcumin and the combination treatment on colon cancer cells in high density cultures.

High density cultures of HCT116, HCT116+ch3 (A), or HCT116R and HCT116+ch3R (B) were either left untreated or were treated with 5-FU (5 µM), curcumin (20 µM), or 5-FU/curcumin in combination (0.1/5 µM). Cultures were evaluated after 1, 3, 7, and 10 days, and stained with Hoechst 33258 (DAPI) to reveal apoptotic changes of the cell nuclei. Pictures are representative of three individual experiments.