Figure 1From: Cell death by the quinoxaline dioxide DCQ in human colon cancer cells is enhanced under hypoxia and is independent of p53 and p21DCQ reduces the viability of HCT116 cells more so under hypoxia than normoxia. (A) The effect of hypoxia on HCT116 (p53+/+, p53-/-, p21-/-) cell viability after 6, 12, or 24 hrs of exposure to 1% O2. Cells were plated in 96 well plates at 1.2 × 105 cells/ml and treated at 50% confluency. Viability was determined using Cell Titer 96 non-radioactive proliferation assay. (B) Dose-dependent decrease in the viability of cells exposed to DCQ for 6 hrs and cultured under normoxia or hypoxia. Values are averages ± SD of two independent experiments each done in triplicates; (*) indicates p < 0.05 (one way ANOVA). ■Normoxia □ Hypoxia. The experiment was repeated three times each in quadruplicates.Back to article page