The role of p53 in H2O2-mediated cell death of hOGG1-deficient H1299 lung carcinoma p53 null cells. The role of p53 in H2O2-mediated cell death of hOGG1-deficient.

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The role of p53 in H2O2-mediated cell death of hOGG1-deficient H1299 lung carcinoma p53 null cells. The role of p53 in H2O2-mediated cell death of hOGG1-deficient H1299 lung carcinoma p53 null cells. A. After H1299 cells were transfected with control- and/or hOGG1-siRNA together with pcDNA3.1 or p53-pcDNA3.1 expression vector, whole-cell lysates were prepared, and Western blot analysis was done using anti-hOGG1 polyclonal antibodies and anti-p53 polyclonal antibodies. Data were normalized with β-actin expression. Columns, mean based on the results from Western blot analysis; bars, SD. Statistically significant differences in the expression of hOGG1 and p53 were determined by the ANOVA with P values given for both the overall (P) and the pair-wise comparisons as indicated by asterisks (*, P < 0.05). B. The cells in A were cultured to 70% to 80% confluence and treated with the indicated concentration of H2O2 for 1 h. The medium was then changed to a fresh one, and the extent of cell death was estimated with MTT assay kit as described in Materials and Methods. Cell viability was determined as the percentage of total cell number. Points, mean from three separate experiments; bars, SD. The level of cell viability at 100 μmol/L H2O2 treatment was separately described together with the graphical presentation. Cha-Kyung Youn et al. Mol Cancer Res 2007;5:1083-1098 ©2007 by American Association for Cancer Research