FIGURE 2. Tumor cell-selective growth arrest by p53-MDM2 interaction inhibition.
A, Effects on cellular proliferation following treatment of the indicated cells with Nutlin-3 (5 μmol/L, 60 h). B, Microphotographs showing SA-β-Gal staining of normal melanocytes and SK-Mel-103 melanoma cells treated as indicated. C, Vacuolization and positive blue staining for SA-β-Gal of cells in B. Data correspond to the mean percentage ± SEM of cells from three separate visual fields. D, Protein immunoblots comparing effects of Nutlin-3 (5 μmol/L) and doxorubicin (DOX, 0.5 μg/mL) on the p53-MDM2 pathway in normal melanocytes and the indicated melanoma lines.