21-BD induces apoptosis in HeLa and CHO-K1 cells.
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(A) Score value obtained from the comet assay of CHO-K1 cells incubated 24 h with 21-BD at different concentrations (red circles). (B) Micronucleated cells percentage of CHO-K1 cultures incubated with 21-BD at different concentrations for 24 h. A 24 h incubation with 0.4 mM Methyl methanesulfonate (MMS) was used as a control (A, B, blue circles). (C) Apoptotic and necrotic HeLa cells after 24 h of incubation in control media (white bars), media with 50 µM 21-BD (red bars) or 2 µM digoxin (green bars) for 24 h. Apoptosis and necrosis were detected by flow cytometry ussing an annexin-V translocation assay and the incorporation of propidium iodide in to the nucleus, respectively. P<0.01.