Fig. 5From: MASTL inhibition promotes mitotic catastrophe through PP2A activation to inhibit cancer growth and radioresistance in breast cancer cellsMASTL depletion causes mitotic catastrophe. MCF7 cells were transfected with either control siRNA or MASTL.5 siRNA for 48 h. a MASTL-depleted cells were scored for abnormal mitosis (≥ 200 mitotic cells for each data point, n = 4, error bars show ± SD). b Representative images of MASTL-depleted cells stained with DAPI (blue). c The intensities of γ-H2AX were scanned and determined by IN Cell Analyzer HCA System. The intensities of 50 dots in the control and MASTL-depleted cells were determined by the γ-H2AX intensity from 200 ~ 700 cells. d The time of mitotic entry was determined by observing mitotic cell rounding with signs of DNA condensation (red arrow) and was monitored by time-lapse microscopy. e After control (Ctrl) siRNA or MASTL.5 siRNA transfection for 24 h, the cells were quantified in four statuses (normal, mitotic arrest, mitotic catastrophe, and mitotic slippage). f MCF7 and T47D cells were transfected with either control siRNA or MASTL.5 siRNA for the indicated time periods. The cells were analyzed by immunoblotting with the indicated antibodies. g MCF7 cells were transfected with either 5 nmol/l control siRNA or 5 nmol/l MASTL.5 siRNA and then incubated without or with zVAD for 48 h. The cell viability was determined by WST-8 assay. h PP2A-Aα/β proteins were immunoprecipitated using an anti-PP2A-Aα/β antibody and analyzed for PP2A activity. i MCF7 cells were transfected with the indicated siRNAs targeting MASTL.5 or PP2A-Aα/β for 48 h. The cells were analyzed by immunoblotting with the indicated antibodies. The data represent typical results and are presented as the mean ± standard deviation of three independent experiments; Scale bars = 10 μm. **P < 0.01Back to article page