Cell apoptosis was analyzed as previously described [33 (link)]. Briefly, NB4, MV4-11, Kasumi, and THP-1 cells were treated with dBET1 at indicated concentrations. After 24 h incubation, cells were harvested and washed with cold 1 × PBS buffer. Cells were then suspended in the 1× binding buffer and stained with FITC-Annexin V antibody and PI solution according to the manual of the FITC-Annexin V apoptosis kit (cat. 556420; BD Biosciences, Franklin Lakes, NJ, United States). Cell apoptosis was analyzed by Beckman Gallios™ Flow Cytometer (Beckman, Krefeld, Germany).
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