After 24 h exposure to bortezomib (10 nM), carfilzomib (5 nM), ixazomib (50 nM), alisertib, volasertib (500 nM) and avapritinib (250 nM) alone or in combination with bortezomib or alisertib, apoptotic cell death was assessed in HMC-1 and ROSAKIT D816V cells by using the Annexin-V-FLUOS Staining Kit by Roche Applied Science, according manufacturer instructions and measuring the uptake of fluorescinated Annexin V and propidium iodide (both from Roche). A FACSCanto II flow cytometer (Beckton Dickinson) set at 488 nm excitation and 530 nm wavelength bandpass filter for fluorescein detection or 580 nm for PI detection and a dedicated software (DIVA, Beckton Dickinson) were used for analysis.
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