(A) Colony formation assays using the indicated cell lines that were exposed to DMSO, YX968, or YX968-NC at the indicated concentrations. Colonies were fixed and stained after treatment. Representative results of four replicates.
(B) Colony formation assays using the indicated cell lines that were exposed to DMSO, RGFP-966, PCI 34051, or a combination (combo) of RGFP-966 + PCI 34051. Representative results of four replicates.
(C) YX968 promotes CASP3 activation. MDA-MB-231 cells were treated with YX968 at the indicated concentrations for 16 h. The cells were also treated with the IAP inhibitor birinapant as a control. The lysates of the treated cells were analyzed by Western blot with antibodies against the indicated proteins. See also Figure S6.