Overexpression of sCLU overcomes API-2-induced chemosensitivity to docetaxel. A, DU145-DR tumor cells were transfected with either control PCDNA3 or myc-tagged sCLU. These cells were then pretreated with API-2 for 2 h and incubated in docetaxel medium for 48 h. Western blot analysis with anti-myc was done to confirm efficient transfection, and further analysis of sCLU, pAKT, and total AKT was pursued. It is confirmed that API-2 can suppress AKT function in both PCDNA3- and sCLU-expressing tumor cells. B, these same cells were also analyzed for cell growth and survival by methylene blue staining. API-2 effectively induced docetaxel sensitivity and cell death in DU145-DR tumor cells but could not do so in the sCLU-overexpressing DU145-DR tumor cells.