Fig. 6. Up-regulation of the endogenous expression of VDR by c-MYB. WEHI-3B D+ (A), U-937 (B), and HL-60 (C) cells were transiently transfected with 4 µg of control vector (CTRL) or with 4 µg of c-MYB expression vector (MYB). Cells were harvested at 48 h, and Western blot analyses were performed as described in "Materials and Methods." The transfections were repeated twice with duplicate samples; representative Western blots are shown.