BA inhibits growth and induces apoptosis in colon cancer cells. (A) Inhibition of cell proliferation. Cells were treated with BA for 48 or 96 h and then counted as described in the Materials and Methods. Cell cycle progression in RKO (B) and SW480 (C) cells. Cells were treated with DMSO (0), 10 or 15 μM BA for 24 h and analyzed by FACS analysis as described in the Materials and Methods. (D) Induction of PARP cleavage. RKO and SW480 cells were treated with BA for 24 h and whole cell lysates were analyzed for cleaved PARP as described in the Materials and Methods. Results in (A) - (C) are expressed as means ± SE for at least 3 replicate experiments and significant (p < 0.05) differences from controls (0, DMSO) are indicated (*).