Growth factors and coculture with BMSCs do not protect against tunicamycin-induced BCWM.1 cell cytotoxicity. (A) BCWM.1 cells were cultured with control media, and with tunicamycin (0.5 μg/mL to 1 μg/mL) for 48 hours, in the presence or absence of BMSCs. Cell proliferation was assessed using the [3H]-thymidine uptake assay. (B) BCWM.1 cells were cultured with control media in the presence or absence of IL-6 (25 ng/mL), CD40L (3 ng/mL), or BLyS (100 ng/mL), and treated with tunicamycin (0.1 μg/mL and 1 μg/mL) for 48 hours. Cytotoxicity was assessed by the MTT assay. All data represent mean plus or minus SD of triplicate experiments (A,B).