Raji cells and purified mouse splenic B lymphocytes were stimulated with hsBAFF (0–5 μg/ml) for 12 h and 48 h, respectively, or with 2.5 μg/ml hsBAFF for indicated time. (A and B) Total cell lysates were subjected to Western blotting using indicated antibodies. The blots were probed for β-actin as a loading control. Similar results were observed in at least three independent experiments. (C and D) The cell proliferation was evaluated by cell counting. (E and F) The cell viability was determined by the MTS assay. All quantified data were expressed as mean ± SEM (n = 5). Using one-way ANOVA, *P < 0.05, **P < 0.01, difference vs 0 μg/ml hsBAFF group or 0 h group.