SOX11i (Cpd R) treatment reduced the PAX5 and CD19 protein expression and attenuated downstream BCR signaling in MCL. (A) JeKo-1, JeKo-1_IBN-R, and Z-138 cells were incubated with Cpd R for 12 and 24 hours and IBN at indicated concentrations, after which PAX5 and CD19 were monitored by immunoblotting analysis. (B) JeKo-1, JeKo-1_IBN-R, and Z138 cells were treated for 12 hours and then stimulated with 5 μg/mL of IgM for 10 minutes. Whole-cell lysates were analyzed using immunoblotting. (C) JeKo-1 cells were treated for 6 hours with Cpd R (20 μM) and IBN (0.25 μM), followed by washing, transfer to fresh medium, and collection at the indicated time points. Immunoblotting analysis was then performed. β-Actin was assayed to ensure equivalent loading and transfer. Ctrl, DMSO Control.