Figure 3.
CD40, BAFF-R, and BCR signaling of isolated splenic B cells. (A–C) CD43− B cells from the spleen of 9–10-wk-old control (Ptpn1f/f) and Ptpn1f/f-mb1cre mice were stimulated with 10 µg/ml anti-CD40 (A), 50 ng/ml recombinant mouse BAFF (B), or 10 µg/ml anti-IgM F(ab′)2 (C) for the given times. The activation of the indicated downstream signaling molecules was studied by Western blot. (Phosphorylated forms of the molecules are marked as “p-“.) The data shown are representative of three experiments with similar results. The molecular masses of the bands (in kilodaltons) are indicated in parentheses.