Tabalumab neutralizes soluble or membrane-bound human BAFF co-stimulation of B-cells.
Notes: (A) Primary human CD19+ B-cells were co-stimulated with 25 ng/mL soluble BAFF plus anti-IgM/IL-4 in the presence of a dose response of tabalumab or isotype control. Proliferation was measured using 3H-thymidine incorporation at day 5. (B) Primary human CD19+ B-cells were co-stimulated with 2.3 ng/mL soluble BAFF or 5.5 ng/mL membrane-bound BAFF plus anti-IgM/IL-4. Gray bars represent cells treated with 1 μg/mL tabalumab, black bars represent cells treated with 1 μg/mL isotype control. Stimulation with anti-IgM/IL-4 alone produced a relatively low proliferative signal of 3640 ± 592 CPM. Proliferation was measured using 3H-thymidine incorporation at day 3. Data are presented as mean ± SD.
Abbreviations: BAFF, B-cell activating factor; CPM, counts per minute; Ig, immunoglobulin; IL, interleukin; mem, membrane-bound; SD, standard deviation.