Figure 7. Specificity of B7-1:PD-L1 interactions.
A. WT, CD28/CTLA-4-/-, or CD28/CTLA-4/PD-L1-/- CD4 T cells were cultured in wells coated with anti-CD3 antibody (10 μg/mL) plus either PD-L1-Ig (10 μg/mL) or control Ig (10 μg/mL). CFSE dilution was examined by flow cytometry at 48 hours.
B. WT, PD-1-/-, or PD-1/B7-1-/- CD4 T cells were cultured in wells coated with anti-CD3 antibody (5 μg/mL) plus either PD-L1-Ig (10 μg/mL) or control Ig (10 μg/mL). CFSE dilution was examined by flow cytometry at 48 hours.