Figure 4. Blockade of PDL1: B7.1 pathway accelerated cardiac allograft rejection in PD1 and B7.2 deficient recipients.

(A) bm12 hearts were transplanted into PD1KO recipients and the recipients were treated with 2H11 anti-PDL1 mAb. The survival time of cardiac allografts was significantly shortened as compared to controls. (B) bm12 hearts were transplanted into B7.2-deficient B6 recipients and the recipients treated with 2H11. Bm12 cardiac grafts transplanted into B6 B7.2-deficient recipients had a median survival time of greater than 56 days, while 2H11 precipitated allograft loss. N= 6 for each group.