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Tumor cells are capable of limiting antitumor CD8 +  T cell responses through their cell surface expression of PD-L1. In addition to PD-1 expressed by CD8 +  T cells, PD-L1 also binds to CD80 expressed by CD8 +  T cells. The influence of the PD-L1/CD80 interaction on CD8 +  T cell function has not been fully characterized, so we sought to investigate the impact of the PD-L1/CD80 interaction on PD-L1-induced apoptosis of activated CD8 +  T cells. We found that CD8 +  T cells that lacked CD80 expression got activated to the same extent as wild-type CD8 +  T cells, but when cultured with anti-CD3 and PD-L1/Fc protein, activated CD8 +  T cells that lacked CD80 expression survived better than activated wild-type CD8 +  T cells. These findings indicate that PD-L1 induces apoptosis in activated CD8 +  T cells in part by signaling through CD80. Thus, in the design and implementation of checkpoint blockade therapies that target PD-L1, it is essential that both binding partners for PD-L1, PD-1, and CD80 are considered.

CD80 Expressed by CD8+ T Cells Contributes to PD-L1-Induced Apoptosis of Activated CD8+ T Cells

CD80 Expressed by CD8⁺ T Cells Contributes to PD-L1-Induced Apoptosis of Activated CD8⁺ T Cells