The binding of an anti-PD-1 antibody to FcγRI has a profound impact on its biological functions

Antibodies targeting PD-1 have been demonstrated durable anti-cancer activity in certain cancer types. However, the anti-PD-1 antibodies are less or not efficacious in many situations, which might be attributed to co-expression of multiple inhibitory receptors or presence of immunosuppressive cells in the tumor microenvironment. Most of the anti-PD-1 antibodies used in clinical studies are of IgG4 isotype with the S228P mutation (IgG4(S228P)). The functional impact by the interaction of anti-PD-1 IgG4(S228P) antibody with Fc gamma receptors (Fc gamma Rs) is poorly understood. To assess the effects, we generated a pair of anti-PD-1 antibodies: BGB-A317/IgG4(S228P) and BGB-A317/IgG4-variant (abbreviated as BGB-A317), with the same variable regions but two different IgG4 Fc-hinge sequences. There was no significant difference between these two antibodies in binding to PD-1. However, BGB-A317/IgG4(S228P) binds to human Fc gamma RI with high affinity and mediates crosslinking between PD-1 and Fc gamma RI. In contrast, BGB-A317 does neither. Further cell-based assays showed that such crosslinking could reverse the function of an anti-PD-1 antibody from blocking to activating. More importantly, the crosslinking induces Fc gamma RI+ macrophages to phagocytose PD-1(+) T cells. In a mouse model transplanted with allogeneic human cancer cells and PBMCs, BGB-A317 showed significant tumor growth inhibition, whereas BGB-A317/IgG4(S228P) had no such inhibition. Immunohistochemistry study revealed an inverse correlation between Fc gamma RI+ murine macrophage infiltration and the density of CD8(+)PD-1(+) human T cells within tumors in the BGB-A317/IgG4(S228P)-treated group. These evidences suggested that Fc gamma RI+ binding and crosslinking had negative impact on the anti-PD-1 antibody-mediated anti-cancer activity.