PD-1 agonism by anti-CD80 inhibits T cell activation and alleviates autoimmunity.

Targeted blockade of the checkpoint molecule programmed cell death 1 (PD-1) can activate tumor-specific T cells to destroy tumors, whereas targeted potentiation of PD-1 is expected to suppress autoreactive T cells and alleviate autoimmune diseases. However, the development of methods to potentiate PD-1 remains challenging. Here we succeeded in eliciting PD-1 function by targeting the cis-PD-L1-CD80 duplex, formed by binding of CD80 to the PD-1 ligand PD-L1, that attenuates PD-L1-PD-1 binding and abrogates PD-1 function. By generating anti-CD80 antibodies that detach CD80 from the cis-PD-L1-CD80 duplex and enable PD-L1 to engage PD-1 in the presence of CD80, we demonstrate that the targeted dissociation of cis-PD-L1-CD80 duplex elicits PD-1 function in the condition where PD-1 function is otherwise restricted. We demonstrate using murine models that the removal of PD-1 restriction is effective in alleviating autoimmune disease symptoms. Our findings establish a method to potentiate PD-1 function and propose the removal of restraining mechanisms as an efficient strategy to potentiate the function of inhibitory molecules. © 2022. The Author(s), under exclusive licence to Springer Nature America, Inc.

Citation

Daisuke Sugiura, Il-Mi Okazaki, Takeo K Maeda, Takumi Maruhashi, Kenji Shimizu, Rieko Arakaki, Tatsuya Takemoto, Naozumi Ishimaru, Taku Okazaki. PD-1 agonism by anti-CD80 inhibits T cell activation and alleviates autoimmunity. Nature immunology. 2022 Mar;23(3):399-410

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PMID: 35145298

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