期刊
EUROPEAN JOURNAL OF IMMUNOLOGY
卷 51, 期 6, 页码 1473-1481出版社
WILEY
DOI: 10.1002/eji.202048960
关键词
α PD‐ 1; Immune checkpoint blockade; Immunotherapy; ADCC; T cell
类别
资金
- OHSU Foundation
- NIH-NIAID [AI047206-13]
Therapeutic antibodies blocking PD-1/PD-L1 interaction have shown success in cancer treatment, but different antibody isotypes and species can impact the outcome. This study demonstrates that anti-PD-1 therapy in mice may lead to unintended target cell depletion and emphasizes the importance of considering antibody clones in experimental design and interpretation. Competing anti-PD-1 clones can be used to detect PD-1-expressing cells despite the presence of blocking antibodies, providing valuable insights for future studies.
Therapeutic antibodies blocking PD-1-/PD-L1 interaction have achieved remarkable clinical success in cancer. In addition to blocking a target molecule, some isotypes of antibodies can activate complement, NK cells or phagocytes, resulting in death of the cell expressing the antibody's target. Human anti-PD-1 therapeutics use antibody isotypes designed to minimize such antibody-dependent lysis. In contrast, anti-PD-1 reagents used in mice are derived from multiple species, with different isotypes, and are not engineered to reduce target cell death: few studies analyze or discuss how antibody species and isotype may impact data interpretation. We demonstrate here that anti-PD-1 therapy to promote activation and proliferation of murine PD-1-expressing CD8 T cells sometimes led instead to a loss of antigen specific cells. This phenomenon was seen in two tumor models and a model of virus infection, and varied with the clone of anti-PD-1 antibody. Additionally, we compared competition among anti-PD-1 clones to find a combination that allows detection of PD-1-expressing cells despite the presence of blocking anti-PD1 antibodies in vivo. These data bring attention to the possibility of unintended target cell depletion with some commonly used anti-mouse PD-1 clones, and should provide a valuable resource for the design and interpretation of anti-PD-1 studies in mice.
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