4-1BB costimulation promotes bystander activation of human CD8 T cells.

ABSTRACT: Costimulatory signals potently promote T-cell proliferation and effector function. Agonistic antibodies targeting costimulatory receptors of the TNFR family, such as 4-1BB and CD27, have entered clinical trials in cancer patients. Currently there is limited information how costimulatory signals regulate antigen-specific but also bystander activation of human CD8 T cells. Engineered antigen presenting cells (eAPC) efficiently presenting several common viral epitopes on HLA-A2 in combination with MHC class I tetramer staining were used to investigate the impact of costimulatory signals on human CD8 T-cell responses. CD28 costimulation potently augmented the percentage and number of antigen-reactive CD8 T cells, whereas eAPC expressing 4-1BB-ligand induced bystander proliferation of CD8 T cel

SUBMITTER: Reithofer M 

PROVIDER: S-EPMC7986150 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature