Cutting Edge: Targeting Thrombocytes to Rewire Anticancer Immunity in the Tumor Microenvironment and Potentiate Efficacy of PD-1 Blockade.

ABSTRACT: Aside from their roles in hemostasis and thrombosis, thrombocytes or platelets also promote tumor growth via immune suppression. However, the extent to which platelet activation shapes the immunosuppressive tumor microenvironment (TME) and whether platelet inhibition can be leveraged to improve checkpoint blockade are unknown. We show in this study that platelet function in mice mediates suppression of CD8⁺ T cell function within the TME but not in the draining lymph nodes. Tempering platelet activation genetically reduced TGF-β signaling in both immune and nonimmune cells in the TME, enhanced T cell frequency and function, and decreased CD11b⁺ myeloid cell infiltration in the tumor. Targeting platelet function pharmacologically in tumor-bearing mice with aspirin and

SUBMITTER: Riesenberg BP 

PROVIDER: S-EPMC7304159 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature