Radiation combined with Macrophage Depletion Promotes Immunity and Potentiates Checkpoint Blockade

ABSTRACT: Emerging evidence suggests a role for radiation in eliciting antitumour immunity. We aimed to investigate the role of macrophages in modulating the immune response to radiation. Irradiation to murine tumours generated from colorectal (MC38) and pancreatic (KPC) cell lines induced Colony Stimulating Factor 1 (CSF-1). Coincident with the elevation in CSF-1, macrophages increased in tumours, peaking five days following irradiation. These tumour-associated macrophages (TAMs) were skewed toward an immunosuppressive phenotpye. Macrophage depletion via anti-CSF (aCSF) reduced macrophage numbers, yet only achieved tumour growth delay when combined with radiation. The tumour growth delay from aCSF after radiation was abrogated by depletion of CD8 T cells. There was enhanced recognition of tumour ce

SUBMITTER: Dr. Keaton, Ian Jones 

PROVIDER: S-SCDT-88789_2_1540197428_jats | biostudies-other |

REPOSITORIES: biostudies-other