Converting Lymphoma Cells into Potent Antigen-Presenting Cells for Interferon-Induced Tumor Regression.

ABSTRACT: Anti-hCD20 is a therapeutic mAb that is clinically used to treat B-cell lymphoma. Some lymphomas are resistant to anti-hCD20; others relapse after treatment with anti-hCD20. Using a syngeneic immunocompetent mouse model, we observed that targeting lymphoma with interferon-? (IFN?) abolished resistance of B-cell lymphoma to anti-CD20 while limiting interferon (IFN)-associated systemic toxicity in the host. Control of tumors by a fusion of anti-CD20 and IFN? (anti-CD20-IFN?) depended on existing tumor-infiltrating CD8+ T cells. Although lymphomas were resistant to IFN-directed killing, IFN-exposed tumor cells became the dominant antigen-presenting cells (APC) for the reactivation of tumor-infiltrating CD8+ T cells that then controlled those lymphomas. Anti-CD20-IFN? also abolished checkpoint blockade resistance in advanced B-cell lymphoma. Our findings indicate that anti-CD20-IFN? eradicates B-cell lymphoma by employing tumor cells as APCs to reactivate tumor-infiltrating CD8+ T cells and synergizing with anti-PD-L1 treatment. Cancer Immunol Res; 5(7); 560-70. ©2017 AACR.

SUBMITTER: Liao J 

PROVIDER: S-EPMC5510552 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature