CD47 blockade triggers T cell-mediated destruction of immunogenic tumors

Xiaojuan Liu, Yang Pu, Kyle Cron, Liufu Deng, Justin Kline, William A. Frazier, Hairong Xu, Hua Peng, Yang Xin Fu, Meng Michelle Xu

Research output: Contribution to journalArticle

248 Scopus citations

Abstract

Macrophage phagocytosis of tumor cells mediated by CD47-specific blocking antibodies has been proposed to be the major effector mechanism in xenograft models. Here, using syngeneic immunocompetent mouse tumor models, we reveal that the therapeutic effects of CD47 blockade depend on dendritic cell but not macrophage cross-priming of T cell responses. The therapeutic effects of anti-CD47 antibody therapy were abrogated in T cell-deficient mice. In addition, the antitumor effects of CD47 blockade required expression of the cytosolic DNA sensor STING, but neither MyD88 nor TRIF, in CD11c + cells, suggesting that cytosolic sensing of DNA from tumor cells is enhanced by anti-CD47 treatment, further bridging the innate and adaptive responses. Notably, the timing of administration of standard chemotherapy markedly impacted the induction of antitumor T cell responses by CD47 blockade. Together, our findings indicate that CD47 blockade drives T cell-mediated elimination of immunogenic tumors.

Original languageEnglish (US)
Pages (from-to)1209-1215
Number of pages7
JournalNature medicine
Volume21
Issue number10
DOIs
StatePublished - Oct 1 2015

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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    Liu, X., Pu, Y., Cron, K., Deng, L., Kline, J., Frazier, W. A., Xu, H., Peng, H., Fu, Y. X., & Xu, M. M. (2015). CD47 blockade triggers T cell-mediated destruction of immunogenic tumors. Nature medicine, 21(10), 1209-1215. https://doi.org/10.1038/nm.3931