Abstract
Background
CD47 is a widely expressed cellular receptor well known for its immunoregulatory functions. By interacting with its ligands, including thrombospondin-1 (TSP-1), signal regulatory protein α (SIRPα), integrins, and SH2-domain bearing protein tyrosine phosphatase substrate-1 (SHPS-1), it modulates cellular phagocytosis by macrophages, transmigration of neutrophils and activation of dendritic cells, T cells and B cells. Ample studies have shown that various types of cancer express high levels of CD47 to escape from the immune system. Based on this observation, CD47 is currently considered as a prominent target in cancer therapy.
Conclusions
Here, we review the role of CD47 in the maintenance of immune system homeostasis. We also depict three emerging CD47-targeting strategies for cancer therapy, including the use of mimicry peptides, antibodies, and gene silencing strategies. Among these approaches, the most advanced one is the use of anti-CD47 antibodies, which enhances cancer cell phagocytosis via inhibition of the CD47-SIRPα axis. These antibodies can also achieve higher anti-cancer efficacies when combined with chemotherapy and immunotherapy and hold promise for improving the survival of patients with cancer.
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Acknowledgments
This project was supported by a grant from Cancer Research Center of the Cancer Institute of Iran (Sohrabi Cancer Charity, Grant No: 37652-202-01-97). This project was also financially supported by grant No. 961204 of the Biotechnology Development Council of the Islamic Republic of Iran.
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Hayat, S.M.G., Bianconi, V., Pirro, M. et al. CD47: role in the immune system and application to cancer therapy. Cell Oncol. 43, 19–30 (2020). https://doi.org/10.1007/s13402-019-00469-5
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DOI: https://doi.org/10.1007/s13402-019-00469-5