Abstract
CD47 is a widely expressed cell-surface protein that regulates phagocytosis mediated by cells of the innate immune system, such as macrophages and dendritic cells. CD47 serves as the ligand for a receptor on these innate immune cells, signal regulatory protein (SIRP)-α, which in turn inhibits phagocytosis. Several targeted CD47 therapeutic antibodies have been investigated clinically; however, how to improve its therapeutic efficacy remains unclear. Herein, we developed a CD47 blocking antibody, named IBI188, that could specifically block the CD47-SIRP-α axis, which transduces the "don’t eat me" signal to macrophages. In vitro phagocytosis assays demonstrated the pro-phagocytosis ability of IBI188. Furthermore, several in vivo models were chosen to evaluate the anti-tumor efficacy of IBI188. IBI188 treatment upregulated cell movement- and inflammation-related genes in macrophages. Synergism was observed when combined with an anti-CD20 therapeutic antibody, whose function depends on antibody-dependent cellular cytotoxicity/phagocytosis (ADCC/ADCP). CD47 expression was evaluated following azacytidine (AZA) treatment, a standard-of-care for patients with multiple myeloma; enhanced anti-tumor efficacy was observed in the combination group in AML xenograft models. Notably, IBI188 treatment increased vascular endothelial growth factor-A (VEGF-A) levels in a solid tumor model, and combined treatment with an anti-VEGF-A antibody and IBI188 resulted in an enhanced anti-tumor effect. These data indicate that IBI188 is a therapeutic anti-CD47 antibody with anti-tumor potency, which can be enhanced when used in combination with standard-of-care drugs for cancer treatment.
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Abbreviations
- ADCC:
-
Antibody-dependent cellular cytotoxicity
- ADCP:
-
Antibody-dependent cellular phagocytosis
- AZA:
-
Azacytidine
- IBI188:
-
A fully human anti-CD47 therapeutic antibody
- VEGF-A:
-
Vascular endothelial growth factor A
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BP, HB and JG provided the yeast platform; ZW performed the affinity measurement experiments; SZ and LW designed and prepared all the needed protein; HN, XG, YG and HJ designed and performed the in vitro assays; LC, MW, YL, JD, PZ, YZ, WW and BC designed and performed all the in vivo mouse experiment; YX and JS performed the bioinformatics analysis, MY, WW and JL designed the study. All authors read and approved the final manuscript.
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Bianka Prinz, Hemanta Baruah and James Geoghegan have no potential conflicts of interest to disclose. All other authors are employees of Innovent Biologics (Suzhou).
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All mice were maintained under pathogen-free conditions in the Experimental Animal Center of Innovent Biologics Co., Ltd. (Suzhou, China). All mice-related experiments were approved by the Animal Use and Care Committee of Innovent Biologics.
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Ni, H., Cao, L., Wu, Z. et al. Combined strategies for effective cancer immunotherapy with a novel anti-CD47 monoclonal antibody. Cancer Immunol Immunother 71, 353–363 (2022). https://doi.org/10.1007/s00262-021-02989-2
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DOI: https://doi.org/10.1007/s00262-021-02989-2