Macrophages are abundant in tumor tissues, and they affect the biological properties of tumor cells. The present findings indicated that osteosarcoma (OS) has a high proportion of tumor-promoting M2 macrophages. The CD47 protein can aid tumor cells in their immunological escape. It was identified that CD47 protein is abundant in both clinical OS tissues and OS cell lines. Lipopolysaccharide (LPS) is an activator of Toll-like receptor 4 present on the surface of macrophages, and it induces the polarization towards a pro-inflammatory phenotype; and macrophages of pro-inflammatory phenotype may present antitumor potential. CD47 monoclonal antibody (CD47mAb) can block the CD47-SIRPα signaling pathway, thus enhancing the antitumor ability of macrophages. Immunofluorescence staining confirmed that OS was rich in CD47 protein and M2 macrophages. In the present study, the antitumor potential of macrophages activated using LPS combined with the CD47mAb was assessed. LPS combined with CD47mAb greatly improved macrophages' capacity to phagocytize OS cells, according to the laser confocal experiments and flow cytometry. Furthermore, cell proliferation analysis, cell migration assay and apoptosis determination confirmed LPS-polarized macrophages might efficiently suppress OS cells growth and migration while promoting apoptosis. Taken together, the results of present study demonstrated that LPS combined with CD47mAb enhanced the anti-osteosarcoma ability of macrophages.Keywords: CD47; immunotherapy; lipopolysaccharides; macrophages; osteosarcoma.

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乐备实（上海优宁维生物科技股份有限公司旗下全资子公司），是国内专注于提供高质量蛋白检测以及组学分析服务的实验服务专家，自2018年成立以来，乐备实不断寻求突破，公司的服务技术平台已扩展到单细胞测序、空间多组学、流式检测、超敏电化学发光、Luminex多因子检测、抗体芯片、PCR Array、ELISA、Elispot、PLA蛋白互作、多色免疫组化、DSP空间多组学等30多个，建立起了一套涵盖基因、蛋白、细胞以及组织水平实验的完整检测体系。

 
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