Journal
ADVANCED MATERIALS
Volume 32, Issue 47, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004853
Keywords
cancer immunotherapy; CD47-SIRP alpha; cell-membrane coatings; gene engineering; macrophage immune response; tumor-associated macrophages
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Funding
- Intramural Research Program of National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH)
- National Natural Science Foundation of China [81972003]
- Natural Science Foundation of Guangdong [2017A030313668, 2017A030313563]
- Sanming Project of Medicine in Shenzhen [SZSM201612031]
- Shenzhen Municipal Government of China [JCYJ20170817171808368, KQTD20170810160226082]
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Immunomodulation of macrophages against cancer has emerged as an encouraging therapeutic strategy. However, there exist two major challenges in effectively activating macrophages for antitumor immunotherapy. First, ligation of signal regulatory protein alpha (SIRP alpha) on macrophages to CD47, a don't eat me signal on cancer cells, prevents macrophage phagocytosis of cancer cells. Second, colony stimulating factors, secreted by cancer cells, polarize tumor-associated macrophages (TAMs) to a tumorigenic M2 phenotype. Here, it is reported that genetically engineered cell-membrane-coated magnetic nanoparticles (gCM-MNs) can disable both mechanisms. The gCM shell genetically overexpressing SIRP alpha variants with remarkable affinity efficiently blocks the CD47-SIRP alpha pathway while the MN core promotes M2 TAM repolarization, synergistically triggering potent macrophage immune responses. Moreover, the gCM shell protects the MNs from immune clearance; and in turn, the MN core delivers the gCMs into tumor tissues under magnetic navigation, effectively promoting their systemic circulation and tumor accumulation. In melanoma and breast cancer models, it is shown that gCM-MNs significantly prolong overall mouse survival by controlling both local tumor growth and distant tumor metastasis. The combination of cell-membrane-coating nanotechnology and genetic editing technique offers a safe and robust strategy in activating the body's immune responses for cancer immunotherapy.
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