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Article Abstract
Bone metastases remain incurable and respond poorly to immune checkpoint blockade (ICB) therapy. The impact of neutrophil maturation in cancer, particularly in refractory tumors including bone metastases, is not well understood. Here, we observed the predominance of immature neutrophils in the bone metastasis microenvironment of both mouse models and cancer patients. Dickkopf1 (DKK1) induces an immature-like functional state in neutrophils, which exhibit robust immunosuppressive capabilities to inhibit anti-tumor response of CD8 T cells. Mechanistically, the DKK1-CKAP4-STAT6 signaling pathway drives CHI3L3 expression, which is necessary for the immune suppression mediated by immature neutrophils in bone metastases. Moreover, blocking DKK1 promotes neutrophil maturation to improve the immune microenvironment, induces tumor shrinkage, and enhances ICB therapy response in multiple bone metastasis mouse models. These findings uncover a critical role for immature neutrophils in bone metastases and suggest a potential strategy for modulating neutrophils to improve cancer immunotherapy.
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| http://dx.doi.org/10.1016/j.ccell.2025.07.007 | DOI Listing |
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