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Albanesi, Marcello; Mancardi, David A.; Jönsson, Friederike; Iannascoli, Bruno; Fiette, Laurence; Di Santo, James P.; Lowell, Clifford A.; Bruhns, Pierre
Blood, 10/2013, Letnik: 122, Številka: 18Journal Article
Tumor engraftment followed by monoclonal antibody (mAb) therapy targeting tumor antigens represents a gold standard for assessing the efficiency of mAbs to eliminate tumor cells. Mouse models have demonstrated that receptors for the Fc portion of immunoglobulin G (FcγRs) are critical determinants of mAb therapeutic efficacy, but the FcγR-expressing cell populations responsible remain elusive. We show that neutrophils are responsible for mAb-induced therapy of both subcutaneous syngeneic melanoma and human breast cancer xenografts. mAb-induced tumor reduction, abolished in neutropenic mice, could be restored in FcγR-deficient hosts upon transfer of FcγR+ neutrophils or upon human FcγRIIA/CD32A transgenic expression. Finally, conditional knockout mice unable to perform FcγR-mediated activation and phagocytosis specifically in neutrophils were resistant to mAb-induced therapy. Our work suggests that neutrophils are necessary and sufficient for mAb-induced therapy of subcutaneous tumors, and represent a new and critical focal point for optimizing mAb-induced immunotherapies that will impact on human cancer treatment. •Neutrophils are necessary and sufficient for mAb-induced therapy of subcutaneous syngeneic or xenograft tumors in mice.•Antitumor immunoglobulin G mAb therapy requires a Syk-dependent FcγR-induced killing of tumors by neutrophils.
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