title: M2-polarized and tumor-associated macrophages alter NK cell phenotype and function in a contact-dependent manner.
abstract: The crosstalk between NK cells and M1 macrophages has a vital role in the protection against infections and tumor development. However, macrophages in the tumor resemble an M2 phenotype, and, at present, their effect on NK cells is less clear. This study investigated whether tumor-associated macrophages (TAMs) have a role in altering NK cell function and phenotype using in vitro cocultures of murine NK cells with peritoneal or bone marrow-derived, M2-polarized macrophages or TAMs isolated from spontaneous mouse breast tumors. We report here that both peritoneal and bone marrow-derived M2 macrophages, as well as TAMs, substantially inhibit NK cell activation and concordant cytotoxicity against tumor cells. The mechanism for this inhibition was found to require contact between the respective cell types. Both M2 macrophages and TAMs are producers of the immunosuppressive cytokine TGF-β. The inhibition of TGF-β restored the cytotoxicity of NK cells in contact with M2 macrophages, implicating TGF-β in the mechanism for NK cell inhibition. In addition to affecting NK cell function, TAMs also induced a CD27lowCD11bhigh-exhausted NK cell phenotype, which corresponds with the reduced activation and cytotoxicity observed. This study reveals a novel implication of TAMs in the tumor-associated inhibition of NK cell function by demonstrating their capacity to directly alter NK cell cytotoxicity and phenotype in a contact-dependent mechanism involving TGF-β. These findings identify the interaction between NK cells and TAMs as a prospective therapeutic target to enhance NK cell effector function for effective NK cell cancer therapies.
authors: Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, McMaster University, Hamilton, Ontario, Canada; and.
authors: Tamara
authors: T
authors: Krneta
authors: Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, McMaster University, Hamilton, Ontario, Canada; and.
authors: Amy
authors: A
authors: Gillgrass
authors: Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, McMaster University, Hamilton, Ontario, Canada; and.
authors: Sophie
authors: S
authors: Poznanski
authors: Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, McMaster University, Hamilton, Ontario, Canada; and.
authors: Marianne
authors: M
authors: Chew
authors: Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, McMaster University, Hamilton, Ontario, Canada; and.
authors: Amanda J
authors: AJ
authors: Lee
authors: Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
authors: Martin
authors: M
authors: Kolb
authors: Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, McMaster University, Hamilton, Ontario, Canada; and ashkara@mcmaster.ca.
authors: Ali A
authors: AA
authors: Ashkar
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000378:metabolism; D002450:Cell Communication; D045744:Cell Line, Tumor; D016764:Cell Polarity; D002470:Cell Survival; D018920:Coculture Techniques; D003602:Cytotoxicity, Immunologic; D007694:Killer Cells, Natural / Q000378:metabolism / Q000473:pathology*; D052118:Lysosomal-Associated Membrane Protein 1 / Q000378:metabolism; D017737:Macrophages, Peritoneal / Q000378:metabolism / Q000473:pathology*; D008810:Mice, Inbred C57BL; D009369:Neoplasms / Q000378:metabolism / Q000473:pathology*; D010641:Phenotype; D016212:Transforming Growth Factor beta / Q000378:metabolism; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000378:metabolism
chemical_list: D052118:Lysosomal-Associated Membrane Protein 1; D016212:Transforming Growth Factor beta; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7
keywords: cancer immunotherapy; innate immunity; tumor immunology