生物
髓源性抑制细胞
癌症研究
细胞毒性
白细胞介素12
细胞
淋巴因子激活杀伤细胞
Janus激酶3
肿瘤微环境
细胞生物学
白细胞介素21
巨噬细胞
免疫学
体外
免疫系统
T细胞
细胞毒性T细胞
癌症
抑制器
生物化学
遗传学
作者
Tamara Krneta,Amy Gillgrass,Sophie M. Poznanski,Marianne V. Chew,Amanda J. Lee,Martin Kolb,Ali A. Ashkar
标识
DOI:10.1189/jlb.3a1215-552r
摘要
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.
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