B7-H4 expression identifies a novel suppressive macrophage population in human ovarian carcinoma.

B7-H4 expression identifies a novel suppressive macrophage population in human ovarian carcinoma.
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DOI:
10.1084/jem.20050930
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发表时间:
2006-04-17
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Zou W
Zou W
中科院分区:
其他
文献类型:
--
作者:
Kryczek I;Zou L;Rodriguez P;Zhu G;Wei S;Mottram P;Brumlik M;Cheng P;Curiel T;Myers L;Lackner A;Alvarez X;Ochoa A;Chen L;Zou W

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肿瘤相关巨噬细胞是卵巢癌基质的重要组成部分,有助于肿瘤进展。 B7-H4 是最近鉴定的 B7 家族分子。我们发现原发性卵巢肿瘤细胞表达细胞内 B7-H4,而一小部分肿瘤巨噬细胞表达表面 B7-H4。 B7-H4+ 肿瘤巨噬细胞(而非原发性卵巢肿瘤细胞)抑制肿瘤相关抗原特异性 T 细胞免疫。阻断 B7-H4 而非精氨酸酶、诱导型一氧化氮合酶或 B7-H1 可恢复巨噬细胞的 T 细胞刺激能力,并有助于体内肿瘤消退。白细胞介素 (IL)-6 和 IL-10 在肿瘤微环境中浓度很高。这些细胞因子刺激巨噬细胞 B7-H4 表达。相反,限制在肿瘤微环境中的粒细胞/巨噬细胞集落刺激因子和IL-4抑制B7-H4表达。 B7-H4 的异位表达使正常巨噬细胞受到抑制。因此,B7-H4+肿瘤巨噬细胞构成了卵巢癌中的新型抑制细胞群。 B7-H4 表达是确定宿主对卵巢癌功能失调细胞因子反应的关键检查点。阻断 B7-H4 或消耗 B7-H4+ 肿瘤巨噬细胞可能代表增强癌症中 T 细胞肿瘤免疫的新策略。
Tumor-associated macrophages are a prominent component of ovarian cancer stroma and contribute to tumor progression. B7-H4 is a recently identified B7 family molecule. We show that primary ovarian tumor cells express intracellular B7-H4, whereas a fraction of tumor macrophages expresses surface B7-H4. B7-H4+ tumor macrophages, but not primary ovarian tumor cells, suppress tumor-associated antigen-specific T cell immunity. Blocking B7-H4-, but not arginase-, inducible nitric oxide synthase or B7-H1 restored the T cell stimulating capacity of the macrophages and contributes to tumor regression in vivo. Interleukin (IL)-6 and IL-10 are found in high concentrations in the tumor microenvironment. These cytokines stimulate macrophage B7-H4 expression. In contrast, granulocyte/macrophage colony-stimulating factor and IL-4, which are limited in the tumor microenvironment, inhibit B7-H4 expression. Ectopic expression of B7-H4 makes normal macrophages suppressive. Thus, B7-H4+ tumor macrophages constitute a novel suppressor cell population in ovarian cancer. B7-H4 expression represents a critical checkpoint in determining host responses to dysfunctional cytokines in ovarian cancer. Blocking B7-H4 or depleting B7-H4+ tumor macrophages may represent novel strategies to enhance T cell tumor immunity in cancer.
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