Size-Dependent Segregation Controls Macrophage Phagocytosis of Antibody-Opsonized Targets.

Size-Dependent Segregation Controls Macrophage Phagocytosis of Antibody-Opsonized Targets.
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大小依赖性分离控制巨噬细胞对抗体调理靶标的吞噬作用。

DOI:
10.1016/j.cell.2018.05.059
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发表时间:
2018-06-28
期刊:
影响因子:
64.5
通讯作者:
Fletcher DA
Fletcher DA
中科院分区:
生物学1区
文献类型:
--
作者:
Bakalar MH;Joffe AM;Schmid EM;Son S;Podolski M;Fletcher DA

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巨噬细胞通过靶向抗体调理的细胞进行吞噬作用来保护身体免受损伤和疾病。尽管可以针对具有不同结构、形状和大小的抗原产生抗体,但目前还不清楚为什么有些抗体在触发免疫反应方面比其他抗体更有效。在这里,我们定义了一个抗原高度阈值,调节巨噬细胞吞噬工程抗原和癌症特异性抗原。使用抗体调理的靶细胞的重建模型,我们发现对于将抗体定位在距离靶表面>10 nm的抗原,吞噬作用显著受损。降低抗原高度驱动抗体结合的Fc受体以整合素非依赖性方式与抑制性磷酸酶CD45分离,从而触发Fc受体磷酸化并促进吞噬作用。我们的工作表明,巨噬细胞和靶标之间的紧密接触是有效吞噬作用的必要条件,这表明治疗性抗体应靶向短抗原,以便通过大小依赖性物理分离触发Fc受体活化。抗原的大小是巨噬细胞有效吞噬作用的关键决定因素
Macrophages protect the body from damage and disease by targeting antibody-opsonized cells for phagocytosis. Though antibodies can be raised against antigens with diverse structures, shapes, and sizes, it is unclear why some are more effective at triggering immune responses than others. Here we define an antigen height threshold that regulates phagocytosis of both engineered and cancer-specific antigens by macrophages. Using a reconstituted model of antibody-opsonized target cells, we find that phagocytosis is dramatically impaired for antigens that position antibodies >10 nm from the target surface. Decreasing antigen height drives segregation of antibody-bound Fc receptors from the inhibitory phosphatase CD45 in an integrin-independent manner, triggering Fc receptor phosphorylation and promoting phagocytosis. Our work shows that close contact between macrophage and target is a requirement for efficient phagocytosis, suggesting that therapeutic antibodies should target short antigens in order to trigger Fc receptor activation through size-dependent physical segregation. The size of an antigen is a critical determinant of efficient macrophage phagocytosis
Fcgamma受体介导的巨噬细胞中缺乏SRC家族酪氨酸激酶HCK,FGR和Lyn的吞噬作用。
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