Arp2/3 Complex Is Required for Macrophage Integrin Functions but Is Dispensable for FcR Phagocytosis and In Vivo Motility.

Arp2/3 Complex Is Required for Macrophage Integrin Functions but Is Dispensable for FcR Phagocytosis and In Vivo Motility.
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DOI:
10.1016/j.devcel.2017.08.003
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发表时间:
2017-09-11
期刊:
影响因子:
11.8
通讯作者:
Bear JE
Bear JE
中科院分区:
生物学1区
文献类型:
--
作者:
Rotty JD;Brighton HE;Craig SL;Asokan SB;Cheng N;Ting JP;Bear JE

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Arp 2/3复合物使分支肌动蛋白成核,形成参与板状伪足突出、吞噬作用和细胞粘附的网络。我们获得了缺乏Arp 2/3复合物(Arpc 2 −/−)的原代骨髓巨噬细胞,并直接测试了其在巨噬细胞功能中的作用。尽管存在突起和肌动蛋白组装缺陷,但Arpc 2 −/−巨噬细胞能够通过FcR和chemotax吞噬CSF和CX 3CL 1。然而,CR 3的吞噬作用和纤连蛋白的趋触性,这两个整合素依赖的过程,被破坏。整合素反应性肌动蛋白组装和αM/β2整合素定位在Arpc 2 −/−细胞中受损。使用体内系统观察内源性单核细胞向全层耳部伤口迁移,我们发现Arpc 2 −/−单核细胞保持与对照组相似的细胞速度和方向性。我们的工作表明,Arp 2/3复合物不是吞噬作用或趋化作用的一般要求,但却是整合素依赖性过程的关键驱动因素。我们进一步证明,缺乏Arp 2/3复杂功能的细胞在体内仍然能够执行重要的生理反应,需要快速定向运动。使用基于细胞培养和体内小鼠实验的组合,Rotty等人证明肌动蛋白成核Arp 2/3复合物不是巨噬细胞FcR吞噬作用、趋化性或体内单核细胞定向运动所绝对需要的。相反,该复合物在调节整合素依赖性巨噬细胞过程中具有关键作用。
The Arp2/3 complex nucleates branched actin, forming networks involved in lamellipodial protrusion, phagocytosis and cell adhesion. We derived primary bone marrow macrophages lacking Arp2/3 complex (Arpc2−/−) and directly tested its role in macrophage functions. Despite protrusion and actin assembly defects, Arpc2−/− macrophages competently phagocytose via FcR and chemotax towards CSF and CX3CL1. However, CR3 phagocytosis and fibronectin haptotaxis, both integrin-dependent processes, are disrupted. Integrin-responsive actin assembly and αM/β2 integrin localization are compromised in Arpc2−/− cells. Using an in vivo system to observe endogenous monocytes migrating toward full-thickness ear wounds we found that Arpc2−/− monocytes maintain cell speeds and directionality similar to control. Our work reveals that the Arp2/3 complex is not a general requirement for phagocytosis or chemotaxis, but is a critical driver of integrin-dependent processes. We demonstrate further that cells lacking Arp2/3 complex function in vivo remain capable of executing important physiological responses that require rapid directional motility. Using a combination of cell culture-based and in vivo mouse experiments, Rotty et al. demonstrate that the actin-nucleating Arp2/3 complex not absolutely required for macrophage FcR phagocytosis, chemotaxis, or in vivo monocyte directional motility. Rather, the complex has a critical role in regulating integrin-dependent macrophage processes.
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