CR3 ruffles FcγR's claim over phagocytic cups.

CR3 ruffles FcγR's claim over phagocytic cups.
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DOI:
10.1016/j.jbc.2021.100801
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发表时间:
2021-01
期刊:
The Journal of biological chemistry
影响因子:
--
通讯作者:
Frautschy SA
Frautschy SA
中科院分区:
其他
文献类型:
--
作者:
Frautschy SA

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吞噬作用在生物学中具有多种作用,但我们对与不同吞噬模式相关的目的、相互作用以及细胞信号传导机制的理解有限,因为无法从头到尾捕捉并可视化这一快速过程的每一个步骤。沃尔鲍姆(Walbaum)等人的一项新研究利用令人惊叹的延时3D成像技术,对巨噬细胞通过下沉、褶皱和杯状形成吞噬红细胞的过程进行了观察,明确证实了一项基于静态电子显微镜照片提出的、具有前瞻性的44年之久的理论,即由补体受体CR3介导的吞噬作用通过下沉机制发生,而抗体介导的吞噬作用通过吞噬杯状形成发生。该文章还对传统观点提出了挑战,表明吞噬杯状形成并非抗体受体吞噬作用所特有,相反,CR3在不同的吞噬模式中起着复杂的作用。例如,抑制抗体介导的吞噬作用会导致CR3介导的下沉吞噬作用的代偿性上调。这些发现生动地展现了以前只能以静态形式捕捉到的过程,揭示了不同吞噬机制之间的相互作用,并改变了我们对这一重要过程的基本理解。
Phagocytosis plays diverse roles in biology, but our understanding of the purpose, interplay, and cell signaling mechanisms associated with different modes of phagocytosis is limited, without being able to capture and visualize each step in this rapid process from the beginning to end. A new study by Walbaum et al. uses stunning time-lapse 3D imaging of the engulfment of erythrocytes by macrophages via sinking, ruffling, and cup formation, unequivocally confirming a visionary 44-year-old theory derived from still electron microscopy photos that phagocytosis mediated by complement receptor CR3 occurs via a sinking mechanism and antibody-mediated phagocytosis occurs via phagocytic cup formation. The article also challenges the dogma, showing that phagocytic cup formation is not unique to antibody receptor phagocytosis, rather CR3 plays a complex role in different modes of phagocytosis. For example, inhibition of antibody-mediated phagocytosis leads to a compensatory upregulation of CR3-mediated sinking phagocytosis. These findings animate, in vivid colors, processes previously only captured as stills, exposing interactions between different phagocytic mechanisms and altering our basic understanding of this important process.
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