Thinking inside the box: intracellular roles for complement system proteins come into focus.

Thinking inside the box: intracellular roles for complement system proteins come into focus.
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DOI:
10.1038/s41416-022-02116-7
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发表时间:
2023-01
影响因子:
8.8
通讯作者:
Olcina, Monica M.
Olcina, Monica M.
中科院分区:
医学1区
文献类型:
--
作者:
O'Brien, Rebecca M.;Lynam-Lennon, Niamh;Olcina, Monica M.

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在过去的十年中,关于癌症背景下补体系统的观点已经发生了变化,补体蛋白现在与许多癌症的特征有关。在系统上,补体过敏毒素C5a的产生是级联反应中最有效的炎症介质,发生在补体成分C5的转化酶介导的裂解之后。Ding等人在最近的一篇论文中提出,在结直肠癌细胞中,C5的切割可以在细胞内以不依赖于转化酶的方式发生,并鉴定了组织蛋白酶D是一种能够将C5切割成C5a的酶。细胞内C5a具有功能性,并通过KCTD5/cullin3/ c-1复合物的组装促进β-连环蛋白的稳定。重要的是,C5aR1的阻断可防止肿瘤发生。这项研究增加了越来越多的证据,表明补体蛋白,以前被认为主要具有细胞外或膜结合功能,也有重要的细胞内作用。
Over the last decade, perspectives on the complement system in the context of cancer have shifted, with complement proteins now implicated in many of the hallmarks of cancer. Systemically, the generation of complement anaphylatoxin C5a, the most potent inflammatory mediator of the cascade, occurs following convertase-mediated cleavage of complement component C5. In a recent manuscript, Ding et al., propose that in colorectal cancer cells, C5 cleavage can occur intracellularly and in a convertase-independent manner, identifying cathepsin D as an enzyme capable of cleaving C5 into C5a. Intracellular C5a is functional and promotes β-catenin stabilisation via the assembly of a KCTD5/cullin3/Roc-1 complex. Importantly, the blockade of C5aR1 prevents tumorigenesis. This study adds to a growing body of evidence indicating that complement proteins, previously thought to primarily have extracellular or membrane-bound functions, also have important intracellular roles.
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