Nuclear fascin regulates cancer cell survival

Nuclear fascin regulates cancer cell survival
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核肌成束蛋白调节癌细胞存活

DOI:
10.1101/2022.06.17.496538
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发表时间:
2022
期刊:
--
影响因子:
--
通讯作者:
Lawson C
Lawson C
中科院分区:
--
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作者:
Lawson C

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成束蛋白是F-肌动蛋白捆绑的重要调节因子,导致丝状伪足组装增强。Fascin也在大多数实体瘤中过表达,其中它通过控制外周和核膜处的F-肌动蛋白结构来支持侵袭。最近,已经在广泛的细胞类型的细胞核中鉴定了肌成束蛋白,但是核肌成束蛋白对癌细胞行为的贡献仍然未知。在这里,我们证明了肌成束蛋白束细胞核内的F-肌动蛋白,以支持染色质组织和有效的DDR。成束蛋白直接与磷酸化组蛋白H3结合,导致核成束蛋白水平受到调节,以支持这些表型。通过表达核靶向的肌成束蛋白特异性纳米抗体或抑制组蛋白H3激酶来迫使核肌成束蛋白积累,导致增强和持续的核F-肌动蛋白集束,从而降低侵袭、活力和核肌成束蛋白特异性/驱动的细胞凋亡。这些发现代表了另外一种重要途径,通过这种途径,肌成束蛋白可以支持肿瘤发生,并为靶向肌成束蛋白依赖性癌细胞杀伤的潜在途径提供了见解。
Fascin is an important regulator of F-actin bundling leading to enhanced filopodia assembly. Fascin is also overexpressed in most solid tumours where it supports invasion through control of F-actin structures at the periphery and nuclear envelope. Recently, fascin has been identified in the nucleus of a broad range of cell types but the contributions of nuclear fascin to cancer cell behaviour remain unknown. Here, we demonstrate that fascin bundles F-actin within the nucleus to support chromatin organisation and efficient DDR. Fascin associates directly with phosphorylated Histone H3 leading to regulated levels of nuclear fascin to support these phenotypes. Forcing nuclear fascin accumulation through the expression of nuclear-targeted fascin-specific nanobodies or inhibition of Histone H3 kinases results in enhanced and sustained nuclear F-actin bundling leading to reduced invasion, viability, and nuclear fascin-specific/driven apoptosis. These findings represent an additional important route through which fascin can support tumourigenesis and provide insight into potential pathways for targeted fascin-dependent cancer cell killing.
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