The alternatively-included 11a sequence modifies the effects of Mena on actin cytoskeletal organization and cell behavior.

The alternatively-included 11a sequence modifies the effects of Mena on actin cytoskeletal organization and cell behavior.
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替代性的11A序列改变了MENA对肌动蛋白细胞骨架组织和细胞行为的影响。

DOI:
10.1038/srep35298
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发表时间:
2016-10-17
期刊:
影响因子:
4.6
通讯作者:
Gertler FB
Gertler FB
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Balsamo M;Mondal C;Carmona G;McClain LM;Riquelme DN;Tadros J;Ma D;Vasile E;Condeelis JS;Lauffenburger DA;Gertler FB

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在肿瘤进展过程中,选择性剪接产生不同的 Mena 蛋白亚型。我们分析了 Mena11a(一种富含上皮和上皮样细胞的异构体)如何影响肌动蛋白动力学和细胞行为的 Mena 依赖性调节。虽然其他 Mena 异构体促进肌动蛋白聚合并驱动膜突出,但我们发现 Mena11a 减少肌动蛋白聚合和生长因子刺激的片状伪足膜突出。异位 Mena11a 表达会减慢间充质样细胞的运动性,而上皮样肿瘤细胞中内源性 Mena11a 的异构体特异性缺失会扰乱细胞:细胞连接并增加膜突出和整体细胞运动性。在没有其他 Mena 亚型的情况下,Mena11a 可以抑制膜突出并减少肌动蛋白聚合,这表明它不仅仅是一种无活性的 Mena 亚型。我们在 11a 内确定了一些 Mena11a 特定功能所需的磷酸化位点。来自患者队列的 RNA-seq 数据分析表明,编码组成型 Mena 序列的 mRNA 与包含 11a 外显子的 mRNA 之间的差异与结直肠癌的转移相关,表明 11a 外显子排除会导致侵袭性表型并导致不良的临床结果。
During tumor progression, alternative splicing gives rise to different Mena protein isoforms. We analyzed how Mena11a, an isoform enriched in epithelia and epithelial-like cells, affects Mena-dependent regulation of actin dynamics and cell behavior. While other Mena isoforms promote actin polymerization and drive membrane protrusion, we find that Mena11a decreases actin polymerization and growth factor-stimulated membrane protrusion at lamellipodia. Ectopic Mena11a expression slows mesenchymal-like cell motility, while isoform-specific depletion of endogenous Mena11a in epithelial-like tumor cells perturbs cell:cell junctions and increases membrane protrusion and overall cell motility. Mena11a can dampen membrane protrusion and reduce actin polymerization in the absence of other Mena isoforms, indicating that it is not simply an inactive Mena isoform. We identify a phosphorylation site within 11a that is required for some Mena11a-specific functions. RNA-seq data analysis from patient cohorts demonstrates that the difference between mRNAs encoding constitutive Mena sequences and those containing the 11a exon correlates with metastasis in colorectal cancer, suggesting that 11a exon exclusion contributes to invasive phenotypes and leads to poor clinical outcomes.
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影响因子: 64.5
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