A novel function for Cyclin A2: control of cell invasion via RhoA signaling.

A novel function for Cyclin A2: control of cell invasion via RhoA signaling.
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DOI:
10.1083/jcb.201102085
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发表时间:
2012-01-09
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Blanchard JM
Blanchard JM
中科院分区:
其他
文献类型:
--
作者:
Arsic N;Bendris N;Peter M;Begon-Pescia C;Rebouissou C;Gadéa G;Bouquier N;Bibeau F;Lemmers B;Blanchard JM

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细胞周期蛋白A2促进RhoA激活,抑制细胞骨架重排和细胞迁移。细胞周期蛋白A2在细胞周期调控中起关键作用。它在胚胎细胞和造血谱系中是必需的,但在成纤维细胞中是必需的。在本文中,我们表明,细胞周期蛋白A2耗尽的细胞显示皮质分布的肌动蛋白丝和迁移增加。这些缺陷被拯救的恢复野生型细胞周期蛋白A2,它直接与RhoA相互作用,或由细胞周期蛋白A2突变体不能与Cdk。在体外,细胞周期蛋白A2增强RhoA特异性鸟嘌呤核苷酸交换因子的交换活性。与此一致,细胞周期蛋白A2耗竭通过下调RhoA活性增强成纤维细胞的迁移和转化细胞的侵袭力。此外,在匹配的人类肿瘤中,相对于原发性结肠腺癌,转移灶中细胞周期蛋白A2的表达较低。总之,这些数据表明,细胞周期蛋白A2通过促进RhoA激活负控制细胞运动性,从而证明了细胞周期蛋白A2在细胞骨架重排和细胞迁移中的新功能。
Cyclin A2 promotes RhoA activation, which inhibits cytoskeletal rearrangements and cell migration. Cyclin A2 plays a key role in cell cycle regulation. It is essential in embryonic cells and in the hematopoietic lineage yet dispensable in fibroblasts. In this paper, we demonstrate that Cyclin A2–depleted cells display a cortical distribution of actin filaments and increased migration. These defects are rescued by restoration of wild-type Cyclin A2, which directly interacts with RhoA, or by a Cyclin A2 mutant unable to associate with Cdk. In vitro, Cyclin A2 potentiates the exchange activity of a RhoA-specific guanine nucleotide exchange factor. Consistent with this, Cyclin A2 depletion enhances migration of fibroblasts and invasiveness of transformed cells via down-regulation of RhoA activity. Moreover, Cyclin A2 expression is lower in metastases relative to primary colon adenocarcinoma in matched human tumors. All together, these data show that Cyclin A2 negatively controls cell motility by promoting RhoA activation, thus demonstrating a novel Cyclin A2 function in cytoskeletal rearrangements and cell migration.
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