Palladin contributes to invasive motility in human breast cancer cells.

Palladin contributes to invasive motility in human breast cancer cells.
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DOI:
10.1038/onc.2008.408
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发表时间:
2009-01-29
期刊:
影响因子:
8
通讯作者:
Otey, C. A.
Otey, C. A.
中科院分区:
医学1区
文献类型:
--
作者:
Goicoechea, S. M.;Bednarski, B.;Garcia-Mata, R.;Prentice-Dunn, H.;Kim, H. J.;Otey, C. A.

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癌症转移涉及多个步骤,包括转移细胞脱离相邻细胞,获取运动和侵袭到其他组织。所有这些步骤都需要重组肌动蛋白细胞骨架。在这项研究中,我们发现,与良性乳腺组织相比,蛋白质palladin是肌动蛋白组织中具有重要功能的分子支架,在肿瘤的总体水平较高,并且在四种浸润性乳腺癌细胞系中,与相比四个非侵入性细胞系。此外,我们发现palladin在足体形成中起关键作用。足体是富含肌动蛋白的结构,可在粘附和基质降解中起作用,并在许多侵入性细胞类型中发现。我们的结果表明,佛波酯治疗刺激了侵入性含paldin的足体的形成,但在非侵入性细胞系中却没有。更重要的是,Palladin敲低导致足体的形成减少,而Transwell迁移和侵入性运动显着降低。 palladin过表达在非侵入性MCF7细胞中诱导的足体形成,否则这些细胞无法形成足体,这表明palladin在足体组装中起着至关重要的作用。总体而言,这些结果表明帕拉丁的过表达有助于转移细胞的侵入性行为。
Cancer metastasis involves multiple steps including detachment of the metastatic cells from neighboring cells, the acquisition of motility and invasion to other tissue. All of these steps require the reorganization of the actin cytoskeleton. In this study, we found that the protein palladin, a molecular scaffold with an important function in actin organization, is expressed at higher overall levels in tumors compared to benign breast tissue, and also significantly higher in four invasive breast cancer cell lines when compared to four non-invasive cell lines. In addition, we found that palladin plays a key role in the formation of podosomes. Podosomes are actin-rich structures that function in adhesion and matrix degradation and have been found in many invasive cell types. Our results show that phorbol ester treatment stimulated the formation of palladin-containing podosomes in invasive, but not in non-invasive cell lines. More importantly, palladin knockdown resulted in decreased podosome formation and a significant reduction in transwell migration and invasive motility. Palladin overexpression induced podosome formation in the non-invasive MCF7 cells, which are otherwise unable to form podosomes, suggesting that palladin plays a critical role in the assembly of podosomes. Overall, these results indicate that palladin overexpression contributes to the invasive behavior of metastatic cells.
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