Coupling S100A4 to Rhotekin alters Rho signaling output in breast cancer cells.

Coupling S100A4 to Rhotekin alters Rho signaling output in breast cancer cells.
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DOI:
10.1038/onc.2012.383
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发表时间:
2013-08-08
期刊:
影响因子:
8
通讯作者:
O'Connor, K. L.
O'Connor, K. L.
中科院分区:
医学1区
文献类型:
--
作者:
Chen, M.;Bresnick, A. R.;O'Connor, K. L.

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人们越来越认识到 Rho 信号传导有助于侵袭和转移。在这项研究中,我们发现转移相关蛋白 S100A4 与 Rhotekin 的 Rho 结合域 (RBD) 相互作用,从而将 S100A4 与 Rho 通路连接起来。 GST 下拉和免疫沉淀测定表明,S100A4 特异性且直接结合 Rhotekin RBD,但不结合其他 Rho 效应子 RBD。 S100A4 与 Rhotekin 的结合是钙依赖性的,并且使用与活性 Rho 结合的残基不同的残基。有趣的是,我们发现S100A4和Rhotekin可以与活性RhoA形成复合物。使用 RNAi,我们确定抑制 S100A4 和 Rhotekin 会导致 EGF 响应的 Rho 依赖性膜褶皱消失,收缩性 F-肌动蛋白“应力”纤维增加,并阻止三维培养中的侵袭性生长。因此,我们的数据表明,S100A4 和 Rhotekin 的相互作用允许 S100A4 与 RhoA 复合,并将 Rho 功能从应力纤维形成转变为膜褶皱,从而赋予侵入表型。
Rho signaling is increasingly recognized to contribute to invasion and metastasis. In this study, we discovered that metastasis-associated protein S100A4 interacts with the Rho binding domain (RBD) of Rhotekin, thus connecting S100A4 to the Rho pathway. GST pull-down and immunoprecipitation assays demonstrated that S100A4 specifically and directly binds to Rhotekin RBD, but not other Rho effector RBDs. S100A4 binding to Rhotekin is calcium-dependent and uses residues distinct from those bound by active Rho. Interestingly, we found that S100A4 and Rhotekin can form a complex with active RhoA. Using RNAi, we determined that suppression of both S100A4 and Rhotekin leads to loss of Rho-dependent membrane ruffling in response to EGF, an increase in contractile F-actin “stress” fibers, and blocked invasive growth in three-dimensional culture. Accordingly, our data suggest that interaction of S100A4 and Rhotekin permits S100A4 to complex with RhoA and switch Rho function from stress fiber formation to membrane ruffling to confer an invasive phenotype.
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