Annexin A1 attenuates EMT and metastatic potential in breast cancer.

Annexin A1 attenuates EMT and metastatic potential in breast cancer.
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DOI:
10.1002/emmm.201000095
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发表时间:
2010-10
影响因子:
11.1
通讯作者:
Beug, Hartmut
Beug, Hartmut
中科院分区:
医学1区
文献类型:
--
作者:
Maschler, Sabine;Gebeshuber, Christoph A.;Wiedemann, Eva-Maria;Alacakaptan, Memetcan;Schreiber, Martin;Custic, Ivana;Beug, Hartmut

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转移是肿瘤死亡的主要原因,但其机制尚不清楚。转移关键涉及上皮向间充质转化(EMT),导致上皮极性的丧失。在这里,我们发现Annexin A1(AnxA1),一种在细胞内小泡运输中具有重要功能的蛋白质,是乳腺癌EMT和转移的有效抑制因子。AnxA1在乳腺上皮细胞的EMT、转移的小鼠和人细胞系以及转移的小鼠和人的癌细胞中显著降低。RNA干扰介导的AnxA1基因敲除与致癌RAS协同诱导转化生长因子β非依赖性内膜转移和非转移细胞的转移。引人注目的是,在转移的小鼠和人乳腺癌细胞中强制表达AnxA1逆转了EMT并消除了转移。AnxA1基因敲除可刺激多条信号通路,但只有TYK2/STAT3和ERK1/2信号通路是EMT所必需的。
Metastasis is the major cause of carcinoma-induced death, but mechanisms involved are poorly understood. Metastasis crucially involves epithelial-to-mesenchymal transition (EMT), causing loss of epithelial polarity. Here we identify Annexin A1 (AnxA1), a protein with important functions in intracellular vesicle trafficking, as an efficient suppressor of EMT and metastasis in breast cancer. AnxA1 levels were strongly reduced in EMT of mammary epithelial cells, in metastatic murine and human cell lines and in metastatic mouse and human carcinomas. RNAi-mediated AnxA1 knockdown cooperated with oncogenic Ras to induce TGFβ-independent EMT and metastasis in non-metastatic cells. Strikingly, forced AnxA1 expression in metastatic mouse and human mammary carcinoma cells reversed EMT and abolished metastasis. AnxA1 knockdown stimulated multiple signalling pathways but only Tyk2/Stat3 and Erk1/2 signalling were essential for EMT.
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