KIAA1199 promotes metastasis of colorectal cancer cells via microtubule destabilization regulated by a PP2A/stathmin pathway

KIAA1199 promotes metastasis of colorectal cancer cells via microtubule destabilization regulated by a PP2A/stathmin pathway
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KIAA1199 通过 PP2A/stathmin 通路调节的微管不稳定促进结直肠癌细胞的转移

DOI:
10.1038/s41388-018-0493-8
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发表时间:
2018-09
期刊:
影响因子:
8
通讯作者:
Tao Zhang
Tao Zhang
中科院分区:
医学1区
文献类型:
--
作者:
Lei Zhao;Dejun Zhang;Qiong Shen;Min Jin;Zhenyu Lin;Hong Ma;Shaoyi Huang;Pengfei Zhou;Gang Wu;Tao Zhang

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肿瘤转移是晚期结直肠癌死亡的主要原因。我们之前的研究表明,KIAA 1199的上调预测结直肠癌的预后较差,并促进细胞运动和肿瘤转移,其机制尚未完全阐明。在这里,我们证明,沉默KIAA 1199的结直肠癌原位移植肿瘤模型中的肿瘤转移减少的结果。重要的是,我们发现KIAA 1199通过C-末端结构域与蛋白磷酸酶2A(PP 2A)相互作用,并增加PP 2A的磷酸酶活性,这对于KIAA 1199介导的细胞运动是必需的。此外,我们确定stathmin,微管不稳定蛋白,作为下游的KIAA 1199-PP 2A复合物。KIAA 1199诱导的stathmin去磷酸化导致微管不稳定,并导致细胞运动性增强。此外,微管稳定药物紫杉醇可以防止KIAA 1199诱导的微管不稳定,并在体外抑制细胞迁移和侵袭以及在体内抑制结直肠癌的肿瘤转移。总的来说,我们的研究表明,KIAA 1199通过PP 2A/stathmin途径调节微管不稳定促进结直肠癌细胞的转移,并表明KIAA 1199可能是预防结直肠癌转移的有希望的靶点。
Tumor metastasis is the main cause of death in advanced colorectal cancer. Our previous research showed that upregulation of KIAA1199 predicted poorer outcomes, and promoted cell motility and tumor metastasis in colorectal cancer, with the mechanisms not being fully elucidated. Here, we demonstrate that silencing of KIAA1199 results in reduced tumor metastasis in the orthotopic transplantation tumor model of colorectal cancer. Importantly, we find that KIAA1199 interacts.with protein phosphatase 2A (PP2A) through the C-terminal domain and increases phosphatase activity of PP2A, which is essential for KIAA1199-mediated cell motility. Moreover, we identify stathmin, a microtubule-destabilizing protein, as a downstream of KIAA1199-PP2A complex. KIAA1199-induced dephosphorylation of stathmin results in microtubule destabilization and leads to enhanced cell motility. Furthermore, a microtubule-stabilizing drug paclitaxel could prevent KIAA1199-induced microtubule destabilization, and inhibit cell migration and invasion in vitro and tumor metastasis in vivo in colorectal cancer. Collectively, our study reveals that KIAA1199 promotes metastasis of colorectal cancer cells via microtubule destabilization regulated by a PP2A/stathmin pathway, and suggests that KIAA1199 may be a promising target for preventing metastasis in colorectal cancer.
DOI: --
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