PAK5-mediated AIF phosphorylation inhibits its nuclear translocation and promotes breast cancer tumorigenesis.

PAK5-mediated AIF phosphorylation inhibits its nuclear translocation and promotes breast cancer tumorigenesis.
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PAK5介导的AIF磷酸化抑制其核转位并促进乳腺癌肿瘤发生

DOI:
10.7150/ijbs.58102
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发表时间:
2021
影响因子:
9.2
通讯作者:
Li F
Li F
中科院分区:
生物学2区
文献类型:
--
作者:
Xing Y;Li Y;Hu B;Han F;Zhao X;Zhang H;Li Y;Li D;Li J;Jin F;Li F

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虽然p21激活激酶5(PAK 5)与多种癌症的进展有关,但其在乳腺癌中的生物学功能尚不清楚。凋亡诱导因子(Apoptosis-inducing factor,AIF)是线粒体中一种重要的凋亡因子,可从线粒体释放进入细胞核,引起非半胱天冬酶依赖的细胞凋亡。在这项研究中,我们发现PAK 5通过阻止AIF的核转位来抑制凋亡。PAK 5通过降低线粒体膜通透性和增加膜电位来抑制乳腺癌细胞中线粒体释放AIF。此外,PAK 5还可使AIF在Thr 281位点磷酸化,抑制AIF/importin α3复合物的形成,从而减少AIF的核转位。在功能上,我们证明PAK 5介导的AIF磷酸化促进乳腺癌细胞的增殖,并加速乳腺癌在体内的生长。值得注意的是,PAK 5和AIF在乳腺癌中的表达与患者预后不良呈正相关。PAK 5表达与AIF核转位呈负相关。提示PAK 5-AIF信号通路可能在乳腺肿瘤的发生发展中起重要作用,为乳腺癌的治疗提供了新的靶点。
Although p21 activated kinase 5 (PAK5) is related to the progression of multiple cancers, its biological function in breast cancer remains unclear. Apoptosis-inducing factor (AIF) is a vital apoptosis factor in mitochondria, which can be released from mitochondria and enter the nucleus, causing caspase-independent apoptosis. In this study, we reveal that PAK5 inhibits apoptosis by preventing the nuclear translocation of AIF. PAK5 inhibits the release of AIF from mitochondria in breast cancer cells by decreasing the mitochondria membrane permeability and increasing the membrane potential. Furthermore, PAK5 phosphorylates AIF at Thr281 site to inhibit the formation of AIF/importin α3 complex, leading to decrease AIF nuclear translocation. Functionally, we demonstrate that PAK5-mediated AIF phosphorylation promotes the proliferation of breast cancer cells and accelerates the growth of breast cancer in vivo. Significantly, PAK5 and AIF expression in breast cancer are positively correlated with poor patient prognosis. PAK5 expression is negatively correlated with AIF nuclear translocation. These results suggest that PAK5-AIF signaling pathway may play an essential role in mammary tumorigenesis, providing a new therapeutic target for the treatment of breast cancer.
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