Src SUMOylation Inhibits Tumor Growth Via Decreasing FAK Y925 Phosphorylation.

Src SUMOylation Inhibits Tumor Growth Via Decreasing FAK Y925 Phosphorylation.
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Src SUMOylation 通过减少 FAK Y925 磷酸化抑制肿瘤生长

DOI:
10.1016/j.neo.2017.09.001
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发表时间:
2017-12
期刊:
Neoplasia (New York, N.Y.)
影响因子:
--
通讯作者:
Huang J
Huang J
中科院分区:
其他
文献类型:
--
作者:
Wang J;Deng R;Cui N;Zhang H;Liu T;Dou J;Zhao X;Chen R;Wang Y;Yu J;Huang J

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Src是一种非受体酪氨酸激酶蛋白,在细胞增殖和肿瘤发生中起关键作用。SUMO化是一种可逆的泛素化样翻译后修饰,对肿瘤的进展至关重要。在这里,我们报告的Src蛋白可以SUMO化赖氨酸318在体外和体内。缺氧可诱导Src SUMO化沿着减少,同时Y 419磷酸化增加,Y 419磷酸化是Src活化所需的磷酸化事件。另一方面,用过氧化氢处理可以增强Src SUMO化。值得注意的是,异位表达的SUMO缺陷型突变,Src K318 R,促进肿瘤生长更有力地比野生型Src,如迁移测定,软琼脂测定,和肿瘤异种移植实验。同样,Src SUMO化导致粘着斑激酶(FAK)的Y 925磷酸化减少,这是细胞迁移的一个既定调控事件。我们的研究结果表明,SUMO化Src在赖氨酸318负调节其致癌功能,至少部分抑制Src-FAK复合物的活性。
Src, a non-receptor tyrosine kinase protein, plays a critical role in cell proliferation and tumorigenesis. SUMOylation, a reversible ubiquitination-like post-translational modification, is vital for tumor progression. Here, we report that the Src protein can be SUMOylated at lysine 318 both in vitro and in vivo. Hypoxia can induce a decrease of Src SUMOylation along with an increase of Y419 phosphorylation, a phosphorylation event required for Src activation. On the other hand, treatment with hydrogen peroxide can enhance Src SUMOylation. Significantly, ectopic expression of SUMO-defective mutation, Src K318R, promotes tumor growth more potently than that of wild-type Src, as determined by migration assay, soft agar assay, and tumor xenograft experiments. Consistently, Src SUMOylation leads to a decrease of Y925 phosphorylation of focal adhesion kinase (FAK), an established regulatory event of cell migration. Our results suggest that SUMOylation of Src at lysine 318 negatively modulate its oncogenic function by, at least partially, inhibiting Src-FAK complex activity.
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