Loss of tumor suppressor inositol polyphosphate 4-phosphatase type B impairs DNA double-strand break repair by destabilization of DNA tethering protein Rad50
Loss of tumor suppressor inositol polyphosphate 4-phosphatase type B impairs DNA double-strand break repair by destabilization of DNA tethering protein Rad50
复制标题
肿瘤抑制因子肌醇多磷酸 4-磷酸酶 B 型的缺失会通过 DNA 束缚蛋白 Rad50 的不稳定来损害 DNA 双链断裂修复
DOI:
10.1038/s41419-020-2491-3
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发表时间:
2020-04
影响因子:
9
通讯作者:
Chunshui Zhou
中科院分区:
文献类型:
--
作者:
Yue Sun;Xuelian Ning;Jiankun Fan;Ji;ong Hu;Yanting Jiang;Ziqi Hu;Joao A. Paulo;Jichao Liu;Xiaohong Qiu;Hui Xu;Songbin Fu;Steven P. Gygi;Jinwei Zhang;Chunshui Zhou
Genome instability is the fundamental hallmark of malignant tumors. Tumor suppressors often play a role in maintaining genome stability. Our previous genetic screen identified inositol polyphosphate 4-phosphatase type B (INPP4B), primarily hydrolyzing phosphatidylinositol 3, 4-disphosphate, is a potential tumor suppressor in lung cancer cells. How INPP4B regulates the genome stability of lung cancer cells is unclear. Here we report knockout of INPP4B in lung adenocarcinoma A549 cells by Crispr-Cas9 gene editing leads to sensitization to ionizing radiation (IR), PARP inhibitor olaparib and impaired DNA homologous recombination repair. Re-introduction of a Crispr-Cas9 resistant INPP4B gene in the INPP4B knockout cells partially restored their resistance to IR, indicating loss of INPP4B protein is relevant to the increased IR sensitivity. Furthermore, we showed ectopic expressed INPP4B in A549 cells responds to IR irradiation by redistribution from cytoplasm to nucleus and endogenous INPP4B protein interacts with Rad50, a crucial MRN complex component for tethering DNA double-strand breaks. Loss of INPP4B protein results in decreased stability of Rad50 in vivo, suggesting an unanticipated role of tumor suppressor INPP4B in maintaining genome integrity via facilitating Rad50 mediated DNA double-strand break repair. Taken together, our findings support a dual role of INPP4B in suppression of tumorigenesis by safeguarding genome stability, as well as inhibiting of PI3K-Akt-mTOR signaling, and offer a new therapeutic strategy for personalized cancer treatment to patients with INPP4B defects or deficiency in the clinic.
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DOI:
10.1111/j.1365-2613.2010.00734.x
发表时间:
2010-12-01
影响因子:
3
作者:
Barry, Sean P.;Townsend, Paul A.;Stephanou, Anastasis
通讯作者:
Stephanou, Anastasis
影响因子:
--
作者:
Ip LR;Poulogiannis G;Viciano FC;Sasaki J;Kofuji S;Spanswick VJ;Hochhauser D;Hartley JA;Sasaki T;Gewinner CA
通讯作者:
Gewinner CA
影响因子:
64.5
作者:
Song MS;Carracedo A;Salmena L;Song SJ;Egia A;Malumbres M;Pandolfi PP
通讯作者:
Pandolfi PP
影响因子:
8
作者:
Li Y;Sun H;Zhang C;Liu J;Zhang H;Fan F;Everley RA;Ning X;Sun Y;Hu J;Liu J;Zhang J;Ye W;Qiu X;Dai S;Liu B;Xu H;Fu S;Gygi SP;Zhou C
通讯作者:
Zhou C
影响因子:
6.4
作者:
Fan, Cong;Zhang, Juan;Xie, Yuntao
通讯作者:
Xie, Yuntao