Piwil2 suppresses p53 by inducing phosphorylation of signal transducer and activator of transcription 3 in tumor cells.

Piwil2 suppresses p53 by inducing phosphorylation of signal transducer and activator of transcription 3 in tumor cells.
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Piwil2 通过诱导肿瘤细胞中信号转导蛋白和转录激活剂 3 的磷酸化来抑制 P53

DOI:
10.1371/journal.pone.0030999
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Ma Y
Ma Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Lu Y;Zhang K;Li C;Yao Y;Tao D;Liu Y;Zhang S;Ma Y

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Piwi蛋白参与了从果蝇到哺乳动物的生殖细胞增殖、分化、生殖干细胞维持和转座子控制。Piwi-like 2(piwil 2)基因主要在正常组织中的睾丸或胚胎细胞中表达,但在肿瘤中广泛表达。然而,piwil 2通过何种机制参与肿瘤发生仍有待完全确定。在这里,我们报告说,人类piwil 2,或Hili抑制肿瘤抑制基因P53在人类癌细胞。免疫沉淀分析表明Piwil 2可通过PAZ结构域与信号转导和转录激活因子3(STAT 3)蛋白直接结合,形成Piwil 2/STAT 3/c-Src三蛋白复合物。此外,STAT 3被c-Src磷酸化并转位至细胞核,然后与P53启动子结合并抑制其转录。本研究证实Piwil 2在具有P53作为STAT 3信号通路的正调控因子的肿瘤细胞中具有抗凋亡作用,为Piwil 2在肿瘤发生中的作用提供了新的视角。
Piwi proteins have been implicated in germ cell proliferation, differentiation, germline stem cell maintenance and transposon control in germline from Drosophila to mammals. The Piwi-like2 (piwil2) gene is mainly expressed in testis or embryonic cells among normal tissues but widely expressed in tumors. However, it remains to be fully determined through which mechanism piwil2 is involved in tumorigenesis. Here we report that Human piwil2, or Hili represses the tumor suppressor P53 in human cancer cells. Immunoprecipitation analysis shows that Piwil2 can directly associate with Signal Transducer and Activator of Transcription 3 (STAT3) protein via its PAZ domain and form a Piwil2/STAT3/c-Src triple protein-protein complex. Furthermore, STAT3 is phosphorylated by c-Src and translocated to nucleus, then binds to P53 promoter and represses its transcription. The present study demonstrated that Piwil2 plays a role in anti-apoptosis in tumor cells possessing P53 as a positive regulator of STAT3 signaling pathway, providing novel sights into roles of Piwil2 in tumorigenesis.
DOI: 10.1128/mcb.18.5.2553
发表时间: 1998-05-01
影响因子: 5.3
作者:
Bromberg, JF;Horvath, CM;Darnell, JE
通讯作者: Darnell, JE
DOI: 10.1038/sj.onc.1205426
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DOI: 10.1016/s0092-8674(00)81959-5
发表时间: 1999-08-06
期刊: CELL
影响因子: 64.5
作者:
Bromberg, JF;Wrzeszczynska, MH;Darnell, JE
通讯作者: Darnell, JE