Epstein-Barr Virus encoded LMP1 regulates cyclin D1 promoter activity by nuclear EGFR and STAT3 in CNE1 cells.

Epstein-Barr Virus encoded LMP1 regulates cyclin D1 promoter activity by nuclear EGFR and STAT3 in CNE1 cells.
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Epstein-Barr病毒编码的LMP1通过核EGFR和STAT3在CNE1细胞中调节细胞周期蛋白D1启动子活性

DOI:
10.1186/1756-9966-32-90
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发表时间:
2013-11-13
期刊:
Journal of experimental & clinical cancer research : CR
影响因子:
--
通讯作者:
Cao Y
Cao Y
中科院分区:
其他
文献类型:
--
作者:
Xu Y;Shi Y;Yuan Q;Liu X;Yan B;Chen L;Tao Y;Cao Y

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EB病毒(Epstein-Barr virus,EBV)的主要癌蛋白潜伏膜蛋白1(latent membrane protein 1,LMP 1)与鼻咽癌(nasopharyngeal carcinoma,NPC)密切相关。表皮生长因子受体(EGFR)是一种广泛表达的受体酪氨酸激酶,在肿瘤发生中起重要作用。信号转导子和转录激活子3(STAT 3)是细胞增殖和凋亡的主要转录调控因子。我们的前期研究表明,在LMP 1存在的情况下,细胞核EGFR可以直接与cyclin D1启动子结合,而EGFR与STAT 3在NPC中的相关性还有待进一步探讨。在这里,我们已经表明,EGFR和STAT 3的相互作用在LMP 1的存在下,在细胞核中增加。LMP 1促进EGFR和STAT 3与细胞周期蛋白D1的启动子区结合,进而增强细胞周期蛋白D1的启动子活性。此外,我们证明了小分子干扰EGFR和STAT 3活性会降低细胞周期蛋白D1的转录活性和mRNA水平。这些发现可能为EGFR和STAT 3信号通路与LMP 1激活cyclin D1在NPC癌变过程中的作用提供了新的联系。
The principal Epstein–Barr virus (EBV) oncoprotein, latent membrane protein 1 (LMP1) is strongly associated with nasopharyngeal carcinoma (NPC), a prevalent cancer in China. The epidermal growth factor receptor (EGFR) is important in carcinogenesis, as it is a ubiquitously expressed receptor tyrosine kinase. Signal transducer and activator of transcription 3 (STAT3) is a master transcriptional regulator in proliferation and apoptosis. Our previous study demonstrated that the nuclear EGFR could bind to the cyclin D1 promoter directly in the presence of LMP1, and the correlation between EGFR and STAT3 in NPC remains to be further explored. Here, we have shown that the interaction of EGFR and STAT3 increased in the nucleus in the presence of LMP1. LMP1 promoted both EGFR and STAT3 binding to the promoter region of cyclin D1, in turn, enhancing the promoter activity of cyclin D1. Furthermore, we demonstrated that both transcriptional activity and mRNA levels of cyclin D1 were decreased by small molecule interference of EGFR and STAT3 activity. These findings may provide a novel linkage between the EGFR and STAT3 signaling pathways and the activation of cyclin D1 by LMP1 in the carcinogenesis of NPC.
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