Activator protein 2 alpha (AP2alpha) suppresses 42 kDa C/CAAT enhancer binding protein alpha (p42(C/EBPalpha)) in head and neck squamous cell carcinoma.

Activator protein 2 alpha (AP2alpha) suppresses 42 kDa C/CAAT enhancer binding protein alpha (p42(C/EBPalpha)) in head and neck squamous cell carcinoma.
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DOI:
10.1002/ijc.24087
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发表时间:
2009-03-15
影响因子:
6.4
通讯作者:
Plass, Christoph
Plass, Christoph
中科院分区:
医学1区
文献类型:
--
作者:
Bennett, Kristi L.;Romigh, Todd;Arab, Khelifa;Teresi, Rosemary E.;Tada, Yasuhiro;Eng, Charis;Plass, Christoph

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肿瘤抑制因子C/CAAT增强子结合蛋白α(C/EBPα)是一种参与细胞周期调控和细胞分化的转录因子。最近的一项研究表明,C/EBPα在头颈部鳞状细胞癌(HNSCC)中经常通过上游调控区的DNA甲基化下调。我们研究了HNSCC中上游调控区的DNA甲基化如何破坏C/EBPα的转录调控。结果表明,异常甲基化与甲基结合结构域蛋白结合和抑制性组蛋白修饰相关。该甲基化区域含有以前未研究的AP 2 α结合位点。AP 2 α抑制C/EBPα启动子活性和蛋白表达。有趣的是,通过shRNA沉默AP 2 α增加了C/EBPα(p42 C/EBPα)的抗增殖亚型。此外,生长分析显示,这两种亚型在HNSCC中产生非常不同的增殖特性。
The tumor suppressor C/CAAT enhancer binding protein alpha (C/EBPα) is a transcription factor involved in cell cycle control and cellular differentiation. A recent study showed that C/EBPα is frequently downregulated in Head and Neck Squamous Cell carcinoma (HNSCC) by DNA methylation in an upstream regulatory region. Here we investigated how DNA methylation in the upstream regulatory region disrupts the transcriptional regulation of C/EBPα in HNSCC. The results reveal that aberrant methylation correlates with Methyl Binding Domain protein binding and repressive histone modifications. This methylated region contains previously uninvestigated AP2α binding sites. AP2α suppresses C/EBPα promoter activity and protein expression. Interestingly, silencing AP2α by shRNA increases the anti-proliferative isoform of C/EBPα (p42C/EBPα). Furthermore, growth analysis revealed that these two isoforms yield very different proliferative properties in HNSCC.
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