DEC1 coordinates with HDAC8 to differentially regulate TAp73 and ΔNp73 expression.

DEC1 coordinates with HDAC8 to differentially regulate TAp73 and ΔNp73 expression.
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DOI:
10.1371/journal.pone.0084015
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Chen X
Chen X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Qian Y;Zhang J;Jung YS;Chen X

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P73 是 p53 家族的成员,在神经发育和肿瘤发生中发挥着关键作用。由于使用两种不同的启动子,p73 表达为两种主要亚型:TAp73 和 ΔNp73,通常具有相反的功能。在这里,我们报道转录因子 DEC1(p53 家族的靶标)对 TAp73 和 ΔNp73 的表达发挥独特的控制作用。特别是,我们发现 DEC1 能够通过 TAp73 启动子的转录激活来增加 TAp73 的表达。相比之下,DEC1 通过 ΔNp73 启动子的转录抑制来抑制 Np73 转录。为了进一步探讨其潜在机制,我们发现在缺乏 HDAC8 的情况下,DEC1 无法增加 TAp73 的表达,这表明 DEC1 增强 TAp73 表达需要 HDAC8。此外,我们发现 DEC1 能够与 HDAC8 相互作用,并将 HDAC8 募集到 TAp73 启动子上,但不能招募到 ΔNp73 启动子上。总之,我们的数据提供了 DEC1 和 HDAC8 差异调节 TAp73 和 ΔNp73 表达的证据,表明这种调节可能为增强肿瘤细胞化疗敏感性的治疗策略奠定基础。
P73, a member of the p53 family, plays a critical role in neural development and tumorigenesis. Due to the usage of two different promoters, p73 is expressed as two major isoforms, TAp73 and ΔNp73, often with opposing functions. Here, we reported that transcriptional factor DEC1, a target of the p53 family, exerts a distinct control of TAp73 and ΔNp73 expression. In particular, we showed that DEC1 was able to increase TAp73 expression via transcriptional activation of the TAp73 promoter. By contrast, Np73 transcription was inhibited by DEC1 via transcriptional repression of the ΔNp73 promoter. To further explore the underlying mechanism, we showed that DEC1 was unable to increase TAp73 expression in the absence of HDAC8, suggesting that HDAC8 is required for DEC1 to enhance TAp73 expression. Furthermore, we found that DEC1 was able to interact with HDAC8 and recruit HDAC8 to the TAp73, but not the ΔNp73, promoter. Together, our data provide evidence that DEC1 and HDAC8 in differentially regulate TAp73 and ΔNp73 expression, suggesting that this regulation may lay a foundation for a therapeutic strategy to enhance the chemosensitivity of tumor cells.
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