ZAS3 accentuates transforming growth factor β signaling in epithelial cells.

ZAS3 accentuates transforming growth factor β signaling in epithelial cells.
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DOI:
10.1016/j.cellsig.2010.08.009
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发表时间:
2011-01
影响因子:
4.8
通讯作者:
Barnard JA
Barnard JA
中科院分区:
生物学2区
文献类型:
--
作者:
Yakovich AJ;Jiang B;Allen CE;Du J;Wu LC;Barnard JA

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在哺乳动物中,转录因子 ZAS 家族根据细胞环境激活或抑制转录。在当前的研究中,我们利用 HEK293 细胞和肠上皮细胞系 RIE-1 探索了上皮细胞中 ZAS3 和 TGFβ1 信号传导之间的相互作用。在每个细胞系和小鼠小肠中均检测到内源性 ZAS3 表达。此外,TGFβ1 以及 TGFβ 过表达小鼠体内的全细胞和核裂解物中的内源性 ZAS3 表达均增加,表明 ZAS3 和 TGFβ 之间存在潜在的相互作用。 ZAS3 转染增强了 HEK293 和 RIE-1 细胞中荧光素酶报告基因 TGFβ1 的激活。对截短的 ZAS3 构建体的分析揭示了氨基酸 106 和 261 之间的 155 个氨基酸的 N 端序列,这是增强 TGFβ1 介导的转录所必需的。使用 TGFβ1 刺激的 HEK293 细胞的核提取物进行的免疫共沉淀实验揭示了 ZAS3 和 Smad 复合物之间的关联。此外,转染的 ZAS3 降低了 Smad 复合物与 TGFβ 转录抑制因子 Ski 和 SnoN 之间的关联,表明外源 ZAS3 增强转录的可能机制。这些观察结果通过与 Ski 和 SnoN 中 Smad 相互作用结构域同源的 ZAS 结构域的定点诱变得到证实。最后,ZAS3 转染增强了 HEK293 细胞中 TGFβ1 介导的 α-平滑肌肌动蛋白的诱导,表明 ZAS3 在 TGFβ 信号传导中发挥功能性作用。总之,我们发现了 ZAS3 和 Smad 蛋白之间的相互作用,可以增强 TGFβ 信号传导。由于 TGFβ 信号传导主要被认为是负向调节途径,因此 ZAS3 信号传导的增强对于理解 TGFβ 生物学具有新的意义。
In mammals, the ZAS family of transcription factors activates or represses transcription depending on the cellular context. In the current study, we explored the interaction between ZAS3 and TGFβ1 signaling in epithelial cells using HEK293 cells and the intestinal epithelial cell line, RIE-1. Endogenous ZAS3 expression was detected in each cell line and the small intestine of mice. Additionally, endogenous ZAS3 expression was increased in both whole cell and nuclear lysates by TGFβ1 and in vivo in TGFβ-overexpressing mice, indicating a potential interaction between ZAS3 and TGFβ. ZAS3 transfection enhanced TGFβ1 activation of a luciferase reporter in both HEK293 and RIE-1 cells. Analysis of truncated ZAS3 constructs revealed a 155 amino acid, N-terminal sequence between amino acids 106 and 261 that was required for enhancement of TGFβ1-mediated transcription. Coimmunoprecipitation experiments with nuclear extracts from TGFβ1-stimulated HEK293 cells revealed an association between ZAS3 and the Smad complex. Additionally, transfected ZAS3 decreased the association between the Smad complex and the TGFβ transcriptional repressors Ski and SnoN, indicating a possible mechanism for the enhancement of transcription by exogenous ZAS3. These observations were confirmed by site-directed mutagenesis of ZAS domains homologous with Smad-interacting domains in Ski and SnoN. Finally, ZAS3 transfection enhanced the TGFβ1-mediated induction of α-smooth muscle actin in HEK293 cells, indicating that ZAS3 plays a functional role in TGFβ signaling. In conclusion, we have identified an interaction between ZAS3 and Smad proteins that enhances TGFβ signaling. Since TGFβ signaling is primarily known as a negatively regulated pathway, the enhancement of signaling by ZAS3 has novel implications for understanding TGFβ biology.
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