Coordinated expression of tristetraprolin post-transcriptionally attenuates mitogenic induction of the oncogenic Ser/Thr kinase Pim-1.

Coordinated expression of tristetraprolin post-transcriptionally attenuates mitogenic induction of the oncogenic Ser/Thr kinase Pim-1.
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DOI:
10.1371/journal.pone.0033194
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Wilson GM
Wilson GM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Mahat DB;Brennan-Laun SE;Fialcowitz-White EJ;Kishor A;Ross CR;Pozharskaya T;Rawn JD;Blackshear PJ;Hassel BA;Wilson GM

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丝氨酸/苏氨酸激酶Pim-1指导促进细胞生长和存活的选定信号事件,并在多种人类癌症中过表达。Pim-1的表达通过多种机制受到严格控制,包括mRNA周转的调节。在几种培养的细胞模型中,促有丝分裂刺激迅速诱导并稳定PIM 1 mRNA,然而,4-6小时后的剧烈去稳定化有助于恢复基础表达水平。PIM 1 mRNA周转的加速与tristetraprolin(TTP)的积累相一致,TTP是一种mRNA不稳定蛋白,靶向含有富含AU元素的转录本。TTP结合细胞中的PIM 1 mRNA,并通过加速mRNA衰变来抑制其表达。报告基因mRNA衰变分析将TTP调节的mRNA衰变元件定位于结合TTP的远端3′-非翻译区中的离散的富含AU的序列。这些数据表明,TTP和PIM 1表达的协调刺激限制了PIM 1 mRNA积累的幅度和持续时间,随着TTP蛋白水平的增加,加速其降解。与该模型一致,PIM 1和TTP mRNA水平在选定的人体组织组中具有良好的相关性,并且在来自TTP缺陷小鼠的有丝分裂原刺激的成纤维细胞中,PIM 1 mRNA被诱导至显著更高的水平。总之,这些数据支持一种模型,即诱导TTP介导的负反馈回路,以限制选择的促分裂原激活基因的表达。
The serine/threonine kinase Pim-1 directs selected signaling events that promote cell growth and survival and is overexpressed in diverse human cancers. Pim-1 expression is tightly controlled through multiple mechanisms, including regulation of mRNA turnover. In several cultured cell models, mitogenic stimulation rapidly induced and stabilized PIM1 mRNA, however, vigorous destabilization 4–6 hours later helped restore basal expression levels. Acceleration of PIM1 mRNA turnover coincided with accumulation of tristetraprolin (TTP), an mRNA-destabilizing protein that targets transcripts containing AU-rich elements. TTP binds PIM1 mRNA in cells, and suppresses its expression by accelerating mRNA decay. Reporter mRNA decay assays localized the TTP-regulated mRNA decay element to a discrete AU-rich sequence in the distal 3′-untranslated region that binds TTP. These data suggest that coordinated stimulation of TTP and PIM1 expression limits the magnitude and duration of PIM1 mRNA accumulation by accelerating its degradation as TTP protein levels increase. Consistent with this model, PIM1 and TTP mRNA levels were well correlated across selected human tissue panels, and PIM1 mRNA was induced to significantly higher levels in mitogen-stimulated fibroblasts from TTP-deficient mice. Together, these data support a model whereby induction of TTP mediates a negative feedback circuit to limit expression of selected mitogen-activated genes.
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