Reduction of AUF1-mediated follistatin mRNA decay during glucose starvation protects cells from apoptosis.

Reduction of AUF1-mediated follistatin mRNA decay during glucose starvation protects cells from apoptosis.
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葡萄糖饥饿期间 AUF1 介导的卵泡抑素 mRNA 衰减的减少可保护细胞免于凋亡。

DOI:
10.1093/nar/gku778
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发表时间:
2014
影响因子:
14.9
通讯作者:
Xu Z
Xu Z
中科院分区:
生物学2区
文献类型:
--
作者:
Gao X;Dong H;Lin C;Sheng J;Zhang F;Su J;Xu Z

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卵泡抑素(Follistatin, FST)在细胞中具有多种重要功能,包括在应激状态下防止细胞凋亡。FST的表达在葡萄糖剥夺反应中上调,机制未知。我们在此表明,葡萄糖剥夺诱导FST是由于其mRNA半衰期的增加。我们进一步在FST mRNA的3'UTR中发现了一个富au元素(ARE),介导了FST mRNA的衰变。FST表达在敲低AUF1后升高,在进一步表达AUF1时降低。体外结合实验和RNA下拉实验显示AUF1通过其ARE直接与FST mRNA相互作用。在葡萄糖剥夺过程中,大部分AUF1从细胞质穿梭到细胞核,导致AUF1与FST mRNA分离,从而稳定FST mRNA。最后,AUF1的下调减少,而AUF1的过表达增加了葡萄糖剥夺诱导的细胞凋亡。在表达FST的细胞中,AUF1的促凋亡作用被消除。综上所述,本研究证明AUF1是FST表达的负调节因子,参与葡萄糖剥夺下细胞存活的调节。
Follistatin (FST) performs several vital functions in the cells, including protection from apoptosis during stress. The expression of FST is up-regulated in response to glucose deprivation by an unknown mechanism. We herein showed that the induction of FST by glucose deprivation was due to an increase in the half-life of its mRNA. We further identified an AU-rich element (ARE) in the 3′UTR of FST mRNA that mediated its decay. The expression of FST was elevated after knocking down AUF1 and reduced when AUF1 was further expressed. In vitro binding assays and RNA pull-down assays revealed that AUF1 interacted with FST mRNA directly via its ARE. During glucose deprivation, a majority of AUF1 shuttled from cytoplasm to nucleus, resulting in dissociation of AUF1 from FST mRNA and thus stabilization of FST mRNA. Finally, knockdown of AUF1 decreased whereas overexpression of AUF1 increased glucose deprivation-induced apoptosis. The apoptosis promoting effect of AUF1 was eliminated in FST expressing cells. Collectively, this study provided evidence that AUF1 is a negative regulator of FST expression and participates in the regulation of cell survival under glucose deprivation.
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