The KH-type splicing regulatory protein (KSRP) regulates type III interferon expression post-transcriptionally.

The KH-type splicing regulatory protein (KSRP) regulates type III interferon expression post-transcriptionally.
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KH型剪接调节蛋白(KSRP)在转录后调节III型干扰素表达

DOI:
10.1042/bcj20180522
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发表时间:
2019
期刊:
The Biochemical journal
影响因子:
--
通讯作者:
Kleinert
Kleinert
中科院分区:
--
文献类型:
--
作者:
Schmidtke;Schrick;Saurin;Gather;Weinmann-Menke;Kleinert

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III型干扰素(IFN)是IFN家族的最新成员。它们在免疫防御机制中发挥重要作用,特别是在粘膜部位的抗病毒反应中。此外,它们通过调节中性粒细胞和树突状细胞功能来控制炎症反应。因此,重要的是要确定参与控制III型IFN表达的细胞机制。所有IFN家族成员在其mRNA的3′-非翻译区(3′-UTR)都含有富含AU的元件(战神),其决定mRNA的半衰期,从而决定这些细胞因子的表达水平。mRNA稳定性由与这些战神结合的不同蛋白质控制,从而导致相应靶mRNA的稳定或不稳定。KH型剪接调控蛋白KSRP(也称KHSRP)是ARE基因表达的重要负调控因子。在这里,我们确定干扰素λ 3(IFNL 3)mRNA作为一个新的KSRP目标下拉和免疫沉淀实验,以及荧光素酶报告基因测定。我们对IFNL 33 ′-UTR中KSRP结合位点进行了表征,并证明KSRP调节IFNL 33转录物的mRNA半衰期。此外,我们检测到KSRP−/−小鼠中IFNL 3 mRNA的表达增强,建立了KSRP在体内III型IFN表达中的负调节功能。除KSRP外,RNA结合蛋白AUF 1(富含AU的元件RNA结合蛋白1)似乎也参与III型IFN mRNA表达的调节。
Type III interferons (IFNs) are the latest members of the IFN family. They play an important role in immune defense mechanisms, especially in antiviral responses at mucosal sites. Moreover, they control inflammatory reactions by modulating neutrophil and dendritic cell functions. Therefore, it is important to identify cellular mechanisms involved in the control of type III IFN expression. All IFN family members contain AU-rich elements (AREs) in the 3′-untranslated regions (3′-UTR) of their mRNAs that determine mRNA half-life and consequently the expressional level of these cytokines. mRNA stability is controlled by different proteins binding to these AREs leading to either stabilization or destabilization of the respective target mRNA. The KH-type splicing regulatory protein KSRP (also named KHSRP) is an important negative regulator of ARE-containing mRNAs. Here, we identify the interferon lambda 3 (IFNL3) mRNA as a new KSRP target by pull-down and immunoprecipitation experiments, as well as luciferase reporter gene assays. We characterize the KSRP-binding site in theIFNL33′-UTR and demonstrate that KSRP regulates the mRNA half-life of theIFNL3transcript. In addition, we detect enhanced expression ofIFNL3mRNA in KSRP−/−mice, establishing a negative regulatory function of KSRP in type III IFN expression alsoin vivo. Besides KSRP the RNA-binding protein AUF1 (AU-rich element RNA-binding protein 1) also seems to be involved in the regulation of type III IFN mRNA expression.
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