miR-346 controls release of TNF-α protein and stability of its mRNA in rheumatoid arthritis via tristetraprolin stabilization.

miR-346 controls release of TNF-α protein and stability of its mRNA in rheumatoid arthritis via tristetraprolin stabilization.
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DOI:
10.1371/journal.pone.0019827
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Wachsmann D
Wachsmann D
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Semaan N;Frenzel L;Alsaleh G;Suffert G;Gottenberg JE;Sibilia J;Pfeffer S;Wachsmann D

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肿瘤坏死因子-α是类风湿性关节炎的主要细胞因子。它的表达在转录和转录后水平都受到调控,最近的研究表明,miRNAs参与了巨噬细胞的肿瘤坏死因子-α反应。从类风湿关节炎患者分离的脂多糖激活的FL表达α-TRAN m RNA,但不表达成熟蛋白。这促使我们寻找可能与这种抗炎作用有关的miRNAs。利用基因芯片,我们发现两个miRNAs,miR-125b和miR-939,被预测为靶向α-α的3‘-UTR区,在RA FLS中对内毒素有上调作用,但它们的抑制不能恢复FLS中成熟的肿瘤坏死因子-UTR的表达。我们先前的研究表明,在脂多糖激活的FLS中上调的miR-346可以抑制BTK的表达,从而稳定肿瘤坏死因子-α的表达。阻断miR346可使活化的FLS恢复肿瘤坏死因子α的表达。有趣的是,在脂多糖激活的THP-1细胞中,miR346基因的转染抑制了肿瘤坏死因子-α的分泌。我们还证明了抑制肿瘤坏死因子-α合成的核糖核酸结合蛋白TTP在激活的FL中过表达,而抑制miR-346则降低了它的表达。反之,反之,在脂多糖激活的THP-1细胞中,miR346的表达增加,并抑制肿瘤坏死因子-α的释放。这些结果表明miR346通过调节TTP的表达来控制肿瘤坏死因子-α的合成。
TNF-α is a major cytokine implicated in rheumatoid arthritis. Its expression is regulated both at the transcriptional and posttranscriptional levels and recent data demonstrated that miRNAs are implicated in TNF-α response in macrophages. LPS-activated FLS isolated from RA patients express TNF-α mRNA but not the mature protein. This prompted us to look for miRNAs which could be implicated in this anti-inflammatory effect. Using a microarray, we found two miRNAs, miR-125b and miR-939 predicted to target the 3′-UTR of TNF-α mRNA, to be up-regulated in RA FLS in response to LPS, but their repression did not restore mature TNF-α expression in FLS. We showed previously that miR-346, which is upregulated in LPS-activated FLS, inhibited Btk expression that stabilized TNF-α mRNA. Blocking miR-346 reestablished TNF-α expression in activated FLS. Interestingly, transfection of miR-346 in LPS-activated THP-1 cells inhibited TNF-α secretion. We also demonstrated that TTP, a RNA binding protein which inhibited TNF-α synthesis, is overexpressed in activated FLS and that inhibition of miR-346 decreases its expression. Conversely, transfection of miR-346 in LPS-activated THP-1 cells increased TTP mRNA expression and inhibited TNF-α release. These results indicate that miR-346 controls TNF-α synthesis by regulating TTP expression.
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