Regulation of synaptic structure and function by FMRP-associated microRNAs miR-125b and miR-132.

Regulation of synaptic structure and function by FMRP-associated microRNAs miR-125b and miR-132.
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DOI:
10.1016/j.neuron.2010.01.005
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发表时间:
2010-02-11
期刊:
影响因子:
16.2
通讯作者:
Sheng, Morgan
Sheng, Morgan
中科院分区:
医学1区
文献类型:
--
作者:
Edbauer, Dieter;Neilson, Joel R.;Foster, Kelly A.;Wang, Chi-Fong;Seeburg, Daniel P.;Batterton, Matthew N.;Tada, Tomoko;Dolan, Bridget M.;Sharp, Phillip A.;Sheng, Morgan

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微小RNA(miRNAs)是抑制特定信使RNA(mRNAs)翻译的非编码RNA。miRNA机制与脆性X智力低下蛋白(FMRP)相互作用,FMRP起到翻译抑制因子的作用。我们发现,在小鼠大脑中,miR - 125b和miR - 132以及其他几种miRNAs与FMRP相关联。miR - 125b和miR - 132对海马神经元的树突棘形态和突触生理学具有很大程度上相反的影响。FMRP的敲低改善了miRNA过表达对树突棘形态的影响。我们确定N - 甲基 - D - 天冬氨酸(NMDA)受体亚基NR2A是miR - 125b的新靶点,并表明NR2A信使RNA在大脑中与FMRP特异性相关。在海马神经元中,NR2A的表达通过其3’非翻译区(3’UTR)受到FMRP、miR - 125b和AGO1的负调控。FMRP对NR2A 3’UTR的调控部分取决于miR - 125b。由于NMDA受体亚基组成深刻影响突触可塑性,这些观察结果对脆性X综合征的病理生理学具有启示意义,在该综合征中可塑性发生了改变。
MicroRNAs (miRNAs) are non-coding RNAs that suppress translation of specific mRNAs. The miRNA machinery interacts with Fragile X Mental Retardation Protein (FMRP), which functions as translational repressor. We show that miR-125b and miR-132, as well as several other miRNAs, are associated with FMRP in mouse brain. miR-125b and miR-132 had largely opposing effects on dendritic spine morphology and synaptic physiology in hippocampal neurons. FMRP knockdown ameliorates the effect of miRNA overexpression on spine morphology. We identified NMDA receptor subunit NR2A as novel target of miR-125b and show that NR2A mRNA is specifically associated with FMRP in brain. In hippocampal neurons, NR2A expression is negatively regulated through its 3’UTR by FMRP, miR-125b and Argonaute 1. Regulation of NR2A 3’UTR by FMRP depends in part on miR-125b. Because NMDA receptor subunit composition profoundly affects synaptic plasticity, these observations have implications for the pathophysiology of Fragile X Syndrome, in which plasticity is altered.
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