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首页> 外文期刊>Neuron >Fragile X mental retardation protein is required for synapse elimination by the activity-dependent transcription factor MEF2.
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Fragile X mental retardation protein is required for synapse elimination by the activity-dependent transcription factor MEF2.

机译:活性依赖的转录因子MEF2消除突触需要脆弱的X智力障碍蛋白。

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摘要

Fragile X syndrome (FXS), the most common genetic form of mental retardation and autism, is caused by loss-of-function mutations in an RNA-binding protein, Fragile X Mental Retardation Protein (FMRP). Neurons from patients and the mouse Fmr1 knockout (KO) model are characterized by an excess of dendritic spines, suggesting a deficit in excitatory synapse elimination. In response to neuronal activity, myocyte enhancer factor 2 (MEF2) transcription factors induce robust synapse elimination. Here, we demonstrate that MEF2 activation fails to eliminate functional or structural excitatory synapses in hippocampal neurons from Fmr1 KO mice. Similarly, inhibition of endogenous MEF2 increases synapse number in wild-type but not Fmr1 KO neurons. MEF2-dependent synapse elimination is rescued in Fmr1 KO neurons by acute postsynaptic expression of wild-type but not RNA-binding mutants of FMRP. Our results reveal that active MEF2 and FMRP function together in an acute, cell-autonomous mechanism to eliminate excitatory synapses.
机译:脆性X综合征(FXS)是智力低下和自闭症最常见的遗传形式,是由RNA结合蛋白脆性X智力低下蛋白(FMRP)中的功能丧失突变引起的。来自患者和小鼠Fmr1基因敲除(KO)模型的神经元的特征是过量的树突棘,表明兴奋性突触消除缺乏。响应神经元活动,心肌细胞增强因子2(MEF2)转录因子诱导强大的突触消除。在这里,我们证明了MEF2激活不能消除Fmr1 KO小鼠海马神经元的功能性或结构性兴奋性突触。同样,抑制内源性MEF2可增加野生型的Fnr1 KO神经元的突触数量。野生型的急性突触后表达,但不是FMRP的RNA结合突变体,可以通过Fmr1 KO神经元抢救MEF2依赖的突触。我们的研究结果表明,主动的MEF2和FMRP在急性,细胞自主机制中共同发挥功能,消除兴奋性突触。

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