Recombinant Adeno-Associated Virus-Mediated microRNA Delivery into the Postnatal Mouse Brain Reveals a Role for miR-134 in Dendritogenesis in Vivo.

Recombinant Adeno-Associated Virus-Mediated microRNA Delivery into the Postnatal Mouse Brain Reveals a Role for miR-134 in Dendritogenesis in Vivo.
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DOI:
10.3389/neuro.04.016.2009
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发表时间:
2010
影响因子:
3.5
通讯作者:
Schratt G
Schratt G
中科院分区:
医学3区
文献类型:
--
作者:
Christensen M;Larsen LA;Kauppinen S;Schratt G

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最近的研究使用原代神经元培养物揭示了microRNA途径在神经元发育和形态调控中的重要作用。例如,miR-134通过调节树突中的局部mRNA翻译参与海马神经元中的树突发生和棘发育。microRNA在这些过程中的体内作用仍未得到研究,部分原因是缺乏能够将microRNA或microRNA抑制剂稳定体内递送到哺乳动物脑神经元中的工具。在这里,我们描述了一个基于载体的工具,通过使用重组腺相关病毒(rAAV)在体内稳定递送microRNA的构建和验证。rAAV介导的miR-134在出生后小鼠脑神经元中的过表达提供了miR-134在体内皮质层V锥体神经元的树突状分支中的负作用的证据,从而证实了先前用培养的神经元获得的发现。我们的系统为研究人员提供了一个独特的工具来研究任何候选microRNA在体内的作用,并且可以很容易地适应microRNA功能丧失的研究。因此,该平台将极大地促进microRNA在突触发育,可塑性和体内行为中的作用的研究。
Recent studies using primary neuronal cultures have revealed important roles of the microRNA pathway in the regulation of neuronal development and morphology. For example, miR-134 is involved in dendritogenesis and spine development in hippocampal neurons by regulating local mRNA translation in dendrites. The in vivo roles of microRNAs in these processes are still uninvestigated, partly due to the lack of tools enabling stable in vivo delivery of microRNAs or microRNA inhibitors into neurons of the mammalian brain. Here we describe the construction and validation of a vector-based tool for stable delivery of microRNAs in vivo by use of recombinant adeno-associated virus (rAAV). rAAV-mediated overexpression of miR-134 in neurons of the postnatal mouse brain provided evidence for a negative role of miR-134 in dendritic arborization of cortical layer V pyramidal neurons in vivo, thereby confirming previous findings obtained with cultured neurons. Our system provides researchers with a unique tool to study the role of any candidate microRNA in vivo and can easily be adapted to microRNA loss-of-function studies. This platform should therefore greatly facilitate investigations on the role of microRNAs in synapse development, plasticity and behavior in vivo.
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