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MicroRNA regulation of adult neurogenesis in the SVZ stem cell niche.

机译:SVZ干细胞生态位中成年神经发生的MicroRNA调控。

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摘要

The subventricular zone (SVZ) is the largest neurogenic niche in the adult mammalian brain. Stem cells in this region are SVZ astrocytes, glial cells classically associated with support functions. A key question is how stem cells with glial characteristics transition along the lineage into neurons. Here I show that microRNAs (miRNAs) are important regulators whose key role in stem cell biology is just emerging. One of these miRNAs, the brain-enriched miR-124, is an important regulator of the timing of SVZ stem cell lineage progression. Knockdown of endogenous miR-124 maintains SVZ stem cells as dividing precursors, whereas ectopic expression leads to precocious neuron formation. Furthermore, miR-124 expression is required during SVZ neuronal regeneration. I identify the SRY-box transcription factor Sox9 and the DED-domain protein PEA-15 to be physiological targets of miR-124 in the adult mouse SVZ. Sox9 mRNA, but not protein, is present in SVZ neuroblasts. Blocking endogenous miR-124 leads to ectopic Sox9 protein expression in neuroblasts. Sox9 overexpression abolished neuronal differentiation whereas Sox9 knockdown led to increased neurogenesis and decreased glial formation. Thus, the dynamic interplay between miRNAs and their targets, demonstrated by miR-124 and Sox9 here in this dissertation, is important for progression along the SVZ stem cell lineage into neurons.
机译:室下区(SVZ)是成年哺乳动物脑中最大的神经源利基。该区域的干细胞是SVZ星形胶质细胞,通常与支持功能相关的神经胶质细胞。一个关键问题是具有神经胶质特征的干细胞如何沿谱系转变为神经元。在这里,我证明了microRNA(miRNA)是重要的调节子,它们在干细胞生物学中的关键作用才刚刚出现。这些miRNA之一是富含大脑的miR-124,它是SVZ干细胞谱系进展时间的重要调节剂。内源性miR-124的敲低将SVZ干细胞维持为分裂的前体,而异位表达导致早熟的神经元形成。此外,在SVZ神经元再生过程中需要miR-124表达。我确定SRY框转录因子Sox9和DED域蛋白PEA-15是成年小鼠SVZ中miR-124的生理靶标。 SVZ成神经细胞中存在Sox9 mRNA,但不存在蛋白质。阻断内源性miR-124导致神经母细胞中异位Sox9蛋白表达。 Sox9的过表达消除了神经元分化,而Sox9的敲低导致神经发生增加和神经胶质形成减少。因此,本文中的miR-124和Sox9证实了miRNA及其靶标之间的动态相互作用,对于沿着SVZ干细胞谱系发展为神经元至关重要。

著录项

  • 作者

    Cheng, Li-Chun.;

  • 作者单位

    Columbia University.;

  • 授予单位 Columbia University.;
  • 学科 Biology Neuroscience.;Biology Cell.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 145 p.
  • 总页数 145
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:25

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