MicroRNA cluster miR-17-92 regulates neural stem cell expansion and transition to intermediate progenitors in the developing mouse neocortex.

MicroRNA cluster miR-17-92 regulates neural stem cell expansion and transition to intermediate progenitors in the developing mouse neocortex.
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DOI:
10.1016/j.celrep.2013.03.037
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发表时间:
2013-05-30
期刊:
影响因子:
8.8
通讯作者:
Sun T
Sun T
中科院分区:
生物学1区
文献类型:
--
作者:
Bian S;Hong J;Li Q;Schebelle L;Pollock A;Knauss JL;Garg V;Sun T

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在胚胎新皮质发育过程中,神经干细胞(NSCs)的严格调控性扩增以及它们向中间祖细胞(IPs)的转变对于正常皮质的形成和功能至关重要。调控神经干细胞扩增和转变的分子机制仍不清楚。在此,我们证明微小RNA(miRNA)miR - 17 - 92簇通过抑制Pten和Tbr2蛋白,对于维持皮质放射状胶质细胞(RGCs)和中间祖细胞的适当数量是必需的。在发育中的新皮质中特异性敲除miR - 17 - 92及其旁系同源物会限制神经干细胞增殖,抑制放射状胶质细胞扩增,并促进放射状胶质细胞向中间祖细胞的转变。此外,Pten和Tbr2保护剂在体内特异性阻断内源性miR - 17 - 92的沉默活性,并控制放射状胶质细胞和中间祖细胞的适当数量。我们的研究结果表明,微小RNA在促进神经干细胞增殖以及调节发育中的新皮质产生不同神经祖细胞的细胞命运决定方面具有关键作用。
During development of the embryonic neocortex, tightly regulated expansion of neural stem cells (NSCs) and their transition to intermediate progenitors (IPs) are critical for normal cortical formation and function. Molecular mechanisms that regulate NSC expansion and transition remain unclear. Here, we demonstrate that the microRNA (miRNA) miR-17-92 cluster is required for maintaining proper populations of cortical radial glial cells (RGCs) and IPs through repression of Pten and Tbr2 protein. Knockout of miR-17-92 and its paralogs specifically in the developing neocortex restricts NSC proliferation, suppresses RGC expansion, and promotes transition of RGCs to IPs. Moreover, Pten and Tbr2 protectors specifically block silencing activities of endogenous miR-17-92 and control proper numbers of RGCs and IPs in vivo. Our results demonstrate a critical role for miRNAs in promoting NSC proliferation and modulating the cell-fate decision of generating distinct neural progenitors in the developing neocortex.
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