Sonic hedgehog signaling confers ventral telencephalic progenitors with distinct cortical interneuron fates.

Sonic hedgehog signaling confers ventral telencephalic progenitors with distinct cortical interneuron fates.
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DOI:
10.1016/j.neuron.2010.01.004
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发表时间:
2010-02-11
期刊:
影响因子:
16.2
通讯作者:
Anderson, Stewart A.
Anderson, Stewart A.
中科院分区:
医学1区
文献类型:
--
作者:
Xu, Qing;Guo, Lihua;Moore, Holly;Waclaw, Ronald R.;Campbell, Kenneth;Anderson, Stewart A.

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大脑皮层的中间神经元通过表达小白蛋白、生长抑素或钙视黄素的不同亚群的作用来调节皮质功能。前两个亚群的发生需要Nkx2.1的表达,而Nkx2.1在神经发生过程中由SHH信号维持。在本文中,我们报道了SHH信号的关键效应者Smo的内侧神经节隆起(MGE)中的镶嵌消除,揭示了MGE前体在神经发生期间保持了显著程度的可塑性。ShH信号阻止GSX2的上调和一些MGE前体细胞向尾神经节隆起样命运的转化,而GSX2的功能是促进这一命运。此外,较高水平的SHH信号促进了表达生长抑素的中间神经元的产生,而牺牲了表达小白蛋白的亚群。这些结果表明,大脑皮质功能的一个主要决定因素--皮质神经元间多样性,受到端脑腹侧SHH信号水平差异的严重影响。
Interneurons in the cerebral cortex regulate cortical functions through the actions of distinct subgroups that express parvalbumin, somatostatin or calretinin. The genesis of the first two subgroups requires the expression of NKX2.1, which is maintained by SHH signaling during neurogenesis. In this paper, we report that mosaic elimination in the medial ganglionic eminence (MGE) of Smo, a key effector of SHH signaling, reveals that MGE progenitors retain a remarkable degree of plasticity during the neurogenic period. SHH signaling prevents the upregulation of GSX2 and conversion of some MGE progenitors to a caudal ganglionic eminence-like fate, and GSX2 functions to promote that fate. In addition, a higher level of SHH signaling promotes the generation of the somatostatin-expressing interneuron at the expense of parvalbumin-expressing subgroup. These results indicate that cortical interneuron diversity, a major determinant of cortical function, is critically influenced by differential levels of SHH signaling within the ventral telencephalon.
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