Reelin-dependent ApoER2 downregulation uncouples newborn neurons from progenitor cells.

Reelin-dependent ApoER2 downregulation uncouples newborn neurons from progenitor cells.
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DOI:
10.1242/bio.20122816
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发表时间:
2012-12-15
期刊:
影响因子:
2.4
通讯作者:
Luque JM
Luque JM
中科院分区:
生物学4区
文献类型:
--
作者:
Pérez-Martínez FJ;Luque-Río A;Sakakibara A;Hattori M;Miyata T;Luque JM

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众所周知,Reelin及其受体机制是新皮层投射神经元迁移和定位所必需的。最近,reelin已被证明是必要的和足够的,以确定新皮层神经发生的速度。其看似不同的增殖和增殖后功能的分子联系仍然未知。在这里,我们揭示了丰富的表达功能reelin受体,主要是载脂蛋白E受体2(ApoER 2),在放射状胶质细胞基底进程和中间祖细胞在中/晚期皮质发育。在体内,ApoER 2过表达抑制神经元迁移。相反,通过ApoER 2敲低或在神经祖细胞中转基因表达reelin,排除reelin缺陷皮质中ApoER 2的过量水平,改善神经元迁移和定位。我们的研究为新皮层神经元从其出生部位的高度协调清除提供了基础,表明依赖于reelin的ApoER 2下调机制使新生神经元与祖细胞分离,从而使神经元能够迁移。
Reelin and its receptor machinery are well known to be required for the migration and positioning of neocortical projection neurons. More recently, reelin has been shown both necessary and sufficient to determine the rate of neocortical neurogenesis. The molecular links underlying its seemingly distinct proliferative and post-proliferative functions remain unknown. Here we reveal an enriched expression of functional reelin receptors, largely of Apolipoprotein E Receptor 2 (ApoER2), in radial glia basal processes and intermediate progenitor cells during mid/late cortical development. In vivo, ApoER2 overexpression inhibits neuronal migration. In contrast, precluding excessive levels of ApoER2 in reelin-deficient cortices, by either ApoER2 knock-down or the transgenic expression of reelin in neural progenitor cells, improves neuronal migration and positioning. Our study provides groundwork for the highly orchestrated clearance of neocortical neurons from their birth site, suggesting that a reelin-dependent ApoER2 downregulation mechanism uncouples newborn neurons from progenitor cells, thereby enabling neurons to migrate.
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