Lamin B1 levels modulate differentiation into neurons during embryonic corticogenesis.

Lamin B1 levels modulate differentiation into neurons during embryonic corticogenesis.
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DOI:
10.1038/s41598-017-05078-6
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发表时间:
2017-07-07
期刊:
影响因子:
4.6
通讯作者:
Gasparini L
Gasparini L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Mahajani S;Giacomini C;Marinaro F;De Pietri Tonelli D;Contestabile A;Gasparini L

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核纤层蛋白B1是核纤层的关键成分,在脑发育中起着重要作用。小鼠内源性核纤层蛋白B1(Lmnb 1)的消融强烈损害胚胎脑发育和皮质生成。然而,这些神经发育影响的机制尚不清楚。在这里,我们报告,核纤层蛋白B1水平调节小鼠神经干细胞(NSCs)分化为神经元和星形胶质细胞样细胞。在体外,内源性Lmnb 1耗竭有利于神经干细胞分化成胶质纤维酸性蛋白(GFAP)免疫反应阳性细胞的神经元,而人类核纤层蛋白B1(LMNB 1)的过度表达增加神经元的比例。在Lmnb 1-null胚胎,神经发生减少,而在体内Lmnb 1沉默在小鼠胚胎脑中的子宫内电穿孔的一个特定的Lmnb 1 shRNA的结果在异常的皮质定位的神经元和增加的表达星形胶质细胞标记GFAP在皮质的7天大的幼崽。总之,这些结果表明,细调水平的核纤层蛋白B1需要NSC分化成神经元,星形胶质细胞标记物GFAP和皮质的正确表达。
Lamin B1, a key component of the nuclear lamina, plays an important role in brain development. Ablation of endogenous Lamin B1 (Lmnb1) in the mouse strongly impairs embryonic brain development and corticogenesis. However, the mechanisms underlying these neurodevelopmental effects are unknown. Here, we report that Lamin B1 levels modulate the differentiation of murine neural stem cells (NSCs) into neurons and astroglial-like cells. In vitro, endogenous Lmnb1 depletion favors NSC differentiation into glial fibrillar acidic protein (GFAP)-immunoreactive cells over neurons, while overexpression of human Lamin B1 (LMNB1) increases the proportion of neurons. In Lmnb1-null embryos, neurogenesis is reduced, while in vivo Lmnb1 silencing in mouse embryonic brain by in utero electroporation of a specific Lmnb1 sh-RNA results in aberrant cortical positioning of neurons and increased expression of the astrocytic marker GFAP in the cortex of 7-day old pups. Together, these results indicate that finely tuned levels of Lamin B1 are required for NSC differentiation into neurons, proper expression of the astrocytic marker GFAP and corticogenesis.
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