Cell Stem Cell:大脑干细胞仅具有有限的全能性,创造全新的脑细胞仍任重道远

2018-02-09 佚名 “细胞”微信号

过去人们都以为个体的脑细胞数量从出生开始就已经被确定了,直到USCF的Arturo Alvarez-Buylla博士等人证明鸟内以及小鼠的脑细胞中存在一定数量的干细胞,这部分细胞在个体一生的过程中会不断地产生新的神经元。

过去人们都以为个体的脑细胞数量从出生开始就已经被确定了,直到USCF的Arturo Alvarez-Buylla博士等人证明鸟内以及小鼠的脑细胞中存在一定数量的干细胞,这部分细胞在个体一生的过程中会不断地产生新的神经元。

此后,研究者们一直不断地探究如何能够通过刺激干细胞增殖能力提高大脑的功能。

许多研究者们都认为,体内大部分干细胞都能够无限地产生新的细胞,但最近由来自Alvarez-Buylla实验室做出的研究结果表明事实并非如此。

通过标记活体小鼠大脑中的干细胞,从而追踪其子代的命运,研究者们发现这些细胞并不是以"自我更新"的方式复制的。事实上,大部分干细胞分裂后都会转化为神经元,进而干细胞的数量会逐渐降低。

这一发现表明神经干细胞仅仅具有部分的更新能力,这一能力能够保证小鼠一生中拥有足够数量的神经元。但这对于寿命远远长于小鼠的人类来说是否有价值就不得而知了。

为了进一步观察这些细胞分裂的情况,作者们设计了一种技术能够记录这些细胞在实验室培养条件下的分裂事件,但同时能够保证其与周围组织连接的完整性。拍摄的影片数据证实了作者们此前利用标记技术得出的结果。

"我们通过成像的技术已经能够观察到这些细胞的复杂形态特征,但影像资料进一步表明其与周围环境的相互作用。它们能够从与外界的交流中得到分裂的信号,从而产生足够的神经元"。

相关结果发表在最近一期的《Cell Stem Cell》杂志上。

原始出处:

Obernier K,et al.Adult Neurogenesis Is Sustained by Symmetric Self-Renewal and Differentiation.Cell Stem Cell. 2018 Feb 1;22(2):221-234.e8.

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    2018-05-12 维他命
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