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首页> 外文期刊>Development >Developmental potential of defined neural progenitors derived from mouse embryonic stem cells.
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Developmental potential of defined neural progenitors derived from mouse embryonic stem cells.

机译:源自小鼠胚胎干细胞的特定神经祖细胞的发育潜力。

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The developmental potential of a uniform population of neural progenitors was tested by implanting them into chick embryos. These cells were generated from retinoic acid-treated mouse embryonic stem (ES) cells, and were used to replace a segment of the neural tube. At the time of implantation, the progenitors expressed markers defining them as Pax6-positive radial glial (RG) cells, which have recently been shown to generate most pyramidal neurons in the developing cerebral cortex. Six days after implantation, the progenitors generated large numbers of neurons in the spinal cord, and differentiated into interneurons and motoneurons at appropriate locations. They also colonized the host dorsal root ganglia (DRG) and differentiated into neurons, but, unlike stem cell-derived motoneurons, they failed to elongate axons out of the DRG. In addition, they neither expressed the DRG marker Brn3a nor the Trk neurotrophin receptors. Control experiments with untreated ES cells indicated that when colonizing the DRG, these cells did elongate axons and expressed Brn3a, as well as Trk receptors. Our results thus indicate that ES cell-derived progenitors with RG characteristics generate neurons in the spinal cord and the DRG. They are able to respond appropriately to local cues in the spinal cord, but not in the DRG, indicating that they are restricted in their developmental potential.
机译:通过将神经祖细胞植入鸡胚来测试其均匀的发育潜力。这些细胞由视黄酸处理过的小鼠胚胎干(ES)细胞产生,并用于替换神经管的一部分。在植入时,祖细胞表达的标志物将它们定义为Pax6阳性radial状神经胶质(RG)细胞,最近已显示它们在发育中的大脑皮层中产生大多数锥体神经元。植入后六天,祖细胞在脊髓中产生大量神经元,并在适当位置分化为中间神经元和运动神经元。他们还定殖了宿主背根神经节(DRG)并分化为神经元,但与干细胞衍生的运动神经元不同,它们未能将轴突延伸出DRG。另外,他们既不表达DRG标志物Brn3a也不表达Trk神经营养蛋白受体。用未经处理的ES细胞进行的对照实验表明,在DRG上定植时,这些细胞确实会延长轴突并表达Brn3a以及Trk受体。因此,我们的结果表明,具有RG特征的ES细胞来源的祖细胞在脊髓和DRG中产生神经元。它们能够对脊髓中的局部提示做出适当反应,而对DRG则没有,这表明它们的发育潜力受到限制。

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