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首页> 外文期刊>Neuron >Control of CNS cell-fate decisions by SHP-2 and its dysregulation in Noonan syndrome.
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Control of CNS cell-fate decisions by SHP-2 and its dysregulation in Noonan syndrome.

机译:在Noonan综合征中SHP-2对中枢神经系统细胞命运决定的控制及其失调。

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摘要

Within the developing mammalian CNS, growth factors direct multipotent precursors to generate neurons versus glia, a process that if perturbed might lead to neural dysfunction. In this regard, genetic mutations resulting in constitutive activation of the protein tyrosine phosphatase SHP-2 cause Noonan Syndrome (NS), which is associated with learning disabilities and mental retardation. Here, we demonstrate that genetic knockdown of SHP-2 in cultured cortical precursors or in the embryonic cortex inhibited basal neurogenesis and caused enhanced and precocious astrocyte formation. Conversely, expression of an NS SHP-2 mutant promoted neurogenesis and inhibited astrogenesis. Neural cell-fate decisions were similarly perturbed in a mouse knockin model that phenocopies human NS. Thus, SHP-2 instructs precursors to make neurons and not astrocytes during the neurogenic period, and perturbations in the relative ratios of these two cell types upon constitutive SHP-2 activation may contribute to the cognitive impairments in NS patients.
机译:在发育中的哺乳动物中枢神经系统中,生长因子指导多能前体产生神经元,而不是神经胶质。如果受到干扰,该过程可能导致神经功能障碍。在这方面,导致蛋白质酪氨酸磷酸酶SHP-2组成型激活的遗传突变会导致Noonan综合征(NS),这与学习障碍和智力低下有关。在这里,我们证明了在培养的皮质前体或胚胎皮质中SHP-2的基因敲低抑制了基础神经发生,并导致增强的早熟星形胶质细胞形成。相反,NS SHP-2突变体的表达促进神经发生并抑制星形胶质细胞生成。神经细胞命运的决定在表型人NS的小鼠敲入模型中同样受到干扰。因此,SHP-2指示前体在神经发生期间产生神经元而不是星形胶质细胞,并且在组成型SHP-2激活后,这两种细胞类型的相对比率发生扰动可能会导致NS患者的认知障碍。

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