Mutant Ataxin-1 Inhibits Neural Progenitor Cell Proliferation in SCA1.

Mutant Ataxin-1 Inhibits Neural Progenitor Cell Proliferation in SCA1.
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DOI:
10.1007/s12311-016-0794-9
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发表时间:
2017-04
期刊:
Cerebellum (London, England)
影响因子:
--
通讯作者:
Opal P
Opal P
中科院分区:
其他
文献类型:
--
作者:
Cvetanovic M;Hu YS;Opal P

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脊髓小脑性共济失调1型(SCA 1)是一种显性遗传性神经退行性疾病,由共济失调蛋白1(ATXN1)中的多聚谷氨酰胺(Q)重复序列扩增引起。SCA1最初是一种小脑共济失调性疾病,发展到累及大脑皮层、海马和脑干。使用SCA1基因敲入小鼠,反映了人类疾病的复杂性,我们报告了成年神经元祖细胞(NPC)增殖能力的显着下降。值得注意的是,在周围神经元或神经胶质的变性环境之外,可以在体外观察到NPC增殖的减少,这表明在祖细胞内自主作用细胞的突变体ATXN1干扰了它们的增殖能力。我们的研究结果表明,受损的成人神经发生有助于疾病的进行性病理学,特别是在海马和大脑皮质等干细胞提供神经营养因子并参与成人神经发生的区域。这些发现不仅揭示了这种疾病的生物学,而且在未来任何基于干细胞的临床试验中都具有治疗意义。
Spinocerebellar ataxia type 1 (SCA1) is a dominantly inherited neurodegenerative disease caused by the expansion of a polyglutamine (Q) repeat tract in the protein ataxin-1 (ATXN1). Beginning as a cerebellar ataxic disorder, SCA1 progresses to involve the cerebral cortex, hippocampus, and brainstem. Using SCA1 knock-in mice that mirror the complexity of the human disease, we report a significant decrease in the capacity of adult neuronal progenitor cells (NPCs) to proliferate. Remarkably, a decrease in NPCs proliferation can be observed in vitro, outside the degenerative milieu of surrounding neurons or glia, demonstrating that mutant ATXN1 acting cell autonomously within progenitor cells interferes with their ability to proliferate. Our findings suggest that compromised adult neurogenesis contributes to the progressive pathology of the disease particularly in areas such as the hippocampus and cerebral cortex where stem cells provide neurotropic factors and participate in adult neurogenesis. These findings not only shed light on the biology of the disease but also have therapeutic implications in any future stem cell- based clinical trials.
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