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首页> 外文期刊>Neuron >Nicotinamide Pathway-Dependent Sirt1 Activation Restores Calcium Homeostasis to Achieve Neuroprotection in Spinocerebellar Ataxia Type 7
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Nicotinamide Pathway-Dependent Sirt1 Activation Restores Calcium Homeostasis to Achieve Neuroprotection in Spinocerebellar Ataxia Type 7

机译:烟酰胺途径依赖性SIRT1活化恢复钙稳态,以实现纺丝大脑共济失调的神经保护型7型

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摘要

Sirtuin 1 (Sirt1) is a NAD(+)-dependent deacetylase capable of countering age-related neurodegeneration, but the basis of Sirt1 neuroprotection remains elusive. Spinocerebellar ataxia type 7 (SCA7) is an inherited CAG-polyglutamine repeat disorder. Transcriptome analysis of SCA7 mice revealed downregulation of calcium flux genes accompanied by abnormal calcium-dependent cerebellar membrane excitability. Transcription-factor binding-site analysis of downregulated genes yielded Sirt1 target sites, and we observed reduced Sirt1 activity in the SCA7 mouse cerebellum with NAD(+) depletion. SCA7 patients displayed increased poly(ADP-ribose) in cerebellar neurons, supporting poly(ADP-ribose) polymerase-1 upregulation. We crossed Sirt1-overexpressing mice with SCA7 mice and noted rescue of neurodegeneration and calcium flux defects. NAD(+) repletion via nicotinamide riboside ameliorated disease phenotypes in SCA7 mice and patient stem cell-derived neurons. Sirt1 thus achieves neuroprotection by promoting calcium regulation, and NAD(+) dysregulation underlies Sirt1 dysfunction in SCA7, indicating that cerebellar ataxias exhibit altered calcium homeostasis because of metabolic dysregulation, suggesting shared therapy targets.
机译:Sirtuin 1(SIRT1)是一种NAD(+) - 依赖于脱乙酰酶,能够反击与年龄相关的神经变性,但SIRT1神经保护的基础仍然难以捉摸。 Spinocerebellar Ataxia型7(SCA7)是一种遗传的CAG-聚谷氨酰胺重复障碍。 SCA7小鼠的转录组分析显示钙助熔剂的下调伴有异常钙依赖性小脑膜兴奋性。下调基因的转录因子结合 - 位点分析产生SIRT1靶位位点,并且我们观察到SCA7小鼠小脑中的SIRT1活性降低,NAD(+)耗尽。 SCA7患者在小脑神经元中显示多(ADP-核糖),支撑聚(ADP-核糖)聚合酶-1上调。我们用SCA7小鼠跨越SIRT1过度抑制小鼠,并注意到神经变性和钙助焊剂缺陷的救援。 NAD(+)通过烟酰胺族核苷的补充在SCA7小鼠和患者干细胞衍生神经元中的核苷酰胺核糖苷e改善疾病表型。因此,SIRT1通过促进钙调节来实现神经保护,NAD(+)失调在SCA7中裂解SIRT1功能障碍,表明由于代谢的失调,表明小脑Ataxias表现出改变的钙稳态,表明共享治疗目标。

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