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Inclusion body formation reduces levels of mutant huntingtin and the risk of neuronal death

机译:包涵体的形成减少了亨廷顿蛋白突变体的水平和神经元死亡的风险

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摘要

Huntington's disease is caused by an abnormal polyglutamine expansion within the protein huntingtin and is characterized by microscopic inclusion bodies of aggregated huntingtin and by the death of selected types of neuron. Whether inclusion bodies are pathogenic, incidental or a beneficial coping response is controversial. To resolve this issue we have developed an automated microscope that returns to precisely the same neuron after arbitrary intervals, even after cells have been removed from the microscope stage. Here we show, by survival analysis, that neurons die in a time-independent fashion but one that is dependent on mutant huntingtin dose and polyglutamine expansion; many neurons die without forming an inclusion body. Rather, the amount of diffuse intracellular huntingtin predicts whether and when inclusion body formation or death will occur. Surprisingly, inclusion body formation predicts improved survival and leads to decreased levels of mutant huntingtin elsewhere in a neuron. Thus, inclusion body formation can function as a coping response to toxic mutant huntingtin.
机译:亨廷顿舞蹈病是由蛋白质亨廷顿蛋白内的异常聚谷氨酰胺膨胀引起的,其特征是聚集的亨廷顿蛋白的微观包涵体和选定类型的神经元死亡。包涵体是致病的,偶然的还是有益的应对反应是有争议的。为了解决这个问题,我们开发了一种自动显微镜,即使在从显微镜载物台移出细胞后,该显微镜也可以在任意间隔后返回到完全相同的神经元。在这里,我们通过生存分析表明,神经元以一种与时间无关的方式死亡,但其中一种依赖于突变亨廷顿蛋白剂量和聚谷氨酰胺的扩展。许多神经元死亡而没有形成包涵体。相反,弥漫性细胞内亨廷顿蛋白的量可预测是否以及何时发生包涵体形成或死亡。出人意料的是,包涵体的形成可预测存活率的提高,并导致神经元其他部位的突变亨廷顿蛋白水平降低。因此,包涵体的形成可以作为对毒性突变亨廷顿蛋白的应对反应。

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