Nature:针对II型脊髓小脑性共济失调的基因疗法

2017-04-13 MedSci MedSci原创

II型脊髓小脑性共济失调(spinocerebellar ataxia type 2)是一种基因疾病,因为转录ATXN2蛋白的DNA序列中的CAG片段异常重复,导致了ATXN2蛋白的N端出现了异常的多聚谷氨酰胺片段。最初II型脊髓小脑性共济失调仅被描述为小脑退化,现在知道它还包括小脑周围的其他细胞,并且表现为肌萎缩性侧索硬化症(amyotrophic lateral sclerosis)帕金森症(

II型脊髓小脑性共济失调(spinocerebellar ataxia type 2)是一种基因疾病,因为转录ATXN2蛋白的DNA序列中的CAG片段异常重复,导致了ATXN2蛋白的N端出现了异常的多聚谷氨酰胺片段。最初II型脊髓小脑性共济失调仅被描述为小脑退化,现在知道它还包括小脑周围的其他细胞,并且表现为肌萎缩性侧索硬化症(amyotrophic lateral sclerosis)帕金森症(Parkinson disease)。开发针对II型脊髓小脑性共济失调的基因疗法对疾病的治疗非常重要。

在最新上线的Nature杂志中,来自美国犹他大学的Daniel R.Scoles及其同事报导了他们运用人工合成的核苷酸降低ATXN2蛋白的表达量,从而达到改善和治疗II型脊髓小脑性共济失调的目的。

研究组首先在体外细胞实验中筛选了152种人工合成的反链核苷酸(anti-sense oligonucleotide),然后发现其中有8种反链核苷酸能将ATXN2蛋白的表达量降低至少85%。在这之中,又有3种反链核苷酸能够持续抑制ATXN2蛋白的表达长达一周,并且不会显著的激活神经组织中的小胶质细胞(microglial cell)。

研究组接着在两种II型脊髓小脑性共济失调小鼠模型中测试了一种反链核苷酸的疗效。研究组将反链核苷酸直通过脑室注射。发现反链核苷酸能够进入小脑皮质的浦肯野细胞,并且降低ATXN2蛋白的表达量达10周之久。直射后,浦肯野细胞的电极激活频率和运动能力都达到了正常水平。

这项研究为治疗由于ATXN2基因缺陷所导致的II型脊髓小脑性共济失调提供了新的方向。

原始初始:
Daniel R. Scoles, Pratap Meera, Matthew D. Schneider et al. Antisense oligonucleotide therapy for spinocerebellar ataxia type 2. Nature (2017) doi:10.1038/nature22044

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    2020-08-31 ms7000001810749191

    需要救治

    0

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    2020-08-31 ms7000001810749191

    什么时候才能药物上市

    0

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    2018-03-07 liye789132251
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    2017-04-15 1e10c84am36(暂无匿称)

    文章很好,值得分享

    0

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    2017-04-15 jin321

    期待突破

    0

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