Aggregates of small nuclear ribonucleic acids (snRNAs) in Alzheimer's disease.

Aggregates of small nuclear ribonucleic acids (snRNAs) in Alzheimer's disease.
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DOI:
10.1111/bpa.12133
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发表时间:
2014-07
期刊:
Brain pathology (Zurich, Switzerland)
影响因子:
--
通讯作者:
Lah JJ
Lah JJ
中科院分区:
其他
文献类型:
--
作者:
Hales CM;Dammer EB;Diner I;Yi H;Seyfried NT;Gearing M;Glass JD;Montine TJ;Levey AI;Lah JJ

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我们最近发现,核糖核酸(RNA)剪接体的蛋白质组分在阿尔茨海默病(AD)脑中形成细胞质聚集体,导致RNA剪接的广泛变化。然而,参与小核RNA(snRNA),剪接体复合物的关键组成部分,在AD的病理学仍然未知。使用死后人脑和脊髓的免疫组化染色,我们确定了在散发性和家族性AD病例中snRNA的胞质缠结状聚集体,但在老年对照组或其他神经退行性疾病中没有。使用与snRNA的2,2,7-三甲基鸟苷帽反应的抗体的免疫荧光和透射电子显微镜证实了snRNA与tau蛋白和成对螺旋丝(神经元缠结的主要成分)的定位。定量实时聚合酶链反应(PCR)显示,U1的snRNA积累在AD大脑的不溶性部分,而其他U snRNA不富集。结合我们以前的研究结果,这些发现表明,U1 snRNA和U1小核核糖核蛋白的聚集体代表了AD的一个新的病理标志。
We recently discovered that protein components of the ribonucleic acid (RNA) spliceosome form cytoplasmic aggregates in Alzheimer’s disease (AD) brain, resulting in widespread changes in RNA splicing. However, the involvement of small nuclear RNAs (snRNAs), also key components of the spliceosome complex, in the pathology of AD remains unknown. Using immunohistochemical staining of post-mortem human brain and spinal cord, we identified cytoplasmic tangle-shaped aggregates of snRNA in both sporadic and familial AD cases but not in aged controls or other neurodegenerative disorders. Immunofluorescence using antibodies reactive with the 2,2,7-trimethylguanosine cap of snRNAs and transmission electron microscopy demonstrated snRNA localization with tau and paired helical filaments, the main component of neurofibrillary tangles. Quantitative real-time polymerase chain reaction (PCR) showed U1 snRNA accumulation in the insoluble fraction of AD brains whereas other U snRNAs were not enriched. In combination with our previous results, these findings demonstrate that aggregates of U1 snRNA and U1 small nuclear ribonucleoproteins represent a new pathological hallmark of AD.
神经退行性疾病中的RNA结合蛋白:TDP-43及以后。
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