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首页> 外文期刊>The Journal of Clinical Investigation: The Official Journal of the American Society for Clinical Investigation >Shortened TDP43 isoforms upregulated by neurona hyperactivity drive TDP43 pathology in ALS
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Shortened TDP43 isoforms upregulated by neurona hyperactivity drive TDP43 pathology in ALS

机译:神经元多动上调的缩短 TDP43 亚型驱动 ALS 中 TDP43 病理学

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摘要

Cortical hyperexcitability and mislocalization of the RNA-binding protein TDP43 are highly conserved features in amyotrophic lateral sclerosis (ALS). Nevertheless, the relationship between these phenomena remains poorly defined. Here, we showed that hyperexcitability recapitulates TDP43 pathology by upregulating shortened TDP43 (sTDP43) splice isoforms. These truncated isoforms accumulated in the cytoplasm and formed insoluble inclusions that sequestered full-length TDP43 via preserved N-terminal interactions. Consistent with these findings, sTDP43 overexpression was toxic to mammalian neurons, suggesting neurodegeneration arising from complementary gain- and loss-of-function mechanisms. In humans and mice, sTDP43 transcripts were enriched in vulnerable motor neurons, and we observed a striking accumulation of sTDP43 within neurons and glia of ALS patients. Collectively, these studies uncover a pathogenic role for alternative TDP43 isoforms in ALS, and implicate sTDP43 as a key contributor to the susceptibility of motor neurons in this disorder.
机译:皮质过度兴奋性和 RNA 结合蛋白 TDP43 的错误定位是肌萎缩侧索硬化症 (ALS) 的高度保守特征。然而,这些现象之间的关系仍然没有得到明确的定义。在这里,我们发现过度兴奋性通过上调缩短的 TDP43 (sTDP43) 剪接亚型来概括 TDP43 病理学。这些截短的亚型在细胞质中积累并形成不溶性内含物,通过保留的 N 端相互作用隔离全长 TDP43。与这些发现一致,sTDP43过表达对哺乳动物神经元有毒,表明神经退行性变是由互补的功能获得和丧失机制引起的。在人类和小鼠中,sTDP43 转录本在脆弱的运动神经元中富集,我们观察到 sTDP43 在 ALS 患者的神经元和神经胶质细胞中显着积累。总的来说,这些研究揭示了替代 TDP43 亚型在 ALS 中的致病作用,并暗示 sTDP43 是这种疾病中运动神经元易感性的关键因素。

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