Nuclear Envelope Transmembrane Proteins in Myotonic Dystrophy Type 1.

Nuclear Envelope Transmembrane Proteins in Myotonic Dystrophy Type 1.
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DOI:
10.3389/fphys.2018.01532
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发表时间:
2018
影响因子:
4
通讯作者:
Meinke P
Meinke P
中科院分区:
医学2区
文献类型:
--
作者:
Hintze S;Knaier L;Limmer S;Schoser B;Meinke P

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强直性肌营养不良1型(DM1)是一种以肌强直和肌营养不良为主的多系统疾病,由DMPK基因CTG重复扩增引起。这些重复扩增被转录,由此产生的mRNA积累了参与剪接的RNA结合蛋白,导致了普遍的剪接缺陷。我们观察了DM1原代成肌细胞核膜(NE)的变化。这些包括NE的内陷以及核板成分的改变。具体地说,我们研究了DM1原代成肌细胞中的NE跨膜蛋白(Net),染色以确定它们的分布是否与对照组相比发生了变化,以及这是否可能导致这些结构缺陷。我们还测试了这些Nets在肌肉中的表达,以及在体外分化为肌管的DM1原代成肌细胞中定位的变化。我们发现测试的Net的定位没有变化,但随着DMPK-重复长度的增加,大多数Net的表达倾向于减少。尽管如此,DM1患者的表达范围在对照组的表达范围内。此外,我们还发现DM1原代成肌细胞中可能的Nesprin 1巨型异构体下调,这可能是导致NE内陷增加的原因之一。因此,Nesprin 1可能是进一步研究DM1疾病病理的一个有趣的靶点。
Myotonic dystrophy type 1 (DM1) is a multisystemic disorder with predominant myotonia and muscular dystrophy which is caused by CTG-repeat expansions in the DMPK gene. These repeat expansions are transcribed and the resulting mRNA accumulates RNA-binding proteins involved in splicing, resulting in a general splicing defect. We observed nuclear envelope (NE) alterations in DM1 primary myoblasts. These included invaginations of the NE as well as an altered composition of the nuclear lamina. Specifically, we investigated NE transmembrane proteins (NETs) in DM1 primary myoblasts, staining to determine if their distribution was altered compared to controls and if this could contribute to these structural defects. We also tested the expression of these NETs in muscle and how localization changes in the DM1 primary myoblasts undergoing differentiation in vitro to myotubes. We found no changes in the localization of the tested NETs, but most tended to exhibit reduced expression with increasing DMPK-repeat length. Nonetheless, the DM1 patient expression range was within the expression range of the controls. Additionally, we found a down-regulation of the possible nesprin 1 giant isoform in DM1 primary myoblasts which could contribute to the increased NE invaginations. Thus, nesprin 1 may be an interesting target for further investigation in DM1 disease pathology.
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