Knockdown of Rab9 Recovers Defective Morphological Differentiation Induced by Chemical ER Stress Inducer or PMD-Associated PLP1 Mutant Protein in FBD-102b Cells.

IF 2.7 Q2 PATHOLOGY
Nana Fukushima, Yuki Miyamoto, Junji Yamauchi
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引用次数: 0

Abstract

Small GTP-binding proteins of the Rab family regulate intracellular vesicle trafficking across many aspects of the transport system. Among these, Rab9 is recognized for its role in controlling the transport system not only around the trans-Golgi network but also around the late endosome. However, the specific functions across different cell types and tissues remain unclear. Here, for the first time, we report that Rab9 negatively regulates morphological changes in the FBD-102b cell line, an oligodendroglial precursor cell line undergoing morphological differentiation. The knockdown of Rab9 led to an increase in cell shape alterations characterized by widespread membrane extensions. These changes were accompanied by increased expression levels of oligodendroglial cell differentiation and myelination marker proteins. Notably, the knockdown of Rab9 was capable of recovering defective cell morphological changes induced by tunicamycin, an inducer of endoplasmic reticulum (ER) stress, which is one of the major causes of oligodendroglial cell diseases such as Pelizaeus-Merzbacher disease (PMD, currently known as hypomyelinating leukodystrophy type 1 [HLD1]). In addition, Rab9 knockdown recovered levels of ER stress marker proteins and differentiation markers. Similar results were obtained in the cases of dithiothreitol (DTT), another chemical ER stress inducer, as well as HLD1-associated proteolipid protein 1 (PLP1) mutant protein. These results indicate a unique role for Rab9 in oligodendroglial cell morphological changes, suggesting its potential as a therapeutic target for mitigating diseases such as HLD1 at the molecular and cellular levels.

敲除 Rab9 可恢复 FBD-102b 细胞中由化学性 ER 压力诱导剂或与 PMD 相关的 PLP1 突变蛋白诱导的缺陷形态分化。
Rab 家族的小 GTP 结合蛋白在运输系统的许多方面调节细胞内囊泡的运输。其中,Rab9 因其不仅控制跨高尔基体网络周围的运输系统,还控制晚期内质体周围的运输系统而得到认可。然而,不同细胞类型和组织的具体功能仍不清楚。在这里,我们首次报道了 Rab9 负向调控正在进行形态分化的少突胶质细胞前体细胞系 FBD-102b 的形态变化。Rab9被敲除后,以广泛的膜延伸为特征的细胞形态改变增加。伴随这些变化的是少突胶质细胞分化和髓鞘化标志蛋白表达水平的增加。值得注意的是,Rab9的敲除能够恢复由内质网(ER)应激诱导剂妥卡霉素(tunicamycin)诱导的细胞形态学缺陷变化,而ER应激是导致少突胶质细胞疾病(如佩里泽斯-默茨巴赫病(PMD,目前称为髓鞘功能减退性白质营养不良症1型[HLD1])的主要原因之一。此外,Rab9基因敲除还能恢复ER应激标志蛋白和分化标志物的水平。在使用另一种化学ER应激诱导剂二硫苏糖醇(DTT)以及HLD1相关蛋白脂质蛋白1(PLP1)突变体蛋白的情况下,也得到了类似的结果。这些结果表明了 Rab9 在少突胶质细胞形态变化中的独特作用,表明它有可能成为在分子和细胞水平上缓解 HLD1 等疾病的治疗靶点。
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来源期刊
Pathophysiology
Pathophysiology Medicine-Pathology and Forensic Medicine
CiteScore
3.10
自引率
0.00%
发文量
48
期刊介绍: Pathophysiology is an international journal which publishes papers in English which address the etiology, development, and elimination of pathological processes. Contributions on the basic mechanisms underlying these processes, model systems and interdisciplinary approaches are strongly encouraged.
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