在HSP40家族的陪伴者异形DNAJB6b阻止神经元细胞从tau聚合
Ya-Lan Chang1, Chan-Chih Yang1, Yun-Yu Huang1
1Department of Microbiology, College of Medicine, National Taiwan University, No. 1, Section 1, Jen-Ai Road, Taipei, 10051, Taiwan.
BMC biology
|December 19, 2023
概括
DNAJB6b蛋白通过与tau的相互作用来防止阿尔茨海默病 (AD) 中的tau聚合. 降低的DNAJB6b水平与增加的tau病理相关,这表明它对AD的治疗潜力.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 蛋白质折叠 蛋白质的折叠
背景情况:
- 阿尔茨海默氏症 (AD) 是一种神经退行性疾病,其特征是认知能力下降以及团和粉样斑块的积累.
- 蛋白质的错误折叠,特别是陶蛋白,与阿尔茨海默病的发病有关.
- 含有J域的蛋白质 (JDPs) 是指导HSP70伴侣功能的辅助蛋白,但它们在向HSP70系统传递tau方面的具体作用尚不清楚.
研究的目的:
- 调查JDPs在预防神经元细胞中tau聚合中的作用.
- 确定参与HSP70介导的的清除的特定联合开发计划.
- 阐明JDP与tau相互作用的机制.
主要方法:
- 在SH-SY5Y神经母细胞瘤细胞中使用过器延迟试验对JDP进行查.
- 在DNAJB6淘汰和DNAJB6b过度表达时对tau聚合的分析.
- 双分子光补充试验以确认DNAJB6b-依赖的清除.
- 同免疫沉积和近距离结合试验用于检测蛋白质与蛋白质相互作用.
- 在tau病理的小鼠模型中进行免疫组织化学分析.
主要成果:
- DNAJB6的淘汰增加了tau的聚合,而DNAJB6b的过度表达减少了它.
- DNAJB6b与tau直接相互作用,其J域对于防止tau聚合至关重要.
- 在小鼠模型中,以年龄依赖的方式观察到DNAJB6表达的减少和tau聚合的增加.
结论:
- DNAJB6b在神经细胞中的HSP70折叠系统中作为tau的直接传感器.
- 对DNAJB6b的下调会导致不溶性的增加,而其过度表达会减少的聚合.
- DNAJB6b对病理有保护作用,这表明它有可能成为阿尔茨海默病的治疗点.
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