在体内表征一个短的podocyte表达的podoccin异型
Linus Butt1,2,3, David Unnersjö-Jess1,2,4, Dervla Reilly1
1Department II of Internal Medicine, University Hospital Cologne CECAD building Joseph-Stelzmann-Str. 62, Cologne, 50931, Germany.
BMC nephrology
|December 20, 2023
概括
在人类中新发现的一种短波多辛异型是不功能性的,不能替代全长蛋白质,导致在没有正规形式的小鼠中严重的病.
科学领域:
- 腎臟病學 (nephrology) 是一種醫學專業.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 类固醇耐药性性综合征 (SRNS) 通常是由NPHS2基因的突变引起的,这种基因编码着podocin.
- 一种较短的podocin异型,与正规形式不同,存在于人体脏中.
- 这种较短的异构体的生理作用以及其对正规形式的补偿潜力是未知的.
研究的目的:
- 为了研究较短的多多辛异型的功能能力.
- 为了确定较短的异型是否可以替代功能中的正规波多辛.
- 阐明降低多多水平对 podocyte 结构和功能的影响.
主要方法:
- 通过CRISPR/Cas9基因组编辑,创建一个表达较短的多多异型 (podocinΔexon5) 的小鼠模型.
- 同性合和异性合的PodocinΔexon5小鼠的表型特征.
- 有针对性的质谱和qPCR测量蛋白质和mRNA水平.
- 用STED显微镜可视化细胞脚过程形态和细胞局部化.
主要成果:
- 双胞胎的 podocinΔexon5小鼠表现出严重的albuminuria,并在出生后24小时内死亡.
- 质谱学显示,尽管mRNA水平正常,但podocinΔexon5的蛋白质水平显著降低.
- 通过STED显微镜检测出裂隔膜缺少波多辛,以及严重的波多细胞脚过程异常.
- 异合的小鼠在表型上是正常的,但呈现出降低的皮多辛和尼弗林蛋白水平.
结论:
- 人类短波多辛异型的小鼠同类是非功能性的,不能稳定波多细胞裂膜复合体.
- 在裂膜处降低的波多辛水平严重损害了波多细胞的功能和形态.
- 这种损伤与尼林蛋白的丰富性降低有关,这突显了皮多辛在维持脏过屏障完整性方面的重要性.
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