JIP4 缺乏导致由受损的囊流量引起的溶酶体储存疾病
Layla M Nassar1,2,3, Xiaojian Shi4,5,6, Agnes Roczniak-Ferguson1,2,3
1Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06510, USA.
bioRxiv : the preprint server for biology
|July 15, 2025
概括
JIP4蛋白通过调节囊素 (CTNS) 丰富度来控制 lysosomal 囊素水平. 失去JIP4会导致囊的积累,模仿 lysosomal储存疾病的囊病.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 溶解体对于细胞废物分解和营养物质循环利用至关重要.
- 囊是一种关键的营养素,通过囊素 (CTNS) 载体由溶酶体循环利用.
- lysosomal 功能的失调是各种储存疾病的基础.
研究的目的:
- 阐明一种调节 lysosomal cystine 储存的新型机制.
- 调查JIP4在控制囊素 (CTNS) 蛋白水平中的作用.
- 了解JIP4介导调节在溶酶体储存障碍中的影响.
主要方法:
- 研究了JIP4与囊素 (CTNS) 和TMEM55B的相互作用.
- 利用基于细胞的测试来评估CTNS无处不在和蛋白质稳定性.
- 分析了JIP4淘汰赛小鼠模型,以研究附近管中的体内表型.
主要成果:
- 鉴定出JIP4是溶酶体内囊储存的调节者.
- JIP4抑制了依赖TMEM55B的无处不在,从而稳定了CTNS蛋白.
- 丢失JIP4导致CTNS水平降低,导致溶酶体囊积累和储存缺陷.
- 在JIP4缺乏的细胞和小鼠中的表型重复了CTNS缺乏的表型.
结论:
- 通过控制CTNS丰度,JIP4在维持 lysosomal cystine 稳态中发挥着至关重要的作用.
- 已识别的JIP4-CTNS调节途径为囊病的发病过程提供了洞察力.
- JIP4突变可能会导致溶酶体储存疾病,突出显示JIP4是潜在的治疗点.
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