拉格GTPases通过抑制TFEB独立于mTORC1来抑制囊性病
Flaviane de Fatima Silva1, Alexander R Boucher1, Huawei Li1
1Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, MA, 01605.
bioRxiv : the preprint server for biology
|August 6, 2025
概括
在细胞中删除Rag GTPases意外导致囊生长,挑战了mTORC1在囊性疾病 (RCD) 中的作用. TFEB,而不是mTORC1,驱动囊的形成,为ADPKD提供了新的治疗点.
科学领域:
- 细胞生物学 细胞生物学
- 腎臟病學 (nephrology) 是一種醫學專業.
- 分子医学是分子医学.
背景情况:
- 管状上皮细胞 (rTEC) 中异常mTORC1信号与ADPKD和TSC等囊性疾病 (RCD) 有关.
- mTORC1在RCD病变发生中的确切作用仍然不完全理解.
- 已知Rag GTPases可以将mTORC1招募到 lysosomes中进行激活.
研究的目的:
- 调查Rag GTPases和mTORC1在细胞形成中的精确作用.
- 确定驱动RCD中囊形成的关键分子通路.
- 评估RCD的潜在生物标志物.
主要方法:
- 在小鼠RTECs中Raga/B的遗传删除.
- 分析mTORC1活动,TFEB局部化和细胞形成.
- 在不同的RCD模型中比较分子特征.
主要成果:
- 在RTEC中Raga/B的删除诱导了细胞形成和功能衰竭,尽管有mTORC1抑制.
- TFEB被确定为Raga/B损失下游细胞生成的主要驱动因素.
- 发现Rag GTPases,而不是mTORC1,是TFEB的主要体内抑制剂.
- 在多个RCD模型中观察到核TFEB的增加,并且是ADPKD的一致生物标志物.
结论:
- 这项研究挑战了既定观点,即mTORC1过度激活对于细胞生成至关重要.
- 通过调节TFEB,Rag GTPases在抑制囊形成方面发挥着至关重要的作用.
- 核TFEB在ADPKD中可能比mTORC1活动更可靠的生物标志物.
- 这些发现对RCD治疗策略具有重大翻译意义.
关键词:
在 ADPKDD 中,拉格 GTPase 的使用.美国联邦税务法 (TFEB)这就是TSC的特点.在UCP1中,UCP1是UCP1.在 mTORC1 的情况下,mTORC1 是这就是脏细胞生成 (renal cystogenesis).更多相关视频
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