lysosomal cystine出口调节mTORC1信号,以指导脏上皮细胞命运专业化
Marine Berquez1, Zhiyong Chen1, Beatrice Paola Festa1
1Institute of Physiology, University of Zurich, 8057, Zurich, Switzerland.
Nature communications
|July 14, 2023
概括
从溶酶体中缺陷的囊动员会通过激活mTORC1.1,破坏细胞分化. 在囊病模型中,mTORC1的治疗抑制会纠正这些细胞命运缺陷.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 脏生理学 脏生理学
背景情况:
- 细胞分化对器官功能至关重要,但控制细胞命运决定的信号通路尚未完全理解.
- 脏近道管 (PT) 细胞通常通过内细胞和溶酶体降解来处理蛋白质以产生囊.
- 囊素突变 (CTNS) 导致囊症,一种溶酶体储存障碍,导致囊素调动受损.
研究的目的:
- 研究囊动员在脏近壁管细胞分化和功能中的作用.
- 阐明缺陷的囊处理影响细胞命运的分子机制.
- 为了确定囊病和相关细胞平衡的疾病的潜在治疗点.
主要方法:
- 使用缺乏囊素 (CTNS) 的淘汰模式来研究受损囊素调动的影响.
- 研究了mTORC1信号通路的激活,以应对溶酶体内的囊储存.
- 在囊病的临床前模型中使用细胞透的L-cystine类似物和治疗性mTORC1抑制.
主要成果:
- 在CTNS缺陷细胞中,缺陷的囊动员导致异常生长和繁殖,破坏PT细胞功能.
- Lysosomal 囊积累激活了mTORC1通路,而不依赖于营养的可用性.
- 恢复CTNS功能或抑制mTORC1可以治疗性地挽救囊病模型中的 lysosomal 和分化缺陷.
结论:
- 囊作为一个关键的溶酶体营养信号,调节mTORC1活动和细胞代谢.
- 失调的囊稳定和随后的mTORC1激活有助于干扰囊病中的上皮细胞命运决定.
- 向囊-mTORC1轴代表了对囊病和相关代谢障碍的有前途的治疗策略.
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