干细胞mTOR信号传递在肠道营养适应过程中指导特定区域的细胞命运决定
Jaakko Mattila1, Arto Viitanen1,2, Gaia Fabris1,2
1Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki 00790, Finland.
Science advances
|February 9, 2024
概括
营养信号调节肠道干细胞 (ISC) 的大小和命运. mTOR复合体1 (mTORC1) 激活驱动ISC大小和肠芽细胞分化,影响肠道适应.
科学领域:
- 胃肠病学 胃肠病学
- 细胞生物学 细胞生物学
- 营养科学 营养科学
背景情况:
- 成人的肠道根据营养的可用性来调整其尺寸和细胞构成.
- 肠干细胞 (ISC) 的增殖和分化是这种适应的关键.
- 营养信号影响ISC命运和区域细胞组成的确切机制尚未完全理解.
研究的目的:
- 为了研究营养信号如何控制肠道中的细胞命运决定.
- 阐明mTOR复合体1 (mTORC1) 在营养适应和ISC行为中的作用.
- 了解由营养状况驱动的肠道细胞组成的特定区域变化.
主要方法:
- 利用模型研究肠道营养适应.
- 研究了mTORC1信号在ISC大小和差异化中的作用.
- 分析了Delta表达及其对细胞命运决定的影响.
- 研究老的ISC信号和间歇性禁食的影响.
主要成果:
- mTORC1激活以特定区域的方式增加ISC大小.
- mTORC1信号促进了三角体的表达,有利于肠芽细胞谱系的分化.
- mTORC1的活动抑制了分泌性肠内分泌细胞的分化.
- 在老中,放松的ISC mTORC1信号对饮食无反应,但可以通过间歇性禁食来减轻.
结论:
- mTORC1信号对于ISC命运决定至关重要.
- 这种信号通路使肠道细胞分化的区域控制能够响应营养.
- 终身间歇性禁食可能有助于缓解与年龄相关的ISC mTORC1信号失调.
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