p21通过DREAM/MMB/Rb-E2F1调节Wnt-Notch平衡,并维持肠干细胞平衡
Liangxia Jiang1, Jie Tian1, Jun Yang1
1Department of Pathophysiology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou, China.
Cell death discovery
|September 28, 2024
概括
失去p21功能会破坏Wnt-Notch信号传递,导致肠道干细胞丧失和加速衰老. 恢复p21功能可以维持干细胞平衡和Wnt-Notch平衡.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 胃肠病学 胃肠病学
背景情况:
- Wnt-Notch信号传递对细胞命运和组织再生至关重要,但其与细胞周期调节和干细胞平衡的联系尚不清楚.
- p21是细胞循环的关键调节剂,其损失可能导致加速衰老的表型.
研究的目的:
- 研究p21在维持肠干细胞平衡中的作用及其与Wnt-Notch信号的联系.
- 阐明将细胞循环调节 (p21-DREAM/MMB/Rb-E2F1通路) 与Wnt-Notch通路中断联系起来的分子机制.
主要方法:
- 在p21损失和加速衰老的小鼠模型中分析分子变化 (p21TKO小鼠).
- 评估肠道干细胞区,细胞增殖 (BrdU),细胞亡 (切割caspase3,道分析) 和特定细胞标记物 (Bmi1,Olfm4,Lgr5).
- 研究细胞周期复杂转变 (DREAM到MMB) 和识别转录调节剂 (E2F1).
主要成果:
- 在p21TKO小鼠中,p21的丧失导致了下调的Wnt3/β-Catenin和上调的Notch1/Hes1,破坏了Wnt-Notch信号传输.
- 这种干扰导致了肠道干细胞的丧失,分泌细胞的减少和上皮细胞的循环增加.
- p21损失导致从DREAM转移到MMB复合体,增加E2F1活动和Notch1转录,这被p21过度表达所拯救.
结论:
- p21对于维持肠道干细胞的顺序调动,增殖和恒常是必不可少的.
- p21-DREAM/MMB/Rb-E2F1通道与Wnt-Notch通道直接连接,而p21则作为这种交叉通话的关键调节器.
- 了解这个调节轴可以了解衰老和肠道干细胞功能障碍.
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