血统追踪确定了异质肝细胞细胞对细胞系和胚胎后器官生长动态的贡献
Iris A Unterweger1,2, Julie Klepstad3,4, Edouard Hannezo5
1University of Copenhagen, NNF Center for Stem Cell Biology (DanStem), Copenhagen N, Denmark.
PLoS biology
|October 4, 2023
概括
肝脏原生细胞通过各种血统选择精确地确定肝细胞与胆道上皮细胞 (BEC) 的比例,独立于以后的增殖. 胚胎细胞通过空间多样化的扩张和多体化驱动成人肝脏的生长.
科学领域:
- 发展生物学 发展生物学
- 有机体的产生.
- 斑马鱼模型 斑马鱼模型
背景情况:
- 器官的大小和结构对于从胚胎到成人的生理功能至关重要.
- 肝脏的功能架构依赖于肝细胞和胆道上皮细胞 (BEC) 的比例,这些比例来自祖先分化.
- 单个祖先对这些细胞命运的确切贡献和它们的比例仍然不清楚.
研究的目的:
- 解决单个肝脏原始体对肝细胞和BEC命运及其比例的贡献.
- 了解控制肝脏组织结构和器官生长的机制.
- 为了研究胚胎发育和胚胎后生长期间的祖先细胞行为.
主要方法:
- 在斑马鱼中全器官,多谱FRaeppli-NLS血统追踪.
- 数学建模用于分析祖先分化和血统决策.
- 纵向谱系追踪延伸到成年期,以研究胚胎后生长.
主要成果:
- 精确的BEC-to-hepatocyte比率是快速建立的,并且仅通过从单一和双强祖先的异质血统决定.
- 这种比率的确定是独立于随后的细胞类型特定的增殖.
- 胚胎细胞在成年时表现出空间异质的3D生长,有证据表明特定于叶片的主导生长行为.
- 在未成年人中观察到大量的肝细胞多重积分,这表明在胚胎后肝脏生长中发挥了作用.
结论:
- 异质原体对细胞类型比例的贡献是建立肝脏组织结构的关键.
- 空间异质的生长和原始细胞的细胞比例是成年人肝脏形成的关键机制.
- 斑马鱼的血统追踪揭示了对肝脏发育和生长动态的新见解.
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