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组织内在的β-catenin信号对抗节点驱动的前内皮内皮分化
Sina Schumacher1, Max Fernkorn1, Michelle Marten1
1Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Dortmund, Germany.
Nature communications
|June 13, 2024
概括
组织内在因素,如β-catenin活性,限制前内皮内皮 (AVE) 差异化. 这揭示了AVE种群是如何单独从表皮质和内皮内皮相互作用中产生的,这对哺乳动物胚胎轴模式至关重要.
科学领域:
- 发育生物学是发展生物学.
- 干细胞生物学 干细胞生物学
- 胚胎发生是胚胎发生.
背景情况:
- 哺乳动物胚胎的前后轴由前内皮内皮 (AVE) 建立.
- 现有的模型表明,节点信号促进了AVE差异化,而BMP梯度则在空间上限制了它.
- 组织内在因素在限制AVE分化中的作用尚不清楚.
研究的目的:
- 调查空间限制的AVE差异化背后的机制.
- 为了确定AVE分化是否可以独立于胚胎外外皮发生.
- 为了确定调节AVE规范的组织内在因素.
主要方法:
- 使用双层胚胎状聚合物,这些聚合物来自缺少外胚胎外皮的小鼠胚胎干细胞.
- 培养纯内脏内皮以研究节点信号激活.
- 评估了与节点信号传递和AVE差异化相关的β-catenin活性.
主要成果:
- 在缺乏外胚外皮的工程胚胎模型中展示了空间受限的AVE分化.
- 在 Nodal 信号激活后,在纯内脏内皮培养物中观察到 AVE 细胞集群的形成.
- 确定了β-catenin活性作为一个关键的组织内在因素,对抗节点诱导的AVE分化.
结论:
- 类似于AVE的种群可以来自于表皮质和内皮内皮之间的唯一相互作用.
- β-catenin活性在限制AVE分化方面发挥着关键作用,独立于外部梯度.
- 这种机制为胚胎轴在各种几何形状上的模式提供了一个灵活而强大的策略.
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