增长板休息区的冠状细胞在Hedgehog激活时获得暂时的克隆能力,并有效地转化为状骨骨质
bioRxiv : the preprint server for biology
|July 3, 2023
概括
副甲状腺激素相关蛋白 (PTHrP) 阳性休息区冠状细胞中的刺信号激活驱动它们的增殖和转化为骨质母细胞. 这揭示了骨干细胞在生长板调节中的命运的新机制.
科学领域:
- 骨生物学 骨生物学
- 发展生物学 发展生物学
- 干细胞生物学 干细胞生物学
背景情况:
- 产后生长板的休息区含有表达副甲状腺激素相关蛋白 (PTHrP) 的慢循环冠状细胞.
- 这些PTHrP+冠状细胞的一个子集是骨干细胞,对于柱状冠状细胞形成至关重要.
- PTHrP-Indian hedgehog (Ihh) 反循环对于生长板功能至关重要,但控制PTHrP+静止胆细胞命运的机制尚不清楚.
研究的目的:
- 为了研究刺信号在调节PTHrP+休息区冠状细胞的细胞命运中的作用.
- 阐明这些软质细胞转化为骨质母细胞的分子机制.
主要方法:
- 使用一种可以诱导他莫西芬的PTHrP-creER小鼠模型.
- 雇佣的floxed Patched-1 (Ptch1) 和 tdTomato 记者等位基因来激活和追踪刺信号后代.
- 分析了克隆扩张,细胞增殖和激活细胞的血统追踪.
主要成果:
- 在PTHrP+冠状细胞中鼠激活诱导了克隆扩张,在休息区形成了"补丁".
- 这种激活导致了显著更宽的冠状细胞列和生长板的增生.
- 被激活的PTHrP+细胞的后代迁移到隔膜体,并分化为骨骨质.
结论:
- 刺信号激活促进PTHrP+休息区冠状细胞的增殖,使他们走向骨质性命运.
- 这项研究揭示了一种新的子介导的途径,用于骨干细胞分化为骨质母细胞.
- 这些发现为增长板调节和骨发育提供了新的见解.
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