在骨折修复过程中,YAP调节了转录程序,用于特定层的骨周扩张
Madhura P Nijsure1,2, Brendan Tobin3,4, Dakota L Jones1,2,5,6
1Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA.
Science advances
|August 6, 2025
概括
是的相关蛋白 (YAP) 和具有PDZ结合动机 (TAZ) 的转录协活性剂调节骨折修复. YAP通过激活像骨形态遗传蛋白4 (BMP4) 这样的基因来控制周骨扩张.
科学领域:
- 分子生物学分子生物学
- 再生医学是一种再生医学.
- 骨生物学 骨生物学
背景情况:
- 骨折修复是由周骨扩张启动的,这是一个涉及祖细胞增殖的过程.
- 在骨折愈合期间控制周骨前代细胞激活的精确转录机制在很大程度上是未知的.
- 骨周,骨修复的关键组织,有明显的内和外纤维层.
研究的目的:
- 阐明在骨折修复过程中控制骨周前代细胞增殖和骨周扩张的转录调节剂.
- 研究YAP和具有PDZ结合动机 (TAZ) 的转录协活性剂在周骨扩张中的作用.
- 为了确定YAP/TAZ信号在骨周中的下游目标.
主要方法:
- 在小鼠模型中利用了YAP和TAZ在Osterix表达细胞中的遗传删除.
- 分析了与YAP激活相关的染色质可访问性变化,重点关注TEA域转录因子 (TEAD) 结合部位.
- 研究了骨形态遗传蛋白4 (BMP4) 在野生类型和淘汰赛小鼠的周骨扩张和骨折愈合中的功能.
主要成果:
- 在表达Osterix的细胞中删除YAP和TAZ显著损害了周骨扩张.
- YAP激活增强了TEAD结合部位的染色质可访问性,并调节了细胞功能.
- 确定了BMP4作为YAP-TEAD标基因;在淘汰赛小鼠中,BMP4的输送促进了周骨扩张,矩阵积累和纤维层细胞增殖,并在野生型小鼠中增强了骨质生成和血管生成.
结论:
- 在骨折修复过程中,YAP/TAZ信号对调节骨周扩张至关重要.
- 通过YAP介导的转录程序,包括BMP4的激活,促进层特异的周骨反应.
- 这些发现揭示了骨再生的关键分子机制,并提供了潜在的治疗点.
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