CaMKKβ调节转录因子Elf2基因甲基化,以保持内皮结节屏障的完整性
bioRxiv : the preprint server for biology
|March 10, 2025
概括
/卡尔莫杜林依赖蛋白酶β (CaMKKβ) 缺陷通过高甲基化Elf2基因,减少Tie2和VE-cadherin的表达,并导致肺血管损伤,损害了内皮屏障的完整性.
科学领域:
- 内皮细胞生物学 内皮细胞生物学
- 血管恒温的分子调节 血管恒温的分子调节
- 对内皮基因的转录控制.
背景情况:
- 内皮屏障完整性对于血管平衡至关重要,由内皮细胞 (EC) 中的Tie2和VE-cadherin表达维持.
- Ets转录因子调节Tie2和VE-cadherin,但它们的转录控制尚未完全理解.
- 目前正在研究CaMKKβ在内皮功能中的作用.
研究的目的:
- 研究CaMKKβ在调节内皮膜屏障完整性的作用.
- 阐明控制Elf2,Tie2和VE-cadherin表达的转录机制.
- 了解CaMKKβ缺乏对肺血管损伤的影响.
主要方法:
- 在Camkkβ缺乏的小鼠中进行全基因组甲基化分析.
- 对Elf2,Tie2和VE-cadherinmRNA和蛋白质水平的分析.
- 使用人类肺部微血管内皮细胞进行体外研究.
- 在体内研究涉及EC特异性的Camkkβ删除和Elf2淘汰赛小鼠.
- 用5-azacytidine (5-AZA) 治疗和表达CaMKKβ变体.
主要成果:
- 卡姆克β缺乏导致Elf2基因高甲基化,Elf2,Tie2和VE-cadherin的表达减少,并加剧了肺血管损伤.
- 在EC和小鼠中,CaMKKβ的耗尽或删除减少了Elf2,Tie2和VE-cadherin的表达.
- 在Camkkβ缺乏的小鼠中,5-AZA治疗或野生类型的CaMKKβ表达恢复了基因表达.
- MeCP2抑制了Elf2的表达,而Elf2的缺乏损害了内皮屏障的完整性.
结论:
- 通过调节ELF2表达,CaMKKβ对于维持内皮屏障完整性至关重要.
- 通过DNA甲基化的表观遗传调节在CaMKKβ介导的内皮基因控制中起着关键作用.
- Elf2对于Tie2和VE-cadherin的表达和内皮屏障功能至关重要.
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