Brd4在血管光滑肌细胞中的作用:对衰老和血管功能障碍的影响
Jiaxing Sun1,2, Yu Gui1, Hao Yin3
1Department of Biochemistry and Molecular Biology and Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Alberta, Canada. (J.S., Y.G., B.Y., X.-L.Z.).
Arteriosclerosis, thrombosis, and vascular biology
|May 22, 2025
概括
血管光滑肌细胞中含有原蛋白4 (Brd4) 的耗尽会诱导衰老并加剧血管衰老. 这突出了 Brd4 的重要性.
科学领域:
- 表观遗传学和衰老研究.
- 血管生物学和光滑肌肉细胞功能.
- 细胞衰老的分子机制
背景情况:
- 越来越多的证据将表观遗传阅读器Brd4与衰老和相关疾病联系起来.
- Brd4在血管衰老中的特定作用,特别是在光滑肌肉细胞 (SMC) 衰老中,尚不清楚.
研究的目的:
- 研究Brd4影响血管衰老和SMC衰老的机制.
- 在体外和体外,确定 Brd4 耗尽在血管光滑肌细胞中的功能后果.
主要方法:
- 在初级小鼠大动脉SMC中使用化学抑制剂 (ARV-825, (+) -JQ1) 和基因操纵 (Ad-Cre病毒) 的Brd4抑制和淘汰.
- 通过SA-β-gal染色来评估细胞衰老.
- 产生一种可诱导的SMC特定Brd4淘汰 (SMC-Brd4-KO) 鼠标模型.
- 在对照和SMC-Brd4-KO小鼠中评估血管功能 (动脉收缩性,血压,硬度) 和对血管素II (Ang II) 的反应.
- 大动脉组织的转录组分析 (RNA测序).
主要成果:
- 在SMCs诱导的细胞衰老中抑制或击倒Brd4.
- 在SMC-Brd4-KO小鼠中,大动脉硬度增加,血压增加,动脉收缩能力提高.
- Brd4表达在老老鼠大动脉和老化的人类SMC中减少.
- 在Ang II输注后,SMC-Brd4-KO小鼠表现出加剧的血管衰老特征,与改变的收缩反应和遗传变化,包括微管基因的下调,如Tuba4a.
- 损伤的自和耗尽的α-tubulin在体外被确定为 Brd4 耗尽诱导的SMC衰老的潜在媒介.
结论:
- 在SMC中Brd4的耗尽足以诱导衰老并防止新密度的形成.
- Brd4在维持血管功能和预防与年龄相关的血管疾病方面发挥着至关重要的作用.
- 向Brd4可能为血管衰老和相关病理提供治疗潜力.
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