LRRC8A/TRIM21轴通过阻断FAK/NF-κB通路而加剧心肌缺血/反损伤
Liming Hou1, Xiaoming Wang1, Min Bai1
1Department of Geriatrics, Xijing Hospital, The Fourth Military Medical University, Xi'an 710032, China.
Biochemical pharmacology
|July 6, 2025
概括
富含白的重复含有蛋白8A (LRRC8A) 通过促进心肌细胞亡,加剧心肌缺血-再输液 (MI/R) 损伤. 沉默LRRC8A保护心脏免受MI / R损伤,改善心脏功能,提供潜在的治疗点.
科学领域:
- 心脏病学 心脏病学
- 分子生物学分子生物学
- 细胞生理学 细胞生理学
背景情况:
- 心肌缺血-再输血 (MI/R) 损伤是心肌梗塞再输血治疗的主要并发症.
- 富含白的重复含有蛋白8A (LRRC8A),一个体积调节的离子通道,与心血管事件有关,但其在MI/R中的作用尚不清楚.
研究的目的:
- 调查LRRC8A在MI/R损伤中的作用.
- 阐明LRRC8A在心脏损伤中的潜在分子机制.
主要方法:
- 建立了一种老鼠MI/R模型,并使用腺病毒介导的shRNA来使LRRC8A沉默.
- 在H9c2细胞中利用氧-葡萄糖剥夺/再氧化 (OGD/R) 来模仿MI/R.
- 评估了心肌梗塞的大小,心肌细胞亡 (TUNEL染色,Bcl-2表达),心脏功能和蛋白质相互作用 (TRIM21,FAK/NF-κB通路).
主要成果:
- 在MI/R后的老鼠心脏中,LRRC8A表达被上调.
- 沉默LRRC8A降低了心脏病发作的大小,抑制了心肌细胞亡,并在MI/R大鼠中改善了心脏功能.
- LRRC8A沉默保护了H9c2细胞免受OGD/R诱导的亡,而上调则增加了它.
- LRRC8A与TRIM21相互作用,抑制FAK/NF-κB通路以促进细胞亡.
结论:
- LRRC8A通过与TRIM21的相互作用和FAK/NF-κB通路的抑制促进心肌细胞亡,在MI/R损伤中发挥有害作用.
- 准LRRC8A代表了减轻MI/R损伤和保持心脏功能的一种潜在治疗策略.
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