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在肺膜上皮细胞中阿里碳水化合物受体的激活限制了炎症,并保护了肺上皮细胞的完整性
Elizabeth Zimmerman1, Anne Sturrock1,2, Christopher A Reilly3
1Division of Respiratory, Critical Care and Occupational Pulmonary Medicine, University of Utah Spencer Fox Eccles School of Medicine, Salt Lake City, UT.
膜上皮细胞中的基碳化合物受体 (AHR) 有助于在受伤期间保持肺部完整性. 使用FICZ激活AHR可降低炎症并保持肺屏障功能,为肺部疾病提供治疗潜力.
科学领域:
- 肺部医学 肺部医学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 酸受体 (AHR) 是一个在肺部表达的受体/转录因子.
- 在肺损伤和修复过程中,在膜上皮细胞 (AEC) 中AHR的特定作用尚未完全理解.
研究的目的:
- 研究AHR在膜上皮细胞中调节炎症反应和在肺损伤和修复期间保持膜完整性的作用.
主要方法:
- 利用初级小鼠AECs和MLE-15上皮细胞系.
- 在试验室和LPS诱导的急性肺损伤小鼠模型中给药了AHR配体FICZ.
- 使用shRNA和CRISPR-Cas-9来击败AHR的表达.
- 评估了炎症性细胞因子表达,蛋白质泄漏,中性粒细胞积累,表皮-介质细胞转换 (EMT) 标记物和屏障功能 (跨表皮电阻).
主要成果:
- 用FICZ激活AHR抑制了对刺激的反应中的炎症性细胞因子表达.
- 在体内,FICZ与LPS联合使用减少了肺损伤标志物和炎症.
- AHR激活抑制了TGF-β诱导的EMT基因表达.
- 抑制AHR导致中介细胞基因 (αSma,Col1a1,Fn1) 的表达增加和上皮细胞基因 (Col4a1,Sdc1) 的减少.
- 缺乏 AHR 的 MLE-15 细胞显示伤口快速关闭.
- FICZ治疗增强了AEC屏障功能,并减轻了受伤引起的衰退.
结论:
- 膜上皮层AHR激活在维护肺部完整性方面发挥着至关重要的作用.
- 在AEC中,AHR调节炎症反应,增强屏障功能,并限制压力诱导的介酶过渡.
- 针对AHR可能为肺损伤和修复提供治疗策略.
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