PM2.5对通过miR-133b-5p/EGFR/Claudin1/MUC5AC轴的气道中的粘液过分分泌的影响
Lerong Chen1, Liangliang Wu1, Xiaopeng Cheng1
1Department of Respiratory, Jiangxi Provincial Chest Hospital, Nanchang 330006, Jiangxi, China.
颗粒物 (PM2.5) 暴露降低了miR-133b-5p的调节,激活了EGFR/MAPK通路. 这导致MUC5AC的高分泌,并加剧了老鼠的呼吸道炎症.
科学领域:
- 环境健康 环境健康
- 分子生物学分子生物学
- 呼吸系统医学 呼吸系统医学
背景情况:
- 颗粒物 (PM2.5) 是一个主要的空气污染物,与呼吸系统疾病有关.
- EGFR/MAPK信号通路在气道炎症和粘液产生中起着至关重要的作用.
- 微RNAs (miRNAs) 正在成为各种生物过程中的关键调节者,包括炎症.
研究的目的:
- 阐明EGFR/MAPK信号通路在PM2.5诱导的MUC5AC高分泌和气道炎症中的作用.
- 为了调查miR-133b-5p在这个过程中的参与.
主要方法:
- 通过将老鼠暴露在PM2.5.5中,建立了一个老鼠模型.
- 干预包括miR-133b-5p和Claudin1.1的过度表达.
- 关键标记物如IL-1,TNF-α,p-EGFR,MUC5AC,p-ERK1/2,p-JNK,p-p38和miR-133b-5p使用ELISA,HE染色,免疫组织化学,西部斑点和qPCR进行测量.
主要成果:
- 暴露于PM2.5会增加血清炎症因子 (IL-1,TNF-α) 和肺组织损伤.
- 在暴露于PM2.5的老鼠中,miR-133b-5p的表达下调,而MUC5AC蛋白的表达增加.
- 观察到EGFR/MAPK通路的激活 (增加了p-EGFR,p-ERK1/2,p-JNK,p-p38) 和减少了Claudin1的表达.
结论:
- PM2.5抑制了miR-133b-5p的表达,导致EGFR/MAPK信号通路的激活.
- 这种激活会诱导MUC5AC的高分泌,从而加剧PM2.5相关的小鼠呼吸道炎症.
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