细胞内膜网膜压力和未折叠的蛋白质反应传感器ERN1调节有机尘埃诱导肺炎
Shilpa Kusampudi1, Velmurugan Meganathan1, Vijay Boggaram1
1Department of Cellular and Molecular Biology, Health Science Center University of Texas at Tyler Tyler Texas USA.
FASEB bioAdvances
|July 11, 2025
概括
吸入有机尘埃会通过内质网膜 (ER) 应力和未折叠蛋白质反应 (UPR) 引发呼吸道炎症. 针对ER压力和ERN1激活可能为管理尘埃引起的肺炎提供新的策略.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 呼吸系统医学 呼吸系统医学
背景情况:
- 吸入有机尘埃与呼吸系统疾病有关,慢性炎症是关键因素.
- 有机尘埃暴露会增加活性氧物种 (ROS),导致氧化应激,内质网膜 (ER) 应激,以及未折叠蛋白质反应 (UPR).
- 在调节免疫反应和疾病发展方面,UPR的作用是显著的.
研究的目的:
- 为了研究ER压力和UPR调节有机尘暴露后气道上皮细胞的炎症反应的假设.
- 阐明ER压力传感器ERN1在有机尘引起的肺炎中的特定作用.
主要方法:
- 对Beas2B支气管上皮细胞和小鼠肺部暴露于家禽有机尘埃提取物.
- 评估了ERN1表达和酸化 (Ser724) 使用西式涂抹和免疫染色.
- 使用化学抑制剂 (KIRA6,APY29) 和mRNA敲击来研究ERN1通路.
- 分析了信号通路的参与,包括TLR2/TLR4-Myd88-ROS-NFκB/Stat3和下游炎症媒介 (IL6,CXCL8,亲IL1β).
主要成果:
- 有机尘埃提取物增加了支气管上皮细胞和小鼠肺中的ERN1表达和酸化.
- 发现TLR2/TLR4-Myd88-ROS-NFκB/Stat3通路可以调解ERN1诱导.
- 抑制或淘汰ERN1降低了关键炎症介导体 (IL6,CXCL8,IL1β) 的产生.
- 抑制ERN1还抑制了NFκB-p65,Stat3,Jun和MAPK 8/9.9的激活.
结论:
- 细胞内膜网膜 (ER) 应激和ERN1通路是对有机尘埃的炎症反应的关键组成部分.
- 涉及TLRs,ROS,ERN1和NFκB/Stat3的复杂信号级联微调对有机尘埃的免疫反应.
- 这些发现将ER压力和ERN1确定为有机灰尘引起的肺炎治疗干预的新目标.
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