DPP-4通过整合素-α5β1/FAK/AKT信号传递加剧LPS诱导的内皮细胞炎症
Chang Liu1, Jian Xu2, Jiahao Fan1
1Department of Pulmonary & Critical Care Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210029, China.
Experimental cell research
|January 6, 2024
概括
双基酶IV (DPP-4) 通过促进内皮炎症和通透性,加剧急性肺损伤 (ALI). 阻止DPP-4可能为ALI和急性呼吸窘迫综合征 (ARDS) 提供治疗策略.
科学领域:
- 肺和心血管研究研究.
- 细胞和分子生物学是细胞和分子生物学.
- 炎症和免疫学 炎症和免疫学
背景情况:
- 内皮功能障碍是急性肺损伤 (ALI) 和急性呼吸困扰综合征 (ARDS) 的核心原因.
- 双基酸酶IV (DPP-4) 与内皮炎症和屏障破坏有关.
研究的目的:
- 研究DPP-4在人肺微血管内皮细胞 (HPMECs) 脂聚糖 (LPS) 诱导的功能障碍中的作用.
- 阐明DPP-4在ALI/ARDS病变发生过程中的作用的潜在分子机制.
主要方法:
- 在HPMEC中通过siRNA介导的DPP-4的淘汰,这些HPMEC受到LPS的挑战.
- 对细胞因子分泌 (IL-6,IL-8),细胞透性和中性粒细胞-内皮细胞相互作用的分析.
- 西部涂抹以评估托尔样受体4 / 核因子-卡帕B (TLR4 / NF-κB) 途径.
- 共同免疫沉和质谱测量以确定DPP-4相互作用伙伴.
- 用外源溶性DPP-4进行治疗,以激活特定的信号通路.
主要成果:
- 在HPMEC中,LPS挑战增加了DPP-4的产生和释放,以及IL-6和IL-8的分泌.
- DPP-4的敲击降低了化学激素的释放,超透性和中性粒细胞的粘附/迁移.
- DPP-4敲击减弱了TLR4/NF-κB通路的LPS诱导激活.
- 发现DPP-4与整合素-α5β1相互作用,调解LPS诱导的炎症.
- 外源的DPP-4激活了整合素-α5β1,FAK/AKT/NF-κB信号传输,以及ICAM-1上调.
结论:
- 内皮细胞在内毒素压力下合成并释放DPP-4,从而导致内皮炎症和透性.
- DPP-4与整合素-α5β1相互作用,激活下游信号通路,加剧ALI/ARDS.
- 针对DPP-4通过减轻内皮功能障碍,为ALI/ARDS提供了潜在的治疗途径.
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