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香烟烟雾改变流量,诱导PP2A膜贩运和内皮细胞透性

Abdoulaye J Dabo^1,2, Sonya Raghavan³, Wendy Ezegbunam¹

¹Division of Pulmonary & Critical Care Medicine, Department of Medicine, State University of New York Downstate Health Sciences University, Brooklyn, NY, USA.

Scientific reports

|November 14, 2024

概括

香烟烟雾通过改变蛋白酸酶2A (PP2A) 活性来破坏肺内皮屏障功能. 这导致细胞透率增加,有助于肺病的进展.

科学领域:

肺部医学肺部医学
细胞生物学细胞生物学
生物化学生化学

背景情况:

气囊毛细管屏障的破坏是慢性阻塞性肺病 (COPD) 的标志,导致,炎症和肺损伤.
了解香烟烟雾损害肺内皮屏障功能的分子机制,对于开发向疗法至关重要.

研究的目的:

研究香烟烟雾如何调节蛋白酸酶2A (PP2A) 活性和在人肺微血管内皮细胞 (HLMVECs) 中的局部化.
阐明PP2A在香烟烟雾引起的内皮膜超透性的作用及其对肺屏障完整性的影响.

主要方法:

暴露于香烟烟雾的HLMVECs,并评估了PP2A活性,局部化和奥克卢丁酸化的变化.
用药学抑制PP2A和操纵细胞内水平来确定它们对内皮透性的影响.
用蛋白质分离和西区块分析分析了PP2A分布和PTP1B活性.

主要成果:

暴露在香烟烟雾中降低了整体PP2A活性,并增加了HLMVEC的透性.
PP2A从细胞质转移到膜,降低了奥克卢丁酸化并增强了屏障泄漏性.
香烟烟雾降低了蛋白氨酸酸酶1B (PTP1B) 的活性,这与改变的流量和随后的PP2A失调有关.
降低细胞内可以防止香烟烟雾引起的细胞质PP2A活动减少.

结论:

香烟烟雾会损害肺内皮屏障功能,因为它会诱导PP2A的依赖的转移到膜上.
这种机制涉及PP2A介导的奥克卢丁脱化,导致内皮透性增加,并可能导致COPD病原性.
准PP2A或信号通路可能为减轻香烟烟雾引起的肺损伤提供治疗策略.

关键词:

和香烟烟雾一样.慢性阻塞性肺病是一种慢性阻塞性肺病.脑内皮质 (Endothelium) 是一个内皮.炎症炎症是一种炎症.透性透性的蛋白酸酶2A是一种蛋白质酸酶.

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