摘要
目的观察内毒素（ＬＰＳ）对肺微血管内皮细胞（ＰＭＶＥＣ）单层通透性和肌动蛋白骨架的影响，探讨与β受体和Ｇｓα蛋白变化的关系及山莨菪碱的干预作用。方法体外培养大鼠ＰＭＶＥＣ，采用放射性配基结合分析法和流式细胞仪技术。结果ＬＰＳ在体外可诱导ＰＭＶＥＣ单层通透性增高和中央Ｆ－肌动蛋白发生解聚、密度明显减低，同时出现β受体下调及Ｇｓα蛋白水平降低；山莨菪碱对上述变化有明显抑制作用。结论ＬＰＳ可直接导致ＰＭＶＥＣ单层通透性增高，并与Ｆ－肌动蛋白重排相关。山莨菪碱可能通过影响ＰＭＶＥＣ膜β受体和Ｇｓα蛋白两个环节，参与调控ＰＭＶＥＣ的肌动蛋白骨架变化，减轻ＬＰＳ所致的大鼠ＰＭＶＥＣ单层通透性增高。
AIM Observing the influence of lipopolysaccharide (LPS) on changes of the permeability and actin cytoskeleton of rat pulmonary microvascular endothelial cells (PMVEC) monolayer, we explore their relationship with β-adrenoceptor(βＡＲ) and G protein subunit(Gsα), and the interfering action of anisodamine. METHODS PMVEC was isolated and cultured from Wistar rat in vitro, radi- oligand binding assay and flow cytometer were used. RESULTS After incubation of LPS in vitro, the central F-actin of PMVEC depolymerized and its density decreased obviously , while the permeability of PMVEC monolyer increased significantly. Meanwhile it was found that LPS can induce the down regulation of 5-AR and Gsa protein level. Anisodamine can in- hibit these changes above. CONCLUSION LPS can directly cause the increase of permeability of PMVEC monolayer which relates to the depolymerization of central F-actin in PMVEC. Anisodamine may take part in regulating actin cytoskeleton of PMVEC and attenuate LPS-induced the increase of permeability of PMVEC monolaver by influencing two links of both β-AR and Gsa protein
出处
《中国药理学通报》
CAS
CSCD
北大核心
2001年第2期197-199,共3页
Chinese Pharmacological Bulletin
基金
国家自然科学基金资助课题
No 39600062
30070334
