骨桥蛋白13肽抑制球囊内皮剥脱术后血管狭窄的实验研究

EXPERIMENTAL STUDY ON INHIBITION OF RESTENOSIS BY OSTEOPONTIN OLIGOPEPTIDE ANTAGONIST AFTER DE-ENDOTHELIUM

目的:利用含有骨桥蛋白(OPN)多种功能位点的13肽(Gly158-Lys170),从细胞和整体水平观察其对VSMC和单核巨噬细胞黏附、浸润以及内膜增生的影响,并初步探讨其作用机制。方法:用不同浓度OPN13肽(0,100,200,300mg/L)检测其对体外培养的平滑肌细胞(VSMC)与OPN黏附的抑制作用;以不含黏附序列的6肽分子为对照组,用以确定13肽抑制黏附特异性。用球囊内皮剥脱法建立大鼠内膜增生模型。实验动物分为4组:治疗组大鼠自术前1h及术后静脉滴注13肽,连续给药7d;对照组大鼠给予非特异性对照6肽分子;模型组大鼠给予相同剂量的生理盐水;正常对照组大鼠施假手术。并利用免疫组织化学染色和Western印迹分析方法,检测血管壁中OPN、FAK、ILK的表达变化。结果:OPN13肽能特异性的及浓度依赖性的抑制VSMC与OPN的相互作用,血管内膜剥脱后给予13肽治疗组血管壁单核/巨噬细胞浸润减少,OPN及其下游信号分子ILK,FAK表达下调,内膜增生被明显抑制。结论:含有OPN多功能位点的13肽可通过阻断OPN与膜受体的相互作用而抑制血管炎症的进展和内膜增生。

Osteopontin 13-peptide（Gly^158-Lys^170）, containing multi-fuction domains was used to inhibit the VSMC adhesion, migration. The mechanism of 13-peptide inhibiting neointima formation was investigated. Methods： The effect of 13-peptide on VSMC adhesion was tested by adhesion assay. The restenosis model was prepared balloon injury after administration of 13-peptide for 1 h, and then the 13-peptide was given by an intravenous drip for 7 days. The expression changes of OPN, FAK, ILK in vessel wall were detected by immuohistochemistry and Western blot. Results： The 13-peptide dose-dependently reduced adhesion of VSMC in OPN matrix, and the infiltration of macrophage in vessel wall also was reduced in the treatment group after balloon injury. The expression of OPN, FAK, ILK was down-regulated following with the inhibition of neointima thickening. Conclusion： The OPN 13-peptide can inhibit inflammation and neointima formation by blocking the binding of OPN to it＇s receptors.