目的:观察细胞间粘附分子-1(intercellular adhesion molecule-1,ICAM-1)含量变化与角膜移植排斥反应的关系.方法:利用缝线诱发新西兰白兔角膜新生血管(corneal neovascularization,CNV)后,制作穿透性角膜移植(penetrating keratoplasty,PKP)模型4组,术后记录移植排斥指数(rejection index,RI);记录植片存活时间;应用酶联免疫吸附(ELISA)双抗体夹心法检测房水及外周血中sICAM-1的含量,免疫组织化学染色法观察ICAM-1的表达.结果:排斥组植片平均存活12.4±1.3d;正常房水和血清中均可检测到少量的sICAM-1,它们的浓度分别为(16.6±3.6)ng/L,(95.2±6.3)ng/L.术后排斥组房水及外周血中sICAM-1含量即升高,至排斥反应前达最高水平分别为(53.9±19.2)ng/L,(378.8±30.6)ng/L,在观察期内维持高水平,排斥反应发生时,免疫组化染色ICAM-1呈强阳性表达.结论:ICAM-1在角膜移植免疫排斥反应中发挥重要作用,术后外周血中sICAM-1浓度变化对排斥反应的发生有一定预测和早期诊断作用.%· AIM: To investigate the role of intercellular adhesion molecule-1 (ICAM-1) in the graft rejection of rabbit penetrating keratoplasty (PKP).· METHODS: Sutures were used to produce corneal neovascularization (CNV) on New Zealand white rabbits to make PKP model. Graft mean survival time and rejection index were determined. The levels of sICAM-1 in serum and aqueous humor were dynamically determined by enzyme-linked immunosorbent assay (ELISA).Immunohistochemical technique was used on cornea to get the evidence of expression and distribution of ICAM-1.· RESULTS: Graft mean survival time is (12.4±1.3) days.The mean sICAM-1 levels in aqueous humor and serum in the control animals that did not undergo surgery were (16.6±3.6)ng/L and (95.2±6.3) ng/L respectively. Levels in aqueous humor and serum for the graft rejection group increased postoperatively, continued to increase to (53.9±19.2)ng/Land (378.8±30.6)ng/L, compared to those in the other group (P ＜0.01). ICAM-1 positive cells were found in the graft rejection group.· CONCLUSION: ICAM-1 plays a critical role in initiating and maintaining corneal graft rejection. Sequential determination of serum sICAM-1 after operation may be of value in the prediction and diagnosis of acute rejection.
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