缝线诱导大鼠角膜血管新生过程中环氧化酶2和基质金属蛋白酶2的表达

背景:研究表明环氧化酶2和基质金属蛋白酶2在角膜新生血管的发生中起重要作用,但其具体机制及相互关系仍不明确.目的:观察环氧化酶2和基质金属蛋白酶2在缝线法诱导的大鼠角膜新生血管中的表达,并分析其相关性,探讨角膜新生血管形成的有关机制.方法:采用缝线法建立SD大鼠角膜新生血管模型,术后每日裂隙灯观察角膜新生血管的生长情况,并于1,4,7,14,21 d取材,行免疫组化及RT-PCR检测环氧化酶2和基质金属蛋白酶2蛋白的分布及二者mRNA的相对表达量,并进行相关性分析.结果与结论:角膜缝线后三四天可见明显从角膜缘伸入角膜的毛刷状小血管,垂直角膜缘切线方向,角膜缝线处水肿;7 d角膜新生血管生长旺盛,角膜水肿继续加重,14 d新生血管延伸到达或超过缝线位置,分支密集并互相吻合形成袢状血管;21 d角膜新生血管变细.免疫组化及RT-PCR显示环氧化酶2和基质金属蛋白酶2于缝线后表达逐渐增加,7 d达高峰,以后随炎症细胞的减少而减弱,主要分布于炎症细胞胞质及新生血管内皮细胞,两种因子的表达在角膜新生血管中具有正相关性(r=0.981,P<0.05).证实炎症相关的角膜新生血管中环氧化酶2和基质金属蛋白酶2的表达增加,并且与新生血管的发生、发展密切相关.

Expressions of cyclooxygenase-2 and matrix metalloproteinase-2 in suture-induced corneal neovascularization in rats

BACKGROUND:Studies has demonstrated that cyclooxygenase-2(COX-2) and matrix metalloproteinase-2(MMP-2) may play an important role in corneal neovascularization(CNV),but their mechanisms and interactions remain unclear.OBJECTIVE:To investigate the expressions of COX-2 and MMP-2 in suture-induced CNV,and to analyze the interaction between COX-2 and MMP-2,additionally,to explore the mechanisms of CNV.METHODS:The models of CNV were induced by corneal stitch.The development of CNV was monitored daily under slit-...