目的:比较Piroxicam(环氧化酶-1选择抑制剂)和NS-398(环氧化酶-2选择性抑制剂)对角膜新生血管的抑制作用并比较两者对角膜上皮细胞的毒性作用.方法:将含20u g脂多糖的缓释小丸植入兔角膜基质以诱导角膜新生血管.使用不同浓度的Piroxicam和NS-398滴眼剂滴眼,植入10d后分析角膜新生血管的面积.采用MTT法分析Piroxicam和NS-398对角膜上皮细胞的毒性作用.结果:0.01 u mol/L NS-398和口0.01 u mol/L Piroxicam组兔角膜新生血管生长浓密,其它组因抑制剂的不同及浓度的不同角膜新生血管面积有不同程度的减低.在0.5,5及50μmol/L时,NS-398较Piroxicam对角膜上皮细胞的毒性低.结论:环氧化酶-1特异性抑制剂和环氧化酶-2特异性抑制剂对角膜新生血管形成均有抑制作用.相同浓度时,NS-398的抑制效果强于Piroxicam.在高浓度时NS-398较Piroxicam对角膜上皮细胞的毒性低.%AIM: To compare the inhibitive effect of Piroxicam (cyclooxygenase-1 selective inhibitor, COX-1 inhibitor) and NS-398 (cyclooxygenase-2 selective inhibitor, COX-2 inhibitor) on corneal neovascularization and their cytotoxity on corneal epithelial cells in vitro.METHODS: Slow-release pellets containing lipopolysac charide 20 μ g were prepared and implanted into the rabbit' s corneal stroma near the limbus to induce neovascularization. Eye drops containing NS-398 or Piroxicam at various concentrations were applied. Ten days after the implantation of pellet, the neovascularization was examined and cytotoxicity of the two materials on comeal epithelium cells was analyzed by MTT assay.RESULTS: In the 0.01 μ mol/L Piroxicam group, therewas dense neovascularization. In the other groups, neovascularization decreased to different degrees, depending on the drug and concentration applied. The cytotoxicity of NS-398 was lower than that of Piroxicam at 0.5, 5 and 50 μ mol/L and the difference had statistical significance.CONCLUSION: Both COX-1 and COX-2 inhibitors haveinhibitive effect on corneal neovascularization. NS-398 is more inhibitive than Piroxicam at the same concentration,with toxicity less than NS-398.
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