目的：研究角膜碱烧伤后基质损伤修复病程中多形核中性白细胞(PMNs)的浸润和基质金属蛋白酶-9(MMP-9)的表达的关系。

方法：建立25只家兔角膜碱烧伤模型，分别于伤后3、7、14、21、28d随机处死5只兔，裂隙灯下观察角膜病理修复情况，摘除角膜做病理切片，测定PMNs的浸润量值。免疫组化法测定MMP-9的表达。

结果：PMNs和MMP-9在角膜碱烧伤后的3d开始升高，14d上升达到最大峰值，之后逐渐降低，碱烧伤后角膜基质在第14d溃疡面积及深度最为严重。

结论：角膜碱烧伤病灶中PMNs和MMP-9的量值呈正相关，且角膜的病理损伤与PMNs的浸润和MMP-9的表达密切相关。

METHODS: Cornea alkali-burned model was made in 25 rabbits, then animals were grouped and sacrificed at 3d, 7d, 14d, 21d and 28d, respectively. The condition developing of alkali-burned cornea was observed by slit lamp biommicroscopy. The corneas were enucleated for histopathological examination. The infiltration of PMNs was identified by hematoxylin eosin(HE)staining and the expression of MMP-9 was identified by immunohistochemisty in different periods.

RESULTS: The quantity of PMNs and MMP-9 increased on the 3d, reached the lower level on 7d, shown a peak on the 14d, then decreased gradually. The area and depth of corneal stroma after alkali burn were the most severe on the 14d.

CONCLUSION: During the wound healing process, alkali-burned cornea has close relation with the infiltration of PMNs and the expression of MMP-9. The infiltration of PMNs and the expression of MMP-9 is positively correlated in corneal stroma injury after alkali burn.