MMP-3,OPN和TIMP-1在白内障形成中的作用

目的：研究基质金属蛋白酶-3（matrix metalloproteinase-3，MMP-3）、骨桥蛋白（osteopontin，OPN）和金属蛋白酶组织抑制因子-1（tissue inhibitor of metalloproteinase-1，TIMP-1）在白内障晶状体上皮细胞中的表达及意义。方法：采用免疫组织化学方法测定MMP-3，OPN和TIMP-1在31例前囊下性白内障，28例核性白内障和12例正常晶状体上皮细胞中的表达。结果：MMP-3在前囊下性白内障的表达高于核性白内障、正常晶状体（Χ^2=31．49，34．479；均P=0．000），而在核性白内障与正常晶状体中无明显差剐（f=2．449，P=0．118）；OPN在前囊下性白内障的表达高于核性白内障和正常晶状体（0=29．450，15．889；均P=0．000）；TIMP-1表达在3组晶状体上皮细胞中差异均无统计学意义（P〉0．05）；前囊下性白内障MMP-3和OPN的表达水平相关（r=0．381，P=0.035），而MMP-3和OPN与TIMP-1的表达水平不相关（r=0.121，-0．289；P=0．516，0．114）。结论：MMP-3和OPN的表达增强及MMP-3／TIMP-1的表达失衡可能与前囊下性白内障的形成密切相关。

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OBJECTIVE: To investigate the expression and significance of matrix metalloproteinase-3 (MMP-3), osteopontin (OPN) and tissue inhibitor of metalloproteinase-1 (TIMP-1) in human lens epithelial cells (LECs) of cataract. METHODS: The MMP-3, OPN, and TIMP-1 expressions in LECs of anterior subcapsular cataract (31 cases), nuclear cataract (28 cases) and normal lens (12 cases) were detected by immunohistochemistry, respectively. RESULTS: The MMP-3 expression in anterior subcapsular cataract was significantly higher than that in nuclear cataract and normal lens (chi2=31.49, 34.479; P=0.000); but there was no statistic significance between nuclear cataract and normal lens (chi2=2.449, P=0.118). The OPN expression in anterior subcapsular cataract was also significantly higher than that in nuclear cataract and normal lens (chi2=29.450, 15.889; P=0.000). There was no significant difference in the TIMP-1 expression among the 3 groups (P>0.05). Positive correlation was found between MMP-3 and OPN in LECs of anterior subcapsular cataract (r=0.381, P=0.035). But no significant correlation was found among MMP-3, OPN, and TIMP-1 (r=0.121, -0.289; P=0.516, 0.114). CONCLUSION: Increased expression of MMP-3 and OPN and the expression imbalance between MMP-3 and TIMP-1 may play a critical role in the pathogenesis of anterior subcapsular cataract.