基质金属蛋白酶2和金属蛋白酶2组织抑制因子及转化生长因子β_1在糖尿病性白内障患者晶状体上皮细胞的表达及意义

Expression and significance of transforming growth factor-β_1,matrix metalloproteinase-2 and its inhibitor in lens epithelial cells of diabetic cataract

目的 探讨基质金属蛋白酶 2 (matrixmetalloproteinase 2 ,MMP 2 )、金属蛋白酶 2组织抑制因子 (tissueinhibitorofmetalloproteinase 2 ,TIMP 2 )及转化生长因子 β1(transforminggrowthfoctorbeta ,TGF β1)在糖尿病性白内障患者的晶状体上皮细胞中的表达及意义。方法 应用免疫组化技术检测 2 3例糖尿病性白内障患者和 7例正常人的晶状体上皮细胞中MMP 2、TIMP 2及TGF β1的表达 ,并进行比较。结果 糖尿病性白内障患者晶状体上皮细胞中MMP 2和TGF β1的阳性表达率与正常人比较 ,差异均有非常显著意义 (χ2 =2 4 5 48,16 78;P <0 0 1) ,而糖尿病性白内障患者晶状体上皮细胞中TIMP 2的阳性表达率与正常人比较 ,差异无显著意义 (χ2 =0 6 2 1,P >0 0 5 )。经Spearman等级相关分析 ,晶状体上皮细胞中 ,MMP 2和TGF β1的阳性表达率存在正相关 (r =0 5 16 ,P <0 0 1) ;MMP 2和TGF β1与TIMP 2阳性表达率间均无相关 (r =- 0 0 45 ,0 0 42 ;P >0 0 5 )。结论TGF β1介导的MMP 2和TIMP 2表达失衡在糖尿病性白内障患者晶状体前、后囊膜下纤维化的发生和发展过程中起重要作用。

Objective To investigate the expression and significance of transforming growth factor-β 1 (TGF-β 1), matrix metalloproteinase-2 (MMP-2) and tissue inhibitor of metalloproteinase-2 (TIMP-2) in human Lens epithelial cells (LEC) of diabetic cataract. Methods Immunohistochemical staining was used to detect the expression of TGF-β 1, MMP-2 and TIMP-2 in the diabetic LEC (23 cases) and the normal LEC (7 cases). Results There was significant difference of expression of MMP-2 and TGF-β 1 between diabetic LEC and normal LEC (P<0.01).But there was no statistic significance for TIMP-2 expression (P>0.05). There was correlation between the expression of TGF-β 1 and MMP-2. Conclusion The imbalance induced by TGF-β 1 between the expression of MMP-2 and TIMP-2 may play a critical role in the pathological fibrosis of anterior and posterior subcapsula during the development of diabetic cataract.