基质金属蛋白酶-1、肿瘤坏死因子在中耳胆脂瘤中的表达及相关性研究

目的 观察基质金属蛋白酶-1(MMP-1)、肿瘤坏死因子(TNF-α)在中耳胆脂瘤上皮组织中的表达,探讨两者在胆脂瘤骨质破坏中的作用及其相关性.方法 采用免疫组织化学技术(Envision System)和计算机图像定量分析法,检测TNF-α、MMP-1在22例中耳胆脂瘤及20例外耳道皮肤中的表达.结果 TNF-α和MMP-1阳性产物均定位于细胞浆.MMP-1蛋白产物表达于胆脂瘤上皮细胞全层、增殖活跃的基底细胞及淋巴细胞散在表达.TNF-α蛋白产物表达在上皮层及上皮下结缔组织基质细胞.定量分析显示胆脂瘤组织中TNF-α(0.3852±0.0318)和MMP-1(0.2013±0.0106)的表达显著高于外耳道皮肤,两者差异有统计学意义(P＜0.05).结论 (1)MMP-1和TNF-α在胆脂瘤上皮组织中呈高表达.(2)MMP-1和TNF-α的表达有明显相关性(rs=0.5295).(3)MMP-1和TNF-α在基质细胞中均有大量表达,提示基质细胞可能在胆脂瘤的骨质破坏中起着重要的作用.

Expression and correlation of MMP-1 ,TNF-α in cholesteatoma

Objective To observe the expression of MMP-1, TNF-a in cholesteatoma and to determine their roles in the destruction of bone and their correlation. Methods Immunohistochemical method and the computer image quantitative analysis were used to examine the expression of TNF-α and MMP-1 in 22 cases of chotesteatomamiddle ear and 20 cases of normal external acoustic meatus skin. Results Positive stainings of MMP-1 and TNF-α were both localized in cytoplasm. The MMP-1 positive cells were found in all strata of cholesteatoma epithelium and active multiplication stromal cell. TNF-α was expressed in both epithlium and stromal cells. The results of the computer image quantitative analysis showed that the mean optical density of MMP-1 (0. 2013±0. 0106) and TNF-α (0.3852±0.0318) in cholesteatoma were higher than that in normal skin epithelial tissue( P＜0.05 ). Conclusion (1)MMP-1 and TNF-α are overexpressed in cholesteatoma. (2)MMP-1 and TNF-α have a correlation in their expression. (3)MMP-1 and TNF-α are both observed in stromal cells which indicates that stromal cells play an irnportant role in bone destruction.