表皮细胞生长因子及其受体在难愈性溃疡组织中的表达特征

目的 :探讨表皮细胞生长因子 (EGF)及其受体 (EGFR)在正常皮肤、溃疡边缘和溃疡组织中的分布、表达特征及其与溃疡形成的关系。方法 :采用常规病理技术和免疫组织化学方法鉴定这两种蛋白在 8例难治性皮肤溃疡患者 8份不同类型的皮肤溃疡组织及其对应溃疡边缘和周围正常皮肤组织中的定位及表达量的变化规律。结果 :在正常皮肤中 ,EGF主要存在于表皮细胞、真皮成纤维细胞、毛囊上皮细胞和内皮细胞的胞浆和胞外基质中 ;而 EGFR的阳性信号则分布于这些细胞的细胞膜和胞浆中。从正常皮肤经溃疡边缘到溃疡中心 ,EGF及其受体的蛋白表达呈降低趋势 ,在溃疡组织中 ,EGF和 EGFR呈弱阳性表达 ,两种蛋白的阳性表达率分别降低至正常皮肤的 (7.1± 5 .2 ) %和 (8.8± 5 .5 ) % ,呈非常显著性差异 (P均 <0 .0 1)。结论 :溃疡创面难愈性修复可能与 EGF及其受体蛋白表达下降 ,细胞因子与受体结合发生障碍 ,修复信号不能正常传递有关。

Characteristics of epidermal growth factor and its receptor expression in dermal chronic ulcers

OBJECTIVE: To investigate the expression and location of epidermal growth factor (EGF) and its receptor (EGFR) in dermal chronic ulcers and normal skin in order to explore their influence on ulcer formation. METHODS: The expression intensity and distribution of EGF and EGFR were detected with pathological method and immunohistochemistry method in 8 cases of dermal ulcers, 8 cases of edge of ulcer and 8 cases of normal skin. RESULTS: The Positive signals of EGF could be found in epidermal cells, endothelial cells and some fibroblasts; EGFR was principally located in the cytoplasm and cellular membrane of these cells mentioned above in normal skin. From normal skin, edge of ulcer to ulcerative tissues, the protein contents of EGF and EGFR were decreased progressively. In ulcerative tissues, EGF was mostly distributed in monocytes and macrophages while EGFR was chiefly sited in monocytes. When compared with normal skins, the protein expression of EGF and EGFR was notably reduced in ulcerative tissues (both P<0.01). The positive cellular ratios of two proteins were reduced to (7.1+/-5.2) % and (8.8+/-5.5) % of those in normal skin respectively (all P<0.01). CONCLUSION: The formation of dermal chronic ulcers is closely associated with the reduction of EGF and EGFR protein expression which may lead to binding obstruction between EGF and its receptor.