目的:观察血管紧张素转化酶(ACE)、血管紧张素Ⅱ1型(AT1)和2型(AT2)受体在银屑病患者皮损和非皮损以及正常皮肤中的表达特征,探讨血管紧张素系统与银屑病发病机制中表皮角质形成细胞过度增殖和异常角化的关系。方法:用免疫荧光组织化学方法和常规病理技术检测ACE、AT1和AT2受体在12例银屑病患者典型皮损和非皮损以及5例正常皮肤组织中的表达和分布规律。结果:在正常皮肤组织,ACE的表达主要定位于表皮基底层角质形成细胞,AT1和AT2受体在整个表皮层均有阳性表达,但荧光信号较弱。在银屑病患者非皮损处,ACE、AT1和AT2受体的表达与正常皮肤相似。在银屑病皮损中的表皮层角质形成细胞ACE表达明显增加,整个表皮层均可见较强绿荧光颗粒,真皮浅层成纤维细胞亦可见绿色荧光颗粒。和ACE的表达变化类似,在银屑病皮损中AT1和AT2受体表达也明显增加,表皮全层可见分布密集的荧光颗粒,真皮浅层成纤维细胞也可见荧光颗粒。结论:在银屑病患者皮损处肾素-血管紧张素系统(RAS)被激活,AngⅡ产生和其受体表达增加,AngⅡ可能通过其受体参与银屑病患者皮损处角质形成细胞的过度增殖角化不全的组织学改变。
Objective:To observe the expression characteristics of angiotensin-converting enzyme(ACE),angio- tensinⅡ(AngⅡ)type 1(AT1),and type 2(AT2)receptors in human normal skin and psoriasis,and to explore their role in the pathogenesis of psoriasis.Methods:The morphological characteristics of skin lesion from 12 pa- tients with psoriasis and normal skin were examined by histopathological method,and the expression and distribu- tion of ACE as well as both AT1 and AT2 receptors were detected with immunofluorescence s...