寻常型银屑病患者血清IL-17和IL-18水平的变化及相关性研究

目的探讨寻常型银屑病患者外周血白介素-17(IL-17)和白介素-18(IL-18)的表达及相关性。方法采用酶联免疫吸附法(ELISA)检测108例寻常型银屑病患者(其中进行期42例,静止期19例,退行期47例)和40例健康对照者外周血IL-17、IL-18水平,并与银屑病患者皮损面积和严重程度指数(PASI评分)进行相关性分析。结果 (1)银屑病患者血清IL-17和IL-18水平明显高于对照组(P<0.01);进行期、静止期银屑病患者血清IL-17和IL-18水平均明显高于对照组(P<0.01);而退行期银屑病患者血清IL-17和IL-18水平明显低于对照组(P<0.01)。(2)进行期银屑病患者血清IL-17和IL-18水平明显高于静止期和退行期(P<0.01);静止期银屑病患者血清IL-17和IL-18水平明显高于退行期(P<0.01)。(3)银屑病患者血清IL-17和IL-18水平与PASI评分值间呈直线正相关关系(P<0.01);进行期、退行期银屑病患者血清IL-17和IL-18与PASI评分值间呈直线正相关关系(P<0.05),但静止期银屑病患者血清IL-17和IL-18水平与PASI评分值间无线性关系(P>0.05)。结论IL-17和IL-18可能参与了银屑病的发病进程,并与疾病的严重程度有一定关系。

Study on the Expression of IL-18, AcPL and IL-18BP mRNA in the Psoriatic Lesions

To investigate the role of IL-18 and IL-18 binding protein (IL-18BP) in the pathogenesis of psoriasis, PT-PCR was used to semi-quantitatively analyze the mRNA expression of IL-18, AcPL (accessory protein-like) and IL-18BP in 12 psoriatic lesions and in 6 normal skin tissues. The results showed that IL-18 and AcPL mRNA were present in all specimens from 6 normal skin and 12 pieces of psoriatic skin, and IL-18 and AcPL showed relatively stronger intensity in the psoriatic skin compared with those seen in normal skin (P<0.01). Amplified bands indicating the expression of IL-18BP mRNA were weakly positive in all samples of normal skin. In contrast, the PCR products for IL-18BP were distinctly visible in all specimens of psoriatic lesions (P<0.01). These findings demonstrate that IL-18 is constitutively synthesized by human keratinocytes and involved in the development of the Th1 response in psoriatic lesions, and its bioactivity appears to be closely regulated by cutaneous inflammation.