Survivin和PI3K、AKT在寻常型银屑病皮损角质形成细胞中的表达及其相关性

目的 探讨凋亡抑制蛋白Survivin和PI3K、AKT在寻常型银屑病(PV)进行期斑块状皮损角质形成细胞(KCs)中的表达水平及作用.方法 临床上收集22例PV患者进行期斑块状皮损以及18例正常皮肤组织.采用免疫组织化学、Western blot和real-time quantitative PCR等方法检测22例PV患者进行期斑块状皮损和18例正常皮肤组织中KCs的Survivin、PI3K和AKT表达,并分析它们在PV皮损KCs中的相关性.使用小干扰RNA(siRNA)在HaCaT细胞中沉默AKT,并通过Western blot实验检测Survivin的表达水平.结果 PV皮损KCs中Survivin、PI3K和AKT的蛋白表达水平均高于正常皮肤组织.PV皮损KCs中Survivin和PI3K mRNA表达成正相关(r=0.4510;P=0.0351);PV皮损KCs中Survivin和AKT mRNA表达成正相关(r=0.4423;P=0.0393);在HaCaT细胞中,沉默AKT后可引起Survivin的表达下调.结论 凋亡抑制蛋白Survivin与PI3K/AKT信号通路可能参与了PV的发生与发展.

Expressions of survivin,PI3K and AKT in keratinocytes in skin lesions and their pathogenic role in psoriasis vulgaris

Objective To explore the role of survivin and PI3K/AKT pathway in the pathogenesis of psoriasis vulgaris (PV). Methods Plaque-like lesions collected from 22 patients with PV in progressive stage and 18 normal control skin specimens were examined using immunohistochemical staining, Western blotting and real-time quantitative PCR for expressions of survivin, PI3K and AKT in the keratinocytes, and their correlation was analyzed. A small interfering RNA (siRNA) was used to knock down AKT in cultured HaCaT cells, and Western blotting was used to detect the changes in the expression of survivin. Results Compared with normal skin, PV lesions showed obviously up-regulated expressions of survivin, PI3K and AKT in the keratinocytes. Survivin expression was positively correlated with PI3K (r=0.4510, P=0.0351) and AKT (r=0.4423, P=0.0393) in the keratinocytes in PV lesions. In cultured HaCaT cells, siRNA-mediated knockdown of AKT caused down-regulation of survivin expression. Conclusion Survivin and PI3K/AKT signaling pathway may participate in the occurrence and progression of PV.