寻常性银屑病患者外周血单一核细胞IFN-γ受体和TNF-α受体mRNA表达的研究

mRNA expressions of IFN-gamma receptor and TNF-alpha receptor in peripheral blood mononuclear cells of patients with psoriasis vulgaris

目的探讨寻常性银屑病患者外周血单一核细胞IFN-γ受体mRNA和TNF—α受体mRNA的表达及其在银屑病发病机制中的作用。方法采集50例寻常性银屑病患者外周静脉血，分离单一核细胞后，以RT—PCR法检测其IFN-γ受体mRNA和TNF-α受体mRNA的表达，PASI评分法评估银屑病的严重程度。以24例正常人作对照。结果50例银屑病患者外周血单一核细胞IFN—γ受体mRNA的表达均值为1．11±0．55，其中37例进行期患者为1．13±0．57，13例静止期患者为1．03±0．52，正常人对照组为0．72±0．17，银屑病患者显著高于正常人对照组（P=0．0034），进行期显著高于正常人对照组（P=0．008），而静止期与正常人对照组差异无统计学意义。正常人对照组和银屑病患者外周血单一核细胞TNF—α受体mRNA的表达水平差异无统计学意义。银屑病患者外周血单一核细胞IFN-γ受体mRNA表达水平与TNF-α受体mRNA表达水平及PASI值均无相关性。结论IFN-γ受体mRNA在寻常性银屑病患者外周血单一核细胞中异常高表达，但与疾病的活动性无关。

Objective To investigate the rnRNA expressions of IFN-gamrna receptor and TNF-alpha receptor in peripheral blood mononuclear cells （PBMCs） of patients with psoriasis vulgaris and their role in the pathogenesis of psoriasis. Methods Fifty patients with psoriasis vulgaris （37 cases of active psoriasis and 13 cases of stable psoriasis） and 24 healthy human controls were included in this study. PBMCs were isolated from blood samples obtained from all patients and controls. The mRNA expressions of IFN-gamma receptor and TNF-alpha receptor in PBMCs were detected by RT-PCR. The disease severity in patients was evaluated by psoriasis area and severity index （PASI）. Results The rnRNA expressions of IFN-gamma receptor and TNF-alpha receptor were observed in the PBMCs of all subjects. The mRNA expression levels of IFN-gamma receptor were 0.72 ± 0.17 in healthy controls, 1.11 ±0.55 in all patients with psoriasis, 1.13 ±0.57 in patients with active psoriasis and 1.03 ±0.52 in patients with stable psoriasis, respectively. A significant increase was observed in the expression levels of IFN-gamma receptor mRNA in all psoriatic patients and in patients with active psoriasis compared with those in healthy controls （both P 〈 0.05 ）, but there was no significant difference between the healthy controls and patients with stable psoriasis （P 〉 0.05 ）. The expression levels of TNF-alpha receptor mRNA were 2.05 ±1.34 in healthy controls, 2.70 ±3.80 in all psoriatic patients, 2.90 ±4.40 in patients with active psoriasis, 2.14 ±1.05 in patients with stable psoriasis, respectively; there was no significant difference between psoriatic patients and healthy controls （P 〉 0.05）. However, no correlation was found between the mRNA expression of IFN-gamma receptor, that of TNF-alpha receptor, and disease severity in psoriatic patients. Conclusions The mRNA expression of IFN-gamma receptor in PBMCs is up-regulated in patients with psoriasis vulgaris, which is unrelated to the activity of psoriasis.