Dsg3刺激诱导天疱疮患者一级亲属T细胞活化的研究

目的 研究在特异抗原桥粒芯糖蛋白3(desmoglein3,Dsg3)刺激下寻常型天疱疮(PV)患者一级亲属淋巴细胞Th1/Th2、Tc1/Tc2极化状态的变化,探讨PV发生机制.方法 PV患者一级亲属外周血单个核细胞(PBMC)在Dsg3刺激下体外培养3 d,流式细胞仪四色胞内染色分析PV患者一级亲属CD4~+ T细胞和CD8~+T细胞中IFN-γ~+和IL-4~+细胞的百分率,观察PV患者一级亲属Th1/Th2、Tc1/Tc2比例的变化.结果 PV抗体阳性一级亲属中的PBMC经Dsg3刺激培养者与未经Dsg3刺激者比较,Th2、Tc2百分率均显著升高(10.13%±3.72%vs 7.28%±3.58%,20.01%±10.43% vs 14.91%±8.06%,P<0.05);经Dsg3刺激培养后PV抗体阳性一级亲属组与正常对照组比较Th2、Tc2百分率均显著升高(10.13%±3.72%VS 6.10%±2.82%,20.01%±10.43% vs9.58%±5.49%,P<0.05).结论 特异性抗原Dsg3刺激下,自身反应性T细胞活化,Th1/Th2、Tc1/Tc2细胞分化失衡,可能在PV的启动阶段发挥重要作用.

Study on Dsg3 induced activation of T cells in first degree relatives of patients with pemphigus vulparis

Objective To investigate The Th1/Th2 and Tc1/Tc2 polarization in the peripheral blood of first degree relatives of pemphigus vulgaris(PV) and healthy control individuals, and to approach the mechanism of the Dsg3-specific autoimmunity in PV. Methods The peripheral blood mononuclear cells (PBMC) from first degree relatives and healthy control was stimulated for72 h with Dsg3 and without Dsg3. Th1/Th2, Tc1/Tc2 was assessed by four-color flow cytometry. Results The mean frequency of Dsg3-spe-cific Th2 cells for PV antibody positive first degree relatives was 10.13%±3.72%, compared with stimula-tion without antigen 7.28%±3.58%, the difference was significant (P<0.05). The percentage Dsg3-spe-cific Th2 was markedly higher in the PV antibody positive first degree relatives group than that in the control group(10.13%±3.72% vs 6.10%±2.82%, P<0.05) , Tc2 was markedly higher also (20.01%± 10.43% v514.91%±8.06%, 20.01%±10.43% vs 9.58%±5.49%, P<0.05). Conclusion When Dsg3 stimulated PBMC were used to stimulate autologous T cells an increased amount of Th2 and Tc2 was observed, it is implied that the imbalance of Th1/Th2, Tc1/Tc2 might play an important role in the initia-tion of PV.