Th1/Th2细胞因子在眼肌型重症肌无力转基因小鼠模型中的作用机制

目的 观察重组人乙酰胆碱受体(H-AChR) γ亚单位免疫HLA-DQ8转基因小鼠眼肌型实验性自身免疫性重症肌无力(oEAMG)模型体外培养上清液中Th1/Th2细胞因子水平变化,探讨其与oEAMG免疫学发病机制的联系。方法 HLA-DQ8转基因小鼠用乳化于完全弗氏佐剂(CFA)的重组H-AChR γ亚单位,或E. Coli提取物,或纯CFA分别免疫,分别于第0天、第30天和第60天共免疫3次。第3次免疫后28 d,处死小鼠后取淋巴结和脾淋巴细胞体外培养,收集培养上清液,采用ELISA法检测白细胞介素(IL)-2、γ-干扰素(IFN-γ)、IL-6和IL-10水平。结果 H-AChR γ组小鼠淋巴结及脾淋巴细胞体外培养上清液中IL-2(F=42.835,P<0.001;F=38.030,P<0.001)和INF-γ水平(F=76.332,P<0.001;F=34.865,P<0.001)均明显高于E. coli组和CFA免疫组;IL-6(F=1.325,P=0.284;F=1.935,P=0.166)和IL-10水平(F=0.908,P=0.417;F=1.189,P=0.322)与E. coli 组和CFA组差异无统计学意义。结论 Th1细胞因子在重组H-AChR γ亚单位诱导HLA-DQ8转基因小鼠所建立oEAMG模型的发病机制中可能发挥重要作用,而Th2细胞及其细胞因子作用尚不十分明确。

Mechanism of Th1/Th2 Cytokines in HLA-DQ8 Transgenic Mice Model of Ocular Experimental Autoimmune Myasthenia Gravis

Objective To analyze the levels of cytokines (IL-2,IFN-γ,IL-6,IL-10) associated with Th1 and Th2 cells in HLA-DQ8 transgenic mice model of ocular experimental autoimmune myasthenia gravis (oEAMG) induced by recombinant H-AChR γ subunit immunization.Methods DQ8 mice were immunized with 20 μg of AChR γ subunit,20 μg of crude E. coli extract (E. coli group),or complete Freund’s adjuvant (CFA) only (CFA group). All mice were immunized on days 0,30,and 60. Mice were euthanized 28 days after the third immunization,and draining lymph node cells (LNC) and spleen lymphocytes were cultured in vitro. The supernatant was collected to observe the interleukin(IL)-2,interferon(IFN)-γ,IL-6,IL-10 production by ELISA.Results LNCs and spleen lymphocytes of H-AChR γ subunit-immunized mice exhibited significantly enhanced IFN-γ (F=76.332,P<0.001;F=34.865,P<0.001) and IL-2 (F=42.835,P<0.001;F=38.030,P<0.001),which associated with Th1 cells,as compared to E. coli group and CFA group. There were no significant differences in IL-6 (F=1.325,P=0.284;F=1.935,P=0.166) and IL-10 (F=0.908,P=0.417;F=1.189,P=0.322) levels,which secreted by Th2 cells,among these three groups.Conclusion Th1 cytokines play key roles in the pathogenesis of oEAMG,while the mechanism of Th2 cytokines for oEAMG remains unclear.