中文摘要：

目的 研究在Jurkat细胞上敲减Itk蛋白的表达对细胞增殖及炎症相关的细胞因子产生的影响,为Itk作为小分子药物靶标提供可行性实验依据.方法 针对Itk基因设计合成三个shRNAs,通过与pEGFP-C1-hItk质粒共转染,观察其抑制Itk-GFP融合蛋白的表达情况,筛选有效序列包装成慢病毒颗粒.将慢病毒颗粒感染Jurkat细胞,观测Itk蛋白的表达水平、细胞增殖情况及细胞因子的变化.结果 Itk-shRNA1感染Jurkat细胞后Itk基因的mRNA水平与细胞对照组及感染shRNAnon的对照组相比,敲减率约55%,差异有统计学意义P＜0.05.Itk蛋白的敲减导致Jurkat细胞在受刺激时增殖降低,以未感染病毒的Jurkat细胞受刺激后酶标仪检测的A值为1,Itk-shRNA1感染组平均比值为0.54,shRNAnon对照组平均比值为0.83,两组差异有统计学意义,P＜0.05.Itk-shRNA1感染组中IL-2、IL-5、IL-10及IFN-γ等细胞因子水平均较shRNAnon对照组低,差异有统计学意义,提示Itk蛋白的表达减少导致Jurkat细胞产生细胞因子减少.结论 抑制Itk表达能有效降低淋巴细胞的增殖,同时减少与炎症相关细胞因子分泌.

英文摘要：

Objective To study the effect of Itk down regulation on Jurkat cell proliferation and inflammatory cytokines production, and provide useful data for Itk as an attractive target for potential drugs.Methods Three shRNAs against different region of Itk were constructed and cotransfected with pEGFP-C1-hItk. The shRNA, which can knock down Itk, was selected and packed into lentivirus. After Jurkat cells were transfected with shRNA lentivirus, the change of Itk protein expression, cell proliferation and cytokines production was observed. Results Itk mRNA was reduced about 55% in Jurkat cells transfected with ItkshRNA1, compared with that in control cells shRNAnon （P ＜ 0. 05 ）. Knocking down Itk expression had a profound inhibitory effect on Jurkat cell proliferation. In addition, there was a substantial decrease in level of cytokines, such as IL-2, IL-5, IL-10 and IFN-γ, produced by cell transfected with Itk-shRNA1.Conclusion Knocking down Itk expression can inhibit Jurkat cell proliferation and inflammatory cytokines production.