摘要目的 探讨吡格列酮对Jurkat T细胞T-bet/GATA-3表达的影响及其与调节TH1/TH2细胞分化作用机制之间的关系.方法 不同浓度的吡格列酮刺激Jurkat T细胞,在不同时间点分别用ELISA法检测TH1/TH2细胞因子表达谱及用RT-PCR检测T-bet和GATA-3 mRNA表达的变化.为探讨实验结果是否为过氧化物酶体增殖激活受体γ(PPAR-γ)依赖性,同时设立加有PPAR-γ特异性拮抗剂GW9662(终浓度为10 mol/L)的对照组.结果 吡格列酮对Jurkat T细胞分泌细胞因子IFN-γ和IL-10的表达均起抑制作用,抑制T-bet和GATA-3 mRNA的表达,并具有浓度和时间依赖性.GW9662可缓解吡格列酮抑制IFN-γ分泌及T-bet mRNA表达,但对于IL-10和GATA-3 mRNA的受抑程度则无明显影响.结论 吡格列酮抑制TH0向TH1细胞分化是PPAR-γ依赖性地通过转录因子Tbet进行调节,对TH2细胞的抑制作用则非PPAR-γ依赖性的转录因子GATA-3途径的负性调节.

abstractsObjective To investigate the role of PPAR-γ in the gene expression of T-bet/GATA-3 in Jurkat T cells,and to explore the mechanisms underling this sensitizing effect of the change of TH cell subpopulation group.Methods Jurkat T cells were stimulated with PPAR-γ agonist pioglitazone.TH cell related cytokine IFN-γ and IL-10 was detected by ELISA,and the expression of transcription factors(T-bet and GATA-3)mRNA was detected by RT-PCR.To prove the PPAR-γ-dependent effect.the PPAR-γ-specific antagonist GW9662 was used.Results Stimulated with agonist PPAR-γpioglitazone.the concentration of IFN-γ and IL-10 and the expression of transcription factor T-bet and GATA-3 mRNA were both significantlY decreased in Jurkat T cells obviously,and these actions were dependent on the time and the concentrations of pioglitazone.Added with antagonist GW9662 at the same time,such inhibitory actions of IFN-γ and T-bet expression were recovered.but not IL-10 and GATA-3.Conclusion Pioglitazone can inhibite T cells proliferation and their secretion of cytokines.Pioglitazone can inhibit TH1 cells from secreting cytokines,and it is a PPAR-γ-dependent effect related to T-bet.The inhibition on TH2 is not a PPAR-γ-dependent effect and it is GATA-3 related.