霉酚酸影响T细胞增殖及细胞因子表达的体外实验

目的： 探讨霉酚酸（MPA）或与抗B7-1单克隆抗体联用对T细胞增殖的影响及其机制。 方法： 体外建立T细胞反应系统，BrdU掺入法检测T细胞增殖，RT-PCR及ELISA法检测细胞因子IL-2、IFN-γ、IL-10的mRNA及蛋白表达水平。 结果： （1）50 μmol/L MPA能明显抑制T细胞增殖，与对照组相比，差异显著（P＜0.01)。（2）MPA可抑制IL-2、IFN-γ表达，增强IL-10表达。IL-2蛋白表达水平在MPA 组明显低于对照组(42.73 ng/L±14.64 ng/L vs 99.70 ng/L±9.15 ng/L，P＜0.01)；IFN-γ蛋白表达水平在MPA组明显低于对照组（7.87 ng/L±4.22 ng/L vs 82.42 ng/L±25.55 ng/L，P＜0.05)；与对照组比较，MPA明显增强IL-10表达水平（770.95 ng/L±126.85 ng/L vs 545.71 ng/L±22.45 ng/L，P＜0.05）；联用抗B7-1单抗能加强此效应（941.90 ng/L±56.61 ng/L vs 770.95 ng/L±126.85 ng/L，P＜0.05)。（3）IL-2、IFN-γ mRNA表达量在MPA组均明显低于对照组（0.74±0.10 vs 1.17±0.15，0.52±0.05 vs 0.75±0.12，P＜0.01）；IL-10 mRNA表达水平在MPA处理组与对照组间差异不明显，但与抗B7-1单抗联用后，其表达水平高于单用MPA组（1.28±0.06 vs 0.84±0.09，P＜0.01）。 结论： MPA可改变细胞因子表达谱，促使Th1亚群向Th2亚群偏移可能是其发挥免疫负调节作用的机制之一；联用抗B7-1单抗可能有一定协同效应。

Effect of mycophenolic acid on T lymphocyte proliferation and cytokine expression in vitro

AIM: To investigate the effect of mycophenolic acid (MPA) alone or in combination with anti B7-1 mAb on proliferation of T lymphocytes and the possible mechanisms. METHODS: The proliferation of T lymphocytes was detected by BrdU incorporation method. The expressions of IL-2, IFN-γ and IL-10 in mRNA and protein levels were detected by RT-PCR and ELISA, respectively. RESULTS: (1) MPA markedly inhibited the T lymphocyte proliferation as compared with control (P<0.01). (2) MPA significantly inhibited the levels of IL-2 and IFN-γ (42.73 ng/L±14.64 ng/L vs 99.70 ng/L±9.15 ng/L, P<0.01; 7.87 ng/L±4.22 ng/L vs 82.42 ng/L±25.55 ng/L, P<0.05), and significantly increased content of IL-10 compared with control (770.95 ng/L±126.85 ng/L vs 545.71 ng/L±22.45 ng/L, P<0.05). MPA in combination with anti B7-1 mAb obviously enhanced the content of IL-10 compared with MPA alone (941.90 ng/L±56.61 ng/L vs 770.95 ng/L±126.85 ng/L, P<0.05). (3) The expression levels of IL-2 and IFN-γ mRNA in the MPA group were obviously lower than those in control (0.74±0.10 vs 1.17±0.15, 0.52±0.05 vs 0.75±0.12, P<0.01). MPA in combination with anti-B7-1 mAb showed a statistically significant increase in IL-10 mRNA expression (1.28±0.06 vs 0.84±0.09, P<0.01) as compared with MPA alone. CONCLUSION: MPA induces the changes of cytokine expressive spectrum and the Th1 and Th2 shift might be involved in the immunosuppressive effect. The combination of MPA with anti B7-1 mAb might have a synergic effect.