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目的 研究在成纤维细胞NIH-3T3中IL-13可溶性受体sIL-13Rα2对IL-13的抑制作用,为进一步研究sIL-13Rα2对日本血吸虫感染小鼠体内肝纤维化的治疗作用奠定基础.方法 用ELISA和RT-PCR检测感染日本血吸虫的BALB/c小鼠0、6、8、10和12w不同感染时期肝脏组织IL-13和sIL-13Rα2表达和转录水平.构建sIL-13Rα2表达质粒转染成纤维细胞NIH-3T3,用IL-13(50ng/mL)刺激转染后成纤维细胞NIH-3T3,用RT-PCR和Western blotting分别检测该细胞分泌的Ⅰ型胶原.结果 感染后小鼠肝脏肉芽肿组织中IL-13和sIL-13Rα2 的蛋白表达水平随感染时间的延长而逐渐增高,第8wIL-13水平达到高峰(16.1586 pg/mL),随后逐渐降低但仍高于正常水平(3.4146 pg/mL P =0.017);第10w sIL-13Rα2的分泌达到高峰(4827.426 pg/mL),以后逐渐减低,但仍高于正常水平(4057.112 pg/mL P =0.021).IL-13 和sIL-13Rα2的mRNA转录趋势和ELISA 检测结果 相符合,均随感染时间的延长而增高,分别在第8w和第10w达到最高峰,随后逐渐降低但仍高于正常组小鼠(P =0.033; P =0.025).实验组(sIL-13Rα2=2mg/mL)Ⅰ型胶原mRNA转录水平较正常对照组减低8.83%(P =0.012);蛋白水平较对照组减低7.41%(P =0.031).结论 sIL-13Rα2在NIH-3T3细胞中对IL-13有抑制作用,提示sIL-13Rα2在治疗血吸虫病肝纤维化中具有潜在价值.“,”To determine the inhibition of IL-13 by recombinant sIL-13Rα2 in NIH-3T3 fibroblast cells for its potential therapeutic value in hepatic fibrosis caused by Schistosoma japanicum in mice . IL-13 and sIL-13Rα2 from liver of BALB/c mice infected with S.japonicum at different infection time (weeks 0,6,8,10 and 12) were analyzed by ELISA and RT-PCR. The recombinant sIL-13Rα2 expression plasmidwas constructed, followed by transfection into NIH-3T3 fibroblast cells. TypeⅠcollagen produced by NIH-3T3 cells were examined by RT-PCR and Western blotting. It was demonstrated that the expression of IL-13 increased gradually after infection, reached peak density (16.1586 pg/mL)at week 8 and then reduced but was still higher than the level of control mice(3.4146 pg/mL;P =0.017 ). The secretion of sIL-13R α2 reached to its peak 10 weeks after infection(4827.426 pg/mL)and then reduced slowly but still higher than normal(4057.112 pg/mL; P=0.021). Meanwhile, the changes in mRNA level of IL-13 and sIL-13R α2 were coincided with that examined by ELISA. Both IL-13 and sIL-13Rα2 reached their peak density (P=0.033) at week 8 and 10 (P=0.025) respectively, and they were followed by a slower degree of decrease. The sIL-13Rα2 could significantly inhibit the effect of IL-13 on NIH-3T3 fibroblast cells, showing decreased mRNA level(P =0.012)and protein level of typeⅠcollagen compared with normal groups(P =0.031). It is concluded that the sIL-13Rα2 can inhibit the effect of IL-13 on NIH-3T3 fibroblast cells which leads to a reduced production of typeⅠcollagen, demonstrating its potential therapeutic value in hepatic fibrosis of schistosomiasis.