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Position: Home > Articles > Expression of Goat IL-18 Mature Protein Scientia Agricultura Sinica 2007,40 (7) 1523-1527

山羊白细胞介素-18成熟蛋白的表达

作  者:
刘文强;赵宏坤
单  位:
山东农业大学动物科技学院;聊城大学农学院
关键词:
山羊;白细胞介素-18;表达;活性
摘  要:
【目的】为了阐明重组蛋白的活性,置备具有生物学活性的重组白细胞介素18,应用于畜牧业生产。【方法】将含有山羊白细胞介素(gIL)-18基因的重组质粒pET-32a(+)在大肠杆菌BL21(DE3)中以1mmol·L-1IPTG诱导4h或者更长时间进行表达。【结果】经SDS-PAGE试验检测到了gIL-18与pET载体融合表达的重组蛋白。以该重组蛋白与佐剂混合后,免疫小鼠制备多克隆血清。经Western-blotting试验证实该重组蛋白具有免疫原性。经过包涵体变性、层析柱纯化和复性,证实该蛋白具有诱导MDBK细胞分泌IFN-γ和刺激PBMC增殖的生物学活性。这表明重组蛋白保留了天然蛋白大部分的生物学活性。另外,该重组蛋白还可以保护小鼠抵御PRV强毒的攻击。【结论】这为gIL-18作为免疫佐剂和免疫治疗剂的实际应用奠定了基础。
译  名:
Expression of Goat IL-18 Mature Protein
作  者:
LIU Wen-qiang1,ZHAO Hong-kun2 (1College of Agriculture of Liaocheng University,Liaocheng 252059; 2College of Animal Science and Technology of Shandong Agricultural University,Taian 271018)
关键词:
Goat; IL-18; Expression; Bioactivity
摘  要:
Objective The study was conducted to classify the biological activity of the recombinant interleukin-18 and helpful to the clinical. Method The gIL-18 gene was cloned into pET32a (+) vector. The recombinant plasmid pET-gIL-18 in E. coli BL21 (DE3) was induced by 1mmol·L-1 IPTG for 4h or more time for expression. Result The fusion protein of pET and gIL-18 was expressed. SDS-PAGE analysis suggests that the recombinant protein is about 38kD. Western-blotting indicated recombinant gIL-18 showed a reaction to its specific multi-antibodies. The recombinant protein can stimulate the proliferation of PBMCs and induce IFN-γ production in MDBK cells after denaturation,re-naturation and purification. This indicated that the recombinant proteins have the most bioactivities of native IL-18. The recombinant proteins can also protect mice against the attack of PRV virulent strains. Conclusion They are helpful for the clinical use as an immune adjuvant or therapy of this cytokines.

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