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Position: Home > Articles > Expression and bio-activity analysis of recombinant goat IL-18 gene Chinese Journal of Veterinary Science 2008,28 (7) 816-819

重组山羊白细胞介素-18基因的表达及活性分析

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:
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1 mmol/L IPTG诱导4 h以上进行表达,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抗血清,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。另外发现,该重组蛋白还可以保护小鼠抵御PRV强毒的攻击。这为阐明重组gIL-18的活性以及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 and bio-activity analysis of recombinant goat IL-18 gene
作  者:
LIU Wen-qiang1,ZHAO Hong-kun2(1.College of Agriculture,Liaocheng University,Liaocheng,Shangdong 252059,China;2.College of Animal Science and Technology,Shandong Agricultural University,Tai′an,Shandong 271018,China)
关键词:
goat;IL-18;expression;bioactivity
摘  要:
The recombinant plasmid pET-gIL-18 harboring gIL-18 gene and pET32a(+) vector in E.coli BL21(DE3) was induced by 1 mmol/L IPTG for 4 h or more time for expression.The fusion protein of pET and gIL-18 was expressed and SDS-PAGE analysis indicated that the molecular weight of the recombinant protein is about 38 000.Western blotting test indicated that recombinant gIL-18 can react with specific poly-antibodies.The recombinant protein can stimulate the proliferation of PBMCs and induce IFN-γ production in MDBK cells after being denatured,re-natured and purified.The results showed that the recombinant protein have most of the bioactivities of native IL-18.The recombinant protein also can protect mice against the challenge of PRV virulent strains.The study is to clerify the biological activity of the recombinant interleukin-18 and helpful to the clinical use as the immune and therapy adjuvant.

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