中国农业科学 ›› 2005, Vol. 38 ›› Issue (05): 1034-1039 .

• 畜牧·兽医·资源昆虫 • 上一篇    下一篇

重组鸡白细胞介素2的诱导表达与生物学活性测定

陈吉刚,陈维虎,周继勇,王金勇,齐静,郑肖娟,俞照正,孙红霞   

  1. 浙江大学动物预防医学研究所病毒与免疫研究室
  • 收稿日期:2004-10-28 修回日期:1900-01-01 出版日期:2005-05-10 发布日期:2005-05-10
  • 通讯作者: 周继勇

In vitro Expression and Bioactivity of Chicken Interleukin-2

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  1. 浙江大学动物预防医学研究所病毒与免疫研究室
  • Received:2004-10-28 Revised:1900-01-01 Online:2005-05-10 Published:2005-05-10

摘要: 将去除信号肽的鸡IL-2基因编码框克隆到原核表达载体pBAD/His B,实现了重组鸡IL-2(rchIL-2)蛋白在大肠杆菌中的高效表达。SDS-PAGE分析显示,表达蛋白的分子量约为18 kD。用rchIL-2为抗原制备了单克隆抗体和多克隆抗体,建立了检测rchIL-2含量的抗原捕获ELISA,探讨了天然chIL-2蛋白的体外表达动力学。非变性条件下纯化的rchIL-2 (0.4 ng) 对Con A活化的鸡T淋巴细胞具有明显的增殖活性,而对鸭及鹅的T淋巴细胞无增殖活性。抗chIL-2多克隆抗体可完全中和rchIL-2和天然chIL-2蛋白的生物学活性,而单克隆抗体无中和rchIL-2和天然chIL-2蛋白生物学活性的功能。这些研究结果证实,大肠杆菌表达的rchIL-2及其多克隆抗体拥有生物学功能,而获得的单克隆抗体不具有chIL-2的中和特性。

关键词: 鸡, 白细胞介素-2, 生物学活性, 单克隆抗体, 多克隆抗体, 抗原捕获ELISA

Abstract: In this study, the recombinant chicken interleukin-2 (rchIL-2) was successfully produced in the pBAD/His B expression system induced by L-(+)-arabinose. By SDS-PAGE analysis, the observed molecular weight of rchIL-2 fusion protein without the signal peptide was 18 kD. Monoclonal and polyclonal antibodies specific for rchIL-2 were produced. These antibodies were used to develop a mAb-based antigen capture ELISA (AC-ELISA). Based on the constructed AC-ELISA, in vitro kinetics of endogenous chicken IL-2 production were detected. The soluble rchIL-2 protein purified under native conditions was shown to activate the proliferation of chicken lymphocytes stimulated by Con A for 24 h in a dose-dependent manner. This activity cannot be neutralized by mAbs to chIL-2, but can be neutralized by anti-chIL-2 polyclonal antibody. These results demonstrated that the E.coli-derived rchIL-2 and polyclonal antibody to chIL-2 have bioactivity.

Key words: Chicken, Interleukin-2, Bioactivity, Monoclonal antibody, Polyclonal antibody, Ag capture ELISA