畜牧兽医学报 ›› 2010, Vol. 41 ›› Issue (2): 135-140.

• 遗传繁育 • 上一篇    下一篇

猪维甲酸诱导基因I的克隆及其在诱导I型干扰素中的作用

王荡1,2 ,方六荣1,2 ,梅小伟1,2 ,谢立兰1,2 ,陈焕春1,2 ,肖少波1,2*
  

  1. 1.华中农业大学动物医学院 动物病毒室,武汉 430070;2.华中农业大学 农业微生物学国家重点实验室,武汉 430070
  • 收稿日期:2009-04-13 修回日期:1900-01-01 出版日期:2010-02-24 发布日期:2010-02-24
  • 通讯作者: 肖少波

Molecular Cloning and Function Study on Induction of Type I Interferon of Porcine Retinoblastomainhibiting Gene I

WANG Dang 1 ,2 ,FANG Liurong 1 ,2 ,MEI Xiaowei 1 ,2 ,XIE Lilan 1 ,2 ,CHEN Huanchun 1 ,2 ,XIAO Shaobo 1 ,2 *
  

  1. 1.Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University,Wuhan 430070,China; 2.National Key Laboratory of Agriculture Microbiology,Huazhong Agricultural University,Wuhan 430070,China
  • Received:2009-04-13 Revised:1900-01-01 Online:2010-02-24 Published:2010-02-24
  • Contact: XIAO Shaobo

摘要: 本研究旨在探讨猪维甲酸诱导基因I (RIGI)的结构特征及其在I型干扰素信号通路中的作用。从猪外周血单核细胞中克隆猪RIGI全长cDNA,进一步构建猪RIGI全长及不同区域缺失突变体的真核表达载体,通过IFNβ、IRF3和NFκB的荧光素酶报告系统分析猪RIGI在诱导I型干扰素中的作用。结果表明,猪RIGI开放读码框全长为2 832 bp,编码943个氨基酸,与鸭嘴兽、大鼠、小鼠、猴、黑猩猩、人、马和牛RIGI相应序列的同源性为53.2%~83.2%。猪RIGI超表达能显著激活转录因子IRF3和NFκB,并诱导IFNβ的产生。缺失猪RIGI的 CARD 区不仅不能激活下游信号,而且还负调控poly(I:C)诱导IFNβ的能力。结果提示RIGI是猪天然免疫系统中的一个模式识别受体,在I型干扰素诱导的信号通路中具有重要作用。

关键词: 猪, RIGI, 克隆, 序列分析, 干扰素, 信号通路

Abstract: This experiment was conducted to study the structural characterization of porcine RIGI (poRIGI) and its role in type I interferon signal pathway. The full length cDNA of poRIGI was amplified from porcine peripheral blood mononuclear cells (PBMCs) by RTPCR. The eukaryotic expression vector of poRIGI fulllength and the mutated poRIGI were constructed, respectively. The role of poRIGI in the induction of type I interferon was investigated by using IFNβ, IRF3 and NFκB luciferase reporter system. The results showed that the open reading frame of poRIGI is 2 832 bp encoding 943 amino acids. The putative poRIGI protein exhibited identity with the corresponding sequences of platypus, rat, mouse, monkey, chimpanzee, human, horse and cattle ranging from 53.2% to 83.2%. Overexpression of the fulllength poRIGI significantly induced the expression of IFNβ by activating transcription factors NFκB and IRF3. The mutant CARD lacking poRIG1 was not capable of activating downstream signals and inhibited poly(I:C)mediated IFNβ production. These results indicate that poRIGI is a pattern recognition receptor in innate immune system of pig and plays an important role in the induction of type I interferon.

Key words: porcine, RIGI, cloning, sequence analysis, interferon, signal pathway