Avian influenza virus H5N1 induces rapid interferon-beta production but shows more potent inhibition to retinoic acid-inducible gene I expression than H1N1 in vitro

Virology Journal

Yigang Tong²  Yonghong Ma¹  Zhiqiang Mi² 

[1] Center for Disease Control and Prevention in Xinjiang Military Command, Xinjiang Uygur Autonomous Region, Xinjiang Uygur, 830000, China;Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da Street, Beijing, Fengtai District, 100071, China

关键词: RIG-I;    Interferon-beta;    Avian influenza virus H5N1;   

Others  :  1154271
DOI  :  10.1186/1743-422X-9-145

 received in 2012-01-05, accepted in 2012-07-30,  发布年份 2012

【 摘 要 】

Background

The mechanisms through which the avian influenza virus H5N1 modulate the host’s innate immune defense during invasion, remains incompletely understood. RIG-I as a pattern recognition receptor plays an important role in mediating innate immune response induced by influenza virus. So, modulating RIG-I might be adopted as a strategy by influenza virus to antagonize the host’s innate immune defense.

Methods

Here we chose an avian influenza virus A/tree sparrow/Henan/1/04 (H5N1) directly isolated from a free-living tree sparrow in Mainland China which is amplified in egg allantoic cavity, and researched its interferon induction and manipulation of RIG-I expression compared with influenza virus A/WSN/1933(H1N1), a well characterized mouse adapted strain, in human lung epithelial A549 cells and human embryonic kidney 293T cells.

Results

Although the avian influenza virus H5N1 infection initiated a rapid IFN-beta production early on, it eventually presented a more potent inhibition to IFN-beta production than H1N1. Correspondingly, the H5N1 infection induced low level expression of endogenous RIG-I, an Interferon Stimulating Gene (ISG), and showed more potent inhibition to the expression of endogenous RIG-I triggered by exogenous interferon than H1N1.

Conclusions

Manipulating endogenous RIG-I expression might constitute one of the mechanisms through which avian influenza virus H5N1 control the host’s innate immune response during infection.

【 授权许可】

   
2012 Mi et al.; licensee BioMed Central Ltd.

【 图 表 】

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