ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (11): 2521-2528.doi: 10.11843/j.issn.0366-6964.2018.11.025

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The Effect of Co-infection of H9N2 Subtype Avian Influenza Virus and Newcastle Disease Virus on Virus Replication in the DF-1 of Chicken Embryo Fibroblasts

XIE Jun1,3,4,5, SUN Ying-jie2, ZHOU Chang-luan2, ZHU Shan-yuan5, DING Chan2*, BAI Jia-lin1,3,4*   

  1. 1. Key Lab of Bioengineering of the State Ethnic Affairs Commission, Northwest Minzu University, Lanzhou 730030, China;
    2. Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China;
    3. Gansu Engineering Research Center for Animal Cell, Northwest Minzu University, Lanzhou 730030, China;
    4. Faculty of Life Science and Engineering, Northwest Minzu University, Lanzhou 730030, China;
    5. Jiangsu Key Laboratory of Veterinary Biotechnologic Drug, Jiangsu Agri-animal Husbandry Vocational College, Taizhou 225300, China
  • Received:2018-01-23 Online:2018-11-23 Published:2018-11-23

Abstract:

The co-infection of avian influenza virus (AIV) and Newcastle disease virus (NDV) in Chickens is common clinical incident. To study the effect of co-infection of AIV (H9N2) and NDV (Herts/33) on virus replication in the DF-1 of chicken embryo fibroblasts, the replication of AIV and NDV in the DF-1 was first analyzed respectively and post-infection 12 and 24 h were selected as sample collecting time. The Western blot, immunofluorescence assay and real-time fluorescence quantitative PCR (qPCR) were conducted to compare the replication of AIV and NDV between co-infection and individual infection groups. Compared with the single virus infection group, the intensity band ratio of NDV NP in Western blot analysis in 12 and 24 h post-infection were down-regulated by 70.6% (P<0.001) and 45.7% (P<0.001),while AIV NP was down-regulated by 61.5% (P<0.001) and 82.8% (P<0.001), respectively. The optical intensity band ratio of AIV NP and NDV NP were decreased by 81.1% (P<0.001) and 65.5% (P<0.001) in 12 h post-infection, 41.2% (P<0.05) and 47.4% (P<0.001) in 24 h post-infection. The relative mRNA expression of NDV NP in co-infection in 12 and 24 h post-infection was descended by 64.3% (P<0.001) and 64.4% (P<0.05), while AIV NP was 61.5% (P<0.001) and 63.0% (P<0.001), respectively. These findings indicate that co-infection of AIV and NDV is able to inhibit their replication at cellular level, laying the foundation of further study the mechanism of common infection of AIV and NDV.

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