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Ye Y.,Key Laboratory of Animal Vaccine Development | Ye Y.,South China Agricultural University | Ye Y.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control | Yan G.,Jinan University | And 12 more authors.
Journal of Proteome Research | Year: 2013

Foot-and-mouth disease virus (FMDV) is an important disease agent that can be difficult to effectively eradicate from herds. Because it is an obligate intracellular parasite, the virus has multiple effects on the host cell during infection. Here, a high-throughput quantitative proteomic approach was used to develop an unbiased holistic overview of the protein changes in IBRS-2 cells infected with FMDV. Stable isotope labeling with amino acids in cell culture (SILAC) combined with LC-MS/MS was performed to identify and quantify 1260 cellular and 2 viral proteins after 6 h of infection of IBRS-2 cells with FMDV. Of these identified and measured cellular protein pairs, 77 were significantly up-regulated, and 50 were significantly down-regulated based on significance B ≥ 0.05. The differentially altered proteins included a number of proteins involved in endolysosomal proteases system, cell cycle, cellular growth and proliferation, and immune cell trafficking. Selected data were validated by Western blot. Ingenuity Pathway Analysis revealed that proteins that changed in response to infection could be assigned to defined canonical pathways and functional groupings, such as integrin signaling. The obtained data might not only improve the understanding of the dynamics of FMDV and host interaction but may also help elucidate the pathogenic mechanism of FMDV infection. © 2012 American Chemical Society.

Dai M.,South China Agricultural University | Dai M.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control | Dai M.,Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture | Dai M.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province | And 23 more authors.
Molecular Immunology | Year: 2016

Chickeninterferon alpha (ChIFNα) belongs to type I IFNs that are important antiviral cytokines. We investigated whether ChIFNα plays a role in avian leukosis virus (ALV) infections of chickens. Firstly, we explored the immune response to ALV in vivo by measuring cytokine expression profiles in the spleens and bursas of chickens during the late stages of ALV-J infection. The results indicated that ALV-J infection could induce a mixed Th1/Th2 cytokine response by elevating levels of both interleukin-2 (IL-2) and IL-10. In contrast, tumor necrosis factor alpha (TNF-α) levels decreased in the spleen while interferon beta (IFNβ) and Toll-like receptor 7 (TLR7) expression levels in the bursa increased significantly. This indicated that ALV-J stimulates a Type I IFN response. Next, we found that different ALV subgroups or strains up-regulated chicken IFN regulatory factor 3 (ChIRF-3) promoter activity, suggesting that ALV infection could trigger Type I IFNs pathway in vitro. Accordingly, we further investigated ChIFNα antiviral effects on ALV replication in DF-1 cells by successfully expressing recombinant ChIFNα in Escherichia coli (E. coli) strain BL21. The specific activity of the purified rChIFNα protein was determined to be 4 × 107 U/mL. When added at 4000 U/mL, the recombinant protein restrained ALV replication as measured by decreases in viral protein p27 levels and mRNA expression. This new reagent may be useful for prophylactic and therapeutic drug design. © 2016.

Li Y.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control | Li Y.,Key Laboratory of Animal Vaccine Development | Li Y.,South China Agricultural University | Xie P.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control | And 23 more authors.
Infection, Genetics and Evolution | Year: 2016

Newcastle disease virus (NDV) is the causative agent of Newcastle disease, which is characterized by inflammatory pathological changes in the organs of chickens. The inflammatory response to this disease has not been well characterized. Previous reports showed that the sphingosine-1-phosphate-1 receptor (S1PR1), a G protein-coupled receptor, is important to the activation of inflammatory responses. To understand better the viral pathogenesis and host inflammatory response, we analyzed S1PR1 expression during NDV infection. We observed a direct correlation between chicken embryo fibroblast (CEF) cellular inflammatory responses and S1PR1 expression. Virulent NDV-infected CEF cells also had elevated levels of pro-inflammatory cytokines (IL-1β, IL-6 and IL-18). When S1PR1 was inhibited by using the specific antagonist W146, pro-inflammatory cytokine production declined. Overexpression of S1PR1 resulted in increased virus-induced IL-1β production. S1PR1 expression levels did not impact significantly NDV replication. These findings highlight the important role of S1PR1 in inflammatory responses in NDV infection. © 2015 .

Kang Y.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control | Kang Y.,Key Laboratory of Animal Vaccine Development | Kang Y.,Key Laboratory of Zoonosis Prevention and Control of Guangdong | Kang Y.,South China Agricultural University | And 32 more authors.
Virology Journal | Year: 2014

Background: Newcastle disease (ND) is an OIE listed disease caused by virulent avian paramyxovirus type 1 (APMV-1) strains, which is enzootic and causes large economic losses in the poultry sector. Genotype VII and genotype IX NDV viruses were the predominant circulating genotype in China, which may possibly be responsible for disease outbreaks in chicken flocks in recent years. While ducks and geese usually have exhibited inapparent infections. Methods. In the present study, we investigate the complete genome sequence, the clinicopathological characterization and transmission of two virulent Newcastle disease viruses, SS-10 and NH-10, isolated from domestic ducks in Southern China in 2010. Results: F, and the complete gene sequences based on phylogenetic analysis demonstrated that SS-10 (genotype VII) and NH-10 (genotype IX) belongs to class II. The deduced amino acid sequence was (112)R-R-Q-K/R-R-F(117)at the fusion protein cleavage site. Animal experiment results showed that the SS-10 virus isolated from ducks was highly pathogenic for chickens and geese, but low pathogenic for ducks. It could be detected from spleen, lung, kidney, trachea, small intestine, bursa of fabricius, thymus, pancreas and cecal tonsils, oropharyngeal and cloacal swabs, and could transmit to the naive contact birds. Moreover, it could transmit to chickens, ducks and geese by naive contact. However, the NH-10 virus isolated from ducks could infect some chickens, ducks and geese, but only caused chickens to die. Additionally, it could transmit to the naive contact chickens, ducks, and geese. Conclusion: The two NDV isolates exhibited different biological properties with respect to pathogenicity and transmission in chickens, ducks and geese. Therefore, no species-preference exists for chicken, duck or goose viruses and more attention should be paid to the trans-species transmission of VII NDVs between ducks, geese and chickens for the control and eradication of ND. © 2014 Kang et al.; licensee BioMed Central Ltd.

Song Y.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control | Song Y.,Key Laboratory of Animal Vaccine Development | Song Y.,Key Laboratory of Zoonosis Prevention and Control of Guangdong | Song Y.,South China Agricultural University | And 30 more authors.
Frontiers in Microbiology | Year: 2015

New reassortant H5N8 highly pathogenic avian influenza viruses were isolated from waterfowl in Southern China. Blast analysis demonstrated that the PB2 gene in these viruses were most closely related to A/wild duck/Shangdong/628/2011 (H5N1), while their NP genes were both more closely related to A/wild duck/Shandong/1/2011 (H5N1) and A/duck/Jiangsu/k1203/2010 (H5N8). However, the HA, NA, PB1, PA, M, and NS genes had the highest identity with A/duck/Jiangsu/k1203/2010 (H5N8). Phylogenetic analysis revealed that their HA genes belonged to the same GsGd H5 clade detected in China in 2010. Therefore, we supposed that these H5N8 viruses might be novel reassortant viruses that have a H5N8 backbone while acquiring PB2 and NP genes from H5N1 viruses. This study is useful for better understanding the genetic and antigenic evolution of H5 avian influenza viruses in Southern China. © 2015 Song, Cui, Song, Ye, Zhao, Wu, Xu, Jiao and Liao.

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