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Transcriptome profiling identifies immune response genes against porcine reproductive and respiratory syndrome virus and Haemophilus parasuis co-infection in the lungs of piglets

  • Zhang, Jing (Key Laboratory of Livestock and Poultry Major Epidemic Disease Monitoring and Prevention, Institute of Animal Husbandry and Veterinary Science, Guizhou Academy of Agricultural Sciences) ;
  • Wang, Jing (Key Laboratory of Livestock and Poultry Major Epidemic Disease Monitoring and Prevention, Institute of Animal Husbandry and Veterinary Science, Guizhou Academy of Agricultural Sciences) ;
  • Zhang, Xiong (Key Laboratory of Livestock and Poultry Major Epidemic Disease Monitoring and Prevention, Institute of Animal Husbandry and Veterinary Science, Guizhou Academy of Agricultural Sciences) ;
  • Zhao, Chunping (Key Laboratory of Livestock and Poultry Major Epidemic Disease Monitoring and Prevention, Institute of Animal Husbandry and Veterinary Science, Guizhou Academy of Agricultural Sciences) ;
  • Zhou, Sixuan (Key Laboratory of Livestock and Poultry Major Epidemic Disease Monitoring and Prevention, Institute of Animal Husbandry and Veterinary Science, Guizhou Academy of Agricultural Sciences) ;
  • Du, Chunlin (Key Laboratory of Livestock and Poultry Major Epidemic Disease Monitoring and Prevention, Institute of Animal Husbandry and Veterinary Science, Guizhou Academy of Agricultural Sciences) ;
  • Tan, Ya (Key Laboratory of Livestock and Poultry Major Epidemic Disease Monitoring and Prevention, Institute of Animal Husbandry and Veterinary Science, Guizhou Academy of Agricultural Sciences) ;
  • Zhang, Yu (College of Animal Science, Guizhou University) ;
  • Shi, Kaizhi (Key Laboratory of Livestock and Poultry Major Epidemic Disease Monitoring and Prevention, Institute of Animal Husbandry and Veterinary Science, Guizhou Academy of Agricultural Sciences)
  • Received : 2021.05.10
  • Accepted : 2021.10.20
  • Published : 2022.01.31

Abstract

Background: Co-infections of the porcine reproductive and respiratory syndrome virus (PRRSV) and the Haemophilus parasuis (HPS) are severe in Chinese pigs, but the immune response genes against co-infected with 2 pathogens in the lungs have not been reported. Objectives: To understand the effect of PRRSV and/or HPS infection on the genes expression associated with lung immune function. Methods: The expression of the immune-related genes was analyzed using RNA-sequencing and bioinformatics. Differentially expressed genes (DEGs) were detected and identified by quantitative real-time polymerase chain reaction (qRT-PCR), immunohistochemistry (IHC) and western blotting assays. Results: All experimental pigs showed clinical symptoms and lung lesions. RNA-seq analysis showed that 922 DEGs in co-challenged pigs were more than in the HPS group (709 DEGs) and the PRRSV group (676 DEGs). Eleven DEGs validated by qRT-PCR were consistent with the RNA sequencing results. Eleven common Kyoto Encyclopedia of Genes and Genomes pathways related to infection and immune were found in single-infected and co-challenged pigs, including autophagy, cytokine-cytokine receptor interaction, and antigen processing and presentation, involving different DEGs. A model of immune response to infection with PRRSV and HPS was predicted among the DEGs in the co-challenged pigs. Dual oxidase 1 (DUOX1) and interleukin-21 (IL21) were detected by IHC and western blot and showed significant differences between the co-challenged pigs and the controls. Conclusions: These findings elucidated the transcriptome changes in the lungs after PRRSV and/or HPS infections, providing ideas for further study to inhibit ROS production and promote pulmonary fibrosis caused by co-challenging with PRRSV and HPS.

Keywords

Acknowledgement

We thank Dr. Chang Liu (Guizhou University of Traditional Chinese Medicine) for providing guidance on data analysis.

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