Acta Veterinaria et Zootechnica Sinica ›› 2022, Vol. 53 ›› Issue (7): 2396-2402.doi: 10.11843/j.issn.0366-6964.2022.07.036

• RESEARCH NOTES • Previous Articles    

Correlation between the Expression Level of USP7 and the Immune Response to Salmonella Infection in Chickens

ZHANG Na1, WANG Fei2, GE Ximin1, ZHAO Guiping1, WEN Jie1, LI Qinghe1*   

  1. 1. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China
  • Received:2021-11-11 Online:2022-07-23 Published:2022-07-23

Abstract: This research aimed to clarify the effect of ubiquitin-specific protease (USP7) on the resistance of chickens to Salmonella Typhimurium infection. Forty 3-day-old White Leghorns were randomly divided into two groups, and respectively intraperitoneal injected with the USP7 inhibitor P5091 and control solvent every other day for 5 consecutive injections (n=20 in each group). Four days after the last injection, they were artificially orally infected with S.Typhimurium. Samples were collected 24 hours after infection. The mRNA abundances of IL-1β, IL-8, TNF-α and NF-κB were examined by RT-qPCR. The bacteria load in the liver of chickens was measured by the plate coating method. Liver and lung inflammation was checked by H&E staining. Inhibition of the USP7 activity by P5091 treatment significantly downregulated the mRNA level of NF-κB, and its downstream cytokines IL-1β, IL-8 and TNF-α. The bacterial load in the liver of chickens decreased. H&E staining showed aggravated inflammation in the liver and lung in USP7 inhibited chickens. USP7 might have critical role in chicken to resist Salmonella infection.

Key words: USP7, Salmonella, immune response, NF-κB, cytokines

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