Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (2): 694-705.doi: 10.11843/j.issn.0366-6964.2023.02.026

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Effects of Interleukin-10 on T Cell Proliferation and Its Expression of TNF-α, IFN-γ and IL-2 in Mice Infected with Foot-and-Mouth Disease Virus

GUO Zijing1,2, CHEN Fei2, ZHANG Zhixiong2, BAI Ling1,2, ZHANG Zhidong1*, LI Yanmin1*   

  1. 1. College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China;
    2. OIE/National Foot and Mouth Disease Reference Laboratory, State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
  • Received:2022-04-07 Online:2023-02-23 Published:2023-02-21

Abstract: The increase of interleukin-10 (IL-10) is one of the hallmarks during foot-and-mouth disease virus (FMDV) infection. The aim of this study was to investigate the effects of IL-10 on the proliferation and the expressions of function-related cytokines of T cells in peripheral blood of mice infected with FMDV. The proliferation and the expressions of effector function-related cytokines (TNF-α, IFN-γ and IL-2) of T cells in peripheral blood of mice were detected by CCK-8 and flow cytometry, respectively. The results showed that the proliferations of T cells in peripheral blood of FMDV-infected mice at 12, 24, 36 and 48 hpi were significantly decreased compared with that of mock-mice (P<0.05 or P<0.01); and the expressions of TNF-α and IL-2 of CD4+ T cells in peripheral blood of infected mice were significantly decreased compared with that of mock-mice (all P<0.01); and the expressions of TNF-α, IFN-γ and IL-2 of CD8+ T cells in peripheral blood of infected mice were also significantly decreased compared with that of mock-mice (P<0.01 or P<0.000 1). However, blocking IL-10/IL-10R signaling in vivo or knocking out IL-10 contributed to restore the proliferation of T cells in peripheral blood following FMDV infection (P<0.05 or P<0.01), but did not affect the expressions of TNF-α, IFN-γ and IL-2 of CD4+ and CD8+ T cells. The study for the first time revealed that the proliferation and the expressions of TNF-α, IFN-γ and IL-2 of T cells were inhibited after FMDV infection, which contributed to evade immune responses. Although blocking IL-10/IL-10R signaling in vivo or knocking out IL-10 did not affect the expressions of TNF-α, IFN-γ and IL-2 of CD4+ and CD8+ T cells, it contributed to restore the proliferation of T cells in peripheral blood of FMDV-infected mice, providing new perspectives and new strategies for the design of new products for FMD prevention and control.

Key words: foot-and-mouth disease virus, interleukin-10, T cells, proliferation, cytokine

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