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Volume 37 Issue 5
May  2021
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Article Navigation >  Journal of Clinical Hepatology  > 2021  >  37(5): 1059-1064

Mechanism of gamma-chain cytokines in regulating the expression of T-cell immunoglobulin and mucin domain-containing molecule 3 in CD8+ T cells of chronic hepatitis B patients

DOI: 10.3969/j.issn.1001-5256.2021.05.017

  • Department of Infectious Diseases, The Second Affiliated Hospital of Air Force Medcial University(Tangdu Hospital, Fourth Military Medical University), Xi'an 710038, China

  • Received Date: 2020-10-27
  • Accepted Date: 2020-11-20
  • Published Date: 2021-05-20
    Abstract
  •   Objective  To investigate the mechanism of gamma-chain (γC) cytokines in regulating the expression of T-cell immunoglobulin and mucin domain-containing molecule 3 (TIM-3) in CD8+ T cells of chronic hepatitis B (CHB) patients.  Methods  A total of 23 CHB patients who attended Tangdu Hospital, Fourth Military Medical University, from January to May, 2017, were enrolled. Peripheral blood was collected from all patients, and Ficoll density gradient centrifugation was used to isolate peripheral blood mononuclear cells (PBMCs). PBMCs were stimulated with interleukin-7 (IL-7), interleukin-15 (IL-15), and interleukin-21, respectively, and then anti-γC antibody and/or anti-IL-7Rα, anti-IL-2Rβ, and anti-IL-21R were added to the culture solution. After 96 hours of culture, flow cytometry was used to measure the expression of TIM-3, interleukin-2 (IL-2), interleukin-10 (IL-10), and interferon-γ (IFNγ) and the phosphorylation level of signal transducer and activator of transcription (STAT) in CD8+ T cells. A one-way analysis of variance and the least significant difference t-test were used for comparison of continuous data.  Results  The CD8+ T cells stimulated by IL-7 and IL-15 had a significantly higher percentage of TIM-3-positive CD8+ T cells than those without stimulation (t=9.966 and 9.074, P < 0.05), as well as significantly higher expression levels of IL-2, IL-10, and IFN-γ and phosphorylation levels of STAT-5 and STAT-1 (all P < 0.05). Stimulation with anti-IL-7Rα and anti-γC antibody significantly reduced the elevated expression levels of TIM-3, IL-2, and IL-10 in the IL-7 stimulation group (t=5.537, 6.224, and 4.500, P < 0.05). Stimulation with anti-IL-2Rβ alone or in combination with anti-γC antibody significantly reduced the expression levels of TIM-3 and IL-2 and the phosphorylation level of STAT-1 in the IL-15 stimulation group (P < 0.05).  Conclusion  IL-7 and IL-15 can upregulate the expression of TIM-3 in CD8+ T cells of CHB patients, possibly via the γC receptor-mediated STAT-cytokine signaling pathway.

     

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