Circulating CD4+ CD25+ regulatory T cells correlate with chronic hepatitis B infection.
Immunology
; 123(1): 57-65, 2008 Jan.
Article
in En
| MEDLINE
| ID: mdl-17764450
ABSTRACT
Circulating CD4+ CD25+ regulatory T cells (Tregs) have been demonstrated to maintain immunotolerance and suppress the antigen-specific or antigen-non-specific T-cell responses, but their role in chronic hepatitis B (CHB) infection in humans has not been well characterized. In this study, we analysed the frequency and phenotypic characteristics of CD4+ CD25+ Tregs in patients of different hepatitis B virus (HBV) infection status, and investigated the effect of Tregs on antiviral immune responses in CHB patients, and the mechanism of this effect. A total of 137 subjects, including 79 CHB patients, 26 asymptomatic HBV carriers (ASCs), 12 acute hepatitis B (AHB) patients and 20 healthy controls, were enrolled in the study. We found that the frequency of CD4+ CD25(high) Tregs in AHB patients was comparable to that in healthy controls, while it was significantly increased in CHB patients. CD4+ CD25+ Tregs produced interleukin (IL)-10 but little or no interferon (IFN)-gamma under anti-CD3 stimulation. In CHB patients, the frequency of CD4+ CD25(high) Tregs positively correlated with serum viral load, and the Tregs were capable of suppressing the proliferation and IFN-gamma production of autologous peripheral blood mononuclear cells (PBMC) mediated by HBV antigen stimulation in vitro. However, combined administration of anti-programmed death-1 (PD-1) and anti-cytotoxic lymphocyte antigen-4 (CTLA-4) monoclonal antibody slightly enhanced the cellular proliferation and significantly increased the IFN-gamma production of PBMC cocultured with Tregs at a ratio of 21. Thus, the frequency of circulating CD4+ CD25+ Tregs is increased in patients with CHB, and this may play an important role in viral persistence by modulating virus-specific immune responses.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
T-Lymphocytes, Regulatory
/
Hepatitis B, Chronic
Limits:
Adult
/
Female
/
Humans
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Male
/
Middle aged
Language:
En
Journal:
Immunology
Year:
2008
Document type:
Article
Affiliation country:
China