| Autor: |
Beiying Wu, Qian Shen, Huaizhou Wang, Liang Hu, Gang Cai, Lei Li, Cen Jiang, Jiafei Lin |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Cellular Immunology. 311:36-45 |
| ISSN: |
0008-8749 |
| DOI: |
10.1016/j.cellimm.2016.10.002 |
| Popis: |
Similar to programmed death-1 (PD-1), B and T lymphocyte attenuator (BTLA) is a co-inhibitory molecule of the CD28 family. PD-1 is involved in T cell exhaustion during chronic viral infection. However, the role of BTLA in virus-specific T cells is poorly defined. Here we investigated the expression and function of BTLA in T cells from patients with chronic hepatitis B virus (HBV) infection. The phenotype of peripheral and intrahepatic HBV-specific T cells from 43 patients with chronic HBV infection was assessed by flow cytometry. Functional evaluation was analyzed by T cell expansion and cytokine secretion after different treatments. In chronic HBV patients, a subset of inefficient interferon-γ producing antigen-specific CD8+ T cells recruited to the liver expressed high BTLA levels. The BTLA+ HBV-specific CD8+ T cell suppressive function was antigen-specific, at least in the induction phase, because they were only activated by a pool of HBV peptides but not with a pool of unrelated peptides. Suppression of T cell responses was restored by a BTLA signaling blockade and neutralizing IL-10, indicating that BTLA signaling-mediated IL-10 secretion plays a key role in suppression. This study provides important evidence that there is a subset of liver infiltrated virus-specific CD8+BTLA+ regulatory T cells in patients with chronic HBV infection. This subset of cells plays a pivotal role in controlling hepatic effector CD8+ T cell responses through BTLA signaling mediated regulatory factor IL-10 production. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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