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B and T lymphocyte attenuator is highly expressed on intrahepatic T cells during chronic HBV infection and regulates their function

  • Original Article—Liver, Pancreas, and Biliary Tract
  • Published:
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Abstract

Background

T cell antiviral function is impaired during chronic hepatitis B (CHB). Programmed death-1 (PD-1) impairs antiviral T cell responses, but dysfunction is not always reversed by blockade of PD-1 pathway. Whether distinct T cell populations expressing different sets of inhibitory molecules exist has not been determined.

Methods

We studied the expression of the B and T lymphocyte attenuator (BTLA) on both peripheral blood mononuclear cells (PBMC) and intrahepatic lymphocytes, and the effects of blocking BTLA on circulating and intrahepatic T cells in CHB patients. Sixty-three CHB patients who underwent liver biopsy were enrolled. The expression of BTLA and PD-1 on PBMC and intrahepatic T cells was assessed by flow cytometry with antibodies to T cell differentiation molecules. Functional recovery was evaluated by analyzing production of interferon (IFN)-γ and interleukin (IL)-2 after incubation of T cells with anti-CD3 and irradiated mature dendritic cells in the presence of anti-BTLA, anti-PD-1, or both.

Results

Intrahepatic T cells expressed higher levels of BTLA than their peripheral counterparts. A significant fraction of intrahepatic T cells coexpressed BTLA and PD-1 and showed deep exhaustion of T cell responses. Blockade of the BTLA pathway enhanced both intrahepatic and PBMC T cell proliferation and cytokine secretion, and exhibited an additive effect upon blockage of PD-1.

Conclusions

Upregulation of inhibitory receptor BTLA restricts T cell responses in CHB. T cell exhaustion by high antigen concentrations exacerbates dysfunction of peripheral and intrahepatic T cells. Blockage of BTLA is a potential therapeutic approach for chronic HBV infection that may act by restoring antiviral T cell responses.

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Acknowledgments

This work was supported by grant 81001331 (to GC) from National Natural Science Foundation of China.

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The authors declare that they have no conflict of interest.

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Correspondence to Gang Cai or Qian Shen.

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Cai, G., Nie, X., Li, L. et al. B and T lymphocyte attenuator is highly expressed on intrahepatic T cells during chronic HBV infection and regulates their function. J Gastroenterol 48, 1362–1372 (2013). https://doi.org/10.1007/s00535-013-0762-9

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  • DOI: https://doi.org/10.1007/s00535-013-0762-9

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