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Lymphocyte activation gene 3 negatively regulates the function of intrahepatic hepatitis C virus-specific CD8+ T

Na Chen1, Yehong Liu1, Yonghong Guo2

  • 1Department of Infectious Diseases, First Affiliated Hospital, Medical College of Xi'an Jiaotong University, Xi'an, China.

Journal of Gastroenterology and Hepatology
|June 23, 2015
PubMed

Insights

Lymphocyte activation gene 3 (LAG-3) negatively impacts Hepatitis C Virus (HCV)-specific CD8(+) T cell function in chronic Hepatitis C (CHC) patients. Blocking LAG-3 enhances T cell proliferation, cytokine production, and cytotoxicity, offering potential therapeutic targets.

Area of Science:

  • Immunology
  • Virology
  • Cellular Biology

Background:

  • Chronic hepatitis C (CHC) is a global health issue driven by persistent Hepatitis C Virus (HCV) infection.
  • Functional exhaustion of HCV-specific CD8(+) T cells, influenced by inhibitory receptors, contributes to CHC.
  • The role of Lymphocyte Activation Gene 3 (LAG-3) in HCV-specific CD8(+) T cell function remains unclear.

Purpose of the Study:

  • To investigate the role of LAG-3 in regulating HCV-specific CD8(+) T cell function in CHC patients.
  • To determine if LAG-3 expression affects T cell proliferation, cytokine production, and cytotoxicity.

Main Methods:

  • Flow cytometry was used to analyze LAG-3 expression on CD8(+) T cells from CHC patients and controls.
  • LAG-3 expression was modulated using lentivirus shRNA or overexpression vectors.
  • T cell proliferation, cytokine production (IFN-γ, TNF-α, granzyme B, perforin), and cytotoxicity were assessed after HCV peptide stimulation.

Main Results:

  • LAG-3 was expressed at higher frequencies on intrahepatic and peripheral CD8(+) T cells in CHC patients.
  • Downregulating or blocking LAG-3 increased proliferation, cytokine production, and cytotoxicity of HCV-specific CD8(+) T cells.
  • Overexpressing LAG-3 inhibited these functions, an effect reversed by LAG-3 blockade.

Conclusions:

  • LAG-3 negatively regulates the function of HCV-specific CD8(+) T cells in the context of chronic Hepatitis C.
  • Targeting LAG-3 may represent a therapeutic strategy to restore anti-HCV T cell immunity.
Abstract

Keywords:
CD8+ T cellsHCVLAG-3.immunology

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