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Yong Xu1, Zehua Wang1, Xianhong Du1

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Blocking Tim-3 (T cell immunoglobulin and mucin domain-3) enhances invariant natural killer T (iNKT) cell activity. This approach shows promise for inhibiting hepatitis B virus (HBV) replication.

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Area of Science:

  • Immunology
  • Hepatology
  • Virology

Background:

  • T cell immunoglobulin and mucin domain-3 (Tim-3) expression is elevated on invariant natural killer T (iNKT) cells during chronic hepatitis B virus (HBV) infection.
  • The regulatory role of Tim-3 on iNKT cells in the context of chronic HBV remains to be fully elucidated.

Purpose of the Study:

  • To investigate the function of Tim-3 in regulating iNKT cells during chronic HBV infection.
  • To evaluate the therapeutic potential of Tim-3 blockade in combination with α-galactosylceramide (α-Galcer) for HBV treatment.

Main Methods:

  • Analysis of Tim-3 expression on hepatic iNKT cells in HBV-transgenic mice and in vitro stimulated iNKT cells.
  • Assessment of cytokine production (IFN-γ, IL-4, TNF-α) and degranulation marker (CD107a) in Tim-3 positive/negative iNKT cells.
  • In vivo and in vitro experiments using Tim-3 blocking antibodies and Tim-3 knockout mice to study iNKT cell function and HBV replication.

Main Results:

  • Tim-3 expression was upregulated on hepatic iNKT cells in HBV models.
  • Tim-3+ iNKT cells exhibited enhanced effector functions (IFN-γ, IL-4, CD107a production).
  • Tim-3 blockade significantly boosted iNKT cell activation and promoted α-Galcer-mediated inhibition of HBV replication, evidenced by reduced HBV DNA, HBsAg, and pgRNA levels.

Conclusions:

  • Tim-3 negatively regulates iNKT cell activity in the context of chronic HBV infection.
  • Tim-3 blockade enhances iNKT cell-mediated antiviral responses against HBV.
  • Combination therapy of α-Galcer with Tim-3 blockade represents a potential novel strategy for treating chronic hepatitis B.