Tim-3 expression on peripheral T cell subsets correlates with disease progression in hepatitis B infection

Area of Science:

• Immunology
• Hepatology
• Virology

Background:

• T-cell immunoglobulin domain and mucin domain-containing molecule-3 (Tim-3) is a known mechanism of T-cell dysfunction in chronic viral diseases.
• The precise role of Tim-3 in the pathogenesis of chronic hepatitis B (CHB) remains unclear.
• Investigating Tim-3 expression in HBV infection is crucial for understanding disease progression.

Purpose of the Study:

• To investigate Tim-3 expression on peripheral T cell subsets in patients with hepatitis B virus (HBV) infection.
• To analyze the relationship between Tim-3 expression and disease progression in CHB.
• To evaluate Tim-3 expression in relation to liver injury markers and treatment response.

Main Methods:

• Peripheral blood samples were collected from CHB patients (moderate and severe), acute hepatitis B (AHB) patients, and healthy controls.
• Flow cytometry was used to determine Tim-3 expression on T cell subsets (CD4+ and CD8+).
• Correlation analysis was performed between Tim-3 expression, liver injury markers (ALT, AST, TB, INR), T-bet mRNA, and interferon-gamma levels.

Main Results:

• Tim-3 expression was significantly elevated on peripheral CD4+ and CD8+ T cells in both AHB and CHB patients compared to healthy controls.
• Tim-3 expression increased with disease severity in CHB and positively correlated with liver injury markers.
• Tim-3 expression negatively correlated with T-bet mRNA and interferon-gamma, and decreased in patients with disease remission or during AHB convalescence.

Conclusions:

• Over-expression of Tim-3 is implicated in the progression of CHB.
• Tim-3 may contribute to the persistence of HBV infection by skewing Th1/Tc1 responses.
• Tim-3 expression serves as a potential biomarker for disease activity and treatment response in HBV infection.