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Published on: September 25, 2019
Liver-Resident Memory CD8+ T Cells: Possible Roles in Chronic HBV Infection
Ji Won Han1,2, Eui-Cheol Shin1
1Laboratory of Immunology and Infectious Diseases, Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
Insights
Developing new treatments for chronic hepatitis B virus (HBV) infection is crucial. Targeting liver tissue-resident memory CD8+ T cells offers a promising immunotherapeutic strategy for durable viral clearance.
Area of Science:
- Immunology
- Hepatology
- Virology
Background:
- Chronic hepatitis B virus (HBV) infection presents challenges in achieving a functional cure or eliminating HBV covalently closed circular DNA (cccDNA).
- Improving HBV-specific adaptive immune responses is vital for sustained viral clearance alongside novel antiviral therapies.
- Tissue-resident memory CD8+ T (TRM) cells are a distinct immune cell population residing in tissues, including the liver, with unique characteristics.
Purpose of the Study:
- To review the characteristics of liver TRM cells.
- To explore the implications of liver TRM cells in the context of chronic HBV infection.
- To highlight liver TRM cells as a potential immunotherapeutic target.
Main Methods:
- Literature review focusing on TRM cell biology.
- Analysis of studies investigating TRM cells in mouse and human liver tissues.
- Synthesis of information on the role of liver TRM cells in chronic HBV infection.
Main Results:
- Liver TRM cells exhibit distinct properties compared to circulating T cells, influenced by the hepatic microenvironment.
- These cells play a significant role in immune surveillance and response within the liver.
- Their characteristics suggest a potential for therapeutic manipulation in chronic HBV.
Conclusions:
- Liver TRM cells possess unique features relevant to chronic HBV infection.
- Targeting liver TRM cells represents a promising immunotherapeutic avenue for achieving durable viral clearance.
- Further research into liver TRM cell function could lead to novel treatment strategies for chronic hepatitis B.
Abstract:
Achieving a functional cure for chronic hepatitis B virus (HBV) infection or complete elimination of HBV covalently closed circular DNA (cccDNA) has been challenging in the treatment of patients with chronic HBV infection. Although novel antivirals are being investigated, improving HBV-specific adaptive immune responses is also important for durable viral clearance. Tissue-resident memory CD8+ T (TRM) cells were recently reported as a T-cell population that resides in peripheral tissues and does not recirculate. TRM cells have been studied in the livers of mice and humans. Liver TRM cells have distinct characteristics compared to T cells in peripheral blood or other tissues, which may be associated with the unique microenvironment of the liver. In this review, we describe the characteristics of liver TRM cells and their implications in chronic HBV infection. We emphasize that liver TRM cells can be an immunotherapeutic target for the treatment of chronic HBV infection.
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