Effector T cells immune reactivity among patients with acute hepatitis E

Area of Science:

• Immunology
• Virology
• Hepatology

Background:

• Hepatitis E virus (HEV) is a major cause of acute viral hepatitis globally.
• Limited data exists on cellular immune responses during acute HEV infection.

Purpose of the Study:

• To investigate T-cell subset changes in patients with acute HEV.
• To assess HEV-specific T-effector cell responses.

Main Methods:

• Flow cytometry was used to enumerate T-cell subsets in peripheral blood mononuclear cells (PBMCs).
• Interferon-gamma ELISPOT assays assessed HEV-specific T-cell responses to recombinant HEV proteins (ORF2, ORF3).
• Peptide mapping identified immunodominant regions within HEV proteins.

Main Results:

• Patients with acute HEV had higher counts of CD8(+) and CD4(+) CD8(+) cells compared to healthy controls.
• HEV-infected patients exhibited increased interferon-gamma production in response to HEV ORF2 and ORF3 proteins.
• Immunodominant regions for T-cell response were mapped to HEV ORF2 amino acids 181-249 and 301-489.

Conclusions:

• The study provides evidence of effector T-cell activation during acute Hepatitis E infection.
• These T-cell responses may contribute to viral clearance in HEV-infected individuals.