Lymphocytes forming stable E-rosettes in acute and chronic hepatitis.

Area of Science:

• Immunology
• Hepatology
• Virology

Background:

• Hepatitis B virus (HBV) infection can lead to acute and chronic liver disease.
• Specific lymphocyte subpopulations may play a role in the immune response to HBV.
• E-rosette forming lymphocytes (ERFs) are a subset of T-lymphocytes with potential immunoregulatory functions.

Purpose of the Study:

• To investigate the presence and characteristics of E-rosette forming lymphocytes in patients with different forms of hepatitis B.
• To determine if ERFs correlate with specific hepatitis B virus (HBV) antigens or disease activity.

Main Methods:

• Peripheral blood lymphocytes were isolated from patients with acute hepatitis B, HBsAg-negative active chronic hepatitis, and HBsAg-positive active chronic hepatitis.
• E-rosette formation with sheep erythrocytes was assessed.
• Lymphocyte adherence to nylon wool and Fc-gamma-G (FcIgG) receptor expression were evaluated.

Main Results:

• Elevated numbers of E-rosette forming lymphocytes were observed in patients with acute hepatitis B (6-20%) and HBsAg-negative active chronic hepatitis (9-28%).
• No significant increase in ERFs was found in patients with HBsAg-positive active chronic hepatitis.
• These ERFs exhibited properties consistent with a T-lymphocyte subpopulation, including nylon wool adherence and FcIgG receptor expression.

Conclusions:

• A specific subpopulation of T-lymphocytes with suppressor function, identified by E-rosette formation, is increased in acute hepatitis B and HBsAg-negative chronic hepatitis.
• The absence of this increase in HBsAg-positive chronic hepatitis suggests a differential immune response based on viral antigen status.