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Immune status and autoantibody formation in children with chronic hepatitis B infection
1Department of Pediatric Immunology and Pediatric Gastroenterology, Ege University Faculty of Medicine, Izmir, Turkey.
Insights
Chronic hepatitis B virus (HBV) infection is linked to altered immune responses, including increased IgG and T cells, and a higher prevalence of antinuclear antibodies (ANA). These immune changes may indicate a predisposition to autoimmune diseases, underscoring the need for careful patient monitoring.
Area of Science:
- Immunology
- Hepatology
- Virology
Background:
- Hepatitis B virus (HBV) infection can lead to chronic disease if a robust immune response is not mounted during the acute phase.
- Chronic HBV infection is associated with a range of liver conditions, from hepatitis to cirrhosis.
- Understanding immune dysregulation is crucial for managing chronic HBV.
Purpose of the Study:
- To investigate cellular and humoral immune parameters in patients with chronic HBV infection.
- To determine the prevalence of autoantibodies prior to immunomodulatory or antiviral therapy.
- To correlate immune profiles with the natural course of chronic HBV.
Main Methods:
- Comparative analysis of 44 chronic HBV patients and 20 healthy controls.
- Assessed serum immunoglobulins, IgG subclasses, secretory IgA, and complement components (C4).
- Analyzed lymphocyte subsets (CD3+, CD19+) and cell surface adhesion molecules (CD11a, CD18, CD54).
Main Results:
- Elevated IgG levels and decreased complement C4 were observed in HBV patients.
- Increased CD3+ (total T cells) and CD8+ lymphocytes, with a concurrent decrease in CD19+ B lymphocytes.
- 18.2% of patients tested positive for antinuclear antibodies (ANA).
Conclusions:
- ANA formation is a common finding in chronic HBV infection, potentially indicating autoimmune tendencies.
- Observed immunological abnormalities highlight the involvement of cellular and humoral immunity in HBV pathogenesis.
- Regular clinical follow-up is essential for patients with chronic HBV due to potential autoimmune links.
Background:
The hepatitis B virus (HBV) causes a wide spectrum of disease which ranges from acute hepatitis to liver cirrhosis. Patients who fail to mount a vigorous immune response in acute HBV develop chronic infection. Therefore, the aim of the study was to determine the cellular and humoral immune parameters of the patients with chronic HBV and to evaluate the prevalence of autoantibodies before the beginning of immunomodulator and antiviral therapy.
Methods:
In this comparative study, serum immunoglobulins, IgG subclasses, secretory IgA, serum complement components, lymphocyte subsets and CD11a, CD18, CD54 molecules on lymphocytes were determined in 44 hospitalized patients of chronic HBV infection and 20 cases of healthy control subjects.
Results:
Significant increase in IgG and significant decrease in the complement C4 were observed. The mean percentage of CD3+ lymphocytes, reflecting the percentage of total T cells was significantly higher in the patient group due to the increase of CD8+ lymphocytes. The mean percentage of CD19+ B lymphocytes was lower in the patient group secondary to the increase of their total T cells. No significant difference was found in cell surface adhesion molecules between patient and control groups. The percentage of antinuclear antibody positivity was 18.2%.
Conclusions:
Our data show that ANA formation is part of the natural course of chronic HBV infection and this value may reflect the tendency to autoimmune diseases and the importance of clinical follow-up. The abnormalities observed in immunological parameters may reflect the role of the cellular and humoral immune system in pathogenesis.