Related Experiment Videos
Characteristics of the early phase of chronicity in acute hepatitis B infection
R A Heijtink1, W Paulij, M van Roosmalen
1Department of Virology, Erasmus University Rotterdam, The Netherlands. heijtink@viro.fgg.eur.nl
Insights
Chronic hepatitis B (HBV) may develop due to interrupted immune clearance. Analyzing antibody responses to hepatitis B e-antigen (HBeAg) could identify patients at risk for early intervention.
Area of Science:
- Hepatology
- Virology
- Immunology
Background:
- The progression from acute to chronic hepatitis B virus (HBV) infection remains incompletely understood.
- Identifying factors predicting chronicity is crucial for timely therapeutic interventions.
Purpose of the Study:
- To investigate the immunological and virological characteristics differentiating acute HBV infection that resolves from that which becomes chronic.
- To explore the potential of specific antibody responses in predicting the development of chronic HBV.
Main Methods:
- Comparative analysis of viral and antibody profiles in patients who developed chronic HBV versus those with resolving infection after a single-source outbreak.
- Base sequence analysis of S- and C-gene regions of HBV.
- Sandwich enzyme immunoassay using a specific monoclonal antibody (HBOT.95A) to detect HBeAg signal variations.
Main Results:
- No genotypic or sequence differences were found in the S- and C-genes between chronic and resolving HBV infections.
- Patients who developed chronic HBV showed a transient reduction in HBsAg, HBeAg, and HBV DNA levels around 14-20 weeks post-infection.
- A specific HBeAg monoclonal antibody (HBOT.95A) detected altered HBeAg signals in patients who developed chronicity, suggesting immune evasion.
Conclusions:
- Chronic hepatitis B appears to result from an interruption in the immune clearance process.
- Assessing antibody responses to HBeAg may identify individuals at higher risk of developing chronic HBV infection.
- Early identification of at-risk patients could enable timely intervention therapies.
Abstract:
The mechanism of development of chronicity after acute hepatitis B infection has not been elucidated fully. Following a single source outbreak of hepatitis B among 79 adult women, three patients (4%) became chronic carriers of hepatitis B virus (HBV). We compared features of the virus and antibody response of the latter three patients with those of 12 HBeAg-positive cases with resolving infection. The virus genotype was D, antigenic subtype ayw2. Base sequence analysis of S- and C-gene regions revealed no differences between the two groups. During the acute illness the three patients who developed chronicity had a remarkable transient reduction of HBsAg, HBeAg, and HBV DNA levels at 14-20 weeks after infection, the time of HBeAg seroconversion in the patients who cleared the infection. One HBeAg-specific monoclonal antibody (HBOT.95A) used as solid-phase antibody in a sandwich enzyme immunoassay detected an increased HBeAg signal in 2 of the 3 patients that developed chronicity and in 1 of the 12 patients who recovered. The latter patient had an exceptional long period of HBsAg antigenemia. Standard HBeAg assays detected HBeAg in all cases. HBeAg and anti-HBe-positive serum samples from the patients who recovered could inhibit the HBOT.95A response. The results suggest that chronic hepatitis B develops after an interruption of immune clearance. Differentiation of the antibody response to HBeAg may help to find patients with an increased risk for this interrupted immune clearance who might be candidates for an early intervention therapy.