Hepatology International

, Volume 2, Issue 1, pp 3–16 | Cite as

Immune selection during chronic hepadnavirus infection

  • William S. Mason
  • Sam Litwin
  • Allison R. Jilbert
Review Article

Abstract

Purpose

Late-stage outcomes of chronic hepatitis B virus (HBV) infection, including fibrosis, cirrhosis, and hepatocellular carcinoma (HCC) result from persistent liver injury mediated by HBV antigen specific cytotoxic T lymphocytes (CTLs). Two other outcomes that often accompany chronic infection, the emergence of mutant viruses, including HBe-antigen negative (HBeAg (−)) HBV, and a reduction over time in the fraction of hepatocytes productively infected with HBV, may also result from persistent immune attack by antiviral CTLs. To gain insights into how these latter changes take place, we employed computer simulations of the chronically infected liver.

Methods

Computational programs were used to model the emergence of both virus-free hepatocytes and mutant strains of HBV.

Results

The computer modeling predicted that if cell-to-cell spread of virus is an efficient process during chronic infections, an HBV mutant that replicated significantly more efficiently than the wild type would emerge as the prevalent virus in a few years, much more rapidly than observed, while a mutant that replicated with the same or lower efficiency would fail to emerge. Thus, either cell-to-cell spread is inefficient or mutants do not replicate appreciably more efficiently than wild type. In contrast, with immune selection and a higher rate of killing of hepatocytes infected with wild-type virus, emergence of mutant virus can be explained without the need for a higher replication rate. Immune selection could also explain the emergence of virus-free hepatocytes that are unable to support HBV infection, since they should have a lower turnover rate than infected hepatocytes.

Keywords

Chronic hepatitis B Immune selection  HBeAg (−) HBV Hepatocyte clones 

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Copyright information

© Asian Pacific Association for the Study of the Liver 2007

Authors and Affiliations

  • William S. Mason
    • 1
  • Sam Litwin
    • 1
  • Allison R. Jilbert
    • 2
    • 3
  1. 1.Fox Chase Cancer CenterPhiladelphiaUSA
  2. 2.Infectious Diseases LaboratoriesInstitute of Medical and Veterinary ScienceAdelaideAustralia
  3. 3.School of Molecular and Biomedical ScienceUniversity of AdelaideAdelaideAustralia

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