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Liver-specific expression of interferon gamma following adenoviral gene transfer controls hepatitis B virus

J Dumortier1, K Schönig, H Oberwinkler

  • 1Department of Virology, University of Heidelberg, Heidelberg, Germany.

Gene Therapy
|January 14, 2005
PubMed

Insights

This study developed a liver-specific gene therapy system using Tet-On technology to control interferon gamma expression in mice with chronic hepatitis B virus (HBV) infection. The system effectively reduced HBV replication in vivo.

Area of Science:

  • Gene therapy
  • Immunology
  • Hepatology

Background:

  • Systemic interferon therapy for viral infections and cancer has limitations due to adverse effects.
  • Tissue-specific gene expression is a promising alternative for localized therapeutic benefits.
  • Liver-directed gene therapy is being explored for chronic viral hepatitis and hepatocellular carcinoma.

Purpose of the Study:

  • To develop and evaluate a liver-specific, regulated gene expression system for interferon gamma in a mouse model of chronic hepatitis B virus (HBV) infection.
  • To assess the efficacy of doxycycline-inducible interferon gamma expression in controlling HBV replication.
  • To establish a tool for studying local cytokine effects in disease models.

Main Methods:

  • Utilized adenoviral vectors with a Tet-On system for regulated gene expression.
  • Coexpressed firefly luciferase and interferons (alpha, beta, gamma) under a bidirectional tetracycline-regulated promoter.
  • Employed liver-specific promoters for the reverse tetracycline-controlled transactivator in HBV transgenic mice.
  • Administered doxycycline to induce gene expression and monitored HBV replication.

Main Results:

  • Achieved low background, tightly regulated, and over 1000-fold induction of gene expression with doxycycline.
  • Demonstrated simultaneous and liver-specific expression of coexpressed genes in vitro and in vivo.
  • Doxycycline-induced interferon gamma expression significantly controlled HBV replication in mice.
  • HBV transcripts were not eliminated by the treatment.

Conclusions:

  • The developed Tet-On system enables precise, liver-specific, and inducible expression of therapeutic genes like interferon gamma.
  • This system effectively reduces viral replication in a relevant disease model.
  • It provides a valuable platform for further research into localized cytokine therapy and disease mechanisms.

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