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Related Experiment Videos

Liver-targeted gene therapy by SV40-based vectors using the hydrodynamic injection method.

Uri Arad1, Evelyn Zeira, Mahmoud Abd El-Latif

  • 1Department of Hematology, Hebrew University-Hadassah Medical School and Hadassah Hospital, Jerusalem 91120, Israel.

Human Gene Therapy
|April 7, 2005
PubMed
Summary

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Simian virus 40 (SV40) vectors efficiently deliver genes to liver cells for potential gene therapy. These vectors demonstrated long-term transgene expression in hepatocytes with minimal immune response in mice.

Area of Science:

  • * Molecular Biology
  • * Gene Therapy
  • * Virology

Background:

  • * Gene therapy offers potential for treating liver and systemic diseases by correcting defective genes in hepatocytes.
  • * Simian virus 40 (SV40)-based vectors are being explored for their efficacy in liver gene therapy applications.

Purpose of the Study:

  • * To evaluate the potential of SV40-based vectors for efficient gene delivery and long-term transgene expression in hepatocytes.
  • * To assess the safety and immunogenicity of SV40 vectors in vivo for liver gene therapy.

Main Methods:

  • * Construction of an SV40 T-antigen replacement transduction vector (SV/luc) propagated on supporting cell lines.
  • * Intravenous administration of SV/luc vectors into BALB/C mice via tail vein injection.
  • * In vivo monitoring of luciferase gene expression using a cooled charged-coupled device (CCCD) camera.

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Main Results:

  • * SV40 vectors demonstrated efficient gene delivery to hepatocytes, achieving sustained transgene expression for over 107 days.
  • * Optimal vector doses ranged from 3 x 10^6 to 3 x 10^7 transducing units.
  • * Hydrodynamic delivery induced transient liver inflammation, with complete recovery; low levels of neutralizing antibodies were detected, but no cellular immune responses.
  • * In vitro-packaged vectors using recombinant capsid proteins also showed effectiveness in liver transduction.

Conclusions:

  • * SV40-based vectors are effective for gene delivery to hepatocytes, supporting long-term transgene expression.
  • * The safety profile appears favorable, with transient inflammation and minimal immunogenicity, suggesting potential utility in liver gene therapy.