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Inhibition of hepatitis C virus RNA replicons by peptide aptamers

Alla Trahtenherts1, Meital Gal-Tanamy, Romy Zemel

  • 1Department of Molecular Microbiology and Biotechnology, The George S. Wise Faculty of Life Sciences, Green Building, Tel-Aviv University, 69978 Ramat Aviv, Israel.

Antiviral Research
|February 5, 2008
PubMed
Abstract

Insights

Novel peptide aptamers were developed to inhibit Hepatitis C virus (HCV) NS3 protease activity. These aptamers show promise for a new antiviral strategy against HCV replication.

Area of Science:

  • Virology
  • Molecular Biology
  • Drug Discovery

Background:

  • Hepatitis C virus (HCV) infection is a significant global health concern.
  • The viral NS3 serine protease plays a critical role in HCV polyprotein processing and is implicated in malignant transformation.
  • Targeting NS3 protease activity is a key strategy for developing antiviral drugs against HCV.

Purpose of the Study:

  • To isolate peptide aptamers that inhibit the NS3 protease activity of Hepatitis C virus.
  • To evaluate the efficacy of these peptide aptamers in inhibiting HCV replication.

Main Methods:

  • A novel bacterial genetic screen was employed to isolate NS3-inhibiting peptide aptamers.
  • Seven NS3-inhibiting peptide aptamers were isolated and characterized.
  • Phenotypic changes in SEAP-secreting subgenomic RNA replicons upon aptamer expression were assessed using real-time RT-PCR and SEAP secretion assays.

Main Results:

  • Isolated peptide aptamers demonstrated inhibition of NS3 protease activity in vitro, with IC50 values in the low micromolar range.
  • Intracellular expression of these aptamers via transfection inhibited the replication of SEAP-secreting genotype 1b subgenomic RNA replicons.
  • The study successfully identified and validated functional NS3-inhibiting peptide aptamers.

Conclusions:

  • Peptide aptamers effectively inhibit Hepatitis C virus NS3 protease activity and viral replication.
  • Aptamer-based intracellular immunization represents a potential novel antiviral approach for combating HCV.
  • Further development of aptamer therapeutics could offer a new avenue for treating HCV infection.

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