Nucleic acid polymers prevent the establishment of duck hepatitis B virus infection in vivo

Antimicrob Agents Chemother. 2013 Nov;57(11):5299-306. doi: 10.1128/AAC.01005-13. Epub 2013 Aug 12.


Nucleic acid polymers (NAPs) are novel, broad-spectrum antiviral compounds that use the sequence-independent properties of phosphorothioate oligonucleotides (PS-ONs) as amphipathic polymers to block amphipathic interactions involved in viral entry. Using the duck hepatitis B virus (DHBV) model of human hepatitis B virus infection, NAPs have been shown to have both entry and postentry antiviral activity against DHBV infection in vitro in primary duck hepatocytes (PDH). In the current study, various NAPs were assessed for their prophylactic activity in vivo against DHBV infection in ducks. The degenerate NAP REP 2006 prevented the development of widespread and persistent DHBV infection in 14-day-old ducks, while the acidic-pH-sensitive NAP REP 2031 had little or no prophylactic effect. REP 2006 displayed significant toxicity in ducks, which was attributed to CpG-mediated proinflammation, while REP 2031 (which has no CpG motifs) displayed no toxicity. A third NAP, REP 2055, which was designed to retain amphipathic activity at acidic pH and contained no CpG motifs, was well tolerated and displayed prophylactic activity against DHBV infection at doses as low as 1 mg/kg of body weight/day. These studies suggest that NAPs can be easily and predictably tailored to retain anti-DHBV activity and to have minimal toxic effects in vivo. Future studies are planned to establish the therapeutic efficacy of NAPs against persistent DHBV infection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antiviral Agents / chemical synthesis
  • Antiviral Agents / pharmacology*
  • CpG Islands
  • Drug Administration Schedule
  • Hepadnaviridae Infections / drug therapy*
  • Hepadnaviridae Infections / virology
  • Hepatitis B Virus, Duck / drug effects*
  • Hepatitis B Virus, Duck / growth & development
  • Hepatitis, Viral, Animal / drug therapy*
  • Hepatitis, Viral, Animal / virology
  • Hydrophobic and Hydrophilic Interactions
  • Phosphorothioate Oligonucleotides / chemical synthesis
  • Phosphorothioate Oligonucleotides / pharmacology*
  • Structure-Activity Relationship
  • Virus Internalization / drug effects
  • Virus Replication / drug effects


  • Antiviral Agents
  • Phosphorothioate Oligonucleotides