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A Primary Neuron Culture System for the Study of Herpes Simplex Virus Latency and Reactivation
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Herpes Simplex Viruses Whose Replication Can Be Deliberately Controlled as Candidate Vaccines.

Richard Voellmy1, David C Bloom2, Nuria Vilaboa3,4

  • 1HSF Pharmaceuticals SA, 1814 La Tour-de-Peilz, Switzerland.

Vaccines
|May 24, 2020
PubMed
Summary

Novel replication-competent controlled viruses (RCCVs) offer enhanced immunization by replicating only when activated. Activated RCCVs demonstrated superior immunogenicity and protective responses against themselves and heterologous antigens in mouse models.

Keywords:
HSV-1candidate vaccineherpesviruslive vaccinereplication-competent controlledvaccine vector

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Area of Science:

  • Virology
  • Immunology
  • Vaccine Development

Background:

  • Traditional vaccine approaches rely on virus attenuation or inactivation.
  • Replicating viruses generally elicit stronger immune responses than non-replicating ones.
  • A novel controlled replication strategy offers a potential alternative for enhanced vaccine efficacy.

Purpose of the Study:

  • To evaluate a novel immunization paradigm using replication-competent controlled viruses (RCCVs).
  • To assess the immunogenicity and protective efficacy of activated RCCVs.
  • To explore the potential of RCCVs for developing vaccines against viral diseases.

Main Methods:

  • Construction of RCCVs using a wild-type HSV-1 backbone with controlled replication genetic mechanisms.
  • Activation of RCCVs via localized heat treatment and a small-molecule regulator (SMR).
  • Immunization and challenge experiments in mouse models using activated and unactivated RCCVs, including those expressing heterologous antigens.

Main Results:

  • Activated RCCVs replicated efficiently at the inoculation site upon activation.
  • Activated RCCVs induced significantly stronger protective immune responses compared to unactivated RCCVs or replication-defective strains.
  • Robust neutralizing antibody and proliferation responses were observed in mice immunized with activated RCCVs.

Conclusions:

  • RCCVs represent a promising platform for developing potent vaccines.
  • Controlled viral replication enhances immunogenicity and protective immunity.
  • Further research is warranted to develop RCCV-based vaccines for herpetic and other infectious diseases.