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Related Experiment Videos

Lactic acid bacteria as live vaccines.

A Mercenier1, H Müller-Alouf, C Grangette

  • 1Department of Microbiology of Ecosystems, Institut Pasteur de Lille, France.

Current Issues in Molecular Biology
|July 24, 2001
PubMed
Summary

Lactic acid bacteria (LAB) show promise as live vaccine vectors for mucosal delivery, eliciting immune responses via nasal, oral, and vaginal routes in mice. Further research aims to enhance vaccine efficacy and safety.

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Area of Science:

  • Vaccinology
  • Microbiology
  • Immunology

Background:

  • Mucosal vaccine delivery offers advantages over systemic routes.
  • Live bacterial vectors are a key strategy for mucosal antigen delivery.
  • Non-pathogenic lactic acid bacteria (LAB) are emerging as safe alternatives to attenuated pathogens for vaccine development.

Purpose of the Study:

  • To compare the vaccine potential of Lactococcus lactis, Streptococcus gordonii, and Lactobacillus spp. as live antigen carriers.
  • To evaluate the efficacy of LAB-based mucosal vaccines in eliciting systemic and mucosal immune responses.
  • To explore strategies for potentiating immune responses, such as co-expression of interleukins.

Main Methods:

  • Utilizing three LAB systems (Lactococcus lactis, Streptococcus gordonii, Lactobacillus spp.) as live bacterial vectors.
  • Administering vaccines via nasal, oral, and vaginal routes in mouse models.
  • Assessing antigen-specific immune responses at both systemic and mucosal levels.

Main Results:

  • All three LAB systems successfully elicited antigen-specific immune responses in mice via the nasal route.
  • Evidence suggests successful oral immunization with L. lactis and vaginal immunization with S. gordonii.
  • Co-expression of interleukins was shown to potentiate the elicited immune responses.

Conclusions:

  • Lactic acid bacteria are effective live vectors for mucosal vaccine delivery, inducing significant immune responses.
  • LABVAC network's findings support the use of LAB for developing safe and effective mucosal vaccines.
  • Future research will focus on improving immunization efficiency, in vivo antigen production, Lactobacillus colonization, and creating contained strains.

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