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Bacterial ghosts: non-living candidate vaccines
M P Szostak1, A Hensel, F O Eko
1Institute of Microbiology and Genetics, University of Vienna, Austria.
Journal of Biotechnology
|January 26, 1996
Summary
Bacterial ghosts produced using PhiX174 gene E offer a novel, non-living vaccine platform. These recombinant ghosts effectively present foreign antigens, eliciting strong immune responses and showing potential for mucosal vaccination.
Area of Science:
- Microbiology
- Immunology
- Biotechnology
Background:
- PhiX174 gene E induces bacterial lysis, creating intact bacterial ghosts.
- Gram-negative bacteria lysis via gene E forms transmembrane tunnels, preserving envelope structures.
- Bacterial ghosts are proposed as non-living vaccines, an alternative to inactivated pathogens.
Purpose of the Study:
- To evaluate bacterial ghosts as a novel vaccine delivery system.
- To investigate the immunogenicity of recombinant bacterial ghosts displaying foreign antigens.
- To explore the potential of bacterial ghosts for mucosal vaccination.
Main Methods:
- Expression of PhiX174 gene E in various Gram-negative bacteria to produce bacterial ghosts.
- Insertion of foreign proteins into the bacterial inner membrane of recombinant ghosts using anchor sequences.
- Administration of recombinant ghosts to experimental animals via parenteral and aerosol routes.
Main Results:
- E-mediated lysis yielded intact bacterial ghosts from diverse Gram-negative species.
- Recombinant ghosts successfully presented foreign antigens, inducing specific humoral and cellular immunity.
- Aerosol vaccination with recombinant ghosts in swine demonstrated protective immunity and mucosal immune targeting.
Conclusions:
- Bacterial ghosts are a versatile, non-living vaccine platform with advantages over traditional methods.
- Recombinant ghosts offer a stable, cost-effective method for presenting multiple antigens.
- E-mediated lysis provides a method for producing immunogens that can stimulate mucosal immunity.