Immunospecific responses to bacterial elongation factor Tu during Burkholderia infection and immunization

Area of Science:

• Microbiology
• Immunology
• Vaccinology

Background:

• Melioidosis, caused by Burkholderia pseudomallei, is a significant infectious disease in Southeast Asia and Northern Australia.
• There is currently no licensed vaccine available to prevent melioidosis, highlighting an urgent need for vaccine development against this biological threat agent.

Purpose of the Study:

• To identify potential vaccine antigens for Burkholderia infections using an immunoproteomic approach.
• To evaluate the immunogenicity and efficacy of Elongation factor-Tu (EF-Tu) as a vaccine candidate against melioidosis.

Main Methods:

• An immunoproteomic strategy was utilized to screen for potential vaccine targets.
• Mice were immunized with EF-Tu, and antigen-specific antibody and cell-mediated immune responses were assessed.
• The efficacy of mucosal immunization with EF-Tu was evaluated in a murine model challenged with aerosolized B. thailandensis.

Main Results:

• Bacterial Elongation factor-Tu (EF-Tu) was identified as a potential vaccine antigen.
• EF-Tu is associated with the bacterial membrane, secreted in outer membrane vesicles (OMVs), and elicits an immune response during infection.
• Active and mucosal immunization with EF-Tu successfully induced antigen-specific immune responses and reduced bacterial lung burden in mice.

Conclusions:

• Elongation factor-Tu (EF-Tu) is a viable vaccine immunogen for combating bacterial infections.
• The findings support the development of EF-Tu-based vaccines against melioidosis and potentially other Burkholderia-related diseases.