GMMA Is a Versatile Platform to Design Effective Multivalent Combination Vaccines

Area of Science:

• Vaccinology and Immunology
• Biotechnology and Microbial Engineering

Background:

• High-burden diseases and antimicrobial resistance necessitate innovative vaccine development platforms.
• Generalized Modules for Membrane Antigens (GMMA), derived from engineered Gram-negative bacteria, offer a promising strategy for affordable vaccine design.

Purpose of the Study:

• To evaluate the immunogenicity of GMMA decorated with heterologous polysaccharide or protein antigens.
• To compare the efficacy of GMMA-based vaccines with traditional vaccine formulations.

Main Methods:

• Engineering Gram-negative bacteria to produce Generalized Modules for Membrane Antigens (GMMA).
• Decorating GMMA with diverse polysaccharide or protein antigens.
• Assessing antigen-specific humoral immune responses and immunogenicity in murine models.

Main Results:

• GMMA decorated with heterologous antigens elicited a strong and effective antigen-specific humoral immune response in mice.
• GMMA demonstrated enhanced immunogenicity compared to traditional vaccine formulations like recombinant proteins and glycoconjugates.
• No negative impact on the anti-GMMA immune response was observed.

Conclusions:

• Generalized Modules for Membrane Antigens (GMMA) represent a potent and versatile vaccine technology platform.
• GMMA facilitate the development of effective combination vaccines against multiple pathogens simultaneously.
• This 'plug and play' approach holds significant potential for addressing global health challenges, particularly in low- and middle-income countries.