Outer Membrane Vesicles as a Versatile Platform for Vaccine Development: Engineering Strategies, Applications and...

Area of Science:

• Microbiology
• Immunology
• Biotechnology

Background:

• Outer membrane vesicles (OMVs) are naturally secreted by Gram-negative bacteria.
• OMVs contain pathogen-associated molecular patterns (PAMPs), conferring immunostimulatory and self-adjuvanting properties.
• OMVs are a promising vaccine platform due to their safety, modularity, and potential for genetic engineering.

Purpose of the Study:

• To review the advantages of OMVs over traditional vaccines.
• To explore methods for enhancing OMV yield and immunogenicity.
• To summarize preclinical applications and future challenges of OMV-based vaccines.

Main Methods:

• Review of existing literature on OMV vaccine development.
• Discussion of genetic engineering strategies for antigen localization (surface/lumen) using fusion constructs (ClyA, Lpp-OmpA, AIDA-I, Hbp, Sec/Tat signal peptides).
• Analysis of methods to reduce lipopolysaccharide (LPS) toxicity and improve OMV production and stability.

Main Results:

• OMVs offer advantages such as safety, modularity, and targeted antigen delivery.
• Genetic engineering enables precise antigen presentation on or within OMVs.
• Preclinical studies demonstrate OMV efficacy against bacterial pathogens, viral infections, and cancer.

Conclusions:

• OMVs represent a versatile and scalable extracellular vesicle platform for next-generation vaccines.
• Further research is needed to address challenges in large-scale production, purification, and stability.
• OMV-based vaccines hold significant potential for diverse infectious diseases and beyond.