Bacterial Extracellular Vesicles in the Strategic Interplay Between Pathogens and Hosts

Area of Science:

• Microbiology
• Molecular Biology
• Evolutionary Biology

Background:

• Bacterial extracellular vesicles (BEVs), including outer membrane vesicles (OMVs) and membrane vesicles (MVs), are secreted by bacteria.
• BEV biogenesis is energy-intensive but offers significant evolutionary advantages.
• BEVs play multifaceted roles in bacterial interactions with hosts and the environment.

Purpose of the Study:

• To review the central roles of BEVs in mediating bacterial responses.
• To emphasize BEVs' involvement in immune regulation, environmental adaptation, and interspecies competition.
• To provide insights into pathogen evolutionary strategies mediated by BEVs.

Main Methods:

• Literature review of studies on bacterial extracellular vesicles.
• Analysis of BEV functions in bacterial adaptation and host interaction.
• Synthesis of current knowledge on BEVs in pathogen evolution.

Main Results:

• BEVs facilitate adaptation to environmental stress (e.g., remodeling membranes, eliminating toxins).
• BEVs are involved in interbacterial transfer of antibiotic resistance and biofilm formation.
• BEVs act as decoys, deliver virulence factors, modulate host immunity, and mediate interspecies competition.

Conclusions:

• BEVs are critical mediators of bacterial environmental responses and evolutionary strategies.
• Understanding BEVs offers new perspectives on pathogen virulence and adaptation.
• BEVs are central to bacterial survival, immune evasion, and competitive interactions.