Vaginal bacteria-derived extracellular vesicles diffuse through human cervicovaginal mucus to enable microbe-host...

Area of Science:

• Reproductive Biology
• Microbiology
• Gynecology and Obstetrics

Background:

• The vaginal microenvironment's composition is critical for gynecologic and obstetric outcomes.
• A Lactobacillus-dominated environment is optimal, while polymicrobial environments increase the risk of female reproductive diseases.
• Bacteria-derived extracellular vesicles (bEVs) are key mediators of microbe-host communication in the reproductive tract.

Purpose of the Study:

• To investigate the ability of bEVs to penetrate the cervicovaginal mucus barrier.
• To evaluate the uptake of bEVs by human vaginal epithelial, endometrial, and placental cells.
• To elucidate the effects of bEVs on these cells and identify mechanisms linking vaginal dysbiosis to reproductive diseases.

Main Methods:

• Comparative diffusion analysis of bEVs versus whole bacteria through cervicovaginal mucus.
• In vitro uptake studies using human vaginal epithelial, endometrial, and placental cell lines.
• Assessment of cellular responses following bEV exposure.

Main Results:

• bEVs demonstrated significantly increased diffusion rates compared to whole bacteria.
• Human vaginal epithelial, endometrial, and placental cells were found to uptake bEVs.
• Specific effects of bEVs on reproductive cells were observed, suggesting mechanisms of action.

Conclusions:

• bEVs can effectively penetrate the cervicovaginal mucus barrier, facilitating microbe-host communication.
• bEVs interact with and affect key cells of the female reproductive tract, potentially contributing to disease.
• bEVs represent potential therapeutic targets for managing vaginal dysbiosis and associated gynecologic/obstetric conditions.