Why do lactobacilli dominate the human vaginal microbiota?

Area of Science:

• Microbiology
• Women's Health
• Reproductive Science

Background:

• Lactobacilli dominate the vaginal microbiota in healthy women.
• These bacteria produce lactic acid, inhibiting pathogenic bacterial growth and adhesion.
• Lactic acid also influences host cell functions like gene transcription, DNA repair, and autophagy.

Purpose of the Study:

• To elucidate the protective mechanisms of vaginal Lactobacilli.
• To understand how Lactobacilli modulate the host inflammatory response.
• To explore the link between Lactobacilli, inflammation, and reproductive outcomes.

Main Methods:

• Review of existing literature on Lactobacilli and vaginal health.
• Analysis of the biochemical and cellular effects of lactic acid.
• Examination of the impact of stress on vaginal microbiota composition.

Main Results:

• Lactobacilli inhibit pathogen binding and growth via lactic acid production.
• Lactic acid enhances host cell processes, including DNA repair and autophagy.
• Lactobacilli modulate the immune response, preventing pro-inflammatory cytokine induction.
• Emotional stress may disrupt the vaginal microbiota, increasing inflammation.

Conclusions:

• Vaginal Lactobacilli are crucial for preventing infections without triggering inflammation.
• Maintaining a healthy Lactobacilli population supports fertility and optimal pregnancy outcomes.