Vaginal Lactobacilli Supernatants Protect from Herpes Simplex Virus Type 1 Infection in Cell Culture Models

Area of Science:

• Microbiology
• Virology
• Immunology

Background:

• The vaginal microbiota is dominated by Lactobacillus species, crucial for health.
• Lactobacilli produce antimicrobials that combat pathogens and modulate immunity.
• Previous studies show vaginal lactobacilli inhibit HIV-1 and HSV-2.

Purpose of the Study:

• To investigate the antiviral activity of vaginal lactobacilli supernatants against HSV-1.
• To assess the potential of lactobacilli as a therapeutic strategy against HSV-1, an emerging STI.

Main Methods:

• Analysis of supernatants from vaginal Lactobacillus species (L. crispatus, L. gasseri).
• Testing antiviral activity against HSV-1 in human and simian cell lines.
• Evaluation of specificity and cytotoxicity of the supernatants.

Main Results:

• Supernatants from L. crispatus and L. gasseri neutralized HSV-1 infection.
• L. crispatus strains demonstrated the most significant antiviral efficacy.
• The observed effect was specific and not due to general supernatant toxicity.

Conclusions:

• Vaginal lactobacilli, especially L. crispatus, possess significant anti-HSV-1 activity.
• These findings support the development of Lactobacillus-based probiotics for managing HSV-1 infections.
• This research highlights a promising avenue for improving women's health regarding STIs.