Clotrimazole-induced shifts in vaginal bacteriome and lipid metabolism: insights into recovery mechanisms in vulvovaginal candidiasis.

Aims: Vulvovaginal candidiasis (VVC) is a prevalent condition affecting a significant proportion of women worldwide, with recurrent episodes leading to detrimental effects on quality of life. While treatment with clotrimazole is common, the specific alterations it evokes in the vaginal bacteriome and metabolome were previously underexplored.

Methods and results: In this prospective study, we enrolled reproductive-age women diagnosed with single VVC and conducted comprehensive analyses of vaginal fungi, bacteriome, and metabolome before and after local clotrimazole treatment. We observed a significant reduction in Candida albicans and notable improvements in vaginal cleanliness. Advanced sequencing revealed substantial shifts in the vaginal bacteriome, with an increase in Lactobacillus-dominant communities post-treatment. Our findings identified 17 differentially abundant bacterial species, including notable decreases in pathogenic anaerobes such as Gardnerella vaginalis, Dialister micraerophilus, and Aerococcus christensenii, suggesting a restoration of a healthier microbial balance. Furthermore, metabolomic analysis revealed significant changes in 230 metabolites, particularly within lipid metabolism pathways, with marked downregulation of lipid-related compounds linked to inflammation. Correlation studies indicated a strong interplay between lipid metabolites and specific bacterial species, emphasizing the influence of clotrimazole treatment on microbial and metabolic interactions. Importantly, predictive models using microbiota and metabolite signatures demonstrated high accuracy in distinguishing pre- and post-treatment states.

Conclusions: This research highlights clotrimazole's dual role in effectively clearing Candida infection and promoting a healthier vaginal microenvironment, paving the way for novel microbial and metabolomic-based diagnostic approaches to enhance VVC management and understand its underlying mechanisms.