Host and Microbiome Interplay Shapes the Vaginal Microenvironment.
Level 5 - mechanism / opinion, no new human data
Narrative review without systematic search methodology or original clinical data
PubMed 35837395 · doi:10.3389/fimmu.2022.919728
What was done
This narrative review synthesized literature on the reciprocal interactions between the human host and the vaginal microbiome. It evaluated mechanisms of homeostasis, particularly host glycogen provision and Lactobacillus-mediated acidification, as well as the dynamic shifts in microbial composition driven by hormonal fluctuations, pregnancy, and external factors.
What was found
The abstract reports no primary quantitative data, meta-analytic estimates, or specific numbers. It describes the mechanistic relationship where host cells supply glycogen as an energy source for Lactobacillus, which in turn generates lactic acid to maintain a low vaginal pH and suppress pathogenic growth. It also identifies associations between bacterial vaginosis, immune system modulation, and elevated risks of sexually transmitted infections, gynecologic malignancies, and poor pregnancy outcomes.
Why it matters
Understanding the bidirectional regulation between host physiology and microbial dynamics provides a mechanistic framework for identifying diagnostic and therapeutic targets in women's reproductive health.
Limits
The publication is a narrative review and does not present original empirical data, sample sizes, or systematic search protocols. It relies on qualitative summaries of previous studies without risk-of-bias assessment or quantitative effect measures.
Cited by
- supports Estrogen increases glycogen production in the vaginal canal, which feeds Lactobacilli that produce lactic acid to maintain vaginal pH.