Vaginal immune system (VIS)

The vaginal immune system is a complex, compartmentalized component of the mucosal immune system designed to protect the female reproductive tract from pathogens while maintaining tolerance to commensal microbes and sperm (Wira et al., 2005, Nature Reviews Immunology). It consists of physical barriers, such as the stratified squamous epithelium, and a diverse array of innate and adaptive immune components, including neutrophils, macrophages, T cells, and B cells (Hickey et al., 2011, Molecular Human Reproduction). The system is heavily influenced by hormonal fluctuations during the menstrual cycle and the presence of a healthy, Lactobacillus-dominant microbiome, which maintains an acidic pH through lactic acid production (Anahtar et al., 2018, NIH). Dysregulation of this system, often characterized by a shift in microbial diversity or increased pro-inflammatory cytokines, is linked to increased susceptibility to sexually transmitted infections, including HIV (NIH, 2021). While not a single molecular target, various components of the vaginal immune system are targeted by microbicides, vaccines, and probiotics to enhance local defense mechanisms and prevent disease transmission (PubChem, 2023). Understanding the interplay between the microbiome and local immunity is critical for developing effective topical therapeutics and preventative measures for reproductive health.

Other names

Female reproductive tract immune systemVaginal mucosal immunityVaginal mucosal immune systemLower female reproductive tract immune environment

Modulation of the local mucosal environment through the regulation of cytokine production, recruitment of innate and adaptive immune cells, and maintenance of commensal microbiota to prevent pathogen colonization and enhance epithelial barrier integrity.