Douching Alters Rectal Immune Response and Microbiome in Sexual Minority Men
Overview
In sexual minority men (SMM) engaging in receptive condomless anal sex (CAS), rectal douching is associated with increased rectal inflammation and altered microbial diversity. These changes may amplify HIV and STI acquisition risk by disrupting mucosal immunity and microbial community structure.
Background
Receptive CAS in SMM is linked to elevated rectal inflammation, mucosal injury, and shifts in microbial communities, which can increase susceptibility to HIV. Rectal douching, a common practice among SMM, may exacerbate these effects by causing epithelial damage and inflammation. Understanding how douching influences rectal mucosal immunity and microbiota is critical for optimizing HIV/STI prevention strategies in this population.
Data Highlights
Group
Number of Participants
Median Age (years)
Receptive CAS Partners
Rectal Cytokine/Chemokine Levels
Microbial Diversity Metrics
Douchers
64
34.6
Higher
Elevated (immune activation/inflammation)
Lower richness, evenness, Shannon diversity
Non-Douchers
27
34.6
Lower
Lower
Higher diversity metrics
Key Findings
SMM who douche report more receptive CAS partners than nondouchers.
Douching is associated with elevated rectal cytokines and chemokines indicative of immune activation and inflammation.
Microbial richness, evenness, and Shannon diversity are significantly lower in SMM who douche.
Significant correlations exist between rectal cytokine/chemokine levels and microbial alpha diversity metrics.
Specific microbial genera correlate with rectal cytokine and chemokine concentrations, suggesting microbiome-immune interactions.
Douching may serve as a behavioral marker identifying SMM at higher biobehavioral risk for HIV/STI acquisition.
Clinical Implications
Clinicians should recognize rectal douching as a potential modifier of mucosal immunity and microbiota that may increase HIV/STI risk among SMM engaging in receptive CAS. Counseling on safer douching practices or alternatives could be integrated into prevention programs. Further research into targeted biomedical interventions addressing douching-induced mucosal disruption may enhance HIV/STI prevention efforts.
Conclusion
Rectal douching among sexual minority men engaging in receptive CAS is linked to heightened mucosal inflammation and altered microbial communities, potentially increasing vulnerability to HIV and other STIs. Addressing douching behaviors may be critical for optimizing prevention strategies in this population.
References
Article Source 2024 -- Douching Linked to Altered Rectal Mucosal Immune Response in Sexual Minority Men
by Courtney A Broedlow, Angela McGaugh, Tiffany R Glynn, Emily M Cherenack, Charlene Miller, Maria L Alcaide, Jose A Bauermeister, Christian Grov, Robert Parisi, Darling Martinez, Adam W Carrico, Nichole R Klatt, Jennifer A Manuzak
