Systemic and mucosal differences in HIV burden, immune, and therapeutic responses

Area of Science:

• Immunology
• Virology
• Infectious Diseases

Background:

• Mucosal tissues are key sites for HIV transmission.
• Mechanisms behind differing susceptibility and reservoir function in mucosal tissues remain unclear.

Purpose of the Study:

• To compare HIV RNA and infectious virus levels in oral, genital, and blood compartments in HIV-infected women.
• To investigate associations with clinical parameters, co-infections, and innate/adaptive HIV inhibitors.

Main Methods:

• Cross-sectional study design.
• Comparison of HIV RNA and infectious virus across oral, genital, and blood compartments.
• Analysis of clinical parameters, co-pathogens, and immune factors (innate/adaptive inhibitors, IgA, IgG).

Main Results:

• HIV RNA detected in 24.5% across all three compartments; 45% in one or two sites.
• Infectious HIV was rare in mucosal sites but common in blood.
• Highly active antiretroviral therapy (HAART) reduced shedding by 80%.
• Mucosal HIV RNA associated with higher plasma RNA, infectious virus, and mucosal IgA.
• Increased IgA levels correlated with a 37-fold higher probability of detectable HIV RNA in genital and oral specimens.

Conclusions:

• Mucosal sites display unique HIV characteristics and responses to therapy, influenced by systemic and local factors.
• Immunoglobulin A (IgA) was associated with HIV RNA shedding, but higher levels increased, rather than decreased, shedding probability.
• Findings highlight the complex role of mucosal immunity in HIV persistence and shedding.