Cytokine expression in Treponema pallidum infection

Area of Science:

• Immunology
• Infectious Diseases
• Biomarker Discovery

Background:

• Current syphilis diagnostics struggle to differentiate active from past infections in patients with serofast Rapid Plasma Reagin (RPR) titers.
• This limitation hinders effective treatment monitoring and patient management.

Purpose of the Study:

• To investigate whether cytokine profiles can differentiate between active and treated syphilis.
• To explore potential cytokine biomarkers for identifying active syphilis.

Main Methods:

• A prospective cohort study collected quarterly serum samples from men and male-to-female transgender women at risk for syphilis.
• Cytokine expression was measured using a 63-multiplex bead-based Luminex assay.
• Statistical analyses, including Chi-square tests and network analysis, were used to compare cytokine profiles between active and treated syphilis groups.

Main Results:

• Twenty pairs of cytokines showed significant differences between active and treated syphilis.
• Three distinct cytokine networks were identified: Eotaxin-Rantes-Leptin, Mig-IL1ra-Trail-CD40L, and IL12p40-IL12p70.
• These findings suggest specific cytokine patterns are associated with active syphilis.

Conclusions:

• Distinct cytokine profiles exist between active and treated syphilis in the studied population.
• Cytokine assays show promise as a tool to identify active syphilis in individuals with serologic reactivity.
• Further research may validate cytokine profiling for improved syphilis diagnosis and management.