Increased circulating interleukin-23 level in patients with sarcoidosis

Area of Science:

• Immunology
• Rheumatology
• Pulmonology

Background:

• Sarcoidosis is a chronic inflammatory disease characterized by granulomas, with its exact pathogenesis involving proinflammatory cytokines still under investigation.
• The role of T-helper 1 (Th1) mediated pathways and associated cytokines in sarcoidosis is a key area of research.

Purpose of the Study:

• To investigate serum levels of key cytokines, including Interleukin-6 (IL-6), IL-12, IL-17, and IL-23, in patients diagnosed with sarcoidosis.
• To explore potential correlations between these serum cytokine levels and the clinical and laboratory manifestations of sarcoidosis.

Main Methods:

• A cohort of 44 biopsy-proven sarcoidosis patients and 41 healthy volunteers were enrolled.
• Serum samples were analyzed using ELISA to quantify IL-6, IL-12, IL-17, and IL-23 levels.
• Comprehensive clinical, laboratory, and radiological data were collected for all participants.

Main Results:

• Serum IL-23 levels were significantly higher in sarcoidosis patients compared to the control group (p=.01).
• Elevated serum IL-23 showed a positive association with the presence of ankle arthritis (p=.02).
• Serum levels of IL-6, IL-12, and IL-17 did not differ significantly between sarcoidosis patients and controls.

Conclusions:

• The study identified increased serum IL-23 in sarcoidosis patients, suggesting a potential role for this cytokine.
• While IL-6, IL-12, and IL-17 levels were found to be normal, the findings prompt further investigation into sarcoidosis as a Th1/Th17-mediated disease.
• Multicenter studies are recommended to validate these findings and clarify the cytokine involvement in sarcoidosis pathogenesis.