Soluble serum interleukin 2 receptor levels in leprosy patients

Area of Science:

• Immunology
• Infectious Diseases
• Dermatology

Background:

• Leprosy is a complex infectious disease affecting the skin and peripheral nerves.
• Interleukin 2 receptor (IL-2R) plays a crucial role in immune responses.
• Quantifying IL-2R levels may offer insights into leprosy pathogenesis and immune status.

Purpose of the Study:

• To quantify soluble interleukin 2 receptor (IL-2R) levels in sera of leprosy patients in Thailand.
• To investigate the correlation between IL-2R levels and different leprosy types, clinical manifestations, and treatment responses.

Main Methods:

• Solid phase enzyme immunoassay utilized to measure serum IL-2R.
• Monoclonal antibodies specific to IL-2R were employed for quantification.
• Comparison of IL-2R levels across various leprosy patient groups, healthy contacts, and US control subjects.

Main Results:

• Elevated IL-2R levels were observed in untreated lepromatous and borderline lepromatous leprosy patients compared to US controls.
• Significantly reduced IL-2R levels were found in untreated tuberculoid and borderline tuberculoid leprosy patients.
• Patients experiencing reversal reactions exhibited very high IL-2R levels, correlating with fever and skin lesions.
• Erythema nodosum leprosum patients showed elevated IL-2R, but significantly lower than those with reversal reactions.
• Corticosteroid treatment led to a marked decrease in IL-2R in reversal reaction patients, but not in erythema nodosum leprosum patients.

Conclusions:

• Serum IL-2R levels are differentially modulated in various forms of leprosy and associated reactions.
• IL-2R may serve as a potential biomarker for monitoring reversal reactions and treatment efficacy in leprosy.
• The distinct responses of IL-2R to corticosteroid treatment highlight differences between reversal reactions and erythema nodosum leprosum.