Glucocorticoid sensitivity and proinflammatory cytokines pattern in pemphigus

Area of Science:

• Immunology
• Pharmacology

Background:

• Pemphigus treatment primarily relies on glucocorticoids (GC), but GC resistance is a significant clinical challenge.
• Understanding the mechanisms underlying GC resistance is crucial for improving patient outcomes.

Purpose of the Study:

• To investigate GC sensitivity in pemphigus patients compared to healthy controls.
• To explore the role of cytokine production in GC resistance in pemphigus.

Main Methods:

• Evaluated GC receptor binding sites (Bmax) and affinity (Kd) to dexamethasone (DEX) in 19 pemphigus patients and 41 controls.
• Assessed DEX-mediated inhibition of concanavalin-A (Con-A)-stimulated peripheral blood mononuclear cell (PBMC) proliferation.
• Measured basal and stimulated levels of cytokines IL-6, TNFα, IL-8, and IL-10.

Main Results:

• Pemphigus patients exhibited higher GC receptor Kd and Bmax values compared to controls.
• Elevated Kd and Bmax were observed in a significant proportion of pemphigus patients.
• Pemphigus patients showed higher basal and Con-A-stimulated production of IL-6 and TNFα, which were not fully inhibited by DEX, unlike in controls.

Conclusions:

• Pemphigus patients demonstrate altered GC sensitivity, characterized by changes in GC receptor parameters.
• Increased production of pro-inflammatory cytokines (IL-6, TNFα) in pemphigus may contribute to GC resistance.
• Targeting pro-inflammatory cytokines could be a potential therapeutic strategy for GC-resistant pemphigus.