Pathogenesis of pemphigus erythematosus

Area of Science:

• Dermatology
• Immunology
• Pathology

Background:

• Pemphigus erythematosus is an autoimmune blistering disease with features of both pemphigus foliaceus and lupus erythematosus.
• The role of immunofluorescence findings and potential associations with other autoimmune conditions require further elucidation.

Purpose of the Study:

• To investigate the diagnostic utility of immunofluorescence Band detection in pemphigus erythematosus.
• To explore the prevalence of antinuclear antibodies (ANA) and coexisting autoimmune diseases in these patients.

Main Methods:

• Indirect immunofluorescence (IIF) on 54 pemphigus erythematosus patients.
• Direct immunofluorescence (DIF) on skin specimens from light-exposed and unexposed regions in 50 patients.
• Detection of ANA and electron microscopy for virus-like particles.

Main Results:

• Immunofluorescence Band was detected in 81% of exposed skin sites and 23% of unexposed sites.
• Antinuclear antibodies (ANA) were present in approximately 31% of patients, often at lower titers than intercellular (IC) antibodies.
• Two cases each of coexisting myasthenia gravis/thymoma and systemic lupus erythematosus (SLE) were noted; virus-like particles were found in one SLE case.

Conclusions:

• The high detection rate of Immunofluorescence Band in skin, particularly in sun-exposed areas, supports its diagnostic significance in pemphigus erythematosus.
• The presence of ANA and occasional co-occurrence with SLE suggest a potential relationship between pemphigus erythematosus and lupus erythematosus.