Antinuclear antibodies in children with localized scleroderma

Area of Science:

• Pediatric Rheumatology
• Immunology
• Dermatology

Background:

• Localized scleroderma is a connective tissue disease affecting children.
• Antinuclear antibodies (ANA) are autoantibodies associated with autoimmune diseases.
• Understanding ANA profiles in pediatric localized scleroderma is crucial for diagnosis and management.

Purpose of the Study:

• To investigate the prevalence of ANA in children diagnosed with localized scleroderma.
• To identify the specific antigenic targets of ANA in this pediatric population.
• To compare ANA findings in localized scleroderma with those in systemic sclerosis.

Main Methods:

• Sera from 27 children with localized scleroderma were analyzed.
• Indirect immunofluorescence was used to detect ANA.
• ELISA and immunoblotting assays identified specific nuclear antigen reactivity, including denatured DNA (dDNA), high mobility group (HMG) proteins, histones, and topoisomerase I.

Main Results:

• 63% of children with localized scleroderma tested positive for ANA.
• Antibodies to denatured DNA (dDNA) were found in 56% of sera, and antibodies to high mobility group (HMG) proteins in 41%.
• Antibodies to histones and topoisomerase I were less common (15% and 4%, respectively).

Conclusions:

• ANA are prevalent in childhood localized scleroderma, frequently directed against dDNA and HMG proteins.
• The ANA profile in localized scleroderma shares similarities with systemic sclerosis, particularly regarding dDNA antibodies.
• Childhood localized scleroderma is less commonly associated with specific nuclear and nucleolar autoantibodies typical of systemic sclerosis.