Composition of calcifications in children with juvenile dermatomyositis: Association with chronic cutaneous inflammation

Lauren M. Pachman*, Arthur Veis, Stuart Stock, Kathy Abbott, Frank Vicari, Pravin Patel, Diana Giczewski, Catherine Webb, Lyudmila Spevak, Adele L. Boskey

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


Objective. Calcific deposits develop in 20-40% of children with juvenile dermatomyositis (juvenile DM), contributing to disease morbidity and mortality. This study was undertaken to define the structure and composition of these deposits and to characterize their association with chronic inflammation. Methods. We examined calcific deposits from 5 children with juvenile DM (2 boys and 3 girls). The crystal structure and mineral content of the deposits was analyzed by x-ray diffraction, Fourier transform infrared spectroscopy, and imaging. The protein content of the deposits, following solubilization, was assayed by Western blotting. Results. All 5 children had both a young age at disease onset (mean ± SD 3.3 ± 1.9 years) and, despite therapy, persistent cutaneous inflammation (mean ± SD duration 81.3 ± 58.7 months). The bone proteins, osteopontin, osteonectin, and bone sialoprotein, were identified in the protein extracts; the only mineral detected was hydroxyapatite, but the tissue was distinct from bone, with an extremely high mineral content and an irregular distribution of mineral. Conclusion. These results indicate that chronic cutaneous inflammation may contribute to the formation of hydroxyapatite-containing pathologic calcifications in children with juvenile DM.

Original languageEnglish (US)
Pages (from-to)3345-3350
Number of pages6
JournalArthritis and rheumatism
Issue number10
StatePublished - Oct 2006

ASJC Scopus subject areas

  • Pharmacology (medical)
  • Immunology and Allergy
  • Rheumatology
  • Immunology


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