Identification of HnRNP-A2/B1 as a target antigen of anti-endothelial cell IgA antibody in Behçet's disease

Sung Bin Cho, Keun Jae Ahn, Do Hee Kim, Zhenlong Zheng, Suhyun Cho, Shin Wook Kang, Ju Hee Lee, Yong Beom Park, Kwang Hoon Lee, Dongsik Bang

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30 Citations (Scopus)


Behçets disease (BD) is a chronic, multisystemic vasculitis that theoretically affects all sizes and types of blood vessels. Although pathogenesis remains enigmatic, endothelial cells are believed to be the primary target in this disease. We detected the target protein using western blotting and immunoprecipitation and determined the amino-acid sequence of the peptide by liquid chromatography-matrix assisted laser desorption/ionization-tandem time-of-flight analysis (LC-MALDI-TOF/TOF). Serum reactivity against the recombinant target protein was analyzed by immunoblotting. Serum reactivity against streptococcal 65-kD heat shock protein (hsp-65) and the recombinant target protein was investigated by ELISA. The 36-40-kD protein band that was obtained from immunoprecipitation, which was analyzed by LC-MALDI-TOF/TOF, exhibited the amino-acid sequences of heterogeneous nuclear ribonucleoproteins A2/B1 (hnRNP-A2/B1). Reactivity of serum IgA against human recombinant hnRNP-A2/B1 was detected in 25 of 30 BD patients (83.3%), 4 of 30 systemic lupus erythematosus patients (13.3%), 8 of 30 rheumatoid arthritis patients (26.7%), 9 of 30 Takayasu's arteritis patients (30%), 6 of 30 healthy controls (20%), and none of 30 IgA nephropathy patients. Optical densities obtained from ELISAs against the recombinant human hnRNP-A2/B1 were correlated with those against the recombinant streptococcal hsp-65.JID JOURNAL CLUB ARTICLE: For questions, answers, and open discussion about this article, please go to

Original languageEnglish
Pages (from-to)601-608
Number of pages8
JournalJournal of Investigative Dermatology
Issue number3 PART 1
Publication statusPublished - 2012 Mar

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Dermatology
  • Cell Biology


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