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Analysis of the autoantigen for IEN type of IgA pemphigus and sublamina densa type of liner IgA Dermatosis

Research Project

Project/Area Number 23791299
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Dermatology
Research InstitutionKurume University

Principal Investigator

TUCHISAKA Atunari  久留米大学, 医学部, 研究員 (50599313)

Project Period (FY) 2011 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords皮膚診断学 / 皮膚正科学 / 免疫沈降 / 皮膚生化学 / 分子生物学
Research Abstract

In this study, to identify unknown autoantigen for intraepidermal neutrophilic IgA dermatosis type IgA pemphigus (IEN), we performed a new immunoprecipitation (IP), in which biotinylated KU-8 cell extract was precipitated by peptide M agarose, that has specific binding ability to human IgA. By the IP combined with mass spectrometry, we identified transmembrane secretory component (TSC) as a candidate. TSC was attractive as an antigen for IEN, because TSC delivers IgA in the mucosae. Polyclonal antibody (pAb) to TSC reacted with the epidermis in immunofluorescence (IF). We isolated human TSC cDNAs by PCR using KU-8 cell mRNA, and produced full-length eukaryotic TSC recombinant protein(RP) in COS-7 cells. Surprisingly, the full length TSC RP was recognized by both IEN IgA and normal IgA in both IP and IF studies, indicating that TSC has general binding ability to IgA. To detect antigen-specific binding by IEN IgA, we prepared several TSC cDNA constructs lacking N- or C-terminal gion. All TSC pAb, IEN IgA and normal IgA reacted with TSC RPs without C-terminus, like full length TSC. In contrast, TSC RP withoutN-terminus was recognized by TSC pAb but not by normal IgA, indicating that this RP lacks IgA-binding domain. However, IEN IgA also lost binding ability to this RP, suggestingthat IEN IgA did not react with TSC via antigen-antibody reactivity. Nevertheless, this study should be important, because this is the first study to show the presence of TSC in keratinocytes and to indicate the important role of TSC in immunity not only in the mucosae but also in the skin. Therefore, the TSC cDNA clones should be useful tools for the future studies of TSC functions in the epidermis. This study also indicates that TSCmay hamper detection of antigens for IgA autoantibodies

Report

(3 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Research-status Report
  • Research Products

    (5 results)

All 2013 2012 2011

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (4 results)

  • [Journal Article] Furumura M, and Hashimoto T. Polymeric immunoglobulin receptor hampers identification of IgA antibodies-reactive epidermal autoantigen2013

    • Author(s)
      Tsuchisaka A, Ishii N, Hamada T, Sogame R, Koga H, Tsuruta D, Ohata C
    • Journal Title

      PLOS ONE

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Presentation] 自己免疫性水疱症の新規自己抗原同定2013

    • Author(s)
      土坂享成、石井文人、古賀浩嗣、濱田尚宏、大畑千佳、古村南夫、橋本隆.
    • Organizer
      第20回分子皮膚科学フォーラム
    • Place of Presentation
      東京
    • Related Report
      2012 Final Research Report
  • [Presentation] An attempt to identify antigen for IgA pemphigus accidentally showed the presence of transmembrane secretory component in keratinocytes2012

    • Author(s)
      Tsuchisaka A, Ishii N, Koga H, Hamada T, Ohata C, Furumura M, and Hashimoto T.
    • Organizer
      The 37th Annual Meeting of theJapanese Society for InvestigativeDermatology.
    • Place of Presentation
      OkinawaJapan
    • Related Report
      2012 Final Research Report
  • [Presentation] An attempt to identify antigen for IgA pemphigus accidentally2012

    • Author(s)
      土坂享成、石井文人、古賀浩嗣、濱田尚宏、大畑千佳、古村南夫、橋本隆
    • Organizer
      he 37th Annual Meeting of the Japanese Society for Investigative Dermatology
    • Place of Presentation
      Pacific Hotel Okinawa (沖縄)
    • Related Report
      2012 Annual Research Report
  • [Presentation] Analysis of autoantigen for IgA-related bullous skin diseases2011

    • Author(s)
      Tsuchisaka A, Ishii N, and HashimotoT.
    • Organizer
      International Mini Symposium for BullousDiseases in Kurume.
    • Place of Presentation
      Kurunme, Japan
    • Year and Date
      2011-10-14
    • Related Report
      2012 Final Research Report

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Published: 2011-08-05   Modified: 2019-07-29  

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