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Mechanism of abnormally glycosylated IgA production in the palatine tonsil

Research Project

Project/Area Number 20K22915
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0902:General internal medicine and related fields
Research InstitutionFujita Health University

Principal Investigator

Ohyama Yukako  藤田医科大学, 医学部, 講師 (70879717)

Project Period (FY) 2020-09-11 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsIgA腎症 / O結合型糖鎖 / 口蓋扁桃 / 形質細胞 / IgA1ヒンジ部O結合型糖鎖 / 糖転移酵素 / サイトカイン / プロテオミクス / ゲノミクス / IgAO結合型糖鎖 / 扁桃
Outline of Research at the Start

IgA腎症患者血中では異常な糖鎖構造をもつIgA(糖鎖異常IgA)が増加しており、病態に関与している。IgA腎症は上気道感染や腸炎などの粘膜感染契機に病態が悪化することから、粘膜関連リンパ組織の腎炎原性IgA産生の関与が疑われる。アジア人では特に上気道炎契機に病勢が悪化することが多く、近年日本人患者における口蓋扁桃摘出術の腎保護効果が示された。そこで、本研究ではIgA腎症患者と腎症非発症慢性扁桃炎患者の口蓋扁桃を用いて、腎炎原性IgA1糖鎖構造形成機序の解明を目指す。

Outline of Final Research Achievements

From previous studies, we have found that patients with IgA nephropathy (IgAN) are characterized by increased blood levels of IgA1 with a reduced number of O-glycans (O-glycan decreased-IgA1). In this study, we aimed to clarify the role of the palatine tonsil as the production source of mother of production of IgA1 with abnormal glycan structures. The study revealed that patients with chronic tonsillitis without nephropathy have an increased percentage of O-glycan decreased IgA1 in their serum, similar to patients with IgAN, but that IgA levels are further increased in patients with IgAN. In the palatine tonsils, the percentage of IgA-producing plasma cells was found to be increased compared to patients with chronic tonsillitis. It is predicted that migration of IgA-producing plasma cells from the palatine tonsils into the bloodstream is involved in the pathogenesis of the disease.

Academic Significance and Societal Importance of the Research Achievements

近年IgA腎症の治療薬としてLong lived plasma cellをターゲットにした抗CD38モノクローナル抗体の臨床治験が開始されている。本研究によって得られた、IgA腎症患者口蓋扁桃中IgA産生形質細胞増加は、扁桃摘出術だけでなくこうした治療薬の有用性を裏付ける可能性がある。我々は、最終年度に、フローサイトメトリーを用いて、IgA形質細胞中Long lived plasma cell (LLPC)サブセットを解析する手法を確立した。IgA産生Long lived plasma cellについては生理的・病態的意義について未解明な点が多いため、さらに詳細な検証が期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (11 results)

All 2023 2022 2021 2020

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (8 results) (of which Int'l Joint Research: 5 results) Book (1 results)

  • [Journal Article] Racial heterogeneity of IgA1 hinge-region O-glycoforms in patients with IgA nephropathy2022

    • Author(s)
      Ohyama Y, Yamaguchi H, Ogata S, Chiurlia S, Cox SN, Kouri NM, Stangou MJ, Nakajima K, Hayashi H, Inaguma D, Hasegawa M, Yuzawa Y, Tsuboi N, Renfrow MB, Novak J, Papagianni AA, Schena FP, Takahashi K.
    • Journal Title

      iScience

      Volume: 25 Issue: 11 Pages: 105223-105223

    • DOI

      10.1016/j.isci.2022.105223

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Aberrantly Glycosylated IgA1 in IgA Nephropathy: What We Know and What We Don’t Know2021

    • Author(s)
      Ohyama Yukako、Renfrow Matthew B.、Novak Jan、Takahashi Kazuo
    • Journal Title

      Journal of Clinical Medicine

      Volume: 10 Issue: 16 Pages: 3467-3467

    • DOI

      10.3390/jcm10163467

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] IgA腎症における血中O結合型糖鎖異常IgA1増加と口蓋扁桃の関連2023

    • Author(s)
      大山友香子、辻雄大、手塚裕之、稲熊大城、長谷川みどり、楯谷一郎、坪井直毅、髙橋和男
    • Organizer
      第66回日本腎臓学会総会
    • Related Report
      2022 Annual Research Report
  • [Presentation] The amount of complement factor H-related protein-1 in serum IgA immune complexes as a novel biomarker for IgA nephropathy2023

    • Author(s)
      Yukako Ohyama, Tetsuro Enomoto, Yudai Tsuji, Hisateru Yamaguchi, Tomohiro Mizuno, Naotake Tsuboi, Kazuo Takahashi
    • Organizer
      17 th International Symposium of IgA Nephropathy
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Longitudinal changes in IgA1 O- and N-glycoforms in IgA nephropathy2023

    • Author(s)
      Masaya Hirayama, Yukako Ohyama, Tetsuro Enomoto, Yudai Tsuji, Naotake Tsuboi, Kazuo Takahashi
    • Organizer
      17 th International Symposium of IgA Nephropathy
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] IgA腎症扁摘パルス治療群のO結合型糖鎖とN結合型糖鎖構造の治療前後変化2023

    • Author(s)
      平山将也、大山友香子、辻雄大、坪井直毅、髙橋和男
    • Organizer
      第46回IgA腎症研究会学術集会
    • Related Report
      2022 Annual Research Report
  • [Presentation] IgA腎症におけるIgA1ヒンジ部O結合型糖鎖構造の治療前後変化2022

    • Author(s)
      大山友香子、辻雄大、林宏樹、小出滋久、稲熊大城、長谷川みどり、坪井直毅、高橋和男
    • Organizer
      第65回日本腎臓学会総会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Longitudinal changes of IgA1 O-glycoforms in IgA nephropathy2021

    • Author(s)
      Yukako Ohyama, Hisateru Yamaguchi, Kazuki Nakajima, Hiroki Hayashi, Shigehisa Koide, Midori Hasegawa, Daijo Inaguma, Matthew B Renfrow, Jan Novak, Yukio Yuzawa, Naotake Tsuboi, Kazuo Takahashi
    • Organizer
      16th International Symposium of IgA Nephropathy
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Racial heterogeneity of IgA1 hinge region O-glycoforms in patients with IgA nephropathy2020

    • Author(s)
      Yukako Ohyama, Samantha Chiurlia, Sharon N. Cox, Nikoletta-Maria Kouri, Maria J. Stangou, Hisateru Yamaguchi , Kazuki Nakajima , Daijo Inaguma, Midori Hasegawa, Yukio Yuzawa, Naotake Tsuboi, Aikaterini A. Papagianni, Francesco P. Schena, Kazuo Takahashi
    • Organizer
      アメリカ腎臓学会
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Longitudinal changes of IgA1 O-glycoforms in IgA nephropathy2020

    • Author(s)
      Yukako Ohyama, Hisateru Yamaguchi, Kazuki Nakajima, Daijo Inaguma, Midori Hasegawa, Naotake Tsuboi, Matthew B Renfrow, Jan Novak, Yukio Yuzawa, Kazuo Takahashi
    • Organizer
      ヨーロッパ腎臓学会
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Book] 腎と透析 92巻6号 IgA腎症ー最新の知見2022

    • Author(s)
      大山友香子、髙橋和男
    • Total Pages
      6
    • Publisher
      東京医学社
    • Related Report
      2022 Annual Research Report

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Published: 2020-09-29   Modified: 2024-01-30  

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