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Study on Helicobacter pylori sialylation and its potential immunomodulating activity

Research Project

Project/Area Number 17K17712
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Bacteriology (including mycology)
Epidemiology and preventive medicine
Research InstitutionTokyo Institute of Technology

Principal Investigator

IWATANI SHUN  東京工業大学, 生命理工学院, 助教 (80608373)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsヘリコバクター・ピロリ / ピロリ菌 / シアル酸 / シアル酸転移機構 / シアル酸転移酵素 / 細菌学 / 疫学・予防医学 / 細菌 / 感染症 / 糖鎖 / 免疫学
Outline of Final Research Achievements

The present work has revealed that a gene cluster responsible for sialic acid synthetase (neuA, neuB, neuC) and sialyltransferase (ST1, ST2) is conserved in a particular type of Helicobacter pylori isolates. It has been confirmed that these genes are constitutively expressed in growing H. pylori, and that recombinant ST1 and ST2 proteins from H. pylori exhibit sialyltransferase activities. Due to the functions of these genes, ST positive H. pylori strains sialylated their lipopolysaccharides and showed different antigenicity from ST negative H. pylori strains. As compared to ST-negative H. pylori strains, ST-positive H. pylori strain induced higher amount of Interleukin 8, a key mediator associated with inflammation, from macrophage-like human cell lines.

Academic Significance and Societal Importance of the Research Achievements

本研究成果により、一部のピロリ菌がシアル酸転移機構を有しており、自身の抗原性や病原性に影響を及ぼしていることが明らかとなった。これは、「ピロリ菌はシアル酸転移機構をもたない細菌である」という細菌学上の通説を覆す結果であり、同機構がピロリ菌の新たな病原因子であることを示す結果である。今後、同機構が新たな分子疫学マーカーとして評価されることで、新たなピロリ菌感染予防法、治療法の確立に貢献するものと期待する。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (11 results)

All 2019 2018 2017

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Identification and functional characterization of Candida albicans mannose-ethanolamine phosphotransferase (Mcd4p).2019

    • Author(s)
      Hasegawa S, Yamada Y, Iwanami N, Nakayama Y, Nakayama H, Iwatani S, Oura T, Kajiwara S.
    • Journal Title

      Current Genetics

      Volume: 65 Issue: 5 Pages: 1251-1261

    • DOI

      10.1007/s00294-019-00987-7

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Role of major facilitator superfamily transporter Qdr2p in biofilm formation by Candida glabrata.2019

    • Author(s)
      Widiasih Widiyanto T, Chen X, Iwatani S, Chibana H, Kajiwara S.
    • Journal Title

      Mycoses

      Volume: 62 Issue: 12 Pages: 1154-1163

    • DOI

      10.1111/myc.13005

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Long-Chain Acyl-CoA Synthetase is Associated with the Growth of Malassezia spp.2019

    • Author(s)
      Tenagy, Tejima K, Chen X, Iwatani S, Kajiwara S.
    • Journal Title

      Journal of Fungi (Basel)

      Volume: 5 Issue: 4 Pages: 88-88

    • DOI

      10.3390/jof5040088

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fungal NOX is an essential factor for induction of TG2 in human hepatocytes.2019

    • Author(s)
      Huang Y, Fujii K, Chen X, Iwatani S, Chibana H, Kojima S, Kajiwara S.
    • Journal Title

      Medical Mycology

      Volume: Epub ahead of print Issue: 5 Pages: 679-689

    • DOI

      10.1093/mmy/myz105

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Candida albicans fatty acyl-CoA synthetase, CaFaa4p, is involved in the uptake of exogenous long-chain fatty acids and cell activity in the biofilm2017

    • Author(s)
      Tejima Kengo、Ishiai Masanori、Murayama Somay O.、Iwatani Shun、Kajiwara Susumu
    • Journal Title

      Current Genetics

      Volume: 64 Issue: 2 Pages: 429-441

    • DOI

      10.1007/s00294-017-0751-2

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Fungus-derived hydroxyl radicals kill hepatic cells by enhancing nuclear transglutaminase2017

    • Author(s)
      Shrestha Ronak、Shrestha Rajan、Qin Xian-Yang、Kuo Ting-Fang、Oshima Yugo、Iwatani Shun、Teraoka Ryutaro、Fujii Keisuke、Hara Mitsuko、Li Mengqian、Takahashi-Nakaguchi Azusa、Chibana Hiroji、Lu Jun、Cai Muyi、Kajiwara Susumu、Kojima Soichi
    • Journal Title

      Scientific Reports

      Volume: 7 Issue: 1 Pages: 4746-4746

    • DOI

      10.1038/s41598-017-04630-8

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] ヘリコバクター・ピロリのシアル酸転移機構に関する研究2018

    • Author(s)
      船津光平、岩谷駿、梶原将
    • Organizer
      第17回 微生物研究会「微生物分子生物学のフロンティア」
    • Related Report
      2018 Research-status Report
  • [Presentation] Isolation and characterization of Cryptococcus neoformans urease complex.2018

    • Author(s)
      Omar N, Iwatani S, Kajiwara S
    • Organizer
      The International Society for Human & Animal Mycology
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Involvement of Candida albicans Bgl2p, Ecm33p and Als1p in adherence to saliva-coated surfaces.2018

    • Author(s)
      Nguyen HT, Inokawa N, Zhang R, Iwatani S, Holmes AR, Cannon RD, Kajiwara S
    • Organizer
      The International Society for Human & Animal Mycology
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Characterization of Acyl-CoA Synthetase Faa1p Involved in Fatty Acid Utilization of Malassezia spp..2018

    • Author(s)
      Tenagy, Ishiai M, Iwatani S, Kajiwara S
    • Organizer
      The International Society for Human & Animal Mycology
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Role of MFS Transporter QDR2 in a Pathogen Candida glabrata.2018

    • Author(s)
      Widiyanto TW, Chen X, Iwatani S, Chibana H, Kajiwara S
    • Organizer
      The International Society for Human & Animal Mycology
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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