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Structural diversity and specific immunomodulatory potential of lipoteichoic acids in lactic acid bacteria

Research Project

Project/Area Number 17K15247
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Applied microbiology
Research InstitutionSapporo Medical University

Principal Investigator

Shiraishi Tsukasa  札幌医科大学, 医学部, 助教 (70725168)

Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsグラム陽性細菌 / 乳酸菌 / Lactobacillus gasseri / リポテイコ酸 / 表層局在 / 応用微生物 / プロバイオティクス
Outline of Final Research Achievements

I investigated structural diversity of lipoteichoic acids (LTA) of lactic acid bacteria, such as Lactobacillus gasseri, and aimed to elucidate relationship between the specific structures and immunomodulatory activity. LTA structural analysis was performed for seven strains of L. gasseri. A structure common to all strains was found, suggesting that the structure is species-specific. L. gasseri LTA showed lesser inhibitory activity of lipopolysaccharide-induced IL-8 production in a human intestinal epithelial cell line than Staphylococcus aureus and Lactococcus lactis ones. Localization of LTA in the bacterial cell surface showed dramatic change at each growth phase.

Academic Significance and Societal Importance of the Research Achievements

LTAは、細菌にとっての生理学的な役割だけでなく、免疫調節など宿主と相互作用する細胞表層分子である。株レベルで構造に多様性があることが報告されているが、その大部分は病原性細菌のものである。本研究では、有用細菌であるヒト腸管乳酸菌の L. gasseri を中心に、種特異的なLTAの構造を明らかにし、このLTAに特徴的な免疫反応調節活性が示唆されたことは、LTAを介した宿主と細菌との相互作用機序の解明において重大な意義を持つ。さらに、将来的にLTA自体を免疫調節剤としてのバイオジェニクスとして応用することも可能であると考えられ、社会的な意義も大きいと考えられる。

Report

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

    (5 results)

All 2018 2017

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

  • [Journal Article] Lipoteichoic acids are embedded in cell walls during logarithmic phase, but exposed on membrane vesicles in Lactobacillus gasseri JCM 1131T.2018

    • Author(s)
      Tsukasa Shiraishi, Shin-ichi Yokota, Yamaha Sato, Toshiaki Ito, Satoru Fukiya, Soh Yamamoto, Toyotaka Sato, Atsushi Yokota.
    • Journal Title

      Beneficial Microbes

      Volume: 9 Issue: 4 Pages: 653-662

    • DOI

      10.3920/bm2017.0124

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Lipoteichoic acid of Lactobacillus gasseri influences IL-8 production in intestinal epithelial cells2018

    • Author(s)
      久富亮佑、白石宗、佐藤豊孝、横田伸一
    • Organizer
      第91回日本細菌学会総会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 乳酸桿菌の対数期に膜小胞上に局在するリポテイコ酸2018

    • Author(s)
      白石宗、横田伸一、佐藤耶舞羽、伊藤利章、吹谷智、山本聡、佐藤豊孝、横田篤
    • Organizer
      2018年度日本乳酸菌学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Lactobacillus gasseri に見られる種特異的なリポテイコ酸の化学構造2017

    • Author(s)
      白石宗、横田伸一
    • Organizer
      第23回日本エンドトキシン・自然免疫研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] Lactobacillus gasseri 種に共通する種特異的なリポテイコ酸の化学構造2017

    • Author(s)
      久富亮佑、白石宗、佐藤耶舞羽、森田直樹、吹谷智、佐藤豊孝、横田篤、横田伸一
    • Organizer
      2017年日本乳酸菌学会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2020-03-30  

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