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Regulation of neutrophil functions mediated by an autophagy machinery against multi-drug resistant bacterial infection

Research Project

Project/Area Number 16K09932
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Infectious disease medicine
Research InstitutionNagahama Institute of Bio-Science and Technology

Principal Investigator

Itoh Hiroshi  長浜バイオ大学, バイオサイエンス学部, 准教授 (20362387)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords好中球 / オートファジー / 感染症 / 炎症 / 自然免疫 / IL-8 / S100A8/A9 / 細胞死 / 多剤耐性菌
Outline of Final Research Achievements

Neutrophil is a type of leukocyte that plays a central role in the primary machinery of host defense against bacterial infection. Neutrophils exert the bactericidal activity by producing reactive oxygen species (ROS) after engulfing bacteria in infected site. Autophagy which are intracellular protein degradation mechanisms are induced in the neutrophils depending on the production of ROS.
The experimental results of the present study show that induced autophagy affects neutrophil cell death, degradation of S100A8/A9, which is a calcium-binding protein abundant in the cytoplasm, and production of the chemokine IL-8. Therefore, it was suggested that the autophagy affect the pathogenesis at the site of bacterial infection and functions of the neutrophils in the site.

Academic Significance and Societal Importance of the Research Achievements

本研究は易感染性患者の難治性、重症の細菌感染症に対する治療法として、抗菌薬を主体とした従来の考え方ではなく、生体防御機構を活用する観点から新たな治療戦略に繋げる点に特色がある。好中球機能におけるオートファジーの役割の詳細を明らかにすることにより、オートファジーを介した全く新しい好中球機能の制御法が期待される。これにより、抗菌薬だけでは解決できない易感染性患者の多剤耐性菌感染症に対する新規治療法の開発に繋がり、治療成績の向上が期待される。また、過剰な好中球機能の発現による炎症病態に対する新たな抗炎症の治療法の開発に繋がることも期待される。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (9 results)

All 2019 2018 2016 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (2 results) Remarks (4 results)

  • [Journal Article] Establishment of S100A8 Transgenic Rats to Understand Innate Property of S100A8 and Its Immunological Role2018

    • Author(s)
      Okada Kohki、Itoh Hiroshi、Kamikubo Yasuhiko、Adachi Souichi、Ikemoto Masaki
    • Journal Title

      Inflammation

      Volume: 41 Issue: 1 Pages: 59-72

    • DOI

      10.1007/s10753-017-0664-8

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] CD68 on rat macrophages binds tightly to S100A8 and S100A9 and helps to regulate the cells' immune functions.2016

    • Author(s)
      Okada K, Arai S, Itoh H, Adachi S, Hayashida M, Nakase H, Ikemoto M
    • Journal Title

      Journal of Leukocyte Biology

      Volume: 100 Issue: 5 Pages: 1093-1104

    • DOI

      10.1189/jlb.2a0415-170rrr

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Journal Article] CXCR4 overexpression is a poor prognostic factor in pediatric acute myeloid leukemia with low risk: a report from the Japanese Pediatric Leukemia/Lymphoma Study Group2016

    • Author(s)
      Matsuo H, Nakamura N, Tomizawa D, Saito AM, Kiyokawa N, Horibe K, Nishinaka-Arai Y, Tokumasu M, Itoh H, Kamikubo Y, Nakayama H, Kinoshita A, Taga T, Tawa A, Taki T, Tanaka S, Adachi S
    • Journal Title

      Pediatr Blood Cancer

      Volume: 63 Issue: 8 Pages: 1394-1399

    • DOI

      10.1002/pbc.26035

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] 炎症性腸疾患患者の血清中S100A8/A9の測定意義について-疾患の臨床的重症度との比較を通して2019

    • Author(s)
      岡田光貴、伊藤洋志、池本正生
    • Organizer
      第68回日本医学検査学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 遺伝子組み換えタンパク質によるマクロファージ機能の超制御機構とその臨床応用2018

    • Author(s)
      岡田 光貴、伊藤 洋志、池本 正生
    • Organizer
      第65回日本臨床検査医学会学術集会
    • Related Report
      2018 Research-status Report
  • [Remarks] 長浜バイオ大学 教員の研究紹介

    • URL

      https://www.nagahama-i-bio.ac.jp/research/%e6%95%99%e5%93%a1%e3%81%ae%e7%b4%b9%e4%bb%8b%ef%bc%88%e4%bc%8a%e8%97%a4-%e6%b4%8b%e5%bf%97%ef%bc%89/

    • Related Report
      2019 Annual Research Report
  • [Remarks] 長浜バイオ大学 教員の研究紹介

    • URL

      https://www.nagahama-i-bio.ac.jp/research/%E6%95%99%E5%93%A1%E3%81%AE%E7%B4%B9%E4%BB%8B%EF%BC%88%E4%BC%8A%E8%97%A4-%E6%B4%8B%E5%BF%97%EF%BC%89/

    • Related Report
      2018 Research-status Report
  • [Remarks] 長浜バイオ大学 教員の研究紹介

    • URL

      http://www.nagahama-i-bio.ac.jp/research/%E6%95%99%E5%93%A1%E3%81%AE%E7%B4%B9%E4%BB%8B%EF%BC%88%E4%BC%8A%E8%97%A4-%E6%B4%8B%E5%BF%97%EF%BC%89/

    • Related Report
      2017 Research-status Report
  • [Remarks] 長浜バイオ大学 教員の紹介(伊藤 洋志)

    • URL

      http://www.nagahama-i-bio.ac.jp/research/%E6%95%99%E5%93%A1%E3%81%AE%E7%B4%B9%E4%BB%8B%EF%BC%88%E4%BC%8A%E8%97%A4-%E6%B4%8B%E5%BF%97%EF%BC%89/

    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2021-02-19  

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