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Perivascular macrophages in the circumventricular organs have a role in immune-to-blood communication

Research Project

Project/Area Number 16K18980
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field General anatomy (including histology/embryology)
Research InstitutionNara Medical University

Principal Investigator

Morita Shoko  奈良県立医科大学, 医学部, 助教 (70647049)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords骨髄由来細胞 / エンドトキシン耐性 / インターロイキン1β / マクロファージ除去 / sickness behavior / IL-1β / 脳室周囲器官 / 炎症 / 血液脳関門 / マクロファージ / リポ多糖 / 炎症性サイトカイン
Outline of Final Research Achievements

Circulating endotoxins induce fever and decrease food and water intake, but pre-injection of endotoxins attenuates these changes. This phenomenon, known as endotoxin tolerance, can occur naturally in humans and is an important system for host protection against excessive response to endotoxin, clarifying the mechanisms for development of tolerance to endotoxins is needed. Here, we investigated feature of the circumventricular organs in endotoxin-non-tolerant and endotoxin-tolerant mice. Our data indicate that perivascular macrophages enable the circumventricular organs to produce inflammatory cytokine IL-1β in response to circulating endotoxins and that its hyporesponsiveness may be the cause of endotoxin tolerance.

Academic Significance and Societal Importance of the Research Achievements

一般に感染や炎症が生じた時には疲労感、抑うつ気分、摂食量や飲水量の低下などの防御反応が生じるが、エンドトキシンを繰り返し投与すると過剰反応から自己を守るために耐性が生じる。本研究ではエンドトキシン耐性のないマウスとあるマウスにエンドトキシンを投与して、脳でいち早くエンドトキシンを感知しsickness behaviorに関わる脳室周囲器官における反応を調べた。どちらのマウスでも血中のエンドトキシンは脳室周囲器官の血管周囲に侵入したが、耐性のないマウスで炎症性サイトカインを産生するマクロファージが、耐性のあるマウスでは産生しないことを示し、エンドトキシン耐性のメカニズムの一端を明らかにした。

Report

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

    (6 results)

All 2019 2018 2017 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results) (of which Invited: 1 results) Remarks (1 results)

  • [Journal Article] Responses of perivascular macrophages to circulating lipopolysaccharides in the subfornical organ with special reference to endotoxin tolerance.2019

    • Author(s)
      Morita-Takemura S, Nakahara K, Hasegawa-Ishii S, Isonishi A, Tatsumi K, Okuda H, Tanaka T, Kitabatake M, Ito T, Wanaka A.
    • Journal Title

      J Neuroinflammation

      Volume: 16 Issue: 1 Pages: 39-51

    • DOI

      10.1186/s12974-019-1431-6

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Blood-to-brain communication in the hypothalamus for energy intake regulation.2019

    • Author(s)
      Morita-Takemura S, Wanaka A.
    • Journal Title

      Neurochem Int.

      Volume: 128 Pages: 135-142

    • DOI

      10.1016/j.neuint.2019.04.007

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] 脳弓下器官のIL-1β産生における血管周囲マクロファージ様細胞の役割2018

    • Author(s)
      森田-竹村晶子、中原一貴、長谷川-石井さなえ、石西綾美、辰巳晃子、奥田洋明、田中達英、和中明生
    • Organizer
      第123回日本解剖学会総会・全国学術集会
    • Related Report
      2017 Research-status Report
  • [Presentation] 弓状核及び正中隆起における血中物質の到達と血管構築変化2017

    • Author(s)
      森田-竹村晶子
    • Organizer
      第122回日本解剖学会総会・全国学術集会
    • Place of Presentation
      長崎大学
    • Year and Date
      2017-03-28
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Immune cells in the perivascular space of the sensory circumventricular organs2017

    • Author(s)
      Shoko Morita-Takemura ・ Kazuki Nakahara ・ Kouko Tatsumi ・ Hiroaki Okuda ・ Tatsuhide Tanaka ・ Ayami Isonishi ・ Akio Wanaka
    • Organizer
      第40回日本神経科学大会
    • Related Report
      2017 Research-status Report
  • [Remarks] 奈良県立医科大学解剖学第二教室

    • URL

      http://www.naramed-u.ac.jp/~2ana/research.html

    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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