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Sepsis mouse model using TLR agonists: focuses on TLR7/8 and TLR9 ligands, immune tolerance state, and effects on lipid metabolism

Research Project

Project/Area Number 19K18336
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 55060:Emergency medicine-related
Research InstitutionTeikyo University

Principal Investigator

Seki Reiko  帝京大学, 医療技術学部, 講師 (30527495)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords炎症 / TLR / 敗血症 / 肝障害 / 脂質代謝 / トレランス / Toll like receptor / D-ガラクトサミン / マウス病態モデル / 炎症応答 / 肝不全 / 敗血症性ショック / 好中球
Outline of Research at the Start

感染により引き起こされる敗血症、またそれがさらに重篤化した敗血症性ショックは医療が進歩している現代でも致死率の高い病気のひとつです。その理由として、敗血症が多様な病態を示し、迅速な処置が必要であるにもかかわらず的確な治療法を見つけにくいことが挙げられます。そこで、マウスを用いて数種類の異なるToll様受容体アゴニスト(炎症を起こす細菌由来の様々な物質)が引き起こす炎症についてそれぞれの経時変化を調べ、どのような細胞あるいは機能が病態形成に関わっているのかを解明します。また、試薬の投与量や回数を変えることで敗血症の様々な状態のモデルを構築し、病気の多様性に対するメカニズムへの理解を深めます。

Outline of Final Research Achievements

To gain insights into the roles for neutrophils and platelets and the lipid metabolism in the liver, we used mice model in which a variety of TLR ligands causes systemic inflammation accompanied by liver injury. The following findings were obtained.
(1) Gr-1+ cells involving neutrophils have an anti-inflammatory and protective role in the systemic inflammation/liver dysfunction model. (2) CD36 gene expression is profoundly upregulated in the liver during the tolerance state during which the immune response is suppressed after the TLR ligand induced inflammation. (3) Acute stress causes upregulation of CD36 gene and a rapid initial decrease in serum triglyceride followed by a subsequent increase. (4) TLR agonists that induces liver dysfunction compromise the increase of the serum triglyceride after the initial decrease.
Taken together, these findings demonstrate a mechanism by which the lipid metabolism in the liver plays regulatory roles in inflammation and rapid immune response.

Academic Significance and Societal Importance of the Research Achievements

私たちは、敗血症でみられる免疫応答が弱くなっているトレランス状態や肝不全により炎症が増強されている状態、さらには拘束といった身体的なストレスにおいても、マウス肝臓の脂肪酸の取り込みに関するCD36遺伝子発現が迅速に著しく亢進することを見いだした。また血清TGの大きな変動を見いだし、肝臓の脂質代謝が炎症初期から大きく関与することを明らかにした。一方、TLRアゴニストはその変化を抑制することから細菌感染による敗血症増悪の過程を解明するヒントをつかむことができた。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2022 2021 2020 2019

All Journal Article (5 results) (of which Peer Reviewed: 2 results,  Open Access: 5 results)

  • [Journal Article] Regulation of Lipoprotein Lipase and Plasma Triglyceride in Acute Stress and Inflammation: Remaining Questions and Perspectives.2022

    • Author(s)
      Nishizawa K, Seki R
    • Journal Title

      Annals of Biomed Research

      Volume: 4 Pages: 1-4

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Lipid Metabolism and Mitochondrial Biogenesis in Septic Liver -A Mini Review Focuced on PGC-1α expression2021

    • Author(s)
      Nishizawa K and Seki R
    • Journal Title

      Annals of Biomedical Research

      Volume: 4 Pages: 1-7

    • Related Report
      2020 Research-status Report
    • Open Access
  • [Journal Article] Use of TLR9 and TLR7/8 agonists in combination with d-galactosamine in exploring models for distinct severities of systemic inflammation relative to liver injury2020

    • Author(s)
      Seki R、Nishizawa K
    • Journal Title

      Physiological Research

      Volume: 69 Pages: 1125-1129

    • DOI

      10.33549/physiolres.934455

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Shikonin: a review with a focus on anti-inflammatory and anti-cancer mechanisms2019

    • Author(s)
      R Seki,K Nishizawa
    • Journal Title

      Annals of Biomedical Research

      Volume: 2 Pages: 1-11

    • Related Report
      2019 Research-status Report
    • Open Access
  • [Journal Article] Neutrophil Extracellular Trap Formation after Sterile Insults in Lung, Liver, Heart and Kidney: A mini-Review2019

    • Author(s)
      R Seki,K Nishizawa
    • Journal Title

      Annals of Biomedical Research

      Volume: 2 Pages: 1-12

    • Related Report
      2019 Research-status Report
    • Open Access

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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