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Elucidation of the intracellular mechanism that controls TAG accumulated in host cells containing Mycobacterium leprae

Research Project

Project/Area Number 18K15150
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49050:Bacteriology-related
Research InstitutionTeikyo University

Principal Investigator

TANIGAWA KAZUNARI  帝京大学, 薬学部, 助教 (10443110)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsハンセン病 / らい菌 / 抗酸菌 / 脂質 / triacylglycerol / lipid droplet / GPAT3 / マクロファージ / M. leprae
Outline of Final Research Achievements

In this study, we attempted to determine the intracellular lipid composition and underlying mechanisms for changes in host cell lipid metabolism induced by M. leprae infection. Using HPTLC, we demonstrated specific induction of TAG production in human macrophage THP-1 cells following M. leprae infection. We then used [14C] stearic acid tracing to show incorporation of this newly synthesized host cell TAG into M. leprae. In parallel with TAG accumulation, expression of host GPAT3, a key enzyme in de novo TAG synthesis, was significantly increased in M. leprae-infected cells. CRISPR/Cas9 genome editing of GPAT3 in THP-1 cells (GPAT3 KO) dramatically reduced accumulation of TAG following M. leprae infection, intracellular mycobacterial load, and bacteria viability. These results together suggest that M. leprae induces host GPAT3 expression to facilitate TAG accumulation within macrophages to maintain a suitable environment that is crucial for intracellular survival of these bacilli.

Academic Significance and Societal Importance of the Research Achievements

ハンセン病は未だ世界で年間20万人以上の新規患者が発症する重要な感染症である。WHOが推進する多剤併用療法(MDT)によって菌の排除は望めるが、薬剤耐性菌も出現しており、経過中や治療によって死滅した菌体成分に対する急性のアレルギー性反応である「らい反応」が出現するなど、治療が困難な疾患である。そのため、抗菌薬に変わるマイルドな治療戦略が求められている。その点に関して、我々は、宿主細胞内の環境をターゲットにした戦略を提案するものである。すなわち、宿主への脂質の蓄積をコントロールすることで宿主由来の免疫応答を生かして排除することが期待される。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (13 results)

All 2021 2020 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] Mycobacterium leprae promotes triacylglycerol de novo synthesis through induction of GPAT3 expression in human premonocytic THP-1 cells.2021

    • Author(s)
      Tanigawa K, Hayashi Y, Hama K, Yamashita A, Yokoyama K, Luo Y, Kawashima A, Maeda Y, Nakamura Y, Harada A, Kiriya M, Karasawa K, Suzuki K.
    • Journal Title

      PLoS One

      Volume: 16 Issue: 3 Pages: 1-16

    • DOI

      10.1371/journal.pone.0249184

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] らい菌が宿主マクロファージに蓄積するtriacylglycerolを利用している可能性2021

    • Author(s)
      谷川和也、林康広、濱弘太郎、山下純、横山和明、Yuqian Luo、川島晃、中村康宏、原田史子、桐谷光夫、唐澤健、鈴木幸一
    • Organizer
      日本薬学会141年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 偏性細胞内寄生細菌であるらい菌は宿主マクロファージのGPAT3発現を介したTAG合成を利用して生存を維持する2020

    • Author(s)
      谷川和也、林康広、濱弘太郎、川島晃、Yuqian Luo、桐谷光夫、中村康宏、唐澤健、鈴木幸一
    • Organizer
      第61回日本組織細胞化学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] らい菌はtriacylglycerolの代謝物である脂肪酸を膜脂質に利用する2020

    • Author(s)
      谷川和也、林康広、濱弘太郎、川島晃、Yuqian Luo、桐谷光夫、中村康宏、原田史子、唐澤健、鈴木幸一
    • Organizer
      第4回日本ワンヘルスサイエンス学会大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 偏性細胞内寄生細菌であるらい菌の生存には宿主細胞内GPAT3発現が必要である2020

    • Author(s)
      谷川和也
    • Organizer
      日本薬学会第140年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Mycobacterium leprae-induced TAG accumulation is caused by increased expression of GPAT3 in host macrophages2019

    • Author(s)
      Kazunari Tanigawa
    • Organizer
      20th International Leprosy Congress
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mycobacterium leprae-induced foam cell formation via peroxisome proliferator-activated receptor (PPAR)-delta and PPAR-gamma in host2019

    • Author(s)
      Akira Kawashima
    • Organizer
      20th International Leprosy Congress
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] M. leprae infection induced GPAT3 expression and accumulated TAG species in host macrophages2019

    • Author(s)
      Kazunari Tanigawa
    • Organizer
      60th International Conference on the Bioscience of Lipids
    • Related Report
      2019 Research-status Report 2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 宿主マクロファージにおけるGPAT3のらい菌感染への影響2019

    • Author(s)
      谷川和也
    • Organizer
      日本薬学会第139年会
    • Related Report
      2019 Research-status Report 2018 Research-status Report
  • [Presentation] Mycobacterium leprae-induced TAG accumulation is caused by increased expression of GPAT3 in host macrophages2019

    • Author(s)
      Kauznari Tanigawa
    • Organizer
      20th International Leprosy Congress
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mycobacterium leprae-induced foam cell formation via peroxisome proliferator-activated receptor (PPAR)- and PPAR-g in host2019

    • Author(s)
      Akira Kawashima
    • Organizer
      20th International Leprosy Congress
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] GPAT3はらい菌感染マクロファージにおいてTAG合成を促す2018

    • Author(s)
      谷川和也
    • Organizer
      日本薬学会第138年会
    • Related Report
      2018 Research-status Report
  • [Presentation] らい菌感染マクロファージに蓄積する脂質の解析2018

    • Author(s)
      谷川和也
    • Organizer
      第60回日本脂質生化学会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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