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Elucidation of the cause of phenotypic differences in tuberous sclerosis complex using model mice

Research Project

Project/Area Number 21K08322
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53050:Dermatology-related
Research InstitutionOsaka University

Principal Investigator

Koike-Kumagai Makiko  大阪大学, 大学院医学系研究科, 寄附講座助教 (30391949)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords結節性硬化症(TSC) / 結節性硬化症関連精神神経障害(TAND) / TSCモデルマウス / 行動解析 / ミクログリア / ERα / シロリムス / mTOR / 結節性硬化症 / エストロゲン / ラパマイシン / 神経皮膚症候群 / てんかん / mTORC1
Outline of Research at the Start

結節性硬化症(TSC)は、皮膚と神経系を中心に異常が現れる遺伝性の「神経皮膚症候群 」である。てんかん発作や発達障害の罹患率が高く、患者のQOLに影響を与える。TSCでは、Tsc1/Tsc2遺伝子の機能低下によるmTORキナーゼの過剰な活性化が原因と考えられている。一方で、症状の個人差が大きいことが治療を難しくしているが、その原因は不明である。本研究では、TSCモデルマウスを用いてミクログリアと、転写因子として機能するステロイドホルモン受容体についての解析を行い、症状の個人差の原因を追究することを目的とする。さらに、皮膚細菌叢解析により、異なった視点から病態の解明と新しい治療法の開拓を目指す。

Outline of Final Research Achievements

TSC is a disease characterized by abnormalities mainly in the skin and nervous system; the neuropsychiatric disorder of TSC is called TAND. sirolimus, an mTOR inhibitor, was found to improve TAND in a mouse model of TSC. We also found that microglial polarity changes are involved in the pathogenesis of TAND and that sirolimus treatment shifts microglia to an anti-inflammatory state. We also found sex differences in TAND in these mice and attributed the sex difference to the transcriptional activation by estrogen (E2) and ERα in the brain. We found that sirolimus has steroid-modulating properties and that sirolimus treatment leads to improvement in TAND by regulating the transcriptional activity of E2 and ERα through modulation of steroid levels in the brain.

Academic Significance and Societal Importance of the Research Achievements

TSCは、てんかん発作や発達障害の罹患率が高く、 患者のQOLに影響を与えることが問題となっている。TSCでは、mTORキナーゼの過剰な活性化が原因と考えられており、mTOR阻害剤の有効性は、臨床的にも認知されつつあるが、いまだ病態形成の機序が十分に解明されているとはいいがたい。我々の研究成果は、TSCの病態機序をさらに明らにするとともに、シロリムスがステロイドレベルを調節するという新たな機能を見出したことである。神経精神疾患やアルツハイマー病を代表とする神経変性疾患にも性差が認められており、シロリムスがTANDだけでなく、性差のある疾患における突破口となる可能性がある。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Sirolimus relieves seizures and neuropsychiatric symptoms via changes of microglial polarity in tuberous sclerosis complex model mice2022

    • Author(s)
      Makiko Koike-Kumagai, Manabu Fujimoto, Mari Wataya-Kaneda
    • Journal Title

      Neuropharmacology

      Volume: 218 Pages: 1-16

    • DOI

      10.1016/j.neuropharm.2022.109203

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Neuroinflammation and Microglial Polarity: Sirolimus Shifts Microglial Polarity to M2 phenotype in a Mouse Model of Tuberous Sclerosis Complex2022

    • Author(s)
      Makiko Koike-Kumagai, Mari Wataya-Kaneda
    • Journal Title

      J. Exp. Neurol.

      Volume: 3 Issue: 2 Pages: 63-70

    • DOI

      10.33696/neurol.3.064

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Sirolimus alters microglial polarity leading to improvement of neuropsychiatric symptoms of tuberous sclerosis complex mice model.2023

    • Author(s)
      Makiko Koike-Kumagai, Mari Wataya-Kaneda
    • Organizer
      1 st. International Conference of Neuroscience and Neurology.
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Epilepsy and TAND in the tuberous sclerosis complex are caused by an alteration in microglial polarity to M1 and sirolimus cures them by returning microglial polarity to M2.2023

    • Author(s)
      Emi Kaneda, Makiko Koike-Kumagai and Mari Wataya-Kaneda
    • Organizer
      2023 International TSC Research Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The microglial decreased phagocytosis in olfactory bulb is responsible for neuropsychiatric disorders in tuberous sclerosis complex model mice.2021

    • Author(s)
      Makiko Koike-Kumagai
    • Organizer
      50 th Annual ESDR meeting, Virtual, Sep. 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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