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The regulation of blood-brain barrier permeability of ketone bodies in ketogenic diet.

Research Project

Project/Area Number 20K07745
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 51030:Pathophysiologic neuroscience-related
Research InstitutionJikei University School of Medicine

Principal Investigator

Kawamura Masahito  東京慈恵会医科大学, 医学部, 准教授 (10408388)

Co-Investigator(Kenkyū-buntansha) 西 晴久  東京慈恵会医科大学, 医学部, 講師 (70256428)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsketogenic diet / 小児てんかん / 抗けいれん作用 / ケトン食療法 / アデノシン受容体 / 血液脳関門 / ケトン体 / 血糖
Outline of Research at the Start

ケトン食療法は小児てんかんに用いられる、けいれんを抑えるための食事療法である。近年、薬剤が効きにくいてんかんにも効果が期待できることから注目されている。しかしながらケトン食療法は、その効果が発揮されるまでに最大で1ヶ月もの時間がかかることが知られている。本研究では、ケトン食療法の効果発現までに時間がかかる原因を明かにすることを目的とする。本研究の成果は、ケトン食療法を新規に始める患者さんがその効果発現を待たなければならない時間を短くし、その苦痛を少しでも和らげることに寄与すると考えられる。

Outline of Final Research Achievements

A ketogenic diet increases ketone bodies in the blood and has been used successfully to treat pediatric epilepsy by mimicking fasting. However, ketogenic diet has the disadvantage that it takes longer to cause antiepileptic effects than fasting. To elucidate the reason for this discrepancy, we examined biokinetics of ketone bodies underlies ketogenic diet and fasting. The ketogenic diet took longer than fasting for the onset of anticonvulsant effects and the increase in cerebrospinal fluid concentrations of ketone body. On the other hand, blood concentrations of ketone body were significantly lower during ketogenic diet than during fasting. The permeability of ketone body was low in the cultured cell model of the blood-brain barrier. The lower increase in blood ketone concentrations during ketogenic diet than during fasting and the low blood-brain barrier permeability of ketone bodies might delay the time to onset of anticonvulsant effects.

Academic Significance and Societal Importance of the Research Achievements

ケトン食療法は薬剤耐性てんかんに対しても有用であることが示されている。また近年は、自閉症スペクトラム障害や統合失調症などの難治性中枢神経系疾患への治療効果も示唆されており、小児てんかん以外への適応拡大も期待されている。ケトン食療法におけるケトン体の中枢移行性を含めた体内動態を解明することは、難治性中枢神経系疾患に対するケトン食療法の適応拡大への一助になるだけでなく、脳内のエネルギー供給経路を理解するために重要な基盤研究となる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (4 results)

All 2022 2021 2020

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

  • [Journal Article] Adenosine A1 receptor antagonist-induced facilitation of postsynaptic AMPA currents in pyramidal neurons of the rat hippocampal CA2 area2022

    • Author(s)
      Kawamura Masahito、Sekino Yuko
    • Journal Title

      Purinergic Signalling

      Volume: - Issue: 4 Pages: 623-632

    • DOI

      10.1007/s11302-022-09897-9

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Leucine-Enriched Essential Amino Acids Enhance the Antiseizure Effects of the Ketogenic Diet in Rats2021

    • Author(s)
      Takeuchi Fumika、Nishikata Natsumi、Nishimura Mai、Nagao Kenji、Kawamura Masahito
    • Journal Title

      Frontiers in Neuroscience

      Volume: 15 Pages: 637288-637288

    • DOI

      10.3389/fnins.2021.637288

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Adenosine and Ketogenic Treatments2020

    • Author(s)
      Ruskin David N.、Kawamura Masahito、Masino Susan A.
    • Journal Title

      Journal of Caffeine and Adenosine Research

      Volume: 10 Issue: 3 Pages: 104-109

    • DOI

      10.1089/caff.2020.0011

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Book] Ketogenic Diet and Adenosine in Epilepsy - Models and Mechanisms. In: Ketogenic Diet and Metabolic Therapies Expanded Roles in Health and Disease (Susan A. Masino, ed).2022

    • Author(s)
      Masahito Kawamura Jr. (分担執筆)
    • Total Pages
      15
    • Publisher
      OXFORD UNIVERSITY PRESS
    • ISBN
      9780197501207
    • Related Report
      2021 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

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