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Mechanism of methionine accumulation in epileptogenic lesions

Research Project

Project/Area Number 16K10793
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Neurosurgery
Research InstitutionKagoshima University

Principal Investigator

HANAYA Ryosuke  鹿児島大学, 医歯学域医学系, 准教授 (60304424)

Co-Investigator(Kenkyū-buntansha) 米澤 大  鹿児島大学, 医歯学域附属病院, 助教 (50550076)
細山 浩史  鹿児島大学, 医歯学域医学系, 助教 (70593648)
有田 和徳  鹿児島大学, 医歯学総合研究科, 客員研究員 (90212646)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsメチオニン / PET / てんかん原性領域 / 皮質形成異常 / 結節性硬化症 / メチオニンPET / 皮質形成異常症 / 薬剤抵抗性てんかん / ミクログリア / Methionine / 11C-Methionine PET / てんかん / 原性領域推定 / 難治性てんかん / メチオニン集積
Outline of Final Research Achievements

In patients with drug-resistant epilepsy caused by tuberous sclerosis and focal cortical dysplasia / unilateral megancephalopathy, methionine accumulated in the estimated epileptogenic area in about 60% and 90% of the patients, respectively. In the patients with tuberous sclerosis without methionine accumulation, the epileptogenic area could not be identified even by the other tests. In the patients without epilepsy, there was no accumulation of methionine in the lesion. All patients with drug-resitant epilepsy accompanied by methionine accumulation had resecive surgery. The seizures were disappeared or significantly reduced at the second year after operation, in cases where the methionine accumulation lesion could be completely removed. Resected tissue study indicated that Iba-1 positive cells increased in the high accumulation group compared to the methionine non-accumulation group, and all of which were accompanied by accumulation of active microglia.

Academic Significance and Societal Importance of the Research Achievements

発作間歇期のてんかん焦点同定法として、核医学検査による糖代謝や脳血流評価は有用なツールである。これらのトレーサーはてんかん原性領域を集積低下として呈する。正常組織と比べて元々糖代謝や脳血流が低下している結節性硬化症の大脳皮質結節のような病変では、複数の結節が存在する場合にいずれの病変も集積低下を示す。そのため、てんかん焦点同定における診断的意義は高いとは言えない。発作時脳血流SPECTはてんかん原性領域で高集積を呈するが、この検査を行うには多くの労力を要する。発作間歇期に集積亢進を示すメチオニンPETは、こうした複数病変を有する形成異常症におけるてんかん原性領域同定において有用性が非常に高い。

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 2016

All Presentation (6 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] 11C-Methionine PETを用いたてんかん原性領域推定と術後発作転帰2019

    • Author(s)
      花谷亮典 大坪俊昭 細山浩史 丸山慎介 佐藤雅紀 樫田祐美 有田和徳 吉本幸司
    • Organizer
      第42回日本てんかん外科学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Long-term outcome of epilepsy surgery in pediatric patients2018

    • Author(s)
      Ryosuke Hanaya, Hiroshi Hosoyama
    • Organizer
      12th Asian Epilepsy Surgery Congress
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] てんかん原性領域推定における11C-Methionine PETの有用性とその特徴2018

    • Author(s)
      花谷亮典
    • Organizer
      第41回日本CI学会
    • Related Report
      2017 Research-status Report
  • [Presentation] 皮質病変を伴う難治性てんかん患者における11C-Methionine PETの集積亢進2017

    • Author(s)
      花谷亮典
    • Organizer
      第40回日本CI学会
    • Place of Presentation
      鹿児島サンロイヤルホテル(鹿児島県鹿児島市)
    • Year and Date
      2017-03-03
    • Related Report
      2016 Research-status Report
  • [Presentation] 11C-Methionine PET shows accumulation of Methionine in epileptogenic zone in patients with intractable neocortical epilepsy2017

    • Author(s)
      Kazunori Arita
    • Organizer
      American Epilepsy Society Annual Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Availability of 11C-Methionine PET to detect epileptogenic lesion2016

    • Author(s)
      Ryosuke Hanaya
    • Organizer
      11th Asian & Oceanian Epilepsy Congress
    • Place of Presentation
      Hong Kong Convention and Exhibition Centre(中華人民共和国香港特別行政区)
    • Year and Date
      2016-05-13
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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

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