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Clinical study of pathogenic mechanism of minimal hepatic encephalopathy using ultra-high magnetic field 7 Tesla MRI

Research Project

Project/Area Number 15K19346
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Gastroenterology
Research InstitutionIwate Medical University

Principal Investigator

SAWARA KEI  岩手医科大学, 医学部, 非常勤医師 (40405816)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsミニマル肝性脳症 / カルニチン / グルタミン / ミオイノシトール / MRI / MRS / DKI / mean kurtosis (MK) / アンモニア / NPテスト
Outline of Final Research Achievements

Compared with liver cirrhosis patients without minimal hepatic encephalopathy (non MHE), liver cirrhosis patients with minimal hepatic encephalopathy (MHE) showed marked increase in glutamine in the brain and decrease in myoinositol in the brain. We examined the predictors of onset of MHE, showed that elevated blood ammonia levels, the ratio of total serum carnitine to serum acylcarnitine (Ac-CA / T-CA ratio), elevated levels of creatine, and decreased levels of eGFR are predictors. We measured diffusion kurtosis imaging (DKI) in the brain and found that mean kurtosis (MK) decreased in putamen in the MHE group compared to the non MHE group. From these results, we considered that the elucidation of pathogenic mechanism of MHE has been advanced one step further.

Academic Significance and Societal Importance of the Research Achievements

肝硬変患者において肝性脳症は重篤な合併症であり、その前段階であるミニマル肝性脳症は記憶力や集中力の低下を招き交通違反や交通事故にも繋がる可能性があり、今後大きな社会的問題となることが示唆されている。従いミニマル肝性脳症の病態を解明し、早期に診断することは非常に重要である。本研究では、ミニマル肝性脳症発症予測因子を検討し、高磁場MRIを用いて脳内の微細な変化を捉え、新たな知見が得られたことによりミニマル肝性脳症の病態を解明、早期診断に寄与したと考えられ、学術的、社会的に大きな意義があったと考えられる。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (9 results)

All 2019 2018 2017 2016 2015

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (2 results) (of which Int'l Joint Research: 1 results) Book (2 results)

  • [Journal Article] Decreased Mean Kurtosis in the Putamen is a Diagnostic Feature of Minimal Hepatic Encephalopathy in Patients with Cirrhosis2019

    • Author(s)
      Sato Takuro、Endo Kei、Kakisaka Keisuke、Suzuki Yuji、Kooka Yohei、Sawara Kei、Ito Kenji、Sasaki Makoto、Takikawa Yasuhiro
    • Journal Title

      Internal Medicine

      Volume: 58 Issue: 9 Pages: 1217-1224

    • DOI

      10.2169/internalmedicine.2116-18

    • NAID

      130007641555

    • ISSN
      0918-2918, 1349-7235
    • Year and Date
      2019-05-01
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] L-carnitine prevents ammonia-induced cytotoxicity and disturbances in intracellular amino acid levels in human astrocytes2018

    • Author(s)
      Wang Ting、Suzuki Kazuyuki、Kakisaka Keisuke、Onodera Mio、Sawara Kei、Takikawa Yasuhiro
    • Journal Title

      Journal of Gastroenterology and Hepatology

      Volume: - Issue: 7 Pages: 1249-1255

    • DOI

      10.1111/jgh.14497

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Updating the neuropsychological test system in Japan for the elderly and in a modern touch screen tablet society by resetting the cut-off values.2017

    • Author(s)
      Kawaguchi T, Konishi M, Kato A, Kato M, Kooka Y, Sawara K, et.AL
    • Journal Title

      Hepatol Research

      Volume: 47 Issue: 12 Pages: 1335-1339

    • DOI

      10.1111/hepr.12864

    • Related Report
      2017 Research-status Report 2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Brain metabolism in minimal hepatic encephalopathy assessed by 3.0-Tesla magnetic resonance spectroscopy2016

    • Author(s)
      Kooka Yohei, Sawara Kei, Endo Rujin, Kato Akinobu, Suzuki Kazuyuki, Takikawa Yasuhiro.
    • Journal Title

      Hepatol Reserch

      Volume: 46 Issue: 4 Pages: 269-76

    • DOI

      10.1111/hepr.12519

    • Related Report
      2016 Research-status Report 2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] Predictive biomarkers for diagnosis of minimal hepatic encephalopathy in patients with liver cirrhosis: A preliminary result in a single center study in Japan2016

    • Author(s)
      Kazuyuki Suzuki、Hidekatsu Kuroda、Kei Sawara et al.
    • Journal Title

      Biomedical Research and Clinical Practice

      Volume: 1 Issue: 3 Pages: 97-102

    • DOI

      10.15761/brcp.1000117

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] BRAIN METABOLISM IN PATIENTS WITH MINIMAL HEPATIC ENCEPHALOPATHY ON 3.0-TESLA MAGNETIC RESONANCE SPECTROSCOPY2017

    • Author(s)
      Kei Sawara
    • Organizer
      国際肝性脳症窒素代謝学会  ISHEN 2017
    • Place of Presentation
      インド ニューデリー
    • Year and Date
      2017-03-09
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] BRAIN METABOLISM IN PATIENTS WITH MINIMAL HEPATIC ENCEPHALOPATHY ON 3.0-TESLA MAGNETIC RESONANCE SPECTROSCOPY2015

    • Author(s)
      Sawara Kei
    • Organizer
      UEGW 2015
    • Place of Presentation
      バルセロナ スペイン
    • Year and Date
      2015-10-24
    • Related Report
      2015 Research-status Report
  • [Book] The Liver in Systemic Diseases, Chapter 5 The Brain and Liver2016

    • Author(s)
      Kei Sawara,Hidekatu kuroda,Yasuhiro Takikawa
    • Total Pages
      10
    • Publisher
      Springer
    • Related Report
      2015 Research-status Report
  • [Book] 消化器疾患最新の治療2015-2016 [Ⅳ-A-10-b 反復性脳症]2015

    • Author(s)
      佐原 圭
    • Total Pages
      4
    • Publisher
      南江堂
    • Related Report
      2015 Research-status Report

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Published: 2015-04-16   Modified: 2020-03-30  

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