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Usefulness of AST and ALT measurement using pyridoxal phosphate in patients with vitamin B6 deficiency.

Research Project

Project/Area Number 19K16961
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 52010:General internal medicine-related
Research InstitutionJuntendo University

Principal Investigator

Idei Mayumi  順天堂大学, 医学部, 准教授 (40596623)

Project Period (FY) 2019-04-01 – 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 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsトランスアミナーゼ / ビタミンB6 / ピリドキサールリン酸
Outline of Research at the Start

肝障害のマーカーであるAST、ALTはビタミンB6の活性型であるピリドキサールリン酸を補酵素とする。ビタミンB6欠乏状態では、ピリドキサールリン酸を添加しない日本の測定法では、血清AST、ALTが見かけ上低値となり、肝障害を過小評価する可能性がある。本研究では、ビタミンB6欠乏患者を対象に、ピリドキサールリン酸を添加した測定系でAST、ALTを測定し、その有用性を検証する。

Outline of Final Research Achievements

AST and ALT activities are widely measured using the JSCC methods without addition of pyridoxal phosphate (PALP) in Japan. This study investigated the usefulness of AST and ALT measurement using the IFCC method with addition of PALP in patients with vitamin B6 deficiency. The measurement of AST using the IFCC method was unstable, therefore, ALT was investigated. Patients with low vitamin B6 levels had a higher rate of low ALT activities, and the ALT increase rate ((IFCC-JSCC)/JSCC) was significantly higher in the low ALT group than in control group. This suggests the usefulness of ALT measurement using the IFCC method with addition of PALP in patients with low ALT activities. In this study, the increase in ALT activities measured by the IFCC method did not significantly affect the assessment of liver damage.

Academic Significance and Societal Importance of the Research Achievements

AST、ALTの測定は、国際臨床化学連合の勧告法(IFCC法)ではPALPを添加し測定されるが、国際的にはPALPを添加することは統一されていない。本邦では、PALP非添加のJSCC標準化準拠法(JSCC法)で測定することが一般的であり、ビタミンB6欠乏状態では、AST、ALTが見かけ上低値となり、肝障害を過小評価する可能性がある。本研究により、ビタミンB6低値ではALT低値の割合が高く、ALT低値例において、IFCC法測定の有用性が示された。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2022 2021 2019

All Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] 血清ビタミンB6 濃度低値と関連する因子の検討2022

    • Author(s)
      出居真由美, 山本剛正,田中君枝,山谷琴子,箕輪健太郎,中田純一郎,松山秀二郎,堀口園子,脇田満,平山哲,三宅一徳,三井田孝
    • Organizer
      第62回日本臨床化学会年次学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] Alanine aminotransferase(ALT)とビタミンB6濃度の関連2021

    • Author(s)
      出居真由美, 山本剛正, 堀敦詞, 田中君枝, 脇田満, 平山哲, 山谷琴子, 上野剛, 箕輪健太郎, 中田純一郎, 松山秀二郎, 三宅一徳, 三井田孝
    • Organizer
      第68回日本臨床検査医学会学術集会
    • Related Report
      2021 Research-status Report
  • [Presentation] 妊婦におけるJSCC法とIFCC法によるトランスアミナーゼ活性値の比較2019

    • Author(s)
      出居真由美,上野剛,西岡笑子,牧野真太郎,平山哲,一色美和,堀内裕紀,三宅一徳,三井田孝
    • Organizer
      第59回日本臨床化学会年次学術集会
    • Related Report
      2019 Research-status Report
  • [Presentation] ERC/mesothelin is associated with peritoneal deterioration in peritoneal dialysis patients2019

    • Author(s)
      Idei M,Hamada C,Tabe Y,Abe M,Miyake M,Hino M,Miida T
    • Organizer
      The 9th Asia Pacific Chapter Meeting of International Society for Peritoneal Dialysis
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] A cross-sectional study on health-related qualtity of life with combined dialysis compared to hemodialysis and peritoneal dialysis2019

    • Author(s)
      Tanaka M,Ishibashi Y,Hamasaki Y,Kamijo Y,Idei M,Nishi T,Takeda M,Nonaka H,Nakagawa J,Atsumi K,Matsumoto A,Yamakawa H,Tomita Y,Nangaku M,Mise N
    • Organizer
      The 9th Asia Pacific Chapter Meeting of International Society for Peritoneal Dialysis
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2025-01-30  

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