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Analysis of metabolic adaptation to omega-3 fatty acid deficiency in the liver

Research Project

Project/Area Number 18K08495
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 54040:Metabolism and endocrinology-related
Research InstitutionTokyo Medical and Dental University (2020)
National Center for Global Health and Medicine (2018-2019)

Principal Investigator

Daisuke Hishikawa  東京医科歯科大学, 統合研究機構, プロジェクト助教 (10569966)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsドコサヘキサエン酸 / オメガ3脂肪酸 / 脂質代謝 / 生体膜リン脂質 / 多価不飽和脂肪酸 / 肝臓 / DHA / リゾリン脂質アシル転移酵素 / 脂質代謝異常症
Outline of Final Research Achievements

Docosahexaenoic acid (DHA), an omega-3 polyunsaturated fatty acid, plays essential roles in mammals, and its deficiency causes abnormalities in spermatogenesis, visual, and neuronal function. However, mammals cannot produce DHA themselves de novo, thus it is necessary to obtain it from dietary sources. In this study, we investigated the hepatic metabolic changes under DHA deficiency using mice deficient in AGPAT3, a critical enzyme for DHA-containing phospholipid biosynthesis. Our results showed that DHA deficiency is recognized in the hepatocytes and leads to compensatory increase of other polyunsaturated fatty acid through SREBP1-dependent induction of polyunsaturated fatty acid synthesis related genes.

Academic Significance and Societal Importance of the Research Achievements

ドコサヘキサエン酸(DHA)は主要なオメガ3脂肪酸の1つで、脳機能や精子形成、視覚機能などに必須の役割を有することが知られている。しかしながらヒトを含む哺乳動物はDHAを生体内で合成することができないため、食事から摂取する必要がある。過去の研究からDHA欠乏における生体機能の異常については明らかにされてきたが、DHA欠乏時の生体の適応機構については不明な点が多く残されている。本研究は、DHA欠乏は肝臓において認識されること、また肝臓においてDHA欠乏時には代償的に他の多価不飽和脂肪酸を増加させ、全身の組織に供給する機構があることを明らかにした。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (3 results)

All 2021 2020 2019

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

  • [Journal Article] Hepatic Levels of DHA-Containing Phospholipids Instruct SREBP1-Mediated Synthesis and Systemic Delivery of Polyunsaturated Fatty Acids2020

    • Author(s)
      Hishikawa Daisuke、Yanagida Keisuke、Nagata Katsuyuki、Kanatani Ayumi、Iizuka Yoshiko、Hamano Fumie、Yasuda Megumi、Okamura Tadashi、Shindou Hideo、Shimizu Takao
    • Journal Title

      iScience

      Volume: 23 Issue: 9 Pages: 101495-101495

    • DOI

      10.1016/j.isci.2020.101495

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] DHA含有リン脂質の生体における意義2021

    • Author(s)
      菱川大介
    • Organizer
      第7回 JFAS
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] DHA欠乏時の肝臓における多価不飽和脂肪酸の維持機構2019

    • Author(s)
      菱川大介、叶谷愛弓、進藤英雄、清水孝雄
    • Organizer
      日本脂質生化学会
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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