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Inhibitory mechanism of obesity-induced hepatocellular carcinoma by the novel fatty acid metabolized by intestinal microbiota

Research Project

Project/Area Number 20K16121
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 48020:Physiology-related
Research InstitutionOsaka Metropolitan University (2022)
Osaka City University (2020-2021)

Principal Investigator

Tomonori Kamiya  大阪公立大学, 大学院医学研究科, 助教 (80823682)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords肥満誘導性肝がん / 腸内細菌 / 脂質 / 肥満 / 肝臓 / がん / リノール酸 / 肝癌 / 細胞老化 / NASH / 肝がん / 脂肪酸
Outline of Research at the Start

腸内細菌は同じ物質を宿主とは異なる経路にて代謝する。腸内細菌代謝系に変化が生じると疾患発症のリスクとなることが、そのメカニズムについてはほとんど解明されていない。腸内細菌の代謝物が肝癌を誘発し、肝臓が代謝する脂質が抗腫瘍免疫を抑制する。そこで、宿主と腸内細菌の代謝の不均衡が肝癌誘発に繋がると考え、両者の代謝系が知られているリノール酸(LA)に着目した。我々は、低濃度LA食では高頻度に肝癌が形成され、高濃度LA食では肝癌が抑制される知見を得た。本研究では、LAによる肝癌抑制メカニズムの解明を目的とした。宿主と腸内細菌の代謝関係を明らかにし、ヒト肝癌発症メカニズムの解明や治療法の開発に繋げる。

Outline of Final Research Achievements

When a high-fat diet (HFD) containing high linoleic acid (LA) is fed on mouse models for obesity-induced hepatocellular carcinoma, the fatty liver was less formed, and the number of HCC was significantly reduced. In this study, we focused on the function of intestinal microbiota in elucidating this phenomenon. LA metabolites produced by intestinal microbiota were detected in the liver of high LA-HFD mice, and the metabolizing enzymes and bacteria were identified. And then we succeeded in developing HFD containing the bacterial metabolite of LA. On the other hand, the removal of intestinal microbiota by antibiotic administration or the HFD containing the above LA metabolite did not explain the changes in fatty liver and tumor formation caused by high LA-HFD, and we concluded that the mechanism is not mediated by intestinal microbiota.

Academic Significance and Societal Importance of the Research Achievements

近年、国内の食文化の変化による肥満関連疾患が増え、肥満は糖尿病や脳血管性疾患、心筋梗塞のみならず、肝がんなどの様々ながんのリスクファクターであると明らかとなった。肥満による脂肪肝は肝がん発生にまで悪化することから、発症メカニズムの解明や治療法の確立が課題である。我々は、摂取する脂肪の質を変化させることで、脂肪肝が抑制されることを見出しており、そのメカニズムを解明することは、現代病である脂肪肝を予防するアプローチを生み出すことができると考えた。研究結果としては、腸内細菌を介さなかったが、将来展望としては、脂質の取り込みや肝臓での脂質代謝により起きた現象と予想し、研究の展開が期待される。

Report

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

    (9 results)

All 2022 2021 2020

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (4 results) (of which Int'l Joint Research: 1 results) Patent(Industrial Property Rights) (1 results) (of which Overseas: 1 results)

  • [Journal Article] Distinct responsiveness to rifaximin in patients with hepatic encephalopathy depends on functional gut microbial species2022

    • Author(s)
      Yukawa-Muto Y, Kamiya T, Fujii H, Mori H, Toyoda A, Sato I, Konishi Y, Hirayama A, Hara E, Fukuda S, Kawada N, Ohtani N
    • Journal Title

      Hepatol Commun

      Volume: 6 Issue: 8 Pages: 2090-2104

    • DOI

      10.1002/hep4.1954

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Galectin-3 promotes the adipogenic differentiation of PDGFRα+ cells and ectopic fat formation in regenerating muscle2022

    • Author(s)
      Takada Naoki、Takasugi Masaki、Nonaka Yoshiki、Kamiya Tomonori、Takemura Kazuaki、Satoh Junko、Ito Shinji、Fujimoto Kosuke、Uematsu Satoshi、Yoshida Kayo、Morita Takashi、Nakamura Hiroaki、Uezumi Akiyoshi、Ohtani Naoko
    • Journal Title

      Development

      Volume: 149 Issue: 3 Pages: 1-13

    • DOI

      10.1242/dev.199443

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bioinformatics Analysis of Oral, Vaginal, and Rectal Microbial Profiles during Pregnancy: A Pilot Study on the Bacterial Co-Residence in Pregnant Women2021

    • Author(s)
      Fudaba Megumi、Kamiya Tomonori、Tachibana Daisuke、Koyama Masayasu、Ohtani Naoko
    • Journal Title

      Microorganisms

      Volume: 9 Issue: 5 Pages: 1027-1027

    • DOI

      10.3390/microorganisms9051027

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Visualization of quantitative lipid distribution in mouse liver through near-infrared hyperspectral imaging2021

    • Author(s)
      Okubo Kyohei、Kitagawa Yuichi、Hosokawa Naoki、Umezawa Masakazu、Kamimura Masao、Kamiya Tomonori、Ohtani Naoko、Soga Kohei
    • Journal Title

      Biomedical Optics Express

      Volume: 12 Issue: 2 Pages: 823-823

    • DOI

      10.1364/boe.413712

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 肝性脳症発症に関わる腸内細菌の同定2022

    • Author(s)
      神谷知憲
    • Organizer
      第26回腸内細菌学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Functional Analysis of Liver Cirrhosis-associated Gut Microbiota Uncovers a Unique Mechanism of Hyperammonemia in Hepatic Encephalopathy2021

    • Author(s)
      Kamiya, Yoshimi Yukawa-Muto, Hideki Fujii, Hiroshi Mori, Atsushi Toyoda, Shinji Fukuda, Norifumi Kawada, Naoko Ohtani
    • Organizer
      アジア太平洋肝臓学会
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 肝性脳症発症に関わる腸内細菌の探索2021

    • Author(s)
      神谷知憲、武藤芳美、藤井英樹、森宙史、豊田敦、福田真嗣、河田則文、大谷直子
    • Organizer
      Gut Microbiota研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] 腸内細菌代謝物と肥満関連肝がん2020

    • Author(s)
      大谷直子, 神谷知憲, 蒲池史卓, 山岸良多
    • Organizer
      第79回日本癌学会
    • Related Report
      2020 Research-status Report
  • [Patent(Industrial Property Rights)] 高アンモニア血症の治療又は予防用医薬組成物2020

    • Inventor(s)
      大谷直子, 神谷知憲,武藤芳美, 福田真嗣, 佐藤郁也
    • Industrial Property Rights Holder
      大谷直子, 神谷知憲,武藤芳美, 福田真嗣, 佐藤郁也
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2021-034359
    • Filing Date
      2020
    • Related Report
      2020 Research-status Report
    • Overseas

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Published: 2020-04-28   Modified: 2024-01-30  

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