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Research on leptin secretion-stimulating action from gastric mucosal cells and its anti-obesity effects by food factor

Research Project

Project/Area Number 19K11720
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 59040:Nutrition science and health science-related
Research InstitutionOsaka Prefecture University

Principal Investigator

Mitsugu Akagawa  大阪府立大学, 生命環境科学研究科, 准教授 (70405356)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsleptin / obesity / catechin / polyphenol / green tea / レプチン / 緑茶カテキン / エピガロカテキンガレート / 抗肥満 / 肥満 / 食品機能 / 胃粘膜細胞 / 機能性食品
Outline of Research at the Start

世界的に蔓延する肥満は、生活習慣病の発症基盤であり、 深刻な健康問題となっている。本課題で着目した「レプチン」は、視床下部に作用して食欲を抑制して体重を減少させる抗肥満ホルモンとして知られる。本研究では、胃粘膜細胞のレプチン分泌を刺激する食品因子を探索・同定し、その分泌刺激機構を分子レベル で解明することを目的とする。また、その抗肥満効果をin vivo試験で実証することで新規の 食品機能性を確立し、肥満の予防・改善に資する高機能性食品の創製を目指す。

Outline of Final Research Achievements

Leptin is a weight-reducing hormone produced by adipose tissue and gastric mucosa, which decreases food intake via its hypothalamic receptor. Onset of food intake triggers a rapid release of leptin into the gastric lumen from gastric mucosa, and increases plasma leptin level. Gastric leptin participates in the short term regulation of food intake. However, little is known about food factors that stimulate leptin secretion from gastric mucosa. In this study, we searched for anti-obesity food ingredients that stimulate leptin secretion from cultured gastric mucosal cells. We exposed about 50 food ingredients to rat gastric mucosal cells (RGM1) and evaluated leptin secretion. Consequently, we found that epigallocatechin-3-O-gallate (EGCG), a major green tea catechin, greatly stimulates leptin secretion from RGM1 cells. Moreover, we demonstrated that oral administration of EGCG increased the level of leptin in gastric juice.

Academic Significance and Societal Importance of the Research Achievements

本研究によって食品因子による胃粘膜細胞のレプチン分泌刺激作用とその機構が初めて解明された。また、食によるレプチンの分泌制御という新規の食品機能性を確立することができた。本研究の達成により、肥満を発症基盤とする多くの生活習慣病の予防・改善にも貢献しうることから、国民生活への反映、および波及効果は、極めて大きいものである。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results) Book (1 results)

  • [Journal Article] Oxidative deamination of lysine residues by polyphenols generates an equilibrium of aldehyde and 2-piperidinol products2021

    • Author(s)
      Yamaguchi K, Itakura M, Kitazawa R, Lim SY, Nagata K, Shibata T, Akagawa M, Uchida K.
    • Journal Title

      J Biol Chem

      Volume: 297 Issue: 3 Pages: 101035-101035

    • DOI

      10.1016/j.jbc.2021.101035

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Sodium sulfite causes gastric mucosal cell death by inducing oxidative stress.2021

    • Author(s)
      shimo M, Nakashima F, Kai K, Matsui H, Shibata T, Akagawa M.
    • Journal Title

      Free Radic Res

      Volume: 55 Issue: 6 Pages: 731-743

    • DOI

      10.1080/10715762.2021.1937620

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Protein carbonylation: molecular mechanisms, biological implications, and analytical approaches2021

    • Author(s)
      Akagawa M.
    • Journal Title

      Free Radic Res

      Volume: 22 Issue: 4 Pages: 307-320

    • DOI

      10.1080/10715762.2020.1851027

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] アカメガシワ由来ポリフェノール、ベルゲニンのSIRT1/PGC-1α経路を介したミトコンドリア新生促進作用の解明2021

    • Author(s)
      永良 祐樹、赤川 貢、内藤 健太郎
    • Organizer
      日本農芸化学会2021年度大会
    • Related Report
      2020 Research-status Report
  • [Presentation] (-)-Epigallocatechin-3-O-gallateの胃粘膜細胞に対するレプチン分泌刺激作用の解明2020

    • Author(s)
      佐々木 知里、太田 裕基、石井 剛志、向井 克之、赤川 貢
    • Organizer
      第59回日本栄養・食糧学会近畿支部大会
    • Related Report
      2020 Research-status Report
  • [Presentation] フェニルホウ酸誘導体との親和性を利用したフラボノール標的タンパク質の網羅的分析法の開発2020

    • Author(s)
      早川 諒、中川 侑紀、飯泉 陽介、石井 剛志、芦田 均、赤川 貢
    • Organizer
      日本農芸化学会2020年度大会
    • Related Report
      2019 Research-status Report
  • [Presentation] (-)-Epigallocatechin-3-O-gallate stimulates leptin secretion from gastric mucosal cells via 67-kDa laminin receptor/Ca2+ signaling.2019

    • Author(s)
      Chisato Sasaki, Hiroki Ota, Takeshi Ishii, Katsuyuki Mukai, Akinobu Matsuyama, Mitsugu Akagawa.
    • Organizer
      The 9th International Conference on Polyphenols and Health (ICPH2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] A systematic and comprehensive analytical strategy to identify quercetin-modified proteins.2019

    • Author(s)
      Yuki Nakagawa, Yosuke Iizumi, Takeshi Ishii, Hitoshi Ashida, and Mitsugu Akagawa.
    • Organizer
      The 9th International Conference on Polyphenols and Health (ICPH2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Book] 茶ポリフェノールの生理機能と応用展開 “化学修飾タンパク質の生成と機能”2019

    • Author(s)
      赤川 貢、内田 浩二
    • Total Pages
      7
    • Publisher
      シーエムシー出版
    • ISBN
      9784781314334
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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