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Regulation of glucose metabolism by oxytocin via insulin secretion

Research Project

Project/Area Number 18K08524
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 InstitutionIryo Sosei University (2020-2023)
Jichi Medical University (2018-2019)

Principal Investigator

Dezaki Katsuya  医療創生大学, 薬学部, 教授 (90337329)

Project Period (FY) 2018-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsインスリン分泌 / 糖代謝 / 糖尿病 / オキシトシン / TRPM2 / インスリン / グルカゴン / カチオンチャネル / 視床下部
Outline of Final Research Achievements

The neurohypophysial hormone, oxytocin (Oxt), reportedly stimulates insulin release from pancreatic islets, however, direct action of Oxt on islet insulin-releasing b-cells remains to be determined. In mouse isolated islets, Oxt increased 8.3 mM glucose-induced insulin release without altering basal insulin release at 2.8 mM glucose. Oxt potentiated glucose (8.3 mM)-induced [Ca2+]i increases in b-cells. In the presence of Oxt receptor antagonist, Oxt failed to potentiate [Ca2+]i in b-cells, indicating interaction of Oxt with its receptor. The b-cell [Ca2+]i response to Oxt was attenuated by Gq-protein inhibitor and TRP channel blocker. These results demonstrate that Oxt directly interacts with b-cells, enhancing glucose-induced [Ca2+]i increase and insulin release. Oxt may glucose-dependently activates Gq-mediated non-selective cation channels to promote Ca2+ influx through L-type Ca2+ channels, providing a potential molecular target to treat type 2 diabetes.

Academic Significance and Societal Importance of the Research Achievements

血糖変動幅を小さくし血糖恒常性を高める事は糖尿病学・生理学の理想であり、内因性オキシトシンがこれを担うという申請者の発見は画期的であり、糖代謝機構の解明に貢献する学術的意義がある。オキシトシンの血糖依存的なインスリン分泌促進作用は、既存の糖尿病治療薬には無い全く新しい作用様式であり、新たな糖尿病治療薬の開発基盤を提供する。オキシトシン併用投与により、糖尿病治療薬の使用濃度を低下させることが可能となり、低血糖等の副作用頻度を軽減し糖尿病治療の安全性を高めることが期待される。

Report

(7 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
  • 2018 Research-status Report
  • Research Products

    (12 results)

All 2022 2021 2020 2019 2018

All Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 5 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] A novel mechanism of imeglimin‐mediated insulin secretion via the cADPR‐TRP channel pathway2022

    • Author(s)
      Funazaki Shunsuke、Yoshida Masashi、Yamada Hodaka、Kakei Masafumi、Kawakami Masanobu、Nagashima Shuichi、Hara Kazuo、Dezaki Katsuya
    • Journal Title

      Journal of Diabetes Investigation

      Volume: 13 Issue: 1 Pages: 34-41

    • DOI

      10.1111/jdi.13669

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Muscle mass evaluation using psoas muscle mass index by computed tomography imaging in hemodialysis patients2021

    • Author(s)
      Kiyonori Ito, Susumu Ookawara, Sojiro Imai, Hideo Kakuda, Yusaku Bandai, Mariko Fueki, Masatoshi Yasuda, Tatsuya Kamimura, Satoshi Kiryu, Noriko Wada, Yuri Hamashima, Mitsutoshi Shindo, Tadanao Kobayashi, Hidenori Sanayama, Yoshio Kaku, Keisuke Tanno, Yasushi Ohnishi, Noriaki Iino, Katsuya Dezaki 他
    • Journal Title

      Clinical Nutrition ESPEN

      Volume: 44: Pages: 410-414

    • DOI

      10.1016/j.clnesp.2021.04.029

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] β-Cell-specific deletion of HMG-CoA (3-hydroxy-3-methylglutaryl-coenzyme A) reductase causes overt diabetes due to reduction of β-cell mass and impaired insulin secretion.2020

    • Author(s)
      Takei Shoko, Nagashima Shuichi, Takei Akihito, Yamamuro Daisuke, Wakabayashi Tetsuji, Murakami Akiko, Isoda Masayo, Yamazaki Hisataka, Ebihara Chihiro, Takahashi Manabu, Ebihara Ken, Dezaki Katsuya, Takayanagi Yuki, Onaka Tatsushi, Fujiwara Ken, Yashiro Takashi, Ishibashi Shun
    • Journal Title

      Diabetes

      Volume: 69 Issue: 11 Pages: 2352-2363

    • DOI

      10.2337/db19-0996

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ninjin'yoeito targets distinct Ca2+ channels to activate ghrelin-responsive vs. unresponsive NPY neurons in the arcuate nucleus.2020

    • Author(s)
      Goswami Chayon, Dezaki Katsuya, Wang Lei, Inui Akio, Seino Yutaka, Yada Toshihiko
    • Journal Title

      Frontiers in Nutrition

      Volume: 7 Pages: 1-10

    • DOI

      10.3389/fnut.2020.00104

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] ASC regulates platelet activation and contributes to thrombus formation independent of NLRP3 inflammasome2020

    • Author(s)
      Watanabe Sachiko、Usui-Kawanishi Fumitake、Komada Takanori、Karasawa Tadayoshi、Kamata Ryo、Yamada Naoya、Kimura Hiroaki、Dezaki Katsuya、Ohmori Tsukasa、Takahashi Masafumi
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 531 Issue: 2 Pages: 125-132

    • DOI

      10.1016/j.bbrc.2020.07.063

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ninjin-yoeito activates ghrelin-responsive and unresponsive NPY neurons in the arcuate nucleus and counteracts cisplatin-induced anorexia2019

    • Author(s)
      Goswami Chayon、Dezaki Katsuya、Wang Lei、Inui Akio、Seino Yutaka、Yada Toshihiko
    • Journal Title

      Neuropeptides

      Volume: - Pages: 58-64

    • DOI

      10.1016/j.npep.2019.03.001

    • Related Report
      2019 Research-status Report 2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] ホルモンによる膵島機能制御2019

    • Author(s)
      稲垣 暢也、出崎 克也、原田 直樹、原田 範雄
    • Journal Title

      Islet Equality

      Volume: 8 Pages: 5-15

    • Related Report
      2019 Research-status Report
  • [Presentation] 消化管ホルモンによるTRPM2を介したインスリン分泌調節2021

    • Author(s)
      出崎 克也
    • Organizer
      第43回東北薬学セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] オキシトシンは膵β細胞の背景電流を増大させグルコース誘発インスリン分泌を促進する2019

    • Author(s)
      出崎 克也, 吉田 昌史, 伊藤 聖学, 加計 正文, 矢田 俊彦
    • Organizer
      第62回日本糖尿病学会年次学術集会学会
    • Related Report
      2019 Research-status Report
  • [Presentation] 膵β細胞GPR40シグナルはTRPチャネル活性化を介してKATP非依存性にインスリン分泌を増強する2019

    • Author(s)
      山田 穂高, 船崎 俊介, 吉田 昌史, 伊藤 聖学, 出崎 克也, 川上 正舒, 石川 三衛, 加計 正文, 原 一雄
    • Organizer
      第62回日本糖尿病学会年次学術集会学会
    • Related Report
      2019 Research-status Report
  • [Presentation] Gq-mediated activation of non-selective cation channels in insulin releasing b-cells2019

    • Author(s)
      Dezaki Katsuya
    • Organizer
      FAOPS2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] オキシトシン経鼻投与は内因性オキシトシン分泌を促進し耐糖能を向上させる2018

    • Author(s)
      出崎克也
    • Organizer
      第61回日本糖尿病学会年次学術集会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2025-01-30  

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