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Comprehensive understanding of orofacial pain induced by dry mouth

Research Project

Project/Area Number 17K11654
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Functional basic dentistry
Research InstitutionNihon University

Principal Investigator

IWATA Koichi  日本大学, 歯学部, 教授 (60160115)

Co-Investigator(Kenkyū-buntansha) 中西 博  安田女子大学, 薬学部, 教授 (20155774)
篠田 雅路  日本大学, 歯学部, 准教授 (20362238)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords口腔乾燥 / 舌痛 / 舌乾燥 / p38 / TRPV4 / 衛星細胞 / 三叉神経節 / p38マップキナーゼ / トリップチャネルV4 / 舌機械痛覚過敏 / 三叉神経節細胞 / 痛覚過敏 / TRPV1 / 歯学 / 口腔生理学 / 口腔乾燥症 / 異常疼痛
Outline of Final Research Achievements

Although xerostomia can cause persistent oral pain, the mechanisms underlying such pain are not well understood. A rat model of dry tongue was used to study the nocifensive reflex and pp38 and TRPV4 expression in trigeminal ganglion (TG) neurons. The head-withdrawal reflex threshold for mechanical stimulation of the tongue was significantly lower in dry-tongue rats. The numbers of TRPV4- and pp38-immunoreactive cells in the TG were significantly higher in dry-tongue rats. Many TRPV4-IR cells were also pp38-immunoreactive. TRPV4 blocker attenuated tongue mechanical hypersensitivity in dry-tongue rats. Intraganglionic injection of a selective p38 MAP kinase inhibitor eliminated tongue hypersensitivity in dry-tongue rats and suppressed TRPV4 expression in TG neurons. The present findings suggest that TRPV4 activation via p38 phosphorylation in TG neurons is involved in mechanical hypersensitivity associated with dry tongue.

Academic Significance and Societal Importance of the Research Achievements

口腔乾燥によって引き起こされる口腔痛は、様々な口腔機能に対して障害を引き起こし、QOLの著しい低下を引き起こす可能性がある。本研究はこのような口腔乾燥に起因する舌痛の発症機構の解明を目指すもので、学術的な意義だけでなく、歯科臨床に対しても非常に重要である。本研究プロジェクトでは、舌乾燥によって引き起こされる、舌の異常疼痛の発症に対して、p38のリン酸化を介するTRPV4チャンネルの活性化が関与することを突き止めた。臨床的にはこのpp38-TRPV4の細胞内伝達系を制御することができれば口腔乾燥に起因する口腔痛を治療することが可能であることを示唆しており、学術的にも社会的にも意義がある。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (13 results)

All 2020 2019 2018 2017

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 4 results) Presentation (3 results) (of which Invited: 2 results) Book (2 results)

  • [Journal Article] A perspective from experimental studies of burning mouth syndrome2020

    • Author(s)
      Imamura Y, Okada-Ogawa A, Noma N, Shinozaki T, Watanabe K, Kohashi R, Shinoda M, Wada A, Abe O, Iwata K
    • Journal Title

      Journal of Oral Science

      Volume: 62 Issue: 2 Pages: 165-169

    • DOI

      10.2334/josnusd.19-0459

    • NAID

      130007821525

    • ISSN
      1343-4934, 1880-4926
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Pathophysiological mechanisms of persistent orofacial pain2020

    • Author(s)
      Shinoda Masamichi、Hayashi Yoshinori、Kubo Asako、Iwata Koichi
    • Journal Title

      Journal of Oral Science

      Volume: 62 Issue: 2 Pages: 131-135

    • DOI

      10.2334/josnusd.19-0373

    • NAID

      130007821522

    • ISSN
      1343-4934, 1880-4926
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Peripheral and Central Mechanisms of Persistent Orofacial Pain2019

    • Author(s)
      Shinoda Masamichi、Kubo Asako、Hayashi Yoshinori、Iwata Koichi
    • Journal Title

      Frontiers in Neuroscience

      Volume: 13 Pages: 1-10

    • DOI

      10.3389/fnins.2019.01227

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Role of neuron and non-neuronal cell communication in persistent orofacial pain2019

    • Author(s)
      Iwata Koichi、Shinoda Masamichi
    • Journal Title

      Journal of Dental Anesthesia and Pain Medicine

      Volume: 19 Issue: 2 Pages: 77-82

    • DOI

      10.17245/jdapm.2019.19.2.77

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Involvement of transient receptor potential vanilloid 2 in intra-oral incisional pain2018

    • Author(s)
      Kentaro Urata, Masamichi Shinoda, Daisuke Ikutame, Toshimitsu Iinuma and Koichi Iwata
    • Journal Title

      Oral Dis

      Volume: 24 Issue: 5 Pages: 1093-1100

    • DOI

      10.1111/j.1601-0825.2010.01782.x

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Neuron-glia interaction is a key mechanism underlying persistent orofacial pain2017

    • Author(s)
      Chen JY, Kubo A, Shinoda M, Okada-Ogawa A, Imamura Y, Iwata K
    • Journal Title

      Journal of Oral Science

      Volume: 59 Issue: 2 Pages: 173-175

    • DOI

      10.2334/josnusd.16-0858

    • NAID

      130006882395

    • ISSN
      1343-4934, 1880-4926
    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Oxytocin alleviates orofacial mechanical hypersensitivity associated with infraorbital nerve injury via vasopressin 1A receptors of the rat trigeminal ganglia.2017

    • Author(s)
      Kubo A, Shinoda M, Katagiri A, Takeda M, Suzuki T, Asaka J, Yeomans D, Iwata K.
    • Journal Title

      Pain

      Volume: 158(4) Issue: 4 Pages: 649-659

    • DOI

      10.1097/j.pain.0000000000000808

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Phosphorylation of p38 in Trigeminal Ganglion Neurons Contributes to Tongue Heat Hypersensitivity in Mice2017

    • Author(s)
      Maruno M, Shinoda M, Honda K, Ito R, Urata K, Watanabe M, Okada S, Lee J, Gionhaku N, Iwata K.
    • Journal Title

      J Oral Facial Pain Headache.

      Volume: 31 Issue: 4 Pages: 372-380

    • DOI

      10.11607/ofph.1849

    • Related Report
      2017 Research-status Report
  • [Presentation] 口腔顔面領域に発症する異所性痛覚過敏の神経機構2019

    • Author(s)
      岩田幸一
    • Organizer
      広大歯学会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 口腔顔面痛研究の変遷と未来2019

    • Author(s)
      岩田幸一
    • Organizer
      第24回日本口腔顔面痛学会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 舌乾燥症による舌痛覚過敏の末梢神経機構2017

    • Author(s)
      陳睿妍,篠田雅路,岩田幸一
    • Organizer
      第59回歯科基礎医学会学術大会
    • Related Report
      2017 Research-status Report
  • [Book] Contemporary Oral Medicine (Neurophysiology of Orofacial Pain)2019

    • Author(s)
      Koichi Iwata, Mamoru Takeda, Seog Bae Oh, Masamichi Shinoda
    • Total Pages
      2406
    • Publisher
      Springer, Cham
    • Related Report
      2019 Annual Research Report
  • [Book] 歯科基礎生理学 第7版2019

    • Author(s)
      岩田幸一、加藤隆史、井上富雄、船橋誠
    • Total Pages
      475
    • Publisher
      医歯薬出版
    • Related Report
      2019 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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