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Do Trace Amines Regulate the Function of Exocrine Cells? - Elucidating Neuro-Exocrine Interactions

Research Project

Project/Area Number 22K06795
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 48010:Anatomy-related
Research InstitutionIwate Medical University

Principal Investigator

SAINO TOMOYUKI  岩手医科大学, 医学部, 教授 (40305991)

Co-Investigator(Kenkyū-buntansha) 横山 拓矢  岩手大学, 農学部, 准教授 (70772094)
東尾 浩典  岩手医科大学, 教養教育センター, 准教授 (50342837)
Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2024: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords微量アミン関連受容体 / 耳下腺 / 細胞内カルシウムイオン / カルシウムイメージング / 外分泌腺 / 細胞内Ca2+ / 微量アミン / 微量アミン受容体
Outline of Research at the Start

微量アミン(trace amine:TA)は生体アミンと共に分泌され、感情や認知に関する障害に関与すると言われる。認知機能低下時には唾液分泌も障害される。TAも様々な外分泌活動の制御にかかわっている可能性が高いが、加齢や神経疾患において、このTAが外分泌腺に対し、どのような影響を与えるかについては不明である。そこで我々は、TA並びにTA関連受容体(TAAR)に着目し、組織形態を保ったラットの外分泌腺において、TAARが外分泌機能に影響を与えるか否かを、細胞内Ca2+濃度変動を指標として解析し、神経-外分泌機能連関を機能形態学的観点から解明しようと企図したのが本研究である。

Outline of Final Research Achievements

Trace amines (TAs) and TAARs regulate neurotransmission. Although TAAR1 is linked to neurological disorders, its role in salivary secretion was unclear. In rat parotid glands, RT-PCR confirmed high TAAR1 expression in acinar cells. Applying the TAAR1 agonist RO5256390 (RO) to cultured acinar cells caused a significant rise in intracellular calcium ([Ca2+]i). Pharmacological analysis showed this increase required both release from intracellular stores and calcium influx from the extracellular space. Blocking cAMP sensors Epac2 and CaMKII or inhibiting PKA markedly reduced the RO-induced calcium rise. The strong suppression by PKA antagonism suggests a signaling mechanism in parotid cells distinct from that in cerebral arterioles. These findings indicate that TAAR1 activation orchestrates IP3 and cAMP pathways to regulate calcium dynamics in parotid cells, supporting further exploration of TAAR1-targeted therapies for exocrine dysfunction and potential novel treatments.

Academic Significance and Societal Importance of the Research Achievements

本研究は、TAAR1が唾液分泌を制御する分子メカニズムを明らかにした点で学術的に意義がある。具体的には、TAAR1の活性化はIP3経路とcAMP経路が協調して細胞内カルシウム動態を制御することを示し、外分泌腺におけるTAARの神経‐分子連関を初めて詳細に解明した。社会的には、加齢やシェーグレン症候群などに伴う唾液分泌の低下等の外分泌障害に対し、TAAR1を標的とした新規治療法開発への道を拓く点で大きな意義があると考える。

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (13 results)

All 2024 2023 2022

All Journal Article (7 results) (of which Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (6 results)

  • [Journal Article] Immunohistochemical analysis and distribution of epithelial mast cells in the rat larynx and trachea2024

    • Author(s)
      Abdali Sayed Sharif、Yokoyama Takuya、Yamamoto Yoshio、Narita Keishi、Hirakawa Masato、Saino Tomoyuki
    • Journal Title

      Histochemistry and Cell Biology

      Volume: 162 Issue: 4 Pages: 287-297

    • DOI

      10.1007/s00418-024-02309-6

    • Related Report
      2024 Annual Research Report
  • [Journal Article] Immunohistochemical localization of proteins involved in exocytosis of glutamate from P2X3 purinoceptor-expressing subserosal afferent nerve endings in the rat gastric antrum2024

    • Author(s)
      Hirakawa Masato、Yokoyama Takuya、Abdali Sayed Sharif、Yamamoto Yoshio、Saino Tomoyuki
    • Journal Title

      Acta Histochemica

      Volume: 126 Issue: 4 Pages: 152170-152170

    • DOI

      10.1016/j.acthis.2024.152170

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Immunohistochemical localization of P2Y12 purinoceptors in the rat carotid body2024

    • Author(s)
      Yokoyama Takuya、Saino Tomoyuki、Nakamuta Nobuaki、Yamamoto Yoshio
    • Journal Title

      Autonomic Neuroscience

      Volume: 252 Pages: 103158-103158

    • DOI

      10.1016/j.autneu.2024.103158

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 3-Iodothyronamine, a trace amine-associated receptor agonist, regulates intracellular Ca2+ increases via CaMK II through Epac2 in rat cerebral arterioles2023

    • Author(s)
      SAKANOUE Wakana、YOKOYAMA Takuya、HIRAKAWA Masato、MAESAWA Satsuki、SATO Kenichi、SAINO Tomoyuki
    • Journal Title

      Biomedical Research

      Volume: 44 Issue: 5 Pages: 219-232

    • DOI

      10.2220/biomedres.44.219

    • ISSN
      0388-6107, 1880-313X
    • Year and Date
      2023-09-27
    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Immunolocalization of vesicular glutamate transporter 2 and exocytosis‐related proteins in afferent nerve endings innervating taste buds in the rat incisive papilla2023

    • Author(s)
      Yokoyama Takuya、Ito Motoi、Yamamoto Yoshio、Hirakawa Masato、Sakanoue Wakana、Sato Kenichi、Saino Tomoyuki
    • Journal Title

      Anatomia, Histologia, Embryologia

      Volume: - Issue: 4 Pages: 531-537

    • DOI

      10.1111/ahe.12911

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Immunohistochemical analysis of glutamatergic and serotonergic signaling pathways in chemosensory cell clusters in the pharynx and larynx of rats2023

    • Author(s)
      Abdali Sayed Sharif、Yokoyama Takuya、Nakamuta Nobuaki、Saino Tomoyuki、Yamamoto Yoshio
    • Journal Title

      Tissue and Cell

      Volume: 82 Pages: 102122-102122

    • DOI

      10.1016/j.tice.2023.102122

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Suitability of Polymyxin B as a Mucosal Adjuvant for Intranasal Influenza and COVID-19 Vaccines2023

    • Author(s)
      Yoshino Naoto、Yokoyama Takuya、Sakai Hironori、Sugiyama Ikumi、Odagiri Takashi、Kimura Masahiro、Hojo Wataru、Saino Tomoyuki、Muraki Yasushi
    • Journal Title

      Vaccines

      Volume: 11 Issue: 11 Pages: 1727-1727

    • DOI

      10.3390/vaccines11111727

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ラットフェロモン受容体の局在を規定する因子の検討2024

    • Author(s)
      成田啓之、平川正人、阿久津仁美、Sayed Sharif Abdali、齋野朝幸
    • Organizer
      第129回日本解剖学会総会・全国学術集会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Immunohistochemical localization of cyclooxygenase 1 and 2 in the rat larynx and trachea2024

    • Author(s)
      Sayed Sharif Abdali、Takuya Yokoyama、Yoshio Yamamoto、Keishi Narita、Masato Hirakawa、Tomoyuki Saino
    • Organizer
      第129回日本解剖学会総会・全国学術集会
    • Related Report
      2024 Annual Research Report
  • [Presentation] 微量アミン関連受容体(TAAR)1がラット耳下腺腺房細胞に与える作用2024

    • Author(s)
      大野真由子、齋野朝幸、前澤五月、佐藤健一
    • Organizer
      第52回日本歯科麻酔学会総会・学術集会
    • Related Report
      2024 Annual Research Report
  • [Presentation] 微量アミン関連受容体アゴニストである3-ヨードチロナミンは、ラット脳細動脈においてEpac2を 経由しCaMK IIを介して細胞内Ca2+増加を制御する。2024

    • Author(s)
      齋野朝幸、坂野上和奏、横山拓矢、平川正人、前澤五月、佐藤健一
    • Organizer
      第129回日本解剖学会総会・全国学術集会
    • Related Report
      2023 Research-status Report
  • [Presentation] 微量アミン関連受容体(TAAR)アゴニストである3-iodothyronamineはラット脳細動脈においてTAARとは別の受容体にも働く可能性がある。2022

    • Author(s)
      坂野上和奏、齋野朝幸、横山拓矢、平川正人、伊藤元、佐藤健一
    • Organizer
      日本解剖学会第68回東北・北海道連合支部学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] 微量アミン関連受容体(TAAR)アゴニストである3-iodothyronamine(T1AM)はラット脳細動脈においてTAARとは別の受容体にも働く。2022

    • Author(s)
      坂野上和奏、齋野朝幸、横山拓矢、平川正人、伊藤元、佐藤健一
    • Organizer
      第50回日本歯科麻酔学会総会・学術集会
    • Related Report
      2022 Research-status Report

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Published: 2022-04-19   Modified: 2026-01-16  

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