• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Identification of interaction mechanisms of two descendign pathways using circuit specific gene manupulation methods

Research Project

Project/Area Number 22K15206
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 46010:Neuroscience-general-related
Research InstitutionHyogo Medical University

Principal Investigator

Keisuke Koga  兵庫医科大学, 医学部, 助教 (50835189)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords痛み / 脊髄 / 青斑核 / ノルアドレナリン / 吻側延髄腹内側部 / 下行性疼痛制御 / 下行性抑制
Outline of Research at the Start

痛みは外傷や刺激により引き起こされ、生体の警告系として重要な役割を果たすが、過度な痛みや慢性痛は患者のQOLを著しく下げるため、適切なコントロールが必要である。痛みの調節には脳内で痛み強度を調節する内因性疼痛制御系が関与しており、青斑核や吻側延髄腹内側部といった神経核は、痛みの入り口である脊髄へ脳から下行性に投射して痛みのコントロールに重要な役割を果たす。しかしながら、これらの下行性神経核の相互連関については不明な点が多い。本研究では、上記2つの下行性神経核の相互作用とそのメカニズムの解明を目的とする。さらに下行性疼痛抑制系を利用した画期的な鎮痛薬や慢性疼痛の治療戦略の開発に繋がる知見を得る。

Outline of Final Research Achievements

Pain is an alert system in our body which notify potential or actual thread to us, but excessive pain significantly deteriorates our quality of life, and effective cares and treatments need to be developed. In this study, to identify new circuit mechanisms controlling pain, we focused on descending systems, especially on the rostral ventromedial medulla (RVM), the locus coeruleus (LC). We found that several LC neurons project to the RVM, and activation of this LC→RVM circuit decreased thermal pain sensitivity. We further investigated underlying molecular mechanisms of this behavior and performed patch-clamp recording from retrogradely labeled spinal cord (SC) projecting RVM neurons. (RVM→sc neurons). RVM→sc neurons exhibited depolarization and subsequent action potential firings by application of noradrenaline, and these responses were mediated a specific adrenergic receptor. These findings were crucial for development of new drugs for pain by using internal descending pathways

Academic Significance and Societal Importance of the Research Achievements

脳幹背側部に位置するノルアドレナリン(NA)神経核のLCは、脊髄を含む様々な脳領域に投射し、覚醒や注意・意識・認知などの生理機能と疼痛の制御に関与する。近年、疼痛制御におけるLC神経の脊髄や前頭前皮質への神経投射特異的な役割が報告された。しかし、LC神経は下行性神経核である吻側延髄腹内側部(RVM)にも投射するがその疼痛制御における役割は解明されておらず、2つの下行性神経核の相互作用機序は依然として不明である。本研究は回路特異的な神経活動操作法によりLC→RVM神経回路の疼痛制御における役割を明らかにする研究であり、下行性疼痛制御回路を利用した新規の鎮痛薬の開発に繋がることが期待される。

Report

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

    (13 results)

All 2024 2023 2022 Other

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

  • [Int'l Joint Research] ブリストル大学(英国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Anterior cingulate cross-hemispheric inhibition via the claustrum resolves painful sensory conflict2024

    • Author(s)
      Keisuke Koga, Kenta Kobayashi, Makoto Tsuda, Anthony E. Pickering, Hidemasa Furue
    • Journal Title

      Communications Biology

      Volume: 7(1):330. Issue: 1 Pages: 1-15

    • DOI

      10.1038/s42003-024-06008-9

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Optogenetic inhibition of spinal inhibitory neurons facilitates mechanical responses of spinal wide dynamic range neurons and causes mechanical hypersensitivity2024

    • Author(s)
      Yuka Fujiwara, Keisuke Koga, Nozomu H Nakamura, Keishi Maruo, Toshiya Tachibana, Hidemasa Furue
    • Journal Title

      Neuropharmacology

      Volume: 242:109763. Pages: 1-9

    • DOI

      10.1016/j.neuropharm.2023.109763

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Voltage-gated calcium channel subunit α2δ-1 in spinal dorsal horn neurons contributes to aberrant excitatory synaptic transmission and mechanical hypersensitivity after peripheral nerve injury2023

    • Author(s)
      Koga Keisuke、Kobayashi Kenta、Tsuda Makoto、Kubota Kazufumi、Kitano Yutaka、Furue Hidemasa
    • Journal Title

      Frontiers in Molecular Neuroscience

      Volume: 16 Pages: 1-13

    • DOI

      10.3389/fnmol.2023.1099925

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Identification of Spinal Inhibitory Interneurons Required for Attenuating Effect of Duloxetine on Neuropathic Allodynia-like Signs in Rats2022

    • Author(s)
      Ishibashi Tadayuki、Sueto Daichi、Yoshikawa Yu、Koga Keisuke、Yamaura Ken、Tsuda Makoto
    • Journal Title

      Cells

      Volume: 11 Issue: 24 Pages: 4051-4051

    • DOI

      10.3390/cells11244051

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Neuronal pentraxin 2 is required for facilitating excitatory synaptic inputs onto spinal neurons involved in pruriceptive transmission in a model of chronic itch2022

    • Author(s)
      Kanehisa Kensho、Koga Keisuke、Maejima Sho、Shiraishi Yuto、Asai Konatsu、Shiratori-Hayashi Miho、Xiao Mei-Fang、Sakamoto Hirotaka、Worley Paul F.、Tsuda Makoto
    • Journal Title

      Nature Communications

      Volume: 13 Issue: 1 Pages: 2367-2367

    • DOI

      10.1038/s41467-022-30089-x

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 脊髄後角興奮性神経に発現するα2δ-1サブユニットの機械性痛覚過敏における役割解明2024

    • Author(s)
      古賀 啓祐、小林 憲太、津田 誠、窪田 一史、北野 裕、古江 秀昌
    • Organizer
      第101回 生理学会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 疼痛制御に関与する新たな中枢神経機構の探索と役割解明2024

    • Author(s)
      古賀 啓祐,古江 秀昌
    • Organizer
      痛み研究会2023
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 神経障害性疼痛における脊髄後角神経に発現するα2δ-1サブユニットの役割2023

    • Author(s)
      古賀 啓祐、小林 憲太、津田 誠、窪田 一史、北野 裕、古江 秀昌
    • Organizer
      第45回日本疼痛学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Involvement of the voltage-gated calcium channel subunit, α2δ-1, expressed in spinal dorsal horn excitatory neurons for facilitation of excitatory synaptic transmission and mechanical hypersensitivity after peripheral nerve injury.2023

    • Author(s)
      古賀 啓祐、小林 憲太、津田 誠、窪田 一史、北野 裕、古江 秀昌
    • Organizer
      Neuroscience 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 脊髄後角神経に発現するα2δ-1サブユニットの神経障害性疼痛における役割2023

    • Author(s)
      Keisuke Koga, Kenta Kobayashi, Makoto Tsuda, Kazufumi Kubota, Yutaka Kitano, Hidemasa Furue
    • Organizer
      生理学研究会
    • Related Report
      2022 Research-status Report
  • [Presentation] α2δ-1 expressed in spinal dorsal horn neurons is involved in aberrant excitatory synaptic transmission and mechanical hypersensitivity after peripheral nerve injury.2023

    • Author(s)
      Keisuke Koga, Kenta Kobayashi, Makoto Tsuda, Kazufumi Kubota, Yutaka Kitano, Hidemasa Furue
    • Organizer
      第100回生理学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] α2δ-1 expressed in spinal dorsal horn excitatory neurons contributes to nerve injury-induced neuropathic pain.2022

    • Author(s)
      Keisuke Koga, Kenta Kobayashi, Makoto Tsuda, Kazufumi Kubota, Yutaka Kitano, Hidemasa Furue
    • Organizer
      Neuro 2022
    • Related Report
      2022 Research-status Report

URL: 

Published: 2022-04-19   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi