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Systemic inflammation-induced pain-network plasticity and hyperalgesia

Research Project

Project/Area Number 19K16932
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 51030:Pathophysiologic neuroscience-related
Research InstitutionJikei University School of Medicine

Principal Investigator

Sugimura Yae  東京慈恵会医科大学, 医学部, 助教 (20825997)

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: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords全身性炎症 / 外側腕傍核 / 扁桃体中心核 / 中脳水道周囲灰白質 / カルシトニン遺伝子関連ペプチド / シナプス伝達 / 痛覚過敏 / 炎症 / 腕傍核 / 扁桃体 / 光遺伝学 / 化学遺伝学
Outline of Research at the Start

痛みは「不快な感覚的・情動的体験」であり、慢性痛に伴う痛覚過敏は通常は無~低侵害性の刺激が強い痛みを生じさせるため、患者を苦しめる。全身性炎症による痛覚過敏には脳内痛みネットワークの可塑的変化が関与していると想定されるが、その詳細な機序は未解明である。本研究では1)全身性炎症における侵害受容情報や炎症情報を伝達する腕傍核―扁桃体中心核 (CeA) 経路およびCeA局所回路と出力系の可塑的変化、2)痛覚過敏に関わる投射依存的・分子マーカー特異的なCeAの細胞集団を明らかにする。脳内痛みネットワークの可塑的変化が痛覚過敏を引き起こす機序を解明することで、難治化する慢性痛の治療法の確立につなげる。

Outline of Final Research Achievements

Aiming to reveal the neural mechanisms underlying pain sensitization in patients with systemic inflammation, I analyzed the synaptic activity of the central pain network in mice with lipopolysaccharide (LPS)-induced inflammation. In brain slices of the mouse, synaptic inputs from the CGRP-expressing neurons in the lateral parabrachial nucleus (LPB), a nucleus receiving nociceptive and inflammatory signals, were light-evoked and the synaptic responses were recorded from neurons in the central nucleus of the amygdala (CeA) projecting to the periaqueductal grey (PAG), a central origin of the descending pain modulatory systems, as identified by retrograde labeling. I found that in PAG-projecting CeA neurons, the excitatory inputs from the LPB was enhanced and the balance between the direct excitatory and indirect inhibitory inputs via the CeA local circuit was modified in systemically inflamed mice with hyperalgesia, suggesting these plastic changes underlie inflammation-induced pain

Academic Significance and Societal Importance of the Research Achievements

本研究は初めてPAGに投射するCeAニューロンからLPB由来シナプス入力に対する応答を記録した.これまで離れた神経核を結ぶネットワークをシナプスレベルで詳細に解析することは技術的に困難であったため,本研究で得られたデータは貴重である.痛覚過敏を呈する全身性炎症モデルにおいてLPB-CeAシナプス伝達の可塑的変化を捉えたことは今後の痛みに関する脳内ネットワークの全容解明と痛覚過敏を伴う慢性痛の新たな治療法の開発に寄与すると期待される.

Report

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

    (10 results)

All 2022 2021 2020 2019

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (6 results) (of which Int'l Joint Research: 2 results) Book (1 results)

  • [Journal Article] Acetaminophen and pregabalin attenuate central sensitization in rodent models of nociplastic widespread pain2022

    • Author(s)
      Manami Yajima, Mariko Sugimoto, Yae K.Sugimura, Yukari Takahashi, Fusao Kato
    • Journal Title

      Neuropharmacology

      Volume: 210 Pages: 1-14

    • DOI

      10.1016/j.neuropharm.2022.109029

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Active role of the central amygdala in widespread mechanical sensitization in rats with facial inflammatory pain.2021

    • Author(s)
      Sugimoto M, Takahashi Y, Sugimura YK, Tokunaga R, Yajima M, Kato F.
    • Journal Title

      Pain

      Volume: Publish Ahead of Print Issue: 8 Pages: 1-14

    • DOI

      10.1097/j.pain.0000000000002224

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Primary Role of the Amygdala in Spontaneous Inflammatory Pain- Associated Activation of Pain Networks - A Chemogenetic Manganese-Enhanced MRI Approach.2019

    • Author(s)
      Daigo Arimura, Kei Shinohara, Yukari Takahashi, Yae K Sugimura, Mariko Sugimoto, Tomokazu Tsurugizawa, Keishi Marumo, Fusao Kato
    • Journal Title

      Frontiers in neural circuits

      Volume: 13 Pages: 58-58

    • DOI

      10.3389/fncir.2019.00058

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 電気生理学的実験手技を用いた腕傍核-扁桃体シナプス伝達の可塑的変化機構の解明2021

    • Author(s)
      杉村弥恵
    • Organizer
      第43回日本疼痛学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 炎症が痛みの上行性・下行性経路に関わる扁桃体中心核ニューロンに及ぼす影響2021

    • Author(s)
      杉村弥恵 高橋由香里 奥田崇雄 徳永 亮太 加藤 総夫
    • Organizer
      生理学研究所 痛みの研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] 炎症による痛みネットワーク可塑的変化における扁桃体の役割2021

    • Author(s)
      杉村弥恵 高橋由香里 奥田崇雄 徳永亮太 加藤 総夫
    • Organizer
      第98回日本生理学会大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 侵害受容扁桃体可塑性と炎症性疼痛2019

    • Author(s)
      杉村弥恵、加藤総夫、高橋由香里、Masoumeh Ghaemi-Jandabi、Zahra Ghasemi
    • Organizer
      第41回日本疼痛学会
    • Related Report
      2019 Research-status Report
  • [Presentation] Pain-related plasticity in the synaptic transmission from the central amygdala to the periaqueductal grey2019

    • Author(s)
      Yae K Sugimura, Masoumeh Ghaemi-Jandabi, Zahra Ghasemi, Yukari Takahashi, Fusao Kato
    • Organizer
      48th Naito Conference on Integrated Sensory Sciences ― Pain, Itch, Smell and Taste
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Functional and molecular dissection of nociceptive amygdala2019

    • Author(s)
      Yae K. Sugimura, Daigo Arimura, Yukari Takahashi, Fusao Kato
    • Organizer
      8th Asian Pain Symposium
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Book] 実験医学別冊 決定版 ウイルスベクターによる遺伝子導入実験ガイド2020

    • Author(s)
      平井宏和,日置寛之,小林和人 (編集)
    • Total Pages
      285
    • Publisher
      羊土社
    • ISBN
      9784758122474
    • Related Report
      2020 Research-status Report

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

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