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炎症性疼痛過敏の発症メカニズムにおけるATP受容体の役割

Research Project

Project/Area Number 15790112
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field General anatomy (including Histology/Embryology)
Research InstitutionHyogo Medical University

Principal Investigator

戴 毅  兵庫医科大学, 医学部, 助手 (20330441)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2003: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsDRG / P2X受容体 / PAR2 / ERK / ATP / Fos / tryptase / P2X / pain / inflammation
Research Abstract

正常ラット後根神経節(DRG)ニューロンにおける各ATP受容体サブタイプの詳細な分布を調べた。また慢性炎症モデル動物において、後根神経節(DRG)ニューロンの各ATP受容体サブタイプと末梢組織への侵害刺激との相関関係を調べた。炎症痛の発症メカニズムの一つとして、Tryptaseなどproteinase activated receptor 2 (PAR2)のアゴニストによるATP受容体の活性増強を認めた。
1.ATP受容体サブタイプのRNAプローブを作成した。ラットDRGにてin situハイブリダイゼーションを行い各サブタイプの存在を調べ、同時にその分布も明らかにした。この成果はJ.Comp.Neurol.481:377-90、2005にて発表した。
2.ラット末梢炎症モデルにおいてP2X3受容体のアゴニストをラット足底部に注射し、一定時間後のDRGニューロンでのERKのリン酸化を検索した。炎症状態ではP2X3受容体の感受性が上昇することが観察された。モデルラットの足底に圧刺激、温度刺激を定量的に与え、誘導されたリン酸化ERKとP2X3の共存を免疫二重染色法で検証した。炎症状態においてリン酸化ERKの発現およびP2X3との共存率が有意に上昇した。またP2X受容体のアンタゴニストによりこのリン酸化ERKの発現が有意に抑制された。この成果は国際疹痛学会機関誌Pain 108,258-66.2004に掲載された。
3.P2X3受容体はPAR2との共存率が高く、αβmet-ATP足底注射により痛み行動や脊髄後角で誘導されたFosタンパクは、PAR-2選択的なアゴニスト投与によって増強(増加)されたことを証明した。炎症時産生されるTryptaseなどPAR-2アゴニストによるATP受容体の活性増強が炎症性疼痛発症機序の一つであることが示唆された。(論文作成中)

Report

(2 results)
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (12 results)

All 2004 Other

All Journal Article (6 results) Publications (6 results)

  • [Journal Article] PAR2 mediated potentiation of TRPV1 activity reveals a mechanism for proteinase-induced inflammatory pain2004

    • Author(s)
      Dai, Y.et al.
    • Journal Title

      J.Neurosci 24

      Pages: 4293-4299

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Tissue plasminogen activator in primary afferents induces dorsal horn excitability and pain response after peripheral nerve injury2004

    • Author(s)
      Yamanaka, H.et al.
    • Journal Title

      Eur.J.Neurosci. 19

      Pages: 93-102

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Differential activation of MAPK in injured and uninjured DRG neurons following chronic constriction injury of the sciatic nerve in rats2004

    • Author(s)
      Obata, K.et al.
    • Journal Title

      Eur.J.Neurosci. 20

      Pages: 2881-2895

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Role of the MAPK activation in injured and intact primary afferent neurons for mechanical and heat hypersensitivity after spinal nerve ligation2004

    • Author(s)
      Obata, K.et al.
    • Journal Title

      J.Neurosci 24

      Pages: 10211-10222

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Enhancement of stimulation-induced ERK activation in the spinal dorsal horn and gracile nucleus neurons in rats with peripheral nerve injury2004

    • Author(s)
      Wang, H.et al.
    • Journal Title

      Eur.J.Neurosci 19

      Pages: 884-890

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Activation of extracellular signal-regulated protein kinase in dorsal horn neurons in the rat neuropathic intermittent claudication model2004

    • Author(s)
      Liu, Y.et al.
    • Journal Title

      Pain 109

      Pages: 64-72

    • Related Report
      2004 Annual Research Report
  • [Publications] Obata.K.: "Contribution of injured and uninjured DRG neurons to pain behavior and the changes in gene expression following chronic constriction injury of the sciatic nerve in rats"Pain. 101. 65-77 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Obata.K.: "Differential activation of extracellular signal-regulated protein kinase in primary afferent neurons regulates brain-derived neurotrophic factor expression after peripheral inflammation and nerve injury."J.Neurosci.. 23. 4117-4126 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kominato.Y.: "Changes in phosphorylation of ERK and Fos expression in dorsal horn neurons following noxious stimulation in a rat model of neuritis of the nerve root."Brain Res.. 967. 89-97 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Takahashi.N.: "Expression of auxiliary beta subunits of sodium channels in primary afferent neurons and the effect of nerve injury."Neuroscience. 121. 441-450 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Dai, Y: "Contribution of sensitized P2X receptors in inflamed tissue to the mechanical hypersensitivity revealed by phosphorylated ERK in DRG neurons."Pain. 108. 258-266 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Wang.H.: "Enhancement of stimulation-induced ERK activation in the spinal dorsal horn and gracile nucleus neurons in rats with peripheral nerve injury"Eur.J.Neurosci.. 19. 884-890 (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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