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The function and relationship between interstitial cells in the detrusor bundle and smooth muscle cells

Research Project

Project/Area Number 15K10635
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Urology
Research InstitutionKurume University

Principal Investigator

Tokumasa Hayashi  久留米大学, 医学部, 講師 (20341357)

Co-Investigator(Kenkyū-buntansha) 太田 啓介  久留米大学, 医学部, 准教授 (00258401)
武谷 三恵  久留米大学, 医学部, 助教 (30289433)
Research Collaborator Hashitani Hikaru  
Nakamura Keiichiro  
Uemura Keiichiro  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords排尿筋 / 間質細胞 / SK3 / 免疫染色化学法 / カルシウムイメージング / 膀胱 / SK3 / PDGFRα / P2Y1 / 免疫染色法 / カルシウムイメージ / ATP / FIB/SEM法 / 膀胱間質細胞 / FIB/SEM
Outline of Final Research Achievements

Localisation of cells expressing small-conductance Ca2+-activated K+ (SK3) channels in the urinary bladder was investigated, while putative roles of SK3 (+) cells in suppressing detrusor smooth muscle (DSM) spontaneous activity were explored. SK3 (+) cells co-expressing PDGFRα or vimentin were distributed in DSM bundles but not inter-bundle spaces or lamina propria. P2Y1 agonist (SK3 channel opener) caused a transient contraction in DSM. P2Y1 agonist increased the Ca2+ level suppressing spontaneous Ca2+ transients in neighboring DSM cells. Preferential localisation of SK3 positive cells in DSM bundles appears to indicate their functional interaction with DSM cells. However, increases in Ca2+ level of cells upon purinergic stimulation are not associated with the inhibition of Ca2+ or contractile activity in DSM cells. Thus, it is unlikely that the SK3-dependent hyperpolarisation generated in SK3 expressing PDGFRα (+) cells is transmitted to DSMs to suppress their excitability.

Academic Significance and Societal Importance of the Research Achievements

高齢化社会に伴い、排尿障害(過活動膀胱、低活動膀胱)の罹患率も増え社会問題化している。現在これらの疾患に対する薬物療法としては自律神経作動薬のみで、効果が薄い患者群もいるため神経作動薬以外の創薬が期待されている。
我々は膀胱壁内の間質細胞で筋束内に存在する間質細胞の機能に注目した。この細胞は自身の興奮を抑えるKチャネルを豊富に発現していることを免疫染色により発見した。これらの間質細胞の興奮が周辺の間質細胞の収縮抑制をするかをカルシウムイメージで観察するもその興奮伝達は観察されなかった。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (8 results)

All 2018 2016 2015

All Presentation (8 results) (of which Int'l Joint Research: 4 results)

  • [Presentation] Ca2+活性化SK3チャネルを発現する膀胱PDGFRα+間質細胞の組織内分布とP2Y1受容体刺激によるCa2+応答2018

    • Author(s)
      林 篤正
    • Organizer
      第106回日本泌尿器科学会総会
    • Related Report
      2017 Research-status Report
  • [Presentation] 膀胱壁内間質細胞を中心とした周辺組織の三次元構造解析2016

    • Author(s)
      林篤正、上村慶一郎、 平嶋伸悟、武谷三恵 、 金澤知之進、太田啓介、中村桂一郎、 井川掌
    • Organizer
      第23回日本排尿機能学会
    • Place of Presentation
      東京国際フォーラム
    • Year and Date
      2016-12-06
    • Related Report
      2016 Research-status Report
  • [Presentation] FIB/SEM tomographyを用いた尿路上皮下間質細胞の観察2016

    • Author(s)
      林篤正, 上村慶一郎, 平嶋伸悟, 金澤知之進, 武谷三恵, 太田啓介, 中村桂一郎, 井川掌
    • Organizer
      日本分子形態学会
    • Place of Presentation
      熊本
    • Year and Date
      2016-09-23
    • Related Report
      2016 Research-status Report
  • [Presentation] Three-dimensional observation of suburothelial interstitial cell by FIB/SEM tomography2016

    • Author(s)
      Hayashi T, Uemura K, Hirasima S, Kanazawa T, Takeya M, Ohta K, Nakamura K, Igawa T
    • Organizer
      46th ICS annual meeting
    • Place of Presentation
      東京国際フォーラム
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Three-dimensional relationship between the bladder intramuscular interstitial cell and the axon innervated in the detrusor bundle by FIB/SEM tomography2016

    • Author(s)
      Hayashi T, Hirashima S, Ohta K, Nakamura K, Igawa S
    • Organizer
      AUA2016
    • Place of Presentation
      San diego CA USA
    • Year and Date
      2016-05-06
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Three-dimensional relationship between the bladder intramuscular interstitial cell and the axon innervated in the detrusor bundle by FIB/SEM tomography2016

    • Author(s)
      林 篤正
    • Organizer
      AUA 2016
    • Place of Presentation
      San diego
    • Year and Date
      2016-05-06
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] モルモット排尿筋間に存在する間質細胞のFIB/SEMを用いた超微細3次元形態評価2015

    • Author(s)
      林 篤正
    • Organizer
      日本臨床分子形態学会
    • Place of Presentation
      長崎大学医学部良順会館
    • Year and Date
      2015-09-18
    • Related Report
      2015 Research-status Report
  • [Presentation] The expression of small conductance calcium-activated potassium (SK3) channel is specifically concentrated at interstitial cells of the spaces between detrusor smooth muscle cells in the guinea pig urinary bladder2015

    • Author(s)
      林 篤正
    • Organizer
      Multicellular Inputs Regulating Muscle Excitability
    • Place of Presentation
      Rino Nevata
    • Year and Date
      2015-06-14
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2020-03-30  

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