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Studies on intracellular signal transduction mechanism in renal tubular cells.

Research Project

Project/Area Number 03454123
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field General physiology
Research InstitutionOsaka Medical College

Principal Investigator

FUJIMOTO Mamoru  Osaka Medical College, School of Medicine, Professor, 医学部, 教授 (70084803)

Co-Investigator(Kenkyū-buntansha) KUBOKAWA Manabu  Osaka Medical College, School of Medicine, Instructor, 医学部, 助手 (70153327)
KOTERA Kunihiko  Osaka Medical College, School of Medicine, Associate Professor, 医学部, 助教授 (00084905)
Project Period (FY) 1991 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1992: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1991: ¥3,100,000 (Direct Cost: ¥3,100,000)
KeywordsAngiotensin II / Catecholamine / Tubular Na transport / cyclic AMP / Urinary acidification / Ion channel / Intracellular pH / Intracellular Ca / OK細胞 / 単離尿細管細胞 / パッチクランプ実験 / Clチャネル / Kチャネル / 細胞容積調節 / 細胞内シグナル伝達 / 細胞内Na / アンギオテンシンーII / ノルエピネフリン / 腎尿細管細胞
Research Abstract

To investigate the intracellular mechanism of signal transduction for the action of neural and humoral control in the renal proximal tubule, we employed two electrophysiological techniques., The one was direct micropuncture of ion-selective microelectrodes into in vivo bullfrog tubular cells with or without a combined use of fluorescent dye to analyze cellular ion concentrations in bullfrog kindney, and the other was the patch-clamp techniques applied to cultured opossum kidney (OK) cells of proximal tubular origin to analyze the ion channel activities in vitro. The micropuncture data showed that physiological concentration of angiotensin II(10^<-11>-10^<-12> M) cnhanced 1)acidification of proximal tubular urine by stimulating luminal Na^+/H^+ exchange mechanism, and 2)Na^+ and water reabsorption by increasing luminal permeability to Na^+. These two effects were associatedwith the suppression of cellular cyclic AMP via alpha_2 receptor mechanism. The higher concentration of angiotensin II (>10^<-10> M) caused an increment of intracellular Ca^<2+> by extra-stimulation of alpha_1 mechanism, resulting in a suppression of Na^+ and water reabsorption. The fluorescent dye technique with Acridine Orange was useful to detect the change of subcellular vesicles more strongly stained red color with the increased level of intracellular cyclic AMP, which indicates the accumulation of H^+ within the vesicle. Noradrenaline and dopamine caused acceleration and inhibition of Na^+ reasorption and H^+ secretion in the proximal tubule, depending on the level of cyclic AMP via stimulation or inhibition of alpha_2 receptor mechanism, respectively. In patch clamp studies, we found that both K^+ and C1 channel were activated when cells were imposed on hyposmotic stress. The pH-sensitive K^+ channels (70 pS), Ca^<2+> -activated K^+ channels (30 pS), pH-sensitive C1 cha

Report

(4 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • 1991 Annual Research Report
  • Research Products

    (39 results)

All Other

All Publications (39 results)

  • [Publications] Fujimoto M: "Ion-selective microelectrodes to study proton and bicarbonate transport in the renal epithelium." Kidney Int. 40(Suppl33). S23-S28 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kubokawa M: "Ionomycin increases potassium conductance of perfused bullfrog proximal tubule." Bull Osaka Med Coll. 37. 13-23 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fujimoto M: "Ionic background on vesicle ransport of bullfrog tubular cells.-A study of electron probe X-ray microanalysis-." Bull Osaka Med Coll. 37. 25-35 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kubokawa M: "Acid-induced two-step depolarization in the peritubular membrane of bullfrog kidney proximal tubules." Jpn J Physiol. 42. 389-406 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kubokawa M: "Cell alkalinization enhances K conductance of proximal tubular cell membranes." Bull Osaka Med Coll. 38. 1-13 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Mori Y: "Intracellular acidification inhibits the action of Cl^- channels induced by a hypotonic shock in opossum kidney cells." Bull Osaka Med Coll. 39. 9-17 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ohno-Shosaku T: "Nephrology vol II" Hatano M, 861 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fujimoto M: "Advances in physiological sciences" Manchanda S K,Selvamurthy W & Mohan Kumar V, 768 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fujimoto M., Kubata T., Hagiwawa N., Ohno-Shosaku T., Kubokawa M.& Kotera K.: "Ion-selective microelectrodes to study proton and bicarbonate transport in the renal epithelium" Kidney Int. 40(Suppl 33). S23-S28 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kubokawa M., Kubota T., Hagiwara N.& Fujimoto M: "Ionomycin increases potassium conductance of perfused bullgrog prozimal tubule." Bull Osaka Med Coll. 37. 13-23 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fujimoto M., Sasaki S., Nakagaki I., Kotera K.& Imai Y.: "Ionic background on vesicle transport of bullfrog trubular cells. - A study of electron probe X-rqy microanalysis-" Bull Osaka Med Coll. 37. 25-35 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fujimoto M., Kubota T., Hagiwara N., Ohno-Shosaku T., Kubokawa M.& Kotera K.: "Mechanism of acidification in the renal proximal tuvules. In * Ionic basis and energy metabolism of epithelial transport. Ed : M Murakami, Y., Seo, A Kuwahara & H.Watari" National Institute for Physiological Sciences, Okazaki. pp67-70 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kubokawa M., Kubota T., Hagiwara N., Ohno-Shosaku T., Kotera K.& Fujimoto M.: "Role of intracellular pH and calcium in regulation of the potassium permeability of cell membrance in bullfrog proximal tubule. In : Ionic basis and energy metabolism of epithelial transport. Ed : M Murakami, Y Seo, A Kuwahara & H Watari" National Institute for Physiological Sciences, Okazaki. pp85-86 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Mori Y, Ohno-Shosaku T, Yamaguchi J, Kotera K & Fujimoto M: "Properties of cholride channels in opossum kindney cells In : Ionic basis and energy metabolism of epithelial transport. Ed : M Murakami, Y Seo, A Kuwahara & H Watari" National Institute for Physiological Sciences, Okazaki. pp87-88 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kubokawa M, Kubota T, Kotera K & Fujimoto M: "Acidinduced two-step depolarization in the pertubular membrance of bullfrog kidney proximal tubules." Jpn J Physiol. 42. 389-406 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kubokawa M, Kubota & Fujimoto M: "Cell alkalinization enhances K conductance of proximal tubular cell membranes." Bull Osaka Med Coll. 38. 1-13 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fujimoto M, Kubota T, Hagiwara N, Ohno-Shosaku T, Kubokawa M & Kotera K: "H ion secretory mechanism in the renal proximal tubule. In : Advances in physiological sciences. Ed : Manchanda S K, Selvamurthy W & Mohan Kumar V." Macmillan India Limited, New Delhi. pp71-78 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Mori Y, Kubokawa M & Fujimoto M: "Intracellular acidification inhibits the action of C1 channels induced by a hypotonic shock in opossum kidney cells." Bull Osaka Med Coll. 39. 9-17 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fujimoto M, Mori Y, Hagiwara N, Kubota T, & Kotera K: "Functional significance of K^+ and C1 channels in volume regulation in proximal tubular cells In : Proc 19th Seiriken Conference "C1 Channel : Molecular and Cellular Physiology" Ed : K Hama, Y Okada, S Yamagishi, N Akaike, A Noma & N Takeguchi" National Institute for Physiological Sciences, Okazaki. pp38-41 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ohno-Shosaku T., Kubota T., Mori Y., Yamaguchi J.& Fujimoto M.: Regulation of K^+ channels in proximal tubules : Studies in opossum kidney cells. In : Nephrology II Ed : M Hatano. Spring-Verlag, Tokyo, pp1677-1684 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] MoriY: "Intracellular acidification inhibits the action of Cl^- channels induced by a hypotonic shock in opossum kidney cells." Bull Osaka Med Coll. 39. 9-17 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] FujimotoM: "Role of intracellular pH in regulation of volume and ion transport across the proximal tubular cells." Abst XIIth Int Congr Nephrol. 119 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] FujimotoM: "Cross-talk between luminal and peritubular membranes in Na-sugar-cotransport in the proximal tubular cell." AbstXXXII Congr Int Union Physiol Sci. Monday. 81 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] MoriY: "Role of pH-sensitive ion chanels in regulation of cell volume and iontransport in the proximal tubular cells." AbstXXXII Congr Int Union Physiol Sci. Tuesday. 212 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] MoriY: "Effect of intracellular pH on volume sensitive Cl^- current in opossum kidney cells." Jpn J Physiol. 43. S51 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] FujimotoM: "Self-maintenance mechanism in renal proximal tubular cells." Jpn J Physiol. 43. S137 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Kubokawa M: "Acid-induced two-step depolarization in the peritubular membrane of bullfrog kidney proximal tubules." Jpn J Physiol. 42. 389-406 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Fujimoto M: "Ionic background on vesicle transport of bullfrog tubular cells.-A syudy of electron probe X-ray microanalysis-." Bull Osaka Med Coll. 38. (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Kubokawa M: "Cell alkalinization enhances K conductance of proximal tubular cell membrances." Bull Osaka Med Coll. 38. (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 藤本 守: "腎近位尿細管の自己維持活動" 第70回日本生理学会大会予稿集. 142- (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Fujimoto M: "Role of intracellular pH in regulation of cell volume and ion transport across the proximal tubular cells." XIIth Int Congr Nephrol. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Mori Y: "Role of PH-sensitive ion channels in regulation of cell volume and ion transport in the proximal tubular cells." XXXIInd Int Congr Physiol Sci. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Fujimoto M et al: "Ion-selective microelectrodes to study proton and bicarbonate transport in the renal epithelium." Kidney Int. 40 suppl 33. s23-s28 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 藤本 守他: "内在性腎機能調節と尿細管細胞シグナル伝達機構(第1報)" 第69回日本生理学会大会予稿集. 137 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Kubota T et al: "Effects of cathecholalmines on ion trasport in the frog kidey." Jpn J Physiol. 41 Suppl. s32 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 久保川 学他: "腎近位尿細管イオン輸送に対するアンギオテンシンーIIの作用" 日本生理学雑誌(学会抄録). 53. 445 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Kubokawa M et al: "Acid-induced two-step depolarization in the peritubular membrane of bullfrog kidney proximal tubules" Jpn J Physiol. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Fujimoto M.et al: "Ionic Basis and Energy Metabolism of Epithelial Transport." ed by Murakami M et al,Kenbun Printing Ltd(Okazaki), 238 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Ohno-Shosaku T.et al: "Nephrology Vol.II,Proc XIth Inter Congr Nephrol." ed by Hatano M,Springer-Verlag,Tokyo, 1748 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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