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Analysis of inhibitory mechanisms on Ca^<2+>-dependent K^+ channel influenced by exposure to a time-varying strong magnetic field.

Research Project

Project/Area Number 09680526
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 環境影響評価(含放射線生物学)
Research InstitutionThe University of Tokushima

Principal Investigator

IKEHARA Toshitaka  The University of Tokushima, Department of Physiology.Assistant Professor, 医学部, 講師 (40111033)

Co-Investigator(Kenkyū-buntansha) AIZAWA Katsuo  Tokyo Medical College, Department of Physiology, Professor, 医学部, 教授 (40074645)
HOSOKAWA Keiko  The University of Tokushima, Department of Physiology, Research Associate, 医学部, 助手 (10116858)
YAMAGUCHI Hisao  The University of Tokushima.Department of Physiology.Associate Professor., 医学部, 助教授 (90035436)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordstime-varying strong magnetic field / HeLa cells / adrenal chromaffin cells / bradykinin / intracellular Ca^<2+> / Ca^<2+>-dependent K^+ channel / endoplasmic reticulum / inositol triphosphate / 副腎髄質クロマフィン細胞 / 変動磁界 / プラディキニン / 細胞内カルシウムイオン濃度 / 誘導電流 / K^+チャネル / FT-IR赤外分光 / クロマフィン細胞 / 細胞膜蛋白質
Research Abstract

We tested the effects of exposure to following two magnetic fields (MF) on cultured cells.
(a) A time-varying MF changing between 0.07 and 1.7 T at an interval of 3 sec.
(b) Extremely-low-frequency (ELF) ME (800 gauss, 50 Hz).
(1) Effects of ME (a) on HeLa cells :
K^+ uptake was activated and the intracellular Ca^<2+> concentration was increased by replacement of normal medium to high K^+ medium. A membrane-permeable Ca^<2+> chelating agent and Ca^<2+>-dependent K^+ channel inhibitors were found to reduce the K^+ uptake. Exposure to the MF partly inhibited the drug-sensitive K^+ uptake and completely suppressed the increase in intracellular Ca^<2+> in the high K^+ medium. But the inhibition of K^+ uptake by the MF was not restored by addition of Ca^<2+> ionophore. The suppression of K^+ fluxes could relate to a change in electric properties of cell surface and an inhibition of Ca^<2+> influx or Ca^<2+> release from cellular Ca^<2+> stores.
(2) Analysis of ELF MF(b) effects on HeLa cells by FT-IR spectra :
In analysis of the spectra of the 1500-1700 cm^<-1> region, absorbance of amide II mode (1540 cm-1)was decreased and a band about 1600 cm^<-1> was increased instantly by the MF.Increase in absorbance of the latter band reveals the increase on C=O symmetric vibration of free carboxyl. This results suggest changes in the protein structure of cell membrane and electric properties of cell surface.
(3) Effects of ELF MF(a) on bovine adrenal chromaffin cells :
We tested the effects of exposure to the time-varying MF(a) on transient increase in intracellular Ca^<2+> stimulated by bradykinin in chromaffin cells. Addition of bradykinin induced the increase in intracellular Ca^<2+> within few minutes.
The exposure to the MF perfectly suppressed thc increase in cellular Ca^<2+> in Ca^<2+>-free medium. The inhibition occurred for 15 rain when the maximum magnetic flux density was more than 1.4 T.These results suggest that the exposure inhibits Ca^<2+> release from cellular vesicles.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] 朴 基豪他: "変動強磁界が及ぼす細胞膜1価イオン輸送への影響" 日本生体磁気学会雑誌. 9. 55-62 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikehara,T.et al.: "Effects of strong magnetic fields on membrane ion transport of cultured cells" Tech.Rep.IEICE. MBE97-40. 7-12 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hayashi,J.et al.: "Change in chemical composition of lipids accumulated in atheromas of rabbits following photodynamic therapy." Lasers.Surg.Med.21. 287-293 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikehara,T.et al.: "Effects of a time-varying strong magnetic field on transient increase in cytosolic free-Ca^<2+> by bradykinin in cultured bovine adrenal chromaffin cells." FEBS Letters. 435. 229-232 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikehara,T.et al.: "Effects of electromagnetic fields on membrane ion transport of cultured cell." J.Med.Inv.45. 47-56 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 池原敏孝他: "培養細胞内Ca^<2+>に及ぼす変動磁界の影響" 電気学会マグネティックス研究会資料. MAG-98-144. 67-70 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 池原敏孝他: "実用分光法シリーズIV-分光学の医学応用" アイピーシー, ((in press))

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Park,Ki Ho et al.: "Elect.Magnet.Biol.Med." Plenum Press, ((in press))

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Park, K.H., Kinouchi, Y., Ikehara, T., Yamaguchi, H., Yoshizaki, K., Miyamoto, H.: "Effects of time-varying magnetic fields on K^+ uptake in HeLa cells" J.Jpn.Biomagnet.Bioelectromag.Society. 9 (2). 55-62 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikehara, T., Park, K.H., Kinouchi, Y., Yamaguchi, H., Yoshizaki, K., and Miyamoto, H: "Effects of strong magnetic fields on membrane ion transport of cultured cells." Tech.Rep.IEICE. MBE97-40. 7-12 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hayashi, J., Saito, T., Aizawa, K.: "Change in chemical composition of lipids accumulated in atheromas of rabbits following photodynamic therapy." Lasers.Surg.Med.21 (3). 287-93 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikehara, T., Park, K.H., Houchi, H., Yamaguchi, H., Hosokawa, K., Shono, M., Minakuchi, K., Tamaki, T., Kinouchi, Y., Yoshizaki, K.and Miyamoto, H.: "Effects of time-varying strong magnetic field on transient increase in cytosolic free-Ca^<2+> by bradykinin in cultured bovine adrenal chromaffin cells." FEBS Lett.435 (2-3). 229-232 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikehara, T., Yamaguchi, H., and Miyamoto, H.: "Effects of electromagnetic fields on membrane ion transport of cultured cell." Journal of Medical Investigation. 45 (1-4). 47-56 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikehara, T., Hosokawa, K., Yamaguchi, H., Park, K.H., Kinouchi, Y., Houchi, H., Yoshizaki, K., Miyamoto, H.: "Effects of time-varying magnetic field on intracellular Ca^<2+> in cultured cells." Denkigakkai-Kenkyukai-shiryou. MAG-98-144. 67-70 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikehara, T., Yamaguchi, H., Aizawa, K: Jituyou-Bunkouhou Series IV-Bunnkougaku no Igaku-ouyo. Eds.by Aizawa et al., IPC, (in press),

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Park, K.H., Ikehara, T., Kinouchi, Y., Yamaguchi, H.and Miyamoto, H.: Elect.Magnet.Biol.Med., Effects of time-varying strong magnetic field on K^+ uptake through Ca^<2+>-dependent K^+ channel.Ed.by F.Bersani, Plenum Press, (in press),

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikehara,T.et al.: "Effects of a time-varying strong,magnetic field on trasient increase in cytosolic free-Ca by bradykinin in cultured bovine adrenal chromaffin cells." FEBS Letters. 435(2-3). 229-232

    • Related Report
      1998 Annual Research Report
  • [Publications] Ikehara,T.et al.: "Effects of electromagnetic fields on membrane ion trasport of cultured cell." J.Med.Inv.45(1-4). 47-56

    • Related Report
      1998 Annual Research Report
  • [Publications] 池原敏孝他: "培養細胞内Caに及ぼす変動磁界の影響" 電気学会マグネティックス研究会資料 MAG-98-144. 67-70

    • Related Report
      1998 Annual Research Report
  • [Publications] Park,Ki Ho et al.: "Effects of time-varying strong magnetic field on K uptake through Ca-dependent K channel." Elect.Magnet.Biol.Med.(in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] 池原敏孝他: "実用分光法シリーズIV-分光学の医学応用" アイピーシー(in press),

    • Related Report
      1998 Annual Research Report
  • [Publications] Ai-Wu Pan et al.: "Blood flow in the carotid artery during breath-holding in relation to diving bradycardia." Eur.J.Appl.Physiol.75. 388-395 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 朴基豪 他: "変動強磁界が細胞膜イオン輸送に及ぼす影響" 日本生体磁気学雑誌. 10. 114-115 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Ikehara,T.et al.: "Effects of strong magnetic fields on membrane ion transport of cultured cells." Technical Report of IEICE. MBE97-40. 7-12 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Hayashi,J.et al.: "Change in chemical composition of lipids accumulated in atheromas of rabbits following photodynamic therapy." Lasers in Surgery and Medicine. 21. 287-293 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Hosokawa,K.et al.: "Role of cyclin B on growth recovery by addition of insulin and LDL in K+depleted synchronized HeLa cells" Jpn.J.Physiol.47. S46 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Ikehara,T.et al.: "Effects of magnetic fields on Ca^<2+>-dependent K^+ channel in HeLa cells" Jpn.J.Physiol.47. S57 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Park,K.H.et al.: "Electricity and Magnetism in Biology and Medicine," Plenum Press(in press),

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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