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Development of Inhibitory Pathways in the Rat Spinal Cord

Research Project

Project/Area Number 63480103
Research Category

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

Allocation TypeSingle-year Grants
Research Field Neurophysiology and muscle physiology
Research InstitutionUniversity of Tsukuba

Principal Investigator

KUDO Norio  Institute of Basic Medical Sciences, Professor, 基礎医学系, 教授 (60014239)

Co-Investigator(Kenkyū-buntansha) OKADO Nobuo  Univ. of Tsukuba, Inst. Basic Med. Sci., Associate Prof., 基礎医学系, 助教授 (50060140)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1990: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1989: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1988: ¥3,500,000 (Direct Cost: ¥3,500,000)
KeywordsSpinal cord / Inhibition / Development / Reflex / Locomotion / Rat / Fetus / In vitro / 脊髄切断 / リズム運動 / CPG / 興奮性アミノ酸 / 抑制効果 / 細胞内記録
Research Abstract

Development of inhibitory pathways in the lumbar spinal cord was investigated electrophysiologically using an isolated spinal cord preparation in fetal and new-born rats.
1. Development of inhibition in the reflex pathway : Intracellular recordings from lumbal motoneurones at different ages revealed that inhibitory postsynaptic potentials (IPSPs) following stimulation of the dorsal root first appeared at embryonic days (E) 16.5, 5 days before birth. The frequency of occurrence of IPSPs were less than that of excitatory postsynaptic potentials (EPSPs) in individual motoneurones at this stage, indicating that inhibitory pathways would develop later than excitatory ones in the reflex arc. Chronic transection of the lower thoracic cord at E15.5 could not affect the later development of the inhibitory pathways.
2. Development of inhibition in the rhythm generator : A neuronal circuit generating rhythmic motor activity was activated by bath application of N-methyl-D, L-aspartate (NMA). Rhythmic activities in the lumbar ventral roots first appeared at E15.5, though srychnine-sensitive inhibitoty action began toqfunction at E17.5 in this neuronal ciruit. The inhibition changed the pattern of activities in the ventral root on two sides from synchronized to alternating, as is the pattern of locomotion.

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (32 results)

All Other

All Publications (32 results)

  • [Publications] Kudo,N.: "Development of inhibitory pathways in the lumbar spinal cord of rats" J.Physiol.Soc.Jpn.50. 444- (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hongo,T.: "Spatial pattems of reflex evoked by pressure stimulation on the foot pads in cats" J.Physiol.420. 471-487 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] IIjima,T.: "Studies of longーterm potentiation in hippocampal slice with optical methods" Neurosci.Res.Suppl.11. S59- (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Ozaki,S.: "Spinal mechanisms of NMAーinduced rhythmic motor activity in the rat fetus" Neurosci.Res.Suppl.11. S35 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 工藤 典雄: "随意運動の機能分化一皮質脊髄路の発達" Clin.Neurosci.9. 49-51 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Ozaki,S.: "Spontaneous activity in spinal motoneurones in the rat fetus" Jap.J.Physiol.(1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 工藤 典雄: "脳のレセプタ-と運動" 永津 俊治他, 15 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kudo,N.: "Neurological basis of human locomotion" M.Shimamura et al., 10 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Aoyama, M., Hongo, T. and Kudo, N.: "Sensory input to oells of crigin of uncrossed spinocerebellar tract located below Clarke's column in the cat." J. Physiol.,. 398. 233-257 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kudo, N., Ozaki, S. and Yamada, T.: "Development of descending pathways to lumbar spinal motoneurones in rat fetuses." Neurosci. Res.,. Suppl. 7. 46 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kudo, N., Oguni, E. and Yashida, K.: "Morphological analysis of interneurones mediating reflexes from the hindlimb foot pads." J. Physiol. Soc. Jpn.,. 50. 445 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kudo, N., Ozaki S. and Yamada, T.: "Development of inhibitory pathways in the lumbar spinal cord of rats." J. Physiol. Soc. Jpn.,. 50. 444 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kudo, N. and Yamada, T.: "Functional development of the spinal cord." Bull. TWIN.16. 15-25 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hongo, T., Kudo, N., Oguni, E. and Yoshida, K.: "Spinal patterns of reflex evoked by pressure stimulation of the foot pads in cats." J. Physiol.,. 420. 471-487 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Ozaki, S. and Kudo, N.: "Spinal mechanisms of NMA-induced rhythmic motor acitivity in the rat fetus." Neurosci. Res.,. Supp. 11. 35 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] IIzuka, T., Ichikawa, M., Matsumoto, Y., Kudo, N. and Matsumoto, G.: "Studies of long-term potentiation in hippocampal slice with optical methods." Neurosci. Res.Suppl. 11. 59 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Ozaki, S., Iizuka, M. and Kudo, N.: "Spontaneous activity in spinal motoneurones in the rat fetus." Jap. J. Physiol.40 :. S217 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Matsumoto, Y., Iijima, T., Itchikawa, M., Kudo, N. and Matsumoto, G.: "Study of neuroplasticity in hippocampal slices by optical methods I." Jap. J. Physiol.40 :. S215 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kudo, N,: "Functional differentiation of voluntary movement : Development of the corticospinal tract. (Japanese)" Clin. Neurosci.,. 9 :. 49-51 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] IIzuka, M., Ozaki, S. and Kudo, N.: "Kynurenate insensitive responses evoked by spinal cord stimulation in lumbar motoneurones." Neurosci. Res.(1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Ozaki, S., Kudo, N. and Okado, S.: "Postnatal development of serotonin-, substance P- and enkephalin-like immunoreactive fibers in the motor nucleus of the rat spinal cord." Neurosci. Res.(1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kudo, N., Ozaki, S. and Yamada, T.: "Ontogeny of rhythmic activity in the spinal cord of the rat. In : Neurobiological basis of human locomotion. M. Shimamura et al. (Eds.)" Springer-Verlag, Berlin. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 工藤 典雄: "随意運動の機能分化ー皮質脊髄路の発達" Clinical Neuroscience. 9. 49-51 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Hongo: "Spatial patterns of reflex ovoked by pressure stimulation on the foot paas in cats" J.Phgsiol.420. 471-487 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.IIJIMA: "Studies of longーterm potentiation in hippocampal slice with aptical methods" Neurosci.Res.suppl.11. S59 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] S.Ozaki: "Spinal mechanisms of NMAーinduced rhythmic motor activity in the rat fetus" Neurosci.Res.suppl.11. S35 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] S.Ozaki: "Spontaneous activity in spinal motoneurones in the rat fetus" Jap.J.Physiol.(1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 工藤 典雄: "脳のレセプタ-と運動" 永津 俊治他, 15 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] N.Kudo: "Neurobiological basis of human lecomotion" M.Shimamura et al., 10 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Ozaki,S.and Kudo,N.: "Spinal mechanisms of NMA-induced rhythmic motor activity in the rat fetus." Neurosci.Res.(1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 工藤典雄: "新生理学大系:発生・分化の生理学:脊髄反射路の発生" 医学書院, 15 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Kudo,N.: J.Physiol.Soc.Jpn. 50. 444 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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