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Journal of Pharmacology and Experimental Therapeutics

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OtherCELLULAR AND MOLECULAR PHARMACOLOGY

Epileptic Activity Prevents Synapse Formation of Hippocampal Mossy Fibers via L-Type Calcium Channel Activation In Vitro

Yuji Ikegaya, Masatoshi Yoshida, Hiroshi Saito and Nobuyoshi Nishiyama
Journal of Pharmacology and Experimental Therapeutics January 1997, 280 (1) 471-476;
Yuji Ikegaya
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Masatoshi Yoshida
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Hiroshi Saito
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Nobuyoshi Nishiyama
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Abstract

Hippocampal slice from early postnatal rat was used to elucidate the influence of epileptic activity elicited by picrotoxin on synapse formation of mossy fibers. Neurite reelongation and synaptogenesis of mossy fibers transected at 8 days in vitro were confirmed by staining with DiI, a fluorescent membrane dye used as a neuronal tracer, and by recording field excitatory postsynaptic potentials (fEPSP) in the CA3 region evoked by stimulation of the dentate gyrus. Picrotoxin (50 μM), which evoked spontaneous epileptiform firing in the CA3 region that was occluded by tetrodotoxin (1 μM), hindered development of fEPSP amplitude after a lesion of mossy fibers. Furthermore, observations using a Timm method, a histochemical technique that preferentially labels synaptic terminals of mossy fibers, revealed that picrotoxin prevented synaptogenesis in the CA3 region. This inhibitory effect of picrotoxin was completely abolished by tetrodotoxin or nicardipine (10 μM), a L-type calcium channel blocker, but not by 2-amino-5-phosphonopentanoic acid (50 μM), a N-methyl-d-aspartate receptor antagonist, suggesting that influx of calcium ion via L-type calcium channels during epileptic bursts mediated the disturbance of appropriate synapse formation of mossy fibers.

Footnotes

  • Send reprint requests to: Dr. Nobuyoshi Nishiyama, Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, The University of Tokyo, 7–3-1 Bunkyo-ku, Tokyo 113, Japan.

  • Abbreviations:
    ACSF
    artificial cerebrospinal fluid
    AP5
    2-amino-5-phosphonopentanoic acid
    DIV
    day in vitro
    fEPSP
    field excitatory postsynaptic potential
    GABA
    γ-aminobutyric acid
    NMDA
    N-methyl-d-aspartate
    DiI
    3,3′-dilinolenyloxacarbocyanin perchlorate
    • Received April 18, 1996.
    • Accepted September 13, 1996.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics
Vol. 280, Issue 1
1 Jan 1997
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OtherCELLULAR AND MOLECULAR PHARMACOLOGY

Epileptic Activity Prevents Synapse Formation of Hippocampal Mossy Fibers via L-Type Calcium Channel Activation In Vitro

Yuji Ikegaya, Masatoshi Yoshida, Hiroshi Saito and Nobuyoshi Nishiyama
Journal of Pharmacology and Experimental Therapeutics January 1, 1997, 280 (1) 471-476;

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OtherCELLULAR AND MOLECULAR PHARMACOLOGY

Epileptic Activity Prevents Synapse Formation of Hippocampal Mossy Fibers via L-Type Calcium Channel Activation In Vitro

Yuji Ikegaya, Masatoshi Yoshida, Hiroshi Saito and Nobuyoshi Nishiyama
Journal of Pharmacology and Experimental Therapeutics January 1, 1997, 280 (1) 471-476;
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