Effects of single cyclosporin A pretreatment on pentylenetetrazol-induced convulsion and on TRE-binding activity in the rat brain

Masato Asanuma, Sakiko Nishibayashi, Yoichi Kondo, Emi Iwata, Masaaki Tsuda, Norio Ogawa

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Using electrophoretic mobility-shift assay (EMSA), we examined changes in DNA-binding activities of transcriptional factor-activated protein-1 (AP-1), which is a Fos-Jun protein complex, onto its responsive element THE in the hippocampus and amygdaloid nucleus of rats stimulated with pentylenetetrazol (PTZ) injection, and also investigated the effects of a single administration of the immunosuppressant cyclosporin A (CsA). In EMSA with nuclear extracts from the rat brain, the TRE-binding activity of AP-1 in the hippocampus and amygdaloid nucleus markedly increased 2 h after the PTZ injection (75 mg/kg, i.p.). These PTZ-induced increases of the TRE-binding protein in these regions were completely suppressed by pretreatment with CsA (5 mg/kg, s.c.) 1 h before the PTZ injection. In addition, the administration of CsA significantly ameliorated PTZ-induced convulsion. This therapeutic effect of single CsA pretreatment may be based, in part, on the effects on the TRE-binding activity of AP-1 in the brain. Since single pretreatment of CsA in the present study had no effect on the PTZ-induced induction of c-fos mRNA, c-jun mRNA, Fos protein nor Jun protein, the inhibitory effects of single CsA administration on PTZ-induced TRE-binding activity in the brain may be related to the effects of CsA on AP-1 itself. These results suggest that an immune response via activation of transcriptional factor in the brain tissue is involved in the convulsion.

Original languageEnglish
Pages (from-to)29-36
Number of pages8
JournalMolecular Brain Research
Issue number1
Publication statusPublished - Oct 1995



  • AP-1
  • Convulsion
  • Cyclosporin A
  • Electrophoretic mobility-shift assay
  • Pentylenetetrazol
  • Rat brain
  • TRE

ASJC Scopus subject areas

  • Molecular Biology
  • Cellular and Molecular Neuroscience

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