Psychopharmacology

, Volume 108, Issue 1–2, pp 27–32 | Cite as

Effect of ACTH, adrenalectomy and the combination treatment on the density of 5-HT2 receptor binding sites in neocortex of rat forebrain and 5-HT2 receptor-mediated wet-dog shake behaviors

  • Yasukazu Kuroda
  • Masahiko Mikuni
  • Tetsuo Ogawa
  • Kiyohisa Takahashi
Original Investigations

Abstract

The effect of ACTH and/or adrenalectomy on serotonin (5-HT)2 receptor binding sites was evaluated in the neocortex of rat forebrain. One day after the adrenalectomy or sham operation, ACTH (50 µg/day) was injected subcutaneously into adult male SD rats for 10 consecutive days. Saturation analysis showed that subchronic ACTH treatment significantly increased the Bmax values for3H-ketanserin binding without any change in the Kd values. Moreover, this ACTH-induced increase in the Bmax values was prevented by adrenalectomy. The concentrations of 5-HT and 5-hydroxyindole acetic acid (5-HIAA) measured by HPLC-ECD were not altered by these manipulations. Ten-day administration of corticosterone (20 and 50 mg/kg) also increased 5-HT2 receptor density in the neocortex of rat forebrain. 5-HT2 (and 5-HT1C) receptor agonist, (±)DOI-induced wet-dog shakes in ACTH and/or adrenalectomy-treated rats were also examined. Ten-day administration of ACTH enhanced (±)DOI-induced wet-dog shakes and this increase was prevented by adrenalectomy. These results indicate that subchronic adrenocorticotropinadrenal axis activation of rats increases both the number of 5-HT2 receptors in neocortex of forebrain and the wet-dog shake responses induced by (±)DOI.

Key words

Serotonin-2 (5-HT2) binding site Ketanserin ACTH Corticosterone Adrenalectomy DOI Wet-dog shakes 

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Yasukazu Kuroda
    • 1
    • 2
  • Masahiko Mikuni
    • 1
  • Tetsuo Ogawa
    • 1
  • Kiyohisa Takahashi
    • 1
  1. 1.Division of Mental Disorder ResearchNational Institute of Neuroscience, NCNPTokyoJapan
  2. 2.Department of NeuropsychiatryTokyo Medical and Dental University School of MedicineTokyoJapan

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