, Volume 110, Issue 1–2, pp 140–144

Effects of repeated mild stress and two antidepressant treatments on the behavioral response to 5HT1C receptor activation in rats

  • Jean-Luc Moreau
  • François Jenck
  • James R. Martin
  • Sabine Perrin
  • Willy E. Haefely
Original Investigations


This study investigated the possible involvement of 5HT1C receptors in the development of depressive states and in the mode of action of antidepressants. The effects of repeated unpredictable mild stress (a regimen known to induce an anhedonic state in the rat) and of chronic administration of either of two recognized antidepressant treatments (sleep deprivation or inhibition of monoamine oxidase type A) in rats were studied on a 5HT1C receptor initiated response, i.e. mCPP-induced penile erection. A 3-week period of repeated, but unpredictable exposure to mild stressors induced a shift to the left of the dose-response curve for mCPP-induced penile erection. In contrast, 72-h REM sleep deprivation resulted in a shift to the right of the mCPP dose-response curve and 10-day administration of the monoamine oxidase type A inhibitor moclobemide (20 mg/kg IP bid) also resulted in a decreased number of mCPP-induced penile erections. These findings support the hypothesis that neuronal activities initiated via 5HT1C receptor stimulation may play a role in the pathophysiology and treatment of depression.

Key words

Mild stress Antidepressants REM sleep deprivation Chronic treatment 5HT1C receptor Penile erection MAO inhibitor Moclobemide 


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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • Jean-Luc Moreau
    • 1
  • François Jenck
    • 1
  • James R. Martin
    • 1
  • Sabine Perrin
    • 1
  • Willy E. Haefely
    • 1
  1. 1.Pharma DivisionPreclinical Research, F. Hoffmann-La RocheBaselSwitzerland

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