Effects of the CRF1 antagonist SSR125543A on aggressive behaviors in hamsters

Catherine Farrokhi, D. Caroline Blanchard, Guy Griebel, Mu Yang, Coty Gonzales, Chris Markham, Robert J. Blanchard

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Corticotropin-releasing factor (CRF) and its receptor subtypes have been implicated in endocrine and behavioral responsivity to stress and emotion, including fear, anxiety, and aggression. SSR125543A is a new nonpeptide selective antagonist at the CRF1 receptor that has been shown to produce an anxiolytic-like effect in a number of animal models of anxiety. The present study investigated effects of an oral dose of 10, or 30 mg/kg of SSR125543A on aggressive behaviors of resident male Syrian hamsters toward male intruders. The high dose (30 mg/kg) of the CRF1 receptor antagonist produced a higher latency to bite and lower lateral attack frequencies and chase durations, indicating a reduction in aggression toward intruders in resident hamsters. The same dose of SSR125543A also enhanced frequency and duration of olfactory investigation, indicating that neither avoidance of the opponent nor deficiency in social activity is responsible for the reduction in aggression seen in these animals.

Original languageEnglish (US)
Pages (from-to)465-469
Number of pages5
JournalPharmacology Biochemistry and Behavior
Issue number3
StatePublished - Mar 2004
Externally publishedYes


  • Agression
  • Anxiolytic-like effect
  • Corticotropin-releasing factor

ASJC Scopus subject areas

  • Biochemistry
  • Behavioral Neuroscience
  • Pharmacology


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