Behavior and severity of adjuvant arthritis in four rat strains

Mirjana Dimitrijevic*, Olgica Laban, Veljko J. Djuric, Stanislava Stanojevic, Tatjana Miletic, Vesna Kovacevic-Jovanovic, Cedomir Todorovic, Jelena Radulovic

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Previous research has suggested that behavioral traits of the histocompatible Lewis and Fischer strains of rats could be related to the difference in their susceptibility to adjuvant arthritis (AA). In the present study, the predictive value of behavioral markers in susceptibility to AA was investigated in nonhistocompatible inbred DA, Lewis, Albino Oxford (AO), and outbred Wistar strain. Behavioral profiles (open filed test and forced swim test) were determined prior to immunization with a single intradermal injection of complete Freund's adjuvant. Animals were daily scored for clinical signs of AA. The occurrence of certain behaviors and clinical indices of AA was significantly associated with strain membership. Discriminant analysis identified strain-related behavioral and illness profiles with very few overlaps among the phenotypes. Discriminant classification significantly exceeded the proportion of cases, which could have been correctly classified on the basis of chance. Open field behavior, in particular, exploration and grooming, differentiated among AA-susceptible and AA-resistant strains. Multiple regression analysis indicated that severity of AA (maximum clinical sign) can be predicted by the latency time and grooming behavior in the open field independently of strain membership. No clear distinction between AA-susceptible and AA-resistant strains was found with respect to forced swim test immobility. It was concluded that (a) strain-related genetic predisposition is important for the expression of certain behavioral traits and for susceptibility to AA and (b) open field behaviors, particularly grooming and latency, predict susceptibility to AA across different rat strains.

Original languageEnglish (US)
Pages (from-to)255-265
Number of pages11
JournalBrain, Behavior, and Immunity
Issue number3
StatePublished - 2001


  • Adjuvant arthritis
  • Forced swim test
  • Genetic differences
  • Open field test
  • Rat

ASJC Scopus subject areas

  • Immunology
  • Endocrine and Autonomic Systems
  • Behavioral Neuroscience


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