Behavior Genetics

, 39:48 | Cite as

Diverse Sensitivity of RHA/Verh and RLA/Verh Rats to Emotional and Spatial Aspects of a Novel Environment as a Result of a Distinct Pattern of Neuronal Activation in the Fear/Anxiety Circuit

  • Ksenia Z. Meyza
  • Pawel M. Boguszewski
  • Evgeni Nikolaev
  • Jolanta Zagrodzka
Original Research


Psychogenetically selected Roman high (RHA/Verh) and Roman low (RLA/Verh) avoidance rats constitute a well-recognized model of diverse emotional reactivity. The two Swiss lines display marked behavioral and endocrine differences in reaction to a novel environment. In our study we found that these differences are accompanied by a distinct, line-specific pattern of neuronal activation within the fear/anxiety circuit. We have compared the c-Fos protein expression in the medial prefrontal cortex (mPFC), basolateral (BLA), central (CeA), medial (MeA), and cortical (CoA) nuclei of amygdala, paraventricular nucleus of the hypothalamus (PVN), and CA1, CA2, and CA3 fields of the hippocampus upon exposure to a novel situation of different stressorgeneity (open field with illuminated center, elevated plus maze, hole board test and acute restraint). Profound between-line differences in the sensitivity to emotional and spatial aspects of the behavioral challenge were observed for tests measuring spontaneous behavior. This effect seems to reflect different motivational factors driving the rat behavior, which clearly suggests that the diverse emotional reactivity of RHA/Verh and RLA/Verh rats is a result of different activation of the fear/anxiety circuit.


RHA/Verh–RLA/Verh rats Spontaneous behavior PCA analysis Emotional reactivity c-Fos protein expression Fear/anxiety circuit 



We would like to thank Dr. Thierry Steimer from the Laboratoire de Recherches Unité de Psychopharmacologie Clinique (APSIC), Hôpitaux Universitaires de Geneve for generous donation of Roman High Avoidance (RHA/Verh) and Roman Low Avoidance (RLA/Verh) for this study. We would also like to thank Dr. Ewelina Knapska and Dr. Mark Hunt for their comments on the manuscript and Maciek Olszewski for the technical assistance. This work was supported by State Committee for Scientific Research (KBN) grant no. 2PO4C03826.


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Ksenia Z. Meyza
    • 1
  • Pawel M. Boguszewski
    • 2
  • Evgeni Nikolaev
    • 3
  • Jolanta Zagrodzka
    • 1
  1. 1.Department of Neurophysiology, Nencki Institute of Experimental BiologyPolish Academy of SciencesWarsawPoland
  2. 2.Department of PsychologyYale UniversityNew HavenUSA
  3. 3.Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental BiologyPolish Academy of SciencesWarsawPoland

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