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Logo of behbrainBioMed CentralBiomed Central Web Sitesearchsubmit a manuscriptregisterthis articleBehavioral and Brain Functions : BBFJournal Front Page
 
Behav Brain Funct. 2008; 4: 23.
Published online Jun 2, 2008. doi:  10.1186/1744-9081-4-23
PMCID: PMC2424057
Context and strain-dependent behavioral response to stress
Katarzyna Nosek,1 Kristen Dennis,1 Brian M Andrus,1 Nasim Ahmadiyeh,1,2 Amber E Baum,1,3 Leah C Solberg Woods,1,4 and Eva E Redeicorresponding author1
1Northwestern University Feinberg School of Medicine, The Asher Center, Department of Psychiatry and Behavioral Sciences, Chicago, IL 60611, USA
2Brigham and Womens Hospital, 75 Francis St, and Dana-Farber Cancer Institute, 44 Binney St, Boston, MA 02115, USA
3National Institute of Health, 9000 Rockville Pike, Building 35, Room 1A207, Bethesda, MD 20892, USA
4Medical College of Wisconsin, 8701 Watertown Plank Road, CRI/TBRC Room C2415, Milwaukee, WI 53226, USA
corresponding authorCorresponding author.
Katarzyna Nosek: kmn/at/uchicago.edu; Kristen Dennis: k-dennis/at/northwestern.edu; Brian M Andrus: b-andrus/at/northwestern.edu; Nasim Ahmadiyeh: nahmadiyeh/at/partners.org; Amber E Baum: bauma/at/mail.nih.gov; Leah C Solberg Woods: lsolberg/at/mcw.edu; Eva E Redei: e-redei/at/northwestern.edu
Received January 4, 2008; Accepted June 2, 2008.
Abstract
Background
This study posed the question whether strain differences in stress-reactivity lead to differential behavioral responses in two different tests of anxiety. Strain differences in anxiety-measures are known, but strain differences in the behavioral responses to acute prior stress are not well characterized.
Methods
We studied male Fisher 344 (F344) and Wistar Kyoto (WKY) rats basally and immediately after one hour restraint stress. To distinguish between the effects of novelty and prior stress, we also investigated behavior after repeated exposure to the test chamber. Two behavioral tests were explored; the elevated plus maze (EPM) and the open field (OFT), both of which are thought to measure activity, exploration and anxiety-like behaviors. Additionally, rearing, a voluntary behavior, and grooming, a relatively automatic, stress-responsive stereotyped behavior were measured in both tests.
Results
Prior exposure to the test environment increased anxiety-related measures regardless of prior stress, reflecting context-dependent learning process in both tests and strains. Activity decreased in response to repeated testing in both tests and both strains, but prior stress decreased activity only in the OFT which was reversed by repeated testing. Prior stress decreased anxiety-related measures in the EPM, only in F344s, while in the OFT, stress led to increased freezing mainly in WKYs.
Conclusion
Data suggest that differences in stressfulness of these tests predict the behavior of the two strains of animals according to their stress-reactivity and coping style, but that repeated testing can overcome some of these differences.
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