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Gender differences in acute and chronic stress in Wistar Kyoto (WKY) rats

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Abstract

While females are considered more susceptible to depressive behavior, this assertion is not strongly supported by the experimental literature. Since stress contributes to depressive behavior, male and female Wistar Kyoto (WKY) rats were exposed to either one session (acute stress) or 5 sessions (chronic stress) of restraint plus cold in order to study depressive behavior in male and female rats. After their respective treatment exposure, rats were tested in the open field test (OFT) and for retention of a passive-avoidance (P-A) task. One stress session resulted in significant immobility in the OFT for males, whereas 5 sessions were required to produce similar immobility in female rats. Acute stress interfered with the retention of the P-A response for males, while both acute and chronic stress produced poor P-A responses in female rats. Food consumption decresed, progressively, as a function of stress sessions, in female rats, whereas feeding in males returned to control levels after five stress days. Both acute and chronic stress exacerbated the stress ulcer response in male rats, but not in female rats. Chronic, but not acute, stress resulted in an increase in serotonin transporter mRNA levels in the dorsal raphe nucleus of both male and, female rats. The general consensus from these data suggested that female rats were more vulnerable to chronic stress and consequently supported the notion that females may be more susceptible to stress induced behavioral depression.

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Authors and Affiliations

  1. University of the Sciences in Philadelphia, Philadelphia, PA

    Shanaz Tejani-Butt

  2. VA Medical Center, 21902, Perry Point, MD

    William P. Paré Ph.D., Greg R. Blair & Joseph Kluczynski

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  1. William P. Paré Ph.D.
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  2. Greg R. Blair
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  3. Joseph Kluczynski
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  4. Shanaz Tejani-Butt
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Correspondence to William P. Paré Ph.D..

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Paré, W.P., Blair, G.R., Kluczynski, J. et al. Gender differences in acute and chronic stress in Wistar Kyoto (WKY) rats. Integrative Physiological and Behavioral Science 34, 227–241 (1999). https://doi.org/10.1007/BF02688691

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