Cited by 250Stress Responses and CortisolMemory and Neural MechanismsNeurotransmitter Receptor Influence on Behavior

Sex Differences in Chronic Stress Effects on Memory in Rats

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Luine, Victoria·2002·Stress

Abstract

Recent studies in rodent models and in humans have shown that the status of both the gonadal and adrenal axes (hypothalamic-pituitary-gonadal, HPG and hypothalamic-pituitary-adrenal, HPA, respectively) can influence learning and memory function. In this article, the effects of activating the HPA axis (stress) on performance of memory tasks in rats are reviewed. More importantly, results are presented which show that chronic stress has a different impact on performance of these tasks depending upon the sex of the rat. These observations are novel and potentially important since few studies, animal or human, have utilized females as subjects in studies of the stress response. Sex differences in the effects of chronic stress on memory were investigated in rats using an object recognition task and two spatial memory tasks, radial arm maze and object location. Given the same chronic stress--21 days of restraint for 6 h each day--males were impaired in all of the memory tests while females showed enhanced performance of the spatial memory tasks and no changes in object recognition performance. Levels of neurotransmitters and metabolites were measured in brain areas important for cognition in the subjects in order to determine neural systems that may respond to stress and mediate the cognitive responses. These results show that responses of monoamine and amino acid containing neural systems may contribute to or underlie sex differences in stress effects on cognition. Stress decreased dopaminergic activity in the frontal cortex and amygdala of males but not females; whereas, in CA3 of the hippocampus, stress increased levels of 5-HT and norepinephrine in females, but not males, and increased GABA in males, but not females. Finally, a possible role for estradiol in mediating sexually differentiated responses to stress was examined. Behavioral and neurochemical evaluations in ovariectomized, stressed females, with or without estrogen replacement, suggest that sex differences in response to stress are influenced by both the organizing and activating effects of estradiol. A few, recent studies in humans, that show sexually dimorphic relationships between chronic stress and cognition, are also highlighted. These results in humans are consistent with the pattern of results in rats. Clearly, further studies are necessary to substantiate sex differences in stress effects on memory function in humans and to understand mechanisms whereby estrogen may influence the stress response in rats. Nonetheless, recent studies show sexually differentiated cognitive responses to chronic stress and underline the importance of considering the sex/gender of subjects when studying the stress response.

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  • Female rodents tend to be more susceptible to stress-induced dysfunction in emotional domains but show greater stress resilience in cognitive domains.

    “while female rodents tend to be more susceptible to stress–induced dysfunction in emotional domains (i.e., sucrose preference and forced swim test), they tend to show a greater degree of stress resilience in cognitive domains (i.e., object placement and recognition) (for review see51).”

    From Neurobiology of resilience (2012) · cites this paper as [51]

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  1. Kneavel, M., Chrisakos, S., Ferguson, D. and Luine, V. (2000). "Effect of chronic stress in calbindin-D28 knockout and wild-type mice: spatial and non-spatial memory tasks". Neuroendocrine Workshop on Estrogen, Growth Factors and Neuroplasticity. Am. Neuroendo. Soc., Toronto.
  2. Nelson, R.J. (2000) An Introduction to Behavioral Endocrinology Chapter 11, Stress, (Sinauer Associates, Sunderland, MA), pp 557 -592.

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Authors
Luine, V.
Affiliations
City University of New York (US)
Corresponding author
Luine, Victoria
Venue
Stress
Published
2002-01
Volume
5
Issue
3
Pages
205-216
ISSN
  • 1025-3890 (ISSN-L)
  • 1607-8888
OpenAlex
W2016095773
Cited by
250
References
51
Citations by year
2026: 3 · 2025: 6 · 2024: 4 · 2023: 9 · 2022: 9 · 2021: 9 · 2020: 13 · 2019: 9 · 2018: 8 · 2017: 10 · 2016: 5 · 2015: 14 · 2014: 10 · 2013: 9 · 2012: 12
FWCI
4.40
Type
journal article
Language
en
Open access
Locations
  • Stress (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Mental Health
  • National Institute of General Medical Sciences
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
sex differences, chronic stress, memory, hypothalamic-pituitary-adrenal axis, object recognition memory, spatial memory, restraint stress, monoamines, serotonin, norepinephrine, GABA, dopaminergic activity, hippocampal CA3, amygdala, frontal cortex, estradiol, estrogen replacement therapy, ovariectomy, cognitive function
MeSH terms
Animals, Chronic Disease, Female, Humans, Male, Memory, Memory Disorders, Sex Characteristics, Stress, Physiological, Rats

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