Cited by 39Stress Responses and CortisolMemory and Neural MechanismsNeuropeptides and Animal Physiology

Individual differences in the effects of chronic stress on memory: behavioral and neurochemical correlates of resiliency

Sweis, B.M., Veverka, K.K., Dhillon, E.S., Urban, J.H., Lucas, L.R.·2013·Neuroscience

Abstract

Chronic stress has been shown to impair memory, however, the extent to which memory can be impaired is often variable across individuals. Predisposed differences in particular traits, such as anxiety, may reveal underlying neurobiological mechanisms that could be driving individual differences in sensitivity to stress and, thus, stress resiliency. Such pre-morbid characteristics may serve as early indicators of susceptibility to stress. Neuropeptide Y (NPY) and enkephalin (ENK) are neurochemical messengers of interest implicated in modulating anxiety and motivation circuitry; however, little is known about how these neuropeptides interact with stress resiliency and memory. In this experiment, adult male rats were appetitively trained to locate sugar rewards in a motivation-based spatial memory task before undergoing repeated immobilization stress and then being tested for memory retention. Anxiety-related behaviors, among other characteristics, were monitored longitudinally. Results indicated that stressed animals which showed little to no impairments in memory post-stress (i.e., the more stress-resilient individuals) exhibited lower anxiety levels prior to stress when compared to stressed animals that showed large deficits in memory (i.e., the more stress-susceptible individuals). Interestingly, all stressed animals, regardless of memory change, showed reduced body weight gain as well as thymic involution, suggesting that the effects of stress on metabolism and the immune system were dissociated from the effects of stress on higher cognition, and that stress resiliency seems to be domain-specific rather than a global characteristic within an individual. Neurochemical analyses revealed that NPY in the hypothalamus and amygdala and ENK in the nucleus accumbens were modulated differentially between stress-resilient and stress-susceptible individuals, with elevated expression of these neuropeptides fostering anxiolytic and pro-motivation function, thus driving cognitive resiliency in a domain-specific manner. Findings suggest that such neurochemical markers may be novel targets for pharmacological interventions that can serve to prevent or ameliorate the negative effects of stress on memory.

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Crossref · 10.1016/j.neuroscience.2013.04.052

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  • Chronic stress is associated with cognitive deficits, systemic inflammation, premature aging, immune system dysfunction, and a higher likelihood of metabolic disorders such as diabetes, cardiovascular disease, and IBD.

    “Chronic stress is associated with various cognitive deficits, systemic inflammation, premature aging, immune system dysfunction, and a higher likelihood of suffering from metabolic disorders such as diabetes, cardiovascular disease, and IBD (490–492).”

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Authors
Sweis, B. M., Veverka, K. K., Dhillon, E. S., Urban, J. H., & Lucas, L. R.
Affiliations
  • University of Minnesota (US)
  • Loyola University Chicago (US)
  • Rosalind Franklin University of Medicine and Science (US)
Corresponding author
Lucas, L.R.
Venue
Neuroscience
Publisher
Elsevier BV
Published
2013-08
Volume
246
Pages
142-159
ISSN
0306-4522 (ISSN-L)
OpenAlex
W1981304687
Cited by
39
References
67
Citations by year
2025: 1 · 2024: 2 · 2023: 3 · 2022: 2 · 2021: 1 · 2020: 5 · 2019: 2 · 2018: 3 · 2017: 5 · 2015: 5 · 2014: 8 · 2013: 2
FWCI
2.28
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (T32GM008471)
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 › Neuropeptides and Animal Physiology
Keywords
chronic stress, stress resilience, memory impairment, individual differences, anxiety, neuropeptide Y, enkephalin, restraint stress, spatial memory, hypothalamus, amygdala, nucleus accumbens, thymic involution, weight gain, motivation, neurochemical markers, stress vulnerability
MeSH terms
Amygdala, Animals, Chronic Disease, Enkephalins, Hippocampus, Hypothalamus, Individuality, Male, Memory, Motivation, Neuropeptide Y, RNA, Messenger, Stress, Psychological, Rats, Sprague-Dawley, Rats, Resilience, Psychological

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