Cited by 484Stress Responses and CortisolNeuroendocrine regulation and behaviorMemory and Neural Mechanisms

Long-lasting changes in stress-induced corticosterone response and anxiety-like behaviors as a consequence of neonatal maternal separation in Long–Evans rats

Kalinichev, Mikhail, Easterling, Keith W, Plotsky, Paul M, Holtzman, Stephen G·2002·Pharmacology Biochemistry and Behavior

Abstract

Early neonatal environmental factors appear to have powerful and long-lasting influences on an organism's physiology and behavior. Long-Evans male rats separated from their dam for 3 h daily over the first 2 weeks of life (maternally separated, MS rats) when tested as adults exhibit exaggerated behavioral and neuroendocrine responses to stress compared to 15-min separated (handled, H) animals. The purpose of this study was to compare male and female adult rats that were MS, H or were undisturbed (nonhandled, NH) as neonates in anxiety-like behaviors, in the elevated plus-maze, and in response to startle-inducing auditory stimuli. We confirmed that MS males oversecrete corticosterone (CORT; 2.5-5 times) in response to mild handling stress. MS males and females were less likely to explore open arms of the plus-maze. MS males exhibited 35% higher startle amplitudes compared to controls. Furthermore, MS males were more likely to emit ultrasonic vocalizations in response to startle than were H controls. However, MS and control females did not differ in auditory startle response or in startle-induced ultrasonic vocalizations. Therefore, experiencing maternal separation results in a long-lasting increase in anxiety-like behaviors that occurs in a sex-dependent manner.

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Crossref · 10.1016/s0091-3057(02)00781-5

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  • Repeated and prolonged maternal separation in rodent pups results in exaggerated sympathetic nervous system and HPA-axis responses to stress during adolescence and adulthood.

    “Repeated and prolonged maternal separation in rodent pups results in exaggerated SNS and HPA-axis responses to stress during adolescence and adulthood (Kalinichev et al., 2002; Plotsky and Meaney, 1993).”

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Authors
Kalinichev, M., Easterling, K. W., Plotsky, P. M., & Holtzman, S. G.
Affiliations
Emory University (US)
Corresponding author
Kalinichev, Mikhail
Venue
Pharmacology Biochemistry and Behavior
Publisher
Elsevier BV
Published
2002-08
Volume
73
Issue
1
Pages
131-140
ISSN
0091-3057 (ISSN-L)
OpenAlex
W2055408622
Cited by
484
References
56
Citations by year
2026: 9 · 2025: 3 · 2024: 12 · 2023: 16 · 2022: 18 · 2021: 18 · 2020: 19 · 2019: 23 · 2018: 20 · 2017: 15 · 2016: 20 · 2015: 17 · 2014: 40 · 2013: 30 · 2012: 27
FWCI
6.88
Type
journal article
Language
en
Open access
closed
Locations
  • Pharmacology Biochemistry and Behavior (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute on Drug Abuse (K05-DA00008, DA11384, K05DA000008, R21DA011384)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
neonatal maternal separation, anxiety-like behavior, corticosterone, stress response, sex differences, ultrasonic vocalizations, startle response, elevated plus maze, Long-Evans rats, early life experience, handling stress
MeSH terms
Acoustic Stimulation, Animals, Animals, Newborn, Anxiety, Corticosterone, Female, Male, Maternal Deprivation, Pregnancy, Stress, Physiological, Time, Vocalization, Animal, Rats, Long-Evans, Rats

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