Cited by 60Stress Responses and CortisolAnimal Behavior and Welfare StudiesMemory and Neural Mechanisms

Moderate neonatal stress decreases within-group variation in behavioral, immune and HPA responses in adult mice

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Macrì, Simone, Pasquali, Paolo, Bonsignore, Luca Tommaso, Pieretti, Stefano, Cirulli, Francesca, Chiarotti, Flavia, Laviola, Giovanni·2007·PLoS ONE

Abstract

BACKGROUND: The significance of behavioral neuroscience and the validity of its animal models of human pathology largely depend on the possibility to replicate a given finding across different laboratories. Under the present test and housing conditions, this axiom fails to resist the challenge of experimental validation. When several mouse strains are tested on highly standardized behavioral test batteries in different laboratories, significant strain x lab interactions are often detected. This limitation, predominantly due to elevated within-group variability observed in control subjects, increases the number of animals needed to address fine experimental questions. Laboratory rodents display abnormal stress and fear reactions to experimental testing, which might depend on the discrepancy between the stability of the neonatal environment and the challenging nature of the adult test and housing conditions. METHODOLOGY/PRINCIPAL FINDINGS: Stimulating neonatal environments (e.g. brief maternal separations, increased foraging demands or maternal corticosterone supplementation) reduce stress and fear responses in adulthood. Here we tested whether reduced fearfulness associated with experimental testing would also reduce inter-individual variation. In line with our predictions, we show that a moderate elevation in neonatal corticosterone through maternal milk significantly reduces fear responses and inter-individual variability (average 44%) in adult mouse offspring. CONCLUSIONS/SIGNIFICANCE: We observed reduced variation in pain perception, novelty preference, hormonal stress response and resistance to pathogen infection. This suggests that the results of this study may apply to a relatively broad spectrum of neuro-behavioral domains. Present findings encourage a reconsideration of the basic principles of neonatal housing systems to improve the validity of experimental models and reduce the number of animals used.

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Authors
Macrì, S., Pasquali, P., Bonsignore, L. T., Pieretti, S., Cirulli, F., Chiarotti, F., & Laviola, G.
Affiliations
Istituto Superiore di Sanità (IT)
Venue
PLoS ONE
Published
2007-10-10
Volume
2
Issue
10
Pages
e1015
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1999466466
Cited by
60
References
44
Citations by year
2026: 1 · 2023: 1 · 2021: 3 · 2020: 2 · 2019: 2 · 2018: 2 · 2017: 2 · 2016: 6 · 2015: 5 · 2014: 1 · 2013: 5 · 2012: 5
FWCI
2.47
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Alliance for Research on Schizophrenia and Depression
  • National Institutes of Health
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Veterinary › Small Animals › Animal Behavior and Welfare Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
neonatal stress, maternal corticosterone, interindividual variability, fear response, hypothalamic-pituitary-adrenal axis, immune response, novelty preference, pain perception, maternal separation, breast milk, animal model validity
MeSH terms
Adrenal Cortex Hormones, Animals, Animals, Newborn, Behavior, Animal, Female, Hypothalamo-Hypophyseal System, Immune System, Male, Pain, Pituitary-Adrenal System, Pregnancy, Research Design, Species Specificity, Genetic Variation, Mice

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