Cited by 78Stress Responses and CortisolAnimal Behavior and Welfare StudiesNeuroscience and Neuropharmacology Research

Social isolation in rats: effects on animal welfare and molecular markers for neuroplasticity

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Begni, Veronica, Sanson, Alice, Pfeiffer, Natascha, Brandwein, Christiane, Inta, Dragos, Talbot, Steven R., Riva, Marco Andrea, Gass, Peter +1 more·2020·PLOS ONE

Abstract

Early life stress compromises brain development and can contribute to the development of mental illnesses. A common animal model used to study different facets of psychiatric disorders is social isolation from early life on. In rats, this isolation can induce long-lasting alterations in molecular expression and in behavior. Since social isolation models severe psychiatric symptoms, it is to be expected that it affects the overall wellbeing of the animals. As also promoted by the 3Rs principle, though, it is pivotal to decrease the burden of laboratory animals by limiting the number of subjects (reduce, replace) and by improving the animals' wellbeing (refine). The aim of this study was therefore to test possible refinement strategies such as resocialization and mere adult social isolation. We examined whether the alternatives still triggered the necessary phenotype while minimizing the stress load on the animals. Interestingly, we did not find reduced wellbeing-associated burrowing performance in isolated rats. The hyperactive phenotype seen in socially isolated animals was observed for rats undergoing the adult-only isolation, but resocializing ameliorated the locomotor abnormality. Isolation strongly affected markers of neuroplasticity in the prefrontal cortex independent of timing: mRNA levels of Arc, Bdnf and the pool of Bdnf transcripts with the 3' long UTR were reduced in all groups. Bdnf splice variant IV expression was reduced in lifelong-isolated animals. Some of these deficits normalized after resocialization; likewise, exon VI Bdnf mRNA levels were reduced only in animals persistently isolated. Conversely, social deprivation did not affect the expression of Gad67 and Pvb, two GABAergic markers, whereas changes occurred in the expression of dopamine d1 and d2 receptors. As adult isolation was sufficient to trigger the hyperactive phenotype and impaired neuroplasticity in the prefrontal cortex, it could be a candidate for a refinement strategy for certain research questions. To fully grade the severity of post-weaning social isolation and the alternatives, adult isolation and resocialization, a more profound and multimodal assessment approach is necessary.

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  • Isolation prevents all social interaction-both play and non-play-so it is unclear whether identified impairments are due to lack of play vs. lack of general social interaction, as well as additional stress that total isolation induces.

    “First, isolation prevents all social interaction—both play and non-play—so it is unclear in most of these studies whether and to what extent any identified impairments are due to the lack of play vs. the lack of general social interaction, as well as the additional stress that total isolation induces (Begni et al., 2020).”

    From Social play experience in juvenile rats is indispensable for appropriate socio-sexual behavior in adulthood in males but not females (2023) · cites this paper as Begni et al., 2020

    The Discussion reports that deprivation of social contacts impairs neuroplasticity in rats, supporting the claim that isolation removes social contact and can produce impairments. The paper does not distinguish lack of play from lack of other social interaction as causes of those impairments. It also does not establish that total isolation adds stress in these animals; the Discussion reports no altered wellbeing from isolation housing itself and describes resocialization as a temporary stressor. The indexed passages have section labels but no page numbers. (LLM, conf=0.83)

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Authors
Begni, V., Sanson, A., Pfeiffer, N., Brandwein, C., Inta, D., Talbot, S. R., Riva, M. A., Gass, P., & Mallien, A. S.
Affiliations
  • University of Milan (IT)
  • Heidelberg University (DE)
  • Medizinische Hochschule Hannover (DE)
Corresponding author
Gass, Peter
Venue
PLOS ONE
Published
2020-10-27
Volume
15
Issue
10
Pages
e0240439
ISSN
1932-6203 (ISSN-L)
OpenAlex
W3096417670
Cited by
78
References
14
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journal article
Language
en
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  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Archivio Istituzionale della Ricerca (Universita Degli Studi Di Milano) (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • DFG (Forschergruppe 2591, P05)
  • Italian Ministry of University and Research (PRIN 2017AY8BP4, PON "Ricerca e Innovazione" PerMedNet project ARS01_01226)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Veterinary › Small Animals › Animal Behavior and Welfare Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
social isolation, early life stress, animal welfare, 3Rs, resocialization, hyperactivity, neuroplasticity, prefrontal cortex, Arc, dopamine receptors, burrowing behavior
MeSH terms
Animals, Animal Welfare, Behavior, Animal, Brain, Cytoskeletal Proteins, Genetic Markers, Glutamate Decarboxylase, Nerve Tissue Proteins, Neuronal Plasticity, Phenotype, Social Isolation, Stress, Psychological, Brain-Derived Neurotrophic Factor, Rats

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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