Different susceptibility to social defeat stress of BalbC and C57BL6/J mice

Maria Razzoli, Lucia Carboni, Michela Andreoli, Alice Ballottari, Roberto Arban

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

Social stress may precipitate psychopathological disorders in susceptible individuals. The present experiments were focused on the biology beyond the differential susceptibility to social stress. Social defeat, an ethologically relevant stressor known to elicit different coping strategies, was used in two mouse strains differing for baseline emotionality, such as C57BL6/J and BalbC. In separate experiments, in both strains a single social defeat decreased home-cage activity without altering social aversion; it diminished body weight only in defeated BalbC mice. In longitudinal experiments, mice experienced repeated social defeats that induced multiple long-term consequences. Defeated C57BL6/J increased their body weight and food intake; defeated BalbC mice diminished their metabolic efficiency. Only defeated BalbC subjects exhibited increased social avoidance levels; no differences from controls were seen on forced swim test response in defeated mice of either strain. No long-term effects of social defeat were detected in peripheral biomarkers of stress, metabolic, and immune responses, although the analysis of selected internal organs revealed decreases in abdominal fat and gonadal organs in all defeated subjects. These results demonstrated a strain-distinctive profile in the susceptibility to social defeat stress, either acutely or chronically, with metabolic consequences more consistently found in C57BL6/J while social aversion induced predominantly in BalbC subjects.

Original languageEnglish (US)
Pages (from-to)100-108
Number of pages9
JournalBehavioural Brain Research
Volume216
Issue number1
DOIs
StatePublished - Jan 1 2011

Keywords

  • Biomarkers
  • Hormones
  • Inflammation
  • Metabolism
  • Social defeat
  • Strain
  • Stress
  • Vulnerability

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