Loneliness and stress-related inflammatory and neuroendocrine responses in older men and women

Ruth A. Hackett*, Mark Hamer, Romano Endrighi, Lena Brydon, Andrew Steptoe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

179 Citations (Scopus)

Abstract

Loneliness is a predictor of mortality and increased cardiovascular morbidity. Inflammation is a potential pathway through which loneliness might impact health. The aim of the study was to investigate the relationship between loneliness and inflammatory interleukin-6 (IL-6), interleukin-1 receptor antagonist (IL-1Ra) and monocyte chemotactic protein-1 (MCP-1) responses to standardized mental stress. A secondary purpose was to evaluate whether individual variations in cortisol responses influenced the hypothesised relationship between loneliness and inflammation. Saliva samples and blood were taken from 524 healthy middle-aged men and women from the Whitehall II cohort at baseline, immediately after the stress tasks and 45. min later. Loneliness was measured using the revised UCLA loneliness scale. Greater loneliness was associated with larger IL-6 (p= 0.044) and IL-1Ra (p= 0.006) responses to psychological stress and higher MCP-1 (p< 0.001) levels in women, independently of age, grade of employment, body mass index and smoking status. No associations were observed in men. Cortisol responsivity was inversely related to loneliness in women, with the odds of being a cortisol responder decreasing with increased loneliness independently of covariates (p= 0.008). The impact of loneliness on health in women may be mediated in part through dysregulation of inflammatory and neuroendocrine systems.

Original languageEnglish
Pages (from-to)1801-1809
Number of pages9
JournalPsychoneuroendocrinology
Volume37
Issue number11
DOIs
Publication statusPublished - 1 Nov 2012

Keywords

  • Cytokines
  • Interleukin-1 receptor antagonist
  • Interleukin-6
  • Loneliness
  • Mental stress
  • Monocyte chemotactic protein 1
  • Salivary cortisol

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