Cited by 166Stress Responses and CortisolCancer, Stress, Anesthesia, and Immune ResponseTryptophan and brain disorders

Greater inflammatory activity and blunted glucocorticoid signaling in monocytes of chronically stressed caregivers

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Miller, Gregory E., Murphy, Michael L.M., Cashman, Rosemary, Ma, Roy, Ma, Jeffrey, Arevalo, Jesusa M.G., Kobor, Michael S., Cole, Steve W.·2014·Brain Behavior and Immunity

Abstract

Chronic stress is associated with morbidity and mortality from numerous conditions, many of whose pathogenesis involves persistent inflammation. Here, we examine how chronic stress influences signaling pathways that regulate inflammation in monocytes. The sample consisted of 33 adults caring for a family member with glioblastoma and 47 controls whose lives were free of major stressors. The subjects were assessed four times over eight months. Relative to controls, caregivers' monocytes showed increased expression of genes bearing response elements for nuclear-factor kappa B, a key pro-inflammatory transcription factor. Simultaneously, caregivers showed reduced expression of genes with response elements for the glucocorticoid receptor, a transcription factor that conveys cortisol's anti-inflammatory signals to monocytes. Transcript origin analyses revealed that CD14+/CD16- cells, a population of immature monocytes, were the predominate source of inflammatory gene expression among caregivers. We considered hormonal, molecular, and functional explanations for caregivers' decreased glucocorticoid-mediated transcription. Across twelve days, the groups displayed similar diurnal cortisol profiles, suggesting that differential adrenocortical activity was not involved. Moreover, the groups' monocytes expressed similar amounts of glucocorticoid receptor protein, suggesting that differential receptor availability was not involved. In ex vivo studies, subjects' monocytes were stimulated with lipopolysaccharide, and caregivers showed greater production of the inflammatory cytokine interleukin-6 relative to controls. However, no group differences in functional glucocorticoid sensitivity were apparent; hydrocortisone was equally effective at inhibiting cytokine production in caregivers and controls. These findings may help shed light on the mechanisms through which caregiving increases vulnerability to inflammation-related diseases.

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Authors
Miller, G. E., Murphy, M. L. M., Cashman, R., Ma, R., Ma, J., Arevalo, J. M. G., Kobor, M. S., & Cole, S. W.
Affiliations
  • Northwestern University (US)
  • BC Cancer Agency (CA)
  • University of California, Los Angeles (US)
  • University of British Columbia (CA)
Corresponding author
Miller, Gregory E.
Venue
Brain Behavior and Immunity
Publisher
Elsevier BV
Published
2014-10
Volume
41
Pages
191-199
ISSN
0889-1591 (ISSN-L)
OpenAlex
W2140711005
Cited by
166
References
53
Citations by year
2026: 3 · 2025: 5 · 2024: 9 · 2023: 19 · 2022: 19 · 2021: 22 · 2020: 13 · 2019: 20 · 2018: 16 · 2017: 17 · 2016: 16 · 2015: 6 · 2014: 1
FWCI
6.55
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior and Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Canadian Institutes of Health Research (89736)
  • National Institute on Aging (R24AG037898, P30AG017265)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Medicine › Psychiatry and Mental health › Cancer, Stress, Anesthesia, and Immune Response
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
Keywords
chronic stress, caregivers, monocytes, inflammation, glucocorticoid signaling, glucocorticoid receptor, NF-κB, cortisol, CD14+CD16+ monocytes, interleukin-6, glucocorticoid sensitivity
MeSH terms
Adult, Brain Neoplasms, C-Reactive Protein, Cells, Cultured, Chronic Disease, Female, Glioblastoma, Humans, Hydrocortisone, Inflammation, Leukocytes, Lipopolysaccharides, Male, Middle Aged, Monocytes, Receptors, Glucocorticoid, Saliva, Stress, Psychological, Transcription, Genetic, Signal Transduction, Biomarkers, Caregivers, Gene Expression Profiling

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