Myeloid differentiation architecture of leukocyte transcriptome dynamics in perceived social isolation.
Level 3 - non-randomized controlled study
Longitudinal cohort study in humans combined with an animal mechanistic model
PubMed 26598672 · doi:10.1073/pnas.1514249112
What was done
Integrative analyses of leukocyte gene regulation were conducted across five longitudinal leukocyte transcriptome surveys in 141 older adults experiencing perceived social isolation (loneliness). Parallel mechanistic experiments were conducted in a rhesus macaque model of perceived social isolation evaluating immune responses and response to simian immunodeficiency virus (SIV) infection.
What was found
In 141 older adults, perceived social isolation was associated with up-regulation of sympathetic nervous system (SNS) signaling, expansion of the monocyte population, and up-regulation of the leukocyte conserved transcriptional response to adversity (CTRA). In the macaque model, perceived social isolation confirmed CTRA activation, demonstrated selective up-regulation of the CD14(++)/CD16(-) classical monocyte transcriptome, functional glucocorticoid desensitization, down-regulation of Type I and Type II interferons, and impaired immune response to SIV infection. Specific numerical effect estimates and variance metrics were not provided in the abstract.
Why it matters
The study outlines a cellular pathway connecting social adversity to physical illness, demonstrating that loneliness skews myeloid differentiation toward a pro-inflammatory, antiviral-deficient phenotype via neuroendocrine signaling.
Limits
The human component is observational and limited to older adults, precluding independent establishment of causality in humans. Exact statistical metrics, effect magnitudes, and the number of macaques used were not reported in the abstract.
Cited by
- supports Research by Steve Cole shows that social disconnection and loneliness activate a pattern of gene expression that drives inflammation.