Psychosocial experiences are associated with human brain mitochondrial biology.
Level 3 - non-randomized controlled study
Observational cohort study linking antemortem longitudinal psychological data to postmortem human brain tissue proteomics and transcriptomics.
PubMed 38889126 · doi:10.1073/pnas.2317673121
What was done
Researchers paired longitudinal antemortem self-reported psychosocial assessments (positive well-being and negative mood states) with postmortem dorsolateral prefrontal cortex tissue analyses in older adults. They quantified mitochondrial oxidative phosphorylation (OxPhos) proteins via proteomics and evaluated cell-type-specific gene expression using single-nucleus RNA sequencing (snRNA-seq) alongside bulk RNA-seq.
What was found
Higher well-being correlated with greater abundance of mitochondrial OxPhos machinery, whereas higher negative mood correlated with lower OxPhos protein content. Positive and negative psychosocial factors combined explained 18% to 25% of the variance in the abundance of OxPhos complex I. snRNA-seq showed cell-type-specific divergence: positive psychosocial experiences were positively associated with mitochondrial expression profiles in glial cells but negatively associated in neurons, a contrast that masked associations in bulk RNA sequencing.
Why it matters
This study provides direct molecular evidence in human brain tissue connecting subjective psychological experiences to mitochondrial bioenergetics at single-cell resolution. It highlights that psychological states correlate with distinct, cell-type-specific bioenergetic signatures in the prefrontal cortex.
Limits
The abstract does not disclose the sample size, demographic breakdown, or postmortem interval intervals. Because tissue analysis is postmortem and correlational, it cannot establish whether mitochondrial variations are causes, consequences, or co-occurring markers of psychosocial states. Findings are restricted to the dorsolateral prefrontal cortex and rely on subjective, self-reported antemortem measures.