s41398-021-01506-4.pdf (1.56 MB)
No evidence for differential gene expression in major depressive disorder PBMCs, but robust evidence of elevated biological ageing
journal contribution
posted on 2023-06-10, 02:19 authored by John J Cole, Alison McColl, Robin Shaw, Mary-Ellen Lynall, Philip J Cowen, Peter de Boer, Wayne C Drevets, Neil Harrison, Carmine Pariante, Linda Pointon, NIMA consortium, Carl Goodyear, Edward Bullmore, Jonathan CavanaghThe increasingly compelling data supporting the involvement of immunobiological mechanisms in Major Depressive Disorder (MDD) might provide some explanation forthe variance in this heterogeneous condition. Peripheral blood measures of cytokines and chemokines constitute the bulk of evidence, with consistent meta-analytic data implicating raised proinflammatory cytokines such as IL6, IL1ß and TNF. Among the potential mechanisms linking immunobiological changes to affective neurobiology is the accelerated biological ageing seen in MDD, particularly via the senescence associated secretory phenotype (SASP). However, the cellular source of immunobiological markers remains unclear. Pre-clinical evidence suggests a role for peripheral blood mononuclear cells (PBMC), thus here we aimed to explore the transcriptomic profile using RNA sequencing in PBMCs in a clinical sample of people with various levels of depression and treatment response comparing it with that in healthy controls (HCs). There were three groups with major depressive disorder (MDD): treatment-resistant (n = 94), treatment-responsive (n = 47) and untreated (n = 46). Healthy controls numbered 44. Using PBMCs gene expression analysis was conducted using RNAseq to a depth of 54.5 million reads. Differential gene expression analysis was performed using DESeq2. The data showed no robust signal differentiating MDD and HCs. There was, however, significant evidence of elevated biological ageing in MDD vs HC. Biological ageing was evident in these data as a transcriptional signature of 888 age-associated genes (adjusted p < 0.05, absolute log2fold > 0.6) that also correlated strongly with chronological age (spearman correlation coefficient of 0.72). Future work should expand clinical sample sizes and reduce clinical heterogeneity. Exploration of RNA-seq signatures in other leukocyte populations and single cell RNA sequencing may help uncover more subtle differences. However, currently the subtlety of any PBMC signature mitigates against its convincing use as a diagnostic or predictive biomarker.
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Publication status
- Published
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- Published version
Journal
Translational PsychiatryISSN
2158-3188Publisher
Springer NatureExternal DOI
Issue
1Volume
11Page range
1-11Article number
a404Event location
United StatesDepartment affiliated with
- BSMS Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2022-01-17First Open Access (FOA) Date
2022-01-17First Compliant Deposit (FCD) Date
2022-01-17Usage metrics
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