{
  "id": 3028727,
  "title": "A proteomic feasibility study connecting metabolic and synaptic pathway alterations in serum and extracellular vesicles to characterize treatment-resistant depression",
  "url": "https://urgent.news/2026/08/24/a-proteomic-feasibility-study-connecting-metabolic-and-synaptic",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-24T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.19.745678v1?rss=1"
  },
  "original_language": "en",
  "account": "Treatment-resistant depression (TRD) remains a daunting clinical challenge, with the biological processes differentiating TRD from non-treatment-resistant depression (nTRD) still poorly understood. While serum proteomes, found in the blood, can reflect broad systemic changes linked to depression, extracellular vesicles (EVs) may offer a more targeted view of intercellular signaling relevant to treatment resistance. This pilot study aimed to determine if parallel proteomic analysis of serum and EVs could differentiate healthy controls (CON), nTRD, and TRD individuals.\n\nThe findings revealed that serum proteomes displayed significant global differences between the depression groups and controls, largely stemming from shared systemic biology in nTRD and TRD. However, EV proteomes exhibited limited global separation but unveiled subtype-associated pathway variations. Compared to controls, nTRD EVs showed enrichment in immune and inflammatory pathways. Conversely, TRD EVs were characterized by enrichment in mitochondrial metabolism, oxidative phosphorylation, translational initiation, and MYC-regulated pathways, alongside a depletion of synaptic signaling, membrane trafficking, and cytoskeletal pathways.\n\nWhen comparing the pathways significant in both contrasts, it was discovered that these bioenergetic and translational signatures were selectively amplified in TRD relative to nTRD. The study's exploratory analysis suggested that the circulating EV cargo might reflect a treatment-resistant-specific reorganization of biological pathways, which is not evident in bulk serum proteomics. This research underscores the potential of parallel serum and EV proteomics as a complementary method for molecular stratification in the diagnosis of antidepressant resistance.",
  "summary": "Treatment-resistant depression (TRD) remains a major clinical challenge, yet the biological processes distinguishing TRD from non-treatment-resistant depression (nTRD) are incompletely defined. While circulating serum proteomes reflect broad systemic alterations associated with depression, extracellular vesicles (EVs) could provide a more selective representation of intercellular signaling…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}