{
  "id": 3769395,
  "title": "CSF complement proteins are associated with early tau pathology and synaptic damage in an asymptomatic population at risk of Alzheimer's disease",
  "url": "https://urgent.news/2026/08/27/csf-complement-proteins-are-associated-with-early-tau-pathology-and",
  "topic": "health",
  "section": "Health & Medicine",
  "published": "2026-08-27T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.24.742564v1?rss=1"
  },
  "original_language": "en",
  "account": "The PREVENT-AD study examined CSF complement proteins in relation to early Alzheimer's disease (AD) pathology and synaptic dysfunction in cognitively unimpaired individuals at increased familial risk of AD. Researchers measured baseline CSF levels of C1q, C3, C3b, and Factor H, and correlated these measurements with CSF AD biomarkers, synaptic proteins, cognition, MRI volumetry, and amyloid and tau PET. In PREVENT-AD participants, C1q and Factor H demonstrated strong positive associations with P-tau181, T-tau, and various synaptic markers. Conversely, C3 displayed minimal associations, while C3b exhibited weaker positive relationships with P-tau181, T-tau, ADAM22, and ADAM23. Across the broader ADNI cohort, C1q remained the most consistent analyte, linking to tau, neurofilament light, and synaptic markers in all diagnostic groups. C3 predominantly showed negative associations, while C3b and Factor H displayed stage-dependent relationships, particularly in symptomatic individuals with evident neurodegeneration and synaptic injury. These findings suggest that complement dysregulation, particularly involving C1q, may be an early correlate of tau-linked synaptic pathology, supporting a role for complement activation in the AD molecular cascade.",
  "summary": "Complement-mediated neuroinflammation has been implicated in Alzheimer's disease (AD), but its role during the pre-symptomatic phase of the disease remains unclear. In the PREVENT-AD cohort of cognitively unimpaired individuals at increased familial risk of AD, we investigated whether CSF complement proteins relate to early AD pathology and synaptic dysfunction, then assessed our results'…",
  "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."
}