Science Briefing

Key Highlights

Medicine · Neurology · Alzheimer’s Disease

This cross-sectional study investigated the relationship between circulating sphingomyelins (SMs) and plasma total tau (T-tau) in cognitively unimpaired older adults with and without cortical amyloid-β pathology. Researchers found significant positive correlations between SMs and T-tau exclusively in amyloid-positive individuals, alongside inverse associations between SMs and cortical amyloid burden and cognitive performance. The findings suggest that altered SM metabolism may reflect an early neuroprotective lipid response tied to tau-related neurodegeneration, positioning circulating SMs as promising early biomarkers for preclinical Alzheimer’s disease.

Novelty: 78%

Rigor: 82%

Significance: 85%

Validity: 80%

Clarity: 88%

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