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Summary
This summary is machine-generated.

Higher levels of synaptic proteins neuropentraxin 2 (NPTX2), GluA4, and VGF in cerebrospinal fluid are linked to better white matter integrity and cognitive function in older adults, suggesting a role in cognitive resilience.

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Area of Science:

  • Neuroscience
  • Biomarkers
  • Cognitive Aging

Background:

  • Cerebrospinal fluid (CSF) levels of synaptic proteins neuropentraxin 2 (NPTX2) and neurosecretory protein VGF are associated with reduced cognitive decline.
  • Mechanisms linking these synaptic proteins to cognitive benefits remain unclear.
  • This study investigated the relationship between CSF synaptic protein levels (NPTX2, VGF, GluA4) and white matter microstructure, considering Alzheimer's disease (AD) biomarker influence.

Purpose of the Study:

  • To examine the cross-sectional association between CSF levels of NPTX2, VGF, and GluA4 with white matter microstructure.
  • To determine if CSF AD biomarker levels modify the relationship between synaptic proteins and white matter microstructure.
  • To explore the link between synaptic proteins, white matter integrity, and cognitive performance.

Main Methods:

  • 126 cognitively unimpaired middle-aged and older adults from the BIOCARD study provided CSF and MRI data.
  • Synaptic proteins were quantified in CSF using mass spectrometry; AD biomarkers were measured via electrochemiluminescence.
  • White matter microstructure was assessed using diffusion tensor imaging (DTI) fractional anisotropy (FA) and mean diffusion (MD) in global cortical, medial temporal, and cerebellar tracts.

Main Results:

  • Higher CSF levels of NPTX2, VGF, and GluA4 were associated with better white matter microstructure (higher FA, lower MD) across all assessed regions.
  • These associations remained consistent after including CSF AD biomarkers, with no significant interactions observed.
  • Improved white matter microstructure in cortical and cerebellar tracts correlated with better executive function and visuospatial performance.

Conclusions:

  • Elevated CSF levels of NPTX2, GluA4, and VGF correlate with superior white matter integrity and cognitive function.
  • These synaptic proteins may promote cognitive resilience in older adults, potentially through enhanced white matter microstructure.
  • Longitudinal research is warranted to confirm the impact of these proteins on white matter and cognition over time.