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Early menopause exacerbates Alzheimer's disease risk in women. Reduced synaptic integrity combined with earlier menopause is linked to increased tau pathology and faster cognitive decline.

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Gerontology

Background:

  • Early menopause is a risk factor for Alzheimer's disease (AD) in women.
  • Synaptic dysfunction is a key factor in AD progression.
  • The interplay between menopausal age and synaptic health in AD is not fully understood.

Purpose of the Study:

  • To investigate the synergistic effects of age at menopause and synaptic integrity on AD neuropathology and cognitive decline in women.
  • To examine how synaptic biomarkers interact with menopausal age to influence tau and beta-amyloid accumulation.
  • To determine the association between menopausal age, synaptic integrity, and cognitive trajectories.

Main Methods:

  • Utilized autopsy and clinical data from the Rush Memory and Aging Project.
  • Measured presynaptic proteins (complexin-I, complexin-II, SNARE interactions) in cortical regions.
  • Quantified beta-amyloid and tau pathology via immunohistochemistry and assessed global cognition annually.
  • Employed linear and mixed effects models to test interactive effects, adjusting for covariates.

Main Results:

  • Earlier menopause exacerbated the association between reduced synaptic integrity and increased tau pathology.
  • No interaction was found between menopausal age and synaptic biomarkers on beta-amyloid accumulation.
  • Earlier menopause amplified the negative impact of reduced synaptic integrity on cognitive decline.
  • Hormone therapy appeared to attenuate these interactive effects on tau and cognition.

Conclusions:

  • Reduced synaptic integrity in the context of early menopause is associated with greater tau burden and accelerated cognitive decline.
  • Midlife endocrine changes may modify the relationship between late-life synaptic integrity and brain health.
  • Targeting both menopausal factors and synaptic integrity may enhance resilience to AD in women.