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Basic Science and Pathogenesis.

Alaina Durant1, Shubhabrata Mukherjee2, Michael L Lee2

  • 1Vanderbilt University Medical Center, Nashville, TN, USA.

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Summary
This summary is machine-generated.

SuperAgers, older adults with exceptional memory, show reduced Alzheimer's disease neuropathologic change and specific protein accumulations. This suggests unique biological resilience contributing to their cognitive preservation.

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Area of Science:

  • Neurology
  • Gerontology
  • Pathology

Background:

  • SuperAgers are individuals aged 80+ exhibiting cognitive function comparable to much younger adults (50s-60s).
  • Understanding the neuropathological underpinnings of SuperAgers is crucial for insights into cognitive aging and resilience.

Purpose of the Study:

  • To assess Alzheimer's disease neuropathologic change (ADNC) and other pathologies in SuperAgers.
  • Compare neuropathology in SuperAgers against Alzheimer's disease (AD) cases and age-matched controls.

Main Methods:

  • Utilized harmonized data from three national cohorts (ACT, ROSMAPMARS, NACC).
  • Analyzed cognitive scores (memory, executive function, language) and cross-sectional neuropathology.
  • Employed logistic regression to compare ADNC, TDP-43, hippocampal sclerosis, alpha-synucleinopathy, cerebrovascular disease, and cerebral amyloid angiopathy (CAA) between groups.

Main Results:

  • SuperAgers exhibited significantly less ADNC and concomitant pathologies than AD dementia cases.
  • Compared to age-matched controls, SuperAgers had lower prevalence and levels of neuritic plaques, CAA, and neocortical/medial temporal lobe TDP-43.
  • Cerebrovascular pathology (microinfarcts, lacunes, whole brain vascular disease) was similar across SuperAgers, AD cases, and controls.

Conclusions:

  • SuperAgers demonstrate reduced burden of key Alzheimer's pathologies, including neuritic plaques, CAA, and TDP-43.
  • Despite preserved memory, SuperAgers share similar levels of cerebrovascular pathology with AD cases and controls.
  • These findings highlight distinct neuropathological profiles associated with exceptional cognitive aging.