Clinical Manifestations

Area of Science:

• Neuroscience
• Neurology
• Gerontology

Background:

• High cognitive reserve (CR) is associated with reduced dementia risk and better cognitive function despite Alzheimer's disease (AD) pathology.
• The U.S. Study to Protect Brain Health through Lifestyle Intervention to Reduce Risk (U.S.POINTER) Trial investigated lifestyle interventions for brain health.

Purpose of the Study:

• To test the hypothesis that cognitive reserve (CR) is associated with baseline amyloid and tau pathology in the U.S.POINTER Trial cohort.
• To examine the relationship between educational attainment (as a measure of CR) and the presence of amyloid plaques and tau tangles in the brain.

Main Methods:

• Analyzed data from 911 cognitively unimpaired participants (60-79 years old) in the U.S.POINTER imaging ancillary study.
• Used positron emission tomography (PET) to measure amyloid and tau burden.
• Employed logistic and linear regression models to assess the association between CR (educational level) and AD pathology, adjusting for various demographic, genetic, and health factors.

Main Results:

• Higher CR (college graduates and advanced degrees vs. high school graduates) was significantly associated with lower tau accumulation in the entorhinal cortex (ERC).
• Age, race/ethnicity, APOE e4 genotype, and maternal history of dementia predicted amyloid positivity.
• Educational level was not significantly associated with amyloid positivity or tau levels in the meta-region of interest (meta-ROI).

Conclusions:

• Higher cognitive reserve is associated with reduced tau burden in the entorhinal cortex, an area critical in early AD tau deposition.
• Findings suggest a potential role for CR in providing biological resistance against the development of AD pathology.
• Tau levels in the meta-ROI may have been too low in this sample of cognitively unimpaired individuals to detect significant associations.