Memory complaints and APOE-epsilon4 accelerate cognitive decline in cognitively normal elderly

Area of Science:

• Neuroscience
• Gerontology
• Genetics

Background:

• Cognitive decline in aging is a significant concern.
• Early detection of cognitive deficits is crucial for timely intervention.
• The role of subjective memory complaints and genetic factors like APOE-epsilon4 in predicting decline needs further clarification.

Purpose of the Study:

• To determine if subjective memory complaints and APOE-epsilon4 allele carriage predict future cognitive decline in cognitively intact elderly individuals.
• To evaluate the separate and combined effects of memory complaints and APOE-epsilon4 on cognitive trajectories.

Main Methods:

• 1,168 cognitively intact elderly participants (age 62-85) from the Longitudinal Aging Study Amsterdam.
• Assessment of memory complaints and APOE-epsilon4 status at baseline.
• Cognitive decline evaluated using MMSE, Auditory Verbal Learning Test, and Alphabet Coding Task over 3 and 6 years, analyzed with generalized estimating equations.

Main Results:

• 25.5% reported memory complaints; 25.3% carried APOE-epsilon4.
• Memory complaints predicted decline in most cognitive measures (except immediate recall).
• APOE-epsilon4 carriers showed greater decline in MMSE scores and information processing speed.
• Combined effect: individuals with both factors had twice the rate of cognitive decline.

Conclusions:

• Subjective memory complaints and APOE-epsilon4 allele carriage are early predictors of cognitive decline.
• Memory complaints are significant even when objective tests show no deficits.
• Elderly APOE-epsilon4 carriers with memory complaints face an additional risk, underscoring the need for early monitoring.