Differential effects of the APOE genotype on brain function across the lifespan
| Autor: | Paul M. Matthews, Steve M. Smith, Bradley J. MacIntosh, Nicola Filippini, Christian F. Beckmann, Aaron J. Trachtenberg, Clare E. Mackay, Giovanni B. Frisoni, Gordon K. Wilcock, Klaus P. Ebmeier |
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| Rok vydání: | 2010 |
| Předmět: |
Apolipoprotein E
Male Genotype Cognitive Neuroscience Apolipoprotein E4 Physiology Grey matter Neuropsychological Tests Apolipoproteins E Cognition Life Expectancy Neuroimaging Alzheimer Disease Memory Reference Values Risk Factors medicine Reaction Time Memory impairment Humans Cognitive decline Aged Brain Middle Aged Magnetic Resonance Imaging medicine.anatomical_structure Neurology Cerebral blood flow Cerebrovascular Circulation Carrier State Female Age of onset Psychology Cognition Disorders Neuroscience |
| Zdroj: | NeuroImage. 54(1) |
| ISSN: | 1095-9572 |
| Popis: | Increasing age and carrying an APOE e4 allele are well established risk factors for Alzheimer's disease (AD). The earlier age of onset of AD observed in e4-carriers may reflect an accelerated aging process. We recently reported that APOE genotype modulates brain function decades before the appearance of any cognitive or clinical symptoms. Here we test the hypothesis that APOE influences brain aging by comparing healthy e4-carriers and non-carriers, using the same imaging protocol in distinct groups of younger and older healthy volunteers. A cross-sectional factorial design was used to examine the effects of age and APOE genotype, and their interaction, on fMRI activation during an encoding memory task. The younger (N=36; age range 20-35; 18 e4-carriers) and older (35 middle-age/elderly; age range 50-78 years; 15 e4-carriers) healthy volunteers taking part in the study were cognitively normal. We found a significant interaction between age and e4-status in the hippocampi, frontal pole, subcortical nuclei, middle temporal gyri and cerebellum, such that aging was associated with decreased activity in e4-carriers and increased activity in non-carriers. Reduced cerebral blood flow was found in the older e4-carriers relative to older non-carriers despite preserved grey matter volume. Overactivity of brain function in young e4-carriers is disproportionately reduced with advancing age even before the onset of measurable memory impairment. The APOE genotype determines age-related changes in brain function that may reflect the increased vulnerability of e4-carriers to late-life pathology or cognitive decline. |
| Databáze: | OpenAIRE |
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