BACKGROUND: Functional magnetic resonance imaging plays a promising role in the preclinical characterization of Alzheimer disease (AD) for use in early diagnosis and in preventive drug trials. OBJECTIVE: To determine whether functional magnetic resonance imaging can reliably distinguish risk groups for AD among cognitively normal middle-aged adults. DESIGN: Cross-sectional case-control study. SETTING: University of California, San Diego, Alzheimer Disease Research Center participants and San Diego community volunteers. PARTICIPANTS: Twenty cognitively normal individuals (10 high risk and 10 low risk), aged 58 to 65 years, were divided into 2 groups based on the presence or absence of the apolipoprotein E epsilon4 allele and a positive family history of AD. MAIN OUTCOME MEASURES: Word pairs were presented in a blocked design alternating between conditions of novel pairs, repeated pairs, and fixation. Whole-brain differences in blood oxygenation level-dependent brain responses between conditions were compared across risk groups. RESULTS: Compared with the low-risk group, the high-risk group showed many areas of differential blood oxygenation level-dependent response in regions commonly associated with AD pathology (eg, the left medial temporal lobe). Furthermore, different patterns of association between left medial temporal lobe activity and memory performance were demonstrated. CONCLUSIONS: Results support a theory of up-regulation in neuronal memory systems in people at risk for AD many years before the typical age at disease onset. They further demonstrate that functional magnetic resonance imaging is a viable technique to identify persons at risk for AD.
BACKGROUND: Functional magnetic resonance imaging plays a promising role in the preclinical characterization of Alzheimer disease (AD) for use in early diagnosis and in preventive drug trials. OBJECTIVE: To determine whether functional magnetic resonance imaging can reliably distinguish risk groups for AD among cognitively normal middle-aged adults. DESIGN: Cross-sectional case-control study. SETTING: University of California, San Diego, Alzheimer Disease Research Center participants and San Diego community volunteers. PARTICIPANTS: Twenty cognitively normal individuals (10 high risk and 10 low risk), aged 58 to 65 years, were divided into 2 groups based on the presence or absence of the apolipoprotein E epsilon4 allele and a positive family history of AD. MAIN OUTCOME MEASURES: Word pairs were presented in a blocked design alternating between conditions of novel pairs, repeated pairs, and fixation. Whole-brain differences in blood oxygenation level-dependent brain responses between conditions were compared across risk groups. RESULTS: Compared with the low-risk group, the high-risk group showed many areas of differential blood oxygenation level-dependent response in regions commonly associated with AD pathology (eg, the left medial temporal lobe). Furthermore, different patterns of association between left medial temporal lobe activity and memory performance were demonstrated. CONCLUSIONS: Results support a theory of up-regulation in neuronal memory systems in people at risk for AD many years before the typical age at disease onset. They further demonstrate that functional magnetic resonance imaging is a viable technique to identify persons at risk for AD.
Authors: John M Ringman; Luis D Medina; Meredith Braskie; Yaneth Rodriguez-Agudelo; Daniel H Geschwind; Miguel A Macias-Islas; Jeffrey L Cummings; Susan Bookheimer Journal: Cereb Cortex Date: 2010-08-20 Impact factor: 5.357
Authors: S Duke Han; Wes S Houston; Amy J Jak; Lisa T Eyler; Bonnie J Nagel; Adam S Fleisher; Gregory G Brown; Jody Corey-Bloom; David P Salmon; Leon J Thal; Mark W Bondi Journal: Neurobiol Aging Date: 2006-01-24 Impact factor: 4.673
Authors: Nicola Filippini; Bradley J MacIntosh; Morgan G Hough; Guy M Goodwin; Giovanni B Frisoni; Stephen M Smith; Paul M Matthews; Christian F Beckmann; Clare E Mackay Journal: Proc Natl Acad Sci U S A Date: 2009-04-08 Impact factor: 11.205
Authors: Nanthia A Suthana; Allison Krupa; Markus Donix; Alison Burggren; Arne D Ekstrom; Michael Jones; Linda M Ercoli; Karen J Miller; Prabha Siddarth; Gary W Small; Susan Y Bookheimer Journal: Neuroimage Date: 2009-12-18 Impact factor: 6.556