title: Beta-amyloid imaging and memory in non-demented individuals: evidence for preclinical Alzheimer's disease.
abstract: Beta-amyloid (Abeta) deposition is pathognomic for Alzheimer's disease (AD), but may occur in normal elderly people without apparent cognitive effect. Episodic memory impairment is an early and prominent sign of AD, but its relationship with Abeta burden in non-demented persons and in AD patients is unclear. We examined this relationship using 11C-PIB-PET as a quantitative marker of Abeta burden in vivo in healthy ageing (HA), mild cognitive impairment (MCI) and AD. Thirty-one AD, 33 MCI and 32 HA participants completed neuropsychological assessment and a 11C-PIB-PET brain scan. Multiple linear regression analyses were conducted relating episodic memory performance and other cognitive functions to Abeta burden. Ninety-seven percent of AD, 61% of MCI and 22% of HA cases had increased cortical PIB binding, indicating the presence of Abeta plaques. There was a strong relationship between impaired episodic memory performance and PIB binding, both in MCI and HA. This relationship was weaker in AD and less robust for non-memory cognitive domains. Abeta deposition in the asymptomatic elderly is associated with episodic memory impairment. This finding, together with the strong relationship between PIB binding and the severity of memory impairment in MCI, suggests that individuals with increased cortical PIB binding are on the path to Alzheimer's disease. The data also suggests that early intervention trials for AD targeted to non-demented individuals with cerebral Abeta deposition are warranted.
authors.affiliation: School of Psychology, Psychiatry and Psychological Medicine, Monash University, Melbourne, Australia.
authors.forename: Kerryn E
authors.initials: KE
authors.lastname: Pike
authors.forename: Greg
authors.initials: G
authors.lastname: Savage
authors.forename: Victor L
authors.initials: VL
authors.lastname: Villemagne
authors.forename: Steven
authors.initials: S
authors.lastname: Ng
authors.forename: Simon A
authors.initials: SA
authors.lastname: Moss
authors.forename: Paul
authors.initials: P
authors.lastname: Maruff
authors.forename: Chester A
authors.initials: CA
authors.lastname: Mathis
authors.forename: William E
authors.initials: WE
authors.lastname: Klunk
authors.forename: Colin L
authors.initials: CL
authors.lastname: Masters
authors.forename: Christopher C
authors.initials: CC
authors.lastname: Rowe
mesh_terms: D000368:Aged; D000544:Alzheimer Disease / Q000175:diagnosis* / Q000378:metabolism / Q000523:psychology; D016229:Amyloid beta-Peptides / Q000032:analysis*; D000814:Aniline Compounds; D001057:Apolipoproteins E / Q000235:genetics; D052160:Benzothiazoles; D015415:Biomarkers / Q000032:analysis; D002250:Carbon Radioisotopes; D016022:Case-Control Studies; D002525:Cerebellar Cortex / Q000378:metabolism / Q000473:pathology*; D016009:Chi-Square Distribution; D003072:Cognition Disorders / Q000175:diagnosis* / Q000378:metabolism / Q000523:psychology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008568:Memory; D008875:Middle Aged; D009154:Mutation; D009483:Neuropsychological Tests; D049268:Positron-Emission Tomography; D013844:Thiazoles
chemical_list: C475519:2-(4'-(methylamino)phenyl)-6-hydroxybenzothiazole; D016229:Amyloid beta-Peptides; D000814:Aniline Compounds; D001057:Apolipoproteins E; D052160:Benzothiazoles; D015415:Biomarkers; D002250:Carbon Radioisotopes; D013844:Thiazoles