BACKGROUND: Postmortem studies have suggested that β-amyloid (Aβ) deposition was only weakly related to the degree of cognitive impairment in Alzheimer's disease (AD). The development of Aβ ligands for in vivo PET imaging has greatly facilitated the assessment of this question. OBJECTIVE: The objective of the present study was to provide an overview of our current knowledge regarding the relationship between Aβ deposition and episodic memory deficits in nondemented elderly and in patients with mild cognitive impairment or AD. METHODS: Information was obtained both from studies comparing memory performance in individuals with high Pittsburgh compound B (PiB) and those with low PiB and from studies performing correlation analyses between memory performance and PiB retention considered as a continuous variable. RESULTS: Previous studies assessing the relationship between memory and global neocortical PiB reported conflicting findings, and overall suggest that this link is weak, probably indirect, and detectable only in early stages. Assessing the relationship with regional instead of global neocortical PiB, we found a specific relationship between episodic memory deficits and neocortical temporal PiB, independent from hippocampal atrophy, in the predementia stage of the disease. CONCLUSION: There is a relationship between regional Aβ deposition and episodic memory deficits in the presymptomatic stage of AD.
BACKGROUND: Postmortem studies have suggested that β-amyloid (Aβ) deposition was only weakly related to the degree of cognitive impairment in Alzheimer's disease (AD). The development of Aβ ligands for in vivo PET imaging has greatly facilitated the assessment of this question. OBJECTIVE: The objective of the present study was to provide an overview of our current knowledge regarding the relationship between Aβ deposition and episodic memory deficits in nondemented elderly and in patients with mild cognitive impairment or AD. METHODS: Information was obtained both from studies comparing memory performance in individuals with high Pittsburgh compound B (PiB) and those with low PiB and from studies performing correlation analyses between memory performance and PiB retention considered as a continuous variable. RESULTS: Previous studies assessing the relationship between memory and global neocortical PiB reported conflicting findings, and overall suggest that this link is weak, probably indirect, and detectable only in early stages. Assessing the relationship with regional instead of global neocortical PiB, we found a specific relationship between episodic memory deficits and neocortical temporal PiB, independent from hippocampal atrophy, in the predementia stage of the disease. CONCLUSION: There is a relationship between regional Aβ deposition and episodic memory deficits in the presymptomatic stage of AD.
Authors: P Payoux; J Delrieu; A Gallini; D Adel; A S Salabert; A Hitzel; C Cantet; M Tafani; D De Verbizier; J Darcourt; Ph Fernandez; J Monteil; I Carrié; T Voisin; S Gillette-Guyonnet; M Pontecorvo; B Vellas; S Andrieu Journal: Eur J Nucl Med Mol Imaging Date: 2015-05-08 Impact factor: 9.236
Authors: Clifford R Jack; David S Knopman; William J Jagust; Ronald C Petersen; Michael W Weiner; Paul S Aisen; Leslie M Shaw; Prashanthi Vemuri; Heather J Wiste; Stephen D Weigand; Timothy G Lesnick; Vernon S Pankratz; Michael C Donohue; John Q Trojanowski Journal: Lancet Neurol Date: 2013-02 Impact factor: 44.182
Authors: Kelly R Murphy; Susan M Landau; Kingshuk Roy Choudhury; Christopher A Hostage; Katie S Shpanskaya; Haris I Sair; Jeffrey R Petrella; Terence Z Wong; P Murali Doraiswamy Journal: Neuroimage Date: 2013-04-23 Impact factor: 6.556
Authors: Stephen W Scheff; Douglas A Price; Mubeen A Ansari; Kelly N Roberts; Frederick A Schmitt; Milos D Ikonomovic; Elliott J Mufson Journal: J Alzheimers Dis Date: 2015 Impact factor: 4.472
Authors: Andrea Megill; Taehee Lee; Amanda Marie DiBattista; Jung Min Song; Matthew H Spitzer; Mark Rubinshtein; Lila K Habib; Christina C Capule; Michael Mayer; R Scott Turner; Alfredo Kirkwood; Jerry Yang; Daniel T S Pak; Hey-Kyoung Lee; Hyang-Sook Hoe Journal: J Neurosci Date: 2013-05-29 Impact factor: 6.167