2015
DOI: 10.2967/jnumed.114.149302
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Prefrontal Hypometabolism in Alzheimer Disease Is Related to Longitudinal Amyloid Accumulation in Remote Brain Regions

Abstract: In PET studies of patients with Alzheimer disease (AD), prominent hypometabolism can occur in brain regions without major amyloid load. These hypometabolism-only (HO) areas may not be explained easily as a consequence of local amyloid toxicity. The aim of this longitudinal multimodal imaging study was the investigation of locoregional and remote relationships between metabolism in HO areas and longitudinal amyloid increase in functionally connected brain areas, with a particular focus on intrinsic functional c… Show more

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Cited by 52 publications
(36 citation statements)
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“…As one of the major roles of mPFC is control of overall acetylcholine input from subcortical neuromodulatory systems [Van de Werd et al, 2010], absence of synchronized neuromagnetic activity in mPFC during auditory gating may reflect dysfunction of fast cholinergic signal transmission between mPFC and primary sensory areas in AD. Such mPFC gating dysfunction may result in PFC hypometabolism reported in AD patients [Coleman 2005;Klunk et al, 2004;Klupp et al, 2015;Rapoport et al, 1986]. Moreover, the subtype of alpha-7-nAChr bearing neurons which are highly involved in synaptic gating regulation [Freedman et al, 2003] and are especially vulnerable to bamyloid damage [D'Andrea and Nagele, 2006] are found in PFC regions [Poorthuis et al, 2012].…”
Section: Discussionmentioning
confidence: 99%
“…As one of the major roles of mPFC is control of overall acetylcholine input from subcortical neuromodulatory systems [Van de Werd et al, 2010], absence of synchronized neuromagnetic activity in mPFC during auditory gating may reflect dysfunction of fast cholinergic signal transmission between mPFC and primary sensory areas in AD. Such mPFC gating dysfunction may result in PFC hypometabolism reported in AD patients [Coleman 2005;Klunk et al, 2004;Klupp et al, 2015;Rapoport et al, 1986]. Moreover, the subtype of alpha-7-nAChr bearing neurons which are highly involved in synaptic gating regulation [Freedman et al, 2003] and are especially vulnerable to bamyloid damage [D'Andrea and Nagele, 2006] are found in PFC regions [Poorthuis et al, 2012].…”
Section: Discussionmentioning
confidence: 99%
“…In general, reductions in glucose metabolism can reflect neuronal senescence and loss of dendrites, but can also arise from deafferentation, when inputs driving tonic activity are lost. 34,35 From a functional point of view, the described pattern of reduced metabolism probably underlies the characteristic symptoms that define the diagnosis of the CBS. According to Armstrong, 1 CBD can only be confirmed by neuropathology postmortem.…”
Section: Discussionmentioning
confidence: 99%
“…The healthy control groups were provided by AVID Radiopharmaceuticals ([ 18 F]AV‐1451; N = 15, Age Mean = 64.4, MMSE=29.5), from the Alzheimer's Disease Imaging database (http://adni.loni.usc.edu; [ 18 F]FDG PET N = 18, Age Mean = 65.8, MMSE = 29.1*; *MMSE scores for three healthy controls were not available from the ADNI database), and 15 healthy controls (Age Mean = 64.0, MMSE = 29.2) who underwent a [ 11 C]PiB PET imaging protocol 8. We then computed z ‐score deviations for every voxel ( x ) using the formula )(z=xμitalicσ.…”
Section: Methodsmentioning
confidence: 99%