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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Acta+Neuropathol+Commun
2018 ; 6
(1
): 56
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gab.com Text
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The age of onset and evolution of Braak tangle stage and Thal amyloid pathology
of Alzheimer s disease in individuals with Down syndrome
#MMPMID29973279
Davidson YS
; Robinson A
; Prasher VP
; Mann DMA
Acta Neuropathol Commun
2018[Jul]; 6
(1
): 56
PMID29973279
show ga
While post mortem studies have identified the major cell types and functional
systems affected in Alzheimer's disease (AD) the initial sites and molecular
characteristics of pathology are still unclear. Because individuals with Down
syndrome (DS) (trisomy 21) develop the full pathological changes of AD in a
predictable way by the time they reach middle to late age, a study of the brains
of such persons at different ages makes an ideal 'model system' in which the
sites of earliest onset of pathology can be detected and the subsequent
progression of changes be monitored. In the present study we have examined the
brains of 56 individuals with DS ranging from new-born to 76 years for the
presence of amyloid and tau pathology in key cortical and subcortical regions.
Amyloid pathology was found to commence in the late teens to twenties as a
deposition of diffuse plaques initially within the temporal neocortex, quickly
involving other neocortical regions but only reaching subcortical regions and
cerebellum by the late forties. Cerebral amyloid angiopathy did not regularly
commence until after 45-50 years of age. Tau pathology usually commenced after
35 years of age, initially involving not only entorhinal areas and hippocampus
but also subcortical regions such as locus caeruleus (LC) and dorsal raphe
nucleus (DRN). Later, tau pathology spread throughout the neocortex reaching
occipital lobes in most instances by mid-50 years of age. Such a pattern of
spread is consistent with that seen in typical AD. We found no evidence that tau
pathology might commence within the brain in DS before amyloid deposition had
occurred, but there was limited data that suggests tau pathology in LC or DRN
might predate that in entorhinal areas and hippocampus or at least be coincident.