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2015 ; 36
(9
): 2468-74
Nephropedia Template TP
gab.com Text
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English Wikipedia
Down syndrome individuals with Alzheimer s disease have a distinct
neuroinflammatory phenotype compared to sporadic Alzheimer s disease
#MMPMID26103884
Wilcock DM
; Hurban J
; Helman AM
; Sudduth TL
; McCarty KL
; Beckett TL
; Ferrell JC
; Murphy MP
; Abner EL
; Schmitt FA
; Head E
Neurobiol Aging
2015[Sep]; 36
(9
): 2468-74
PMID26103884
show ga
Down syndrome (DS) is the most common genetic cause of intellectual disability
and is primarily caused by the triplication of chromosome 21. The overexpression
of amyloid precursor protein gene may be sufficient to drive Alzheimer's disease
(AD) neuropathology that is observed in virtually all individuals with DS by the
age of 40 years. There is relatively little information about inflammation in the
DS brain and how the genetics of DS may alter inflammatory responses and modify
the course of AD pathogenesis in this disorder. Using the macrophage
classification system of M1, M2a, M2b, and M2c inflammatory phenotypes, we have
shown that the early stages of AD are associated with a bias toward an M1 or M2a
phenotype. In later stages of AD, markers of M1, M2a and M2c are elevated. We now
report the inflammatory phenotype in a DS autopsy series to compare this with the
progression in sporadic AD. Tissue from young DS cases (under 40 years of age,
pre-AD) show a bias toward M1 and M2b states with little M2a or M2c observed.
Older DS cases (over 40 with AD pathology) show a distinct bias toward an M2b
phenotype. Importantly, this is distinct from sporadic AD where the M2b phenotype
has been rarely, if ever observed in postmortem studies. Stimulated by immune
complex activation of microglial cells and toll-like receptor activation, the M2b
phenotype represents a unique neuroinflammatory state in diseased brain and may
have significant implications for therapeutic intervention for persons with DS.