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2016 ; 6
(ä): 23116
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Functionally different ?-synuclein inclusions yield insight into Parkinson s
disease pathology
#MMPMID26984067
Raiss CC
; Braun TS
; Konings IB
; Grabmayr H
; Hassink GC
; Sidhu A
; le Feber J
; Bausch AR
; Jansen C
; Subramaniam V
; Claessens MM
Sci Rep
2016[Mar]; 6
(ä): 23116
PMID26984067
show ga
The formation of ?-synuclein (?-S) amyloid aggregates, called Lewy bodies (LBs),
is a hallmark of Parkinson's disease (PD). The function of LBs in the disease
process is however still unclear; they have been associated with both
neuroprotection and toxicity. To obtain insight into this contradiction, we
induced the formation of ?-S inclusions, using three different induction methods
in SH-SY5Y cells and rat-derived primary neuronal cells. Using confocal and STED
microscopy we observed induction-dependent differences in ?-S inclusion
morphology, location and function. The aggregation of ?-S in functionally
different compartments correlates with the toxicity of the induction method
measured in viability assays. The most cytotoxic treatment largely correlates
with the formation of proteasome-associated, juxta-nuclear inclusions. With less
toxic methods cytosolic deposits that are not associated with the proteasome are
more prevalent. The distribution of ?-S over at least two different types of
inclusions is not limited to cell models, but is also observed in primary
neuronal cells and in human mesencephalon. The existence of functionally
different LBs, in vivo and in vitro, gives important insights in the impact of
Lewy Body formation on neuronal functioning and may thereby provide a platform
for discovering therapeutics.