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2017 ; 12
(10
): e0186636
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In situ fibrillizing amyloid-beta 1-42 induces neurite degeneration and apoptosis
of differentiated SH-SY5Y cells
#MMPMID29065138
Krishtal J
; Bragina O
; Metsla K
; Palumaa P
; Tõugu V
PLoS One
2017[]; 12
(10
): e0186636
PMID29065138
show ga
The progression of Alzheimer's disease is causatively linked to the accumulation
of amyloid-? aggregates in the brain, however, it is not clear how the amyloid
aggregates initiate the death of neuronal cells. The in vitro toxic effects of
amyloid peptides are most commonly examined using the human neuroblastoma derived
SH-SY5Y cell line and here we show that differentiated neuron-like SH-SY5Y cells
are more sensitive to amyloid peptides than non-differentiated cells, because the
latter lack long neurites. Exogenous soluble amyloid-? 1-42 covered cell bodies
and whole neurites in differentiated cells with dense fibrils, causing neurite
beading and fragmentation, whereas preformed amyloid-? 1-42 fibrils had no toxic
effects. Importantly, spontaneously fibrillizing amyloid-? 1-42 peptide exhibited
substantially higher cellular toxicity than amyloid-? 1-40, which did not form
fibrils under the experimental conditions. These results support the hypothesis
that peptide toxicity is related to the active fibrillization process in the
incubation mixture.