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2017 ; 12
(9
): e0184384
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Spinal cord homogenates from SOD1 familial amyotrophic lateral sclerosis induce
SOD1 aggregation in living cells
#MMPMID28877271
Pokrishevsky E
; Hong RH
; Mackenzie IR
; Cashman NR
PLoS One
2017[]; 12
(9
): e0184384
PMID28877271
show ga
Mutant Cu/Zn superoxide dismutase (SOD1) can confer its misfolding on wild-type
SOD1 in living cells; the propagation of misfolding can also be transmitted
between cells in vitro. Recent studies identified fluorescently-tagged SOD1G85R
as a promiscuous substrate that is highly prone to aggregate by a variety of
templates, in vitro and in vivo. Here, we utilized several SOD1-GFP reporter
proteins with G37R, G85R, or G93A mutations in SOD1. We observed that human
spinal cord homogenates prepared from SOD1 familial ALS (FALS) can induce
significantly more intracellular reporter protein aggregation than spinal cord
homogenates from sporadic ALS, Alzheimer's disease, multiple system atrophy or
healthy control individuals. We also determined that the induction of reporter
protein aggregation by SOD1-FALS tissue homogenates can be attenuated by
incubating the cells with the SOD1 misfolding-specific antibody 3H1, or the small
molecule 5-fluorouridine. Our study further implicates SOD1 as the seeding
particle responsible for the spread of SOD1-FALS neurodegeneration from its
initial onset site(s), and demonstrates two potential therapeutic strategies for
SOD1-mediated disease. This work also comprises a medium-throughput cell-based
platform of screening potential therapeutics to attenuate propagated aggregation
of SOD1.