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2017 ; 12
(4
): e0175767
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gab.com Text
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English Wikipedia
C1q ablation exacerbates amyloid deposition: A study in a transgenic mouse model
of ATTRV30M amyloid neuropathy
#MMPMID28407005
Panayiotou E
; Fella E
; Papacharalambous R
; Malas S
; Saraiva MJ
; Kyriakides T
PLoS One
2017[]; 12
(4
): e0175767
PMID28407005
show ga
ATTRV30M amyloid neuropathy is a lethal autosomal dominant sensorimotor and
autonomic neuropathy, caused by deposition of amyloid fibrils composed of
aberrant transthyretin (TTR). Ages of onset and penetrance exhibit great
variability and genetic factors have been implicated. Complement activation
co-localizes with amyloid deposits in amyloidotic neuropathy and is possibly
involved in the kinetics of amyloidogenesis. A candidate gene approach has
recently identified C1q polymorphisms to correlate with disease onset in a
Cypriot cohort of patients with ATTRV30M amyloid neuropathy. In the current study
we use a double transgenic mouse model of ATTRV30M amyloid neuropathy in which
C1q is ablated to elucidate further a possible modifier role for C1q. Amyloid
deposition is found to be increased by 60% in the absence of C1q. Significant up
regulation is also recorded in apoptotic and cellular stress markers reflecting
extracellular toxicity of pre-fibrillar and fibrillar TTR. Our data further
indicate that in the absence of C1q there is marked reduction of macrophages in
association with amyloid deposits and thus less effective phagocytosis of TTR.