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2017 ; 7
(1
): 15661
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gab.com Text
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English Wikipedia
Proteotoxicity in cardiac amyloidosis: amyloidogenic light chains affect the
levels of intracellular proteins in human heart cells
#MMPMID29142197
Imperlini E
; Gnecchi M
; Rognoni P
; Sabidò E
; Ciuffreda MC
; Palladini G
; Espadas G
; Mancuso FM
; Bozzola M
; Malpasso G
; Valentini V
; Palladini G
; Orrù S
; Ferraro G
; Milani P
; Perlini S
; Salvatore F
; Merlini G
; Lavatelli F
Sci Rep
2017[Nov]; 7
(1
): 15661
PMID29142197
show ga
AL amyloidosis is characterized by widespread deposition of immunoglobulin light
chains (LCs) as amyloid fibrils. Cardiac involvement is frequent and leads to
life-threatening cardiomyopathy. Besides the tissue alteration caused by fibrils,
clinical and experimental evidence indicates that cardiac damage is also caused
by proteotoxicity of prefibrillar amyloidogenic species. As in other amyloidoses,
the damage mechanisms at cellular level are complex and largely undefined. We
have characterized the molecular changes in primary human cardiac fibroblasts
(hCFs) exposed in vitro to soluble amyloidogenic cardiotoxic LCs from AL
cardiomyopathy patients. To evaluate proteome alterations caused by a
representative cardiotropic LC, we combined gel-based with label-free shotgun
analysis and performed bioinformatics and data validation studies. To assess the
generalizability of our results we explored the effects of multiple LCs on hCF
viability and on levels of a subset of cellular proteins. Our results indicate
that exposure of hCFs to cardiotropic LCs translates into proteome remodeling,
associated with apoptosis activation and oxidative stress. The proteome
alterations affect proteins involved in cytoskeletal organization, protein
synthesis and quality control, mitochondrial activity and metabolism, signal
transduction and molecular trafficking. These results support and expand the
concept that soluble amyloidogenic cardiotropic LCs exert toxic effects on
cardiac cells.