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Published in: Molecular Neurodegeneration 1/2011

Open Access 01-12-2011 | Short report

Cu, Zn-superoxide dismutase 1 (SOD1) is a novel target of Puromycin-sensitive aminopeptidase (PSA/NPEPPS): PSA/NPEPPS is a possible modifier of amyotrophic lateral sclerosis

Authors: Guijie Ren, Zhongcai Ma, Maria Hui, Lili C Kudo, Koon-Sea Hui, Stanislav L Karsten

Published in: Molecular Neurodegeneration | Issue 1/2011

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Abstract

Accumulation of misfolded neurotoxic Cu, Zn-superoxide dismutase-1 (SOD1) protein found in both familial and sporadic amyotrophic lateral sclerosis (ALS) is recognized as an important contributing factor of neuronal cell death. However, little is known about the mechanisms controlling the accumulation and turnover of SOD1 protein. Puromycin-sensitive aminopeptidase (PSA/NPEPPS) was recently identified as a major peptidase acting on neurotoxic TAU protein and protecting against TAU-induced neurodegeneration. In addition, recent report implicated PSA/NPEPPS in the direct removal of neurotoxic polyglutamine repeats. These combined data suggest that PSA/NPEPPS might represent a novel degradation pathway targeting pathologically aggregating neurotoxic protein substrates including SOD1. Here, we report that PSA/NPEPPS directly regulates SOD1 protein abundance and clearance via proteolysis. In addition, PSA/NPEPPS expression is significantly decreased in motor neurons of both SOD G93A transgenic mice and sporadic ALS patients, suggesting its possible contribution to the disease pathogenesis. These results implicate SOD1 as a new target protein of PSA/NPEPPS and point to the possible neuroprotective role of PSA/NPEPPS in ALS.
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Metadata
Title
Cu, Zn-superoxide dismutase 1 (SOD1) is a novel target of Puromycin-sensitive aminopeptidase (PSA/NPEPPS): PSA/NPEPPS is a possible modifier of amyotrophic lateral sclerosis
Authors
Guijie Ren
Zhongcai Ma
Maria Hui
Lili C Kudo
Koon-Sea Hui
Stanislav L Karsten
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Molecular Neurodegeneration / Issue 1/2011
Electronic ISSN: 1750-1326
DOI
https://doi.org/10.1186/1750-1326-6-29

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