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Characterization of kinases involved in the phosphorylation of aggregated α-synuclein.
MedLine Citation:
PMID:  21162130     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
α-Synuclein (α-syn) is the major component of pathological inclusions characteristic of several neurodegenerative disorders, such as Parkinson's disease. The major posttranslational modification of α-syn is phosphorylation at S129, and previous studies estimate that approximately 90% of α-syn in proteinaceous, pathological inclusions is phosphorylated at this site. α-Syn can be phosphorylated by polo-like kinases (PLKs) 1-3 and casein kinases (CK) 1 and 2; however, the kinases associated with the hyperphosphorylation of aggregated α-syn are still under debate. Using a high-efficiency cellular model of α-syn aggregate formation, we found that selective inhibitors for CK2 and PLKs each partially inhibited S129 phosphorylation of soluble (nonaggregated) α-syn, but only PLK inhibitors modestly attenuated the phosphorylation of aggregated α-syn. In addition, none of the kinase inhibitors used had a substantial effect on the propensity of α-syn to aggregate. Overexpression of all PLKs promoted robust phosphorylation of soluble α-syn, but none altered the propensity of α-syn to aggregate. Overexpression of only PLK2 increased phosphorylation of aggregated α-syn at S129, which likely is due to increased phosphorylation of soluble α-syn, which then was incorporated into aggregates. Overexpression of PLK1 and treatment with BI2536 resulted in a significant reduction of phosphorylated, aggregated α-syn protein, beyond that of BI2536 treatment alone. These studies suggest that phosphorylation of α-syn is independent of α-syn aggregate formation, that PLK1 is involved in the phosphorylation of aggregated α-syn at S129 in this system, and that mechanisms resulting in hyperphosphorylation of aggregated α-syn appear to be independent of those responsible for the phosphorylation of soluble α-syn.
Authors:
Elisa A Waxman; Benoit I Giasson
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2010-12-08
Journal Detail:
Title:  Journal of neuroscience research     Volume:  89     ISSN:  1097-4547     ISO Abbreviation:  J. Neurosci. Res.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2010-12-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7600111     Medline TA:  J Neurosci Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  231-47     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Wiley-Liss, Inc.
Affiliation:
Department of Pharmacology, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
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Descriptor/Qualifier:
Grant Support
ID/Acronym/Agency:
AG09215/AG/NIA NIH HHS; NS053488/NS/NINDS NIH HHS; T32 AG00255/AG/NIA NIH HHS

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