TY - JOUR
T1 - Formation of toxic oligomeric α-synuclein species in living cells
AU - Outeiro, Tiago Fleming
AU - Putcha, Preeti
AU - Tetzlaff, Julie E.
AU - Spoelgen, Robert
AU - Koker, Mirjam
AU - Carvalho, Filipe
AU - Hyman, Bradley T.
AU - McLean, Pamela J.
PY - 2008/4/2
Y1 - 2008/4/2
N2 - Background: Misfolding, oligomerization, and fibrillization of α-synuclein are thought to be central events in the onset and progression of Parkinson's desease (PD) and related disorders. Although fibrillar α-synuclein is a major components of Lewy bodies (LBs), recent data implicate prefibrillar, oligomeric intermediates as the toxic species. However, to date, oligomeric species have not-been identified in living cells. Methodology/Principal Findings: Here we used bimolecular flourescence complementation (BiFC) to directly visualize α-synuclein oligomerization in living cells, allowing us to study the initial events leading to α-synuclein oligomerization, the precursor to aggregate formation. This novel assay provides us with a tool with which to investigate how manipulations affecting α-synuclein aggregation affect the process over time. Stabilization of α-synuclein oligomers via BiFC results in increased cytoxixity, which can be rescued by Hsp70 in a process that reduces the formation of α-synuclein oligomers. Introduction of PD-assisted mutations in α-synuclein did not affect oligomer formation but the biochemical properties of the mutant α-synuclein oligomers differ from those of wild type α-synuclein. Conclusion/Significance: This novel application of the BiFC assay to the study of the molecular basis of neurodegenerative disroders enabled the direct vissualization of α-synuclein oligomeric species in living cells and its mudulation by Hsp70, constituting a novel important tool in the search for the synucleinopathies.
AB - Background: Misfolding, oligomerization, and fibrillization of α-synuclein are thought to be central events in the onset and progression of Parkinson's desease (PD) and related disorders. Although fibrillar α-synuclein is a major components of Lewy bodies (LBs), recent data implicate prefibrillar, oligomeric intermediates as the toxic species. However, to date, oligomeric species have not-been identified in living cells. Methodology/Principal Findings: Here we used bimolecular flourescence complementation (BiFC) to directly visualize α-synuclein oligomerization in living cells, allowing us to study the initial events leading to α-synuclein oligomerization, the precursor to aggregate formation. This novel assay provides us with a tool with which to investigate how manipulations affecting α-synuclein aggregation affect the process over time. Stabilization of α-synuclein oligomers via BiFC results in increased cytoxixity, which can be rescued by Hsp70 in a process that reduces the formation of α-synuclein oligomers. Introduction of PD-assisted mutations in α-synuclein did not affect oligomer formation but the biochemical properties of the mutant α-synuclein oligomers differ from those of wild type α-synuclein. Conclusion/Significance: This novel application of the BiFC assay to the study of the molecular basis of neurodegenerative disroders enabled the direct vissualization of α-synuclein oligomeric species in living cells and its mudulation by Hsp70, constituting a novel important tool in the search for the synucleinopathies.
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U2 - 10.1371/journal.pone.0001867
DO - 10.1371/journal.pone.0001867
M3 - Article
C2 - 18382657
AN - SCOPUS:44849125207
SN - 1932-6203
VL - 3
JO - PloS one
JF - PloS one
IS - 4
M1 - e1867
ER -