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Endogenous catecholamine enhances the dysfunction of unfolded protein response and α-synuclein oligomerization in PC12 cells overexpressing human α-synuclein

Authors
Publisher
Elsevier Ireland Ltd
Publication Date
Volume
66
Issue
1
Identifiers
DOI: 10.1016/j.neures.2009.10.005
Keywords
  • Parkinson'S Disease
  • α-Synuclein
  • Catecholamine
  • Quinone
  • Unfolded Protein Response
  • Er Stress
Disciplines
  • Biology
  • Medicine

Abstract

Abstract Parkinson's disease (PD) is a neurodegenerative disorder characterized by the selective loss of dopaminergic neurons and the presence of Lewy bodies. α-Synuclein is a major component of Lewy bodies. Recently, many studies have focused on the interaction between α-synuclein and catecholamine in the pathogenesis of PD. However, no detailed relationship between cathecholamine and α-synuclein cytotoxicity has been elucidated. Therefore, this study established PC12 cell lines which overexpress human α-synuclein in a tetracycline-inducible manner. The overexpression of human α-synuclein increased the number of apoptotic cells in a long-term culture. Moreover, human α-synuclein expressing PC12 cells demonstrated an increased vulnerability to several stressors in a short culture period. Thapsigargin increased the SDS soluble oligomers of α-synuclein associated with catecholamine-quinone. The unfolded protein response (UPR) study showed that thapsigargin increased eIF2α phosphorylation and nuclear GADD153/CHOP induction under α-synuclein overexpressed conditions. The activities of the ATF6α and IRE1α pathways decreased. These findings suggest that an overexpression of α-synuclein partly inactivates the UPR. α-Methyltyrosine inhibited the dysfunction of the UPR caused by an overexpression of human α-synuclein. Therefore, these findings suggest that the coexistence of human α-synuclein with catecholamine enhances the endoplasmic reticulum stress-related toxicity in PD pathogenesis.

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