Proteomic analysis reveals a protective role for DJ-1 during 6-hydroxydopamine-induced cell death.

Abstract:

:Loss-of-function mutations in the DJ-1/PARK7 gene are responsible for early-onset autosomal-recessive Parkinson's disease. DJ-1 is implicated in the protection of neurons from oxidative stress by scavenging hydrogen peroxide and regulating the transcriptional activity of multiple pathways. Here, we attempted to identify the protein profiles modulated by DJ-1 in MN9D dopaminergic neurons following 6-hydroxydopamine (6-OHDA) treatment. We found that reactive oxygen species (ROS) levels increased in DJ-1-deficient cells that were either untreated or subjected to 6-OHDA treatment. The incidence of apoptosis after 6-OHDA treatment was increased in DJ-1 knockdown cells. Using these cells, we then performed two-dimensional gel electrophoresis in conjunction with mass spectrometry to assess changes in protein profiles before and after 6-OHDA treatment. Several protein spots were positively or negatively altered in DJ-1-deficient cells with or without 6-OHDA. Among the altered proteins, immunoblot analysis confirmed an increase in galectin-7 and a decrease in peroxiredoxin-6 in DJ-1 knockdown cells. Moreover, transcriptional levels of putative p53 target proteins, including selenophosphate synthetase 1 and glycogen phosphorylase, were increased in the DJ-1 knockdown cells. Taken together, our data suggest that increases in pro-apoptotic proteins and decreases in anti-apoptotic proteins render DJ-1 knockdown cells more susceptible to oxidative stress.

authors

Kim SJ,Park YJ,Oh YJ

doi

10.1016/j.bbrc.2012.04.063

subject

Has Abstract

pub_date

2012-05-25 00:00:00

pages

8-14

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(12)00730-9

journal_volume

422

pub_type

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