File(s) under permanent embargo
Early induction of chalpains in rotenone-mediated neuronal apoptosis
journal contribution
posted on 2006-04-01, 00:00 authored by M Chen, Y Yap, M Choy, C Koh, S Seet, Wei DuanWei Duan, M Whiteman, Steve CheungRotenone is an inhibitor of mitochondrial complex I that produces a model of Parkinson's disease (PD), where neurons undergo apoptosis by caspase-dependent and/or caspase-independent pathways. Inhibition of calpains has recently been shown to attenuate neuronal apoptosis. This study aims to establish for the first time, the time-point of calpain activation with respect to the caspase activation and the possibility of cell cycle re-entry in rotenone-mediated cell death. Immunoblot results revealed calpain activation occurred at 5, 10 h prior to caspase-3 activation (at 15 h), suggesting calpain activation was an earlier cellular event compared to caspase activation in the rotenone-mediated apoptosis. In addition, an upregulation of phospho-p53 was observed at 21 h. However, no expression or upregulation of cell cycle regulatory proteins including cdc25a, cyclin-D1 and cyclin-D3 were observed, strongly suggesting that cell cycle re-entry did not occur. These findings provide new insights into the differential patterns of calpain and caspase activation that result from rotenone poisoning and which may be relevant to the therapeutic management of PD.
History
Journal
Neuroscience lettersVolume
397Issue
1-2Pagination
69 - 73Publisher
Elsvier Ireland LtdLocation
Limerick, IrelandPublisher DOI
ISSN
0304-3940eISSN
1872-7972Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2005, Elsevier Ireland Ltd.Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC