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Subcellular localisation of Cdc25A determines cell fate.
C Leisser1, G Rosenberger, S Maier
1Institute of Clinical Pathology, University of Vienna, Waehringer Guertel 18-20, Vienna A-1090, Austria.
Cell Death and Differentiation
|September 13, 2003
Summary
Cell division cycle 25A (Cdc25A) affects cell survival differently based on its location. Cytoplasmic Cdc25A promotes survival, while nuclear Cdc25A can trigger apoptosis by affecting transcription factors.
Area of Science:
- Cell Biology
- Molecular Oncology
Background:
- Cell division cycle 25A (Cdc25A) is implicated in cell cycle regulation and has been observed in both nuclear and cytoplasmic compartments.
- Overexpression of Cdc25A has been linked to promoting cell survival through pathways like PKB activation.
Purpose of the Study:
- To investigate the role of subcellular localization of Cdc25A in regulating apoptosis.
- To determine if the anti-apoptotic effects of Cdc25A are dependent on its cellular compartment.
Main Methods:
- Utilized a Cdc25A:ER fusion protein to control the subcellular localization of Cdc25A between the cytoplasm and nucleus.
- Examined the effects of Cdc25A localization on the proapoptotic transcription factor FKHRL1 and its target genes in rat and human cell lines.
Main Results:
- In rat 423 cells, the anti-apoptotic effect of Cdc25A was confined to its cytoplasmic localization.
- In human N.1 ovarian carcinoma cells, nuclear Cdc25A overexpression led to FKHRL1 dephosphorylation and nuclear retention.
- Nuclear Cdc25A promoted apoptosis through increased expression of Fas ligand and Bim in human cells.
Conclusions:
- The oncogenic function of Cdc25A in cancer is context-dependent, influencing apoptosis susceptibility based on its subcellular distribution.
- Cell-type-specific localization of Cdc25A dictates whether it promotes cell survival or induces apoptosis.