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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kiviharju-af Hällström, Taija M. Andersson, Leif C. Peltonen, Karita Medema, René H. Peehl, Donna M. Mönkkönen, Mia Jäämaa, Sari Laiho, Marikki |
| Description | Author Affiliation: Kiviharju-af Hällström TM ( Molecular Cancer Biology Program, Biomedicum Helsinki and Haartman Institute, University of Helsinki, P.O. Box 63, FIN-00014 Helsinki, Finland.); |
| Abstract | Cellular DNA damage triggers the DNA damage response pathway and leads to enforcement of cell cycle checkpoints, which are essential for the maintenance of genomic integrity and are activated in early stages of tumorigenesis. A special feature of prostate cancer is its high incidence and multifocality. To address the functionality of DNA damage checkpoints in the prostate, we analyzed the responses of human primary prostate epithelial cells (HPECs) and freshly isolated human prostate tissues to gamma-irradiation. We find that gamma-irradiation activates the ataxia telangiectasia mutated-associated DNA damage response pathway in the HPECs but that the clearance of phosphorylated histone H2AX (gammaH2AX) foci is delayed. Surprisingly, gamma-irradiated HPECs were unable to enforce cell cycle checkpoint arrest and had sustained cyclin-dependent kinase 2 (Cdk2)-associated kinase activity because of a lack of inhibitory Cdk phosphorylation by Wee1A tyrosine kinase. We further show that HPECs express low levels of Wee1A and that ectopic Wee1A efficiently rescues the checkpoints. We recapitulate the absence of checkpoint responses in epithelium of ex vivo irradiated human prostate tissue despite robust induction of gammaH2AX. The findings show that prostate epithelium has a surprising inability to control checkpoint arrest, the lack of which may predispose to accrual of DNA lesions. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 17 |
| Volume Number | 104 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2007-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Cycle Proteins Metabolism Cell Cycle DNA Damage Epithelium Enzymology Nuclear Proteins Prostate Protein-Tyrosine Kinases Ataxia Telangiectasia Mutated Proteins Radiation Effects Cell Line, Tumor Cyclin-Dependent Kinase 2 DNA-Binding Proteins Enzyme Activation Epithelial Cells Cytology Phosphotyrosine Protein-Serine-Threonine Kinases Radiation, Ionizing Signal Transduction Tumor Suppressor Protein P53 Tumor Suppressor Proteins Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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