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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Piwnica-worms, H. Paules, R. S. Downes, C. S. Kaufmann, W. K. Graves, P. R. Deming, P. B. Cistulli, C. A. Zhao, H. |
| Description | Author Affiliation: Deming PB ( Department of Pathology and Laboratory Medicine and Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599, USA.); |
| Abstract | Chromatid catenation is actively monitored in human cells, with progression from G(2) to mitosis being inhibited when chromatids are insufficiently decatenated. Mitotic delay was quantified in normal and checkpoint-deficient human cells during treatment with ICRF-193, a topoisomerase II catalytic inhibitor that prevents chromatid decatenation without producing topoisomerase-associated DNA strand breaks. Ataxia telangiectasia (A-T) cells, defective in DNA damage checkpoints, showed normal mitotic delay when treated with ICRF-193. The mitotic delay in response to ICRF-193 was ablated in human fibroblasts expressing an ataxia telangiectasia mutated- and rad3-related (ATR) kinase-inactive ATR allele (ATR(ki)). BRCA1-mutant HCC1937 cells also displayed a defect in ICRF-193-induced mitotic delay, which was corrected by expression of wild-type BRCA1. Phosphorylations of hCds1 or Chk1 and inhibition of Cdk1 kinase activity, which are elements of checkpoints associated with DNA damage or replication, did not occur during ICRF-193-induced mitotic delay. Over-expression of cyclin B1 containing a dominant nuclear localization signal, and inhibition of Crm1-mediated nuclear export, reversed ICRF-193-induced mitotic delay. In combination, these results imply that ATR and BRCA1 enforce the decatenation G(2) checkpoint, which may act to exclude cyclin B1/Cdk1 complexes from the nucleus. Moreover, induction of ATR(ki) produced a 10-fold increase in chromosomal aberrations, further emphasizing the vital role for ATR in genetic stability. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 21 |
| Volume Number | 98 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2001-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | BRCA1 Protein Metabolism CDC2 Protein Kinase Cell Cycle Proteins Cyclin B Mitosis Physiology Protein-Serine-Threonine Kinases Signal Transduction Topoisomerase II Inhibitors Ataxia Telangiectasia Ataxia Telangiectasia Mutated Proteins Cell Line Cell Nucleus Checkpoint Kinase 2 Cyclin B1 DNA-Binding Proteins G2 Phase Drug Effects Phosphorylation Piperazines Pharmacology Protein Kinases Tumor Suppressor Proteins Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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