Inhibition of the G2 DNA Damage Checkpoint and of Protein Kinases Chk1 and Chk2 by the Marine Sponge Alkaloid Debromohymenialdisine
| Autor: | Aaron A. Goodarzi, Paul Clarke, Darko Curman, Bruno Cinel, Bin-Bing S. Zhou, David E. Williams, James R. A. Hutchins, Wesley D. Block, Michel Roberge, Raymond J. Andersen, Susan P. Lees-Miller, Natalie T. Rundle |
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| Rok vydání: | 2001 |
| Předmět: |
G2 Phase
DNA damage DNA repair Protein Serine-Threonine Kinases Biology Biochemistry Cell Line Alkaloids Animals Pyrroles CHEK1 Enzyme Inhibitors Protein kinase A Protein Kinase Inhibitors Molecular Biology Kinase Azepines Cell Biology G2-M DNA damage checkpoint Porifera Cell biology Checkpoint Kinase 2 Checkpoint Kinase 1 Cancer cell Signal transduction Protein Kinases DNA Damage Signal Transduction |
| Zdroj: | ResearcherID |
| ISSN: | 0021-9258 |
| Popis: | Cells can respond to DNA damage by activating checkpoints that delay cell cycle progression and allow time for DNA repair. Chemical inhibitors of the G(2) phase DNA damage checkpoint may be used as tools to understand better how the checkpoint is regulated and may be used to sensitize cancer cells to DNA-damaging therapies. However, few inhibitors are known. We used a cell-based assay to screen natural extracts for G(2) checkpoint inhibitors and identified debromohymenialdisine (DBH) from a marine sponge. DBH is distinct structurally from previously known G(2) checkpoint inhibitors. It inhibited the G(2) checkpoint with an IC(50) of 8 micrometer and showed moderate cytotoxicity (IC(50) = 25 micrometer) toward MCF-7 cells. DBH inhibited the checkpoint kinases Chk1 (IC(50) = 3 micrometer) and Chk2 (IC(50) = 3.5 micrometer) but not ataxia-telangiectasia mutated (ATM), ATM-Rad3-related protein, or DNA-dependent protein kinase in vitro, indicating that it blocks two major branches of the checkpoint pathway downstream of ATM. It did not cause the activation or inhibition of different signal transduction proteins, as determined by mobility shift analysis in Western blots, suggesting that it inhibits a narrow range of protein kinases in vivo. |
| Databáze: | OpenAIRE |
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