Cell cycle checkpoint signaling involved in histone deacetylase inhibition and radiation-induced cell death
| Autor: | Anne Hansen Ree, Gunhild Harman, Åse Bratland, Ragnhild V. Nome, Yvonne Andersson, Øystein Fodstad |
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| Rok vydání: | 2005 |
| Předmět: |
Radiation-Sensitizing Agents
Cancer Research Cell cycle checkpoint Apoptosis Breast Neoplasms Cell Cycle Proteins Biology Hydroxamic Acids Histones Radiation Ionizing Humans CHEK1 Histone deacetylase 5 Cell Cycle Acetylation G2-M DNA damage checkpoint Cell cycle Cell biology Chromatin Histone Deacetylase Inhibitors Oncology Checkpoint Kinase 1 Cancer research Female Histone deacetylase Poly(ADP-ribose) Polymerases Tumor Suppressor Protein p53 Protein Kinases G1 phase Signal Transduction |
| Zdroj: | Molecular Cancer Therapeutics. 4:1231-1238 |
| ISSN: | 1538-8514 1535-7163 |
| DOI: | 10.1158/1535-7163.mct-04-0304 |
| Popis: | In breast cancer, radiation has a central role in the treatment of brain metastasis, although tumor sensitivity might be limited. The tumor cell defense response to ionizing radiation involves activation of cell cycle checkpoint signaling. Histone deacetylase (HDAC) inhibitors, agents that cause hyperacetylation of histone proteins and thereby aberrations in the chromatin structure, may also override the DNA damage defense response and facilitate the radiation-induced mitotic cell death. In experimental metastasis models, the human breast carcinoma cell line MA-11 invariably disseminates to the central nervous system. We compared profiles of in vitro MA-11 cell cycle response to ionizing radiation and HDAC inhibition. After radiation exposure, the G2-M phase accumulation and the preceding repression of the G2 phase regulatory factors Polo-like kinase-1 and cyclin B1 required intact G2 checkpoint signaling through the checkpoint kinase CHK1, whereas the similar phenotypic changes observed with HDAC inhibition did not. MA-11 cells did not show radiation-induced expression of the G1 cell cycle inhibitor p21, indicative of a defective G1 checkpoint and consistent with a point mutation detected in the tumor suppressor TP53 gene. Increase in the p21 level, however, was observed with HDAC inhibition. Following pretreatment with the HDAC inhibitor, the efficiency of clonogenic regrowth after irradiation was reduced, which is in accordance with the concept of increased probability of mitotic cell death when the chromatin structure is disrupted. Among molecular cell cycle–targeted drugs currently in the pipeline for testing in early-phase clinical trials, HDAC inhibitors may have therapeutic potential as radiosensitizers. |
| Databáze: | OpenAIRE |
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