| Chromatin remodelling at the topoisomerase II-beta promoter is associated with enhanced sensitivity to etoposide in human neuroblastoma cell lines. | |
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MedLine Citation:
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PMID: 20886683 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Etoposide, an inhibitor of topoisomerase II, promotes DNA damage and apoptosis of cancer cells and is a component of standard therapy for neuroblastoma. Resistance to etoposide has been observed in neural tumour cells expressing lower levels of topoisomerase II. In the present study, we have examined the contribution of epigenetic modulation of gene expression in the potentiation of etoposide-mediated cytotoxicity in neuroblastoma cells. Specifically, we studied the effects of histone deacetylase inhibition with valproic acid on topoisomerase II gene expression and apoptosis in response to etoposide. Using human neuroblastoma cell lines SK-N-AS and SK-N-SH, we show that although the combination of valproic acid and etoposide promoted a reduction in growth compared to either drug alone in both cells, the effect was substantially enhanced in SK-N-AS compared to SK-N-SH cells. An increase in histone H3 acetylation and p21 expression was observed in both cell lines, however, upregulation of topoisomerase II-beta gene expression and an increase in PARP cleavage was observed in SK-N-AS cells only. Furthermore, chromatin immunoprecipitation assays revealed an increase in acetylation of histone H3 at the cognate topoisomerase II-beta gene after treatment with valproic acid in SK-N-AS cells. These results suggest a potential epigenetic mechanism of regulation of the topoisomerase II-beta gene and a possible role for its increased expression in the sensitivity of SK-N-AS neuroblastoma cells to etoposide. |
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Authors:
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Chandra M Das; Peter E Zage; Pete Taylor; Dolly Aguilera; Johannes E A Wolff; Dean Lee; Vidya Gopalakrishnan |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: European journal of cancer (Oxford, England : 1990) Volume: 46 ISSN: 1879-0852 ISO Abbreviation: Eur. J. Cancer Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-09-30 Completed Date: 2011-01-19 Revised Date: 2012-03-28 |
Medline Journal Info:
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Nlm Unique ID: 9005373 Medline TA: Eur J Cancer Country: England |
Other Details:
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Languages: eng Pagination: 2771-80 Citation Subset: IM |
Affiliation:
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Division of Pediatrics, Children’s Cancer Hospital, The University of Texas M.D. Anderson Cancer Center, Houston, TX, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Antineoplastic Agents, Phytogenic
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therapeutic use* Cell Cycle Cell Line, Tumor Cell Survival Chromatin Assembly and Disassembly / drug effects* Chromatin Immunoprecipitation DNA Topoisomerases, Type II / genetics, metabolism* DNA-Binding Proteins / genetics, metabolism* Drug Synergism Epigenomics Etoposide / therapeutic use* Histone Deacetylase Inhibitors / therapeutic use Humans Inhibitory Concentration 50 Neuroblastoma / drug therapy*, enzymology Valproic Acid / therapeutic use* |
| Grant Support | |
ID/Acronym/Agency:
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P50 CA127001-02/CA/NCI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Antineoplastic Agents, Phytogenic; 0/DNA-Binding Proteins; 0/Histone Deacetylase Inhibitors; 33419-42-0/Etoposide; 99-66-1/Valproic Acid; EC 5.99.1.3/DNA Topoisomerases, Type II; EC 5.99.1.3/DNA topoisomerase II beta |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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