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dc.contributor.authorDibra, H. K.
dc.contributor.authorBrown, J. E.
dc.contributor.authorHooley, Paul
dc.contributor.authorNicholl, I. D.
dc.date.accessioned2010-12-03T16:04:31Z
dc.date.available2010-12-03T16:04:31Z
dc.date.issued2010
dc.identifier.citationOncology reports, 24 (1):37-46
dc.identifier.issn1791-2431
dc.identifier.pmid20514442
dc.identifier.doi10.3892/or_00000826
dc.identifier.urihttp://hdl.handle.net/2436/117148
dc.description.abstractRegular aspirin intake is associated with a reduction in the incidence of colorectal cancer. Aspirin has been shown to be cytotoxic to colorectal cancer cells in vitro. The molecular basis for this cytotoxicity is controversial, with a number of competing hypotheses in circulation. One suggestion is that the protective effect is related to the induction of expression of the DNA mismatch repair (MMR) proteins hMLH1, hMSH2, hMSH6 and hPMS2 in DNA MMR proficient cells. We report that treatment of the DNA MMR competent/p53 mutant colorectal cancer cell line SW480 with 1 mM aspirin for 48 h caused changes in mRNA expression of several key genes involved in DNA damage signalling pathways, including a significant down-regulation in transcription of the genes ATR, BRCA1 and MAPK12. Increases in the transcription of XRCC3 and GADD45alpha genes are also reported. Regulation of these genes could potentially have profound effects on colorectal cancer cells and may play a role in the observed chemo-protective effect of aspirin in vivo. Although a correlation was not seen between transcript and protein levels of ATR, BRCA1 and GADD45alpha, an increase in XRCC3 encoded protein expression upon aspirin treatment in SW480 cells was observed by immunoblotting, immunofluorescence and immunohistochemical analysis. This is the first report of XRCC3 gene transcription and encoded protein expression being susceptible to exposure to the non-steroidal anti-inflammatory drug, aspirin. Furthermore, this study indicates that alterations in gene transcription seen in microarray studies must be verified at the protein level.
dc.language.isoen
dc.publisherSpandios Publications
dc.subject.meshAnti-Inflammatory Agents, Non-Steroidal
dc.subject.meshAspirin
dc.subject.meshCarcinoma
dc.subject.meshCell Line, Tumor
dc.subject.meshCell Survival
dc.subject.meshColorectal Neoplasms
dc.subject.meshDNA Repair
dc.subject.meshDose-Response Relationship, Drug
dc.subject.meshGene Expression Profiling
dc.subject.meshGene Expression Regulation, Neoplastic
dc.subject.meshHumans
dc.subject.meshNeoplasm Proteins
dc.subject.meshOligonucleotide Array Sequence Analysis
dc.titleAspirin and alterations in DNA repair proteins in the SW480 colorectal cancer cell line.
dc.typeJournal article
dc.identifier.journalOncology reports
html.description.abstractRegular aspirin intake is associated with a reduction in the incidence of colorectal cancer. Aspirin has been shown to be cytotoxic to colorectal cancer cells in vitro. The molecular basis for this cytotoxicity is controversial, with a number of competing hypotheses in circulation. One suggestion is that the protective effect is related to the induction of expression of the DNA mismatch repair (MMR) proteins hMLH1, hMSH2, hMSH6 and hPMS2 in DNA MMR proficient cells. We report that treatment of the DNA MMR competent/p53 mutant colorectal cancer cell line SW480 with 1 mM aspirin for 48 h caused changes in mRNA expression of several key genes involved in DNA damage signalling pathways, including a significant down-regulation in transcription of the genes ATR, BRCA1 and MAPK12. Increases in the transcription of XRCC3 and GADD45alpha genes are also reported. Regulation of these genes could potentially have profound effects on colorectal cancer cells and may play a role in the observed chemo-protective effect of aspirin in vivo. Although a correlation was not seen between transcript and protein levels of ATR, BRCA1 and GADD45alpha, an increase in XRCC3 encoded protein expression upon aspirin treatment in SW480 cells was observed by immunoblotting, immunofluorescence and immunohistochemical analysis. This is the first report of XRCC3 gene transcription and encoded protein expression being susceptible to exposure to the non-steroidal anti-inflammatory drug, aspirin. Furthermore, this study indicates that alterations in gene transcription seen in microarray studies must be verified at the protein level.


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