PubMed:11396184 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/11396184","sourcedb":"PubMed","sourceid":"11396184","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/11396184","text":"Enhanced expression of cyclooxygenase-2 and nuclear beta-catenin are related to mutations in the APC gene in human colorectal cancer.\nMutational inactivation of the human tumour suppressor gene adenomatous polyposis coli (APC) results in constitutive activation of beta-catenin/T cell factor-4 (Tcf-4) mediated transcription of target genes. Up-regulation of cyclooxygenase-2 (COX-2) protein is frequently found in human colorectal cancer (CRC). We analysed 38 CRC for mutations in APC and beta-catenin and found an association between APC mutations and elevated COX-2 levels. Furthermore, APC mutations were predominantly observed in tumour tissues from the rectum compared to tumours of colonic origin. Western blot analysis revealed that nuclear beta-catenin levels were generally higher in tumours with APC mutations compared to tumours with wild type APC. However, there was also a higher level of nuclear beta-catenin in tumour compared to normal tissue, but nuclear Tcf-4 protein was constitutively expressed in tumour and normal tissue and showed no differences. An identified putative Tcf-4 binding element in the COX-2 promoter may partly explain the enhanced level of COX-2 and support the idea that COX-2 may be a downstream target of the APC/beta-catenin/Tcf-4 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