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Träfflista för sökning "L773:0250 7005 OR L773:1791 7530 ;srt2:(2000-2004);pers:(Hugander A)"

Sökning: L773:0250 7005 OR L773:1791 7530 > (2000-2004) > Hugander A

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  • Dimberg, Jan, et al. (författare)
  • Enhanced expression of cyclooxygenase-2 and nuclear beta-catenin are related to mutations in the APC gene in human colorectal cancer
  • 2001
  • Ingår i: Anticancer Research. - 0250-7005 .- 1791-7530. ; 21:2A, s. 911-915
  • Tidskriftsartikel (refereegranskat)abstract
    • Mutational 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, hut 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 pathway.
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