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Elevated expression of axin2 and hnkd mRNA provides evidence that Wnt/β-catenin signaling is activated in human colon tumors
- Source :
- Proceedings of the National Academy of Sciences. 98:14973-14978
- Publication Year :
- 2001
- Publisher :
- Proceedings of the National Academy of Sciences, 2001.
-
Abstract
- Genetic studies have identified mutations in key regulators of the Wnt/β-catenin pathway in a variety of cancers, most frequently in colon cancers. However, whether the pathway is activated in clinical cancer samples is not easily determined, and therefore it is useful to find markers that could be surrogates to show activation of the Wnt/β-catenin pathway. Gene expression profiles were analyzed in SW620, a colon cancer cell line in which β-catenin levels are stabilized as a consequence of truncated adenomatous polyposis coli and were compared with profiles of the same cells transfected with antisense oligodeoxynucleotides. Treatment of cells with β-catenin antisense oligodeoxynucleotides resulted in a decrease in the levels of axin2 and human naked cuticle ( hnkd ) mRNAs. Interestingly, the proteins encoded by both of these mRNAs are known inhibitors of the β-catenin pathway. In 30 human cell lines derived from different origins, axin2 and hnkd were expressed only in human colon cancer cell lines that are known to have activating mutations in the Wnt/β-catenin pathway. Further, levels of both axin2 and hnkd mRNA were also found to be elevated in about 65% of laser microdissected cells from human colon tumors compared with laser microdissected cells of normal morphology from the same patient samples. The increased expression of axin2 and hnkd correlated with truncations in adenomatous polyposis coli in the same patient samples. These results reveal that it is possible to detect activation of a carcinogenic pathway in human cancer samples with specific markers.
- Subjects :
- DNA, Complementary
Beta-catenin
Adenomatous polyposis coli
Molecular Sequence Data
Biology
Cell Line
Axin Protein
Proto-Oncogene Proteins
medicine
AXIN2
Humans
RNA, Messenger
Promoter Regions, Genetic
beta Catenin
DNA Primers
Oligonucleotide Array Sequence Analysis
Multidisciplinary
Base Sequence
Wnt signaling pathway
Proteins
Cancer
Transfection
Zebrafish Proteins
Biological Sciences
medicine.disease
Molecular biology
Repressor Proteins
Wnt Proteins
Naked cuticle
Cytoskeletal Proteins
Cell culture
Colonic Neoplasms
Trans-Activators
biology.protein
Signal Transduction
Subjects
Details
- ISSN :
- 10916490 and 00278424
- Volume :
- 98
- Database :
- OpenAIRE
- Journal :
- Proceedings of the National Academy of Sciences
- Accession number :
- edsair.doi.dedup.....189a8ea62786a3242967306ec5c7342b