Small Interfering RNAs Directed against β-Catenin Inhibit the in Vitro and in Vivo Growth of Colon Cancer Cells

• Published in: Clinical cancer research Vol. 9; no. 4; pp. 1291 - 1300
• Main Authors: VERMA, Udit N, SURABHI, Rama M, SCHMALTIEG, Aurelia, BECERRA, Carlos, GAYNOR, Richard B
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA American Association for Cancer Research 01-04-2003
• Subjects: Adenomatous Polyposis Coli Protein - metabolism; Animals; beta Catenin; Biological and medical sciences; Blotting, Western; Caspase 3; Caspases - metabolism; Cell Division; Cell Line, Tumor; Colonic Neoplasms - metabolism; Colonic Neoplasms - therapy; Cytoskeletal Proteins - antagonists & inhibitors; Gastroenterology. Liver. Pancreas. Abdomen; Humans; Medical sciences; Mice; Mice, Nude; Microscopy, Fluorescence; Mutation; Neoplasm Transplantation; Oligonucleotides - metabolism; RNA - metabolism; RNA, Small Interfering - metabolism; Stomach. Duodenum. Small intestine. Colon. Rectum. Anus; Time Factors; Trans-Activators - antagonists & inhibitors; Transfection; Tumors; RNA; Rodentia; Malignant tumor; In vitro; Colonic disease; In vivo; Vertebrata; Mammalia; Mouse; Animal; Digestive diseases; Intestinal disease; Colon; Catenin
• ISSN: 1078-0432; 1557-3265

The β-catenin and APC genes are key components of the Wnt signaling pathway. Mutation of these genes results in increased levels of the β-catenin
protein, which is associated with enhanced cellular proliferation and the development of both colon polyps and colon cancer.
Recently, a technique known as RNA interference has been successfully adapted to mammalian cells so that it is now possible
to specifically decrease the expression of cellular genes after transfection of annealed small interfering 21-mer RNAs. In
the current study, we used small interfering RNA (siRNA) directed against β-catenin to determine the effects of decreasing
the high constitutive levels of this protein in colon cancer cell lines with mutations in either β-catenin or APC. Our studies
demonstrate that siRNA directed against β-catenin markedly decreased β-catenin-dependent gene expression and inhibited cellular
proliferation as reflected in the reduced growth of these colon cancer cells both in soft agar and in nude mice. These results
indicate that siRNA can target specific factors whose expression is altered in malignancy and may have the potential as a
therapeutic modality to treat human cancer.