Abstract
Hyperproliferation of the premalignant epithelium is critical for colonic carcinogenesis; however the mechanisms remain largely unexplored. We report herein that prior to occurrence of neoplastic lesions in the azoxymethane-rat model of colon carcinogenesis; the tumor suppressor gene C-terminal Src kinase (Csk) was down-regulated with a concomitant increase in Src activity. Furthermore, pharmacological or genetic (RNA interference) inhibition of Csk resulted in increased proliferation in colon cancer cell lines through the mitogen-activated protein kinase dependent pathway. Thus, we demonstrate, for the first time, that Csk suppression is an important early event in colorectal cancer pathogenesis.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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CSK Tyrosine-Protein Kinase
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Cell Proliferation
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Cell Transformation, Neoplastic*
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Colon / pathology
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Colonic Neoplasms / enzymology*
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Colonic Neoplasms / genetics
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Down-Regulation*
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Genes, Tumor Suppressor*
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HT29 Cells
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Humans
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Intestinal Mucosa / immunology
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Intestinal Mucosa / pathology*
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MAP Kinase Kinase 1 / antagonists & inhibitors
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MAP Kinase Kinase 2 / antagonists & inhibitors
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Male
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Precancerous Conditions / enzymology*
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Precancerous Conditions / pathology
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Protein Kinase Inhibitors / pharmacology
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Protein-Tyrosine Kinases / analysis
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Protein-Tyrosine Kinases / antagonists & inhibitors
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Protein-Tyrosine Kinases / genetics*
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RNA Interference
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Rats
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Rats, Inbred F344
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src-Family Kinases
Substances
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Protein Kinase Inhibitors
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Protein-Tyrosine Kinases
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CSK Tyrosine-Protein Kinase
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src-Family Kinases
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CSK protein, human
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MAP Kinase Kinase 1
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MAP Kinase Kinase 2