Abstract
Dysregulation of micro RNAs is crucially implicated in tumorigenesis. We detected downregulation of miR-100 in breast cancer cells, leading to an upregulation of the proliferation- and survival-promoting oncogene insulin-like growth factor (IGF) 2. Stable overexpression of miR-100 strongly reduced IGF2 expression and inhibited tumor growth. In invasive human breast tumors, miR-100 was reduced about fourfold as compared with benign patient samples, whereas IGF2 was strongly enhanced. MiR-100 has also been shown to suppress other proteins of the IGF/mammalian target of rapamycin (mTOR) signaling cascade in different human tumors. Our results reveal miR-100 as a context-dependent master regulator of the IGF/mTOR pathway and a potential target for therapeutic approaches.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Blotting, Northern
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Blotting, Western
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Breast Neoplasms / genetics*
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Breast Neoplasms / metabolism
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Breast Neoplasms / pathology
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Cell Line, Tumor
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Cell Proliferation*
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Cell Survival / physiology
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Cell Transformation, Neoplastic / genetics*
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Cell Transformation, Neoplastic / metabolism
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Female
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Gene Expression Regulation, Neoplastic / genetics*
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Humans
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Insulin-Like Growth Factor II / genetics
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Insulin-Like Growth Factor II / metabolism*
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Mice
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MicroRNAs / genetics*
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MicroRNAs / metabolism
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Mutagenesis, Site-Directed
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Polymerase Chain Reaction
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Signal Transduction / physiology*
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TOR Serine-Threonine Kinases / metabolism
Substances
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IGF2 protein, human
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MIRN100 microRNA, human
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MicroRNAs
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Insulin-Like Growth Factor II
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MTOR protein, human
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TOR Serine-Threonine Kinases