Abstract
Basal-like breast cancers (BLBC) express a luminal progenitor gene signature. Notch receptor signaling promotes luminal cell fate specification in the mammary gland, while suppressing stem cell self-renewal. Here we show that deletion of Lfng, a sugar transferase that prevents Notch activation by Jagged ligands, enhances stem/progenitor cell proliferation. Mammary-specific deletion of Lfng induces basal-like and claudin-low tumors with accumulation of Notch intracellular domain fragments, increased expression of proliferation-associated Notch targets, amplification of the Met/Caveolin locus, and elevated Met and Igf-1R signaling. Human BL breast tumors, commonly associated with JAGGED expression, elevated MET signaling, and CAVEOLIN accumulation, express low levels of LFNG. Thus, reduced LFNG expression facilitates JAG/NOTCH luminal progenitor signaling and cooperates with MET/CAVEOLIN basal-type signaling to promote BLBC.
Copyright © 2012 Elsevier Inc. All rights reserved.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Breast Neoplasms / enzymology*
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Breast Neoplasms / genetics
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Breast Neoplasms / pathology
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Calcium-Binding Proteins / metabolism
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Caveolins / genetics
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Caveolins / metabolism*
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Cell Proliferation
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Cell Transformation, Neoplastic / genetics
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Cell Transformation, Neoplastic / metabolism*
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Cell Transformation, Neoplastic / pathology
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Cells, Cultured
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Claudins / metabolism
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Databases, Genetic
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Female
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Gene Expression Profiling / methods
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Gene Expression Regulation, Developmental
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Gene Expression Regulation, Neoplastic
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Glycosyltransferases / deficiency
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Glycosyltransferases / genetics
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Glycosyltransferases / metabolism*
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Humans
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Immunohistochemistry
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Intercellular Signaling Peptides and Proteins / metabolism
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Jagged-1 Protein
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Mammary Glands, Animal / enzymology*
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Mammary Glands, Animal / growth & development
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Mammary Glands, Animal / pathology
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Mammary Glands, Animal / transplantation
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Mammary Neoplasms, Experimental / enzymology*
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Mammary Neoplasms, Experimental / genetics
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Mammary Neoplasms, Experimental / pathology
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Membrane Proteins / metabolism
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Mice
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Mice, Knockout
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Middle Aged
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Neoplastic Stem Cells / enzymology*
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Neoplastic Stem Cells / pathology
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Neoplastic Stem Cells / transplantation
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Oligonucleotide Array Sequence Analysis
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Proto-Oncogene Proteins c-met / genetics
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Proto-Oncogene Proteins c-met / metabolism*
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Receptor, IGF Type 1 / metabolism
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Receptors, Notch / metabolism
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Serrate-Jagged Proteins
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Signal Transduction
Substances
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Calcium-Binding Proteins
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Caveolins
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Claudins
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Intercellular Signaling Peptides and Proteins
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JAG1 protein, human
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Jag1 protein, mouse
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Jagged-1 Protein
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Membrane Proteins
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Receptors, Notch
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Serrate-Jagged Proteins
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Glycosyltransferases
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LFNG protein, human
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Lfng protein, mouse
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MET protein, human
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Proto-Oncogene Proteins c-met
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Receptor, IGF Type 1
Associated data
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GEO/GSE28712
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GEO/GSE35855