Abstract
The induction of developmental structures derived from the ectoderm, such as the neural tube or tooth, occurs through neutralization of the inhibitory activity of members of the bone-morphogenetic protein (BMP) family by BMP antagonists. Here we show that, during hair-follicle development, the neural inducer and BMP-neutralizing protein Noggin is expressed in the follicular mesenchyme, that noggin-knockout mice show significant retardation of hair-follicle induction, and that Noggin neutralizes the inhibitory action of BMP-4 and stimulates hair-follicle induction in embryonic skin organ culture. As a crucial mesenchymal signal that stimulates hair-follicle induction, Noggin operates through antagonistic interactions with BMP-4, which result in upregulation of the transcription factor Lef-1 and the cell-adhesion molecule NCAM, as well as through BMP4-independent downregulation of the 75 kD neurotrophin receptor in the developing hair follicle.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Bone Morphogenetic Protein 2
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Bone Morphogenetic Protein 4
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Bone Morphogenetic Protein Receptors
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Bone Morphogenetic Proteins / genetics
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Carrier Proteins
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Cell Adhesion Molecules / genetics
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Gene Expression Regulation, Developmental*
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Hair Follicle / embryology*
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Heterozygote
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Keratins / genetics
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Mesoderm / physiology*
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Mice
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Mice, Knockout
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Morphogenesis
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Organ Culture Techniques
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Proteins / genetics
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Proteins / physiology*
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Receptors, Cell Surface / genetics
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Receptors, Growth Factor*
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Skin / cytology
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Skin / embryology
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Skin / metabolism
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Transcription Factors / genetics
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Transforming Growth Factor beta*
Substances
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Bmp2 protein, mouse
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Bmp4 protein, mouse
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Bone Morphogenetic Protein 2
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Bone Morphogenetic Protein 4
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Bone Morphogenetic Proteins
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Carrier Proteins
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Cell Adhesion Molecules
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Proteins
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Receptors, Cell Surface
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Receptors, Growth Factor
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Transcription Factors
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Transforming Growth Factor beta
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noggin protein
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Keratins
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Bone Morphogenetic Protein Receptors