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An FGF signaling loop sustains the generation of differentiated progeny from stem cells in mouse incisors
- Source :
- Development (Cambridge, England). 135(2)
- Publication Year :
- 2007
-
Abstract
- Rodent incisors grow throughout adult life, but are prevented from becoming excessively long by constant abrasion, which is facilitated by the absence of enamel on one side of the incisor. Here we report that loss-of-function of sprouty genes, which encode antagonists of receptor tyrosine kinase signaling,leads to bilateral enamel deposition, thus impeding incisor abrasion and resulting in unchecked tooth elongation. We demonstrate that sprouty genes function to ensure that enamel-producing ameloblasts are generated on only one side of the tooth by inhibiting the formation of ectopic ameloblasts from self-renewing stem cells, and that they do so by preventing the establishment of an epithelial-mesenchymal FGF signaling loop. Interestingly, although inactivation of Spry4 alone initiates ectopic ameloblast formation in the embryo, the dosage of another sprouty gene must also be reduced to sustain it after birth. These data reveal that the generation of differentiated progeny from a particular stem cell population can be differently regulated in the embryo and adult.
- Subjects :
- medicine.medical_specialty
Mesoderm
Cellular differentiation
Gene Dosage
Cervical loop
Nerve Tissue Proteins
Biology
Protein Serine-Threonine Kinases
Fibroblast growth factor
Models, Biological
Receptor tyrosine kinase
Epithelium
Article
Mice
stomatognathic system
Internal medicine
medicine
Ameloblasts
Animals
Hedgehog Proteins
Dental Enamel
Molecular Biology
Adaptor Proteins, Signal Transducing
Cell Proliferation
Stem Cells
Intracellular Signaling Peptides and Proteins
Gene Expression Regulation, Developmental
Membrane Proteins
Cell Differentiation
Cell biology
Up-Regulation
Fibroblast Growth Factors
Incisor
stomatognathic diseases
Endocrinology
medicine.anatomical_structure
Phenotype
Organ Specificity
biology.protein
Signal transduction
Stem cell
Ameloblast
Developmental Biology
Signal Transduction
Subjects
Details
- ISSN :
- 09501991
- Volume :
- 135
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Development (Cambridge, England)
- Accession number :
- edsair.doi.dedup.....ed44b32b899f67492e04a7c9c5d0c816