RGD Reference Report - Facial development and type III collagen RNA expression: concurrent repression in the osteopetrotic (Toothless,tl) rat and rescue after treatment with colony-stimulating factor-1.

General

Facial development and type III collagen RNA expression: concurrent repression in the osteopetrotic (Toothless,tl) rat and rescue after treatment with colony-stimulating factor-1.
Authors:	Marks SC, JR Lundmark, C Wurtz, T Odgren, PR MacKay, CA Mason-Savas, A Popoff, SN
Citation:	Marks SC Jr, etal., Dev Dyn 1999 Jun;215(2):117-25.
RGD ID:	704391
Pubmed:	PMID:10373016 (View Abstract at PubMed)
DOI:	DOI:10.1002/(SICI)1097-0177(199906)215:2<117::AID-DVDY4>3.0.CO;2-D (Journal Full-text)
The toothless (osteopetrotic) mutation in the rat is characterized by retarded development of the anterior facial skeleton. Growth of the anterior face in rats occurs at the premaxillary-maxillary suture (PMMS). To identify potential mechanisms for stunted facial growth in this mutation we compared the temporospatial expression of collagen I (Col I) and collagen III (Col III) RNA around this suture in toothless (tl) rats and normal littermates by in situ hybridization of specific riboprobes in sagittal sections of the head. In normal rats, the suture is S shaped at birth and becomes highly convoluted by 10 days with cells in the center (fibroblasts and osteoblast progenitors) expressing Col III RNA and those at the periphery (osteoblasts) expressing no Col III RNA but high amounts of Col I RNA throughout the growth phase (the first 2 postnatal weeks). In the mutant PMMS, cells were reduced in number, less differentiated, and fewer osteoblasts were encountered. Expression of Col I RNA was at normal levels, but centrosutural cells expressed Col III RNA only after day 6 and then only weakly. A highly convoluted sutural shape was never achieved in mutants during the first 2 postnatal weeks. Treatment of tl rats with the cytokine CSF-1 improved facial growth and restored cellular diversity and Col III RNA expression in the PMMS to normal levels. Taken together, these data suggest that normal facial growth in rats is related to expression of Col III RNAby osteoblast precursors in the PMMS, that these cells are deficient in the tl mutation and are rescued following treatment with CSF-1.

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Term	Qualifier	Evidence	With	Reference	Notes	Source	Original Reference(s)
Maxillofacial Abnormalities		IDA		704391		RGD

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Biological Process

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Term	Qualifier	Evidence	With	Reference	Notes	Source	Original Reference(s)
skeletal system development		IEP		704391		RGD

Objects Annotated

Genes (Rattus norvegicus)

Col3a1 (collagen type III alpha 1 chain)

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Facial development and type III collagen RNA expression: concurrent repression in the osteopetrotic (Toothless,tl) rat and rescue after treatment with colony-stimulating factor-1.