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Expression of bone morphogenic proteins and receptors at the injured growth plate cartilage in young rats.

Authors: Ngo, TQ  Scherer, MA  Zhou, FH  Foster, BK  Xian, CJ 
Citation: Ngo TQ, etal., J Histochem Cytochem. 2006 Aug;54(8):945-54. Epub 2006 May 1.
Pubmed: (View Article at PubMed) PMID:16651391
DOI: Full-text: DOI:10.1369/jhc.6A6939.2006

The injured growth plate cartilage is often repaired by bony tissue, resulting in impaired bone growth in children. Bone morphogenic proteins (BMPs) are important for bone fracture repair, and as a step to characterize potential involvement of BMPs in bony repair of injured growth plate, expression of BMPs and receptors (BMP-R) was examined by quantitative RT-PCR and immunohistochemistry in rat injured tibial growth plate. During the inflammatory response on day 1, slightly increased expression of BMP-3, BMP-4, BMP-R1a, and BMP-R2 was observed, with immunostaining seen among inflammatory cells at the injury site. During mesenchymal infiltration and osteogenic responses on days 3-14, moderately increased expression of BMP-2, -3, -4, -7, and BMP-R1a was found, with immunostaining observed among infiltrated mesenchymal cells and differentiated osteoblasts lining bony trabeculae. During maturation phase on days 14-25, only BMP-7 was seen upregulated slightly and was localized in osteoblasts and marrow cells at the injury site. The temporospatial expression of BMPs and receptors at the injured growth plate suggests potential involvement of BMP-3 and -4 in regulating the inflammatory response or as its mediators in modulating downstream events, and BMP-2, -3, -4, and -7 in the fibrogenic and osteogenic responses, and BMP-7 in bone remodeling at the injured growth plate.

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RGD Object Information
RGD ID: 2289037
Created: 2008-01-16
Species: All species
Last Modified: 2008-01-16
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.