Overexpression of Runx2 directed by the matrix metalloproteinase-13 promoter containing the AP-1 and Runx/RD/Cbfa sites alters bone remodeling in vivo.

Journal of Cellular Biochemistry
Nagarajan SelvamuruganNicola C Partridge

Abstract

The activator protein-1 (AP-1) and runt domain binding (Runx/RD/Cbfa) sites and their respective binding proteins, c-Fos/c-Jun and Runx2 (Cbfa1), regulate the rat matrix metalloproteinase-13 (MMP-13) promoter in both parathyroid hormone (PTH)-treated and differentiating osteoblastic cells in culture. To determine the importance of these regulatory sites in the expression of MMP-13 in vivo, transgenic mice containing either wild-type (-456 or -148) or AP-1 and Runx/RD/Cbfa sites mutated (-148A3R3) MMP-13 promoters fused with the E. coli lacZ reporter were generated. The wild-type transgenic lines expressed higher levels of bacterial beta-galactosidase in bone, teeth, and skin compared to the mutant and non-transgenic lines. Next, we investigated if overexpression of Runx2 directed by the MMP-13 promoter regulated expression of bone specific genes in vivo, and whether this causes morphological changes in these animals. Real time RT-PCR experiments identified increased mRNA expression of bone forming genes and decreased MMP-13 in the tibiae of transgenic mice (14 days and 6 weeks old). Histomorphometric analyses of the proximal tibiae showed increased bone mineralization surface, mineral apposition rate, and bone formation rate in...Continue Reading

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Citations

Feb 25, 2014·International Journal of Biological Macromolecules·S Vimalraj, N Selvamurugan
Nov 16, 2012·Tissue Engineering. Part B, Reviews·Tong Ming Liu, Eng Hin Lee
Apr 5, 2011·Biochemistry Research International·Isabella W Y MakMichelle Ghert
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