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ID 106
file
creator
Komori, Toshihisa
subject
Runx2
chondrocyte differentiation
osteoblast differentiation
Runx3
Cbfb
NDC
Medical sciences
abstract
Runx2 is a transcription factor that belongs to Runx family (Runx1, Runx2, and Runx3). Runx2 interacts with many other transcription factors and co-regulators in the transcriptional regulation of its target genes. Cbfb is one of the co-regulators, forms heterodimers with Runx2, and is required for Runx2-dependent transcriptional regulation. Runx2 is essential for the commitment of multipotent mesenchymal cells into the osteoblastic lineage, because Runx2-deficient mice show complete lack of bone formation due to the absence of osteoblasts. Further, Runx2 inhibits adipocyte differentiation, because Runx2-deficient calvarial cells spontaneously differentiate into adipocytes. Overexpression of Runx2 in osteoblasts inhibits osteoblast maturation but decreased the expression of major bone matrix protein genes. Therefore, Runx2 triggers the gene expression of bone matrix proteins, while keeping the osteoblastic cells in an immature stage. Moreover, Runx2 strongly inhibits the transition of osteoblasts into osteocytes. Runx2 and Runx3 double knockout mice showed that Runx2 and Runx3 have redundant functions in chondrocytes, and that they are essential for chondrocyte maturation. Runx2 directly induces Ihh expression and coordinates the proliferation and differentiation of chondrocytes. Therefore, Runx2 regulates bone formation by regulating osteoblast differentiation as well as chondrocyte maturation.
journal title
Hiroshima Conference on Education and Science in Dentistry, 2006 : the 40th Anniversary of Hiroshima University Faculty of Dentistry
start page
133
end page
136
date of issued
2006-01-08
language
eng
nii type
Conference Paper
HU type
Conference Papers
DCMI type
text
format
application/pdf
text version
publisher
relation is part of URL
http://ir.lib.hiroshima-u.ac.jp/00014842
department
Graduate School of Biomedical Science