Bone resorption by osteoclasts stimulates bone formation by osteoblasts. To isolate osteoblastic factors coupled with osteoclast activity, we performed microarray and cluster analysis of 8 tissues including bone, and found that among 10,490 genes, osteomodulin (OMD), an extracellular matrix keratan sulfate proteoglycan, was simultaneously induced with osteoclast-specific markers such as MMP9 and Acp5. OMD expression was detected in osteoblasts and upregulated during osteoblast maturation. OMD expression in osteoblasts was also detected immunohistochemically using a specific antibody against OMD. The immunoreactivity against OMD decreased in op/op mice, which lack functional macrophage colony stimulating factor (M-CSF) and are therefore defective in osteoclast formation, when compared to wild-type littermates. OMD expression in op/op mice was upregulated by M-CSF treatment. Since the M-CSF receptor c-Fms was not expressed in osteoblasts, it is likely that OMD is an osteoblast maturation marker that is induced by osteoclast activity.
|Number of pages||7|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - 2007 Oct 19|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology