Bone development requires the recruitment of osteoclast precursors from surrounding mesenchyme, thereby allowing the key events of bone growth such as marrow cavity formation, capillary invasion, and matrix remodeling. We demonstrate that mice deficient in gelatinase B/matrix metalloproteinase (MMP)-9 exhibit a delay in osteoclast recruitment. Histological analysis and specialized invasion and bone resorption models show that MMP-9 is specifically required for the invasion of osteoclasts and endothelial cells into the discontinuously mineralized hypertrophic cartilage that fills the core of the diaphysis. However, MMPs other than MMP-9 are required for the passage of the cells through unmineralized type I collagen of the nascent bone collar, and play a role in resorption of mineralized matrix. MMP-9 stimulates the solubilization of unmineralized cartilage by MMP-13, a collagenase highly expressed in hypertrophic cartilage before osteoclast invasion. Hypertrophic cartilage also expresses vascular endothelial growth factor (VEGF), which binds to extracellular matrix and is made bioavailable by MMP-9 (Bergers, G., R. Brekken, G. McMahon, T.H. Vu, T. Itoh, K. Tamaki, K. Tanzawa, P. Thorpe, S. Itohara, Z. Werb, and D. Hanahan. 2000. Nat. Cell Biol. 2:737–744). We show that VEGF is a chemoattractant for osteoclasts. Moreover, invasion of osteoclasts into the hypertrophic cartilage requires VEGF because it is inhibited by blocking VEGF function. These observations identify specific actions of MMP-9 and VEGF that are critical for early bone development.
Matrix Metalloproteinase 9 and Vascular Endothelial Growth Factor Are Essential for Osteoclast Recruitment into Developing Long Bones
M. Engsig,Qing-Jun Chen,Thiennu H. Vu,A. Pedersen,Bente Therkidsen,L. Lund,K. Henriksen,T. Lenhard,N. Foged,Z. Werb,J. Delaissé
Published 2000 in Journal of Cell Biology
ABSTRACT
PUBLICATION RECORD
- Publication year
2000
- Venue
Journal of Cell Biology
- Publication date
2000-11-13
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- developing long bones
Immature long bones undergoing marrow cavity formation, vascular invasion, and matrix remodeling.
Aliases: developing bone, long bone development
- hypertrophic cartilage
The mineralizing cartilage tissue in the growth plate region that fills the core of the developing diaphysis.
Aliases: hypertrophic cartilage core
- mmp-13
A collagenase expressed in hypertrophic cartilage and implicated here in cartilage matrix solubilization.
Aliases: matrix metalloproteinase 13
- mmp-9
A gelatinase matrix metalloproteinase studied here for its role in cell invasion during bone development.
Aliases: gelatinase B, matrix metalloproteinase 9
- osteoclast recruitment
The process by which osteoclast precursors and osteoclasts are attracted into developing bone tissues.
Aliases: osteoclast invasion
- vegf
A vascular growth factor associated here with matrix-bound signaling and chemoattraction during bone development.
Aliases: vascular endothelial growth factor
REFERENCES
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