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Published on: March 18, 2019
A role for cell-surface CSF-1 in osteoblast-mediated osteoclastogenesis
1Section of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut 06520, USA.
Calcified Tissue International
|May 11, 2002
Summary
Membrane-bound CSF-1 (mCSF-1) from osteoblasts is crucial for osteoclast formation. Both membrane-bound and soluble CSF-1 (sCSF-1) are synergistic in stimulating osteoclastogenesis in the bone microenvironment.
Area of Science:
- Bone Biology
- Cell Signaling
- Skeletal Homeostasis
Background:
- Osteoclast formation is essential for bone remodeling.
- Osteoblasts play a key role in regulating osteoclastogenesis.
- The specific roles of different forms of CSF-1 in this process are not fully understood.
Purpose of the Study:
- To investigate the distinct contributions of soluble CSF-1 (sCSF-1) and membrane-bound CSF-1 (mCSF-1) produced by osteoblasts to osteoclast formation.
- To elucidate the mechanism of osteoblast-mediated osteoclastogenesis.
Main Methods:
- Co-culture of murine bone marrow progenitors with primary murine osteoblasts or osteoblasts from op/op mice.
- Utilizing glutaraldehyde-fixed osteoblasts as a source of mCSF-1.
- Employing CSF-1 antibody pretreatment and antisense oligonucleotides to block mCSF-1 activity.
- Assessing osteoclast-like cell (OCL) formation.
Main Results:
- Osteoclast-like cell formation was observed when using fixed osteoblasts as an mCSF-1 source.
- Blocking mCSF-1 with antibodies or antisense oligonucleotides significantly inhibited OCL formation.
- Osteoclast formation was also inhibited when using osteoblasts deficient in CSF-1 (op/op mice).
- Both mCSF-1 and sCSF-1 demonstrated synergistic effects on OCL formation.
Conclusions:
- Membrane-bound CSF-1 (mCSF-1) plays a critical role in osteoblast-mediated osteoclastogenesis.
- mCSF-1 is a key factor in the bone microenvironment regulating osteoclast formation.
- The combined action of mCSF-1 and sCSF-1 is synergistic for stimulating osteoclastogenesis.
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