TNF Inhibits SDF-1 Production and Increases Osteoclast Precursor Mobilization
Author Information
Author(s): Zhang Qian, Guo Ruolin, Schwarz Edward M, Boyce Brendan F, Xing Lianping
Primary Institution: University of Rochester Medical Center
Hypothesis
The study investigates the role of the SDF-1/CXCR4 axis in TNF-induced mobilization of osteoclast precursors from bone marrow.
Conclusion
Elevated TNF levels inhibit SDF-1 production by bone marrow stromal cells, leading to increased release of osteoclast precursors into the bloodstream.
Supporting Evidence
- TNF treatment decreased SDF-1 levels in bone marrow extracts.
- Osteoclast precursors migrated towards SDF-1 gradients.
- Bone marrow stromal cells from TNF-transgenic mice produced low levels of SDF-1.
Takeaway
When there's too much TNF in the body, it stops certain cells from making a helper protein called SDF-1, which makes it easier for bone cells to move into the blood.
Methodology
Osteoclast precursors were generated from bone marrow cells of TNF-transgenic or wild-type mice, and their migration and SDF-1 expression were assessed using various assays.
Limitations
The study did not provide a direct association between TNF-reduced SDF-1 production and OCP mobilization in vivo.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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