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Cancer Cell International
Published in: Cancer Cell International 1/2006

Open Access 01-12-2006 | Primary research

Coordinate regulation of fibronectin matrix assembly by the plasminogen activator system and vitronectin in human osteosarcoma cells

Authors: Daniel Vial, Elizabeth Monaghan-Benson, Paula J McKeown-Longo

Published in: Cancer Cell International | Issue 1/2006

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Abstract

Background

Plasminogen activators are known to play a key role in the remodeling of bone matrix which occurs during tumor progression, bone metastasis and bone growth. Dysfunctional remodeling of bone matrix gives rise to the osteoblastic and osteolytic lesions seen in association with metastatic cancers. The molecular mechanisms responsible for the development of these lesions are not well understood. Studies were undertaken to address the role of the plasminogen activator system in the regulation of fibronectin matrix assembly in the osteoblast-like cell line, MG-63.

Results

Treatment of MG-63 cells with P25, a peptide ligand for uPAR, resulted in an increase in assembly of fibronectin matrix which was associated with an increase in the number of activated β1 integrins on the cell surface. Overexpression of uPAR in MG-63 cells increased the effect of P25 on fibronectin matrix assembly and β1 integrin activation. P25 had no effect on uPAR null fibroblasts, confirming a role for uPAR in this process. The addition of plasminogen activator inhibitor Type I (PAI-1) to cells increased the P25-induced fibronectin polymerization, as well as the number of activated integrins. This positive regulation of PAI-1 on fibronectin assembly was independent of PAI-1's anti-proteinase activity, but acted through PAI-1 binding to the somatomedin B domain of vitronectin.

Conclusion

These results indicate that vitronectin modulates fibronectin matrix assembly in osteosarcoma cells through a novel mechanism involving cross-talk through the plasminogen activator system.
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Metadata
Title
Coordinate regulation of fibronectin matrix assembly by the plasminogen activator system and vitronectin in human osteosarcoma cells
Authors
Daniel Vial
Elizabeth Monaghan-Benson
Paula J McKeown-Longo
Publication date
01-12-2006
Publisher
BioMed Central
Published in
Cancer Cell International / Issue 1/2006
Electronic ISSN: 1475-2867
DOI
https://doi.org/10.1186/1475-2867-6-8

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