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ADAMTS-1 increases the three-dimensional growth of osteoblasts through type I collagen processing
Anders P Rehn1, Mark A Birch, Erik Karlström
1Center for Oral Biology, Karolinska Institute, PO Box 4064, SE-141 04 Huddinge, Sweden. anders.rehn@ki.se
Bone
|June 15, 2007
Summary
ADAMTS-1 protein, induced by parathyroid hormone (PTH), processes collagen type I in osteoblasts. This influences osteoblast growth and migration, suggesting a role in bone remodeling.
Area of Science:
- Biochemistry
- Cell Biology
- Bone Biology
Background:
- ADAMTS-1 (a disintegrin and metalloprotease with thrombospondin repeats) is induced by parathyroid hormone (PTH) in rat osteoblasts.
- Its function in bone cells, particularly in bone remodeling, remains largely uncharacterized.
Purpose of the Study:
- To investigate the function of ADAMTS-1 in human osteoblasts and its role in bone remodeling.
- To determine the effect of ADAMTS-1 on collagen processing and osteoblast behavior in vitro.
Main Methods:
- Human primary osteoblasts and osteosarcoma cells (SaOS-2) were used to study ADAMTS-1 expression and function.
- Ultrastructural immunolabeling was employed to localize ADAMTS-1 in bone tissue.
- SaOS-2 cells expressing wild-type (wtATS) or metalloprotease-dead (pmATS) ADAMTS-1 were analyzed for collagenolytic activity, cell growth, and migration.
Main Results:
- ADAMTS-1 protein is rapidly and transiently produced by human osteoblasts in response to PTH.
- ADAMTS-1 is localized near collagen fibrils in bone tissue.
- Cells expressing wtATS showed increased collagenolytic activity and enhanced 3D growth in collagen gels but reduced migration on planar surfaces.
- Western analysis revealed altered collagen type I processing and release of collagen fragments in wtATS cells.
Conclusions:
- ADAMTS-1 has the capability to process collagen type I and influences osteoblast phenotype.
- ADAMTS-1 enhances osteoblast growth in 3D collagen scaffolds while inhibiting migration on 2D substrates.
- These findings highlight ADAMTS-1 as a key player in PTH-induced bone remodeling.
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