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Updated: May 22, 2026
06:17
Osteoclast Derivation from Mouse Bone Marrow
Published on: November 6, 2014
Bone matrix osteonectin limits prostate cancer cell growth and survival
Kristina Kapinas1, Katie M Lowther, Catherine B Kessler
1Center for Molecular Medicine, University of Connecticut Health Center, 263 Farmington Ave, Farmington, CT 06030, USA.
Summary
Osteonectin, a bone protein, suppresses prostate cancer progression in bone metastases. It alters cancer cell behavior, reducing proliferation and radiation resistance within the bone microenvironment.
Area of Science:
- Oncology
- Biochemistry
- Biomaterials
Background:
- Prostate cancer frequently metastasizes to bone, interacting with the bone microenvironment.
- Osteonectin (SPARC/BM-40), a bone-enriched matricellular protein, is upregulated in prostate cancer bone metastases.
- Osteonectin's role in prostate cancer pathogenesis within the bone microenvironment is complex and requires further investigation.
Purpose of the Study:
- To investigate the effect of bone matrix osteonectin on prostate cancer cell behavior in vitro.
- To model prostate cancer cell-bone interactions using mineralized matrices with and without osteonectin.
Main Methods:
- Utilized the human prostate cancer cell line PC-3 and mineralized matrices synthesized by wild type and osteonectin-null osteoblasts.
- Employed second harmonic generation imaging to analyze collagen fiber organization in the matrices.
- Assessed PC-3 cell proliferation, spreading, and radiation resistance on different matrices.
Main Results:
- Wild type matrices exhibited thick, longitudinally bundled collagen fibers, while osteonectin-null matrices had thinner, randomly networked fibers.
- Prostate cancer cells grown on wild type matrices showed decreased proliferation and radiation resistance, but increased spreading, compared to cells on osteonectin-null matrices.
- The collagen fiber phenotype observed in vitro mirrored that of a mouse model of prostate cancer bone metastasis.
Conclusions:
- Bone matrix osteonectin can suppress prostate cancer pathogenesis.
- Osteonectin influences prostate cancer cell behavior, including proliferation and response to therapy, within the skeletal metastatic microenvironment.
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