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Osteocytes under Mechanical Loading Regulate PC-3 Cancer Cell-Mineral Interactions during Early-Stage Metastasis to
Kimberly Seaman1, Bryan Guo2, William W Du3
1Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, M5S 3G8, Canada.
Advanced Biology
|November 12, 2025
Summary
Mechanical loading of osteocytes inhibits early prostate cancer bone metastasis. This study shows flow-stimulated osteocytes reduce cancer cell growth and migration, preserving bone structure.
Area of Science:
- Bone biology
- Cancer metastasis
- Mechanobiology
Background:
- Bone metastasis is a major complication in advanced prostate cancer.
- Osteocytes, bone cells, are key regulators of bone homeostasis and are implicated in metastasis.
- Conflicting in vitro and in vivo data exist regarding exercise, osteocytes, and prostate cancer progression.
Purpose of the Study:
- To investigate the role of mechanically stimulated osteocytes in early prostate cancer bone metastasis.
- To examine osteocyte-osteoblast interactions in the bone microenvironment under mechanical stress.
- To reconcile conflicting findings on exercise and prostate cancer bone metastasis.
Main Methods:
- Utilized a microfluidic co-culture assay with osteoblasts and osteocytes (MLO-Y4 and primary).
- Applied mechanical stimulation (flow) to osteocytes.
- Assessed the effect of conditioned media from stimulated osteocytes on PC-3 prostate cancer cells (migration, invasion, growth, morphology, matrix mineralization).
Main Results:
- Conditioned media from flow-stimulated osteocytes inhibited PC-3 cell migration and invasion.
- Osteoblast-conditioned media from stimulated osteocytes suppressed PC-3 cancer cell growth and altered morphology.
- Mineralized matrix was preserved in co-culture assays with stimulated osteocyte-conditioned media.
Conclusions:
- Mechanical loading of osteocytes inhibits early-stage prostate cancer metastasis on the endosteal surface.
- Mechanically stimulated osteocytes play a protective role against prostate cancer bone metastasis.
- Findings support the potential of targeting osteocyte mechanosensing for cancer therapy.
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