Mechanical Stimulation Modulates Osteocyte Regulation of Cancer Cell Phenotype.

Area of Science:

• Biomedical Engineering
• Cancer Biology
• Mechanobiology

Background:

• Breast and prostate cancers frequently metastasize to bone.
• Bone metastasis involves interactions between tumor cells and the bone microenvironment.
• Osteocytes, key bone cells, regulate bone remodeling and respond to mechanical stimuli.

Purpose of the Study:

• To investigate the impact of osteocyte mechanical stimulation on breast and prostate cancer cell behavior.
• To understand how mechanical loading of osteocytes influences cancer cell proliferation, invasion, and migration.
• To develop and utilize advanced in vitro models for studying bone metastasis.

Main Methods:

• Culturing osteocyte-like cells (MLO-Y4) and exposing them to fluid shear stress.
• Treating breast (MDA-MB-231, MCF-7) and prostate (PC-3, LNCaP) cancer cell lines with conditioned media from stimulated osteocytes.
• Developing and using a microfluidic organ-chip model to simulate the bone microenvironment and mechanical loading.

Main Results:

• Osteocyte paracrine signaling, without mechanical stimulation, inhibited breast and prostate cancer cell proliferation and invasion while increasing migration.
• Mechanical stimulation of osteocytes reversed these inhibitory effects in breast cancer cells.
• The microfluidic model showed that mechanical stimulation of osteocytes increased breast and prostate cancer cell invasion.

Conclusions:

• Osteocyte mechanical loading plays a critical role in regulating cancer cell behavior during bone metastasis.
• Mechanical stimulation can promote cancer cell invasion, contradicting initial inhibitory signaling.
• Advanced in vitro models, like organ-chips, are essential for accurately predicting bone metastasis dynamics.