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Co-stimulation with equibiaxial strain and pre-osteoblast co-culture differentiates monocytes in a bone model
Maria R Ward Rashidi1, Catherine S Snyder1, Kathleen M Burkhard2
1Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109 USA.
MRS Communications
|July 14, 2025
Summary
Mechanical strain and cell interactions drive bone remodeling. Monocytes and pre-osteoblasts differentiate into macrophage-like and osteoblast-like cells under cyclic tensile stress, influencing bone regeneration.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Immunology
Background:
- Bone remodeling involves complex cell-cell and cell-matrix interactions.
- Immune function and bone metabolism are interconnected processes.
Purpose of the Study:
- To investigate if monocytes and pre-osteoblasts differentiate into macrophage-like and osteoblast-like cells.
- To determine the role of cyclic tensile stress and paracrine interactions in this differentiation.
Main Methods:
- Monocytic U937 and pre-osteoblastic ST2 cells were subjected to 20% cyclic equibiaxial strain for 72 hours.
- Monocytic differentiation was assessed by increased CD11B, CD14, IL-6, and IL-8 levels.
- Osteoblastic differentiation was evaluated by increased ALP expression and calcium deposition.
Main Results:
- Cyclic strain induced monocytic differentiation in U937 cells.
- Cyclic strain promoted osteoblastic differentiation in ST2 cells.
- Co-culture under strain led to reciprocal differentiation.
Conclusions:
- Cyclic tensile stress and paracrine signaling promote differentiation of monocytes and pre-osteoblasts.
- This study provides insights into the mechanobiology of bone remodeling and immune cell crosstalk.
- Findings support a model where mechanical forces regulate cell fate in bone.
