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Heat-shock-induced cellular responses to temperature elevations occurring during orthopaedic cutting
E B Dolan1, M G Haugh, D Tallon
1Department of Mechanical and Biomedical Engineering, Biomechanics Research Centre (BMEC), National University of Ireland, Galway, Ireland.
Journal of the Royal Society, Interface
|August 24, 2012
Summary
Mild heat-shock during surgery can promote bone regeneration. This study shows moderate heat exposure enhances bone cell differentiation and mineralization, aiding osseointegration, while severe heat causes cell death.
Area of Science:
- Orthopaedic Surgery
- Cell Biology
- Biomaterials Science
Background:
- Orthopaedic procedures can cause thermal damage to bone cells, leading to resorption.
- Mild heat-shock has been suggested to promote bone regeneration, but evidence is limited.
Purpose of the Study:
- To investigate the effects of heat-shock durations relevant to surgical cutting on bone cell viability, apoptosis, and regeneration.
- To determine the potential of mild heat-shock to enhance osseointegration.
Main Methods:
- Exposed osteocyte-like MLO-Y4 and osteoblast-like MC3T3-E1 cells to heat-shock (45°C, 47°C, 60°C).
- Assessed cellular viability, necrosis, and apoptosis using flow cytometry immediately and after recovery.
- Quantified proliferation, differentiation, and mineralization in heat-shocked mesenchymal stem cells (MSCs) and MC3T3-E1s after 7 and 14 days.
Main Results:
- Immediate necrosis observed at elevated temperatures (45°C, 47°C, 60°C).
- Longer-term apoptosis induced in MLO-Y4 cells and to a lesser extent in MC3T3-E1 cells.
- Mild heat-shock (≤47°C) induced differentiation and mineralization in MSCs, enhancing osseointegration potential.
Conclusions:
- Heat-shock induces apoptosis in osteocytes more readily than osteoblasts, suggesting a role in damage sensing.
- Mild heat-shock, consistent with surgical cutting durations, positively influences osteoprogenitor cells.
- This study demonstrates, for the first time, that mild heat-shock can enhance osseointegration.
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