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Mechanical compression modulates proliferation of transplanted chondrocytes
K W Li1, Y H Falcovitz, J P Nagrampa
1Department of Bioengineering and Institute for Biomedical Engineering, University of California-San Diego, La Jolla 92093-0412, USA.
Summary
Chondrocyte transplantation for cartilage repair shows significant proliferation without mechanical load. However, static compressive stress greatly inhibits this cell growth, impacting repair outcomes.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Orthopedics
Background:
- Successful articular cartilage repair requires adequate reparative cells.
- Chondrocyte transplantation is a potential strategy for cartilage defect treatment.
- Cell proliferation post-transplantation influences defect cellularity and repair outcomes.
Purpose of the Study:
- To investigate the proliferative response of chondrocytes after attachment to cartilage.
- To determine the effect of static compressive stress on chondrocyte proliferation in an ex vivo model.
Main Methods:
- Isolation and transplantation of adult bovine chondrocytes onto devitalized cartilage.
- Culture of transplanted cells with and without static compressive stress (0.06-0.4 MPa).
- Quantification of cell proliferation via total DNA content and [3H]thymidine incorporation.
Main Results:
- Chondrocytes exhibited a 4-fold increase in cell number without load over 5 days.
- Cell proliferation, measured by DNA synthesis, decreased significantly per cell over time.
- Static compressive stress (24 hours) inhibited DNA synthesis by 70-87% compared to controls.
- Proliferation remained low after the release of compressive load.
Conclusions:
- Chondrocytes proliferate significantly when attached to cartilage without mechanical load.
- Static compressive stress markedly inhibits chondrocyte proliferation, potentially relevant to clinical outcomes.
- The in vivo mechanical environment may significantly influence transplanted chondrocyte behavior and cartilage repair.