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Chondrocyte deformation within compressed agarose constructs at the cellular and sub-cellular levels
D A Lee1, M M Knight, J F Bolton
1IRC in Biomedical Materials, University College London Medical School, Stanmore, Middlesex, UK.
Journal of Biomechanics
|December 28, 1999
Summary
Articular cartilage cells deform under compression, altering cell shape and nuclear size. This study used a chondrocyte-agarose model to investigate these mechanotransduction events.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Tissue Engineering
Background:
- Mechanotransduction in articular cartilage involves extracellular and intracellular events.
- Cell deformation is a key extracellular component influencing cell response.
Purpose of the Study:
- To examine cellular and sub-cellular responses to mechanical compression in a bovine chondrocyte-agarose model.
- To investigate the relationship between cell deformation, cytoskeletal organization, and nuclear behavior.
Main Methods:
- Bovine chondrocytes seeded in agarose constructs.
- Confocal laser scanning microscopy and viable fluorescent labels for morphology.
- Unconfined compressive strains applied to constructs.
- Transmission electron microscopy for ultrastructural detail.
Main Results:
- Cell size increased with culture time, correlating with proteoglycan and collagen content.
- Cytoskeletal components (actin, microtubules, vimentin) showed temporal changes.
- Compression induced a change from spherical to elliptical cell morphology (diameter ratio 1.00 to 0.60 at 25% strain).
- Cell deformation led to increased surface area due to membrane unfolding and decreased nuclear diameter.
Conclusions:
- The chondrocyte-agarose model effectively simulates compression events at cellular and sub-cellular levels.
- Cell deformation is linked to cytoskeletal organization and nuclear response.
- Understanding these mechanotransduction events is crucial for cartilage repair and disease research.