Related Experiment Videos
Cell orientation determines the alignment of cell-produced collagenous matrix
James H-C Wang1, Fengyan Jia, Thomas W Gilbert
1Department of Orthopaedic Surgery, Musculoskeletal Research Center, University of Pittsburgh Medical Center, E1641 Biomedical Science Tower, 210 Lothrop Street, PO Box 71199, Pittsburgh, PA 15213, USA. wanghc@pitt.edu
Journal of Biomechanics
|December 18, 2002
Summary
Cell orientation influences collagen matrix organization in healing tissues. Guiding cell alignment may improve ligament and tendon repair by restoring tissue structure and mechanical properties.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Biology
Background:
- Healing ligaments and tendons exhibit disorganized cells and collagen matrix, leading to abnormal mechanical properties.
- The lack of cellular alignment in healing tissues is hypothesized to cause disorganized collagen matrix formation.
Purpose of the Study:
- To investigate the relationship between cell orientation and collagen matrix organization using an in vitro model.
- To determine if controlled cell alignment can promote organized collagen matrix formation relevant to ligament and tendon healing.
Main Methods:
- MC3T3-E1 cells, known for high collagen production, were cultured on silicone membranes with parallel microgrooves and on smooth surfaces.
- Microgrooves (10 µm wide x 3 µm deep) were used to control cell orientation.
- Collagen matrix organization was analyzed using immunohistochemical staining for type I collagen and polarized light microscopy.
Main Results:
- Cells cultured on microgrooved surfaces aligned parallel to the grooves.
- A well-organized type I collagen matrix was observed along the direction of microgrooves.
- Cells on smooth surfaces showed random orientation and produced a disorganized collagen matrix.
Conclusions:
- Cell orientation directly impacts the organization of the collagenous matrix produced.
- Orienting cells in a manner mimicking native ligament and tendon structure may enhance matrix alignment.
- This approach holds potential for improving the mechanical properties of healing ligaments and tendons.