Permeability testing of biomaterial membranes
L Dreesmann1, R Hajosch, M Ahlers
1NMI Natural and Medical Sciences Institute at the University Tübingen, Markwiesenstr 55, D-72770 Reutlingen, Germany.
Biomedical Materials (Bristol, England)
|August 19, 2008
Summary
This study shows that fibroblasts increase gelatin membrane permeability by forming cavities, likely through matrix metalloproteinase secretion. This method aids biomaterial development by assessing permeability and degradation.
Area of Science:
- Biomaterials Science
- Cell Biology
- Biochemistry
Background:
- Biomaterial permeability is crucial for implant performance.
- Understanding cell-matrix interactions is key for biomaterial design.
Purpose of the Study:
- To analyze the permeability of crosslinked ultrathin gelatin membranes.
- To investigate fibroblast transmigration and degradation of gelatin membranes.
- To develop a rational approach for biomaterial development.
Main Methods:
- Two-chamber permeability assay with photometric quantification.
- Cell culturing with cytochemical analysis and cryosectioning.
- Biochemical enzyme electrophoresis (zymography) for protease activity.
Main Results:
- Gelatin membrane permeability reached diffusion equilibrium for a low molecular weight dye in 6-8 hours.
- Fibroblasts increased membrane permeability via cavity formation without prolonged penetration (>21 days in vitro).
- Zymography suggested matrix metalloproteinase secretion by fibroblasts mediated cavity formation.
Conclusions:
- The combined methods provide a rapid assessment of biomaterial permeability.
- This approach bridges descriptive methods with mechanistic understanding of biological degradation.
- Facilitates rational development of biomaterials by evaluating permeability and degradation characteristics.
