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Synthetic extracellular matrices for in situ tissue engineering
Alison B Pratt1, Franz E Weber, Hugo G Schmoekel
1Institute for Biomedical Engineering, Swiss Federal Institute of Technology (ETH) and University of Zurich, Moussonstrasse 18, CH-8044 Zurich, Switzerland.
Biotechnology and Bioengineering
|March 10, 2004
Summary
Synthetic hydrogels mimic the extracellular matrix, promoting cell infiltration and bone healing. These smart biomaterials respond to cell proteases and deliver growth factors for enhanced tissue regeneration.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Biology
Background:
- Cell-matrix interactions guide tissue development and remodeling.
- The extracellular matrix influences cell differentiation and is remodeled by cell proteases.
- Synthetic materials can be engineered to mimic these complex biological interactions.
Purpose of the Study:
- To design synthetic hydrogels that mimic extracellular matrix functions.
- To investigate cell infiltration and tissue regeneration in response to engineered hydrogels.
- To evaluate the role of specific matrix components and cell-mediated remodeling in these processes.
Main Methods:
- Poly(ethylene glycol)-bis-vinylsulfone hydrogels were synthesized using plasmin-sensitive peptides.
- Hydrogels incorporated adhesion peptides and bone morphogenetic protein-2 (BMP-2).
- Cell infiltration and bone healing in a rat model were assessed.
Main Results:
- Cells infiltrated hydrogels with adhesion peptides and plasmin-sensitive crosslinkers.
- Materials lacking these features resisted cell infiltration.
- Adhesive and plasmin-sensitive hydrogels with BMP-2 promoted bone healing.
- Heparin incorporation further enhanced bone regeneration.
Conclusions:
- Synthetic hydrogels can be designed to actively participate in cell-matrix crosstalk.
- Plasmin-sensitive crosslinking and adhesion motifs are crucial for cell infiltration.
- These biomaterials show promise for promoting bone regeneration and tissue repair.