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Control of cell adhesion on poly(methyl methacrylate)
Shyam Patel1, Rahul G Thakar, Josh Wong
1Department of Bioengineering, University of California-Berkeley, 471 Evans Hall #1762, 94720, USA.
Biomaterials
|January 28, 2006
Summary
Researchers developed a new way to modify poly(methyl methacrylate) (PMMA) surfaces for better keratoprosthesis implants. This surface modification selectively controls cell adhesion, improving implant integration and reducing membrane formation.
Area of Science:
- Biomaterials Science
- Ophthalmology
- Tissue Engineering
Background:
- Keratoprostheses (artificial corneas) made from poly(methyl methacrylate) (PMMA) face challenges like poor implant-host integration and fibrous membrane formation.
- These issues stem from weak cell adhesion and uncontrolled fibroblast attachment on the PMMA surface.
Purpose of the Study:
- To develop a surface modification strategy for PMMA to achieve region-specific control of cell adhesion.
- To enhance cell attachment at the implant-host interface while reducing it on the inner implant surface.
Main Methods:
- Grafting di-amino-poly(ethylene glycol) (PEG) onto PMMA surfaces via hydrolysis or aminolysis.
- Functionalizing the grafted PEG with RGD peptides to promote cell adhesion.
- Evaluating cell attachment, spreading, migration, and micropatterning on modified PMMA surfaces.
Main Results:
- The modified PMMA surfaces demonstrated region-specific control over cell adhesion.
- RGD peptide functionalization restored and enhanced cell attachment and spreading compared to unmodified PMMA.
- Long-term studies confirmed the ability to differentiate and spatially control cell adhesion on PEG-PMMA surfaces.
Conclusions:
- The novel peptide conjugation scheme effectively modifies PMMA surfaces for controlled cell adhesion.
- This technique offers a promising approach for improving keratoprosthesis performance by optimizing the implant-host interface and preventing membrane formation.