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Endothelial cell responses to castor oil-based polyurethane substrates functionalized by direct laser ablation
L R X Cortella1, I A Cestari1, D Guenther2,3
1Bioengineering Department, Heart Institute (InCor), University of São Paulo Medical School, Av. Dr Enéas de Carvalho Aguiar, 44, 05403-900-São Paulo, SP, Brazil.
Biomedical Materials (Bristol, England)
|August 2, 2017
Summary
Laser-patterned polyurethane surfaces promote endothelial cell growth, crucial for preventing blood clots in cardiovascular implants. This micro-patterning technique enhances cell adhesion and alignment, paving the way for safer medical devices.
Area of Science:
- Biomaterials Engineering
- Surface Science
- Cardiovascular Device Technology
Background:
- Polyurethanes are widely used in cardiovascular devices but suffer from surface-induced thrombosis and poor endothelialization.
- Developing strategies to promote endothelial cell adhesion and growth on implant surfaces is critical for improving device safety and efficacy.
Purpose of the Study:
- To investigate the use of laser-induced micro-topographical patterns on polyurethane surfaces to enhance endothelialization.
- To evaluate the impact of specific surface patterns on endothelial cell adhesion, proliferation, morphology, and alignment.
Main Methods:
- Direct laser radiation was employed to create micro-scale topographical patterns (line-like and pillar-like) on castor oil-based polyurethane.
- Cultured endothelial cells were seeded onto the patterned surfaces to assess cell behavior.
Main Results:
- Both line-like and pillar-like patterns significantly improved endothelial cell adhesion and proliferation rates.
- A line-like pattern with 1 μm groove periodicity demonstrated the highest efficacy in enhancing cell adhesion.
- This optimal pattern also induced significant endothelial cell polarization and alignment.
Conclusions:
- Laser-based surface texturing is a viable method for functionalizing polyurethane cardiovascular implants.
- Tailored micro-topography can effectively promote the development of a functional endothelium, mitigating thrombosis risk.
- This approach holds promise for the fabrication of safer and more biocompatible cardiovascular devices.
