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Functional Nanoarchitectures For Enhanced Drug Eluting Stents
Yomna E Saleh1, Mohamed A Gepreel2, Nageh K Allam1
1Energy Materials Laboratory (EML), School of Sciences and Engineering, The American University in Cairo, New Cairo 11835, Egypt.
Scientific Reports
|January 13, 2017
Summary
This study developed a novel nanoarchitectured surface for drug-eluting stents using a titanium alloy. The nanotubes enhance endothelial healing and control cell growth, offering a promising stent modification.
Area of Science:
- Biomaterials Engineering
- Nanotechnology
- Cardiovascular Research
Background:
- Coronary stent surface modification is crucial for improving endothelium healing and preventing restenosis.
- Drug-eluting stents (DES) aim to control neointimal hyperplasia by releasing drugs, but optimal drug elution and biocompatibility remain challenges.
- Novel materials and nanostructures are needed to enhance stent performance and patient outcomes.
Purpose of the Study:
- To develop and characterize a nanoarchitectured surface modification for drug-eluting stents using a Ni-free Ti-based alloy.
- To investigate the potential of vertically grown nanotubes to enhance endothelial cell proliferation and act as a drug reservoir.
- To evaluate the effect of nanotube morphology on stent performance and biocompatibility.
Main Methods:
- Fabrication of highly oriented nanotubes on a Ti-based alloy substrate.
- Characterization using FESEM, XRD, Raman spectroscopy, EDX, and XPS.
- Mechanical testing via nanoindentation and in-vitro cytotoxicity/proliferation studies with endothelial cells.
- Drug loading capacity assessment and release profile modeling.
Main Results:
- Successful synthesis of two distinct nanotube morphologies on the Ti-based alloy.
- Demonstrated potential of nanotubes to support endothelial cell proliferation.
- Evidence of nanotubes acting as a drug reservoir to inhibit Vascular Smooth Muscle Cell (VSMC) proliferation.
- Characterization confirmed the material's properties and biocompatibility.
Conclusions:
- The developed nanoarchitectured system shows significant promise as a surface modification for drug-eluting stents.
- The nanotube structures offer a dual function: promoting endothelial healing and controlling VSMC proliferation.
- This approach represents a viable strategy for enhancing the efficacy and safety of coronary stents.
