1. Local sustained delivery of acetylsalicylic acid via hybrid stent with biodegradable nanofibers reduces adhesion of blood cells and promotes reendothelialization of the denuded artery.
- Author
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Lee CH, Lin YH, Chang SH, Tai CD, Liu SJ, Chu Y, Wang CJ, Hsu MY, Chang H, Chang GJ, Hung KC, Hsieh MJ, Lin FC, Hsieh IC, Wen MS, and Huang Y
- Subjects
- Animals, Aspirin chemistry, Cell Adhesion drug effects, Drug Implants administration & dosage, Drug Implants chemistry, Endothelium, Vascular drug effects, Endothelium, Vascular injuries, Fibrinolytic Agents administration & dosage, Fibrinolytic Agents chemistry, Nanofibers ultrastructure, Neovascularization, Physiologic drug effects, Neovascularization, Physiologic physiology, Particle Size, Rabbits, Treatment Outcome, Absorbable Implants, Aspirin administration & dosage, Blood Vessel Prosthesis, Endothelium, Vascular physiopathology, Nanofibers chemistry, Platelet Adhesiveness drug effects, Stents
- Abstract
Incomplete endothelialization, blood cell adhesion to vascular stents, and inflammation of arteries can result in acute stent thromboses. The systemic administration of acetylsalicylic acid decreases endothelial dysfunction, potentially reducing thrombus, enhancing vasodilatation, and inhibiting the progression of atherosclerosis; but, this is weakened by upper gastrointestinal bleeding. This study proposes a hybrid stent with biodegradable nanofibers, for the local, sustained delivery of acetylsalicylic acid to injured artery walls. Biodegradable nanofibers are prepared by first dissolving poly(D,L)-lactide-co-glycolide and acetylsalicylic acid in 1,1,1,3,3,3-hexafluoro-2-propanol. The solution is then electrospun into nanofibrous tubes, which are then mounted onto commercially available bare-metal stents. In vitro release rates of pharmaceuticals from nanofibers are characterized using an elution method, and a highperformance liquid chromatography assay. The experimental results suggest that biodegradable nanofibers release high concentrations of acetylsalicylic acid for three weeks. The in vivo efficacy of local delivery of acetylsalicylic acid in reducing platelet and monocyte adhesion, and the minimum tissue inflammatory reaction caused by the hybrid stents in treating denuded rabbit arteries, are documented. The proposed hybrid stent, with biodegradable acetylsalicylic acid-loaded nanofibers, substantially contributed to local, sustained delivery of drugs to promote re-endothelialization and reduce thrombogenicity in the injured artery. The stents may have potential applications in the local delivery of cardiovascular drugs. Furthermore, the use of hybrid stents with acetylsalicylic acid-loaded nanofibers that have high drug loadings may provide insight into the treatment of patients with high risk of acute stent thromboses.
- Published
- 2014
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