Controlled gene-eluting metal stent fabricated by bio-inspired surface modification with hyaluronic acid and deposition of DNA/PEI polyplexes.
A metal stent that could elute plasmid DNA (pDNA) in a controlled manner for substrate-mediated gene transfection was fabricated by first coating with hyaluronic acid (HA) and subsequent deposition of pDNA. To create robust HA coating layer on stainless steel (SS316L) surface, HA was derivatized with dopamine which is a well-known adsorptive molecule involving mussel adhesion process. The HA-coated surface was verified by various analytical techniques and proved to be very hydrophilic and stable, also showing superior biocompatibility in terms of suppressed plasma protein adsorption. For surface loading of pDNA, cationic pDNA/polyethylenimine (PEI) polyplexes were prepared and ionically adsorbed onto the HA-coated SS316L surface. The adsorbed surface exhibited evenly distributed nano-granular topography while the polyplexes maintained the nano-particular morphology. The pDNA was released out in a controlled manner for a period of 10 days with maintaining structural integrity. The dual coated substrate with HA and pDNA/PEI polyplexes exhibited greatly enhanced gene transfection efficiency, when compared to both bare substrate adsorbed with the polyplexes and PEI/pDNA polyelectrolyte multilayers. Dually functionalized stent with HA and pDNA exhibited effective biocompatibility and gene transfection.
Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.
Taek Gyoung
TG
Kim
Yuhan
Y
Lee
Tae Gwan
TG
Park
D000818:Animals; D057005:Bioengineering / Q000379:methods*; D019556:COS Cells; D002522:Chlorocebus aethiops; D020099:Coated Materials, Biocompatible / Q000008:administration & dosage / Q000737:chemistry; D004247:DNA / Q000008:administration & dosage / Q000737:chemistry* / Q000235:genetics; D054855:Drug-Eluting Stents; D018014:Gene Transfer Techniques / Q000295:instrumentation; D006801:Humans; D006820:Hyaluronic Acid / Q000008:administration & dosage / Q000737:chemistry*; D011094:Polyethyleneimine / Q000008:administration & dosage / Q000737:chemistry*; D013193:Stainless Steel; D013499:Surface Properties
D020099:Coated Materials, Biocompatible; D013193:Stainless Steel; D011094:Polyethyleneimine; D006820:Hyaluronic Acid; D004247:DNA