Biodegradable Polymerized Simvastatin

Synthetic biodegradable polymers are commonly used for drug delivery and to aid in tissue regeneration. Drugs are routinely encapsulated in the material for subsequent diffusion- and/or degradation-mediated release. Limitations with encapsulation, however, include limited payload and the potential for premature exhaustion of the delivery system. To prolong release, drugs have been conjugated to polymers. Drug can be attached to the polymer via a linker that subsequently releases the molecule following cleavage, or it drug can be incorporated into the polymeric backbone during synthesis. The overarching goal of this project is to develop and characterize a polymer synthesized using drug molecules, in the present case simvastatin, as monomers. The working hypothesis is that the structure of simvastatin, with a lactone ring in the prodrug form, is amenable to ring-opening polymerization. As such, polymerized simvastatin could then be processed into films that degrade by hydrolysis and release bioactive simvastatin molecules, which have osteogenic, anti-inflammatory, and angiogenic properties in addition to their well-known popularly known hypolipidemic effects. Aim 1 will develop and characterize a biodegradable, polymerized form of simvastatin. With respect to this Aim, it is hypothesized that the polymer can be processed into biodegradable films that release simvastatin. Aim 2 will investigate whether polymerized films of simvastatin degrade in vivo to stimulate osteogenesis in a rodent supracalvarial implant model. It is hypothesized that, as the polymer degrades, bioactive simvastatin is released to enhance local bone formation. If the proof-of-principle studies proposed for this Exploratory/Developmental Award are successful, the polymer may be fabricated into other physical forms (e.g., microspheres and tissue engineering scaffolds), as well as the methods potentially being applicable to other members of the statin family.