Determining the protein drug release characteristics and cell adhesion to a PLLA or PLGA biodegradable polymer membrane

Biodegradable polymers are of interest for developing controlled protein drug delivery platforms. in this study, two poly (alpha-hydroxy) esters were formulated with Aerosol-OT, a surfactant stabilizer, to encapsulate the protein keratinocyte growth factor (KG F) for controlled release KGF is involved in a number of crucial biologic processes, most notably epithelial growth and repair. The concentration of KGF that caused a biological response in vitro was determined (optimally 10 ng/mL) and compared with the release of KGF from the two biodegradable polymer membrane formulations. Each polymer formulation released biologically relevant levels, 10 ng/mL of active KG F, although with different times release kinetics. The membrane composed of PLGA/AOT/KGF exhibited a faster release rate of KGF into solution after 120 h of degradation time than the release rate of the PLLA/AOT/KGF matrices. Cell seeding assays showed that both polymer matrices, when formulated with AOT, sustained cell growth. Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) was used to characterize the distribution of AOT and KGF through the polymer membrane. (C) 2010 Wiley Periodicals, Inc. J Biomed Mater Res 94A: 27-37, 2010