title: Ultrafast and fast bioerodible electrospun fiber mats for topical delivery of a hydrophilic peptide.
abstract: Biodegradable polymers that provide localized controlled delivery of therapeutics within hours to days may have an impact on the topical treatment of skin burns. Here we report for the first time the utility of tyrosine-derived polycarbonate terpolymer electrospun fiber mats as tunable drug delivery matrices. "Ultrafast" (<24 h) and "fast"-eroding (<7 days) terpolymers were identified. The degradation kinetics of both terpolymers was similar (<20% of initial molecular weight after 7 days), while erosion was significantly different (<1 and 4 days for ultrafast and fast fibers, respectively). To assess the delivery kinetics, a hydrophilic peptide (P12) was incorporated into the fibers as a model drug. The tunability of polymer composition and its control over release kinetics resulted in significantly different P12 delivery timeframes: total of 9 h ("ultrafast" via polymer erosion) and 4 days ("fast" via diffusion). The biocompatibility of these fibers was confirmed in a porcine excisional wound model by the (i) lack of inflammatory response to the terpolymers and their degradation products, and (ii) normal progression of healing evaluated for 28 days. These results suggest that electrospun tyrosine-derived fibers offer the potential for topical therapies that require ultrafast or fast dose-controlled delivery of the therapeutic.
authors.affiliation: Department of Biomedical Engineering, Stony Brook University, HSC T16-060, Stony Brook, NY 11794, USA.
authors.forename: Lauren K
authors.initials: LK
authors.lastname: Macri
authors.forename: Larisa
authors.initials: L
authors.lastname: Sheihet
authors.forename: Adam J
authors.initials: AJ
authors.lastname: Singer
authors.forename: Joachim
authors.initials: J
authors.lastname: Kohn
authors.forename: Richard A F
authors.initials: RA
authors.lastname: Clark
mesh_terms: D000287:Administration, Topical; D000818:Animals; D004195:Disease Models, Animal; D016503:Drug Delivery Systems; D057927:Hydrophobic and Hydrophilic Interactions; D010455:Peptides / Q000008:administration & dosage* / Q000737:chemistry; D011076:Polycarboxylate Cement / Q000737:chemistry; D012867:Skin / Q000293:injuries; D013552:Swine; D014945:Wound Healing
chemical_list: D010455:Peptides; D011076:Polycarboxylate Cement; C005506:polycarbonate