title: A new drug delivery system with controlled release of antibiotic only in the presence of infection.
abstract: An ideal drug delivery system (DDS) releases an appropriate drug at specific locations and times. We tried to create a new antibiotic delivery system that releases gentamicin only when wounds are infected by Pseudomonas aeruginosa (P.A.). Exudate from the dorsal pouch of rats infected with P.A. showed significantly higher hydrolytic activity-thrombin-like activity-toward Boc-Val-Pro-Arg-MCA than exudate from noninfected wounds. We therefore constructed a device for controlled release of an antimicrobial drug triggered by thrombin-like activity. Briefly, gentamicin was bound to a polyvinyl alcohol derivative (PVA) hydrogel through a newly developed peptide linker cleavable by the proteinase, PVA-(linker)-gentamicin. In vitro experiments showed that proteinases from wounds infected with P.A. cleaved the linker and gentamicin was released while the exudate from noninfected wounds had no hydrolytic activity toward the linker. This device shows potential as an occlusive dressing with an effective antibiotic delivery system for treating infected wounds.
authors.affiliation: Department of Plastic and Reconstructive Surgery, Faculty of Medicine, Kyoto University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Tanihara
authors.forename: Y
authors.initials: Y
authors.lastname: Nishimura
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: Y
authors.initials: Y
authors.lastname: Kakimaru
authors.forename: Y
authors.initials: Y
authors.lastname: Shimizu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D001458:Bandages; D016503:Drug Delivery Systems; D008297:Male; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D011552:Pseudomonas Infections / Q000188:drug therapy* / Q000201:enzymology; D051381:Rats; D017208:Rats, Wistar; D013917:Thrombin / Q000378:metabolism; D014947:Wounds and Injuries / Q000201:enzymology
chemical_list: D000900:Anti-Bacterial Agents; D013917:Thrombin