title: Lysostaphin-coated titan-implants preventing localized osteitis by Staphylococcus aureus in a mouse model.
abstract: The increasing incidence of implant-associated infections induced by Staphylococcus aureus (SA) in combination with growing resistance to conventional antibiotics requires novel therapeutic strategies. In the current study we present the first application of the biofilm-penetrating antimicrobial peptide lysostaphin in the context of bone infections. In a standardized implant-associated bone infection model in mice beta-irradiated lysostaphin-coated titanium plates were compared with uncoated plates. Coating of the implant was established with a poly(D,L)-lactide matrix (PDLLA) comprising lysostaphin formulated in a stabilizing and protecting solution (SPS). All mice were osteotomized and infected with a defined count of SA. Fractures were fixed with lysostaphin-coated locking plates. Plates uncoated or PDLLA-coated served as controls. All mice underwent debridement and lavage on Days 7, 14, 28 to determine the bacterial load and local immune reaction. Fracture healing was quantified by conventional radiography. On Day 7 bacterial growth in the lavages of mice with lysostaphin-coated plates showed a significantly lower count to the control groups. Moreover, in the lysostaphin-coated plate groups complete fracture healing were observed on Day 28. The fracture consolidation was accompanied by a diminished local immune reaction. However, control groups developed an osteitis with lysis or destruction of the bone and an evident local immune response. The presented approach of terminally sterilized lysostaphin-coated implants appears to be a promising therapeutic approach for low grade infection or as prophylactic strategy in high risk fracture care e.g. after severe open fractures.
authors.affiliation: Department of Trauma- and Hand Surgery, Heinrich-Heine University Duesseldorf, Moorenstr. 5, 40225, Duesseldorf, Germany.
authors.forename: Ceylan D
authors.initials: CD
authors.lastname: Windolf
authors.affiliation: Department of Trauma- and Hand Surgery, Heinrich-Heine University Duesseldorf, Moorenstr. 5, 40225, Duesseldorf, Germany.
authors.forename: Tim
authors.initials: T
authors.lastname: Lögters
authors.affiliation: Department of Trauma- and Hand Surgery, Heinrich-Heine University Duesseldorf, Moorenstr. 5, 40225, Duesseldorf, Germany; LEUKOCARE AG, Am Klopferspitz 19, 82152, Martinsried/Munich, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Scholz
authors.affiliation: Department of Trauma- and Hand Surgery, Heinrich-Heine University Duesseldorf, Moorenstr. 5, 40225, Duesseldorf, Germany.
authors.forename: Joachim
authors.initials: J
authors.lastname: Windolf
authors.affiliation: Department of Trauma- and Hand Surgery, Heinrich-Heine University Duesseldorf, Moorenstr. 5, 40225, Duesseldorf, Germany.
authors.forename: Sascha
authors.initials: S
authors.lastname: Flohé
mesh_terms: D000818:Animals; D000891:Anti-Infective Agents, Local / Q000008:administration & dosage / Q000627:therapeutic use*; D001860:Bone Plates / Q000009:adverse effects*; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D005260:Female; D017102:Fracture Healing / Q000187:drug effects; D015850:Interleukin-6 / Q000276:immunology; D008248:Lysostaphin / Q000008:administration & dosage / Q000627:therapeutic use*; D051379:Mice; D008807:Mice, Inbred BALB C; D010000:Osteitis / Q000209:etiology / Q000276:immunology / Q000382:microbiology / Q000517:prevention & control*; D011091:Polyesters / Q000737:chemistry; D013203:Staphylococcal Infections / Q000209:etiology / Q000276:immunology / Q000382:microbiology / Q000517:prevention & control*; D013211:Staphylococcus aureus / Q000187:drug effects*; D014025:Titanium / Q000737:chemistry
chemical_list: D000891:Anti-Infective Agents, Local; D020099:Coated Materials, Biocompatible; D015850:Interleukin-6; D011091:Polyesters; C033616:poly(lactide); D014025:Titanium; D008248:Lysostaphin