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Mouse model of chronic post-arthroplasty infection: noninvasive in vivo bioluminescence imaging to monitor bacterial burden for long-term study.
Pribaz, Jonathan R; Bernthal, Nicholas M; Billi, Fabrizio; Cho, John S; Ramos, Romela Irene; Guo, Yi; Cheung, Ambrose L; Francis, Kevin P; Miller, Lloyd S.
Affiliation
  • Pribaz JR; Orthopaedic Hospital Research Center, Orthopaedic Hospital Department of Orthopaedic Surgery, David Geffen School of Medicine at University of California, Los Angeles (UCLA), USA.
J Orthop Res ; 30(3): 335-40, 2012 Mar.
Article in En | MEDLINE | ID: mdl-21837686
ABSTRACT
Post-arthroplasty infections are a devastating problem in orthopaedic surgery. While acute infections can be treated with a single stage washout and liner exchange, chronic infections lead to multiple reoperations, prolonged antibiotic courses, extended disability, and worse clinical outcomes. Unlike previous mouse models that studied an acute infection, this work aimed to develop a model of a chronic post-arthroplasty infection. To achieve this, a stainless steel implant in the knee joints of mice was inoculated with a bioluminescent Staphylococcus aureus strain (1 × 10(2) -1 × 10(4) colony forming units, CFUs) and in vivo imaging was used to monitor the bacterial burden for 42 days. Four different S. aureus strains were compared in which the bioluminescent construct was integrated in an antibiotic selection plasmid (ALC2906), the bacterial chromosome (Xen29 and Xen40), or a stable plasmid (Xen36). ALC2906 had increased bioluminescent signals through day 10, after which the signals became undetectable. In contrast, Xen29, Xen40, and Xen36 had increased bioluminescent signals through 42 days with the highest signals observed with Xen36. ALC2906, Xen29, and Xen40 induced significantly more inflammation than Xen36 as measured by in vivo enhanced green fluorescence protein (EGFP)-neutrophil flourescence of LysEGFP mice. All four strains induced comparable biofilm formation as determined by variable-pressure scanning electron microscopy. Using a titanium implant, Xen36 had higher in vivo bioluminescence signals than Xen40 but had similar biofilm formation and adherent bacteria. In conclusion, Xen29, Xen40, and especially Xen36, which had stable bioluminescent constructs, are feasible for long-term in vivo monitoring of bacterial burden and biofilm formation to study chronic post-arthroplasty infections and potential antimicrobial interventions.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Postoperative Complications / Staphylococcus aureus / Arthritis, Infectious / Joint Prosthesis / Luminescent Measurements Type of study: Prognostic_studies Limits: Animals Language: En Journal: J Orthop Res Year: 2012 Type: Article Affiliation country: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Postoperative Complications / Staphylococcus aureus / Arthritis, Infectious / Joint Prosthesis / Luminescent Measurements Type of study: Prognostic_studies Limits: Animals Language: En Journal: J Orthop Res Year: 2012 Type: Article Affiliation country: United States