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Updated: Aug 21, 2026
In Vivo Mouse Model of Spinal Implant Infection
Published on: June 23, 2020
In vivo comparison of Dhvar-5 and gentamicin in an MRSA osteomyelitis prevention model
Christopher Faber1, Roel J W Hoogendoorn, Hein P Stallmann
1Department of Orthopaedic Surgery, VU University Medical Center, PO Box 7057, 1007 MB Amsterdam, The Netherlands.
Objectives:
The continued rise in drug-resistant pathogens has led to global research efforts into new antimicrobial agents. A promising class of new agents are the antimicrobial peptides. The aim of the study was to investigate the efficacy of the antimicrobial peptide Dhvar-5 in a prophylactic, methicillin-resistant Staphylococcus aureus (MRSA) osteomyelitis model.
Methods:
Dhvar-5 (12 mg or 24 mg/rabbit) was incorporated into polymethyl methacrylate (PMMA) beads as a local drug delivery system. For comparison, plain beads (control) and beads containing gentamicin as a sulphate (10 mg or 24 mg per rabbit) were also prepared. The beads were inserted into the inoculated femoral cavity of 36 rabbits, and 1 week later they were killed. The presence and severity of MRSA osteomyelitis was assessed by culture and histology.
Results:
Both the 24 mg Dhvar-5 beads and the 24 mg gentamicin sulphate beads significantly reduced the bacterial load of the inoculated femora compared with the control chain. Although a 24 mg Dhvar-5 dose inhibited MRSA growth, it did not completely sterilize the femora. Sterilization occurred only in some of the gentamicin-treated specimens.
Conclusion:
We conclude that both the gentamicin beads and the Dhvar-5 beads were only partially effective at preventing MRSA infection in this model.
Insights
Antimicrobial peptide Dhvar-5 and gentamicin beads showed partial effectiveness against methicillin-resistant Staphylococcus aureus (MRSA) osteomyelitis in rabbits. Neither treatment fully sterilized the infection, indicating limited efficacy in this prophylactic model.
Area of Science:
- Infectious Diseases
- Pharmacology
- Biomaterials
Background:
- Rising antimicrobial resistance necessitates novel therapeutic strategies.
- Antimicrobial peptides represent a promising class of new agents.
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant threat in healthcare settings.
Purpose of the Study:
- To evaluate the prophylactic efficacy of the antimicrobial peptide Dhvar-5.
- To assess Dhvar-5's effectiveness in a rabbit model of MRSA osteomyelitis.
- To compare Dhvar-5 with gentamicin sulphate in a local drug delivery system.
Main Methods:
- Dhvar-5 and gentamicin sulphate were incorporated into polymethyl methacrylate (PMMA) beads.
- Beads were implanted into the femoral cavity of rabbits with induced MRSA osteomyelitis.
- Infection severity was assessed via bacterial culture and histology post-mortem.
Main Results:
- Both 24 mg Dhvar-5 and 24 mg gentamicin sulphate beads significantly reduced bacterial load compared to controls.
- Dhvar-5 inhibited MRSA growth but did not achieve complete sterilization of the femora.
- Complete sterilization was observed in a subset of gentamicin-treated rabbits.
Conclusions:
- Both gentamicin and Dhvar-5 beads demonstrated partial effectiveness in preventing MRSA osteomyelitis.
- Neither treatment fully eradicated the infection in the studied prophylactic model.
- Further research may be needed to optimize antimicrobial peptide delivery and efficacy.
