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Updated: May 10, 2026
A Mouse Model to Assess Innate Immune Response to Staphylococcus aureus Infection
Published on: February 28, 2019
A peptide-morpholino oligomer conjugate targeting Staphylococcus aureus gyrA mRNA improves healing in an infected
Andrew J Sawyer1, Donna Wesolowski, Neeru Gandotra
1Department of Pathology, Yale University, New Haven, CT 06520, USA.
Abstract:
Management of skin wound infections presents a serious problem in the clinic, in the community, and in both civilian and military clinical treatment centers. Staphylococcus aureus is one of the most common microbial pathogens in cutaneous wounds. Peptide-morpholino oligomer (PMO) conjugates targeted to S. aureus gyrase A mRNA have shown the ability to reduce bacterial viability by direct site-specific mRNA cleavage via RNase P. As a treatment, these conjugates have the added advantages of not being susceptible to resistance due to genetic mutations and are effective against drug resistant strains. While this strategy has proven effective in liquid culture, it has yet to be evaluated in an animal model of infected surface wounds. In the present study, we combined PMO conjugates with a thermoresponsive gel delivery system to treat full-thickness mouse cutaneous wounds infected with S. aureus. Wounds treated with a single dose of PMO conjugate displayed improved healing that was associated with increased epithelialization, reduced bacterial load, and increased matrix deposition. Taken together, our findings demonstrate the efficacy and flexibility of the PMO conjugate drug delivery system and make it an attractive and novel topical antimicrobial agent.
Insights
Novel peptide-morpholino oligomer (PMO) conjugates delivered via a thermoresponsive gel effectively treat Staphylococcus aureus skin wound infections in mice. This topical antimicrobial agent promotes healing and reduces bacterial load without inducing resistance.
Area of Science:
- Microbiology
- Biotechnology
- Dermatology
Background:
- Staphylococcus aureus is a common cause of skin wound infections.
- Current treatments face challenges with drug resistance.
- Peptide-morpholino oligomer (PMO) conjugates offer a novel approach by targeting bacterial mRNA.
Purpose of the Study:
- To evaluate the efficacy of PMO conjugates combined with a thermoresponsive gel for treating S. aureus infected skin wounds in a mouse model.
- To assess the impact of this novel delivery system on wound healing parameters.
Main Methods:
- Full-thickness mouse cutaneous wounds were infected with S. aureus.
- Wounds were treated with a single dose of PMO conjugate incorporated into a thermoresponsive gel.
- Wound healing, bacterial load, epithelialization, and matrix deposition were analyzed.
Main Results:
- A single dose of PMO conjugate significantly improved wound healing.
- Treated wounds showed increased epithelialization and matrix deposition.
- A notable reduction in bacterial load was observed in the treated group.
Conclusions:
- PMO conjugates delivered via a thermoresponsive gel are effective topical antimicrobial agents for S. aureus skin wound infections.
- This combination strategy demonstrates potential for treating drug-resistant bacterial infections.
- The system shows promise as a novel therapeutic for cutaneous wound management.
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