Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/106414
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Type: Journal article
Title: A topical hydrogel with deferiprone and gallium-protoporphyrin targets bacterial iron metabolism and has antibiofilm activity
Author: Richter, K.
Thomas, N.
Claeys, J.
McGuane, J.
Prestidge, C.
Coenye, T.
Wormald, P.
Vreugde, S.
Citation: Antimicrobial Agents and Chemotherapy, 2017; 61(6):e00481-17-1-e00481-17-11
Publisher: American Society for Microbiology
Issue Date: 2017
ISSN: 0066-4804
1098-6596
Statement of
Responsibility: 
Katharina Richter, Nicky Thomas, Jolien Claeys, Jonathan McGuane, Clive A. Prestidge, Tom Coenye, Peter-John Wormald, Sarah Vreugde
Abstract: Many infectious diseases are associated with multidrug-resistant (MDR) bacteria residing in biofilms that require high antibiotic concentrations. While oral drug delivery is frequently ineffective, topical treatments have the potential to deliver higher drug concentrations to the infection site while reducing systemic side effects. This study determined the antibiofilm activity of a surgical wound gel loaded with the iron chelator deferiprone (Def) and the heme analogue gallium-protoporphyrin (GaPP), alone and in combination with ciprofloxacin. Activity against MDR Staphylococcus aureus, Staphylococcus epidermidis, Pseudomonas aeruginosa, and Acinetobacter johnsonii biofilms was assessed in the colony biofilm and artificial wound model by enumeration of CFU and correlative light/electron microscopy. While Staphylococcus biofilms were equally susceptible to GaPP and Def-GaPP gels (log10 reduction of 3.8 and 3.7, respectively), the Def-GaPP combination was crucial for significant activity against P. aeruginosa biofilms (log10 reduction of 1.3 for GaPP and 3.3 for Def-GaPP). When Def-GaPP gel was combined with ciprofloxacin, the efficacy exceeded the activity of the individual compounds. Def-GaPP delivered in a surgical wound gel showed significant antibiofilm activity against different MDR strains and could enhance the gel's wound-healing properties. Moreover, Def-GaPP indicated a potentiation of ciprofloxacin. This antibiofilm strategy has potential for clinical utilization as a therapy for topical biofilm-related infections.
Keywords: antimicrobial combinations; biofilms; drug delivery; iron metabolism
Description: Accepted manuscript posted online 10 April 2017
Rights: Copyright © 2017 American Society for Microbiology. All Rights Reserved.
RMID: 0030067969
DOI: 10.1128/AAC.00481-17
Grant ID: http://purl.org/au-research/grants/nhmrc/1090898
Appears in Collections:Surgery publications

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