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Action of antimicrobial peptides and their prodrugs on model and biological membranes
Royal Coll Surgeons Ireland, Dept Chem, 123 St Stephens Green, Dublin 2, Ireland;Royal Coll Surgeons Ireland, Dept Clin Microbiol, Dublin 9, Ireland.
Royal Coll Surgeons Ireland, Dept Chem, 123 St Stephens Green, Dublin 2, Ireland;Royal Coll Surgeons Ireland, Dept Clin Microbiol, Dublin 9, Ireland.
Royal Coll Surgeons Ireland, Dept Clin Microbiol, Dublin 9, Ireland.ORCID iD: 0000-0002-4843-3839
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry, Farmakognosi.ORCID iD: 0000-0001-9070-6944
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2018 (English)In: Journal of Peptide Science, ISSN 1075-2617, E-ISSN 1099-1387, Vol. 24, no 7, article id e3086Article in journal (Refereed) Published
Abstract [en]

Antimicrobial peptides (AMPs) are promising broad-spectrum antibiotic candidates in the wake of multi-drug resistant pathogens. Their clinical use still requires a solution based on lead optimisation and/ or formulation to overcome certain limitations, such as unwanted cytotoxicity. A prodrug approach could overcome this safety barrier and can be achieved through reversible reduction or neutralisation of the AMPs' net cationic charge. By prodrug activation through pathogen associated enzymes, this approach could increase the therapeutic index of membrane active peptides. P18, a cecropin/ magainin hybrid, and WMR, a myxinidin analogue from hagfish, were used as templates for the design strategy. The membrane permeabilizing activities of these AMPs and their prodrugs are reported here for liposomes of either Escherichia coli polar lipid extract or a human model lipid system of phosphatidylcholine and cholesterol. These results are compared with their antibacterial and haemolytic activities. Overall, correlation between liposome permeabilization and the corresponding bioactivity is observed and indicate that the broad-spectrum antibacterial effect exerted by these peptides is associated with membrane disruption. Furthermore, the prodrug modification had a general negative influence on membrane disruption and bioactivity, notably as much on bacterial as on human membranes. This prodrug strategy is particularly successful when complete neutralisation of the AMP's net charge occurs. Thus, on-target selectivity between bacterial and human membranes can be improved, which may be used to prevent the unnecessary exposure of host cells and commensal bacteria to active AMPs.

Place, publisher, year, edition, pages
WILEY , 2018. Vol. 24, no 7, article id e3086
Keywords [en]
antimicrobial peptides, liposomes, membrane permeabilization, prodrugs, therapeutic index
National Category
Pharmaceutical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-362847DOI: 10.1002/psc.3086ISI: 000440144700002PubMedID: 29799150OAI: oai:DiVA.org:uu-362847DiVA, id: diva2:1255689
Conference
7th International Meeting on Antimicrobial Peptides, AUG 25-27, 2017, Univ Copenhagen, Copenhagen, DENMARK
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2018-10-15Bibliographically approved

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Strömstedt, Adam A.

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