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Synergistic interactions between antimicrobial peptides derived from plectasin and lipid nanocapsules containing monolaurin as a cosurfactant against Staphylococcus aureus

Authors Umerska A, Cassisa V, Bastiat G, Matougui N, Nehme H, Manero F, Eveillard M, Saulnier P

Received 13 April 2017

Accepted for publication 2 June 2017

Published 8 August 2017 Volume 2017:12 Pages 5687—5699


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Thomas Webster

Anita Umerska,1 Viviane Cassisa,2 Guillaume Bastiat,1 Nada Matougui,1 Hassan Nehme,1 Florence Manero,3 Matthieu Eveillard,4 Patrick Saulnier1

1MINT, UNIV Angers, INSERM 1066, CNRS 6021, Université Bretagne Loire, Angers, Cedex, France; 2Laboratoire de bactériologie, CHU Angers, France; 3SCIAM (Service Commun d’Imagerie et d’Analyses Microscopiques), Angers, France; 4Equipe ATIP AVENIR, CRCINA, Inserm, Université de Nantes, Université d’Angers, Angers, France

Abstract: Development of effective antibacterial agents for the treatment of infections caused by Gram-positive bacteria resistant to existing antibiotics, such as methicillin-resistant Staphylococcus aureus (MRSA), is an area of intensive research. In this work, the antibacterial efficacy of two antimicrobial peptides derived from plectasin, AP114 and AP138, used alone and in combination with monolaurin-lipid nanocapsules (ML-LNCs) was evaluated. Several interesting findings emerged from the present study. First, ML-LNCs and both plectasin derivatives showed potent activity against all 14 tested strains of S. aureus, independent of their resistance phenotype. Both peptides displayed a considerable adsorption (33%–62%) onto ML-LNCs without having an important impact on the particle properties such as size. The combinations of peptide with ML-LNC displayed synergistic effect against S. aureus, as confirmed by two methods: checkerboard and time-kill assays. This synergistic interaction enables a dose reduction and consequently decreases the risk of toxicity and has the potential of minimizing the development of resistance. Together, these results suggest that ML-LNCs loaded with a plectasin derivative may be a very promising drug delivery system for further development as a novel antibacterial agent against S. aureus, including MRSA.

Keywords: nanoparticles, antimicrobial peptides, glycerol monolaurate, synergy, antibiotic resistance, MRSA, methicillin-resistant Staphylococcus aureus

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