Synergistic and antibiofilm properties of ocellatin peptides against multidrug-resistant Pseudomonas aeruginosa

Bessa, Lucinda J; Eaton, Peter; Dematei, Anderson; Plácido, Alexandra; Vale, Nuno; Gomes, Paula; Delerue-Matos, Cristina; Leite, José Roberto Sá; Gameiro, Paula

http://hdl.handle.net/10400.22/14762

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Authors

Plácido, Alexandra

Delerue-Matos, Cristina

Leite, José Roberto Sá

Gameiro, Paula

Abstract(s)

Aim:To test ocellatin peptides (ocellatins-PT2-PT6) for antibacterial and antibiofilm activities and synergy with antibiotics against Pseudomonas aeruginosa. Materials & methods: Normal- and checkerboard-broth microdilution methods were used. Biofilm studies included microtiter plate-based assays and microscopic analysis by confocal laser scanning microscopy and atomic force microscopy. Results: Ocellatins were more active against multidrug-resistant isolates of P. aeruginosa than against susceptible strains. Ocellatin-PT3 showed synergy with ciprofloxacin and ceftazidime against multidrug-resistant isolates and was capable of preventing the proliferation of 48-h mature biofilms at concentrations ranging from 4 to 8× the MIC. Treated biofilms had low viability and were slightly more disaggregated. Conclusion: Ocellatin-PT3 may be promising as a template for the development of novel antimicrobial peptides against P. aeruginosa.