Kinetics Study of Antimicrobial Peptide, Melittin, in Simultaneous Biofilm Degradation and Eradication of Potent Biofilm Producing MDR Pseudomonas aeruginosa Isolates
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Biofilm associated Pseudomonas aeruginosa infections are of major clinical concern due to treatment failure by conventional antibiotics. Referring to many reports, antimicrobial peptides (AMPs) would be act as a new promising agent to overcome the issue. In this regard, our study was aimed to evaluate the kinetics of melittin as a natural AMP, in simultaneously degrading and killing potent biofilm producing multidrug-resistant (MDR) P. aeruginosa isolates. The sensitivity of P. aeruginosa clinical isolates against routinely prescribed antibiotics was evaluated using disc diffusion and micro-dilution broth methods. Biofilm formation ability of the isolates was determined by colorimetric method. The biofilm formation kinetics was evaluated in five highly biofilm producer MDR isolates during 48 h. The efficiency of melittin to degradation of biofilm biomass and killing the bacteria within the biofilm were kinetically performed. The degradation activity of melittin on preformed biofilm and also its effect on the morphology of P. aeruginosa within the biofilm was investigated by field emission-scanning electron microscopy (FE-SEM). Melittin at the amount of 2 and 4 µg inhibited or killed all the examined strains in planktonic state while at 50 µg degraded the biofilm layer and killed all embedded bacteria after 24 and 48 h, respectively. FE-SEM results confirmed the biofilm removal and killing activities of melittin. Linear regression analysis verified the trend of melittin’s activities in a concentration and time dependent manner. In conclusion, it seems plausible that melittin should be further investigated in an animal model of biofilm associated burn infection as a new drug lead.
KeywordsAntimicrobial peptides Biofilm degradation Pseudomonas aeruginosa Melittin
This investigation is a part of the Ph.D. thesis of Reyhaneh Shams Khozani, approved by Faculty of Sciences, Karaj Branch, Islamic Azad University, Karaj, Iran and Pasteur Institute of Iran, Tehran-Iran.
RSK performed all experiments and also contributed in writing the manuscript. DS, NH, and MMF contributed as advisor. KPB contributed in experimental design, writing and redaction of the manuscript and also supervised the project. The idea for application of melittin in removing the P. aeruginosa associated biofilm and killing the embedded bacteria belongs to the corresponding author, KPB.
Compliance with Ethical Standards
Conflict of interest
Reyhaneh Shams Khozani, Delavar Shahbazzadeh, Naser Harzandi, Mohammad Mehdi Feizabadi, and Kamran Pooshang Bagheri declare that they have no conflict of interest.
Research involving Human and Animal Participants
This article does not contain studies with human participants or animals performed by any of the authors.
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