Overview: The global spread of antibiotic resistance represents a serious threat for public health. Aim: We evaluated the efficacy of the antimicrobial peptide LL-37 as antimicrobial agent against multidrug-resistant Escherichia coli. Results: LL-37 showed good activity against mcr-1 carrying, extended spectrum beta-lactamase- and carbapenemase-producing E. coli (minimum inhibitory concentration, MIC, from 16 to 64mg/l). Checkerboard assays demonstrated synergistic effect of LL-37/colistin combination against all tested strains, further confirmed by time-kill and post antibiotic effect assays. MIC and sub-MIC concentrations of LL-37 were able to reduce biofilm formation. Conclusion: Our preliminary data indicated that LL-37/colistin combination was effective against multidrug resistant E. coli strains and suggested a new possible clinical application.

Synergistic effect of antimicrobial peptide LL-37 and colistin combination against multidrug-resistant Escherichia coli isolates

Morroni, Gianluca;Simonetti, Oriana
;
Brescini, Lucia;Mingoia, Marina;Brenciani, Andrea;Giovanetti, Eleonora;Bagnarelli, Patrizia;Giacometti, Andrea;Cirioni, Oscar
2021

Abstract

Overview: The global spread of antibiotic resistance represents a serious threat for public health. Aim: We evaluated the efficacy of the antimicrobial peptide LL-37 as antimicrobial agent against multidrug-resistant Escherichia coli. Results: LL-37 showed good activity against mcr-1 carrying, extended spectrum beta-lactamase- and carbapenemase-producing E. coli (minimum inhibitory concentration, MIC, from 16 to 64mg/l). Checkerboard assays demonstrated synergistic effect of LL-37/colistin combination against all tested strains, further confirmed by time-kill and post antibiotic effect assays. MIC and sub-MIC concentrations of LL-37 were able to reduce biofilm formation. Conclusion: Our preliminary data indicated that LL-37/colistin combination was effective against multidrug resistant E. coli strains and suggested a new possible clinical application.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11566/288297
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