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Review
. 2019 Nov 18;40(6):488-505.
doi: 10.24272/j.issn.2095-8137.2019.062.

Antimicrobial peptides: new hope in the war against multidrug resistance

Affiliations
Review

Antimicrobial peptides: new hope in the war against multidrug resistance

James Mwangi et al. Zool Res. .

Abstract

The discovery of antibiotics marked a golden age in the revolution of human medicine. However, decades later, bacterial infections remain a global healthcare threat, and a return to the pre-antibiotic era seems inevitable if stringent measures are not adopted to curb the rapid emergence and spread of multidrug resistance and the indiscriminate use of antibiotics. In hospital settings, multidrug resistant (MDR) pathogens, including carbapenem-resistant Pseudomonas aeruginosa, vancomycin-resistant enterococci (VRE), methicillin-resistant Staphylococcus aureus (MRSA), and extended-spectrum β-lactamases (ESBL) bearing Acinetobacter baumannii, Escherichia coli, and Klebsiella pneumoniae are amongst the most problematic due to the paucity of treatment options, increased hospital stay, and exorbitant medical costs. Antimicrobial peptides (AMPs) provide an excellent potential strategy for combating these threats. Compared to empirical antibiotics, they show low tendency to select for resistance, rapid killing action, broad-spectrum activity, and extraordinary clinical efficacy against several MDR strains. Therefore, this review highlights multidrug resistance among nosocomial bacterial pathogens and its implications and reiterates the importance of AMPs as next-generation antibiotics for combating MDR superbugs.

Keywords: Antibiotic alternatives; Antimicrobial peptide; Multidrug resistance; Nosocomial infections.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Figure 1
Figure 1. Number of natural and synthetic antimicrobial peptides from different kingdoms (total 3 011) as of July 2019
Data obtained from antimicrobial peptide database http://aps.unmc.edu/AP/ (Wang et al., 2016).
Figure 2
Figure 2. Structural diversity and helical wheel projections of representative AMPs
A: α-helical-magainin (PDB ID 2LSA). B: β-sheet-chicken ovo-defensin (PDB ID 2MJK). C: Extended coil-tritrpticin. Images were created with Protein Data Bank (PDP) (Bioinformaticsdoi:10.1093/bioinformatics/bty419) (Rose et al., 2018) and visualized with Jmol software. D: Helical wheel projections of four representative peptides showing physical properties canonical to all AMPs, including distribution of amino acid residues, net charge, and hydrophobicity established to correlate with antimicrobial activity, selectivity, and cytotoxicity. Positively charged residues (polar) are represented as blue circles and hydrophobic (nonpolar) residues are yellow circles. Wheels projections, net charge, and hydrophobicity of AMPs were generated with HeliQuest webserver (http://heliquest.ipmc. cnrs.fr/).
Figure 3
Figure 3. Schematic of membrane disruptive and non-membrane disruptive bacterial killing mechanisms of AMPs
Illustration created with BIORENDER.COM.

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