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Fast killing kinetics, significant therapeutic index, and high stability of melittin-derived antimicrobial peptide
Reza Akbari1, Mojdeh Hakemi Vala2, Jean-Marc Sabatier3
1Department of Microbiology, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, West Azerbaijan, Iran.
Abstract:
The emergence of multidrug-resistant (MDR) bacteria is a major challenge for antimicrobial chemotherapy. Concerning this issue, antimicrobial peptides (AMPs) have been presented as novel promising antibiotics. Our previous de novo designed melittin-derived peptides (MDP1 and MDP2) indicated their potential as peptide drug leads. Accordingly, this study was aimed to evaluate the kinetics of activity, toxicity, and stability of MDP1 and MDP2 as well as determination of their structures. The killing kinetics of MDP1 and MDP2 demonstrate that all bacterial strains were rapidly killed. MDP1 and MDP2 were ca. 100- and 26.6-fold less hemolytic than melittin and found to be respectively 72.9- and 41.6-fold less cytotoxic than melittin on the HEK293 cell line. MDP1 and MDP2 showed 252- and 132-fold improvement in their therapeutic index in comparison to melittin. MDP1 and MDP2 sustained their activities in the presence of human plasma and were found to be ca. four to eightfold more stable than melittin. Spectropolarimetry analysis of MDP1 and MDP2 indicates that the peptides adopt an alpha-helical structure predominantly. According to the fast killing kinetics, significant therapeutic index, and high stability of MDP1, it could be considered as a drug lead in a mouse model of septicemia infections.
Insights
Melittin-derived peptides (MDP1 and MDP2) show rapid bacterial killing and improved stability. These novel antimicrobial peptides (AMPs) offer reduced toxicity and enhanced therapeutic potential compared to melittin.
Area of Science:
- Biochemistry
- Microbiology
- Drug Discovery
Background:
- Multidrug-resistant (MDR) bacteria pose a significant threat to antimicrobial chemotherapy.
- Antimicrobial peptides (AMPs) are emerging as promising antibiotic alternatives.
- Previous research identified de novo designed melittin-derived peptides (MDP1 and MDP2) as potential drug leads.
Purpose of the Study:
- To evaluate the activity kinetics, toxicity, and stability of MDP1 and MDP2.
- To determine the structural characteristics of MDP1 and MDP2.
- To assess the therapeutic potential of MDP1 and MDP2 as novel antibiotics.
Main Methods:
- Kinetic assays to determine bacterial killing rates.
- Hemolysis and cytotoxicity assays using HEK293 cell line.
- Stability assays in human plasma.
- Spectropolarimetry for structural analysis.
Main Results:
- MDP1 and MDP2 exhibited rapid killing of bacterial strains.
- MDP1 and MDP2 demonstrated significantly lower hemolytic and cytotoxic effects compared to melittin.
- MDP1 and MDP2 showed substantial improvements in therapeutic index and stability.
- Spectropolarimetry confirmed predominantly alpha-helical structures for MDP1 and MDP2.
Conclusions:
- MDP1 and MDP2 possess favorable properties for development as novel antimicrobial agents.
- MDP1, with its fast killing kinetics, high therapeutic index, and stability, is a promising drug lead for septicemia infections.
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