151
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Treatment of Pseudomonas aeruginosa Biofilm Present in Endotracheal Tubes by Poly-l-Lysine. Antimicrob Agents Chemother 2018; 62:AAC.00564-18. [PMID: 30104272 DOI: 10.1128/aac.00564-18] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 08/06/2018] [Indexed: 11/20/2022] Open
Abstract
The endotracheal tube (ETT) is an essential interface between the patient and ventilator in mechanically ventilated patients. However, a microbial biofilm is formed gradually on this tube and is associated with the development of ventilator-associated pneumonia. The bacteria present in the biofilm are more resistant to antibiotics, and current medical practices do not make it possible to eliminate. Pseudomonas aeruginosa is one of the leading pathogens that cause biofilm infections and ventilator-associated pneumonia. Poly-l-lysine (pLK) is a cationic polypeptide possessing antibacterial properties and mucolytic activity by compacting DNA. Here, we explored the antibiofilm activity of pLK to treat P. aeruginosa biofilms on ETTs while taking into consideration the necessary constraints for clinical translation in our experimental designs. First, we showed that pLK eradicates a P. aeruginosa biofilm formed in vitro on 96-well microplates. We further demonstrated that pLK alters bacterial membrane integrity, as revealed by scanning electron microscopy, and eventually eradicates biofilm formed either by reference or clinical strains of P. aeruginosa biofilms generated in vitro on ETTs. Second, we collected the ETT from patients with P. aeruginosa ventilator-associated pneumonia. We observed that a single dose of pLK is able to immediately disrupt the biofilm structure and kills more than 90% of bacteria present in the biofilm. Additionally, we did not observe any lung tolerance issue when the pLK solution was instilled into the ETT of ventilated pigs, an animal model particularly relevant to mimic invasive mechanical ventilation in humans. In conclusion, pLK appears as an innovative antibiofilm molecule, which could be applied in the ETT of mechanically ventilated patients.
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152
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Tan Z, Bo T, Guo F, Cui J, Jia S. Effects of ε-Poly-l-lysine on the cell wall of Saccharomyces cerevisiae and its involved antimicrobial mechanism. Int J Biol Macromol 2018; 118:2230-2236. [DOI: 10.1016/j.ijbiomac.2018.07.094] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 07/12/2018] [Accepted: 07/14/2018] [Indexed: 01/08/2023]
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153
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Preparation of ε-polylysine/chitosan nanofibers for food packaging against Salmonella on chicken. Food Packag Shelf Life 2018. [DOI: 10.1016/j.fpsl.2018.06.013] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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154
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Lin L, Gu Y, Li C, Vittayapadung S, Cui H. Antibacterial mechanism of ε -Poly-lysine against Listeria monocytogenes and its application on cheese. Food Control 2018. [DOI: 10.1016/j.foodcont.2018.03.025] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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155
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156
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Truzzolillo D, Sennato S, Sarti S, Casciardi S, Bazzoni C, Bordi F. Overcharging and reentrant condensation of thermoresponsive ionic microgels. SOFT MATTER 2018; 14:4110-4125. [PMID: 29664092 PMCID: PMC5968447 DOI: 10.1039/c7sm02357j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We investigated the complexation of thermoresponsive anionic poly(N-isopropylacrylamide) (PNiPAM) microgels and cationic ε-polylysine (ε-PLL) chains. By combining electrophoresis, light scattering, transmission electron microscopy (TEM) and dielectric spectroscopy (DS) we studied the adsorption of ε-PLL onto microgel networks and its effect on the stability of suspensions. We show that the volume phase transition (VPT) of microgels triggers a large polyion adsorption. Two interesting phenomena with unique features occur: a temperature-dependent microgel overcharging and a complex reentrant condensation. The latter may occur at fixed polyion concentration, when temperature is raised above the VPT of microgels, or by increasing the number density of polycations at fixed temperature. TEM and DS measurements unambiguously show that short PLL chains adsorb onto microgels and act as electrostatic glue above the VPT. By performing thermal cycles, we further show that polyion-induced clustering is a quasi-reversible process: within the time of our experiments large clusters form above the VPT and partially re-dissolve as the mixtures are cooled down. Finally we give a proof that the observed phenomenology is purely electrostatic in nature: an increase of the ionic strength gives rise to polyion desorption from the microgel outer shell.
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Affiliation(s)
- Domenico Truzzolillo
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier , 4 F-34095 Montpellier , France .
| | - Simona Sennato
- CNR-ISC UOS Roma, c/o Dipartimento di Fisica, Sapienza Università di Roma , P.le A. Moro 2 , 00185 Roma , Italy
| | - Stefano Sarti
- Dipartimento di Fisica, Sapienza Università di Roma , P.zzle A. Moro 2 , 00185 Roma , Italy .
| | - Stefano Casciardi
- National Institute for Insurance against Accidents at Work (INAIL Research), Department of Occupational and Environmental Medicine, Epidemiology and Hygiene , Roma , Italy
| | - Chiara Bazzoni
- Dipartimento di Fisica, Sapienza Università di Roma , P.zzle A. Moro 2 , 00185 Roma , Italy .
| | - Federico Bordi
- CNR-ISC UOS Roma, c/o Dipartimento di Fisica, Sapienza Università di Roma , P.le A. Moro 2 , 00185 Roma , Italy
- Dipartimento di Fisica, Sapienza Università di Roma , P.zzle A. Moro 2 , 00185 Roma , Italy .
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157
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Chen XS, Wang KF, Zheng GC, Gao Y, Mao ZG. Preparation, characterization and antimicrobial activity of ε-poly-l-lysine with short chain length produced from glycerol by Streptomyces albulus. Process Biochem 2018. [DOI: 10.1016/j.procbio.2018.03.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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158
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Fürsatz M, Skog M, Sivlér P, Palm E, Aronsson C, Skallberg A, Greczynski G, Khalaf H, Bengtsson T, Aili D. Functionalization of bacterial cellulose wound dressings with the antimicrobial peptide ε-poly-L-Lysine. ACTA ACUST UNITED AC 2018; 13:025014. [PMID: 29047451 DOI: 10.1088/1748-605x/aa9486] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Wound dressings based on bacterial cellulose (BC) can form a soft and conformable protective layer that can stimulate wound healing while preventing bacteria from entering the wound. Bacteria already present in the wound can, however, thrive in the moist environment created by the BC dressing which can aggravate the healing process. Possibilities to render the BC antimicrobial without affecting the beneficial structural and mechanical properties of the material would hence be highly attractive. Here we present methods for functionalization of BC with ε-poly-L-Lysine (ε-PLL), a non-toxic biopolymer with broad-spectrum antimicrobial activity. Low molecular weight ε-PLL was cross-linked in pristine BC membranes and to carboxymethyl cellulose functionalized BC using carbodiimide chemistry. The functionalization of BC with ε-PLL inhibited growth of S. epidermidis on the membranes but did not affect the cytocompatibility to cultured human fibroblasts as compared to native BC. The functionalization had no significant effects on the nanofibrous structure and mechanical properties of the BC. The possibility to functionalize BC with ε-PLL is a promising, green and versatile approach to improve the performance of BC in wound care and other biomedical applications.
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Affiliation(s)
- Marian Fürsatz
- Division of Molecular Physics, Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
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159
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Luz C, Calpe J, Saladino F, Luciano FB, Fernandez‐Franzón M, Mañes J, Meca G. Antimicrobial packaging based on ɛ-polylysine bioactive film for the control of mycotoxigenic fungi in vitro and in bread. J FOOD PROCESS PRES 2018; 42:e13370. [PMID: 29456275 PMCID: PMC5811908 DOI: 10.1111/jfpp.13370] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 03/28/2017] [Accepted: 04/07/2017] [Indexed: 12/01/2022]
Abstract
ɛ-Poly-l-lysine (ɛ-PL) is a cationic peptide with a broad-spectrum antimicrobial activity. This study investigates the use of ɛ-PL as natural antimicrobial to inhibit fungal growth and to reduce aflatoxins (AFs) production. Antifungal activity of starch biofilms with different concentrations of ɛ-Poly-l-lysine (ɛ-PL) was determined in solid medium against Aspergillus parasiticus (AFs producer) and Penicillium expansum. Then, biofilms were tested as antimicrobial devices for the preservation of bread loaf inoculated with A. parasiticus CECT 2681 and P. expansum CECT 2278. Shelf life and AFs content were examined. Biofilms with concentrations of ɛ-PL less than 1.6 mg/cm2 showed no fungal growth inhibition in solid medium, while the antifungal activity of the films with greater than 1.6 mg/cm2 of ɛ-PL was dose dependent. The shelf life of bread inoculated with A. parasiticus was increased by 1 day with the use of films containing 1.6-6.5 mg ɛ-PL/cm2, while shelf life of bread tainted with P. expansum was increased by 3 day with 6.5 mg ɛ-PL/cm2. AFs production was greatly inhibited by ɛ-PL biofilms (93-100%). Thus, ɛ-PL biofilms could be potentially used as antimicrobial device during bread storage as a natural alternative to the synthetic preservatives. Practical applications Ɛ-Polylysin is a natural substance from microbial metabolism. Polylysine has a function to prevent a microbe from proliferating by ionic adsorption in the microbe. ɛ-polylysine has a wide antibacterial spectrum and has an obvious lethal effect on Gram-positive and Gram-negative bacteria, yeast, mold, viruses, etc. It has a good antibacterial effect on the Gram-negative bacteria E. coli and Salmonellae, which are difficult to control with other natural preservatives. ɛ-Polylysine has already been used generally as a food additive in Japan, Korea and other part of world. In the United States, FDA has recognized the polylysine as a GRAS material. Considered the positive results obtained in the study, this compound could be used for the production of antimicrobial biofilms, applied as separator slices in the loaf bread production, to prevent the growth of the mycotoxigenic fungi A. parasiticus and P. expansum, contributing to reduce the use of the synthetically preservatives in bakery industry and also of the negative impact that these compounds could generate on the health of the end users.
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Affiliation(s)
- C. Luz
- Laboratory of Food Chemistry and Toxicology, Faculty of PharmacyUniversity of Valencia, Av. Vicent Andrés Estellés s/nBurjassot, 46100Spain
| | - J. Calpe
- Laboratory of Food Chemistry and Toxicology, Faculty of PharmacyUniversity of Valencia, Av. Vicent Andrés Estellés s/nBurjassot, 46100Spain
| | - F. Saladino
- Laboratory of Food Chemistry and Toxicology, Faculty of PharmacyUniversity of Valencia, Av. Vicent Andrés Estellés s/nBurjassot, 46100Spain
| | - Fernando B. Luciano
- School of Life SciencesPontifícia Universidade Católica do ParanáCuritibaParanáBrasil
| | - M. Fernandez‐Franzón
- Laboratory of Food Chemistry and Toxicology, Faculty of PharmacyUniversity of Valencia, Av. Vicent Andrés Estellés s/nBurjassot, 46100Spain
| | - J. Mañes
- Laboratory of Food Chemistry and Toxicology, Faculty of PharmacyUniversity of Valencia, Av. Vicent Andrés Estellés s/nBurjassot, 46100Spain
| | - G. Meca
- Laboratory of Food Chemistry and Toxicology, Faculty of PharmacyUniversity of Valencia, Av. Vicent Andrés Estellés s/nBurjassot, 46100Spain
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160
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You X, Einson JE, Lopez-Pena CL, Song M, Xiao H, McClements DJ, Sela DA. Food-grade cationic antimicrobial ε-polylysine transiently alters the gut microbial community and predicted metagenome function in CD-1 mice. NPJ Sci Food 2017; 1:8. [PMID: 31304250 PMCID: PMC6550245 DOI: 10.1038/s41538-017-0006-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 06/20/2017] [Accepted: 07/11/2017] [Indexed: 12/19/2022] Open
Abstract
Diet is an important factor influencing the composition and function of the gut microbiome, but the effect of antimicrobial agents present within foods is currently not understood. In this study, we investigated the effect of the food-grade cationic antimicrobial ε-polylysine on the gut microbiome structure and predicted metagenomic function in a mouse model. The relative abundances of predominant phyla and genera, as well as the overall community structure, were perturbed in response to the incorporation of dietary ε-polylysine. Unexpectedly, this modification to the gut microbiome was experienced transiently and resolved to the initial basal composition at the final sampling point. In addition, a differential non-random assembly was observed in the microbiomes characterized from male and female co-housed animals, although their perturbation trajectories in response to diet remain consistent. In conclusion, antimicrobial ε-polylysine incorporated into food systems transiently alters gut microbial communities in mice, as well as their predicted function. This indicates a dynamic but resilient microbiome that adapts to microbial-active dietary components.
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Affiliation(s)
- Xiaomeng You
- Department of Food Science, University of Massachusetts, Amherst, MA 01003 USA
| | - Jonah E. Einson
- Department of Food Science, University of Massachusetts, Amherst, MA 01003 USA
- Commonwealth Honors College, University of Massachusetts, Amherst, MA 01003 USA
| | - Cynthia Lyliam Lopez-Pena
- Department of Food Science, University of Massachusetts, Amherst, MA 01003 USA
- Nestlé Nutrition, 445 State St., Fremont, MI 49413 USA
| | - Mingyue Song
- Department of Food Science, University of Massachusetts, Amherst, MA 01003 USA
| | - Hang Xiao
- Department of Food Science, University of Massachusetts, Amherst, MA 01003 USA
| | | | - David A. Sela
- Department of Food Science, University of Massachusetts, Amherst, MA 01003 USA
- Department of Microbiology, University of Massachusetts, Amherst, MA 01003 USA
- Department of Microbiology & Physiological Systems and Center for Microbiome Research, University of Massachusetts Medical School, Worcester, MA 01655 USA
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161
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Chen M, Fan DM, Li TF, Yan BW, Gao YS, Zhao JX, Zhang H. Synergistic bactericidal effects of basic amino acids and microwave treatment on Escherichia coli. Lebensm Wiss Technol 2017. [DOI: 10.1016/j.lwt.2017.05.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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162
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NP108, an Antimicrobial Polymer with Activity against Methicillin- and Mupirocin-Resistant Staphylococcus aureus. Antimicrob Agents Chemother 2017; 61:AAC.00502-17. [PMID: 28607014 PMCID: PMC5571353 DOI: 10.1128/aac.00502-17] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 06/03/2017] [Indexed: 02/04/2023] Open
Abstract
Staphylococcus aureus is a clinically significant human pathogen that causes infectious diseases ranging from skin and soft tissue infections (SSTI) and health care-associated infections (HAI) to potentially fatal bacteremia and endocarditis. Nasal carriage of S. aureus, especially for persistent carriage, is associated with an increased risk of subsequent infection, particularly nosocomial and surgical site infections (SSI), usually via autoinfection. NP108 is a cationic antimicrobial polymer composed of generally recognized as safe (GRAS) amino acid building blocks. NP108 is broad spectrum and rapidly bactericidal (3-log kill in ≤3 h), killing bacteria by membrane disruption and cell lysis. NP108, contrary to many antibiotics, shows equally effective antimicrobial activity against a variety of S. aureus (MIC100 = 8 to 500 mg/liter) and S. epidermidis (MIC100 = 4 to 8 mg/liter) isolates, whether exponentially growing or in stationary phase. NP108 is antimicrobially active under nutrient-limiting conditions similar to those found in the anterior nares (MIC100 = 8 mg/liter) and kills antibiotic-resilient small colony variants (MIC100 = 32 mg/liter) and S. aureus biofilms (prevention, MIC100 = 1 to 4 mg/liter; eradication, MIC100 ≥ 31.25 mg/liter). NP108 is active against isolates of S. aureus resistant to the current standard-of-care decolonization agent, mupirocin, with no significant increase in the MIC100 NP108 is water soluble and has been formulated into compatible aqueous gel vehicles for human use in which antimicrobial efficacy is retained (2.0% [wt/vol]). NP108 is a potential nonantibiotic antimicrobial alternative to antibiotics for the nasal decolonization of S. aureus, with clear advantages in its mechanism of action over the existing gold standard, mupirocin.
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163
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Optimization of Polyplex Formation between DNA Oligonucleotide and Poly(ʟ-Lysine): Experimental Study and Modeling Approach. Int J Mol Sci 2017. [PMID: 28629130 PMCID: PMC5486112 DOI: 10.3390/ijms18061291] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The polyplexes formed by nucleic acids and polycations have received a great attention owing to their potential application in gene therapy. In our study, we report experimental results and modeling outcomes regarding the optimization of polyplex formation between the double-stranded DNA (dsDNA) and poly(l-Lysine) (PLL). The quantification of the binding efficiency during polyplex formation was performed by processing of the images captured from the gel electrophoresis assays. The design of experiments (DoE) and response surface methodology (RSM) were employed to investigate the coupling effect of key factors (pH and N/P ratio) affecting the binding efficiency. According to the experimental observations and response surface analysis, the N/P ratio showed a major influence on binding efficiency compared to pH. Model-based optimization calculations along with the experimental confirmation runs unveiled the maximal binding efficiency (99.4%) achieved at pH 5.4 and N/P ratio 125. To support the experimental data and reveal insights of molecular mechanism responsible for the polyplex formation between dsDNA and PLL, molecular dynamics simulations were performed at pH 5.4 and 7.4.
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164
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Ushimaru K, Hamano Y, Katano H. Antimicrobial Activity of ε-Poly-l-lysine after Forming a Water-Insoluble Complex with an Anionic Surfactant. Biomacromolecules 2017; 18:1387-1392. [PMID: 28287712 DOI: 10.1021/acs.biomac.7b00109] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
ε-Poly-l-lysine (ε-PL) is one of the few homopoly(amino-acid)s occurring in nature. ε-PL, which possesses multiple amino groups, is highly soluble in water, where it forms the antimicrobial polycationic chain (PLn+). Although the high water-solubility is advantageous for the use of ε-PL as a food preservative, it has limited the applicability of ε-PL as a biopolymer plastic. Here, we report on the preparation and availability of a water-insoluble complex formed with PLn+ and an anionic surfactant, bis(2-ethylhexyl) sulfosuccinate (BEHS-, is also commercialized as AOT) anion. The PLn+/BEHS--complex, which is soluble in organic solvents, was successfully used as a coating material for a cellulose acetate membrane to create a water-resistant antimicrobial membrane. In addition, the thermoplastic PLn+/BEHS--complex was able to be uniformly mixed with polypropylene by heating, resulting in materials exhibiting antimicrobial activities.
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Affiliation(s)
- Kazunori Ushimaru
- Department of Bioscience, Fukui Prefectural University , 4-1-1 Matsuoka-Kenjojima, Eiheiji-cho, Yoshida-gun, Fukui 910-1195, Japan
| | - Yoshimitsu Hamano
- Department of Bioscience, Fukui Prefectural University , 4-1-1 Matsuoka-Kenjojima, Eiheiji-cho, Yoshida-gun, Fukui 910-1195, Japan
| | - Hajime Katano
- Department of Bioscience, Fukui Prefectural University , 4-1-1 Matsuoka-Kenjojima, Eiheiji-cho, Yoshida-gun, Fukui 910-1195, Japan
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165
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Huang S, Guild B, Neethirajan S, Therrien P, Lim LT, Warriner K. Antimicrobial coatings for controlling Listeria monocytogenes based on polylactide modified with titanium dioxide and illuminated with UV-A. Food Control 2017. [DOI: 10.1016/j.foodcont.2016.08.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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166
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Wang L, Hu C, Shao L. The antimicrobial activity of nanoparticles: present situation and prospects for the future. Int J Nanomedicine 2017; 12:1227-1249. [PMID: 28243086 PMCID: PMC5317269 DOI: 10.2147/ijn.s121956] [Citation(s) in RCA: 1577] [Impact Index Per Article: 225.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Nanoparticles (NPs) are increasingly used to target bacteria as an alternative to antibiotics. Nanotechnology may be particularly advantageous in treating bacterial infections. Examples include the utilization of NPs in antibacterial coatings for implantable devices and medicinal materials to prevent infection and promote wound healing, in antibiotic delivery systems to treat disease, in bacterial detection systems to generate microbial diagnostics, and in antibacterial vaccines to control bacterial infections. The antibacterial mechanisms of NPs are poorly understood, but the currently accepted mechanisms include oxidative stress induction, metal ion release, and non-oxidative mechanisms. The multiple simultaneous mechanisms of action against microbes would require multiple simultaneous gene mutations in the same bacterial cell for antibacterial resistance to develop; therefore, it is difficult for bacterial cells to become resistant to NPs. In this review, we discuss the antibacterial mechanisms of NPs against bacteria and the factors that are involved. The limitations of current research are also discussed.
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Affiliation(s)
- Linlin Wang
- Department of Stomatology, Hainan General Hospital, Haikou, Hainan
| | - Chen Hu
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, People’s Republic of China
| | - Longquan Shao
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, People’s Republic of China
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167
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Guo L, Meng Y, Fang S. Physicochemical and antimicrobial properties of ε-polylysine/carboxymethyl chitosan polyelectrolyte complexes and their effect against spoilage microorganisms in raw pork. Food Funct 2017; 8:2243-2248. [DOI: 10.1039/c7fo00279c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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168
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169
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Zouhir A, Taieb M, Lamine MA, Cherif A, Jridi T, Mahjoubi B, Mbarek S, Fliss I, Nefzi A, Sebei K, Ben Hamida J. ANTISTAPHYBASE: database of antimicrobial peptides (AMPs) and essential oils (EOs) against methicillin-resistant Staphylococcus aureus (MRSA) and Staphylococcus aureus. Arch Microbiol 2016; 199:215-222. [DOI: 10.1007/s00203-016-1293-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 08/24/2016] [Accepted: 09/20/2016] [Indexed: 01/01/2023]
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170
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Gallagher AG, Alorabi JA, Wellings DA, Lace R, Horsburgh MJ, Williams RL. A Novel Peptide Hydrogel for an Antimicrobial Bandage Contact Lens. Adv Healthc Mater 2016; 5:2013-8. [PMID: 27276231 DOI: 10.1002/adhm.201600258] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 04/05/2016] [Indexed: 12/20/2022]
Abstract
A peptide hydrogel with an antimicrobial activity is developed as a bandage contact lens. The antimicrobial activity is enhanced with the addition of the biomolecules penicillin G or poly-ε-lysine and is positive against Staphylococcus aureus and Escherichia coli. The lens is also noncytotoxic toward a human corneal epithelial cell line and as a consequence is of great potential as a drug-eluting bandage lens replacing conventional corneal ulcer treatment.
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Affiliation(s)
- Andrew G Gallagher
- Institute of Ageing and Chronic Diseases, Department of Eye and Vision Science, University of Liverpool, Apex Building, West Derby Street, Liverpool, L7 8TX, UK
- SpheriTech Ltd, The Heath Business and Technical Park, Runcorn, Cheshire, WA7 4QX, UK
| | - Jamal A Alorabi
- Institute of Integrative Biology, University of Liverpool, Biosciences Building, Crown Street, Liverpool, L69 7ZB, UK
| | - Donald A Wellings
- SpheriTech Ltd, The Heath Business and Technical Park, Runcorn, Cheshire, WA7 4QX, UK
| | - Rebecca Lace
- Institute of Ageing and Chronic Diseases, Department of Eye and Vision Science, University of Liverpool, Apex Building, West Derby Street, Liverpool, L7 8TX, UK
| | - Mal J Horsburgh
- Institute of Integrative Biology, University of Liverpool, Biosciences Building, Crown Street, Liverpool, L69 7ZB, UK
| | - Rachel L Williams
- Institute of Ageing and Chronic Diseases, Department of Eye and Vision Science, University of Liverpool, Apex Building, West Derby Street, Liverpool, L7 8TX, UK
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171
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Stenvang M, Christiansen G, Otzen DE. Epigallocatechin Gallate Remodels Fibrils of Lattice Corneal Dystrophy Protein, Facilitating Proteolytic Degradation and Preventing Formation of Membrane-Permeabilizing Species. Biochemistry 2016; 55:2344-57. [DOI: 10.1021/acs.biochem.6b00063] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Marcel Stenvang
- Interdisciplinary
Nanoscience Center
(iNANO), Department of Molecular Biology and Genetics, Center for
Insoluble Protein Structures (inSPIN), Aarhus University, Aarhus, Denmark
| | | | - Daniel E. Otzen
- Interdisciplinary
Nanoscience Center
(iNANO), Department of Molecular Biology and Genetics, Center for
Insoluble Protein Structures (inSPIN), Aarhus University, Aarhus, Denmark
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172
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Wang C, Zolotarskaya OY, Nair SS, Ehrhardt CJ, Ohman DE, Wynne KJ, Yadavalli VK. Real-Time Observation of Antimicrobial Polycation Effects on Escherichia coli: Adapting the Carpet Model for Membrane Disruption to Quaternary Copolyoxetanes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2975-2984. [PMID: 26948099 DOI: 10.1021/acs.langmuir.5b04247] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Real-time atomic force microscopy (AFM) was used for analyzing effects of the antimicrobial polycation copolyoxetane P[(C12)-(ME2Ox)-50/50], C12-50 on the membrane of a model bacterium, Escherichia coli (ATCC# 35218). AFM imaging showed cell membrane changes with increasing C12-50 concentration and time including nanopore formation and bulges associated with outer bacterial membrane disruption. A macroscale bactericidal concentration study for C12-50 showed a 4 log kill at 15 μg/mL with conditions paralleling imaging (1 h, 1x PBS, physiological pH, 25 °C). The dramatic changes from the control image to 1 h after introducing 15 μg/mL C12-50 are therefore reasonably attributed to cell death. At the highest concentration (60 μg/mL) further cell membrane disruption results in leakage of cytoplasm driven by detergent-like action. The sequence of processes for initial membrane disruption by the synthetic polycation C12-50 follows the carpet model posited for antimicrobial peptides (AMPs). However, the nanoscale details are distinctly different as C12-50 is a synthetic, water-soluble copolycation that is best modeled as a random coil. In a complementary AFM study, chemical force microscopy shows that incubating cells with C12-50 decreased the hydrophobicity across the entire cell surface at an early stage. This finding provides additional evidence indicating that C12-50 polycations initially bind with the cell membrane in a carpet-like fashion. Taken together, real time AFM imaging elucidates the mechanism of antimicrobial action for copolyoxetane C12-50 at the single cell level. In future work this approach will provide important insights into structure-property relationships and improved antimicrobial effectiveness for synthetic amphiphilic polycations.
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Affiliation(s)
- Congzhou Wang
- Department of Chemical and Life Science Engineering and ‡Department of Forensic Science, Virginia Commonwealth University , Richmond, Virginia 23284, United States
- Department of Microbiology and Immunology and ∥McGuire Veterans Affairs Medical Center, VCU School of Medicine , Richmond, Virginia 23249, United States
| | - Olga Y Zolotarskaya
- Department of Chemical and Life Science Engineering and ‡Department of Forensic Science, Virginia Commonwealth University , Richmond, Virginia 23284, United States
- Department of Microbiology and Immunology and ∥McGuire Veterans Affairs Medical Center, VCU School of Medicine , Richmond, Virginia 23249, United States
| | - Sithara S Nair
- Department of Chemical and Life Science Engineering and ‡Department of Forensic Science, Virginia Commonwealth University , Richmond, Virginia 23284, United States
- Department of Microbiology and Immunology and ∥McGuire Veterans Affairs Medical Center, VCU School of Medicine , Richmond, Virginia 23249, United States
| | - Christopher J Ehrhardt
- Department of Chemical and Life Science Engineering and ‡Department of Forensic Science, Virginia Commonwealth University , Richmond, Virginia 23284, United States
- Department of Microbiology and Immunology and ∥McGuire Veterans Affairs Medical Center, VCU School of Medicine , Richmond, Virginia 23249, United States
| | - Dennis E Ohman
- Department of Chemical and Life Science Engineering and ‡Department of Forensic Science, Virginia Commonwealth University , Richmond, Virginia 23284, United States
- Department of Microbiology and Immunology and ∥McGuire Veterans Affairs Medical Center, VCU School of Medicine , Richmond, Virginia 23249, United States
| | - Kenneth J Wynne
- Department of Chemical and Life Science Engineering and ‡Department of Forensic Science, Virginia Commonwealth University , Richmond, Virginia 23284, United States
- Department of Microbiology and Immunology and ∥McGuire Veterans Affairs Medical Center, VCU School of Medicine , Richmond, Virginia 23249, United States
| | - Vamsi K Yadavalli
- Department of Chemical and Life Science Engineering and ‡Department of Forensic Science, Virginia Commonwealth University , Richmond, Virginia 23284, United States
- Department of Microbiology and Immunology and ∥McGuire Veterans Affairs Medical Center, VCU School of Medicine , Richmond, Virginia 23249, United States
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173
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Hyldgaard M, Meyer RL, Peng M, Hibberd AA, Fischer J, Sigmundsson A, Mygind T. Binary combination of epsilon-poly-l-lysine and isoeugenol affect progression of spoilage microbiota in fresh turkey meat, and delay onset of spoilage in Pseudomonas putida challenged meat. Int J Food Microbiol 2015; 215:131-42. [DOI: 10.1016/j.ijfoodmicro.2015.09.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2015] [Revised: 09/07/2015] [Accepted: 09/21/2015] [Indexed: 12/22/2022]
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174
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Liu F, Liu M, Du L, Wang D, Geng Z, Zhang M, Sun C, Xu X, Zhu Y, Xu W. Synergistic Antibacterial Effect of the Combination of ε-Polylysine and Nisin against Enterococcus faecalis. J Food Prot 2015; 78:2200-6. [PMID: 26613915 DOI: 10.4315/0362-028x.jfp-15-220] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This study evaluated the antibacterial effect of the combination of ε-polylysine (ε-PL) and nisin against Enterococcus faecalis strains. The combination of ε-PL and nisin showed synergistic antibacterial activity against three Enterococcus strains. Scanning electron microscopy and a membrane permeability assay revealed that the combined treatment with ε-PL and nisin synergistically damaged the cell morphology of E. faecalis strain R612Z1 cells. Both ε-PL and nisin can dissipate the transmembrane electric potential of E. faecalis R612Z1 cells, but these peptides did not affect the transmembrane pH gradient. The combination of ε-PL and nisin can produce a high reactive oxygen species level in E. faecalis R612Z1 cells. The results indicated that the uptake of ε-PL into cells was promoted through nisin and that the combination of ε-PL and nisin could produce a high reactive oxygen species level in E. faecalis R612Z1 cells, leading to cell growth inhibition.
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Affiliation(s)
- Fang Liu
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China
| | - Mei Liu
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China; College of Food Science, Northeast Agricultural University, Harbin 150030, People's Republic of China
| | - Lihui Du
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210046, People's Republic of China
| | - Daoying Wang
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China
| | - Zhiming Geng
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China
| | - Muhan Zhang
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China
| | - Chong Sun
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China
| | - Xiaoxi Xu
- College of Food Science, Northeast Agricultural University, Harbin 150030, People's Republic of China.
| | - Yongzhi Zhu
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China
| | - Weimin Xu
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People's Republic of China
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175
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Hegab HM, ElMekawy A, Barclay TG, Michelmore A, Zou L, Saint CP, Ginic-Markovic M. Fine-Tuning the Surface of Forward Osmosis Membranes via Grafting Graphene Oxide: Performance Patterns and Biofouling Propensity. ACS APPLIED MATERIALS & INTERFACES 2015; 7:18004-18016. [PMID: 26214126 DOI: 10.1021/acsami.5b04818] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Graphene oxide (GO) nanosheets were attached to the polyamide selective layer of thin film composite (TFC) forward osmosis (FO) membranes through a poly L-Lysine (PLL) intermediary using either layer-by-layer or hybrid (H) grafting strategies. Fourier transform infrared spectroscopy, zeta potential, and thermogravimetric analysis confirmed the successful attachment of GO/PLL, the surface modification enhancing both the hydrophilicity and smoothness of the membrane's surface demonstrated by water contact angle, atomic force microscopy, and transmission electron microscopy. The biofouling resistance of the FO membranes determined using an adenosine triphosphate bioluminescence test showed a 99% reduction in surviving bacteria for GO/PLL-H modified membranes compared to pristine membrane. This antibiofouling property of the GO/PLL-H modified membrane was reflected in reduced flux decline compared to all other samples when filtering brackish water under biofouling conditions. Further, the high density and tightly bound GO nanosheets using the hybrid modification reduced the reverse solute flux compared to the pristine, which reflects improved membrane selectivity. These results illustrate that the GO/PLL-H modification is a valuable addition to improve the performance of FO TFC membranes.
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Affiliation(s)
- Hanaa M Hegab
- †Centre for Water Management and Reuse, University of South Australia, Adelaide SA 5095, Australia
- ‡Institute of Advanced Technology and New Materials, City of Scientific Research and Technological Applications, Borg Elarab, Alexandria, Egypt
| | - Ahmed ElMekawy
- §Genetic Engineering and Biotechnology Research Institute, University of Sadat City (USC), Sadat City, Egypt
- ∥School of Chemical Engineering, University of Adelaide, Adelaide SA 5095, Australia
| | - Thomas G Barclay
- ⊥Mawson Institute, University of South Australia, Adelaide, SA 5095, Australia
| | - Andrew Michelmore
- ⊥Mawson Institute, University of South Australia, Adelaide, SA 5095, Australia
| | - Linda Zou
- †Centre for Water Management and Reuse, University of South Australia, Adelaide SA 5095, Australia
- #Department of Chemical and Environmental Engineering, Masdar Institute of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Christopher P Saint
- †Centre for Water Management and Reuse, University of South Australia, Adelaide SA 5095, Australia
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176
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Issa R, Meikle ST, James S, Cooper IR. Poly(ε-lysine) dendrons as modulators of quorum sensing in Pseudomonas aeruginosa. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:176. [PMID: 25893386 DOI: 10.1007/s10856-015-5508-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 03/30/2015] [Indexed: 06/04/2023]
Abstract
The opportunistic pathogen Pseudomonas aeruginosa is a significant contributor to recalcitrant multi-drug resistant infections. In a vigorous search for alternative therapeutic approaches, the communication system used by this bacterium to synchronise the expression of genes involved in pathogenicity has been identified as a potential target. Poly(ε-lysine) dendrons, composed of three branching generations, were examined herein for their anti-virulence potential and ability to disperse within P. a eruginosa biofilms. These hyperbranched macromolecules reduced attachment and biomass production under different nutrient growth conditions, and at concentrations that were not lethal to planktonic cells (0.2, 0.4 and 0.8 mg/mL). Fluorescent labelling revealed the intracellular localisation and cell-penetrating capacity of the dendron, and showed the rapid uptake and release of unexploited dendron from pre-established P. a eruginosa biofilms. Additionally, the dendron induced complete attenuation of LasA protease, a marker of quorum sensing inactivation, by preventing its accumulation in the external environment. This study thus demonstrates the anti-virulence potential of this class of macromolecules, and could represent a novel therapeutic approach for the treatment of antibiotic-resistant P. a eruginosa infections.
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Affiliation(s)
- Rahaf Issa
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Huxley Building, Lewes Road, Brighton, BN2 4GJ, UK,
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