1
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Mandal S, Patra D, Mandal S, Das GK, Sahoo P. Insights into colistin-mediated fluorescence labelling of bacterial LPS. RSC Adv 2024; 14:2770-2777. [PMID: 38234867 PMCID: PMC10792355 DOI: 10.1039/d3ra07107c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 01/03/2024] [Indexed: 01/19/2024] Open
Abstract
Gram-negative bacterial infections are becoming untreatable due to their ability to mutate, and the gradual development of their resistance to the available antimicrobials. In recent times colistin, a drug of last resort, started losing its efficacy towards multidrug-resistant bacterial infections. Colistin targets bacterial endotoxin lipopolysaccharides (LPS) and destabilises the cytoplasmic membrane by disrupting the outer LPS membrane. In this study, we have tried to label the bacterial LPS, the main constituent of the cytoplasmic membrane of bacterial cells, to try to understand the interaction mechanism of LPS with colistin. The chemosensor, naphthaldehyde appended furfural (NAF) that selectively recognises colistin can label LPS, by showing its fluorescence signals. The computationally derived three-dimensional structure of LPS has been introduced to speculate on the possible binding mode of colistin with LPS, and this was also thoroughly studied with the help of quantum mechanics and molecular dynamics energy minimisation. Fluorescence microscopy and FE-SEM microscopic studies were also used to observe the change in the structural morphology of colistin-sensitive and resistant Salmonella typhi in different experimental conditions.
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Affiliation(s)
- Saurodeep Mandal
- Department of Chemistry, Siksha Bhavana, Visva-Bharati Santiniketan 731235 West Bengal India
| | - Dipanwita Patra
- Department of Microbiology, University of Calcutta Kolkata 700019 West Bengal India
| | - Sukhendu Mandal
- Department of Microbiology, University of Calcutta Kolkata 700019 West Bengal India
| | - Gourab Kanti Das
- Department of Chemistry, Siksha Bhavana, Visva-Bharati Santiniketan 731235 West Bengal India
| | - Prithidipa Sahoo
- Department of Chemistry, Siksha Bhavana, Visva-Bharati Santiniketan 731235 West Bengal India
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2
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Ji X, Yang X, Shi C, Guo D, Wang X, Messina JM, Meng Q, Urao N, Cooney R, Luo J. Functionalized core-shell nanogel scavenger for immune modulation therapy in sepsis. ADVANCED THERAPEUTICS 2022; 5:2200127. [PMID: 36590645 PMCID: PMC9797201 DOI: 10.1002/adtp.202200127] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Indexed: 01/05/2023]
Abstract
Sepsis is a complex, life-threatening hyperinflammatory syndrome associated with organ failure and high mortality due to lack of effective treatment options. Here we report a core-shell hydrogel nanoparticle with the core functionalized with telodendrimer (TD) nanotrap (NT) to control hyperinflammation in sepsis. The combination of multi-valent charged and hydrophobic moieties in TD enables effective binding with biomolecules in NT. The higher crosslinking in the shell structure of nanogel excludes the abundant large serum proteins and allows for size-selectivity in scavenging the medium-sized septic molecules (10-30 kDa), e.g., lipopolysaccharides (LPS, a potent endotoxin in sepsis), thus reducing cytokine production. At the same time, the core-shell TD NT nanogel captures the over-flowing proinflammatory cytokines effectively both in vitro and in vivo from biological fluids to further control hyperinflammation. Intraperitoneal injection of core-shell TD NT nanogel effectively attenuates NF-κB activation and cytokine production in LPS-induced septic mouse models. These results indicate the potential applications of the injectable TD NT core-shell nanogel to attenuate local or systemic inflammation.
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Affiliation(s)
- Xiaotian Ji
- Department of Pharmacology, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
| | - Xiguang Yang
- Department of Pharmacology, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
| | - Changying Shi
- Department of Pharmacology, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
| | - Dandan Guo
- Department of Pharmacology, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
| | - Xiaojing Wang
- Department of Pharmacology, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
| | - Jennifer M Messina
- Department of Pharmacology, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
| | - Qinghe Meng
- Department of Surgery, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
| | - Norifumi Urao
- Department of Pharmacology, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
- Upstate Sepsis Interdisciplinary Research Center, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
| | - Robert Cooney
- Department of Pharmacology, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
- Department of Surgery, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
- Upstate Sepsis Interdisciplinary Research Center, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
| | - Juntao Luo
- Department of Pharmacology, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
- Department of Surgery, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
- Upstate Cancer Center, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
- Upstate Sepsis Interdisciplinary Research Center, State University of New York Upstate Medical University, Syracuse, NY 13210, United States
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3
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Atomic-Resolution Structures and Mode of Action of Clinically Relevant Antimicrobial Peptides. Int J Mol Sci 2022; 23:ijms23094558. [PMID: 35562950 PMCID: PMC9100274 DOI: 10.3390/ijms23094558] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/18/2022] [Accepted: 04/18/2022] [Indexed: 02/01/2023] Open
Abstract
Global rise of infections and deaths caused by drug-resistant bacterial pathogens are among the unmet medical needs. In an age of drying pipeline of novel antibiotics to treat bacterial infections, antimicrobial peptides (AMPs) are proven to be valid therapeutics modalities. Direct in vivo applications of many AMPs could be challenging; however, works are demonstrating encouraging results for some of them. In this review article, we discussed 3-D structures of potent AMPs e.g., polymyxin, thanatin, MSI, protegrin, OMPTA in complex with bacterial targets and their mode of actions. Studies on human peptide LL37 and de novo-designed peptides are also discussed. We have focused on AMPs which are effective against drug-resistant Gram-negative bacteria. Since treatment options for the infections caused by super bugs of Gram-negative bacteria are now extremely limited. We also summarize some of the pertinent challenges in the field of clinical trials of AMPs.
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4
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Paracini N, Schneck E, Imberty A, Micciulla S. Lipopolysaccharides at Solid and Liquid Interfaces: Models for Biophysical Studies of the Gram-negative Bacterial Outer Membrane. Adv Colloid Interface Sci 2022; 301:102603. [PMID: 35093846 DOI: 10.1016/j.cis.2022.102603] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 01/14/2022] [Accepted: 01/15/2022] [Indexed: 11/18/2022]
Abstract
Lipopolysaccharides (LPSs) are a constitutive element of the cell envelope of Gram-negative bacteria, representing the main lipid in the external leaflet of their outer membrane (OM) lipid bilayer. These unique surface-exposed glycolipids play a central role in the interactions of Gram-negative organisms with their surrounding environment and represent a key element for protection against antimicrobials and the development of antibiotic resistance. The biophysical investigation of a wide range of different types of in vitro model membranes containing reconstituted LPS has revealed functional and structural properties of these peculiar membrane lipids, providing molecular-level details of their interaction with antimicrobial compounds. LPS assemblies reconstituted at interfaces represent a versatile tool to study the properties of the Gram-negative OM by exploiting several surface-sensitive techniques, in particular X-ray and neutron scattering, which can probe the structure of thin films with sub-nanometer resolution. This review provides an overview of different approaches employed to investigate structural and biophysical properties of LPS, focusing on studies on Langmuir monolayers of LPS at the air/liquid interface and a range of supported LPS-containing model membranes reconstituted at solid/liquid interfaces.
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Affiliation(s)
| | - Emanuel Schneck
- Physics Departent, Technische Universität Darmstadt, Darmstadt, Germany
| | - Anne Imberty
- Université Grenoble Alpes, CNRS, CERMAV, Grenoble, France
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5
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Hong L, Gontsarik M, Amenitsch H, Salentinig S. Human Antimicrobial Peptide Triggered Colloidal Transformations in Bacteria Membrane Lipopolysaccharides. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2104211. [PMID: 34825488 DOI: 10.1002/smll.202104211] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 09/29/2021] [Indexed: 06/13/2023]
Abstract
Growing concerns of bacterial resistance against conventional antibiotics shifts the research focus toward antimicrobial peptide (AMP)-based materials. Most AMPs kill gram-negative bacteria by destroying their inner membrane, but have to first pass the outer membrane covered with lipopolysaccharides (LPS). Their interplay with the LPS is crucial for bactericidal activity, but is yet to be elucidated in detail. In this study, self-assemblies of Escherichia coli LPS with the human cathelicidin AMP LL-37, free and encapsulated into glyceryl monooleate (GMO) lipid nanoparticles, are analyzed using synchrotron small angle X-ray scattering, dynamic light scattering, and cryogenic transmission electron microscopy. Circular dichroism spectroscopy is used to study modifications in LL-37's secondary structure. LPS is found to form elongated micelles and the addition of LL-37 induces their transformation to multilamellar structures. LPS' addition to GMO cubosomes triggers the swelling of the internal cubic structure, while in multilamellar GMO/LL-37 nanocarriers it causes transitions into unstructured particles. The insights on the interactions among LPS and LL-37, in its free form or encapsulated in GMO dispersions, may guide the design of LPS-responsive antimicrobial nanocarriers. The findings may further assist the formulation of antimicrobial nanomaterials with enhanced penetration of LPS layers for improved destruction of bacterial membranes.
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Affiliation(s)
- Linda Hong
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, Fribourg, 1700, Switzerland
| | - Mark Gontsarik
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, Fribourg, 1700, Switzerland
| | - Heinz Amenitsch
- Institute for Inorganic Chemistry, Graz University of Technology, Stremayergasse 9/V, Graz, 8010, Austria
| | - Stefan Salentinig
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, Fribourg, 1700, Switzerland
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6
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The Engineered Antibiotic Peptide PLG0206 Eliminates Biofilms and Is a Potential Treatment for Periprosthetic Joint Infections. Antibiotics (Basel) 2021; 11:antibiotics11010041. [PMID: 35052918 PMCID: PMC8772972 DOI: 10.3390/antibiotics11010041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/13/2021] [Accepted: 12/27/2021] [Indexed: 11/17/2022] Open
Abstract
Antimicrobial peptides (AMPs) have recently gained attention for their potential to treat diseases related to bacterial and viral infections, as many traditional antimicrobial drugs have reduced efficacy in treating these infections due to the increased prevalence of drug-resistant pathogens. PLG0206, an engineered cationic antibiotic peptide that is 24 residues long, has been designed to address some limitations of other natural AMPs, such as toxicity and limited activity due to pH and ion concentrations. Nonclinical studies have shown that PLG0206 is highly selective for targeting bacterial cells and is not toxic to human blood cells. Antibiofilm experiments demonstrated that PLG0206 is effective at reducing both biotic and abiotic biofilm burdens following direct biofilm contact. PLG0206 has rapid and broad-spectrum activity against both Gram-positive and Gram-negative bacteria that are implicated as etiologic agents in periprosthetic joint infections, including multidrug-resistant ESKAPE pathogens and colistin-resistant isolates. A recent first-in-human study demonstrated that PLG0206 is well tolerated and safe as an intravenous infusion in healthy volunteers. Studies are planned to determine the efficacy of PLG0206 in patients for the treatment of periprosthetic joint infections. This review summarizes the chemistry, pharmacology, and microbiology of PLG0206 and explores its current preclinical, clinical, and regulatory status.
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7
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Weerakoon D, Petrov K, Pedebos C, Khalid S. Polymyxin B1 within the E. coli cell envelope: insights from molecular dynamics simulations. Biophys Rev 2021; 13:1061-1070. [PMID: 35047090 PMCID: PMC8724489 DOI: 10.1007/s12551-021-00869-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 10/22/2021] [Indexed: 11/25/2022] Open
Abstract
Polymyxins are used as last-resort antibiotics, where other treatments have been ineffectual due to antibiotic resistance. However, resistance to polymyxins has also been now reported, therefore it is instructive to characterise at the molecular level, the mechanisms of action of polymyxins. Here we review insights into these mechanisms from molecular dynamics simulations and discuss the utility of simulations as a complementary technique to experimental methodologies.
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Affiliation(s)
| | - Kamen Petrov
- Hertford College, University of Oxford, Oxford, OX1 3BW UK
| | - Conrado Pedebos
- School of Chemistry, University of Southampton, Southampton, SO17 1BJ UK
- Department of Biochemistry, University of Oxford, Oxford, OX1 3QU UK
| | - Syma Khalid
- School of Chemistry, University of Southampton, Southampton, SO17 1BJ UK
- Department of Biochemistry, University of Oxford, Oxford, OX1 3QU UK
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8
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Kim KH, Yang M, Song Y, Kim CH, Jung YM, Bae NH, Chang SJ, Lee SJ, Kim YT, Choi BG, Lee KG. Touchable 3D hierarchically structured polyaniline nanoweb for capture and detection of pathogenic bacteria. NANO CONVERGENCE 2021; 8:30. [PMID: 34633558 PMCID: PMC8505581 DOI: 10.1186/s40580-021-00280-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 09/16/2021] [Indexed: 06/01/2023]
Abstract
A bacteria-capturing platform is a critical function of accurate, quantitative, and sensitive identification of bacterial pathogens for potential usage in the detection of foodborne diseases. Despite the development of various nanostructures and their surface chemical modification strategies, relative to the principal physical contact propagation of bacterial infections, mechanically robust and nanostructured platforms that are available to capture bacteria remain a significant problem. Here, a three-dimensional (3D) hierarchically structured polyaniline nanoweb film is developed for the efficient capture of bacterial pathogens by hand-touching. This unique nanostructure ensures sufficient mechanical resistance when exposed to compression and shear forces and facilitates the 3D interfacial interactions between bacterial extracellular organelles and polyaniline surfaces. The bacterial pathogens (Escherichia coli O157:H7, Salmonella enteritidis, and Staphylococcus aureus) are efficiently captured through finger-touching, as verified by the polymerase chain reaction (PCR) analysis. Moreover, the real-time PCR results of finger-touched cells on a 3D nanoweb film show a highly sensitive detection of bacteria, which is similar to those of the real-time PCR using cultured cells without the capturing step without any interfering of fluorescence signal and structural deformation during thermal cycling.
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Affiliation(s)
- Kyung Hoon Kim
- Department of Bioengineering, University of Washington, Seattle, WA, 98195-5061, USA
| | - MinHo Yang
- Department of Energy Engineering, Dankook University, Cheonan, 31116, Republic of Korea
| | - Younseong Song
- Center for Nano Bio Development, National Nanofab Center (NNFC), Daejeon, 34141, Republic of Korea
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Chi Hyun Kim
- Center for Nano Bio Development, National Nanofab Center (NNFC), Daejeon, 34141, Republic of Korea
| | - Young Mee Jung
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Nam-Ho Bae
- Center for Nano Bio Development, National Nanofab Center (NNFC), Daejeon, 34141, Republic of Korea
| | - Sung-Jin Chang
- Center for Analysis and Evaluation, National Nanofab Center (NNFC), Daejeon, 34141, Republic of Korea
| | - Seok Jae Lee
- Center for Nano Bio Development, National Nanofab Center (NNFC), Daejeon, 34141, Republic of Korea
| | - Yong Tae Kim
- Department of Chemical Engineering & Biotechnology, Korea Polytechnic University, Siheung-si, 15073, Republic of Korea.
| | - Bong Gill Choi
- Department of Chemical Engineering, Kangwon National University, Samcheok, 25913, Republic of Korea.
| | - Kyoung G Lee
- Center for Nano Bio Development, National Nanofab Center (NNFC), Daejeon, 34141, Republic of Korea.
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9
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Vitkov L, Muñoz LE, Knopf J, Schauer C, Oberthaler H, Minnich B, Hannig M, Herrmann M. Connection between Periodontitis-Induced Low-Grade Endotoxemia and Systemic Diseases: Neutrophils as Protagonists and Targets. Int J Mol Sci 2021; 22:4647. [PMID: 33925019 PMCID: PMC8125370 DOI: 10.3390/ijms22094647] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/22/2021] [Accepted: 04/26/2021] [Indexed: 12/11/2022] Open
Abstract
Periodontitis is considered a promoter of many systemic diseases, but the signaling pathways of this interconnection remain elusive. Recently, it became evident that certain microbial challenges promote a heightened response of myeloid cell populations to subsequent infections either with the same or other pathogens. This phenomenon involves changes in the cell epigenetic and transcription, and is referred to as ''trained immunity''. It acts via modulation of hematopoietic stem and progenitor cells (HSPCs). A main modulation driver is the sustained, persistent low-level transmission of lipopolysaccharide from the periodontal pocket into the peripheral blood. Subsequently, the neutrophil phenotype changes and neutrophils become hyper-responsive and prone to boosted formation of neutrophil extracellular traps (NET). Cytotoxic neutrophil proteases and histones are responsible for ulcer formations on the pocket epithelium, which foster bacteremia and endoxemia. The latter promote systemic low-grade inflammation (SLGI), a precondition for many systemic diseases and some of them, e.g., atherosclerosis, diabetes etc., can be triggered by SLGI alone. Either reverting the polarized neutrophils back to the homeostatic state or attenuation of neutrophil hyper-responsiveness in periodontitis might be an approach to diminish or even to prevent systemic diseases.
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Affiliation(s)
- Ljubomir Vitkov
- Vascular & Exercise Biology Unit, Department of Biosciences, University of Salzburg, 5020 Salzburg, Austria; (L.V.); (H.O.); (B.M.)
- Clinic of Operative Dentistry, Periodontology and Preventive Dentistry, Saarland University, 66424 Homburg, Germany
| | - Luis E. Muñoz
- Department of Internal Medicine 3—Rheumatology and Immunology, Universitätsklinikum Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (L.E.M.); (J.K.); (C.S.); (M.H.)
| | - Jasmin Knopf
- Department of Internal Medicine 3—Rheumatology and Immunology, Universitätsklinikum Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (L.E.M.); (J.K.); (C.S.); (M.H.)
| | - Christine Schauer
- Department of Internal Medicine 3—Rheumatology and Immunology, Universitätsklinikum Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (L.E.M.); (J.K.); (C.S.); (M.H.)
| | - Hannah Oberthaler
- Vascular & Exercise Biology Unit, Department of Biosciences, University of Salzburg, 5020 Salzburg, Austria; (L.V.); (H.O.); (B.M.)
| | - Bernd Minnich
- Vascular & Exercise Biology Unit, Department of Biosciences, University of Salzburg, 5020 Salzburg, Austria; (L.V.); (H.O.); (B.M.)
| | - Matthias Hannig
- Clinic of Operative Dentistry, Periodontology and Preventive Dentistry, Saarland University, 66424 Homburg, Germany
| | - Martin Herrmann
- Department of Internal Medicine 3—Rheumatology and Immunology, Universitätsklinikum Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (L.E.M.); (J.K.); (C.S.); (M.H.)
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10
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Antibiofilm peptides as a promising strategy: comparative research. Appl Microbiol Biotechnol 2021; 105:1647-1656. [PMID: 33475795 DOI: 10.1007/s00253-021-11103-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 12/04/2020] [Accepted: 01/05/2021] [Indexed: 10/22/2022]
Abstract
Biofilms lead to approximately 65% of infections, and these infections are hard to treat. Thus, it is crucial to identify effective antibiofilm agents with low cytotoxicity. Peptides with antibiofilm activity have been regarded as promising solutions, and peptides with MBICs (minimal biofilm inhibitory concentrations) that are lower than their minimal inhibitory concentration (MICs) (minimal inhibitory concentrations) are appealing. Therefore, we systematically summarized and classified previously reported peptides with antibiofilm activity. A total of 51 peptides with antibiofilm activity were classified into 14 categories. The MICs and MBICs of these fourteen representative peptides, one selected from each category, were compared against the Gram-positive bacterium Streptococcus mutans, the Gram-negative bacterium Pseudomonas aeruginosa, and the fungus Candida albicans. Six representative peptides (C5-pleurocidin, C6-Pac-525, C9-protegrin-1, C11-TetraF2W-RR, C13-WLBU2, and C14-melittin) showed antibiofilm activity against both bacteria and fungi, and among these 6 representative peptides, 4 peptides (C9-protegrin-1, C11-TetraF2W-RR, C13-WLBU2, and C14-melittin) could prevent biofilm formation with lower MBIC values than their MICs. CLSM (confocal laser scanning microscopy), SEM (scanning electron microscopy), and TEM (transmission electron microscopy) were further used to observe the morphologies of the biofilms after treatment with the peptides. Among the above 4 peptides, WLBU2 and melittin sparsely scattered the biofilms without destroying the bacteria. In conclusion, the currently reported peptides with antibiofilm activity are limited in number, but peptides with lower MBICs than MICs exist as promising candidates against biofilm-related infections and need further study. KEY POINTS: • Antibiofilm peptides could inhibit biofilm formation with MBICs that are lower than MICs. • The mechanism of antibiofilm peptides is not only due to antimicrobial activity.
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11
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Razdan S, Adler J, Barua D, Barua S. Multifunctional Biofilter to Effectively Remove Toxins. ACS APPLIED BIO MATERIALS 2021. [DOI: 10.1021/acsabm.0c01282] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Peng X, Yan X, Zhu L, Gu Y, Sun Z, Zhan X. Preparation of polymyxin B-loaded gellan-polylysine polyion complex fibers with high affinity to endotoxin. Int J Biol Macromol 2020; 160:703-710. [PMID: 32497663 DOI: 10.1016/j.ijbiomac.2020.05.263] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 05/29/2020] [Indexed: 02/04/2023]
Abstract
Endotoxemia, a life-threatening disease affecting people worldwide, can be treated by hemoperfusion alone. New hemoperfusion materials with high biocompatibility and endotoxin-combination ability are always in demand. Herein, polymyxin B (PMB), a specific endotoxin binding molecule, was loaded onto gellan-polylysine polyion complex, and the obtained material was used in preparing wet-spun fibers. The tensile strength of the as-spun yarns (100 fibers) ranged from 1.49 N to -1.58 N and that of the dried and rewetted yarns ranged from 1.45 N to 1.56 N. The adsorption ability of the fibers with lipopolysaccharides from E. coli was 2.784 ± 0.036 EU/mg in simulated human body fluid and 2.452 ± 0.107 EU/mg in mouse plasma. The fibers showed no cytotoxicity toward U2OS cells and no hemolysis toward mouse blood. The influence of the fibers on the clotting time of mouse blood was negligible, and the blood cells were not adhesive to the fibers. Thus, the PMB-loaded gellan-polylysine complex fiber and its derivate fabrics can be used in hemoperfusion.
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Affiliation(s)
- Xingqiao Peng
- Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Xingyue Yan
- Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Li Zhu
- Wuxi Galaxy Biotech Co., Ltd., Wuxi, Jiangsu 214125, China
| | - Yiran Gu
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, China
| | - Zhenglong Sun
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, China
| | - Xiaobei Zhan
- Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China.
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13
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Deslouches B, Montelaro RC, Urish KL, Di YP. Engineered Cationic Antimicrobial Peptides (eCAPs) to Combat Multidrug-Resistant Bacteria. Pharmaceutics 2020; 12:pharmaceutics12060501. [PMID: 32486228 PMCID: PMC7357155 DOI: 10.3390/pharmaceutics12060501] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/25/2020] [Accepted: 05/27/2020] [Indexed: 12/12/2022] Open
Abstract
The increasing rate of antibiotic resistance constitutes a global health crisis. Antimicrobial peptides (AMPs) have the property to selectively kill bacteria regardless of resistance to traditional antibiotics. However, several challenges (e.g., reduced activity in the presence of serum and lack of efficacy in vivo) to clinical development need to be overcome. In the last two decades, we have addressed many of those challenges by engineering cationic AMPs de novo for optimization under test conditions that typically inhibit the activities of natural AMPs, including systemic efficacy. We reviewed some of the most promising data of the last two decades in the context of the advancement of the field of helical AMPs toward clinical development.
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Affiliation(s)
- Berthony Deslouches
- Department of Environmental and Occupational Health, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA 15261, USA;
- Correspondence: ; Tel.: +1-412-624-0103
| | - Ronald C. Montelaro
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA;
| | - Ken L. Urish
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA;
| | - Yuanpu P. Di
- Department of Environmental and Occupational Health, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA 15261, USA;
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14
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Photocatalytically renewable peptide-based electrochemical impedance method for sensing lipopolysaccharide. Mikrochim Acta 2020; 187:349. [PMID: 32462256 DOI: 10.1007/s00604-020-04321-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 05/14/2020] [Indexed: 10/24/2022]
Abstract
A peptide (Li5-025)-modified gold nanoparticle (AuNP)/(titania (TiO2) + 5,10,15,20-tetrakis(4-aminophenyl)-21H,23H-porphine (TAPP))/glassy carbon electrode (GCE) was developed for lipopolysaccharide (LPS) determination. This electrode not only performs well in the electrochemical impedance determination of LPS in serum but can also be easily regenerated under light irradiation. Using Fe(CN)63-/4- as a redox probe, LPS recognition can be indicated by the significantly increased electron-transfer resistance (Ret) as a result of the coaction of the increased steric hindrance from the peptide-LPS complex and the electrostatic repulsion between LPS and Fe(CN)63-/4-. The impedimetric signal was acquired in the frequency range 0.1 Hz ~ 100 kHz with an initial voltage of 174 mV and an amplitude of 10 mV. The resistance changes (ΔRet) are linearly related to the LPS concentrations in a broad range (0.1 pg mL-1 ~ 100 ng mL-1) with a low detection limit (0.08 pg mL-1). Importantly, the electrode shows high selectivity to LPS from Escherichia coli O55:B5 compared to other bacterial sources and considerable anti-interference to 0.1% fetal calf serum, demonstrating its potential application in clinically relevant samples. Another highlight is that the AuNP/(TiO2 + TAPP)/GCE surface can be photocatalytically regenerated under light irradiation (50 mW cm-2, 300-2500 nm) without any obvious damage to the electrode microstructure. After simple peptide re-immobilization, the regenerated electrode demonstrates LPS response similar to the peptide less one, and the deviation is only 2.89% after 5-cycle reuse. Graphical abstract A peptide (Li5-025)-modified AuNP/(TiO2 + TAPP porphine)/GCE was proposed, which not only has excellent electrochemical analytical performances for LPS assay in serum but also can be reused after light irradiation and subsequent peptide re-immobilization.
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Schneier M, Razdan S, Miller AM, Briceno ME, Barua S. Current technologies to endotoxin detection and removal for biopharmaceutical purification. Biotechnol Bioeng 2020; 117:2588-2609. [PMID: 32333387 DOI: 10.1002/bit.27362] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 04/20/2020] [Accepted: 04/22/2020] [Indexed: 12/21/2022]
Abstract
Endotoxins are the major contributors to the pyrogenic response caused by contaminated pharmaceutical products, formulation ingredients, and medical devices. Recombinant biopharmaceutical products are manufactured using living organisms, including Gram-negative bacteria. Upon the death of a Gram-negative bacterium, endotoxins (also known as lipopolysaccharides) in the outer cell membrane are released into the lysate where they can interact with and form bonds with biomolecules, including target therapeutic compounds. Endotoxin contamination of biologic products may also occur through water, raw materials such as excipients, media, additives, sera, equipment, containers closure systems, and expression systems used in manufacturing. The manufacturing process is, therefore, in critical need of methods to reduce and remove endotoxins by monitoring raw materials and in-process intermediates at critical steps, in addition to final drug product release testing. This review paper highlights a discussion on three major topics about endotoxin detection techniques, upstream processes for the production of therapeutic molecules, and downstream processes to eliminate endotoxins during product purification. Finally, we have evaluated the effectiveness of endotoxin removal processes from a perspective of high purity and low cost.
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Affiliation(s)
- Mason Schneier
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri
| | - Sidharth Razdan
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri
| | - Allison M Miller
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri
| | - Maria E Briceno
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri
| | - Sutapa Barua
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri
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16
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Madhumanchi S, Suedee R, Kaewpiboon S, Srichana T, Khalil R, Ul-Haq Z. Effect of sodium deoxycholate sulfate on outer membrane permeability and neutralization of bacterial lipopolysaccharides by polymyxin B formulations. Int J Pharm 2020; 581:119265. [PMID: 32217155 DOI: 10.1016/j.ijpharm.2020.119265] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 03/03/2020] [Accepted: 03/23/2020] [Indexed: 12/12/2022]
Abstract
We demonstrated binding interactions of polymyxin B (PMB), PMB formulations in the mole ratios of 1:2 and 1:3 of PMB:sodium deoxycholate sulfate (SDCS) and a commercial PMB formulation (CPMB) with lipopolysaccharides (LPS). The 1:2 PMB formulation (78.5-135.2 nM) exhibited a lower number of binding sites to the tested LPS compared to CPMB (112.6-140.9 nM) whereas 1:3 PMB formulation exhibited a higher number of binding sites (143.9-340.2 nM). Similarly, in the presence of LPS, the 1:2 PMB formulation (163.8-221.4 nm) exhibited smaller particle sizes compared to PMB, CPMB and 1:3 PMB formulation (248.8-603.5 nm). Molecular docking simulation suggested that the fatty acyl tails of LPS wrap together to produce a pseudo-globular structure of PMB-LPS complex, and among those 1:2 PMB formulation formed a more stable structure. The primary forces behind this complex are hydrogen bonds and salt bridges among the LPS, PMB, and SDCS. This study revealed that the PMB, CPMB, and PMB formulations inserted into the LPS micelles to disrupt the LPS membrane, whereas the SDCS may induce aggregation. The 1:2 PMB formulation also had higher bacterial uptake than other PMB formulations. The 1:2 PMB formulation neutralized the LPS micelles and was effective against Escherichia coli and Pseudomonas aeruginosa.
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Affiliation(s)
- Sreenu Madhumanchi
- Drug Delivery System Excellence Center, Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand; Molecular Recognition Materials Research Unit, Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Roongnapa Suedee
- Molecular Recognition Materials Research Unit, Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Sunisa Kaewpiboon
- Drug Delivery System Excellence Center, Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Teerapol Srichana
- Drug Delivery System Excellence Center, Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand.
| | - Ruqaiya Khalil
- Computational Drug Design Lab, Dr. Panjwani Center for Molecular Medicine and Drug, Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Zaheer Ul-Haq
- Computational Drug Design Lab, Dr. Panjwani Center for Molecular Medicine and Drug, Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
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Galvidis IA, Eremin SA, Burkin MA. Development of indirect competitive enzyme-linked immunoassay of colistin for milk and egg analysis. FOOD AGR IMMUNOL 2020. [DOI: 10.1080/09540105.2020.1733935] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Inna A. Galvidis
- I. Mechnikov Research Institute for Vaccines and Sera, Moscow, Russia
| | - Sergei A. Eremin
- Faculty of Chemistry, M. V. Lomonosov Moscow State University, Moscow, Russia
| | - Maksim A. Burkin
- I. Mechnikov Research Institute for Vaccines and Sera, Moscow, Russia
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18
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Enhancing biocompatibility and neuronal anti-inflammatory activity of polymyxin B through conjugation with gellan gum. Int J Biol Macromol 2019; 147:734-740. [PMID: 31883895 DOI: 10.1016/j.ijbiomac.2019.12.200] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 10/03/2019] [Accepted: 12/22/2019] [Indexed: 12/13/2022]
Abstract
Polymyxins, as strong antibiotics with high liposaccharide deactivation abilities, are rarely used as neuronal anti-inflammatory agent because of their high cytotoxicity. In this study, polymyxin B (PMB) was conjugated with deacylated gellan gum for the sustained release of PMB to reduce its cytotoxicity at high concentration without affecting the antibacterial and liposaccharide binding activities. For the conjugate of original PMB/GN ratio of 1.0 (GPC), the conjugating rate was 96.40%, and the releasing ratio of PMB was 30.12% within 60 h. The FT-IR spectra of GPC indicated that the amino groups of PMB were covalently bonded with the COOH groups of gellan and other PMB molecules. Most GPCs were micelle shaped regardless of whether they were under dry conditions or in an aqueous solution. The inhibition zones of PMB against Escherichia coli and Pseudomonas aeruginosa were small, but the half maximal inhibitory concentration value against BV-2 cells increased from 15.63 μg/mL to 2000.00 μg/mL after conjugation. GPC can also effectively depress the liposaccharide-stimulated overexpression of cytotoxic nitric oxide by BV-2 cells. This study revealed the possibility of using polymyxins for neuronal anti-inflammation and that this gellan/PMB conjugate can potentially be applied to wound healing and implants.
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19
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Dong N, Wang C, Li X, Guo Y, Li X. Simplified Head-to-Tail Cyclic Polypeptides as Biomaterial-Associated Antimicrobials with Endotoxin Neutralizing and Anti-Inflammatory Capabilities. Int J Mol Sci 2019; 20:ijms20235904. [PMID: 31775224 PMCID: PMC6928678 DOI: 10.3390/ijms20235904] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 11/15/2019] [Accepted: 11/20/2019] [Indexed: 12/21/2022] Open
Abstract
The therapeutic application of antimicrobial peptides (AMPs), a potential type of peptide-based biomaterial, is impeded by their poor antimicrobial activity and potential cytotoxicity as a lack of understanding of their structure–activity relationships. In order to comprehensively enhance the antibacterial and clinical application potency of AMPs, a rational approach was applied to design amphiphilic peptides, including head-to-tail cyclic, linear and D-proline antimicrobial peptides using the template (IR)nP(IR)nP (n = 1, 2 and 3). Results showed that these amphiphilic peptides demonstrated antimicrobial activity in a size-dependent manner and that cyclic peptide OIR3, which contained three repeating units (IR)3, had greater antimicrobial potency and cell selectivity than liner peptide IR3, DIR3 with D-Pro and gramicidin S (GS). Surface plasmon resonance and endotoxin neutralization assays indicated that OIR3 had significant endotoxin neutralization capabilities, which suggested that the effects of OIR3 were mediated by binding to lipopolysaccharides (LPS). Using fluorescence spectrometry and electron microscopy, we found that OIR3 strongly promoted membrane disruption and thereby induced cell lysis. In addition, an LPS-induced inflammation assay showed that OIR3 inhibited the pro-inflammatory factor TNF-α in RAW264.7 cells. OIR3 was able to reduce oxazolone-induced skin inflammation in allergic dermatitis mouse model via the inhibition of TNF-α, IL-1β and IL-6 mRNA expression. Collectively, the engineered head-to-tail cyclic peptide OIR3 was considerable potential candidate for use as a clinical therapeutic for the treatment of bacterial infections and skin inflammation.
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Affiliation(s)
- Na Dong
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China; (N.D.); (C.W.); (X.L.)
| | - Chensi Wang
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China; (N.D.); (C.W.); (X.L.)
| | - Xinran Li
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China; (N.D.); (C.W.); (X.L.)
| | - Yuming Guo
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
- Correspondence: ; Tel.: +(86-010)-6273-3900
| | - Xiaoli Li
- Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science, Northeast Forestry University, Harbin 150040, China;
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20
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Madhumanchi S, Suedee R, Nakpheng T, Tinpun K, Temboot P, Srichana T. Binding interactions of bacterial lipopolysaccharides to polymyxin B in an amphiphilic carrier 'sodium deoxycholate sulfate'. Colloids Surf B Biointerfaces 2019; 182:110374. [PMID: 31330430 DOI: 10.1016/j.colsurfb.2019.110374] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 07/15/2019] [Accepted: 07/16/2019] [Indexed: 12/19/2022]
Abstract
This work presents the outcomes of a comparative study of molecular interactions of polymyxin B (PMB) and F12 and F13 formulations in the mole ratios of 1:2 and 1:3 of PMB:sodium deoxycholate sulfate (SDCS), respectively, and a commercial PMB formulation (CPMB) with lipopolysaccharides (LPS). Several spectroscopic and interfacial studies were performed to obtain LPS-peptide interactions at a molecular level. The fluorescence titrimetry method revealed that the F12 formulation (325 nM) exhibited a lower number of binding sites to the LPS compared to CPMB and F13 as well as PMB alone (537 nM). Similarly, in the presence of LPS, the F12 formulation (88 nm) exhibited smaller particle sizes in the dynamic light scattering study compared to PMB (116 nm), CPMB, and the F13 formulation. An interfacial study and circular dichroism spectroscopy revealed PMB and CPMB insertion into the LPS micelles to destabilize and disrupt the LPS membrane, whereas the F12 and F13 formulations may induce pseudo-aggregation. The NMR and IR studies showed that the presence of SDCS, the hydrophobicity of PMB increased by hydrogen bonding and electrostatic interactions and formed stabilized PMB-SDCS micelles. The PMB-SDCS formulation is likely to release PMB for easy penetration into the lipid membrane and cause disruption of the complex LPS micelles. Furthermore, the PMB-SDCS formulations neutralized and detoxified the LPS micelles with minimal toxicity to normal kidney tubular cells as well as an immortalised kidney cell line. The antimicrobial properties of PMBloaded SDCS nanomicelles were effective against a resistant strain of Pseudomonas aeruginosa.
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Affiliation(s)
- Sreenu Madhumanchi
- Drug Delivery System Excellence Center, Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand; Molecular Recognition Materials Research Unit, Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Roongnapa Suedee
- Molecular Recognition Materials Research Unit, Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Titpawan Nakpheng
- Drug Delivery System Excellence Center, Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Kittiya Tinpun
- Drug Delivery System Excellence Center, Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Pornvichai Temboot
- Drug Delivery System Excellence Center, Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Teerapol Srichana
- Drug Delivery System Excellence Center, Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand.
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Razdan S, Wang JC, Barua S. PolyBall: A new adsorbent for the efficient removal of endotoxin from biopharmaceuticals. Sci Rep 2019; 9:8867. [PMID: 31222053 PMCID: PMC6586805 DOI: 10.1038/s41598-019-45402-w] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 06/06/2019] [Indexed: 01/20/2023] Open
Abstract
The presence of endotoxin, also known as lipopolysaccharides (LPS), as a side product appears to be a major drawback for the production of certain biomolecules that are essential for research, pharmaceutical, and industrial applications. In the biotechnology industry, gram-negative bacteria (e.g., Escherichia coli) are widely used to produce recombinant products such as proteins, plasmid DNAs and vaccines. These products are contaminated with LPS, which may cause side effects when administered to animals or humans. Purification of LPS often suffers from product loss. For this reason, special attention must be paid when purifying proteins aiming a product as free as possible of LPS with high product recovery. Although there are a number of methods for removing LPS, the question about how LPS removal can be carried out in an efficient and economical way is still one of the most intriguing issues and has no satisfactory solution yet. In this work, polymeric poly-ε-caprolactone (PCL) nanoparticles (NPs) (dP = 780 ± 285 nm) were synthesized at a relatively low cost and demonstrated to possess sufficient binding sites for LPS adsorption and removal with ~100% protein recovery. The PCL NPs removed greater than 90% LPS from protein solutions suspended in water using only one milligram (mg) of NPs, which was equivalent to ~1.5 × 106 endotoxin units (EU) per mg of particle. The LPS removal efficacy increased to a higher level (~100%) when phosphate buffered saline (PBS containing 137 mM NaCl) was used as a protein suspending medium in place of water, reflecting positive effects of increasing ionic strength on LPS binding interactions and adsorption. The results further showed that the PCL NPs not only achieved 100% LPS removal but also ~100% protein recovery for a wide concentration range from 20-1000 μg/ml of protein solutions. The NPs were highly effective in different buffers and pHs. To scale up the process further, PCL NPs were incorporated into a supporting cellulose membrane which promoted LPS adsorption further up to ~100% just by running the LPS-containing water through the membrane under gravity. Its adsorption capacity was 2.8 × 106 mg of PCL NPs, approximately 2 -fold higher than that of NPs alone. This is the first demonstration of endotoxin separation with high protein recovery using polymer NPs and the NP-based portable filters, which provide strong adsorptive interactions for LPS removal from protein solutions. Additional features of these NPs and membranes are biocompatible (environment friendly) recyclable after repeated elution and adsorption with no significant changes in LPS removal efficiencies. The results indicate that PCL NPs are an effective LPS adsorbent in powder and membrane forms, which have great potential to be employed in large-scale applications.
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Affiliation(s)
- Sidharth Razdan
- Department of Chemical and Biochemical Engineering Missouri University of Science and Technology, Rolla, MO, 65409, USA
| | - Jee-Ching Wang
- Department of Chemical and Biochemical Engineering Missouri University of Science and Technology, Rolla, MO, 65409, USA
| | - Sutapa Barua
- Department of Chemical and Biochemical Engineering Missouri University of Science and Technology, Rolla, MO, 65409, USA.
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Saporito P, Biljana M, Løbner Olesen A, Jenssen H. Antibacterial mechanisms of GN-2 derived peptides and peptoids against Escherichia coli. Biopolymers 2019; 110:e23275. [PMID: 30951211 DOI: 10.1002/bip.23275] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 03/08/2019] [Accepted: 03/12/2019] [Indexed: 12/30/2022]
Abstract
Escherichia coli is the main etiological agent of urinary trait infections, able to form biofilms in indwelling devices, resulting in chronic infections which are refractory to antibiotics treatment. In this study, we investigated the antimicrobial and anti-biofilm properties exerted against E. coli ATCC 25922, by a set of peptoids and peptides modeled upon the peptide GN-2, previously reported as a valid antimicrobial agent. The putative antimicrobials were designed to evaluate the effect of cationicity, hydrophobicity and their partitioning on the overall properties against planktonic cells and biofilms as well as on LPS binding, permeabilization of Gram-negative bacteria membranes and hemolysis. The data demonstrated that peptides are stronger antimicrobials than the analogue peptoids which in return have superior anti-biofilm properties. In this study, we present evidence that peptides antimicrobial activity correlates with enhanced LPS binding and hydrophobicity but is not affected by partitioning. The data demonstrated that the enhanced anti-biofilm properties of the peptoids are associated with decreased hydrophobicity and increased penetration of the inner membrane, compared to that of their peptide counterpart, suggesting that the characteristic flexibility of peptoids or their lack of H-bonding donors in their backbone, would play a role in their ability to penetrate bacterial membranes.
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Affiliation(s)
- Paola Saporito
- Department of Science and Environment, Roskilde University, Roskilde, Denmark.,Section for Functional Genomics and Center for Bacterial Stress Response and Persistence, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Mojsoska Biljana
- Department of Science and Environment, Roskilde University, Roskilde, Denmark
| | - Anders Løbner Olesen
- Section for Functional Genomics and Center for Bacterial Stress Response and Persistence, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Håvard Jenssen
- Department of Science and Environment, Roskilde University, Roskilde, Denmark
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Ciumac D, Gong H, Hu X, Lu JR. Membrane targeting cationic antimicrobial peptides. J Colloid Interface Sci 2019; 537:163-185. [DOI: 10.1016/j.jcis.2018.10.103] [Citation(s) in RCA: 123] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 10/29/2018] [Accepted: 10/30/2018] [Indexed: 01/13/2023]
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Kolomaznik M, Liskayova G, Kanjakova N, Hubcik L, Uhrikova D, Calkovska A. The Perturbation of Pulmonary Surfactant by Bacterial Lipopolysaccharide and Its Reversal by Polymyxin B: Function and Structure. Int J Mol Sci 2018; 19:E1964. [PMID: 29976869 PMCID: PMC6073772 DOI: 10.3390/ijms19071964] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 06/30/2018] [Accepted: 07/04/2018] [Indexed: 01/04/2023] Open
Abstract
After inhalation, lipopolysaccharide (LPS) molecules interfere with a pulmonary surfactant, a unique mixture of phospholipids (PLs) and specific proteins that decreases surface tension at the air⁻liquid interphase. We evaluated the behaviour of a clinically used modified porcine pulmonary surfactant (PSUR) in the presence of LPS in a dynamic system mimicking the respiratory cycle. Polymyxin B (PxB), a cyclic amphipathic antibiotic, is able to bind to LPS and to PSUR membranes. We investigated the effect of PxB on the surface properties of the PSUR/LPS system. Particular attention was paid to mechanisms underlying the structural changes in surface-reducing features. The function and structure of the porcine surfactant mixed with LPS and PxB were tested with a pulsating bubble surfactometer, optical microscopy, and small- and wide-angle X-ray scattering (SAXS/WAXS). Only 1% LPS (w/w to surfactant PLs) prevented the PSUR from reaching the necessary low surface tension during area compression. LPS bound to the lipid bilayer of PSUR and disturbed its lamellar structure by swelling. The structural changes were attributed to the surface charge unbalance of the lipid bilayers due to LPS insertion. PxB acts as an inhibitor of structural disarrangement induced by LPS and restores original lamellar packing, as detected by polarised light microscopy and SAXS.
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Affiliation(s)
- Maros Kolomaznik
- Martin Biomedical Center and Department of Physiology, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, 036 01 Martin, Slovakia.
| | - Gilda Liskayova
- Department of Physical Chemistry of Drugs, Faculty of Pharmacy, Comenius University in Bratislava, 832 32 Bratislava, Slovakia.
| | - Nina Kanjakova
- Department of Physical Chemistry of Drugs, Faculty of Pharmacy, Comenius University in Bratislava, 832 32 Bratislava, Slovakia.
| | - Lukas Hubcik
- Department of Physical Chemistry of Drugs, Faculty of Pharmacy, Comenius University in Bratislava, 832 32 Bratislava, Slovakia.
| | - Daniela Uhrikova
- Department of Physical Chemistry of Drugs, Faculty of Pharmacy, Comenius University in Bratislava, 832 32 Bratislava, Slovakia.
| | - Andrea Calkovska
- Martin Biomedical Center and Department of Physiology, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, 036 01 Martin, Slovakia.
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25
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Prevention of ESKAPE pathogen biofilm formation by antimicrobial peptides WLBU2 and LL37. Int J Antimicrob Agents 2018; 52:667-672. [PMID: 29753132 DOI: 10.1016/j.ijantimicag.2018.04.019] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 04/03/2018] [Accepted: 04/29/2018] [Indexed: 12/22/2022]
Abstract
OBJECTIVES Bacterial biofilm-dependent infections (e.g. cystic fibrosis, surgical sites, and medical implants) are associated with enhanced drug-resistance and are thus difficult to eradicate. The goal of this study was to systematically compare three distinct classes of antimicrobial peptides (AMPs) that include the clinically used antibiotic colistin, the natural AMP LL37, the engineered cationic-AMP WLBU2, and four commonly used antibiotics with different bactericidal mechanisms (tobramycin, ciprofloxacin, ceftazidime, and vancomycin) for biofilm prevention properties. METHODS Using biofilm-prevention assays, we detected bacterial biomass post-attachment in subinhibitory concentrations (1/3 of the minimum inhibitory concentration [MIC]) for each AMP by the crystal violet method, to distinguish the commonly known bactericidal activity from potentially distinct mechanisms of biofilm prevention. Biofilm regulatory gene expression was assessed using RT-qPCR for correlation with biofilm growth inhibition. RESULTS Commonly used antibiotics at 1x MIC showed modest ESKAPE biofilm prevention while 1/3 MIC of AMPs demonstrated up to 90% biofilm prevention. WLBU2 was generally more effective in preventing bacterial attachment than colistin and LL37. Changes in bacterial biofilm regulatory gene expression were consistent with biofilm prevention. CONCLUSION The data warrant further exploration of AMPs with optimized structures to fill a knowledge gap on the potential application of AMPs for difficult-to-cure bacterial biofilm-related infections.
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A Rapid and Semi-Quantitative Gold Nanoparticles Based Strip Sensor for Polymyxin B Sulfate Residues. NANOMATERIALS 2018; 8:nano8030144. [PMID: 29510541 PMCID: PMC5869635 DOI: 10.3390/nano8030144] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 02/27/2018] [Accepted: 02/28/2018] [Indexed: 12/02/2022]
Abstract
Increasing attention is now being directed to the utilization of polymyxin B (PMB) as a last-line treatment for life-threatening infections caused by multidrug resistant Gram-negative bacteria. Unfortunately, polymyxins resistance is also increasingly reported, leaving a serious threat to human health. Therefore, the establishment of rapid detection methods for PMB residues is highly essential to ensure public health. In this study, two monoclonal antibodies (mAb; 2A2 and 3C6) were obtained using PMB-bovine serum albumin as the immunogen and PMB-ovalbumin as the coating antigen, which were prepared with N-(γ-maleimidobutyryloxy) succinimide ester and glutaraldehyde as cross-linking agents, respectively. Through an indirect competitive enzyme-linked immunosorbent assay, resultant two mAbs were compared and the results indicated that 3C6 showed higher sensitivity with a half maximum inhibition concentration of 13.13 ng/mL. Based on 3C6, a gold nanoparticles (AuNPs)-based immunochromatographic test (ICT) strip was then established, the mechanism of which is that free PMB competes with the fixed coating antigen to combine with mAb labeled by AuNPs. Using ICT strip to detect milk and animal feed samples revealed the visible detection limits were 25 ng/mL and 500 μg/kg, respectively and the cutoff limits were 100 ng/mL and 1000 μg/kg, respectively. The ICT strip provides results within 15 min, facilitating rapid and semi-quantitative analysis of PMB residues in milk and animal feed.
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27
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Han ML, Velkov T, Zhu Y, Roberts KD, Le Brun AP, Chow SH, Gutu AD, Moskowitz SM, Shen HH, Li J. Polymyxin-Induced Lipid A Deacylation in Pseudomonas aeruginosa Perturbs Polymyxin Penetration and Confers High-Level Resistance. ACS Chem Biol 2018; 13:121-130. [PMID: 29182311 DOI: 10.1021/acschembio.7b00836] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Polymyxins are last-line antibiotics against life-threatening multidrug-resistant Gram-negative bacteria. Unfortunately, polymyxin resistance is increasingly reported, leaving a total lack of therapies. Using lipidomics and transcriptomics, we discovered that polymyxin B induced lipid A deacylation via pagL in both polymyxin-resistant and -susceptible Pseudomonas aeruginosa. Our results demonstrated that the deacylation of lipid A is an "innate immunity" response to polymyxins and a key compensatory mechanism to the aminoarabinose modification to confer high-level polymyxin resistance in P. aeruginosa. Furthermore, cutting-edge neutron reflectometry studies revealed that an assembled outer membrane (OM) with the less hydrophobic penta-acylated lipid A decreased polymyxin B penetration, compared to the hexa-acylated form. Polymyxin analogues with enhanced hydrophobicity displayed superior penetration into the tail regions of the penta-acylated lipid A OM. Our findings reveal a previously undiscovered mechanism of polymyxin resistance, wherein polymyxin-induced lipid A remodeling affects the OM packing and hydrophobicity, perturbs polymyxin penetration, and thereby confers high-level resistance.
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Affiliation(s)
- Mei-Ling Han
- Monash
Institute of Pharmaceutical Sciences, Monash University, 381 Royal
Parade, Parkville, Victoria 3052, Australia
- Monash
Biomedicine Discovery Institute, Monash University, Clayton, Victoria 3800, Australia
| | - Tony Velkov
- Monash
Institute of Pharmaceutical Sciences, Monash University, 381 Royal
Parade, Parkville, Victoria 3052, Australia
- Department of Pharmacology & Therapeutics, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Yan Zhu
- Monash
Biomedicine Discovery Institute, Monash University, Clayton, Victoria 3800, Australia
| | - Kade D. Roberts
- Monash
Institute of Pharmaceutical Sciences, Monash University, 381 Royal
Parade, Parkville, Victoria 3052, Australia
| | - Anton P. Le Brun
- Australian
Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee
DC, New South Wales 2232, Australia
| | - Seong Hoong Chow
- Monash
Biomedicine Discovery Institute, Monash University, Clayton, Victoria 3800, Australia
| | - Alina D. Gutu
- Department
of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts United States
| | | | - Hsin-Hui Shen
- Monash
Biomedicine Discovery Institute, Monash University, Clayton, Victoria 3800, Australia
- Department
of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Jian Li
- Monash
Biomedicine Discovery Institute, Monash University, Clayton, Victoria 3800, Australia
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28
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Enhanced capture of bacteria and endotoxin by antimicrobial WLBU2 peptide tethered on polyethylene oxide spacers. Biointerphases 2017; 12:05G603. [DOI: 10.1116/1.4997049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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29
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Deslouches B, Di YP. Antimicrobial Peptides: A Potential Therapeutic Option for Surgical Site Infections. CLINICS IN SURGERY 2017; 2:1740. [PMID: 30135956 PMCID: PMC6101250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Surgical Site Infections (SSI) represents one of the most common hospital-associated infections worldwide, and many cases of SSI are due to multidrug-resistant bacteria with the propensity to attach to tissues and form biofilm on post-surgical sites. While systemic antibiotic treatment (prophylactically and therapeutically) is usually effective, SSI can be difficult to treat when associated with drug resistance. Antimicrobial Peptides (AMPs) are an untapped resource that could serve as an effective therapeutic option, as they display broad-spectrum antimicrobial activity regardless of antibiotic resistance. In the last decade, it has become increasingly clear that AMPs also display antibiofilm properties. We reviewed herein the potential of AMPs as promising therapeutics for SSI and the need for structural optimization to develop AMPs for clinical applications.
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Affiliation(s)
- Berthony Deslouches
- Department of Environmental and Occupational Health, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA, USA,Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Y Peter Di
- Department of Environmental and Occupational Health, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA, USA,Correspondence: Y Peter Di, Department of Environmental and Occupational Health, 100 Technology Drive, Bridgeside Point I, Room 331, Pittsburgh, PA 15206, USA, Tel: (412) 624-8718;
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30
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Cellulose nanomaterials emulsion coatings for controlling physiological activity, modifying surface morphology, and enhancing storability of postharvest bananas ( Musa acuminate ). Food Chem 2017; 232:359-368. [DOI: 10.1016/j.foodchem.2017.04.028] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/29/2017] [Accepted: 04/04/2017] [Indexed: 11/21/2022]
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31
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Li LH, Ju TC, Hsieh CY, Dong WC, Chen WT, Hua KF, Chen WJ. A synthetic cationic antimicrobial peptide inhibits inflammatory response and the NLRP3 inflammasome by neutralizing LPS and ATP. PLoS One 2017; 12:e0182057. [PMID: 28750089 PMCID: PMC5531531 DOI: 10.1371/journal.pone.0182057] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 07/11/2017] [Indexed: 11/18/2022] Open
Abstract
Antimicrobial peptides (AMPs) are one of the most important defense mechanisms against bacterial infections in insects, plants, non-mammalian vertebrates, and mammals. In the present study, a class of synthetic AMPs was evaluated for anti-inflammatory activity. One cationic AMP, GW-A2, demonstrated the ability to inhibit the expression levels of nitric oxide (NO), inducible NO synthase (iNOS), cyclooxygenase-2 (COX-2), tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) in lipopolysaccharide (LPS)-activated macrophages. GW-A2 reduced LPS-induced increases in the phosphorylation of mitogen-activated protein kinase and protein kinase C-α/δ and the activation of NF-κB. GW-A2 also inhibited NLRP3 inflammasome activation induced by LPS and ATP. Furthermore, in the mice injected with LPS, GW-A2 reduced (1) the concentration of IL-1β, IL-6 and TNF-α in the serum; (2) the concentration of TNF-α in the peritoneal lavage; (3) the expression levels of iNOS, COX-2 and NLRP3 in the liver and lung; (4) the infiltration of polymorphonuclear neutrophils in the liver and lung. The underlying mechanisms for the anti-inflammatory activity of GW-A2 were found to be partially due to LPS and ATP neutralization. These results provide insights into how GW-A2 inhibits inflammation and the NLRP3 inflammasome and provide a foundation for the design of rational therapeutics for inflammation-related diseases.
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Affiliation(s)
- Lan-Hui Li
- Department of Laboratory Medicine, Lisen, Chinese Medicine and Kunming Branch, Taipei City Hospital, Taipei, Taiwan
| | - Tz-Chuen Ju
- Department of Nursing, St. Mary's Junior College of Medicine, Nursing and Management, Ilan, Taiwan
| | - Chih-Yu Hsieh
- Department of Biotechnology and Animal Science, National Ilan University, Ilan, Taiwan
| | - Wei-Chih Dong
- Department of Biotechnology and Animal Science, National Ilan University, Ilan, Taiwan
| | - Wan-Tze Chen
- Department of Biotechnology and Animal Science, National Ilan University, Ilan, Taiwan
| | - Kuo-Feng Hua
- Department of Biotechnology and Animal Science, National Ilan University, Ilan, Taiwan
- Department of Pathology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
- * E-mail: (KFH); (WJC)
| | - Wei-Jung Chen
- Department of Biotechnology and Animal Science, National Ilan University, Ilan, Taiwan
- * E-mail: (KFH); (WJC)
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Hanna SL, Huang JL, Swinton AJ, Caputo GA, Vaden TD. Synergistic effects of polymyxin and ionic liquids on lipid vesicle membrane stability and aggregation. Biophys Chem 2017; 227:1-7. [PMID: 28526567 DOI: 10.1016/j.bpc.2017.05.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 05/04/2017] [Accepted: 05/06/2017] [Indexed: 12/12/2022]
Abstract
Ionic liquids (ILs) have been investigated for potential antibacterial and antibiotic applications due to their ability to destabilize and permeabilize the lipid bilayers in cell membranes. Bacterial assays have shown that combining ILs with antibiotics can provide a synergistic enhancement of their antibacterial activities. We have characterized the mechanism by which the conventional ILs 1-butyl-3-methylimidazolium chloride (BMICl) and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4) enhance the lipid membrane permeabilization of the well-known antibiotic polymyxin B (PMB). We studied the sizes and membrane permeabilities of multilamellar and unilamellar lipid bilayer vesicles in the presence of ILs alone in aqueous solution, PMB alone, and ILs combined together with PMB. Light scattering-based experiments show that vesicle sizes dramatically increase when ILs are combined with PMB, which suggests that the materials combine to synergistically enhance lipid membrane disruption leading to vesicle aggregation. Lipid bilayer leakage experiments using tris (2,2'-bipyridyl) ruthenium (II) (Ru(bpy)32+) trapped in lipid vesicles, in which the trapped Ru(bpy)32+ fluorescence lifetime increases when it leaks out of the vesicle, show that combining BMIBF4 and PMB together permeabilize the membrane significantly more than with PMB or the IL alone. This demonstrates that ILs can assist in antibiotic permeabilization of lipid bilayers which could explain the increased antibiotic activities in the presence of ILs in solution.
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Affiliation(s)
- Sylvia L Hanna
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States
| | - Jenny L Huang
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States
| | - Alana J Swinton
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States
| | - Gregory A Caputo
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States; Department of Biomedical and Translational Sciences, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States
| | - Timothy D Vaden
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States.
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33
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Identifying the selectivity of antimicrobial peptides to cell membranes by sum frequency generation spectroscopy. Biointerphases 2017; 12:02D406. [PMID: 28476090 DOI: 10.1116/1.4982710] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Cationic amphiphilic peptides have been engineered to target both Gram-positive and Gram-negative bacteria while avoiding damage to other cell types. However, the exact mechanism of how these peptides target, bind, and disrupt bacterial cell membranes is not understood. One specific peptide that has been engineered to selectively capture bacteria is WLBU2 (sequence: RRWVRRVRRWVRRVVRVVRRWVRR). It has been suggested that WLBU2 activity stems from the fact that when interacting with bacterial cell membranes the peptide assumes an α-helical structure and inserts itself into the membrane. Alternatively, in the presence of mammalian cell membranes, the peptide assumes an inert β-sheet structure. To test this hypothesis, the authors applied sum frequency generation (SFG) spectroscopy and surface tensiometry to identify the structure of WLBU2 as it interacts with model lipid monolayers that mimic mammalian and bacterial cell membranes. Model mammalian cell membranes were built upon zwitterionic 1,2-dipalmitoyl-sn-glycero-3-phosphocholine lipids while bacterial cell membranes were constructed with negatively charged 1,2-dimyristoyl-sn-glycero-3-phospho-(1'-rac-glycerol) lipids. Observed changes in surface pressure at the peptide-lipid-air interface demonstrate that the peptide has a clear binding preference toward negatively charged bacteria-like lipids. The structure of both the lipids and peptides were characterized by SFG spectra collected at the monolayer interface. Changes in monolayer structure as the peptide binds were observed by tracking the intensities of SFG vibrational modes related to the acyl chains within the lipids. Peptide structures when bound to both types of lipids were determined by SFG spectra collected within the amide I vibrational band. The SFG spectra of WLBU2 interacting with the model mammalian lipid monolayer contain two peaks near 1642 and 1678 cm-1 indicative of an inactive β-sheet structure. SFG spectra collected from the peptide bound to a bacteria-like lipid monolayer contains just a single peak near 1651 cm-1 which corresponds to an active α-helix structure. Combined, the tensiometry and SFG results demonstrate that WLBU2 both possesses a higher binding affinity toward and is in an active α-helix structure when bound to bacterial cell membranes.
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34
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Dou X, Zhu X, Wang J, Dong N, Shan A. Novel Design of Heptad Amphiphiles To Enhance Cell Selectivity, Salt Resistance, Antibiofilm Properties and Their Membrane-Disruptive Mechanism. J Med Chem 2017; 60:2257-2270. [PMID: 28230992 DOI: 10.1021/acs.jmedchem.6b01457] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Coiled-coil, a basic folding pattern of native proteins, was previously demonstrated to be associated with the specific spatial recognition, association, and dissociation of proteins and can be used to perfect engineering peptide model. Thus, in this study, a series of amphiphiles composed of heptads repeats with coiled-coil structures was constructed, and the designed peptides exhibited a broad spectrum of antimicrobial activities. Circular dichroism and biological assays showed that the heptad repeats and length of the linker between the heptads largely influenced the amphiphile's helical propensity and cell selectivity. The engineered amphiphiles were also found to efficiently reduce sessile P. aeruginosa biofilm biomass, neutralize endotoxins, inhibit the inflammatory response, and remain active under physiological salt concentrations. In summary, these findings are helpful for short AMP design with a highly therapeutic index to treat bacteria-induced infection.
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Affiliation(s)
- Xiujing Dou
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China
| | - Xin Zhu
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China.,College of Animal Science & Veterinary Medicine, Shenyang Agricultural University , Shenyang 110866, P. R. China
| | - Jiajun Wang
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China
| | - Na Dong
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China
| | - Anshan Shan
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China
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35
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Xue J, Zhang J, Xu B, Xie J, Wu W, Lu Y. Endotoxins: The Critical Risk Factor in Reclaimed Water via Inhalation Exposure. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:11957-11964. [PMID: 27709904 DOI: 10.1021/acs.est.6b02395] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The use of reclaimed water for nonpotable uses requires consideration of potential adverse health effects. Considering that inhalation can be a significant route of transmission of microorganisms and inflammatory agents, this study used a mouse model to test the possible adverse effects of reclaimed water use during car washing where aerosols are generated. Intensive innate immune responses were found in the lungs after acute exposure, and the lavage polymorphonuclear cell proportion was the most sensitive end point. Four types of evidence are presented to demonstrate that the main risk factor that initiates innate inflammation is the free endotoxin. (1) Small molecules (<10 kDa) cannot induce inflammation. (2) The endotoxin levels of 11 water samples from five different plants showed positive correlations with inflammatory responses. (3) Actual water samples showed similar activities with free endotoxins other than bacterially bound endotoxins. (4) Specific removal of endotoxins with polymyxin B affinity chromatography further confirmed the role of free endotoxins. It is noteworthy that 62.9% of the investigated tertiary-treated water had endotoxin levels higher than the allowable acute threshold (120 endotoxin units/mL) under the hypothesized car wash condition, which strongly suggests the need to carefully consider the water treatment steps required to produce safe water for various reclaimed water end uses.
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Affiliation(s)
- Jinling Xue
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing 100084, People's Republic of China
| | - Jinshan Zhang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing 100084, People's Republic of China
| | - Bi Xu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing 100084, People's Republic of China
| | - Jiani Xie
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing 100084, People's Republic of China
| | - Wenzhao Wu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing 100084, People's Republic of China
| | - Yun Lu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing 100084, People's Republic of China
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36
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Melvin JA, Montelaro RC, Bomberger JM. Clinical potential of engineered cationic antimicrobial peptides against drug resistant biofilms. Expert Rev Anti Infect Ther 2016; 14:989-991. [PMID: 27626708 DOI: 10.1080/14787210.2016.1236687] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Jeffrey A Melvin
- a Department of Microbiology and Molecular Genetics , University of Pittsburgh , Pittsburgh , PA , USA
| | - Ronald C Montelaro
- a Department of Microbiology and Molecular Genetics , University of Pittsburgh , Pittsburgh , PA , USA
| | - Jennifer M Bomberger
- a Department of Microbiology and Molecular Genetics , University of Pittsburgh , Pittsburgh , PA , USA
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37
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Simultaneous Antibiofilm and Antiviral Activities of an Engineered Antimicrobial Peptide during Virus-Bacterium Coinfection. mSphere 2016; 1:mSphere00083-16. [PMID: 27303744 PMCID: PMC4888888 DOI: 10.1128/msphere.00083-16] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 04/15/2016] [Indexed: 01/13/2023] Open
Abstract
Antimicrobial-resistant infections are an urgent public health threat, making development of novel antimicrobials able to effectively treat these infections extremely important. Chronic and polymicrobial infections further complicate antimicrobial therapy, often through the development of microbial biofilms. Here, we describe the ability of an engineered antimicrobial peptide to disrupt biofilms formed by the ESKAPE (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter species) pathogen Pseudomonas aeruginosa during coinfection with respiratory syncytial virus. We also observed antiviral activity, indicating the ability of engineered antimicrobial peptides to act as cross-kingdom single-molecule combination therapies. Antimicrobial-resistant infections are an urgent public health threat, and development of novel antimicrobial therapies has been painstakingly slow. Polymicrobial infections are increasingly recognized as a significant source of severe disease and also contribute to reduced susceptibility to antimicrobials. Chronic infections also are characterized by their ability to resist clearance, which is commonly linked to the development of biofilms that are notorious for antimicrobial resistance. The use of engineered cationic antimicrobial peptides (eCAPs) is attractive due to the slow development of resistance to these fast-acting antimicrobials and their ability to kill multidrug-resistant clinical isolates, key elements for the success of novel antimicrobial agents. Here, we tested the ability of an eCAP, WLBU2, to disrupt recalcitrant Pseudomonas aeruginosa biofilms. WLBU2 was capable of significantly reducing biomass and viability of P. aeruginosa biofilms formed on airway epithelium and maintained activity during viral coinfection, a condition that confers extraordinary levels of antibiotic resistance. Biofilm disruption was achieved in short treatment times by permeabilization of bacterial membranes. Additionally, we observed simultaneous reduction of infectivity of the viral pathogen respiratory syncytial virus (RSV). WLBU2 is notable for its ability to maintain activity across a broad range of physiological conditions and showed negligible toxicity toward the airway epithelium, expanding its potential applications as an antimicrobial therapeutic. IMPORTANCE Antimicrobial-resistant infections are an urgent public health threat, making development of novel antimicrobials able to effectively treat these infections extremely important. Chronic and polymicrobial infections further complicate antimicrobial therapy, often through the development of microbial biofilms. Here, we describe the ability of an engineered antimicrobial peptide to disrupt biofilms formed by the ESKAPE (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter species) pathogen Pseudomonas aeruginosa during coinfection with respiratory syncytial virus. We also observed antiviral activity, indicating the ability of engineered antimicrobial peptides to act as cross-kingdom single-molecule combination therapies.
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Roberts JL, Cattoz B, Schweins R, Beck K, Thomas DW, Griffiths PC, Ferguson EL. In Vitro Evaluation of the Interaction of Dextrin–Colistin Conjugates with Bacterial Lipopolysaccharide. J Med Chem 2016; 59:647-54. [DOI: 10.1021/acs.jmedchem.5b01521] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jessica L. Roberts
- Advanced
Therapies Group, School of Dentistry, Cardiff University, Heath Park, Cardiff CF14 4XY, U.K
| | - Beatrice Cattoz
- Department
of Pharmaceutical, Chemical and Environmental Sciences, Faculty of
Engineering and Science, University of Greenwich, Medway Campus, Central Avenue, Chatham Maritime ME4 4TB, U.K
| | - Ralf Schweins
- Institut Laue-Langevin, DS/LSS group, 6, rue Jules Horowitz, 38042 Cedex 9 Grenoble, France
| | - Konrad Beck
- Advanced
Therapies Group, School of Dentistry, Cardiff University, Heath Park, Cardiff CF14 4XY, U.K
| | - David W. Thomas
- Advanced
Therapies Group, School of Dentistry, Cardiff University, Heath Park, Cardiff CF14 4XY, U.K
| | - Peter C. Griffiths
- Department
of Pharmaceutical, Chemical and Environmental Sciences, Faculty of
Engineering and Science, University of Greenwich, Medway Campus, Central Avenue, Chatham Maritime ME4 4TB, U.K
| | - Elaine L. Ferguson
- Advanced
Therapies Group, School of Dentistry, Cardiff University, Heath Park, Cardiff CF14 4XY, U.K
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39
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Chen H, Liu C, Chen D, Madrid K, Peng S, Dong X, Zhang M, Gu Y. Bacteria-Targeting Conjugates Based on Antimicrobial Peptide for Bacteria Diagnosis and Therapy. Mol Pharm 2015; 12:2505-16. [DOI: 10.1021/acs.molpharmaceut.5b00053] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Haiyan Chen
- Department of Biomedical Engineering, School of Engineering, State Key Laboratory of Natural Medicines, and ‡School of Pharmacy, China Pharmaceutical University, 24 Tongjia Lane, Gulou
District, Nanjing 210009, China
| | - Cuicui Liu
- Department of Biomedical Engineering, School of Engineering, State Key Laboratory of Natural Medicines, and ‡School of Pharmacy, China Pharmaceutical University, 24 Tongjia Lane, Gulou
District, Nanjing 210009, China
| | - Dan Chen
- Department of Biomedical Engineering, School of Engineering, State Key Laboratory of Natural Medicines, and ‡School of Pharmacy, China Pharmaceutical University, 24 Tongjia Lane, Gulou
District, Nanjing 210009, China
| | - Kyle Madrid
- Department of Chemistry, University of California, 900 University Avenue, Riverside, California 92521, United States
| | - Shuwen Peng
- Department of Biomedical Engineering, School of Engineering, State Key Laboratory of Natural Medicines, and ‡School of Pharmacy, China Pharmaceutical University, 24 Tongjia Lane, Gulou
District, Nanjing 210009, China
| | | | - Min Zhang
- Department of Biomedical Engineering, School of Engineering, State Key Laboratory of Natural Medicines, and ‡School of Pharmacy, China Pharmaceutical University, 24 Tongjia Lane, Gulou
District, Nanjing 210009, China
| | - Yueqing Gu
- Department of Biomedical Engineering, School of Engineering, State Key Laboratory of Natural Medicines, and ‡School of Pharmacy, China Pharmaceutical University, 24 Tongjia Lane, Gulou
District, Nanjing 210009, China
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40
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Coblyn M, Truszkowska A, Mohammadi M, Heintz K, McGuire J, Sharp K, Jovanovic G. Effect of PEO coating on bubble behavior within a polycarbonate microchannel array: A model for hemodialysis. J Biomed Mater Res B Appl Biomater 2015; 104:941-8. [PMID: 25976358 DOI: 10.1002/jbm.b.33440] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 03/01/2015] [Accepted: 04/07/2015] [Indexed: 11/08/2022]
Abstract
Obstruction of fluid flow by stationary bubbles in a microchannel hemodialyzer decreases filtration performance and increases damage to blood cells through flow maldistribution. A polyethylene oxide (PEO)-polybutadiene (PB)-polyethylene oxide surface modification, previously shown to reduce protein fouling and water/air contact angle in polycarbonate microchannel hemodialyzers, can improve microchannel wettability and may reduce bubble stagnation by lessening the resistive forces that compete with fluid flow. In this study, the effect of the PEO-PB-PEO coating on bubble retention in a microchannel array was investigated. Polycarbonate microchannel surfaces were coated with PEO-PB-PEO triblock polymer via radiolytic grafting. Channel obstruction was measured for coated and uncoated microchannels after injecting a short stream of air bubbles into the device under average nominal water velocities of 0.9 to 7.2 cm/s in the channels. The presence of the PEO coating reduced obstruction of microchannels by stationary bubbles within the range of 1.8 to 3.6 cm/s, average nominal velocity. Numerical simulations based on the lattice Boltzmann method indicate that beneficial effects may be due to the maintenance of a lubricating, thin liquid film around the bubble. The determined effective range of the PEO coating for bubble management serves as an important design constraint. These findings serve to validate the multiutility of the PEO-PB-PEO coating (bubble lubrication, biocompatibility, and therapeutic loading). © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 941-948, 2016.
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Affiliation(s)
- Matthew Coblyn
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon, 97331
| | - Agnieszka Truszkowska
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon, 97331
| | - Mahshid Mohammadi
- School of Mechanical Industrial and Manufacturing Engineering, Oregon State University, Corvallis, Oregon, 97331
| | - Keely Heintz
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon, 97331
| | - Joseph McGuire
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon, 97331
| | - Kendra Sharp
- School of Mechanical Industrial and Manufacturing Engineering, Oregon State University, Corvallis, Oregon, 97331
| | - Goran Jovanovic
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon, 97331
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