1
|
Hansson A, Karlsen EA, Stensen W, Svendsen JSM, Berglin M, Lundgren A. Preventing E. coli Biofilm Formation with Antimicrobial Peptide-Functionalized Surface Coatings: Recognizing the Dependence on the Bacterial Binding Mode Using Live-Cell Microscopy. ACS APPLIED MATERIALS & INTERFACES 2024; 16:6799-6812. [PMID: 38294883 PMCID: PMC10875647 DOI: 10.1021/acsami.3c16004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 01/16/2024] [Accepted: 01/18/2024] [Indexed: 02/02/2024]
Abstract
Antimicrobial peptides (AMPs) can kill bacteria by destabilizing their membranes, yet translating these molecules' properties into a covalently attached antibacterial coating is challenging. Rational design efforts are obstructed by the fact that standard microbiology methods are ill-designed for the evaluation of coatings, disclosing few details about why grafted AMPs function or do not function. It is particularly difficult to distinguish the influence of the AMP's molecular structure from other factors controlling the total exposure, including which type of bonds are formed between bacteria and the coating and how persistent these contacts are. Here, we combine label-free live-cell microscopy, microfluidics, and automated image analysis to study the response of surface-bound Escherichia coli challenged by the same small AMP either in solution or grafted to the surface through click chemistry. Initially after binding, the grafted AMPs inhibited bacterial growth more efficiently than did AMPs in solution. Yet, after 1 h, E. coli on the coated surfaces increased their expression of type-1 fimbriae, leading to a change in their binding mode, which diminished the coating's impact. The wealth of information obtained from continuously monitoring the growth, shape, and movements of single bacterial cells allowed us to elucidate and quantify the different factors determining the antibacterial efficacy of the grafted AMPs. We expect this approach to aid the design of elaborate antibacterial material coatings working by specific and selective actions, not limited to contact-killing. This technology is needed to support health care and food production in the postantibiotic era.
Collapse
Affiliation(s)
- Adam Hansson
- Department
of Chemistry and Molecular Biology, University
of Gothenburg, Gothenburg 40530, Sweden
- Department
of Chemistry and Materials, RISE Research
Institutes of Sweden, Borås 50115, Sweden
| | - Eskil André Karlsen
- Amicoat
A/S, Sykehusvegen 23, Tromsø 9019, Norway
- Department
of Chemistry, UiT The Arctic University
of Norway, Tromsø 9037, Norway
| | - Wenche Stensen
- Department
of Chemistry, UiT The Arctic University
of Norway, Tromsø 9037, Norway
| | - John S. M. Svendsen
- Amicoat
A/S, Sykehusvegen 23, Tromsø 9019, Norway
- Department
of Chemistry, UiT The Arctic University
of Norway, Tromsø 9037, Norway
| | - Mattias Berglin
- Department
of Chemistry and Molecular Biology, University
of Gothenburg, Gothenburg 40530, Sweden
- Department
of Chemistry and Materials, RISE Research
Institutes of Sweden, Borås 50115, Sweden
| | - Anders Lundgren
- Department
of Chemistry and Molecular Biology, University
of Gothenburg, Gothenburg 40530, Sweden
- Centre
for Antibiotic Resistance Research (CARe), University of Gothenburg, Gothenburg 41346, Sweden
| |
Collapse
|
2
|
Wei Z, Rolle MW, Camesano TA. LL37 and collagen-binding domain-mediated LL37 binding with type I collagen: Quantification via QCM-D. Colloids Surf B Biointerfaces 2022; 220:112852. [PMID: 36179608 DOI: 10.1016/j.colsurfb.2022.112852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 08/28/2022] [Accepted: 09/13/2022] [Indexed: 12/29/2022]
Abstract
Antimicrobial peptide (AMP)-loaded biomaterials may represent a viable alternative for stimulating wound healing while protecting against infections. Previously, to develop an efficient delivery system for the cathelicidin antimicrobial peptide, LL37, our lab modified LL37 with a collagen-binding domain derived from collagenase (cCBD) as an anchoring unit to collagen-based wound dressings. However, a direct quantification of unmodified LL37 and cCBD-LL37 binding with collagen has not been performed. In this study, we used quartz crystal microbalance with dissipation monitoring (QCM-D), immunohistochemistry (IHC), and atomic force microscopy (AFM) to establish and characterize an adsorbed layer of type I collagen on the QCM-D sensor and quantify peptide-collagen binding. A collagen deposition protocol was successfully established by measuring concentration-dependent deposition of collagen in QCM-D, and collagen self-assembly was observed by IHC and AFM. Hydrophobicity is known to affect the behavior of collagen adsorption. Therefore, we compared the deposition of collagen on hydrophilic SiO2-coated sensors vs. hydrophobic polystyrene (PS)-coated sensors via QCM-D, and found that the hydrophobic surface yielded more collagen adsorption, which suggested that hydrophobic surfaces are preferable for collagen layer establishment. There was no significant difference between LL37 and cCBD-LL37 binding with collagen, but the cCBD-LL37 showed better retention on the collagen after washing with PBS, indicating that there is an advantage to using cCBD as an anchoring unit to collagen. Collectively, these results provide important information on cCBD-mediated AMP-binding mechanisms and establish an effective method for quantifying peptide-collagen binding.
Collapse
Affiliation(s)
- Ziqi Wei
- Department of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States
| | - Marsha W Rolle
- Department of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States
| | - Terri A Camesano
- Department of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States.
| |
Collapse
|
3
|
Li B, Song J, Mao T, Zeng L, Ye Z, Hu B. An essential role of disulfide bonds for the hierarchical self-assembly and underwater affinity of CP20-derived peptides. Front Bioeng Biotechnol 2022; 10:998194. [DOI: 10.3389/fbioe.2022.998194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 09/30/2022] [Indexed: 11/13/2022] Open
Abstract
Barnacles are typical fouling organisms strongly adhere to immersed solid substrates by secreting proteinaceous adhesives called cement proteins (CPs). The self-assembly of the CPs forms a permanently bonded layer that binds barnacles to foreign surfaces. However, it is difficult to determine their natural structure and describe their self-assembly properties due to the abundance of cysteines in whole-length CP20. A putative functional motif of Balanus albicostatus CP20 (BalCP20) was identified to present distinctive self-assembly and wet-binding characteristics. Atomic-force microscopy (AFM) and transmission electron microscope (TEM) investigations showed that wildtype BalCP20-P3 formed grain-like spindles, which assembled into fractal-like structures like ears of wheat. SDS-PAGE, AFM, and LSCM showed that DTT treatment opened up disulfide bonds between cysteines and disrupted fractal-like structures. Additionally, these morphologies were abolished when one of the BalCP20-P3 four cysteines was mutated by alanine. Circular dichroism (CD) results suggested that the morphological diversity among BalCP20-P3 and its mutations was related to the proportion of α-helices. Finally, quartz crystal microbalance with dissipation (QCM-D) detected that BalCP20-P3 and its mutations with diverse self-assemblies occupied different affinities. The above results demonstrated that cysteines and disulfide bonds played a crucial role in the self-assembly and wet binding of BalCP20-P3. The work provides new ideas for the underwater bonding of BalCP20 and developing new bionic underwater adhesives.
Collapse
|
4
|
Enhancement of Osteogenic Induction by LL37 Modified with a Collagen-Binding Domain In Vitro and In Vivo. Int J Pept Res Ther 2021. [DOI: 10.1007/s10989-021-10216-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
5
|
Wong SHD, Xu X, Chen X, Xin Y, Xu L, Lai CHN, Oh J, Wong WKR, Wang X, Han S, You W, Shuai X, Wong N, Tan Y, Duan L, Bian L. Manipulation of the Nanoscale Presentation of Integrin Ligand Produces Cancer Cells with Enhanced Stemness and Robust Tumorigenicity. NANO LETTERS 2021; 21:3225-3236. [PMID: 33764789 DOI: 10.1021/acs.nanolett.1c00501] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Developing strategies for efficient expansion of cancer stem-like cells (CSCs) in vitro will help investigate the mechanism underlying tumorigenesis and cancer recurrence. Herein, we report a dynamic culture substrate tethered with integrin ligand-bearing magnetic nanoparticles via a flexible polymeric linker to enable magnetic manipulation of the nanoscale ligand tether mobility. The cancer cells cultured on the substrate with high ligand tether mobility develop into large semispherical colonies with CSCs features, which can be abrogated by magnetically restricting the ligand tether mobility. Mechanistically, the substrate with high ligand tether mobility suppresses integrin-mediated mechanotransduction and histone-related methylation, thereby enhancing cancer cell stemness. The culture-derived high-stemness cells can generate tumors both locally and at the distant lung and uterus much more efficiently than the low-stemness cells. We believe that this magnetic nanoplatform provides a promising strategy for investigating the dynamic interaction between CSCs and the microenvironment and establishing a cost-effective tumor spheroid model.
Collapse
Affiliation(s)
- Siu Hong Dexter Wong
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, China
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China
| | - Xiao Xu
- Department of Orthopedics, Shenzhen Intelligent Orthopaedics and Biomedical Innovation Platform, Guangdong Artificial Intelligence Biomedical Innovation Platform, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, 518035, China
| | - Xi Chen
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, China
- Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen 518000, China
| | - Ying Xin
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, China
- Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen 518000, China
| | - Limei Xu
- Department of Orthopedics, Shenzhen Intelligent Orthopaedics and Biomedical Innovation Platform, Guangdong Artificial Intelligence Biomedical Innovation Platform, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, 518035, China
| | - Chun Him Nathanael Lai
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China
| | - Jiwon Oh
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China
| | - Wai Ki Ricky Wong
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China
| | - Xuemei Wang
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China
| | - Shisong Han
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China
- PCFM Lab of Ministry of Education, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China
- Laboratory of Interventional Radiology, Department of Minimally Invasive Interventional Radiology, and Department of Radiology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Wenxing You
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China
- Department of Surgery at Sir Y. K. Pao Centre for Cancer, The Chinese University of Hong Kong, Hong Kong, 999077, China
| | - Xintao Shuai
- PCFM Lab of Ministry of Education, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China
- Laboratory of Interventional Radiology, Department of Minimally Invasive Interventional Radiology, and Department of Radiology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Nathalie Wong
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China
- Department of Surgery at Sir Y. K. Pao Centre for Cancer, The Chinese University of Hong Kong, Hong Kong, 999077, China
| | - Youhua Tan
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, China
- Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen 518000, China
| | - Li Duan
- Department of Orthopedics, Shenzhen Intelligent Orthopaedics and Biomedical Innovation Platform, Guangdong Artificial Intelligence Biomedical Innovation Platform, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, 518035, China
| | - Liming Bian
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, 518172, China
- China Orthopedic Regenerative Medicine Group (CORMed) Hangzhou, Zhejiang, 310058, China
| |
Collapse
|
6
|
Role of lipopolysaccharides and lipoteichoic acids on C-Chrysophsin-1 interactions with model Gram-positive and Gram-negative bacterial membranes. Biointerphases 2020; 15:031007. [PMID: 32456440 DOI: 10.1116/1.5130774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Antimicrobial peptides (AMPs) are attractive as biomaterial coatings because they have broad spectrum activity against different microbes, with a low likelihood of incurring antimicrobial resistance. Direct action against the bacterial membrane is the most common mechanism of action (MOA) of AMPs, with specific MOAs dependent on membrane composition, peptide concentration, and environmental factors that include temperature. Chrysophsin-1 (CHY1) is a broad spectrum salt-tolerant AMP that is derived from a marine fish. A cysteine modification was made to the peptide to facilitate attachment to a surface, such as a biomedical device. The authors used quartz crystal microbalance with dissipation monitoring to study how temperature (23 and 37 °C) and lipid composition influence the MOA of cysteine-modified peptide (C-CHY1) with model membranes comprised of supported lipid bilayers (SLBs). These two temperatures were used so that the authors could better understand the differences in behavior between typical lab temperatures and physiologic conditions. The authors created model membranes that mimicked properties of Gram-negative and Gram-positive bacteria in order to understand how the mechanisms might differ for different types of bacterial systems. SLB models of Gram-positive bacterial membranes were formed using combinations of phosphatidylcholine, phosphatidylglycerol (PG), and S. aureus-derived lipoteichoic acid (LTA). SLB models of Gram-negative bacterial membranes were formed using combinations of phosphatidylethanolamine (PE), PG, and E. coli-derived lipopolysaccharides (LPS). The molecules that distinguish Gram-positive and Gram-negative membranes (LTA and LPS) have the potential to alter the MOA of C-CHY1 with the SLBs. The authors' results showed that the MOA for the Gram-positive SLBs was not sensitive to temperature, but the LTA addition did have an effect. Specifically, similar trends in frequency and dissipation changes across all overtones were observed, and the same mechanistic trends were observed in the polar plots at 23 and 37 °C. However, when LTA was added, polar plots showed an association between C-CHY1 and LTA, leading to SLB saturation. This was demonstrated by significant changes in dissipation, while the frequency (mass) was not increasing after the saturation point. For the Gram-negative SLBs, the composition did not have a significant effect on MOA, but the authors saw more differences between the two temperatures studied. The authors believe this is due to the fact that the gel-liquid crystal transition temperature of PE is 25 °C, which means that the bilayer is more rigid at 23 °C, compared to temperatures above the transition point. At 23 °C, a significant energetic shift would be required to allow for additional AMP insertion. This could be seen in the polar plots, where there was a steep slope but there was very little mass addition. At 37 °C, the membrane is more fluid and there is less of an energetic requirement for insertion. Therefore, the authors observed greater mass addition and fewer changes in dissipation. A better understanding of C-CHY1 MOA using different SLB models will allow for the more rational design of future therapeutic solutions that make use of antimicrobial peptides, including those involving biomaterial coatings.
Collapse
|
7
|
Lozeau LD, Grosha J, Smith IM, Stewart EJ, Camesano TA, Rolle MW. Alginate Affects Bioactivity of Chimeric Collagen-Binding LL37 Antimicrobial Peptides Adsorbed to Collagen-Alginate Wound Dressings. ACS Biomater Sci Eng 2020; 6:3398-3410. [PMID: 33463166 DOI: 10.1021/acsbiomaterials.0c00227] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Chronic infected wounds cause more than 23,000 deaths annually. Antibiotics and antiseptics are conventionally used to treat infected wounds; however, they can be toxic to mammalian cells, and their use can contribute to antimicrobial resistance. Antimicrobial peptides (AMPs) have been utilized to address the limitations of antiseptics and antibiotics. In previous work, we modified the human AMP LL37 with collagen-binding domains from collagenase (cCBD) or fibronectin (fCBD) to facilitate peptide tethering and delivery from collagen-based wound dressings. We found that cCBD-LL37 and fCBD-LL37 were retained and active when bound to 100% collagen scaffolds. Collagen wound dressings are commonly made as composites with other materials, such as alginate. The goal of this study was to investigate how the presence of alginate affects the tethering, release, and antimicrobial activity of LL37 and CBD-LL37 peptides adsorbed to commercially available collagen-alginate wound dressings (FIBRACOL Plus-a 90% collagen and 10% alginate wound dressing). We found that over 85% of the LL37, cCBD-LL37, and fCBD-LL37 was retained on FIBRACOL Plus over a 14-day release study (90.3, 85.8, and 98.6%, respectively). Additionally, FIBRACOL Plus samples loaded with peptides were bactericidal toward Pseudomonas aeruginosa, even after 14 days in release buffer but demonstrated no antimicrobial activity against Escherichia coli, Staphylococcus aureus, and Staphylococcus epidermidis. The presence of alginate in solution induced conformational changes in the cCBD-LL37 and LL37 peptides, resulting in increased peptide helicity, and reduced antimicrobial activity against P. aeruginosa. Peptide-loaded FIBRACOL Plus scaffolds were not cytotoxic to human dermal fibroblasts. This study demonstrates that CBD-mediated LL37 tethering is a viable strategy to reduce LL37 toxicity, and how substrate composition plays a crucial role in modulating the antimicrobial activity of tethered AMPs.
Collapse
Affiliation(s)
- Lindsay D Lozeau
- Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States
| | - Jonian Grosha
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States
| | - Ian M Smith
- Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States
| | - Elizabeth J Stewart
- Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States.,Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States
| | - Terri A Camesano
- Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States.,Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States
| | - Marsha W Rolle
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States
| |
Collapse
|
8
|
Yasir M, Dutta D, Hossain KR, Chen R, Ho KKK, Kuppusamy R, Clarke RJ, Kumar N, Willcox MDP. Mechanism of Action of Surface Immobilized Antimicrobial Peptides Against Pseudomonas aeruginosa. Front Microbiol 2020; 10:3053. [PMID: 32038530 PMCID: PMC6987417 DOI: 10.3389/fmicb.2019.03053] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 12/18/2019] [Indexed: 12/26/2022] Open
Abstract
Bacterial colonization and biofilm development on medical devices can lead to infection. Antimicrobial peptide-coated surfaces may prevent such infections. Melimine and Mel4 are chimeric cationic peptides showing broad-spectrum antimicrobial activity once attached to biomaterials and are highly biocompatible in animal models and have been tested in Phase I and II/III human clinical trials. These peptides were covalently attached to glass using an azidobenzoic acid linker. Peptide attachment was confirmed using X-ray photoelectron spectroscopy and amino acid analysis. Mel4 when bound to glass was able to adopt a more ordered structure in the presence of bacterial membrane mimetic lipids. The ability of surface bound peptides to neutralize endotoxin was measured along with their interactions with the bacterial cytoplasmic membrane which were analyzed using DiSC(3)-5 and Sytox green, Syto-9, and PI dyes with fluorescence microscopy. Leakage of ATP and nucleic acids from cells were determined by analyzing the surrounding fluid. Attachment of the peptides resulted in increases in the percentage of nitrogen by 3.0% and 2.4%, and amino acid concentrations to 0.237 nmole and 0.298 nmole per coverslip on melimine and Mel4 coated surfaces, respectively. The immobilized peptides bound lipopolysaccharide and disrupted the cytoplasmic membrane potential of Pseudomonas aeruginosa within 15 min. Membrane depolarization was associated with a reduction in bacterial viability by 82% and 63% for coatings melimine and Mel4, respectively (p < 0.001). Disruption of membrane potential was followed by leakage of ATP from melimine (1.5 ± 0.4 nM) or Mel4 (1.3 ± 0.2 nM) coated surfaces compared to uncoated glass after 2 h (p < 0.001). Sytox green influx started after 3 h incubation with either peptide. Melimine coatings yielded 59% and Mel4 gave 36% PI stained cells after 4 h. Release of the larger molecules (DNA/RNA) commenced after 4 h for melimine (1.8 ± 0.9 times more than control; p = 0.008) and after 6 h with Mel4 (2.1 ± 0.2 times more than control; p < 0.001). The mechanism of action of surface bound melimine and Mel4 was similar to that of the peptides in solution, however, their immobilization resulted in much slower (approximately 30 times) kinetics.
Collapse
Affiliation(s)
- Muhammad Yasir
- School of Optometry and Vision Science, University of New South Wales, Sydney, NSW, Australia
| | - Debarun Dutta
- School of Optometry and Vision Science, University of New South Wales, Sydney, NSW, Australia
- Optometry and Vision Science, Optometry School, Aston University, Birmingham, United Kingdom
| | - Khondker R. Hossain
- School of Chemistry, The University of Sydney Nano Institute, The University of Sydney, Sydney, NSW, Australia
| | - Renxun Chen
- School of Chemistry, University of New South Wales, Sydney, NSW, Australia
| | - Kitty K. K. Ho
- School of Chemistry, University of New South Wales, Sydney, NSW, Australia
| | - Rajesh Kuppusamy
- School of Chemistry, University of New South Wales, Sydney, NSW, Australia
| | - Ronald J. Clarke
- School of Chemistry, The University of Sydney Nano Institute, The University of Sydney, Sydney, NSW, Australia
| | - Naresh Kumar
- School of Chemistry, University of New South Wales, Sydney, NSW, Australia
| | - Mark D. P. Willcox
- School of Optometry and Vision Science, University of New South Wales, Sydney, NSW, Australia
| |
Collapse
|
9
|
Overton K, Greer HM, Ferguson MA, Spain EM, Elmore DE, Núñez ME, Volle CB. Qualitative and Quantitative Changes to Escherichia coli during Treatment with Magainin 2 Observed in Native Conditions by Atomic Force Microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:650-659. [PMID: 31876422 PMCID: PMC7430157 DOI: 10.1021/acs.langmuir.9b02726] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The bacterial membrane has been suggested as a good target for future antibiotics, so it is important to understand how naturally occurring antibiotics like antimicrobial peptides (AMPs) disrupt those membranes. The interaction of the AMP magainin 2 (MAG2) with the bacterial cell membrane has been well characterized using supported lipid substrates, unilamellar vesicles, and spheroplasts created from bacterial cells. However, to fully understand how MAG2 kills bacteria, we must consider its effect on the outer membrane found in Gram-negative bacteria. Here, we use atomic force microscopy (AFM) to directly investigate MAG2 interaction with the outer membrane of Escherichia coli and characterize the biophysical consequences of MAG2 treatment under native conditions. While propidium iodide penetration indicates that MAG2 permeabilizes cells within seconds, a corresponding decrease in cellular turgor pressure is not observed until minutes after MAG2 application, suggesting that cellular homeostasis machinery may be responsible for helping the cell maintain turgor pressure despite a loss of membrane integrity. AFM imaging and force measurement modes applied in tandem reveal that the outer membrane becomes pitted, more flexible, and more adhesive after MAG2 treatment. MAG2 appears to have a highly disruptive effect on the outer membrane, extending the known mechanism of MAG2 to the Gram-negative outer membrane.
Collapse
Affiliation(s)
- Kanesha Overton
- Department of Biology , Cottey College , 1000 West Austin Boulevard , Nevada , Missouri 64772 , United States
| | - Helen M Greer
- Department of Biology , Cottey College , 1000 West Austin Boulevard , Nevada , Missouri 64772 , United States
| | - Megan A Ferguson
- Department of Chemistry , State University of New York , 1 Hawk Drive , New Paltz , New York 12561 , United States
| | - Eileen M Spain
- Department of Chemistry , Occidental College , 1600 Campus Road , Los Angeles , California 90041 , United States
| | - Donald E Elmore
- Department of Chemistry and Program in Biochemistry , Wellesley College , 106 Central Street , Wellesley , Massachusetts 02481 , United States
| | - Megan E Núñez
- Department of Chemistry and Program in Biochemistry , Wellesley College , 106 Central Street , Wellesley , Massachusetts 02481 , United States
| | - Catherine B Volle
- Department of Biology , Cottey College , 1000 West Austin Boulevard , Nevada , Missouri 64772 , United States
| |
Collapse
|
10
|
Mechanistic predictions of the influence of collagen-binding domain sequences on human LL37 interactions with model lipids using quartz crystal microbalance with dissipation. Biointerphases 2019; 14:021006. [PMID: 31039613 DOI: 10.1116/1.5089759] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Modifications of human-derived antimicrobial peptide LL37 with collagen binding domains (CBD-LL37) hold promise as alternatives to antibiotics due to their wider therapeutic ratio than unmodified LL37 when interacting with collagen substrates such as commercial wound dressings. However, CBD-LL37 lipid membrane interaction mechanisms (against both mammalian and bacterial lipids) are not well understood. Our goal was to develop a mechanistic explanation of how CBDs modulate peptide-lipid interactions leading to their observed bioactivities, in order to better understand their potential for clinical applications. The authors studied time- and concentration-dependent interactions of CBD-LL37 modified with collagenase (cCBD) and fibronectin (fCBD) CBDs, with zwitterionic and anionic supported lipid bilayers, in order to model mammalian erythrocytes and bacterial cells, respectively. Quartz crystal microbalance with dissipation monitoring (QCM-D) was used to characterize peptide-lipid interactions at concentrations in the immunomodulatory (0.5-1.0 μM), antimicrobial (1.0-5.0 μM), and cytotoxic (5.0-10.0 μM) ranges. Their prior work with zwitterionic membranes demonstrated that cCBD-LL37 formed transmembrane pores while fCBD-LL37 underwent surface adsorption. Our goal in this study is to better interpret these results, by investigating the data at a wider concentration range and for two types of lipids, and by applying the Voigt-Kelvin viscoelastic model to calculate thickness and density changes of the peptide-lipid films as a function of time and concentration, thus providing information to help build detailed mechanisms of peptide/bilayer interactions. For pore-forming cCBD-LL37 and unmodified LL37, they found that there was a relationship between layer thicknesses and pore formation, which was attributed to different peptide orientation changes influenced by bilayer charge prior to pore formation. Specifically, cCBD-LL37 at 0.5 and 1.0 μM demonstrated higher thicknesses on zwitterionic than anionic membranes, indicating that prior to insertion into zwitterionic membranes, it orients perpendicular to the surface, which was also consistent with the higher dissipation changes observed on zwitterionic membranes. fCBD-LL37 demonstrated a bilayer adsorption mechanism with a preference toward anionic lipids. Adsorption of fCBD-LL37 onto anionic lipids demonstrated a rapid first adsorption step that transitioned depending on the number of fCBD-LL37 molecules on the bilayer. For this peptide at higher concentrations, greater dissipation changes were observed than for fCBD-LL37 physically adsorbed onto surfaces without bilayers. This suggests that peptide-peptide interactions promoted by the fCBD domain dominated after saturation. The development of a structure-function relationship for cCBD-LL37 and fCBD-LL37 demonstrates promise for using QCM-D predictions to inform the rational design of novel, antimicrobial, and noncytotoxic CBD-LL37 for clinical applications.
Collapse
|
11
|
QCM-D characterization of time-dependence of bacterial adhesion. ACTA ACUST UNITED AC 2019; 5:100024. [PMID: 32743140 PMCID: PMC7389184 DOI: 10.1016/j.tcsw.2019.100024] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 01/29/2019] [Accepted: 03/29/2019] [Indexed: 12/22/2022]
Abstract
Quartz crystal microbalance with dissipation monitoring (QCM-D) is becoming an increasingly popular technique that can be employed as part of experimental and modeling investigations of bacterial adhesion. The usefulness of QCM-D derives from this technique's ability to probe binding and interactions under dynamic conditions, in real time. Bacterial adhesion is an important first step in the formation of biofilms, the control of which is relevant to industries that include shipping, water purification, packaging, and biomedical devices. However, many questions remain unanswered in the bacterial adhesion process, despite extensive research in this area. With QCM-D, multiple variables affecting bacterial adhesion can be studied, including the roles of substrate composition, chemical modification, solution ionic strength, environmental temperature, shear conditions, and time. Recent studies demonstrate the utility of QCM-D in developing new bacterial adhesion models and studying different stages of biofilm formation. We provide a review of how QCM-D has been used to study bacterial adhesion at stages ranging from the first step of bacterial adhesion to mature biofilms, and how QCM-D studies are being used to promote the development of solutions to biofilm formation.
Collapse
|
12
|
Shtreimer Kandiyote N, Avisdris T, Arnusch CJ, Kasher R. Grafted Polymer Coatings Enhance Fouling Inhibition by an Antimicrobial Peptide on Reverse Osmosis Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:1935-1943. [PMID: 30576152 DOI: 10.1021/acs.langmuir.8b03851] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Bacterial biofilms that are formed on surfaces are highly detrimental to many areas of industry and medicine. Seawater desalination by reverse osmosis (RO) suffers from biofilm growth on the membranes (biofouling), which limits its widespread use because biofouling decreases water permeance and necessitates module cleaning and replacement, leading to increased economic and environmental costs. Antimicrobial peptides (AMPs) bound covalently to RO membranes inhibit biofilm growth and might delay membrane biofouling. Here we examined how various hydrophilic membrane coatings composed of zwitterionic, neutral, positively charged, and poly(ethylene glycol) (PEG)-grafted polymers affected the biocidal activity and the biofilm inhibition of a covalently bonded AMP on RO membranes. AMP magainin-2 was linked by the copper-catalyzed azide-alkyne cycloaddition reaction to a series of RO membranes that were grafted with different methacrylate polymers. Surface characterization by infrared spectroscopy, X-ray photoelectron spectroscopy, and water drop contact angle gave evidence of successful RO modifications, and zeta potential analysis reflected the increase in surface charge due to the linked, positively charged peptide. All AMP-modified membranes inhibited Pseudomonas aeruginosa growth compared to unmodified membranes, and the grafted methacrylic polymers did not significantly interfere with the peptide activity. On the other hand, membranes coated with zwitterionic and other acrylate polymers including AMP attachment inhibited biofilm growth more than either the AMP or the polymer coating alone. This enhancement led to ∼20% less biofilm biovolume on the membrane surfaces. The combination of antimicrobial coatings with polymer coatings known to resist fouling might aid future designs of surface coatings susceptible to biofilm growth.
Collapse
Affiliation(s)
- Nitzan Shtreimer Kandiyote
- Department of Desalination and Water Treatment , Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev , Sede-Boqer Campus, 8499000 Midreshet Ben Gurion , Israel
| | - Tehila Avisdris
- Department of Desalination and Water Treatment , Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev , Sede-Boqer Campus, 8499000 Midreshet Ben Gurion , Israel
| | - Christopher J Arnusch
- Department of Desalination and Water Treatment , Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev , Sede-Boqer Campus, 8499000 Midreshet Ben Gurion , Israel
| | - Roni Kasher
- Department of Desalination and Water Treatment , Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev , Sede-Boqer Campus, 8499000 Midreshet Ben Gurion , Israel
| |
Collapse
|
13
|
Antimicrobial coatings prepared from Dhvar-5-click-grafted chitosan powders. Acta Biomater 2019; 84:242-256. [PMID: 30528610 DOI: 10.1016/j.actbio.2018.12.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 11/22/2018] [Accepted: 12/04/2018] [Indexed: 11/22/2022]
Abstract
Antimicrobial peptides (AMP) are powerful components of the innate immune system, as they display wide activity spectrum and low tendency to induce pathogen resistance. Hence, the development of AMP-based coatings is a very promising strategy to prevent biomaterials-associated infections. This work aims to investigate if Dhvar-5-chitosan conjugates, previously synthesized by us via azide-alkyne "click" reaction, can be applied as antimicrobial coatings. Ultrathin coatings were prepared by spin coater after dissolving Dhvar-5-chitosan conjugate powder in aqueous acetic acid. Peptide orientation and exposure from the surface was confirmed by ellipsometry and contact angle measurements. Bactericidal activity was evaluated against Staphylococcus epidermidis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, the most prevalent pathogens in implant-associated infections. Results showed that Dhvar-5-chitosan coatings displayed bactericidal effect. Moreover, since Dhvar-5 has head-to-tail amphipathicity, it was clear that the bactericidal potency was dependent on which domain of the peptide (cationic or hydrophobic) was exposed. In this context, Dhvar-5 immobilized through its C-terminus (exposing its hydrophobic end) presented higher antimicrobial activity against Gram-positive bacteria and reduced adhesion of Gram-negative bacteria. This orientation-dependent antimicrobial activity was further corroborated by the anti-biofilm assay, as covalent immobilization of Dhvar-5 through its C-terminus provided anti-biofilm properties to the chitosan thin film. Immobilization of Dhvar-5 showed no cytotoxic effect against HFF-1 cells, as both metabolic activity and cell morphology were similar to control. In conclusion, Dhvar-5-chitosan coatings are promising antimicrobial surfaces without cytotoxic effects against human cells. STATEMENT OF SIGNIFICANCE: AMP-tethering onto ground biomaterial is still a poorly explored strategy in research. In this work, AMP-tethered ground chitosan is used to produce highly antibacterial ultrathin films. Powdered AMP-tethered chitosan appears as an alternative solution for antimicrobial devices production, as it is suitable for large scale production, being easier to handle for fabrication of different coatings and materials with antimicrobial properties and without inducing toxicity.
Collapse
|
14
|
Mohanraj G, Mao C, Armine A, Kasher R, Arnusch CJ. Ink-Jet Printing-Assisted Modification on Polyethersulfone Membranes Using a UV-Reactive Antimicrobial Peptide for Fouling-Resistant Surfaces. ACS OMEGA 2018; 3:8752-8759. [PMID: 31459007 PMCID: PMC6644663 DOI: 10.1021/acsomega.8b00916] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Accepted: 07/17/2018] [Indexed: 05/29/2023]
Abstract
Antimicrobial peptides (AMPs) are promising candidates for surface coatings to control biofilm growth on water treatment membranes because of their broad activity and the low tendency of bacteria to develop resistance to AMPs. However, general and convenient surface modification methods are limited, and a deeper understanding of the antimicrobial mechanism of action is needed for surface-attached AMPs. Here, we show a method for covalently attaching AMPs on porous ultrafiltration membranes using ink-jet printing and provide insight into the mode of action for the covalently tethered peptide RWRWRWA-(Bpa) (Bpa, 4-benzophenylalanine) against Pseudomonas aeruginosa. AMP-coated ultrafiltration membranes showed surface antibacterial activity and reduced biofilm growth. Fluorescence microscopy analysis revealed that the modified surfaces could cause cell membrane disruption, which was seen by live uptake of propidium iodide stain, and scanning electron microscopy images showed compromised cell membranes of attached bacteria. This study indicated that the mode of action of covalently tethered AMPs was similar to that of freely soluble AMPs. The deeper understanding of the mode of action of AMPs covalently attached to surfaces could lead to a more rational approach for designing surfaces with antibacterial activity.
Collapse
Affiliation(s)
- Gunasekaran Mohanraj
- Department
of Desalination and Water Treatment, Zuckerberg Institute
for Water Research, The Jacob Blaustein Institutes for Desert Research, and Microalgal Biotechnology
Laboratory, French Associates Institute for Agriculture and Biotechnology
of Drylands, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede-Boqer Campus, Midreshet
Ben Gurion 84990, Israel
| | - Canwei Mao
- Department
of Desalination and Water Treatment, Zuckerberg Institute
for Water Research, The Jacob Blaustein Institutes for Desert Research, and Microalgal Biotechnology
Laboratory, French Associates Institute for Agriculture and Biotechnology
of Drylands, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede-Boqer Campus, Midreshet
Ben Gurion 84990, Israel
| | - Asatryan Armine
- Department
of Desalination and Water Treatment, Zuckerberg Institute
for Water Research, The Jacob Blaustein Institutes for Desert Research, and Microalgal Biotechnology
Laboratory, French Associates Institute for Agriculture and Biotechnology
of Drylands, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede-Boqer Campus, Midreshet
Ben Gurion 84990, Israel
| | - Roni Kasher
- Department
of Desalination and Water Treatment, Zuckerberg Institute
for Water Research, The Jacob Blaustein Institutes for Desert Research, and Microalgal Biotechnology
Laboratory, French Associates Institute for Agriculture and Biotechnology
of Drylands, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede-Boqer Campus, Midreshet
Ben Gurion 84990, Israel
| | - Christopher J. Arnusch
- Department
of Desalination and Water Treatment, Zuckerberg Institute
for Water Research, The Jacob Blaustein Institutes for Desert Research, and Microalgal Biotechnology
Laboratory, French Associates Institute for Agriculture and Biotechnology
of Drylands, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede-Boqer Campus, Midreshet
Ben Gurion 84990, Israel
| |
Collapse
|
15
|
Lozeau LD, Youssefian S, Rahbar N, Camesano TA, Rolle MW. Concentration-Dependent, Membrane-Selective Activity of Human LL37 Peptides Modified with Collagen Binding Domain Sequences. Biomacromolecules 2018; 19:4513-4523. [DOI: 10.1021/acs.biomac.8b00802] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
16
|
Lozeau LD, Rolle MW, Camesano TA. A QCM-D study of the concentration- and time-dependent interactions of human LL37 with model mammalian lipid bilayers. Colloids Surf B Biointerfaces 2018; 167:229-238. [PMID: 29660601 DOI: 10.1016/j.colsurfb.2018.04.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 03/05/2018] [Accepted: 04/04/2018] [Indexed: 10/17/2022]
Abstract
The human antimicrobial peptide LL37 is promising as an alternative to antibiotics due to its biophysical interactions with charged bacterial lipids. However, its clinical potential is limited due to its interactions with zwitterionic mammalian lipids leading to cytotoxicity. Mechanistic insight into the LL37 interactions with mammalian lipids may enable rational design of less toxic LL37-based therapeutics. To this end, we studied concentration- and time-dependent interactions of LL37 with zwitterionic model phosphatidylcholine (PC) bilayers with quartz crystal microbalance with dissipation (QCM-D). LL37 mass adsorption and PC bilayer viscoelasticity changes were monitored by measuring changes in frequency (Δf) and dissipation (ΔD), respectively. The Voigt-Kelvin viscoelastic model was applied to Δf and ΔD to study changes in bilayer thickness and density with LL37 concentration. At low concentrations (0.10-1.00 μM), LL37 adsorbed onto bilayers in a concentration-dependent manner. Further analyses of Δf, ΔD and thickness revealed that peptide saturation on the bilayers was a threshold for interactions observed above 2.00 μM, interactions that were rapid, multi-step, and reached equilibrium in a concentration- and time-dependent manner. Based on these data, we proposed a model of stable transmembrane pore formation at 2.00-10.0 μM, or transition from a primarily lipid to a primarily protein film with a transmembrane pore formation intermediate state at concentrations of LL37 > 10 μM. The concentration-dependent interactions between LL37 and PC bilayers correlated with the observed concentration-dependent biological activities of LL37 (antimicrobial, immunomodulatory and non-cytotoxic at 0.1-1.0 μM, hemolytic and some cytotoxicity at 2.0-13 μM and cytotoxic at >13 μM).
Collapse
Affiliation(s)
- Lindsay D Lozeau
- Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA
| | - Marsha W Rolle
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA
| | - Terri A Camesano
- Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA.
| |
Collapse
|
17
|
Lozeau LD, Grosha J, Kole D, Prifti F, Dominko T, Camesano TA, Rolle MW. Collagen tethering of synthetic human antimicrobial peptides cathelicidin LL37 and its effects on antimicrobial activity and cytotoxicity. Acta Biomater 2017; 52:9-20. [PMID: 28017866 DOI: 10.1016/j.actbio.2016.12.047] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Revised: 12/05/2016] [Accepted: 12/21/2016] [Indexed: 12/22/2022]
Abstract
Wound infections, particularly of chronic wounds, pose a substantial challenge for designing antimicrobial dressings that are both effective against pathogens, and do not interfere with wound healing. Due to their broad-spectrum antimicrobial and immunomodulatory activities, naturally-occurring antimicrobial peptides (AMPs) are promising alternative treatments. However, their cytotoxicity at high concentrations and poor stability hinders their clinical use. To mitigate these undesirable properties, we investigated the effects of tethering human AMP cathelicidin LL37 to collagen, one of the main extracellular matrix proteins in wound sites, secreted by fibroblasts, and in commercially-available wound dressings. The active domain of human AMP cathelicidin, LL37, and two chimeric peptides containing LL37 fused to collagen binding domains (derived from collagenase - cCBD-LL37 or fibronectin - fCBD-LL37) were synthesized and adsorbed to PURACOL® type I collagen scaffolds. After 14days, 73%, 81% and 99% of LL37, cCBD-LL37 and fCBD-LL37, respectively, was retained on the scaffolds and demonstrated undiminished antimicrobial activity when challenged with both Gram-positive and Gram-negative bacterial strains. Loaded scaffolds were not cytotoxic to fibroblasts despite retaining peptides at concentrations 24 times higher than the reported cytotoxic concentrations in solution. These findings indicate that biopolymer-tethered AMPs may represent a viable alternative for preventing and treating wound infection while also supporting tissue repair. STATEMENT OF SIGNIFICANCE Over 6.5million people annually in the United States suffer chronic wounds; many will become infected with antibiotic-resistant bacteria. Treatments used to prevent and fight infection are toxic and may hinder wound healing. AMPs are broad-spectrum antimicrobials that also promote healing; however, their instability and toxicity are major challenges. To overcome treatment gaps, we functionalized collagen scaffolds with chimeric antimicrobial peptides (AMPs) with collagen binding domains to create antimicrobial and non-cytotoxic scaffolds that may promote healing. This is the first report of CBD-mediated delivery of AMPs onto collagen scaffolds that demonstrates no cytotoxicity toward fibroblasts. This study also suggests that retention of antimicrobial activity is CBD-dependent, which provides foundations for fundamental studies of CBD-AMP mechanisms and clinical explorations.
Collapse
Affiliation(s)
- Lindsay D Lozeau
- Dept. of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States
| | - Jonian Grosha
- Dept. of Biomedical Engineering, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milan, Italy; Dept. of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States
| | - Denis Kole
- Dept. of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States; Dept. of Biology and Biotechnology, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States
| | - Fioleda Prifti
- Dept. of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States; Dept. of Chemistry and Biochemistry, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States
| | - Tanja Dominko
- Dept. of Biology and Biotechnology, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States; Center for Biomedical Sciences and Engineering, University of Nova Gorica, Vipavska cesta, 5000 Nova Gorica, Slovenia
| | - Terri A Camesano
- Dept. of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States
| | - Marsha W Rolle
- Dept. of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States.
| |
Collapse
|
18
|
Wong DSH, Li J, Yan X, Wang B, Li R, Zhang L, Bian L. Magnetically Tuning Tether Mobility of Integrin Ligand Regulates Adhesion, Spreading, and Differentiation of Stem Cells. NANO LETTERS 2017; 17:1685-1695. [PMID: 28233497 DOI: 10.1021/acs.nanolett.6b04958] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Cells sense and respond to the surrounding microenvironment through binding of membranous integrin to ligands such as the Arg-Gly-Asp (RGD) peptide. Previous studies show that the RGD tether properties on substrate influence cell adhesion and spreading, but few studies have reported strategies to control the tether mobility of RGD on substrate via a physical and noncontact approach. Herein, we demonstrate a novel strategy to tune the tether mobility of RGD on substrate via magnetic force. We conjugate a monolayer of RGD-bearing magnetic nanoparticles (MNPs) on a glass substrate via the flexible and coiled poly(ethylene glycol) linker of large molecular weight (PEG, average MW: 2000), and this increases the RGD tether mobility, which can be significantly reduced by applying magnetic attraction on MNPs. Our data show that high RGD tether mobility delays the early adhesion and spreading of human mesenchymal stem cells (hMSCs), leading to compromised osteogenic differentiation at later stage. In contrast, hMSCs cultured on substrate with restricted RGD tether mobility, achieved either via a shorter PEG linker (MW: 200) or magnetic force, show significantly better adhesion, spreading, and osteogenic differentiation. The control utilizing RGD-bearing nonmagnetic nanoparticles shows no such enhancing effect of magnetic field on cellular events, further supporting our conjecture of magnetic tuning of RGD tether mobility. We hypothesize that high tether mobility of RGD entails additional time and effort by the cells to fully develop traction force and mechanical feedback, thereby delaying the maturation of FAs and activation of subsequent mechanotransduction signaling. Our staining results of vinculin, a critical component of FAs, and Yes-associated protein (YAP), an important mechanosensitive transcriptional factor, support our hypothesis. We believe that our work not only sheds light on the impact of dynamic presentation of cell adhesive ligands on cellular behaviors, which should be taken into consideration for designing novel biomaterials, but also formulate an effective noncontact strategy that enables further investigation on the mechanobiological mechanisms underlying such cellular responses.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Liming Bian
- Shenzhen Research Institute, The Chinese University of Hong Kong , Hong Kong, China
- China Orthopedic Regenerative Medicine Group (CORMed), Hangzhou, China
- Centre for Novel Biomaterials, The Chinese University of Hong Kong , Hong Kong, China
| |
Collapse
|
19
|
Cole MA, Scott TF, Mello CM. Bactericidal Hydrogels via Surface Functionalization with Cecropin A. ACS Biomater Sci Eng 2016; 2:1894-1904. [PMID: 33440526 DOI: 10.1021/acsbiomaterials.6b00266] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The immobilization of antimicrobial peptides (AMPs) to surfaces, enabling their utilization in biosensor and antibacterial/antifouling coating applications, is typically performed using rigid, solid support materials such as glass or gold and may require lengthy, temperamental protocols. Here, we employ a hydrogel immobilization platform to afford facile fabrication and surface functionalization while offering improved biocompatibility for evaluating the influence of linker length, surface density, and AMP conjugation site on retained peptide activity. Rapid, interfacial photo-polymerization using the radical-mediated thiol-ene addition mechanism was used to generate cross-linked, polymeric coatings bearing residual thiol moieties on prefabricated poly(ethylene glycol) (PEG)-based hydrogel supports. The photo-polymerized coatings were 60 μm thick and contained 0.55 nmol of unreacted free thiols, corresponding to a concentration of 410 μM, for use as cecropin A (CPA) immobilization handles via thiol-maleimide conjugation, where the CPA-bound maleimide moiety was localized at either the carboxyl terminus or midsequence between Ala22 and Gly23. Surface presentation of the thiol handles was controlled by varying the thiolated PEG monomer (PEGSH) used in the photo-polymerizable formulation. Bactericidal activity of CPA functionalized hydrogels against E. coli K235 indicated that CPA immobilized at the carboxyl terminus killed 94 ± 6% of the inoculated pathogens when coatings were prepared with high molecular weight PEGSH and 99 ± 1% when prepared with low molecular weight PEGSH. E. coli cell death demonstrated a stronger dependence on peptide concentration than PEG linker length or degree of thiol functionalization, with activity ranging from 34 ± 13% to 99 ± 1% bacterial cells killed as the prefunctionalization thiol concentration in the coatings was increased from 90 to 990 μM. Finally, the immobilization site on the surface-bound CPA strongly affected antibacterial activity; when midsequence modified CPA was bound to a hydrogel coating bearing 990 μM thiol, only 20 ± 4% of the E. coli population was killed.
Collapse
Affiliation(s)
- Megan A Cole
- U.S. Army Natick Soldier Research, Development, and Engineering Center, Natick, Massachusetts 01760, United States
| | - Timothy F Scott
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Macromolecular Science and Engineering Program, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Charlene M Mello
- U.S. Army Natick Soldier Research, Development, and Engineering Center, Natick, Massachusetts 01760, United States
| |
Collapse
|
20
|
Bodner EJ, Kandiyote NS, Lutskiy MY, Albada HB, Metzler-Nolte N, Uhl W, Kasher R, Arnusch CJ. Attachment of antimicrobial peptides to reverse osmosis membranes by Cu(i)-catalyzed 1,3-dipolar alkyne–azide cycloaddition. RSC Adv 2016. [DOI: 10.1039/c6ra21930f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Optimized polymer membrane surface modification with antimicrobial properties.
Collapse
Affiliation(s)
- Elias J. Bodner
- Department of Desalination and Water Treatment
- Zuckerberg Institute for Water Research
- The Jacob Blaustein Institutes for Desert Research
- Ben-Gurion University of the Negev
- Israel
| | - Nitzan Shtreimer Kandiyote
- Department of Desalination and Water Treatment
- Zuckerberg Institute for Water Research
- The Jacob Blaustein Institutes for Desert Research
- Ben-Gurion University of the Negev
- Israel
| | - Marina-Yamit Lutskiy
- Department of Desalination and Water Treatment
- Zuckerberg Institute for Water Research
- The Jacob Blaustein Institutes for Desert Research
- Ben-Gurion University of the Negev
- Israel
| | - H. Bauke Albada
- Inorganic Chemistry I
- Bioinorganic Chemistry
- Faculty of Chemistry and Biochemistry
- Ruhr-Universität Bochum
- 44801 Bochum
| | - Nils Metzler-Nolte
- Inorganic Chemistry I
- Bioinorganic Chemistry
- Faculty of Chemistry and Biochemistry
- Ruhr-Universität Bochum
- 44801 Bochum
| | - Wolfgang Uhl
- Norwegian Institute for Water Research (NIVA)
- 0349 Oslo
- Norway
- Chair of Water Supply Engineering
- Technische Universität Dresden
| | - Roni Kasher
- Department of Desalination and Water Treatment
- Zuckerberg Institute for Water Research
- The Jacob Blaustein Institutes for Desert Research
- Ben-Gurion University of the Negev
- Israel
| | - Christopher J. Arnusch
- Department of Desalination and Water Treatment
- Zuckerberg Institute for Water Research
- The Jacob Blaustein Institutes for Desert Research
- Ben-Gurion University of the Negev
- Israel
| |
Collapse
|