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Boden A, Dart A, Liao TY, Zhu DM, Bhave M, Cipolla L, Kingshott P. Enhancing the Activity of Surface Immobilized Antimicrobial Peptides Using Thiol-Mediated Tethering to Poly(ethylene glycol). Macromol Biosci 2023; 23:e2200411. [PMID: 37167630 DOI: 10.1002/mabi.202200411] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 01/19/2023] [Indexed: 05/13/2023]
Abstract
Considering the need for versatile surface coatings that can display multiple bioactive signals and chemistries, the use of more novel surface modification methods is starting to emerge. Thiol-mediated conjugation of biomolecules is shown to be quite advantageous for such purposes due to the reactivity and chemoselectivity of thiol functional groups. Herein, the immobilization of poly(ethylene glycol) (PEG) and antimicrobial peptides (AMPs) to silica colloidal particles based on thiol-mediated conjugation techniques, along with an assessment of the antimicrobial potential of the functionalized particles against Pseudomonas aeruginosa and Staphylococcus aureus is investigated. Immobilization of PEG to thiolated Si particles is performed by either a two-step thiol-ene "photo-click" reaction or a "one-pot" thiol-maleimide type conjugation using terminal acrylate or maleimide functional groups, respectively. It is demonstrated that both immobilization methods result in a significant reduction in the number of viable bacterial cells compared to unmodified samples after the designated incubation periods with the PEG-AMP-modified colloidal suspensions. These findings provide a promising outlook for the fabrication of multifunctional surfaces based upon the tethering of PEG and AMPs to colloidal particles through thiol-mediated biocompatible chemistry, which has potential for use as implant coatings or as antibacterial formulations that can be incorporated into wound dressings to prevent or control bacterial infections.
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Affiliation(s)
- Andrew Boden
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
- ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Engineering, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Alexander Dart
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Tzu-Ying Liao
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
- ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Engineering, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - De Ming Zhu
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Mrinal Bhave
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Laura Cipolla
- Department of Biotechnology and Biosciences, University of Milano - Bicocca, Piazza della Scienza 2, Milano, 20126, Italy
| | - Peter Kingshott
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
- ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Engineering, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
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2
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Wang L, Schubert US, Hoeppener S. Surface chemical reactions on self-assembled silane based monolayers. Chem Soc Rev 2021; 50:6507-6540. [PMID: 34100051 DOI: 10.1039/d0cs01220c] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In this review, we aim to update our review "Chemical modification of self-assembled silane-based monolayers by surface reactions" which was published in 2010 and has developed into an important guiding tool for researchers working on the modification of solid substrate surface properties by chemical modification of silane-based self-assembled monolayers. Due to the rapid development of this field of research in the last decade, the utilization of chemical functionalities in self-assembled monolayers has been significantly improved and some new processes were introduced in chemical surface reactions for tailoring the properties of solid substrates. Thus, it is time to update the developments in the surface functionalization of silane-based molecules. Hence, after a short introduction on self-assembled monolayers, this review focuses on a series of chemical reactions, i.e., nucleophilic substitution, click chemistry, supramolecular modification, photochemical reaction, and other reactions, which have been applied for the modification of hydroxyl-terminated substrates, like silicon and glass, which have been reported during the last 10 years.
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Affiliation(s)
- Limin Wang
- Laboratory of Organic Chemistry and Macromolecular Chemistry (IOMC), Friedrich Schiller University, Humboldtstr. 10, 07743 Jena, Germany
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3
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Chen J, Hu G, Li T, Chen Y, Gao M, Li Q, Hao L, Jia Y, Wang L, Wang Y. Fusion peptide engineered "statically-versatile" titanium implant simultaneously enhancing anti-infection, vascularization and osseointegration. Biomaterials 2020; 264:120446. [PMID: 33069134 DOI: 10.1016/j.biomaterials.2020.120446] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 10/07/2020] [Accepted: 10/08/2020] [Indexed: 12/12/2022]
Abstract
Although antimicrobial titanium implants can prevent biomaterial-associated infection (BAI) in orthopedics, they display cytotoxicity and delayed osseointegration. Therefore, versatile implants are desirable for simultaneously inhibiting BAI and promoting osseointegration, especially "statically-versatile" ones with nonessential external stimulations for facilitating applications. Herein, we develop a "statically-versatile" titanium implant by immobilizing an innovative fusion peptide (FP) containing HHC36 antimicrobial sequence and QK angiogenic sequence via sodium borohydride reduction promoted Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC-SB), which shows higher immobilization efficiency than traditional CuAAC with sodium ascorbate reduction (CuAAC-SA). The FP-engineered implant exhibits over 96.8% antimicrobial activity against four types of clinical bacteria (S. aureus, E. coli, P. aeruginosa and methicillin-resistant S. aureus), being stronger than that modified with mixed peptides. This can be mechanistically attributed to the larger bacterial accessible surface area of HHC36 sequence. Notably, the implant can simultaneously enhance cellular proliferation, up-regulate expressions of angiogenesis-related genes/proteins (VEGF and VEGFR-2) of HUVECs and osteogenesis-related genes/proteins (ALP, COL-1, RUNX-2, OPN and OCN) of hBMSCs. In vivo assay with infection and non-infection bone-defect model reveals that the FP-engineered implant can kill 99.63% of S. aureus, and simultaneously promote vascularization and osseointegration. It is believed that this study presents an excellent strategy for developing "statically-versatile" orthopedic implants.
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Affiliation(s)
- Junjian Chen
- Key Laboratory of Biomedical Engineering of Guangdong Province, South China University of Technology, Guangzhou, 510006, China; Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, 510006, China
| | - Guansong Hu
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, China; School of Biomedical Science and Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Tianjie Li
- Key Laboratory of Biomedical Engineering of Guangdong Province, South China University of Technology, Guangzhou, 510006, China
| | - Yunhua Chen
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, China
| | - Meng Gao
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, China; School of Biomedical Science and Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Qingtao Li
- Key Laboratory of Biomedical Engineering of Guangdong Province, South China University of Technology, Guangzhou, 510006, China; Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, 510006, China
| | - Lijing Hao
- School of Biomedical Science and Engineering, South China University of Technology, Guangzhou, 510006, China; Key Laboratory of Biomedical Engineering of Guangdong Province, South China University of Technology, Guangzhou, 510006, China
| | - Yongguang Jia
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, China
| | - Lin Wang
- Key Laboratory of Biomedical Engineering of Guangdong Province, South China University of Technology, Guangzhou, 510006, China; Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, 510006, China.
| | - Yingjun Wang
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, China; School of Biomedical Science and Engineering, South China University of Technology, Guangzhou, 510006, China.
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Amin Yavari S, Castenmiller SM, van Strijp JAG, Croes M. Combating Implant Infections: Shifting Focus from Bacteria to Host. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2002962. [PMID: 32914481 DOI: 10.1002/adma.202002962] [Citation(s) in RCA: 76] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/28/2020] [Indexed: 05/06/2023]
Abstract
The widespread use of biomaterials to support or replace body parts is increasingly threatened by the risk of implant-associated infections. In the quest for finding novel anti-infective biomaterials, there generally has been a one-sided focus on biomaterials with direct antibacterial properties, which leads to excessive use of antibacterial agents, compromised host responses, and unpredictable effectiveness in vivo. This review sheds light on how host immunomodulation, rather than only targeting bacteria, can endow biomaterials with improved anti-infective properties. How antibacterial surface treatments are at risk to be undermined by biomaterial features that dysregulate the protection normally provided by critical immune cell subsets, namely, neutrophils and macrophages, is discussed. Accordingly, how the precise modification of biomaterial surface biophysical cues, or the incorporation of immunomodulatory drug delivery systems, can render biomaterials with the necessary immune-compatible and immune-protective properties to potentiate the host defense mechanisms is reviewed. Within this context, the protective role of host defense peptides, metallic particles, quorum sensing inhibitors, and therapeutic adjuvants is discussed. The highlighted immunomodulatory strategies may lay a foundation to develop anti-infective biomaterials, while mitigating the increasing threat of antibacterial drug resistance.
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Affiliation(s)
- Saber Amin Yavari
- Department of Orthopedics, University Medical Center Utrecht, Utrecht, 3508GA, The Netherlands
| | - Suzanne M Castenmiller
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, 3508GA, The Netherlands
| | - Jos A G van Strijp
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, 3508GA, The Netherlands
| | - Michiel Croes
- Department of Orthopedics, University Medical Center Utrecht, Utrecht, 3508GA, The Netherlands
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5
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Prevention of urinary catheter-associated infections by coating antimicrobial peptides from crowberry endophytes. Sci Rep 2019; 9:10753. [PMID: 31341199 PMCID: PMC6656713 DOI: 10.1038/s41598-019-47108-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 06/24/2019] [Indexed: 11/08/2022] Open
Abstract
Urinary catheters are extensively used in hospitals, being responsible for about 75% of hospital-acquired infections. In this work, a de novo designed antimicrobial peptide (AMP) Chain201D was studied in the context of urinary catheter-associated infections. Chain201D showed excellent antimicrobial activity against relevant ATCC strains and clinical isolates of bacteria and yeast and demonstrated high stability in a wide range of temperatures, pH and salt concentrations. Moreover, the bactericidal activity of Chain201D immobilized on a model surface was studied against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), some of the most prevalent strains found in urinary catheter-associated infections. Chain201D was successfully tethered to ((1-mercapto-11-undecyl)-(tetra(ethylene glycol) (EG4)) terminated self-assembled monolayers (SAMs), (EG4-SAMs), activated by 1,1'-Carbonyldiimidazole (CDI) at different concentrations. Chain201D surfaces can bind and kill by contact a high percentage of adherent bacteria. These achievements are obtained without any peptide modification (for chemoselective conjugation) and without the use of a spacer. Moreover, increased amounts of immobilized AMP lead to higher numbers of adhered/dead bacteria, revealing a concentration-dependent behaviour and demonstrating that Chain201D has excellent potential for developing antimicrobial urinary catheters.
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Shen W, He P, Xiao C, Chen X. From Antimicrobial Peptides to Antimicrobial Poly(α-amino acid)s. Adv Healthc Mater 2018; 7:e1800354. [PMID: 29923332 DOI: 10.1002/adhm.201800354] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 05/22/2018] [Indexed: 01/17/2023]
Abstract
Conventional small-molecule antibiotics are facing a significant challenge of the rapidly developed drug resistance of pathogens. In contrast, antimicrobial peptides (AMPs), an important component for innate host defenses, are now under intensive investigation as a promising antimicrobial agent for combating drug resistant pathogens. Most AMPs can effectively kill a broad spectrum of pathogens via physical disruption of microbial cellular membranes, which is identified to be difficult to develop resistance. However, the clinical applications of AMPs are still greatly limited by several inherent impediments, such as high cost of production, potential hemolysis or toxicity, and liability to proteinase degradation. Recently, cationic poly(α-amino acid)s with structures mimicking the AMPs are found to have excellent antimicrobial activity. These polymers, termed "antimicrobial poly(α-amino acid)s (APAAs)," have some advantages over AMPs, such as easy production and modification, prolonged antimicrobial activity, low cytotoxicity, and enhanced stability to protease degradation. Here, a brief introduction of mechanisms and affecting factors of microbial killing by AMPs is first presented, followed by a systematic illustration of recent advances in design and preparation of biomimetic APAAs and a perspective in this field.
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Affiliation(s)
- Wei Shen
- Key Laboratory of Polymer Ecomaterials; Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P. R. China
- University of Chinese Academy of Sciences; 19A Yuquan Road Beijing 100049 P. R. China
| | - Pan He
- School of Materials Science and Engineering; Changchun University of Science and Technology; Changchun 130022 P. R. China
| | - Chunsheng Xiao
- Key Laboratory of Polymer Ecomaterials; Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P. R. China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials; Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P. R. China
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7
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Boden A, Bhave M, Wang PY, Jadhav S, Kingshott P. Binary Colloidal Crystal Layers as Platforms for Surface Patterning of Puroindoline-Based Antimicrobial Peptides. ACS APPLIED MATERIALS & INTERFACES 2018; 10:2264-2274. [PMID: 29281884 DOI: 10.1021/acsami.7b10392] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The ability of bacteria to form biofilms and the emergence of antibiotic-resistant strains have prompted the need to develop the next generation of antibacterial coatings. Antimicrobial peptides (AMPs) are showing promise as molecules that can address these issues, especially if used when immobilized as a surface coating. We present a method that explores how surface patterns together with the selective immobilization of an AMP called PuroA (FPVTWRWWKWWKG-NH2) can be used to both kill bacteria and also as a tool to study bacterial attachment mechanisms. Surface patterning is achieved using stabilized self-assembled binary colloidal crystal (BCC) layers, allowing selective PuroA immobilization to carboxylated particles using N-(3-dimethylaminopropyl)-N'-ethyl carbodiimide (EDC) hydrochloride/N-hydroxysuccinimide (NHS) coupling chemistry. Covalent immobilization of PuroA was compared with physical adsorption (i.e., without the addition of EDC/NHS). The AMP-functionalized colloids and BCC layers were characterized by X-ray photoelectron spectroscopy, ζ potentials, and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). Surface antimicrobial activity was assessed by viability assays using Escherichia coli. MALDI-TOF MS analysis revealed that although not all of PuroA was successfully covalently immobilized, a relatively low density of PuroA (1.93 × 1013 molecules/cm2 and 7.14 × 1012 molecules/cm2 for covalent and physical immobilization, respectively) was found to be sufficient at significantly decreasing the viability of E. coli by 70% when compared to that of control samples. The findings provide a proof of concept that BCC layers are a suitable platform for the patterned immobilization of AMPs and the importance of ascertaining the success of small-molecule grafting reactions using surface-MALDI, something that is often assumed to be successful in the field.
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Affiliation(s)
- Andrew Boden
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn, 3122 VIC, Australia
| | - Mrinal Bhave
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn, 3122 VIC, Australia
| | - Peng-Yuan Wang
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn, 3122 VIC, Australia
| | - Snehal Jadhav
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn, 3122 VIC, Australia
| | - Peter Kingshott
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn, 3122 VIC, Australia
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8
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Mohammadi Ziarani G, Hassanzadeh Z, Gholamzadeh P, Asadi S, Badiei A. Advances in click chemistry for silica-based material construction. RSC Adv 2016. [DOI: 10.1039/c5ra26034e] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Click chemistry is undoubtedly the most powerful 1,3-dipolar cycloaddition reaction in organic synthesis.
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Affiliation(s)
| | | | | | - Shima Asadi
- Department of Chemistry
- Alzahra University
- Tehran
- Iran
| | - Alireza Badiei
- School of Chemistry
- College of Science
- University of Tehran
- Tehran
- Iran
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9
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Dutta D, Kumar N, D P Willcox M. Antimicrobial activity of four cationic peptides immobilised to poly-hydroxyethylmethacrylate. BIOFOULING 2016; 32:429-438. [PMID: 26934297 DOI: 10.1080/08927014.2015.1129533] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The objective of this study was to immobilise and characterise a variety of antimicrobial peptides (AMPs) onto poly-hydroxyethylmethacrylate (pHEMA) surfaces to achieve an antibacterial effect. Four AMPs, viz. LL-37, melimine, lactoferricin and Mel-4 were immobilised on pHEMA by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) which assisted covalent attachment. Increasing concentrations of AMPs were immobilised to determine the effect on the adhesion of Pseudomonas aeruginosa and Staphylococcus aureus. The AMP immobilised pHEMAs were characterised by X-ray photoelectron spectroscopy (XPS) to determine the surface elemental composition and by amino acid analysis to determine the total amount of AMP attached. In vitro cytotoxicity of the immobilised pHEMA samples to mouse L929 cells was investigated. Melimine and Mel-4 when immobilised at the highest concentrations showed 3.1 ± 0.6 log and 1.3 ± 0.2 log inhibition against P. aeruginosa, and 3.9 ± 0.6 log and 2.4 ± 0.5 log inhibition against S. aureus, respectively. Immobilisation of LL-37 resulted in up to 2.6 ± 1.0 log inhibition against only P. aeruginosa, but no activity against S. aureus. LFc attachment showed no antibacterial activity. Upon XPS analysis, immobilised melimine, LL-37, LFc and Mel-4 had 1.57 ± 0.38%, 1.13 ± 1.36%, 0.66 ± 0.47% and 0.73 ± 0.32% amide nitrogen attached to pHEMA compared to 0.12 ± 0.14% in the untreated controls. Amino acid analysis determined that the total amount of AMP attachment to pHEMA was 44.3 ± 7.4 nmol, 3.8 ± 0.2 nmol, 6.5 ± 0.6 nmol and 48.9 ± 2.3 nmol for the same peptides respectively. None of the AMP immobilised pHEMA surfaces showed any toxicity towards mouse L929 cells. The immobilisation of certain AMPs at nanomolar concentration to pHEMA is an effective option to develop a stable antimicrobial surface.
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Affiliation(s)
- Debarun Dutta
- a School of Optometry and Vision Science , University of New South Wales , Sydney , Australia
| | - Naresh Kumar
- b School of Chemistry , University of New South Wales , Sydney , Australia
| | - Mark D P Willcox
- a School of Optometry and Vision Science , University of New South Wales , Sydney , Australia
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10
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Soares JW, Kirby R, Doherty LA, Meehan A, Arcidiacono S. Immobilization and orientation-dependent activity of a naturally occurring antimicrobial peptide. J Pept Sci 2015; 21:669-79. [DOI: 10.1002/psc.2787] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 03/10/2015] [Accepted: 04/27/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Jason W. Soares
- U.S. Army Natick Soldier Research, Development and Engineering Center; Natick MA 01760 USA
| | - Romy Kirby
- U.S. Army Natick Soldier Research, Development and Engineering Center; Natick MA 01760 USA
| | - Laurel A. Doherty
- U.S. Army Natick Soldier Research, Development and Engineering Center; Natick MA 01760 USA
| | - Alexa Meehan
- U.S. Army Natick Soldier Research, Development and Engineering Center; Natick MA 01760 USA
| | - Steven Arcidiacono
- U.S. Army Natick Soldier Research, Development and Engineering Center; Natick MA 01760 USA
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11
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Qin GT, Lopez A, Santos C, McDermott AM, Cai CZ. Antimicrobial peptide LL-37 on surfaces presenting carboxylate anions. Biomater Sci 2015. [PMID: 26222596 DOI: 10.1039/c5bm00055f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Antimicrobial peptides (AMPs) are part of the immune system in a wide range of organisms. They generally carry positive charges under physiological conditions, allowing them to accumulate on the negatively charged bacterial membrane as the first step of bactericidal action. The concentration range of AMPs necessary for rapid killing of bacteria tested in vitro is much higher than levels found at epithelial surfaces and body fluids in vivo, and close to the a level that is toxic to the host cells. It is likely that AMPs in vivo are localized and act cooperatively to enhance antimicrobial activity, while the global concentration is low thus demonstrating low toxicity to host cells. Herein we employed well-defined mixed self-assembled monolayers (SAMs) to localize LL-37, one of the most studied AMPs, via electrostatic interactions. We systematically varied the surface density of LL-37, and found that the immobilized AMPs not only attracted bacteria Pseudomonas aeruginosa to the surface, but also killed nearly all bacteria when above a threshold density. More significantly, the AMPs displayed low toxicity to human corneal epithelial cells. The results indicated that localization of AMPs on suitable polyanion substrates facilitated the bactericidal activity while minimizing the cytotoxicity of AMPs.
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Affiliation(s)
- G T Qin
- Department of Chemistry, University of Houston, Houston, Texas 77204, USA.
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12
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Murugan P, Krishnamurthy M, Jaisankar SN, Samanta D, Mandal AB. Controlled decoration of the surface with macromolecules: polymerization on a self-assembled monolayer (SAM). Chem Soc Rev 2015; 44:3212-43. [PMID: 25839067 DOI: 10.1039/c4cs00378k] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Polymer functionalized surfaces are important components of various sensors, solar cells and molecular electronic devices. In this context, the use of self-assembled monolayer (SAM) formation and subsequent reactions on the surface have attracted a lot of interest due to its stability, reliability and excellent control over orientation of functional groups. The chemical reactions to be employed on a SAM must ensure an effective functional group conversion while the reaction conditions must be mild enough to retain the structural integrity. This synthetic constraint has no universal solution; specific strategies such as "graft from", "graft to", "graft through" or "direct" immobilization approaches are employed depending on the nature of the substrate, polymer and its area of applications. We have reviewed current developments in the methodology of immobilization of a polymer in the first part of the article. Special emphasis has been given to the merits and demerits of certain methods. Another issue concerns the utility - demonstrated or perceived - of conjugated or non-conjugated macromolecules anchored on a functionally decorated SAM in the areas of material science and biotechnology. In the last part of the review article, we looked at the collective research efforts towards SAM-based polymer devices and identified major pointers of progress (236 references).
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Affiliation(s)
- P Murugan
- Polymer Division, Council of Scientific and Industrial Research (CSIR)-CLRI, Adyar, Chennai-600020, India.
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13
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Wang CF, Mäkilä EM, Bonduelle C, Rytkönen J, Raula J, Almeida S, Närvänen A, Salonen JJ, Lecommandoux S, Hirvonen JT, Santos HA. Functionalization of alkyne-terminated thermally hydrocarbonized porous silicon nanoparticles with targeting peptides and antifouling polymers: effect on the human plasma protein adsorption. ACS APPLIED MATERIALS & INTERFACES 2015; 7:2006-2015. [PMID: 25539741 DOI: 10.1021/am507827n] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Porous silicon (PSi) nanomaterials combine a high drug loading capacity and tunable surface chemistry with various surface modifications to meet the requirements for biomedical applications. In this work, alkyne-terminated thermally hydrocarbonized porous silicon (THCPSi) nanoparticles were fabricated and postmodified using five bioactive molecules (targeting peptides and antifouling polymers) via a single-step click chemistry to modulate the bioactivity of the THCPSi nanoparticles, such as enhancing the cellular uptake and reducing the plasma protein association. The size of the nanoparticles after modification was increased from 176 to 180-220 nm. Dextran 40 kDa modified THCPSi nanoparticles showed the highest stability in aqueous buffer. Both peptide- and polymer-functionalized THCPSi nanoparticles showed an extensive cellular uptake which was dependent on the functionalized moieties presented on the surface of the nanoparticles. The plasma protein adsorption study showed that the surface modification with different peptides or polymers induced different protein association profiles. Dextran 40 kDa functionalized THCPSi nanoparticles presented the least protein association. Overall, these results demonstrate that the "click" conjugation of the biomolecules onto the alkyne-terminated THCPSi nanoparticles is a versatile and simple approach to modulate the surface chemistry, which has high potential for biomedical applications.
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Affiliation(s)
- Chang-Fang Wang
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki , FI-00014 Helsinki, Finland
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14
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Li C, Cai B, Jin J, Liu J, Xu X, Yin J, Yin L. Hemocompatible, antioxidative and antibacterial polypropylene prepared by attaching silver nanoparticles capped with TPGS. J Mater Chem B 2015; 3:8410-8420. [DOI: 10.1039/c5tb01554e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of Ag NPs by TPGS and the excellent hemocompatibility, anti-oxidative and antibacterial properties of the deposition of Ag NPs onto PP grafted with NIPAAm and APMA.
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Affiliation(s)
- Chunming Li
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Bing Cai
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Jing Jin
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Jingchuan Liu
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Xiaodong Xu
- Polymer Materials Research Center
- College of Materials Science and Chemical Engineering
- Harbin Engineering University
- Harbin 150001
- P. R. China
| | - Jinghua Yin
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Ligang Yin
- Wego Holding Company Limited
- Weihai 264200
- P. R. China
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15
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Lin W, Junjian C, Chengzhi C, Lin S, Sa L, Li R, Yingjun W. Multi-biofunctionalization of a titanium surface with a mixture of peptides to achieve excellent antimicrobial activity and biocompatibility. J Mater Chem B 2015; 3:30-33. [DOI: 10.1039/c4tb01318b] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A model for multi-biofunctionalizing a titanium surface with a mixture of peptides at desired ratios to achieve excellent antimicrobial activity and biocompatibility.
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Affiliation(s)
- Wang Lin
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006
- China
- School of Materials Science and Engineering
| | - Chen Junjian
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006
- China
- School of Materials Science and Engineering
| | - Cai Chengzhi
- Department of Chemistry
- University of Houston
- Houston
- USA
| | - Shi Lin
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006
- China
- School of Materials Science and Engineering
| | - Liu Sa
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006
- China
- School of Materials Science and Engineering
| | - Ren Li
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006
- China
- School of Materials Science and Engineering
| | - Wang Yingjun
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006
- China
- School of Materials Science and Engineering
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16
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17
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Wang L, Chen J, Shi L, Shi Z, Ren L, Wang Y. The promotion of antimicrobial activity on silicon substrates using a "click" immobilized short peptide. Chem Commun (Camb) 2014; 50:975-7. [PMID: 24301818 DOI: 10.1039/c3cc47922f] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrated, for the first time, that the short antimicrobial peptide Tet213 could be conjugated onto the silicon surface by Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC). The modified surface exhibited excellent antimicrobial activity against S. aureus and E. coli, and low cytotoxicity to rat bone mesenchymal stem cells (rBMSCs).
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Affiliation(s)
- Lin Wang
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou 510006, China.
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18
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Serrano-Ruiz D, Alonso-Cristobal P, Mendez-Gonzalez D, Laurenti M, Olivero-David R, López-Cabarcos E, Rubio-Retama J. Nanosegregated polymeric domains on the surface of Fe3O4@SiO2particles. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/pola.27338] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- David Serrano-Ruiz
- Department of Physical-Chemistry II; Faculty of Pharmacy, Complutense University of Madrid; 28040 Spain
| | - Paulino Alonso-Cristobal
- Department of Physical-Chemistry II; Faculty of Pharmacy, Complutense University of Madrid; 28040 Spain
| | - Diego Mendez-Gonzalez
- Department of Physical-Chemistry II; Faculty of Pharmacy, Complutense University of Madrid; 28040 Spain
| | - Marco Laurenti
- Faculty of Dentistry, McGill University; Montreal Canada
| | - Raúl Olivero-David
- Department of Physical-Chemistry II; Faculty of Pharmacy, Complutense University of Madrid; 28040 Spain
| | - Enrique López-Cabarcos
- Department of Physical-Chemistry II; Faculty of Pharmacy, Complutense University of Madrid; 28040 Spain
| | - Jorge Rubio-Retama
- Department of Physical-Chemistry II; Faculty of Pharmacy, Complutense University of Madrid; 28040 Spain
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19
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Hadjesfandiari N, Yu K, Mei Y, Kizhakkedathu JN. Polymer brush-based approaches for the development of infection-resistant surfaces. J Mater Chem B 2014; 2:4968-4978. [DOI: 10.1039/c4tb00550c] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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20
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Chen J, Wang L, Shi L, Ren L, Wang Y. Local co-delivery and release of antimicrobial peptide and RGD using porous TiO2. RSC Adv 2014. [DOI: 10.1039/c4ra01983k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The co-delivery system with AMP and RGD on porous titanium showed excellent biocompatibility and antimicrobial activity.
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Affiliation(s)
- Junjian Chen
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006, China
- School of Materials Science and Engineering
- South China University of Technology
| | - Lin Wang
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006, China
- School of Materials Science and Engineering
- South China University of Technology
| | - Lin Shi
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006, China
- School of Materials Science and Engineering
- South China University of Technology
| | - Li Ren
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006, China
- School of Materials Science and Engineering
- South China University of Technology
| | - Yingjun Wang
- National Engineering Research Center for Tissue Restoration and Reconstruction
- South China University of Technology
- Guangzhou 510006, China
- School of Materials Science and Engineering
- South China University of Technology
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21
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Santos CM, Kumar A, Kolar SS, Contreras-Caceres R, McDermott A, Cai C. Immobilization of antimicrobial peptide IG-25 onto fluoropolymers via fluorous interactions and click chemistry. ACS APPLIED MATERIALS & INTERFACES 2013; 5:12789-93. [PMID: 24266746 PMCID: PMC3925349 DOI: 10.1021/am404591n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We report a practical method for biofunctionalization of fluoropolymers based on noncovalent, fluorous interactions and click chemistry that allows incorporation of biomolecules under physiological solutions. We demonstrate the method by immobilization of an antimicrobial peptide (AMP) on fluorous thin films and fluorosilicone contact lens. The fluorous surfaces were dip-coated with fluorous-tagged oligo(ethylene) chain terminated with a reactive group, such as an alkynyl group. This simple step generates a "clickable" surface. The noncovalent fluorous interaction was strong enough to allow subsequent covalent attachment of IG-25, a truncated version of the most extensively studied human AMP LL-37. The attachment was through copper-catalyzed click reaction between the alkynyl group on the surface and the azido-OEG tag at the N-terminus of IG-25. In comparison to surfaces presenting IG-25 randomly bound via carbodiimide chemistry, the surfaces presenting IG-25 tethering to the surface at the N-terminus via click chemistry displayed higher antibacterial activities against an ocular pathogen Pseudomonas aeruginosa (strain PA-O1).
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Affiliation(s)
| | - Amit Kumar
- Department of Chemistry, University of Houston, Houston, Texas 77204, USA
| | - Satya S. Kolar
- College of Optometry, University of Houston, Houston, Texas 77204, USA
| | | | - Alison McDermott
- College of Optometry, University of Houston, Houston, Texas 77204, USA
| | - Chengzhi Cai
- Department of Chemistry, University of Houston, Houston, Texas 77204, USA
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22
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Ho KKK, Chen R, Willcox MDP, Rice SA, Cole N, Iskander G, Kumar N. Quorum sensing inhibitory activities of surface immobilized antibacterial dihydropyrrolones via click chemistry. Biomaterials 2013; 35:2336-45. [PMID: 24345737 DOI: 10.1016/j.biomaterials.2013.11.072] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 11/22/2013] [Indexed: 11/17/2022]
Abstract
Device-related infection remains a major barrier to the use of biomaterial implants as life-saving devices. This study aims to examine the effectiveness and mechanism of action of surface attached dihydropyrrolones (DHPs), a quorum sensing (QS) inhibitor, against bacterial colonization. DHPs were covalently attached on glass surfaces via copper-catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC) click reaction. The covalent attachment of DHP surfaces was confirmed by X-ray photoelectron spectroscopy (XPS) and contact angle measurements, and the antimicrobial efficacy of the DHP coatings was assessed by confocal laser scanning microscopy (CLSM) and image analysis. The results demonstrated that covalently bound DHP compounds are effective in reducing the adhesion by up to 97% (p < 0.05) for both Pseudomonas aeruginosa and Staphylococcus aureus. Furthermore, using the green fluorescent protein (Gfp)-based reporter technology, it is demonstrated that surface attached DHPs were able to repress the expression of a lasB-gfp reporter fusion of P. aeruginosa by 72% (p < 0.001) without affecting cell viability. This demonstrates the ability of the covalently bound QS inhibitor to inhibit QS and suggests the existence of a membrane-based pathway(s) for QS inhibition. Hence, strategies based on incorporation of QS inhibitors such as DHPs represent a potential approach for prevention of device-related infections.
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Affiliation(s)
- Kitty K K Ho
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Renxun Chen
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Mark D P Willcox
- School of Optometry and Vision Science, University of New South Wales, Sydney, NSW 2052, Australia
| | - Scott A Rice
- School of Biotechnology and Biomolecular Sciences and The Centre for Marine Bio-Innovation, University of New South Wales, Sydney, NSW 2052, Australia; The Singapore Centre on Environmental Life Sciences Engineering, School of Biological Sciences, Nanyang Technological University, Singapore
| | - Nerida Cole
- School of Optometry and Vision Science, University of New South Wales, Sydney, NSW 2052, Australia
| | - George Iskander
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Naresh Kumar
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
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23
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Griffith GL, Russell RA, Kasus-Jacobi A, Thavathiru E, Gonzalez ML, Logan S, Pereira HA. CAP37 activation of PKC promotes human corneal epithelial cell chemotaxis. Invest Ophthalmol Vis Sci 2013; 54:6712-23. [PMID: 24008408 DOI: 10.1167/iovs.13-12054] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE The objective of this study was to elucidate the signaling pathway through which cationic antimicrobial protein of 37 kDa (CAP37) mediates human corneal epithelial cell (HCEC) chemotaxis. METHODS Immortalized HCECs were treated with pertussis toxin (10 and 1000 ng/mL), protein kinase C (PKC) inhibitors (calphostin c, 50 nM and Ro-31-8220, 100 nM), phorbol esters (phorbol 12,13-dibutyrate, 200 nM and phorbol 12-myristate 13-acetate, 1 μM) known to deplete PKC isoforms, and siRNAs (400 nM) before a modified Boyden chamber assay was used to determine the effect of these inhibitors and siRNAs on CAP37-directed HCEC migration. PKCδ protein levels, PKCδ-Thr(505) phosphorylation, and PKCδ kinase activity was assessed in CAP37-treated HCECs using immunohistochemistry, Western blotting, and a kinase activity assay, respectively. RESULTS Chemotaxis studies revealed that treatment with pertussis toxin, PKC inhibitors, phorbol esters, and siRNAs significantly inhibited CAP37-mediated chemotaxis compared with untreated controls. CAP37 treatment increased PKCδ protein levels and led to PKCδ phosphorylation on residue Thr(505). Direct activation of PKCδ by CAP37 was demonstrated using a kinase activity assay. CONCLUSIONS These findings lead us to conclude that CAP37 is an important regulator of corneal epithelial cell migration and mediates its effects through PKCδ.
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Affiliation(s)
- Gina L Griffith
- Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
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24
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Bakhshi H, Yeganeh H, Mehdipour-Ataei S, Solouk A, Irani S. Polyurethane Coatings Derived from 1,2,3-Triazole-Functionalized Soybean Oil-Based Polyols: Studying their Physical, Mechanical, Thermal, and Biological Properties. Macromolecules 2013. [DOI: 10.1021/ma401554c] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Hadi Bakhshi
- Polyurethane
Department, Iran Polymer and Petrochemical Institute, P.O. Box: 14965-115, Tehran, Iran
| | - Hamid Yeganeh
- Polyurethane
Department, Iran Polymer and Petrochemical Institute, P.O. Box: 14965-115, Tehran, Iran
| | - Shahram Mehdipour-Ataei
- Polyurethane
Department, Iran Polymer and Petrochemical Institute, P.O. Box: 14965-115, Tehran, Iran
| | - Atefeh Solouk
- Biomedical
Engineering Faculty, Amirkabir University of Technology, Tehran, Iran
| | - Shiva Irani
- Biology
Department, Science and Research Branch, Islamic Azad University, Tehran, Iran
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25
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Ciampi S, James M, Choudhury MH, Darwish NA, Gooding JJ. The detailed characterization of electrochemically switchable molecular assemblies on silicon electrodes. Phys Chem Chem Phys 2013; 15:9879-90. [DOI: 10.1039/c3cp50355k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Li Y, Zuilhof H. Photochemical grafting and patterning of organic monolayers on indium tin oxide substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:5350-5359. [PMID: 22324432 DOI: 10.1021/la204980f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Covalently attached organic layers on indium tin oxide (ITO) surfaces were prepared by the photochemical grafting with 1-alkenes. The surface modification was monitored with static water contact angle, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) measurements. Hydrophobic methyl-terminated ITO surfaces can be obtained via the grafting of tetradec-1-ene, whereas the attachment of ω-functionalized 1-alkenes leads to functionalized ITO surfaces. The use of a C≡C-Ge(CH(3))(3) terminus allows for facile tagging of the surface with an azido group via a one-pot deprotection/click reaction, resulting in bio/electronically active interfaces. The combination of nonaggressive chemicals (alkenes), mild reaction conditions (room temperature), and a light-induced grafting that facilitates the direct patterning of organic layers makes this simple approach highly promising for the development of ITO-based (bio)electronic devices.
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Affiliation(s)
- Yan Li
- Laboratory of Organic Chemistry, Wageningen University, Dreijenplein 8, 6703 HB Wageningen, The Netherlands
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27
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Rambarran T, Gonzaga F, Brook MA. Generic, Metal-Free Cross-Linking and Modification of Silicone Elastomers Using Click Ligation. Macromolecules 2012. [DOI: 10.1021/ma202785x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Talena Rambarran
- Department of Chemistry and Chemical
Biology, McMaster University, 1280 Main
Street West, Hamilton,
Ontario, Canada L8S 4M1
| | - Ferdinand Gonzaga
- Department of Chemistry and Chemical
Biology, McMaster University, 1280 Main
Street West, Hamilton,
Ontario, Canada L8S 4M1
| | - Michael A. Brook
- Department of Chemistry and Chemical
Biology, McMaster University, 1280 Main
Street West, Hamilton,
Ontario, Canada L8S 4M1
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28
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Ciampi S, James M, Le Saux G, Gaus K, Justin Gooding J. Electrochemical “Switching” of Si(100) Modular Assemblies. J Am Chem Soc 2011; 134:844-7. [DOI: 10.1021/ja210048x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Simone Ciampi
- School of Chemistry, The University of New South Wales, Sydney, NSW 2052,
Australia
| | - Michael James
- School of Chemistry, The University of New South Wales, Sydney, NSW 2052,
Australia
- Bragg Institute, Australian Nuclear Science and Technology Organisation (ANSTO), Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - Guillaume Le Saux
- School of Chemistry, The University of New South Wales, Sydney, NSW 2052,
Australia
| | - Katharina Gaus
- Centre for Vascular Research, The University of New South Wales, Sydney, NSW 2052,
Australia
| | - J. Justin Gooding
- School of Chemistry, The University of New South Wales, Sydney, NSW 2052,
Australia
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29
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James M, Ciampi S, Darwish TA, Hanley TL, Sylvester SO, Gooding JJ. Nanoscale water condensation on click-functionalized self-assembled monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:10753-10762. [PMID: 21780835 DOI: 10.1021/la202359c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have examined the nanoscale adsorption of molecular water under ambient conditions onto a series of well-characterized functionalized surfaces produced by Cu(I)-catalyzed alkyne-azide cycloaddition (CuAAC or "click") reactions on alkyne-terminated self-assembled monolayers on silicon. Water contact angle (CA) measurements reveal a range of macroscopic hydrophilicity that does not correlate with the tendency of these surfaces to adsorb water at the molecular level. X-ray reflectometry has been used to follow the kinetics of water adsorption on these "click"-functionalized surfaces, and also shows that dense continuous molecular water layers are formed over 30 h. For example, a highly hydrophilic surface, functionalized by an oligo(ethylene glycol) moiety (with a CA = 34°) showed 2.9 Å of adsorbed water after 30 h, while the almost hydrophobic underlying alkyne-terminated monolayer (CA = 84°) showed 5.6 Å of adsorbed water over the same period. While this study highlights the capacity of X-ray reflectometry to study the structure of adsorbed water on these surfaces, it should also serve as a warning for those intending to characterize self-assembled monolayers and functionalized surfaces to avoid contamination by even trace amounts of water vapor. Moreover, contact angle measurements alone cannot be relied upon to predict the likely degree of moisture uptake on such surfaces.
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Affiliation(s)
- Michael James
- Australian Nuclear Science and Technology Organisation (ANSTO), Locked Bag 2001, Kirrawee DC NSW 2232, Australia.
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30
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Li Y, Cai C. Click chemistry-based functionalization on non-oxidized silicon substrates. Chem Asian J 2011; 6:2592-605. [PMID: 21751406 DOI: 10.1002/asia.201100294] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Indexed: 11/07/2022]
Abstract
Copper-catalyzed azide-alkyne cycloaddition (CuAAC), combined with the chemical stability of the Si-C-bound organic layer, serves as an efficient tool for the modification of silicon substrates, particularly for the immobilization of complex biomolecules. This review covers recent advances in the preparation of alkynyl- or azido-terminated "clickable" platforms on non-oxidized silicon and their further derivatization by means of the CuAAC reaction. The exploitation of these "click"-functionalized organic thin films as model surfaces to study many biological events was also addressed, as they are directly relevant to the on-going effort of creating silicon-based molecular electronics and chemical/biomolecular sensors.
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Affiliation(s)
- Yan Li
- Department of Chemistry & Center for Materials Chemistry, University of Houston, Houston, Texas 77204, USA
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31
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Jenny NM, Mayor M, Eaton TR. Phenyl–Acetylene Bond Assembly: A Powerful Tool for the Construction of Nanoscale Architectures. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100176] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Nicolas M. Jenny
- Department of Chemistry, University of Basel St. Johanns‐Ring 19, 4056 Basel, Switzerland, Fax: +41‐61‐267‐1016
| | - Marcel Mayor
- Department of Chemistry, University of Basel St. Johanns‐Ring 19, 4056 Basel, Switzerland, Fax: +41‐61‐267‐1016
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, P. O. Box 3640, 76021 Karlsruhe, Germany
| | - Thomas R. Eaton
- Department of Chemistry, University of Basel St. Johanns‐Ring 19, 4056 Basel, Switzerland, Fax: +41‐61‐267‐1016
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