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Pham DA, Wang CS, Séguy L, Zhang H, Benbabaali S, Faivre J, Sim S, Xie G, Olszewski M, Rabanel JM, Moldovan F, Matyjaszewski K, Banquy X. Bioinspired Bottlebrush Polymers Effectively Alleviate Frictional Damage Both In Vitro and In Vivo. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2401689. [PMID: 38552182 DOI: 10.1002/adma.202401689] [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: 02/01/2024] [Revised: 03/25/2024] [Indexed: 04/09/2024]
Abstract
Bottlebrush polymers (BB) have emerged as compelling candidates for biosystems to face tribological challenges, including friction and wear. This study provides a comprehensive assessment of an engineered triblock BB polymer's affinity, cell toxicity, lubrication, and wear protection in both in vitro and in vivo settings, focusing on applications for conditions like osteoarthritis and dry eye syndrome. Results show that the designed polymer rapidly adheres to various surfaces (e.g., cartilage, eye, and contact lens), forming a robust, biocompatible layer for surface lubrication and protection. The tribological performance and biocompatibility are further enhanced in the presence of hyaluronic acid (HA) both in vitro and in vivo. The exceptional lubrication performance and favorable interaction with HA position the synthesized triblock polymer as a promising candidate for innovative treatments addressing deficiencies in bio-lubricant systems.
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Affiliation(s)
- Duy Anh Pham
- Faculty of Pharmacy, University of Montreal, Montréal, Québec, H3T 1J4, Canada
| | - Chang-Sheng Wang
- Faculty of Pharmacy, University of Montreal, Montréal, Québec, H3T 1J4, Canada
| | - Line Séguy
- Faculty of Pharmacy, University of Montreal, Montréal, Québec, H3T 1J4, Canada
- Research Center of CHU Sainte-Justine, University of Montreal, Montréal, QC, H3T 1C5, Canada
| | - Hu Zhang
- Faculty of Pharmacy, University of Montreal, Montréal, Québec, H3T 1J4, Canada
| | - Sabrina Benbabaali
- Faculté des Sciences et Ingénierie, Sorbonne University, Paris, 75005, France
| | - Jimmy Faivre
- Faculty of Pharmacy, University of Montreal, Montréal, Québec, H3T 1J4, Canada
| | - Sotcheadt Sim
- Biomomentum Inc, 1980 rue Michelin, Laval, Québec, H7L 5C2, Canada
| | - Guojun Xie
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
| | - Mateusz Olszewski
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
| | - Jean-Michel Rabanel
- Faculty of Pharmacy, University of Montreal, Montréal, Québec, H3T 1J4, Canada
| | - Florina Moldovan
- Research Center of CHU Sainte-Justine, University of Montreal, Montréal, QC, H3T 1C5, Canada
| | | | - Xavier Banquy
- Faculty of Pharmacy, University of Montreal, Montréal, Québec, H3T 1J4, Canada
- Institute of Biomedical Engineering, Faculty of Medicine, University of Montreal, Montréal, QC, H3C 3J7, Canada
- Department of Chemistry, Faculty of Arts and Science, University of Montreal, Montréal, QC, H3C 3J7, Canada
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2
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Stellwagen A, MacGregor C, Kung R, Konstantopoulos A, Hossain P. Personal hygiene risk factors for contact lens-related microbial keratitis. BMJ Open Ophthalmol 2020; 5:e000476. [PMID: 32953996 PMCID: PMC7481083 DOI: 10.1136/bmjophth-2020-000476] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 08/04/2020] [Accepted: 08/15/2020] [Indexed: 11/28/2022] Open
Abstract
Objective Microbial keratitis is a sight-threatening complication of contact lens wear, which affects thousands of patients and causes a significant burden on healthcare services. This study aims to identify compliance with contact lens care recommendations and identify personal hygiene risk factors in patients who develop contact lens-related microbial keratitis. Methods and analysis A case–control study was conducted at the University Hospital Southampton Eye Casualty from October to December 2015. Two participant groups were recruited: cases were contact lens wearers presenting with microbial keratitis and controls were contact lens wearers without infection. Participants underwent face-to-face interviews to identify lens wear practices, including lens type, hours of wear, personal hygiene and sleeping and showering in lenses. Univariate and multivariate regression models were used to compare groups. Results 37 cases and 41 controls were identified. Showering in contact lenses was identified as the greatest risk factor (OR, 3.1; 95% CI, 1.2 to 8.5; p=0.03), with showering daily in lenses compared with never, increasing the risk of microbial keratitis by over seven times (OR, 7.1; 95% CI, 2.1 to 24.6; p=0.002). Other risks included sleeping in lenses (OR, 3.1; 95% CI, 1.1 to 8.6; p=0.026), and being aged 25–39 (OR, 6.38; 95% CI, 1.56 to 26.10; p=0.010) and 40–54 (OR, 4.00; 95% CI 0.96 to 16.61; p=0.056). Conclusion The greatest personal hygiene risk factor for contact lens-related microbial keratitis was showering while wearing lenses, with an OR of 3.1, which increased to 7.1 if patients showered daily in lenses. The OR for sleeping in lenses was 3.1, and the most at-risk age group was 25–54.
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Affiliation(s)
- Anna Stellwagen
- Eye Unit, University Hospital Southampton NHS Foundation Trust, Southampton, UK.,Eye Unit, Clinical and Experimental Sciences, University of Southampton, Southampton, UK
| | - Cheryl MacGregor
- Eye Unit, University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Roger Kung
- Eye Unit, University Hospital Southampton NHS Foundation Trust, Southampton, UK.,Eye Unit, Clinical and Experimental Sciences, University of Southampton, Southampton, UK
| | | | - Parwez Hossain
- Eye Unit, University Hospital Southampton NHS Foundation Trust, Southampton, UK.,Eye Unit, Clinical and Experimental Sciences, University of Southampton, Southampton, UK
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3
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Moreddu R, Vigolo D, Yetisen AK. Contact Lens Technology: From Fundamentals to Applications. Adv Healthc Mater 2019; 8:e1900368. [PMID: 31183972 DOI: 10.1002/adhm.201900368] [Citation(s) in RCA: 109] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 05/20/2019] [Indexed: 12/29/2022]
Abstract
Contact lenses are ocular prosthetic devices used by over 150 million people worldwide. Primary applications of contact lenses include vision correction, therapeutics, and cosmetics. Contact lens materials have significantly evolved over time to minimize adverse effects associated with contact lens wearing, to maintain a regular corneal metabolism, and to preserve tear film stability. This article encompasses contact lens technology, including materials, chemical and physical properties, manufacturing processes, microbial contamination, and ocular complications. The function and the composition of the tear fluid are discussed to assess its potential as a diagnostic media. The regulatory standards of contact lens devices with regard to biocompatibility and contact lens market are presented. Future prospects in contact lens technology are evaluated, with particular interest given to theranostic applications for in situ continuous monitoring the ocular physiology.
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Affiliation(s)
- Rosalia Moreddu
- Department of Chemical EngineeringImperial College London SW7 2AZ London UK
- School of Chemical EngineeringUniversity of Birmingham B15 2TT Birmingham UK
| | - Daniele Vigolo
- School of Chemical EngineeringUniversity of Birmingham B15 2TT Birmingham UK
| | - Ali K. Yetisen
- Department of Chemical EngineeringImperial College London SW7 2AZ London UK
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4
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Shirai T, Yamamoto Y. Asymmetric Hydroarylation of Unsaturated Bond via C-H Functionalization by Cationic Iridium/Bisphosphoramidite Catalyst. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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5
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Desroches J, Tremblay A, Paquin JF. Racemic and enantioselective metal-catalyzed synthesis of SF 5-containing diarylmethanols. Org Biomol Chem 2018; 14:8764-8780. [PMID: 27714227 DOI: 10.1039/c6ob01663d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The racemic and enantioselective metal-catalyzed addition of arylboronic acids to 4- and 3-(pentafluorosulfur)benzaldehydes is reported. The racemic synthesis was accomplished using a Pd-based system and a wide range of arylboronic acids could be used, resulting in yields of 42 to 98% of the corresponding SF5-containing diarylmethanols. A ruthenium-based system, along with (R,R)-Me-BIPAM as the chiral ligand, was investigated and optimized for the enantioselective version. In this case, while the chiral SF5-containing diarylmethanols were generally obtained in good yields (up to 94%) and enantioselectivities (up to 98% ee), limitations were also observed. For instance, 4-(pentafluorosulfur)benzaldehyde generally provided slightly better yields than 3-(pentafluorosulfur)benzaldehyde. In addition, lower yields and enantioselectivities were observed when using either 4- and 3-substituted arylboronic acids bearing electron-withdrawing (e.g., CO2Et, NO2, CF3) or 2-substituted arylboronic acids (regardless of the nature of the substituent). Overall, the SF5-containing diarylmethanols described herein represent novel and potentially useful fluorinated building blocks for the synthesis of biologically active compounds.
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Affiliation(s)
- Justine Desroches
- CCVC, PROTEO, Département de chimie, 1045 avenue de la Médecine, Université Laval, Québec, Québec, CanadaG1V 0A6.
| | - Ariane Tremblay
- CCVC, PROTEO, Département de chimie, 1045 avenue de la Médecine, Université Laval, Québec, Québec, CanadaG1V 0A6.
| | - Jean-François Paquin
- CCVC, PROTEO, Département de chimie, 1045 avenue de la Médecine, Université Laval, Québec, Québec, CanadaG1V 0A6.
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6
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Casciaro B, Dutta D, Loffredo MR, Marcheggiani S, McDermott AM, Willcox MD, Mangoni ML. Esculentin-1a derived peptides kill Pseudomonas aeruginosa biofilm on soft contact lenses and retain antibacterial activity upon immobilization to the lens surface. Biopolymers 2017; 110. [PMID: 29086910 DOI: 10.1002/bip.23074] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 09/14/2017] [Accepted: 10/04/2017] [Indexed: 12/18/2022]
Abstract
Contact lens (CL) wear is a risk factor for development of microbial keratitis, a vision threatening infection of the eye. Adverse events associated with colonization of lenses, especially by the multi-drug resistant and biofilm forming bacterium Pseudomonas aeruginosa remain a major safety issue. Therefore, novel strategies and compounds to reduce the onset of CL-associated ocular infections are needed. Recently, the activity of the frog skin-derived antimicrobial peptide Esc(1-21) and its diastereomer Esc(1-21)-1c was evaluated against both planktonic and sessile forms of this pathogen. Furthermore, Esc(1-21) was found to significantly reduce the severity of P. aeruginosa keratitis in a mouse model and preserve antipseudomonal activity in the presence of human basal tears. Here, we have analyzed the activity of the peptides on P. aeruginosa biofilm formed on soft CLs. Microbiological assays and scanning electron microscopy analysis indicated that the peptides were able to disrupt the bacterial biofilm, with the diastereomer having the greater efficacy (up to 85% killing vs no killing at 4 μM for some strains). Furthermore, upon covalent immobilization to the CL, the two peptides were found to cause more than four log reduction in the number of bacterial cells within 20 minutes and to reduce bacterial adhesion to the CL surface (77%-97% reduction) in 24 hours. Importantly, peptide immobilization was not toxic to mammalian cells and did not affect the lens characteristics. Overall, our data suggest that both peptides have great potential to be developed as novel pharmaceuticals for prevention and treatment of CL-associated P. aeruginosa keratitis.
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Affiliation(s)
- Bruno Casciaro
- Laboratory affiliated to Pasteur Italia-Fondazione Cenci Bolognetti, Department of Biochemical Sciences, Sapienza University of Rome, Rome, Italy
| | - Debarun Dutta
- School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
| | - Maria Rosa Loffredo
- Laboratory affiliated to Pasteur Italia-Fondazione Cenci Bolognetti, Department of Biochemical Sciences, Sapienza University of Rome, Rome, Italy
| | | | - Alison M McDermott
- Department of Applied Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom
| | - Mark Dp Willcox
- School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
| | - Maria Luisa Mangoni
- Laboratory affiliated to Pasteur Italia-Fondazione Cenci Bolognetti, Department of Biochemical Sciences, Sapienza University of Rome, Rome, Italy
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7
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Land AD, Penno KL, Brzezinski JL. Identification of Microorganisms Isolated From Counterfeit and Unapproved Decorative Contact Lenses. J Forensic Sci 2017; 63:635-639. [PMID: 28542816 DOI: 10.1111/1556-4029.13553] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 04/18/2017] [Accepted: 04/19/2017] [Indexed: 12/29/2022]
Abstract
All contact lenses (corrective/noncorrective) are considered Class II or Class III medical devices under the Federal Food, Drug, and Cosmetic Act, which also states that contact lenses can only be obtained with a prescription. The Forensic Chemistry Center of the US Food & Drug Administration has examined over 300 decorative, noncorrective contact lenses obtained without a prescription. Our observations indicate that 60% of the counterfeit lenses and 27% of the unapproved lenses examined were positive for microbial contamination. Twenty-nine different brands of noncorrective contact lenses were examined, and 48% of them had at least one sample positive for microbial contamination. Each microorganism was further identified using DNA sequencing. Contaminated contact lenses are associated with numerous health risks, including ocular infections and conjunctivitis leading to permanent visual impairment or blindness. These results support the contention that acquiring contact lenses without a prescription is a considerable threat to consumer health and safety.
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Affiliation(s)
- Adrian D Land
- Forensic Chemistry Center, United States Food and Drug Administration, 6751 Steger Drive, Cincinnati, OH, 45237
| | - Katie L Penno
- Forensic Chemistry Center, United States Food and Drug Administration, 6751 Steger Drive, Cincinnati, OH, 45237
| | - Jennifer L Brzezinski
- Forensic Chemistry Center, United States Food and Drug Administration, 6751 Steger Drive, Cincinnati, OH, 45237
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8
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Kato N, Shirai T, Yamamoto Y. Rhodium-Catalyzed Enantioselective Arylation of Aliphatic Imines. Chemistry 2016; 22:7739-42. [PMID: 27119262 DOI: 10.1002/chem.201601246] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Indexed: 12/18/2022]
Abstract
Chiral rhodium(I)-catalyzed highly enantioselective arylation of aliphatic N-sulfonyl aldimines with arylboronic acids has been developed. This transformation is achieved by the use of a rhodium/bis(phosphoramidite) catalyst to give enantiomerically enriched α-branched amines (up to 99 % ee). In addition, this system enables efficient synthesis of (+)-NPS R-568 and Cinacalcet which are calcimimetic agents.
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Affiliation(s)
- Naoya Kato
- Division of Chemical Process Engineering and Frontier Chemistry Center (FCC), Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8 Kita-ku, Sapporo, Hokkaido, 060-8628, Japan
| | - Tomohiko Shirai
- Division of Chemical Process Engineering and Frontier Chemistry Center (FCC), Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8 Kita-ku, Sapporo, Hokkaido, 060-8628, Japan
| | - Yasunori Yamamoto
- Division of Chemical Process Engineering and Frontier Chemistry Center (FCC), Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8 Kita-ku, Sapporo, Hokkaido, 060-8628, Japan.
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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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Morais DS, Fernandes S, Gomes PS, Fernandes MH, Sampaio P, Ferraz MP, Santos JD, Lopes MA, Sooraj Hussain N. Novel cerium doped glass-reinforced hydroxyapatite with antibacterial and osteoconductive properties for bone tissue regeneration. Biomed Mater 2015; 10:055008. [DOI: 10.1088/1748-6041/10/5/055008] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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11
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Kruh JN, Kruh-Garcia NA, Foster CS. Evaluation of the Effect ofN-Acetylcysteine on Protein Deposition on Contact Lenses in Patients with the Boston Keratoprosthesis Type I. J Ocul Pharmacol Ther 2015; 31:314-22. [DOI: 10.1089/jop.2015.0010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Jonathan N. Kruh
- Massachusetts Eye Research and Surgery Institution, Cambridge, Massachusetts
- Ocular Immunology and Uveitis Foundation, Cambridge, Massachusetts
| | - Nicole A. Kruh-Garcia
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado
| | - C. Stephen Foster
- Massachusetts Eye Research and Surgery Institution, Cambridge, Massachusetts
- Ocular Immunology and Uveitis Foundation, Cambridge, Massachusetts
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
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12
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Bispo PJM, Haas W, Gilmore MS. Biofilms in infections of the eye. Pathogens 2015; 4:111-36. [PMID: 25806622 PMCID: PMC4384075 DOI: 10.3390/pathogens4010111] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 03/12/2015] [Accepted: 03/13/2015] [Indexed: 12/27/2022] Open
Abstract
The ability to form biofilms in a variety of environments is a common trait of bacteria, and may represent one of the earliest defenses against predation. Biofilms are multicellular communities usually held together by a polymeric matrix, ranging from capsular material to cell lysate. In a structure that imposes diffusion limits, environmental microgradients arise to which individual bacteria adapt their physiologies, resulting in the gamut of physiological diversity. Additionally, the proximity of cells within the biofilm creates the opportunity for coordinated behaviors through cell–cell communication using diffusible signals, the most well documented being quorum sensing. Biofilms form on abiotic or biotic surfaces, and because of that are associated with a large proportion of human infections. Biofilm formation imposes a limitation on the uses and design of ocular devices, such as intraocular lenses, posterior contact lenses, scleral buckles, conjunctival plugs, lacrimal intubation devices and orbital implants. In the absence of abiotic materials, biofilms have been observed on the capsule, and in the corneal stroma. As the evidence for the involvement of microbial biofilms in many ocular infections has become compelling, developing new strategies to prevent their formation or to eradicate them at the site of infection, has become a priority.
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Affiliation(s)
- Paulo J M Bispo
- Departments of Ophthalmology, Microbiology and Immunology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, 02114 USA
| | - Wolfgang Haas
- Departments of Ophthalmology, Microbiology and Immunology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, 02114 USA
| | - Michael S Gilmore
- Departments of Ophthalmology, Microbiology and Immunology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, 02114 USA.
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13
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Yamamoto T, Yamakawa T. Ruthenium/base-catalyzed ortho-selective C–H arylation of acylarenes with halogenated arylboronates. RSC Adv 2015. [DOI: 10.1039/c5ra19810k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Ruthenium-catalyzed ortho-selective C–H arylation of acylarenes with halogenated arylboronates was promoted by the catalytic amount of bases and provided desired halogenated biaryls in excellent yields under 0.2–1 mol% ruthenium catalyst loading.
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Affiliation(s)
- Tetsuya Yamamoto
- Catalysis Group
- Sagami Chemical Research Institute
- Kanagawa 252-1193
- Japan
| | - Tetsu Yamakawa
- Catalysis Group
- Sagami Chemical Research Institute
- Kanagawa 252-1193
- Japan
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14
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Reilly SW, Box HK, Kuchenbeiser GR, Rubio RJ, Letko CS, Cousineau KD, Hollis TK. 1,4-Addition of aryl boronic acids to α,β-unsaturated ketones catalyzed by a CCC–NHC pincer rhodium complex. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.09.107] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Ji YW, Hong SH, Chung DY, Kim EK, Lee HK. Comparison of Surface Roughness and Bacterial Adhesion between Cosmetic Contact Lenses and Conventional Contact Lenses. JOURNAL OF THE KOREAN OPHTHALMOLOGICAL SOCIETY 2014. [DOI: 10.3341/jkos.2014.55.5.646] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Yong Woo Ji
- Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea
| | - Soon Ho Hong
- Division of Microbiology, Department of Laboratory Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Dong Yong Chung
- Morphology Lab., Yonsei Biomedical Research Institute, Seoul, Korea
| | - Eung Kweon Kim
- Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea
- Institute of Corneal Dystrophy Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea
| | - Hyung Keun Lee
- Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea
- Institute of Corneal Dystrophy Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea
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16
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A laboratory assessment of factors that affect bacterial adhesion to contact lenses. BIOLOGY 2013; 2:1268-81. [PMID: 24833224 PMCID: PMC4009790 DOI: 10.3390/biology2041268] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 10/01/2013] [Accepted: 10/29/2013] [Indexed: 11/17/2022]
Abstract
Adhesion of pathogenic microbes, particularly bacteria, to contact lenses is implicated in contact lens related microbial adverse events. Various in vitro conditions such as type of bacteria, the size of initial inoculum, contact lens material, nutritional content of media, and incubation period can influence bacterial adhesion to contact lenses and the current study investigated the effect of these conditions on bacterial adhesion to contact lenses. There was no significant difference in numbers of bacteria that adhered to hydrogel etafilcon A or silicone hydrogel senofilcon A contact lenses. Pseudomonas aeruginosa adhered in higher numbers compared to Staphylococcus aureus. Within a genera/species, adhesion of different bacterial strains did not differ appreciably. The size of initial inoculum, nutritional content of media, and incubation period played significant roles in bacterial adhesion to lenses. A set of in vitro assay conditions to help standardize adhesion between studies have been recommended.
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17
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Korenaga T, Ko A, Shimada K. Low-Temperature Rh-Catalyzed Asymmetric 1,4-Addition of Arylboronic Acids to α,β-Unsaturated Carbonyl Compounds. J Org Chem 2013; 78:9975-80. [DOI: 10.1021/jo4014707] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Toshinobu Korenaga
- Department of Chemistry and
Bioengineering, Faculty of Engineering, Iwate University, 4-3-5
Ueda, Morioka, Iwate 020-8551, Japan
| | - Aram Ko
- Department of Chemistry and
Bioengineering, Faculty of Engineering, Iwate University, 4-3-5
Ueda, Morioka, Iwate 020-8551, Japan
| | - Kazuaki Shimada
- Department of Chemistry and
Bioengineering, Faculty of Engineering, Iwate University, 4-3-5
Ueda, Morioka, Iwate 020-8551, Japan
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18
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Yadav MK, Chuck RS, Park CY. Composition of Artificial Tear Solution AffectsIn Vitro Pseudomonas aeruginosaBiofilm Formation on Silicone Hydrogel Lens. J Ocul Pharmacol Ther 2013; 29:591-4. [DOI: 10.1089/jop.2012.0078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Mukesh Kumar Yadav
- Department of Ophthalmology, Ilsan Hospital, Dongguk University, Koyang, Kyunggido, South Korea
| | - Roy S. Chuck
- Department of Ophthalmology and Visual Sciences, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, New York
| | - Choul Yong Park
- Department of Ophthalmology, Ilsan Hospital, Dongguk University, Koyang, Kyunggido, South Korea
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Li K, Hu N, Luo R, Yuan W, Tang W. A Chiral Ruthenium-Monophosphine Catalyst for Asymmetric Addition of Arylboronic Acids to Aryl Aldehydes. J Org Chem 2013; 78:6350-5. [DOI: 10.1021/jo400850m] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Ke Li
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu
610041, China
| | - Naifu Hu
- State Key
Laboratory of Bi-organic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai
200032, China
| | - Renshi Luo
- State Key
Laboratory of Bi-organic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai
200032, China
| | - Weicheng Yuan
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu
610041, China
| | - Wenjun Tang
- State Key
Laboratory of Bi-organic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai
200032, China
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Zhang L, Sonaglia L, Stacey J, Lautens M. Multicomponent Multicatalyst Reactions (MC)2R: One-Pot Synthesis of 3,4-Dihydroquinolinones. Org Lett 2013; 15:2128-31. [DOI: 10.1021/ol4006008] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lei Zhang
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St George Street, Toronto, Ontario M5S 3H6, Canada
| | - Lorenzo Sonaglia
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St George Street, Toronto, Ontario M5S 3H6, Canada
| | - Jason Stacey
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St George Street, Toronto, Ontario M5S 3H6, Canada
| | - Mark Lautens
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St George Street, Toronto, Ontario M5S 3H6, Canada
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21
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Ţălu Ş. Characterization of surface roughness of unworn hydrogel contact lenses at a nanometric scale using methods of modern metrology. POLYM ENG SCI 2013. [DOI: 10.1002/pen.23481] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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22
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Yamamoto Y. Asymmetric Addition Reactions of Organoboron Compounds Using Bidentate Phosphoramidite Ligand. J SYN ORG CHEM JPN 2013. [DOI: 10.5059/yukigoseikyokaishi.71.716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Yamamoto Y, Kurihara K, Takahashi Y, Miyaura N. An N-linked bidentate phosphoramidite ligand (N-Me-BIPAM) for rhodium-catalyzed asymmetric 1,4-addition of arylboronic acids to α,β-unsaturated ketones. Molecules 2012; 18:14-26. [PMID: 23344185 PMCID: PMC6269836 DOI: 10.3390/molecules18010014] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 12/14/2012] [Accepted: 12/17/2012] [Indexed: 11/16/2022] Open
Abstract
A new bidentate phosphoramidite (N-Me-BIPAM) based on Shibasaki's N-linked BINOL was synthesized. This ligand appears to be highly effective for rhodium-catalyzed asymmetric conjugated addition of arylboronic acids to α,β-unsaturated enones. The reaction of ortho-substituted arylboronic acid with acyclic and cyclic enones provides the corresponding products in good yields and enantioselectivities.
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Yamamoto Y, Shirai T, Watanabe M, Kurihara K, Miyaura N. Ru/Me-BIPAM-catalyzed asymmetric addition of arylboronic acids to aliphatic aldehydes and α-ketoesters. Molecules 2011; 16:5020-34. [PMID: 21694668 PMCID: PMC6264355 DOI: 10.3390/molecules16065020] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Revised: 06/13/2011] [Accepted: 06/15/2011] [Indexed: 11/16/2022] Open
Abstract
A ruthenium-catalyzed asymmetric arylation of aliphatic aldehydes and α-ketoesters with arylboronic acids has been developed, giving chiral alkyl(aryl)methanols and α-hydroxy esters in good yields. The use of a chiral bidentate phosphoramidite ligand (Me-BIPAM) achieved excellent enantioselectivities.
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Affiliation(s)
- Yasunori Yamamoto
- Division of Chemical Process Engineering, Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8 Kita-ku, Sapporo, Japan.
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