1
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Zhu S, Alexander MK, Paiva TO, Rachwalski K, Miu A, Xu Y, Verma V, Reichelt M, Dufrêne YF, Brown ED, Cox G. The inactivation of tolC sensitizes Escherichia coli to perturbations in lipopolysaccharide transport. iScience 2024; 27:109592. [PMID: 38628966 PMCID: PMC11019271 DOI: 10.1016/j.isci.2024.109592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 02/02/2024] [Accepted: 03/25/2024] [Indexed: 04/19/2024] Open
Abstract
The Escherichia coli outer membrane channel TolC complexes with several inner membrane efflux pumps to export compounds across the cell envelope. All components of these complexes are essential for robust efflux activity, yet E. coli is more sensitive to antimicrobial compounds when tolC is inactivated compared to the inactivation of genes encoding the inner membrane drug efflux pumps. While investigating these susceptibility differences, we identified a distinct class of inhibitors targeting the core-lipopolysaccharide translocase, MsbA. We show that tolC null mutants are sensitized to structurally unrelated MsbA inhibitors and msbA knockdown, highlighting a synthetic-sick interaction. Phenotypic profiling revealed that tolC inactivation induced cell envelope softening and increased outer membrane permeability. Overall, this work identified a chemical probe of MsbA, revealed that tolC is associated with cell envelope mechanics and integrity, and highlighted that these findings should be considered when using tolC null mutants to study efflux deficiency.
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Affiliation(s)
- Shawna Zhu
- College of Biological Sciences, Department of Molecular and Cellular Biology, University of Guelph, 50 Stone Road E, Guelph, ON N1G 2W1, Canada
| | | | - Telmo O. Paiva
- Institute of Life Sciences, UCLouvain, Croix du Sud, 4-5, bte L7.07.06, B-1348 Louvain-la-Neuve, Belgium
| | - Kenneth Rachwalski
- Biochemistry and Biomedical Sciences and Degroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - Anh Miu
- Genentech Inc, Biochemical and Cellular Pharmacology, South San Francisco, CA, USA
| | - Yiming Xu
- Genentech Inc, Infectious Diseases, South San Francisco, CA, USA
| | - Vishal Verma
- Genentech Inc, Discovery Chemistry, South San Francisco, CA, USA
| | - Mike Reichelt
- Genentech Inc, Pathology, South San Francisco, CA, USA
| | - Yves F. Dufrêne
- Institute of Life Sciences, UCLouvain, Croix du Sud, 4-5, bte L7.07.06, B-1348 Louvain-la-Neuve, Belgium
| | - Eric D. Brown
- Biochemistry and Biomedical Sciences and Degroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - Georgina Cox
- College of Biological Sciences, Department of Molecular and Cellular Biology, University of Guelph, 50 Stone Road E, Guelph, ON N1G 2W1, Canada
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2
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French S, Guo ABY, Ellis MJ, Deisinger JP, Johnson JW, Rachwalski K, Piquette ZA, Lluka T, Zary M, Gamage S, Magolan J, Brown ED. A platform for predicting mechanism of action based on bacterial transcriptional responses identifies an unusual DNA gyrase inhibitor. Cell Rep 2024; 43:114053. [PMID: 38578824 DOI: 10.1016/j.celrep.2024.114053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 02/02/2024] [Accepted: 03/19/2024] [Indexed: 04/07/2024] Open
Abstract
In the search for much-needed new antibacterial chemical matter, a myriad of compounds have been reported in academic and pharmaceutical screening endeavors. Only a small fraction of these, however, are characterized with respect to mechanism of action (MOA). Here, we describe a pipeline that categorizes transcriptional responses to antibiotics and provides hypotheses for MOA. 3D-printed imaging hardware PFIboxes) profiles responses of Escherichia coli promoter-GFP fusions to more than 100 antibiotics. Notably, metergoline, a semi-synthetic ergot alkaloid, mimics a DNA replication inhibitor. In vitro supercoiling assays confirm this prediction, and a potent analog thereof (MLEB-1934) inhibits growth at 0.25 μg/mL and is highly active against quinolone-resistant strains of methicillin-resistant Staphylococcus aureus. Spontaneous suppressor mutants map to a seldom explored allosteric binding pocket, suggesting a mechanism distinct from DNA gyrase inhibitors used in the clinic. In all, the work highlights the potential of this platform to rapidly assess MOA of new antibacterial compounds.
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Affiliation(s)
- Shawn French
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Amelia Bing Ya Guo
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Michael J Ellis
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Julia P Deisinger
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Jarrod W Johnson
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Kenneth Rachwalski
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Zoë A Piquette
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Telmah Lluka
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Miranda Zary
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Sineli Gamage
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Jakob Magolan
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada
| | - Eric D Brown
- McMaster University, Department of Biochemistry and Biomedical Sciences and Michael G. DeGroote Institute for Infectious Disease Research, Hamilton, ON L8S 4L8, Canada.
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3
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Rachwalski K, Tu MM, Madden SJ, French S, Hansen DM, Brown ED. A mobile CRISPRi collection enables genetic interaction studies for the essential genes of Escherichia coli. Cell Rep Methods 2024; 4:100693. [PMID: 38262349 PMCID: PMC10832289 DOI: 10.1016/j.crmeth.2023.100693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 10/27/2023] [Accepted: 12/22/2023] [Indexed: 01/25/2024]
Abstract
Advances in gene editing, in particular CRISPR interference (CRISPRi), have enabled depletion of essential cellular machinery to study the downstream effects on bacterial physiology. Here, we describe the construction of an ordered E. coli CRISPRi collection, designed to knock down the expression of 356 essential genes with the induction of a catalytically inactive Cas9, harbored on the conjugative plasmid pFD152. This mobile CRISPRi library can be conjugated into other ordered genetic libraries to assess combined effects of essential gene knockdowns with non-essential gene deletions. As proof of concept, we probed cell envelope synthesis with two complementary crosses: (1) an Lpp deletion into every CRISPRi knockdown strain and (2) the lolA knockdown plasmid into the Keio collection. These experiments revealed a number of notable genetic interactions for the essential phenotype probed and, in particular, showed suppressing interactions for the loci in question.
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Affiliation(s)
- Kenneth Rachwalski
- Institute of Infectious Disease Research, McMaster University, Hamilton, ON L8S 4L8, Canada; Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - Megan M Tu
- Institute of Infectious Disease Research, McMaster University, Hamilton, ON L8S 4L8, Canada; Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - Sean J Madden
- Institute of Infectious Disease Research, McMaster University, Hamilton, ON L8S 4L8, Canada; Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - Shawn French
- Institute of Infectious Disease Research, McMaster University, Hamilton, ON L8S 4L8, Canada; Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - Drew M Hansen
- Institute of Infectious Disease Research, McMaster University, Hamilton, ON L8S 4L8, Canada; Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - Eric D Brown
- Institute of Infectious Disease Research, McMaster University, Hamilton, ON L8S 4L8, Canada; Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4L8, Canada.
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4
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Liu G, Catacutan DB, Rathod K, Swanson K, Jin W, Mohammed JC, Chiappino-Pepe A, Syed SA, Fragis M, Rachwalski K, Magolan J, Surette MG, Coombes BK, Jaakkola T, Barzilay R, Collins JJ, Stokes JM. Deep learning-guided discovery of an antibiotic targeting Acinetobacter baumannii. Nat Chem Biol 2023; 19:1342-1350. [PMID: 37231267 DOI: 10.1038/s41589-023-01349-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 04/25/2023] [Indexed: 05/27/2023]
Abstract
Acinetobacter baumannii is a nosocomial Gram-negative pathogen that often displays multidrug resistance. Discovering new antibiotics against A. baumannii has proven challenging through conventional screening approaches. Fortunately, machine learning methods allow for the rapid exploration of chemical space, increasing the probability of discovering new antibacterial molecules. Here we screened ~7,500 molecules for those that inhibited the growth of A. baumannii in vitro. We trained a neural network with this growth inhibition dataset and performed in silico predictions for structurally new molecules with activity against A. baumannii. Through this approach, we discovered abaucin, an antibacterial compound with narrow-spectrum activity against A. baumannii. Further investigations revealed that abaucin perturbs lipoprotein trafficking through a mechanism involving LolE. Moreover, abaucin could control an A. baumannii infection in a mouse wound model. This work highlights the utility of machine learning in antibiotic discovery and describes a promising lead with targeted activity against a challenging Gram-negative pathogen.
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Affiliation(s)
- Gary Liu
- Department of Biochemistry and Biomedical Sciences, Michael G. DeGroote Institute for Infectious Disease Research, David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada
| | - Denise B Catacutan
- Department of Biochemistry and Biomedical Sciences, Michael G. DeGroote Institute for Infectious Disease Research, David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada
| | - Khushi Rathod
- Department of Biochemistry and Biomedical Sciences, Michael G. DeGroote Institute for Infectious Disease Research, David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada
| | - Kyle Swanson
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Wengong Jin
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jody C Mohammed
- Department of Biochemistry and Biomedical Sciences, Michael G. DeGroote Institute for Infectious Disease Research, David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada
| | - Anush Chiappino-Pepe
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, USA
- Department of Genetics, Harvard Medical School, Boston, MA, USA
| | - Saad A Syed
- Department of Medicine, Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Meghan Fragis
- Department of Biochemistry and Biomedical Sciences, Michael G. DeGroote Institute for Infectious Disease Research, David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada
| | - Kenneth Rachwalski
- Department of Biochemistry and Biomedical Sciences, Michael G. DeGroote Institute for Infectious Disease Research, David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada
| | - Jakob Magolan
- Department of Biochemistry and Biomedical Sciences, Michael G. DeGroote Institute for Infectious Disease Research, David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada
| | - Michael G Surette
- Department of Medicine, Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Brian K Coombes
- Department of Biochemistry and Biomedical Sciences, Michael G. DeGroote Institute for Infectious Disease Research, David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada
| | - Tommi Jaakkola
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Regina Barzilay
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Cambridge, MA, USA
- Abdul Latif Jameel Clinic for Machine Learning in Health, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - James J Collins
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, USA.
- Abdul Latif Jameel Clinic for Machine Learning in Health, Massachusetts Institute of Technology, Cambridge, MA, USA.
- Department of Biological Engineering, Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, USA.
- Broad Institute of MIT and Harvard, Cambridge, MA, USA.
| | - Jonathan M Stokes
- Department of Biochemistry and Biomedical Sciences, Michael G. DeGroote Institute for Infectious Disease Research, David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada.
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5
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Carfrae LA, Rachwalski K, French S, Gordzevich R, Seidel L, Tsai CN, Tu MM, MacNair CR, Ovchinnikova OG, Clarke BR, Whitfield C, Brown ED. Inhibiting fatty acid synthesis overcomes colistin resistance. Nat Microbiol 2023:10.1038/s41564-023-01369-z. [PMID: 37127701 DOI: 10.1038/s41564-023-01369-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 03/23/2023] [Indexed: 05/03/2023]
Abstract
Treating multidrug-resistant infections has increasingly relied on last-resort antibiotics, including polymyxins, for example colistin. As polymyxins are given routinely, the prevalence of their resistance is on the rise and increases mortality rates of sepsis patients. The global dissemination of plasmid-borne colistin resistance, driven by the emergence of mcr-1, threatens to diminish the therapeutic utility of polymyxins from an already shrinking antibiotic arsenal. Restoring sensitivity to polymyxins using combination therapy with sensitizing drugs is a promising approach to reviving its clinical utility. Here we describe the ability of the biotin biosynthesis inhibitor, MAC13772, to synergize with colistin exclusively against colistin-resistant bacteria. MAC13772 indirectly disrupts fatty acid synthesis (FAS) and restores sensitivity to the last-resort antibiotic, colistin. Accordingly, we found that combinations of colistin and other FAS inhibitors, cerulenin, triclosan and Debio1452-NH3, had broad potential against both chromosomal and plasmid-mediated colistin resistance in chequerboard and lysis assays. Furthermore, combination therapy with colistin and the clinically relevant FabI inhibitor, Debio1452-NH3, showed efficacy against mcr-1 positive Klebsiella pneumoniae and colistin-resistant Escherichia coli systemic infections in mice. Using chemical genomics, lipidomics and transcriptomics, we explored the mechanism of the interaction. We propose that inhibiting FAS restores colistin sensitivity by depleting lipid synthesis, leading to changes in phospholipid composition. In all, this work reveals a surprising link between FAS and colistin resistance.
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Affiliation(s)
- Lindsey A Carfrae
- Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Kenneth Rachwalski
- Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Shawn French
- Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Rodion Gordzevich
- Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Laura Seidel
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Caressa N Tsai
- Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Megan M Tu
- Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Craig R MacNair
- Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Olga G Ovchinnikova
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Bradley R Clarke
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Chris Whitfield
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Eric D Brown
- Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.
- Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada.
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6
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Abu Jarad N, Rachwalski K, Bayat F, Khan S, Shakeri A, MacLachlan R, Villegas M, Brown ED, Hosseinidoust Z, Didar TF, Soleymani L. A Bifunctional Spray Coating Reduces Contamination on Surfaces by Repelling and Killing Pathogens. ACS Appl Mater Interfaces 2023; 15:16253-16265. [PMID: 36926806 DOI: 10.1021/acsami.2c23119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Surface-mediated transmission of pathogens is a major concern with regard to the spread of infectious diseases. Current pathogen prevention methods on surfaces rely on the use of biocides, which aggravate the emergence of antimicrobial resistance and pose harmful health effects. In response, a bifunctional and substrate-independent spray coating is presented herein. The bifunctional coating relies on wrinkled polydimethylsiloxane microparticles, decorated with biocidal gold nanoparticles to induce a "repel and kill" effect against pathogens. Pathogen repellency is provided by the structural hierarchy of the microparticles and their surface chemistry, whereas the kill mechanism is achieved using functionalized gold nanoparticles embedded on the microparticles. Bacterial tests with methicillin-resistant Staphylococcus aureus and Pseudomonas aeruginosa reveal a 99.9% reduction in bacterial load on spray-coated surfaces, while antiviral tests with Phi6─a bacterial virus often used as a surrogate to SARS-CoV-2─demonstrate a 98% reduction in virus load on coated surfaces. The newly developed spray coating is versatile, easily applicable to various surfaces, and effective against various pathogens, making it suitable for reducing surface contamination in frequently touched, heavy traffic, and high-risk surfaces.
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Affiliation(s)
- Noor Abu Jarad
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton L8S 4K1, ON, Canada
| | - Kenneth Rachwalski
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
| | - Fereshteh Bayat
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
| | - Shadman Khan
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
| | - Amid Shakeri
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
| | - Roderick MacLachlan
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
| | - Martin Villegas
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
| | - Eric D Brown
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
| | - Zeinab Hosseinidoust
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
| | - Tohid F Didar
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton L8S 4K1, ON, Canada
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
- School of Biomedical Engineering, Department of Mechanical Engineering, Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton L8S 4L7, Canada
| | - Leyla Soleymani
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton L8S 4K1, ON, Canada
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton L8S 4L7, ON, Canada
- School of Biomedical Engineering and Department of Engineering Physics, Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton L8S 4L7, Canada
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7
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Abu Jarad N, Rachwalski K, Bayat F, Khan S, Shakeri A, MacLachlan R, Villegas M, Brown ED, Soleymani L, Didar TF. An Omniphobic Spray Coating Created from Hierarchical Structures Prevents the Contamination of High-Touch Surfaces with Pathogens. Small 2023; 19:e2205761. [PMID: 36587985 DOI: 10.1002/smll.202205761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Engineered surfaces that repel pathogens are of great interest due to their role in mitigating the spread of infectious diseases. A robust, universal, and scalable omniphobic spray coating with excellent repellency against water, oil, and pathogens is presented. The coating is substrate-independent and relies on hierarchically structured polydimethylsiloxane (PDMS) microparticles, decorated with gold nanoparticles (AuNPs). Wettability studies reveal the relationship between surface texturing of micro- and/or nano-hierarchical structures and the omniphobicity of the coating. Studies of pathogen transfer with bacteria and viruses reveal that an uncoated contaminated glove transfers pathogens to >50 subsequent surfaces, while a coated glove picks up 104 (over 99.99%) less pathogens upon first contact and transfers zero pathogens after the second touch. The developed coating also provides excellent stability under harsh conditions. The remarkable anti-pathogen properties of this surface combined with its ease of implementation, substantiate its use for the prevention of surface-mediated transmission of pathogens.
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Affiliation(s)
- Noor Abu Jarad
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada
| | - Kenneth Rachwalski
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, ON, L8N 3Z5, Canada
| | - Fereshteh Bayat
- Department of Mechanical Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada
| | - Shadman Khan
- Department of Mechanical Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada
| | - Amid Shakeri
- Department of Mechanical Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada
| | - Roderick MacLachlan
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
| | - Martin Villegas
- Department of Mechanical Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada
| | - Eric D Brown
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, ON, L8N 3Z5, Canada
| | - Leyla Soleymani
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
- Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON, L8S 4K1, Canada
| | - Tohid F Didar
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada
- Department of Mechanical Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada
- Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON, L8S 4K1, Canada
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8
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Alcock BP, Huynh W, Chalil R, Smith KW, Raphenya A, Wlodarski MA, Edalatmand A, Petkau A, Syed SA, Tsang KK, Baker SJC, Dave M, McCarthy M, Mukiri KM, Nasir JA, Golbon B, Imtiaz H, Jiang X, Kaur K, Kwong M, Liang ZC, Niu KC, Shan P, Yang JYJ, Gray K, Hoad GR, Jia B, Bhando T, Carfrae L, Farha M, French S, Gordzevich R, Rachwalski K, Tu M, Bordeleau E, Dooley D, Griffiths E, Zubyk HL, Brown ED, Maguire F, Beiko R, Hsiao WWL, Brinkman FSL, Van Domselaar G, McArthur AG. CARD 2023: expanded curation, support for machine learning, and resistome prediction at the Comprehensive Antibiotic Resistance Database. Nucleic Acids Res 2022; 51:D690-D699. [PMID: 36263822 PMCID: PMC9825576 DOI: 10.1093/nar/gkac920] [Citation(s) in RCA: 187] [Impact Index Per Article: 93.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/03/2022] [Accepted: 10/11/2022] [Indexed: 01/30/2023] Open
Abstract
The Comprehensive Antibiotic Resistance Database (CARD; card.mcmaster.ca) combines the Antibiotic Resistance Ontology (ARO) with curated AMR gene (ARG) sequences and resistance-conferring mutations to provide an informatics framework for annotation and interpretation of resistomes. As of version 3.2.4, CARD encompasses 6627 ontology terms, 5010 reference sequences, 1933 mutations, 3004 publications, and 5057 AMR detection models that can be used by the accompanying Resistance Gene Identifier (RGI) software to annotate genomic or metagenomic sequences. Focused curation enhancements since 2020 include expanded β-lactamase curation, incorporation of likelihood-based AMR mutations for Mycobacterium tuberculosis, addition of disinfectants and antiseptics plus their associated ARGs, and systematic curation of resistance-modifying agents. This expanded curation includes 180 new AMR gene families, 15 new drug classes, 1 new resistance mechanism, and two new ontological relationships: evolutionary_variant_of and is_small_molecule_inhibitor. In silico prediction of resistomes and prevalence statistics of ARGs has been expanded to 377 pathogens, 21,079 chromosomes, 2,662 genomic islands, 41,828 plasmids and 155,606 whole-genome shotgun assemblies, resulting in collation of 322,710 unique ARG allele sequences. New features include the CARD:Live collection of community submitted isolate resistome data and the introduction of standardized 15 character CARD Short Names for ARGs to support machine learning efforts.
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Affiliation(s)
- Brian P Alcock
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - William Huynh
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Romeo Chalil
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Keaton W Smith
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Amogelang R Raphenya
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Mateusz A Wlodarski
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Arman Edalatmand
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Aaron Petkau
- Department of Computer Science, University of Manitoba, Winnipeg, Manitoba, Canada,National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Sohaib A Syed
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Kara K Tsang
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Sheridan J C Baker
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Mugdha Dave
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Madeline C McCarthy
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Karyn M Mukiri
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Jalees A Nasir
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Bahar Golbon
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Hamna Imtiaz
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Xingjian Jiang
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Komal Kaur
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Megan Kwong
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Zi Cheng Liang
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Keyu C Niu
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Prabakar Shan
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Jasmine Y J Yang
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Kristen L Gray
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Gemma R Hoad
- Research Computing Group, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Baofeng Jia
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Timsy Bhando
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Lindsey A Carfrae
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Maya A Farha
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Shawn French
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Rodion Gordzevich
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Kenneth Rachwalski
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Megan M Tu
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Emily Bordeleau
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Damion Dooley
- Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Emma Griffiths
- Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Haley L Zubyk
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Eric D Brown
- David Braley Centre for Antibiotic Discovery, McMaster University, Hamilton, Ontario, Canada,Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Finlay Maguire
- Faculty of Computer Science, Dalhousie University, Halifax, Nova Scotia, Canada,Institute for Comparative Genomics, Dalhousie University, Halifax, Nova Scotia, Canada,Department of Community Health & Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Robert G Beiko
- Faculty of Computer Science, Dalhousie University, Halifax, Nova Scotia, Canada,Institute for Comparative Genomics, Dalhousie University, Halifax, Nova Scotia, Canada
| | - William W L Hsiao
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia, Canada,Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Fiona S L Brinkman
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Gary Van Domselaar
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada,Department of Medical Microbiology and Infectious Diseases, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Andrew G McArthur
- To whom correspondence should be addressed. Tel: +1 905 525 9140 (Ext 21663);
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9
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Khan S, Jarad NA, Ladouceur L, Rachwalski K, Bot V, Shakeri A, Maclachlan R, Sakib S, Weitz JI, Brown ED, Soleymani L, Didar TF. Transparent and Highly Flexible Hierarchically Structured Polydimethylsiloxane Surfaces Suppress Bacterial Attachment and Thrombosis Under Static and Dynamic Conditions. Small 2022; 18:e2108112. [PMID: 35224860 DOI: 10.1002/smll.202108112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Indexed: 06/14/2023]
Abstract
The surface fouling of biomedical devices has been an ongoing issue in healthcare. Bacterial and blood adhesion in particular, severely impede the performance of such tools, leading to poor patient outcomes. Various structural and chemical modifications have been shown to reduce fouling, but all existing strategies lack the combination of physical, chemical, and economic traits necessary for widespread use. Herein, a lubricant infused, hierarchically micro- and nanostructured polydimethylsiloxane surface is presented. The surface is easy to produce and exhibits the high flexibility and optical transparency necessary for incorporation into various biomedical tools. Tests involving two clinically relevant, priority pathogens show up to a 98.5% reduction in the biofilm formation of methicillin-resistant Staphylococcus aureus and Pseudomonas aeruginosa. With blood, the surface reduces staining by 95% and suppresses thrombin generation to background levels. Furthermore, the surface shows applicability within applications such as catheters, extracorporeal circuits, and microfluidic devices, through its effectiveness in dynamic conditions. The perfusion of bacterial media shows up to 96.5% reduction in bacterial adhesion. Similarly, a 95.8% reduction in fibrin networks is observed following whole blood perfusion. This substrate stands to hold high applicability within biomedical systems as a means to prevent fouling, thus improving performance.
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Affiliation(s)
- Shadman Khan
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
| | - Noor Abu Jarad
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
| | - Liane Ladouceur
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
| | - Kenneth Rachwalski
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, ON, L8N 3Z5, Canada
| | - Veronica Bot
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
| | - Amid Shakeri
- Department of Mechanical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
| | - Roderick Maclachlan
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON, L8S4L7, Canada
| | - Sadman Sakib
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON, L8S4L7, Canada
| | - Jeffrey I Weitz
- Departments of Medicine and Biochemistry and Biomedical Sciences, McMaster University and the Thrombosis & Atherosclerosis Research Institute, 237 Barton Street East, Hamilton, ON, L8L 2X2, Canada
| | - Eric D Brown
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, ON, L8N 3Z5, Canada
| | - Leyla Soleymani
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON, L8S4L7, Canada
| | - Tohid F Didar
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
- Department of Mechanical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
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10
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Imani SM, Maclachlan R, Rachwalski K, Chan Y, Lee B, McInnes M, Grandfield K, Brown ED, Didar TF, Soleymani L. Flexible Hierarchical Wraps Repel Drug-Resistant Gram-Negative and Positive Bacteria. ACS Nano 2020; 14:454-465. [PMID: 31834780 DOI: 10.1021/acsnano.9b06287] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Healthcare acquired infections are a major human health problem, and are becoming increasingly troublesome with the emergence of drug resistant bacteria. Engineered surfaces that reduce the adhesion, proliferation, and spread of bacteria have promise as a mean of preventing infections and reducing the use of antibiotics. To address this need, we created a flexible plastic wrap that combines a hierarchical wrinkled structure with chemical functionalization to reduce bacterial adhesion, biofilm formation, and the transfer of bacteria through an intermediate surface. These hierarchical wraps were effective for reducing biofilm formation of World Health Organization-designated priority pathogens Gram positive methicillin-resistant Staphylococcus aureus (MRSA) and Gram negative Pseudomonas aeruginosa by 87 and 84%, respectively. In addition, these surfaces remain free of bacteria after being touched by a contaminated surface with Gram negative E. coli. We showed that these properties are the result of broad liquid repellency of the engineered surfaces and the presence of reduced anchor points for bacterial adhesion on the hierarchical structure. Such wraps are fabricated using scalable bottom-up techniques and form an effective cover on a variety of complex objects, making them superior to top-down and substrate-specific surface modification methods.
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Affiliation(s)
- Sara M Imani
- McMaster University , School of Biomedical Engineering , 1280 Main Street West , Hamilton , L8S 4L7 , Canada
| | - Roderick Maclachlan
- McMaster University , Department of Engineering Physics , 1280 Main Street West , Hamilton , L8S 4L7 , Canada
| | - Kenneth Rachwalski
- Department of Biochemistry and Biomedical Sciences , McMaster University , Hamilton , ON L8N 3Z5 , Canada
- Michael G. DeGroote Institute of Infectious Disease Research , McMaster University , Hamilton , ON L8N 3Z5 , Canada
| | - Yuting Chan
- McMaster University , Department of Engineering Physics , 1280 Main Street West , Hamilton , L8S 4L7 , Canada
| | - Bryan Lee
- McMaster University , School of Biomedical Engineering , 1280 Main Street West , Hamilton , L8S 4L7 , Canada
| | - Mark McInnes
- OptiSolve ® , Peterborough , ON K9J 6 × 6 , Canada
| | - Kathryn Grandfield
- McMaster University , School of Biomedical Engineering , 1280 Main Street West , Hamilton , L8S 4L7 , Canada
- Department of Materials Science and Engineering , McMaster University , Hamilton , Ontario Canada
| | - Eric D Brown
- Department of Biochemistry and Biomedical Sciences , McMaster University , Hamilton , ON L8N 3Z5 , Canada
- Michael G. DeGroote Institute of Infectious Disease Research , McMaster University , Hamilton , ON L8N 3Z5 , Canada
| | - Tohid F Didar
- McMaster University , School of Biomedical Engineering , 1280 Main Street West , Hamilton , L8S 4L7 , Canada
- Michael G. DeGroote Institute of Infectious Disease Research , McMaster University , Hamilton , ON L8N 3Z5 , Canada
- Department of Mechanical Engineering , McMaster University , Hamilton , Ontario Canada
| | - Leyla Soleymani
- McMaster University , School of Biomedical Engineering , 1280 Main Street West , Hamilton , L8S 4L7 , Canada
- McMaster University , Department of Engineering Physics , 1280 Main Street West , Hamilton , L8S 4L7 , Canada
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11
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Krzykała M, Konarski JM, Malina RM, Rachwalski K, Leszczyński P, Ziółkowska-Łajp E. Fatness of female field hockey players: Comparison of estimates with different methods. Homo 2016; 67:245-57. [PMID: 27181627 DOI: 10.1016/j.jchb.2016.03.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Accepted: 03/18/2016] [Indexed: 10/21/2022]
Abstract
The aim of the study was to compare relative body fat (% fat) in female field hockey players using several methods with dual-energy X-ray absorptiometry (DXA) as the reference. Participants were 31 Polish hockey players 16-30 years of age, 17 national and 14 youth level. Percent body fat was estimated by DXA (reference method), conventional and segmental bioelectrical impedance analysis (BIA), and predicted from skinfolds (SKF). National and youth team members did not differ in estimated body fat. Correlations between BIA and skinfold estimates of % fat and DXA % fat though significant, were moderate. Both % fat SKF and % fat SBIA differed significantly from % fat DXA, while estimated % fat BIA and % fat DXA did not differ. Limits of agreement were narrow for conventional BIA (-1.20 to 1.71% fat), followed by segmental BIA (3.72-6.09% fat) and broadest for SKF (5.97-9.28% fat). Differences between DXA % fat and estimated % fat with SKF and SBIA increased from the leanest to fattest athletes, whereas conventional BIA overestimated % fat relative to DXA in the small sample of individuals with low relative fatness and underestimated % fat in individuals with elevated relative fatness. Estimated % fat from conventional BIA most closely approximated DXA % fat in this sample of female field hockey players suggesting that the method may be suitable for field surveys to monitor body composition during the season.
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Affiliation(s)
- M Krzykała
- University School of Physical Education, Department of Recreation, Poznań, Poland.
| | - J M Konarski
- University School of Physical Education, Theory of the Sport Department, Poznań, Poland
| | - R M Malina
- Department of Kinesiology and Health Education, University of Texas at Austin, Austin, TX, USA; Department of Kinesiology, Tarleton State University, Stephenville, TX, USA
| | - K Rachwalski
- University School of Physical Education, Department of Team Sports Games, Poznań, Poland
| | - P Leszczyński
- University of Medical Sciences, Physiotherapy, Rheumatology and Rehabilitation Department, Poland; Laboratory of Bone and Connective Tissue Metabolism Diseases, Poznań, Poland
| | - E Ziółkowska-Łajp
- University School of Physical Education, Anthropology and Biometry Department, Poznań, Poland
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