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  1. Artikel ; Online: Assessment of mutations induced by cold atmospheric plasma jet treatment relative to known mutagens in Escherichia coli.

    Patenall, Bethany L / Hathaway, Hollie J / Laabei, Maisem / Young, Amber E / Thet, Naing T / Jenkins, A Toby A / Short, Robert D / Allinson, Sarah L

    Mutagenesis

    2021  Band 36, Heft 5, Seite(n) 380–387

    Abstract: The main bactericidal components of cold atmospheric plasma (CAP) are thought to be reactive oxygen and nitrogen species (RONS) and UV-radiation, both of which have the capacity to cause DNA damage and mutations. Here, the mutagenic effects of CAP on ... ...

    Abstract The main bactericidal components of cold atmospheric plasma (CAP) are thought to be reactive oxygen and nitrogen species (RONS) and UV-radiation, both of which have the capacity to cause DNA damage and mutations. Here, the mutagenic effects of CAP on Escherichia coli were assessed in comparison to X- and UV-irradiation. DNA damage and mutagenesis were screened for using a diffusion-based DNA fragmentation assay and modified Ames test, respectively. Mutant colonies obtained from the latter were quantitated and sequenced. CAP was found to elicit a similar mutation spectrum to X-irradiation, which did not resemble that for UV implying that CAP-produced RONS are more likely the mutagenic component of CAP. CAP treatment was also shown to promote resistance to the antibiotic ciprofloxacin. Our data suggest that CAP treatment has mutagenic effects that may have important phenotypic consequences.
    Mesh-Begriff(e) DNA Damage/drug effects ; DNA Fragmentation ; Dose-Response Relationship, Drug ; Drug Resistance, Bacterial ; Escherichia coli/drug effects ; Escherichia coli/genetics ; Mutagenesis/drug effects ; Mutagens/pharmacology ; Mutation/drug effects ; Plasma Gases/pharmacology ; Ultraviolet Rays ; X-Rays
    Chemische Substanzen Mutagens ; Plasma Gases
    Sprache Englisch
    Erscheinungsdatum 2021-08-29
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 632903-2
    ISSN 1464-3804 ; 0267-8357
    ISSN (online) 1464-3804
    ISSN 0267-8357
    DOI 10.1093/mutage/geab030
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Emerging medical and engineering strategies for the prevention of long-term indwelling catheter blockage.

    Milo, Scarlet / Nzakizwanayo, Jonathan / Hathaway, Hollie J / Jones, Brian V / Jenkins, A Toby A

    Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine

    2018  Band 233, Heft 1, Seite(n) 68–83

    Abstract: Urinary catheters have been used on an intermittent or indwelling basis for centuries, in order to relieve urinary retention and incontinence. Nevertheless, the use of urinary catheters in the clinical setting is fraught with complication, the most ... ...

    Abstract Urinary catheters have been used on an intermittent or indwelling basis for centuries, in order to relieve urinary retention and incontinence. Nevertheless, the use of urinary catheters in the clinical setting is fraught with complication, the most common of which is the development of nosocomial urinary tract infections, known as catheter-associated urinary tract infections. Infections of this nature are not only significant owing to their high incidence rate and subsequent economic burden but also to the severe medical consecutions that result. A range of techniques have been employed in recent years, utilising various technologies in attempts to counteract the perilous medical cascade following catheter blockage. This review will focus on the current advancement (within the last 10 years) in prevention of encrustation and blockage of long-term indwelling catheters both from engineering and medical perspectives, with particular emphasis on the importance of stimuli-responsive systems.
    Mesh-Begriff(e) Anti-Bacterial Agents/pharmacology ; Catheters, Indwelling/adverse effects ; Engineering/methods ; Equipment Failure ; Humans ; Urinary Catheters
    Chemische Substanzen Anti-Bacterial Agents
    Sprache Englisch
    Erscheinungsdatum 2018-05-28
    Erscheinungsland England
    Dokumenttyp Journal Article ; Review
    ZDB-ID 1065942-0
    ISSN 2041-3033 ; 0046-2039 ; 0954-4119
    ISSN (online) 2041-3033
    ISSN 0046-2039 ; 0954-4119
    DOI 10.1177/0954411918776691
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: A small-molecular inhibitor against Proteus mirabilis urease to treat catheter-associated urinary tract infections.

    Milo, Scarlet / Heylen, Rachel A / Glancy, John / Williams, George T / Patenall, Bethany L / Hathaway, Hollie J / Thet, Naing T / Allinson, Sarah L / Laabei, Maisem / Jenkins, A Toby A

    Scientific reports

    2021  Band 11, Heft 1, Seite(n) 3726

    Abstract: Infection and blockage of indwelling urinary catheters is significant owing to its high incidence rate and severe medical consequences. Bacterial enzymes are employed as targets for small molecular intervention in human bacterial infections. Urease is a ... ...

    Abstract Infection and blockage of indwelling urinary catheters is significant owing to its high incidence rate and severe medical consequences. Bacterial enzymes are employed as targets for small molecular intervention in human bacterial infections. Urease is a metalloenzyme known to play a crucial role in the pathogenesis and virulence of catheter-associated Proteus mirabilis infection. Targeting urease as a therapeutic candidate facilitates the disarming of bacterial virulence without affecting bacterial fitness, thereby limiting the selective pressure placed on the invading population and lowering the rate at which it will acquire resistance. We describe the design, synthesis, and in vitro evaluation of the small molecular enzyme inhibitor 2-mercaptoacetamide (2-MA), which can prevent encrustation and blockage of urinary catheters in a physiologically representative in vitro model of the catheterized urinary tract. 2-MA is a structural analogue of urea, showing promising competitive activity against urease. In silico docking experiments demonstrated 2-MA's competitive inhibition, whilst further quantum level modelling suggests two possible binding mechanisms.
    Mesh-Begriff(e) Amidines/pharmacology ; Amidines/therapeutic use ; HaCaT Cells ; Humans ; Molecular Docking Simulation ; Molecular Targeted Therapy ; Proteus Infections/drug therapy ; Proteus mirabilis/enzymology ; Toxicity Tests ; Urease/antagonists & inhibitors ; Urinary Catheterization/adverse effects ; Urinary Tract Infections/drug therapy ; Urinary Tract Infections/microbiology
    Chemische Substanzen Amidines ; 2-mercaptoacetamidine (19412-52-3) ; Urease (EC 3.5.1.5)
    Sprache Englisch
    Erscheinungsdatum 2021-02-12
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-83257-2
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel ; Online: Development of an Infection-Responsive Fluorescent Sensor for the Early Detection of Urinary Catheter Blockage.

    Milo, Scarlet / Acosta, Florianne B / Hathaway, Hollie J / Wallace, Laura A / Thet, Naing T / Jenkins, A Toby A

    ACS sensors

    2018  Band 3, Heft 3, Seite(n) 612–617

    Abstract: Formation of crystalline biofilms following infection by Proteus mirabilis can lead to encrustation and blockage of long-term indwelling catheters, with serious clinical consequences. We describe a simple sensor, placed within the catheter drainage bag, ... ...

    Abstract Formation of crystalline biofilms following infection by Proteus mirabilis can lead to encrustation and blockage of long-term indwelling catheters, with serious clinical consequences. We describe a simple sensor, placed within the catheter drainage bag, to alert of impending blockage via a urinary color change. The pH-responsive sensor is a dual-layered polymeric "lozenge", able to release the self-quenching dye 5(6)-carboxyfluorescein in response to the alkaline urine generated by the expression of bacterial urease. Sensor performance was evaluated within a laboratory model of the catheterized urinary tract, infected with both urease positive and negative bacterial strains under conditions of established infection, achieving an average "early warning" of catheter blockage of 14.5 h. Signaling only occurred following infection with urease positive bacteria. Translation of these sensors into a clinical environment would allow appropriate intervention before the occurrence of catheter blockage, a problem for which there is currently no effective control method.
    Mesh-Begriff(e) Fluorescent Dyes/chemistry ; Humans ; Hydrogen-Ion Concentration ; Proteus Infections/diagnostic imaging ; Proteus mirabilis/isolation & purification ; Urinary Catheters/microbiology
    Chemische Substanzen Fluorescent Dyes
    Sprache Englisch
    Erscheinungsdatum 2018-02-14
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2379-3694
    ISSN (online) 2379-3694
    DOI 10.1021/acssensors.7b00861
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel ; Online: Reaction-based indicator displacement assay (RIA) for the development of a triggered release system capable of biofilm inhibition.

    Patenall, Bethany L / Williams, George T / Gwynne, Lauren / Stephens, Liam J / Lampard, Emma V / Hathaway, Hollie J / Thet, Naing T / Young, Amber E / Sutton, Mark J / Short, Robert D / Bull, Steven D / James, Tony D / Sedgwick, Adam C / Jenkins, A Toby A

    Chemical communications (Cambridge, England)

    2019  Band 55, Heft 100, Seite(n) 15129–15132

    Abstract: Here, a reaction-based indicator displacement hydrogel assay (RIA) was developed for the detection of hydrogen peroxide (H2O2) via the oxidative release of the optical reporter Alizarin Red S (ARS). In the presence of H2O2, the RIA system displayed ... ...

    Abstract Here, a reaction-based indicator displacement hydrogel assay (RIA) was developed for the detection of hydrogen peroxide (H2O2) via the oxidative release of the optical reporter Alizarin Red S (ARS). In the presence of H2O2, the RIA system displayed potent biofilm inhibition for Methicillin-resistant Staphylococcus aureus (MRSA), as shown through an in vitro assay quantifying antimicrobial efficacy. This work demonstrated the potential of H2O2-responsive hydrogels containing a covalently bound diol-based drug for controlled drug release.
    Mesh-Begriff(e) Anthraquinones/chemistry ; Anthraquinones/pharmacology ; Anti-Bacterial Agents/chemistry ; Anti-Bacterial Agents/pharmacology ; Biofilms/drug effects ; Escherichia coli/drug effects ; Hydrogels/chemistry ; Hydrogels/pharmacology ; Hydrogen Peroxide/chemistry ; Methicillin-Resistant Staphylococcus aureus/physiology ; Microbial Sensitivity Tests ; Pseudomonas aeruginosa/drug effects ; Solubility
    Chemische Substanzen Anthraquinones ; Anti-Bacterial Agents ; Hydrogels ; Alizarin Red S (3F3AT0Q12H) ; Hydrogen Peroxide (BBX060AN9V)
    Sprache Englisch
    Erscheinungsdatum 2019-11-15
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/c9cc07759f
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel: Reaction-based indicator displacement assay (RIA) for the development of a triggered release system capable of biofilm inhibition

    Patenall, Bethany L / Williams‡, George T / Gwynne, Lauren / Stephens, Liam J / Lampard, Emma V / Hathaway, Hollie J / Thet, Naing T / Young, Amber E / Sutton, Mark J / Short, Robert D / Bull, Steven D / James, Tony D / Sedgwick, Adam C / Jenkins, A. Toby A

    Chemical communications. 2019 Dec. 12, v. 55, no. 100

    2019  

    Abstract: Here, a reaction-based indicator displacement hydrogel assay (RIA) was developed for the detection of hydrogen peroxide (H₂O₂) via the oxidative release of the optical reporter Alizarin Red S (ARS). In the presence of H₂O₂, the RIA system displayed ... ...

    Abstract Here, a reaction-based indicator displacement hydrogel assay (RIA) was developed for the detection of hydrogen peroxide (H₂O₂) via the oxidative release of the optical reporter Alizarin Red S (ARS). In the presence of H₂O₂, the RIA system displayed potent biofilm inhibition for Methicillin-resistant Staphylococcus aureus (MRSA), as shown through an in vitro assay quantifying antimicrobial efficacy. This work demonstrated the potential of H₂O₂-responsive hydrogels containing a covalently bound diol-based drug for controlled drug release.
    Schlagwörter alizarin ; antibiotic resistance ; antimicrobial properties ; biofilm ; chemical bonding ; chemical reactions ; drug delivery systems ; hydrogels ; hydrogen peroxide ; in vitro studies ; methicillin ; methicillin-resistant Staphylococcus aureus ; radioimmunoassays
    Sprache Englisch
    Erscheinungsverlauf 2019-1212
    Umfang p. 15129-15132.
    Erscheinungsort The Royal Society of Chemistry
    Dokumenttyp Artikel
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/c9cc07759f
    Datenquelle NAL Katalog (AGRICOLA)

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