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Gugsch F, Tan CK, Oh DY, Paßvogel L, Steinhauer K. Efficacy of octenidine- and chlorhexidine-based wash-mitts against Candida albicans and Candida auris - a comparative study. J Hosp Infect 2024; 143:91-96. [PMID: 37949371 DOI: 10.1016/j.jhin.2023.10.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 10/13/2023] [Accepted: 10/22/2023] [Indexed: 11/12/2023]
Abstract
BACKGROUND Management of outbreaks of the newly emerging pathogen Candida auris may include use of antimicrobial wash-mitts for decolonization. However, currently there is little clinical evidence to support the wide adoption of 'whole-body decolonization' as part of the protocol to effectively manage C. auris outbreaks. The aim of this study was to investigate the chemical tolerance of C. auris compared with the surrogate test organism Candida albicans as established in the European Standards (EN). METHODS Two commercially available antiseptic-impregnated wash-mitts based on either chlorhexidine digluconate (CHG) or octenidine dihydrochloride (OCT) were studied. Comparison of susceptibility of C. auris and C. albicans was investigated based on the standardized test protocol EN 13624. Experiments were conducted using the impregnation liquid squeezed from the wash-mitts at a contact time of 30 s at different concentrations between 0.5% and 97% in the presence of low organic soiling. FINDINGS Yeasticidal efficacy according to EN 13624 was found for the OCT wash-mitts at 30 s at ≥10% concentration with C. albicans. In comparison, reduction ≥4 log10 was found at a much lower concentration of ≥1% for both C. auris strains. For the CHG wash-mitts, efficacy against C. albicans was below 2 log10 reduction at 97% concentration within 30 s. Efficacy against the two C. auris strains was around 3 log10 reduction. CONCLUSION Both C. auris strains were found to be significantly more susceptible when compared with C. albicans. Data also demonstrate that not all antiseptic-impregnated wash-mitts are equally effective against C. auris with OCT having a higher efficacy compared with CHG.
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Affiliation(s)
- F Gugsch
- bactologicum GmbH, Itzehoe, Germany
| | - C K Tan
- bactologicum GmbH, Itzehoe, Germany
| | - D Y Oh
- Schülke & Mayr GmbH, Norderstedt, Germany
| | - L Paßvogel
- Schülke & Mayr GmbH, Norderstedt, Germany
| | - K Steinhauer
- bactologicum GmbH, Itzehoe, Germany; University of Applied Sciences, Kiel, Germany.
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2
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Pandian M, Kumar VA, Jayakumar R. Antiseptic chitosan bandage for preventing topical skin infections. Int J Biol Macromol 2021; 193:1653-1658. [PMID: 34742845 DOI: 10.1016/j.ijbiomac.2021.11.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 10/18/2021] [Accepted: 11/01/2021] [Indexed: 01/16/2023]
Abstract
Infections on the wound surface are the major problem in restricting the healing process. To reduce the transmission and treat the infection, we have developed 0.05% and 0.1% octenidine dihydrochloride (Ocd) incorporated chitosan (Cs) based flexible bandages. Ocd is extensively used skin antiseptic for its mode of action over a broad spectrum of antimicrobial activity. The prepared antiseptic Cs-Ocd bandage was characterized using Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM). In addition, swelling, degradation, cytocompability, antibacterial, and anti-biofilm property of the developed bandages were studied. This highly porous nature of Cs-Ocd bandage showed enhanced swelling property, slow degradation profile and controlled release of Ocd. The prepared antiseptic bandage exhibited synergistic effect showing good hemostatic potential with Cs, excellent antimicrobial and anti-biofilm activity with Ocd against Staphylococcus aureus (S. aureus) and Candida auris (C. auris). Thus, the developed Cs-Ocd bandage can be used as potential antiseptic bandage for skin infections.
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Affiliation(s)
- Mahalakshmi Pandian
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi 682041, Kerala, India
| | - V Anil Kumar
- Department of Microbiology, Amrita Institute of Medical Sciences and Research Centre, Amrita Vishwa Vidyapeetham, Kochi 682041, India
| | - R Jayakumar
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi 682041, Kerala, India.
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Pavlík V, Sobotka L, Pejchal J, Čepa M, Nešporová K, Arenbergerová M, Mrózková A, Velebný V. Silver distribution in chronic wounds and the healing dynamics of chronic wounds treated with dressings containing silver and octenidine. FASEB J 2021; 35:e21580. [PMID: 33908652 DOI: 10.1096/fj.202100065r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 03/08/2021] [Accepted: 03/25/2021] [Indexed: 12/22/2022]
Abstract
Although silver is an efficient antimicrobial and is a widely used antiseptic in wound healing, previous studies have reported the cytotoxic in vitro effects of silver dressings. Moreover, few studies have addressed the distribution of silver in chronic wounds. The study compares the healing of chronic wounds treated with a standard-of-care silver dressing (Ag-CMC) and a dressing containing antiseptic octenidine (OCT-HA). Biopsies were taken from two wound areas before the commencement of treatment (baseline), after 2 weeks and after 6 weeks (the end of the study). We analyzed the histopathologic wound-healing score, silver distribution, and expression of selected genes. The wound-healing score improved significantly in the wounded area treated with OCT-HA after 2 weeks compared to the baseline and the Ag-CMC. The Ag-CMC wound areas improved after 6 weeks compared to the baseline. Moreover, collagen maturation and decreases in the granulocyte and macrophage counts were faster in the OCT-HA parts. Treatment with OCT-HA resulted in less wound slough. The silver, visualized via autometallography, penetrated approximately 2 mm into the wound tissue and associated around capillaries and ECM fibers, and was detected in phagocytes. The metallothionein gene expression was elevated in the Ag-CMC wound parts. This exploratory study determined the penetration of silver into human chronic wounds and changes in the distribution thereof during treatment. We observed that silver directly affects the cells in the wound and elevates the metallothionein gene expression. Octenidine and hyaluronan dressings provide a suitable alternative to silver and carboxymethyl cellulose dressings without supplying silver to the wound.
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Affiliation(s)
- Vojtěch Pavlík
- Cell Physiology Research Group, Contipro a.s., Dolni Dobrouc, Czech Republic.,Department of Dermatovenereology, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Luboš Sobotka
- Third Department of Medicine, Faculty Hospital and Medical Faculty - Charles University, Hradec Kralove, Czech Republic
| | - Jaroslav Pejchal
- Department of Toxicology and Military Pharmacy, Faculty of Military Health Sciences, The University of Defense in Brno, Hradec Kralove, Czech Republic
| | - Martin Čepa
- Cell Physiology Research Group, Contipro a.s., Dolni Dobrouc, Czech Republic
| | - Kristina Nešporová
- Cell Physiology Research Group, Contipro a.s., Dolni Dobrouc, Czech Republic
| | - Monika Arenbergerová
- Department of Dermatovenereology, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Adéla Mrózková
- Department of Hygiene and Preventive Medicine, Medical Faculty, Charles University, Hradec Kralove, Czech Republic
| | - Vladimír Velebný
- Cell Physiology Research Group, Contipro a.s., Dolni Dobrouc, Czech Republic
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4
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Rzycki M, Drabik D, Szostak-Paluch K, Hanus-Lorenz B, Kraszewski S. Unraveling the mechanism of octenidine and chlorhexidine on membranes: Does electrostatics matter? Biophys J 2021; 120:3392-3408. [PMID: 34214528 PMCID: PMC8391085 DOI: 10.1016/j.bpj.2021.06.027] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 04/26/2021] [Accepted: 06/22/2021] [Indexed: 11/20/2022] Open
Abstract
The increasing problem of antibiotic resistance in bacteria requires the development of new antimicrobial candidates. There are several well-known substances with commercial use, but their molecular mode of action is not fully understood. In this work, we focus on two commonly used antimicrobial agents from the detergent family—octenidine dichloride (OCT) and chlorhexidine digluconate (CHX). Both of them are reported to be agents selectively attacking the cell membrane through interaction inducing membrane disruption by emulsification. They are believed to present electrostatic selectivity toward charged lipids. In this study, we tested this hypothesis and revised previously proposed molecular mechanisms of action. Employing a variety of techniques such as molecular dynamics, ζ potential with dynamic light scattering, vesicle fluctuation spectroscopy, carboxyfluorescein leakage measurement, and fluorescence trimethylammonium-diphenylhexatriene- and diphenylhexatriene-based studies for determination of OCT and CHX membrane location, we performed experimental studies using two model membrane systems—zwitterionic PC and negatively charged PG (18:1/18:1):PC (16:0/18:1) 3:7, respectively. These studies were extended by molecular dynamics simulations performed on a three-component bacterial membrane model system to further test interactions with another negatively charged lipid, cardiolipin. In summary, our study demonstrated that detergent selectivity is far more complicated than supposed simple electrostatic interactions. Although OCT does disrupt the membrane, our results suggest that its primary selectivity was more linked to mechanical properties of the membrane. On the other hand, CHX did not disrupt membranes as a primary activity, nor did it show any sign of electrostatic selectivity toward negatively charged membranes at any stage of interactions, which suggests membrane disruption by influencing more discrete membrane properties.
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Affiliation(s)
- Mateusz Rzycki
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wroclaw, Poland; Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wroclaw, Poland.
| | - Dominik Drabik
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wroclaw, Poland; Laboratory of Cytobiochemistry, Faculty of Biotechnology, University of Wroclaw, Wroclaw, Poland
| | - Kamila Szostak-Paluch
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wroclaw, Poland; Research and Development Center, Regional Specialized Hospital, Wroclaw, Poland
| | - Beata Hanus-Lorenz
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wroclaw, Poland
| | - Sebastian Kraszewski
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wroclaw, Poland
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Vaitkienė S, Daugelavičius R, Sychrová H, Kodedová M. Styrylpyridinium Derivatives as New Potent Antifungal Drugs and Fluorescence Probes. Front Microbiol 2020; 11:2077. [PMID: 32983055 PMCID: PMC7483583 DOI: 10.3389/fmicb.2020.02077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 08/06/2020] [Indexed: 11/26/2022] Open
Abstract
The incidence of Candida glabrata infections increases every year due to its higher resistance to commonly used antifungal drugs. We characterized the antifungal mechanism of action of eight new styrylpyridinium derivatives, with various N-alkyl chains (-C6H13, -C8H17, -C10H21, -C12H25) and different substituents, on C. glabrata strains differing in their drug resistance due to the presence or absence of two major drug-efflux pumps. We found that the tested styrylpyridinium compounds affected the growth of C. glabrata cells in a compound- and strain-dependent manner, and apparently they were substrates of CgCdr1 and CgCdr2 pumps. Further, we determined the impact of the tested compounds on plasma membrane integrity. The ability to cause damage to a plasma membrane depended on the compound, its concentration and the presence of efflux pumps, and corresponded well with the results of growth and survival tests. We also tested possible synergism with three types of known antifungal drugs. Though we did not observe any synergism with azole drugs, styrylpyridinium compounds 5 and 6 together with FK506 demonstrated excellent antifungal properties, whereas compounds 2, 3, 5, and 6 exhibited a significant synergistic effect in combination with terbinafine. Based on our results, derivatives 2 and 6 turned out to be the most promising antifungal drugs. Moreover, compound 6 was not only able to effectively permeabilize the yeast plasma membrane, but also exhibited significant synergism with FK506 and terbinafine. Finally, we also characterized the spectroscopic properties of the tested styrylpyridinium compounds. We measured their absorption and fluorescence spectra, determined their localization in yeast cells and found that their fluorescence characteristics differ from the properties of current commercial vacuolar styrylpyridinium markers and allow multi-color staining. Compounds 1, 3, 7, and 8 were able to accumulate in plasma and vacuolar membranes, and compounds 2, 5, and 6 stained the whole interior of dead cells. In summary, of the eight tested compounds, compound 6 is the most promising antifungal drug, compound 8, due to its minimal toxicity, is the best candidate for a new vacuolar-membrane probe or new benchmark substrate of C. glabrata Cdr pumps, and derivative 5 for a new vital dye.
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Affiliation(s)
- Simona Vaitkienė
- Department of Biochemistry, Faculty of Natural Sciences, Vytautas Magnus University, Kaunas, Lithuania
| | - Rimantas Daugelavičius
- Department of Biochemistry, Faculty of Natural Sciences, Vytautas Magnus University, Kaunas, Lithuania
| | - Hana Sychrová
- Laboratory of Membrane Transport, Division Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Institute of Physiology of the Czech Academy of Sciences, Vestec, Czechia
| | - Marie Kodedová
- Laboratory of Membrane Transport, Division Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Institute of Physiology of the Czech Academy of Sciences, Vestec, Czechia
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6
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Csáky Z, Garaiová M, Kodedová M, Valachovič M, Sychrová H, Hapala I. Squalene lipotoxicity in a lipid droplet‐less yeast mutant is linked to plasma membrane dysfunction. Yeast 2020; 37:45-62. [DOI: 10.1002/yea.3454] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 12/02/2019] [Accepted: 12/07/2019] [Indexed: 12/13/2022] Open
Affiliation(s)
- Zsófia Csáky
- Department of Membrane Biochemistry Institute of Animal Biochemistry and Genetics, Centre of Biosciences of the Slovak Academy of Sciences Bratislava Slovakia
| | - Martina Garaiová
- Department of Membrane Biochemistry Institute of Animal Biochemistry and Genetics, Centre of Biosciences of the Slovak Academy of Sciences Bratislava Slovakia
| | - Marie Kodedová
- Department of Membrane Transport, Division BIOCEV Institute of Physiology of the Czech Academy of Sciences Prague Czech Republic
| | - Martin Valachovič
- Department of Membrane Biochemistry Institute of Animal Biochemistry and Genetics, Centre of Biosciences of the Slovak Academy of Sciences Bratislava Slovakia
| | - Hana Sychrová
- Department of Membrane Transport, Division BIOCEV Institute of Physiology of the Czech Academy of Sciences Prague Czech Republic
| | - Ivan Hapala
- Department of Membrane Biochemistry Institute of Animal Biochemistry and Genetics, Centre of Biosciences of the Slovak Academy of Sciences Bratislava Slovakia
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7
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Kodedová M, Valachovič M, Csáky Z, Sychrová H. Variations in yeast plasma‐membrane lipid composition affect killing activity of three families of insect antifungal peptides. Cell Microbiol 2019; 21:e13093. [DOI: 10.1111/cmi.13093] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 07/25/2019] [Accepted: 07/29/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Marie Kodedová
- Department of Membrane Transport, Division BIOCEVInstitute of Physiology of the Czech Academy of Sciences Prague Czech Republic
| | - Martin Valachovič
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and GeneticsCentre of Biosciences of the Slovak Academy of Sciences Bratislava Slovakia
| | - Zsófia Csáky
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and GeneticsCentre of Biosciences of the Slovak Academy of Sciences Bratislava Slovakia
| | - Hana Sychrová
- Department of Membrane Transport, Division BIOCEVInstitute of Physiology of the Czech Academy of Sciences Prague Czech Republic
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8
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Plasma Membrane Potential of Candida albicans Measured by Di-4-ANEPPS Fluorescence Depends on Growth Phase and Regulatory Factors. Microorganisms 2019; 7:microorganisms7040110. [PMID: 31022974 PMCID: PMC6518178 DOI: 10.3390/microorganisms7040110] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 04/13/2019] [Accepted: 04/22/2019] [Indexed: 11/17/2022] Open
Abstract
The potential of the plasma membrane (Δѱ) regulates the electrochemical potential between the outer and inner sides of cell membranes. The opportunistic fungal pathogen, Candida albicans, regulates the membrane potential in response to environmental conditions, as well as the physiological state of the cell. Here we demonstrate a new method for detection of cell membrane depolarization/permeabilization in C. albicans using the potentiometric zwitterionic dye di-4-ANEPPS. Di-4-ANEPPS measures the changes in the cell Δѱ depending on the phases of growth and external factors regulating Δѱ, such as potassium or calcium chlorides, amiodarone or DM-11 (inhibitor of H+-ATPase). We also demonstrated that di-4-ANEPPS is a good tool for fast measurement of the influence of amphipathic compounds on Δѱ.
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9
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Dual role of iodine, silver, chlorhexidine and octenidine as antimicrobial and antiprotease agents. PLoS One 2019; 14:e0211055. [PMID: 30703114 PMCID: PMC6355201 DOI: 10.1371/journal.pone.0211055] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 01/07/2019] [Indexed: 11/24/2022] Open
Abstract
Objectives The majority of human chronic wounds contain bacterial biofilms, which produce proteases and retard the resolution of inflammation. This in turn leads to elevated patient protease activity. Chronic wounds progressing towards closure show a reduction in proteolytic degradation. Therefore, the modulation of protease activity may lead to the faster healing of chronic wounds. Antimicrobials are used to control biofilm-based infection; however, some of them also exhibit the inhibition of matrix metalloproteinases and bacterial proteases. We investigated the antimicrobial agents used in wound healing for their potential to inhibit bacterial and host proteases relevant to chronic wounds. Methods Using in vitro zymography, we tested the ability of povidone-iodine, silver lactate, chlorhexidine digluconate, and octenidine hydrochloride to inhibit selected human proteases and proteases from Pseudomonas aeruginosa, Staphylococcus aureus, Serratia marcescens, and Serratia liquefaciens. We investigated penetration and skin protease inhibition by means of in situ zymography. Results All the tested antimicrobials inhibited both eukaryotic and prokaryotic proteases in a dose-dependent manner in vitro. The tested compounds were also able to penetrate into skin ex vivo and inhibit the resident proteases. Silver lactate and chlorhexidine digluconate showed an inhibitory effect ex vivo even in partial contact with skin in Franz diffusion cells. Conclusions Our in vitro and ex vivo results suggest that wound healing devices which contain iodine, silver, chlorhexidine, and octenidine may add value to the antibacterial effect and also aid in chronic wound healing. Antiprotease effects should be considered in the design of future antimicrobial wound healing devices.
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Konecna A, Toth Hervay N, Bencova A, Morvova M, Sikurova L, Jancikova I, Gaskova D, Gbelska Y. Erg6 gene is essential for stress adaptation in Kluyveromyces lactis. FEMS Microbiol Lett 2018; 365:5162844. [PMID: 30398655 DOI: 10.1093/femsle/fny265] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 11/05/2018] [Indexed: 01/20/2023] Open
Abstract
We investigated the effect of Kluyveromyces lactis ERG6 gene deletion on plasma membrane function and showed increased susceptibility of mutant cells to salt stress, cationic drugs and weak organic acids. Contrary to Saccharomyces cerevisiae, Klerg6 mutant cells exhibited increased tolerance to tunicamycin. The content of cell wall polysacharides did not significantly vary between wild-type and mutant cells. Although the expression of the NAD+-dependent glycerol 3-phosphate dehydrogenase (KlGPD1) in the Klerg6 mutant cells was only half of that in the parental strain, it was induced in the presence of calcofluor white. Also, cells exposed to this drug accumulated glycerol. The absence of KlErg6p led to plasma membrane hyperpolarization but had no statistically significant influence on the plasma membrane fluidity. We propose that the phenotype of Klerg6 mutant cells to a large extent was a result of the reduced activity of specific plasma membrane proteins that require proper lipid composition for full activity.
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Affiliation(s)
- Alexandra Konecna
- Faculty of Sciences, Department of Microbiology and Virology, Comenius University in Bratislava, Ilkovicova 6, 842 15 Bratislava, Slovakia
| | - Nora Toth Hervay
- Faculty of Sciences, Department of Microbiology and Virology, Comenius University in Bratislava, Ilkovicova 6, 842 15 Bratislava, Slovakia
| | - Alexandra Bencova
- Faculty of Sciences, Department of Microbiology and Virology, Comenius University in Bratislava, Ilkovicova 6, 842 15 Bratislava, Slovakia
| | - Marcela Morvova
- Faculty of Mathematics, Physics and Informatics F1, Comenius University in Bratislava, Mlynska dolina 6280, 842 48 Bratislava, Slovakia
| | - Libusa Sikurova
- Faculty of Mathematics, Physics and Informatics F1, Comenius University in Bratislava, Mlynska dolina 6280, 842 48 Bratislava, Slovakia
| | - Iva Jancikova
- Faculty of Mathematics and Physics, Charles University, Ke Karlovu 2027/3, 121 16 Prague, Czech Republic
| | - Dana Gaskova
- Faculty of Mathematics and Physics, Charles University, Ke Karlovu 2027/3, 121 16 Prague, Czech Republic
| | - Yvetta Gbelska
- Faculty of Sciences, Department of Microbiology and Virology, Comenius University in Bratislava, Ilkovicova 6, 842 15 Bratislava, Slovakia
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Kodedová M, Sychrová H. Synthetic antimicrobial peptides of the halictines family disturb the membrane integrity of Candida cells. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:1851-1858. [DOI: 10.1016/j.bbamem.2017.06.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 05/19/2017] [Accepted: 06/05/2017] [Indexed: 12/31/2022]
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12
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Zahumenský J, Jančíková I, Drietomská A, Švenkrtová A, Hlaváček O, Hendrych T, Plášek J, Sigler K, Gášková D. Yeast Tok1p channel is a major contributor to membrane potential maintenance under chemical stress. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:1974-1985. [PMID: 28669766 DOI: 10.1016/j.bbamem.2017.06.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 06/02/2017] [Accepted: 06/27/2017] [Indexed: 11/17/2022]
Abstract
Tok1p is a highly specific yeast plasma membrane potassium channel with strong outward directionality. Its opening is induced by membrane depolarization. Although the biophysical properties of Tok1p are well-described, its potentially important physiological role is currently largely unexplored. To address this issue, we examined the Tok1p activity following chemically-induced depolarization by measuring changes of plasma membrane potential (ΔΨ) using the diS-C3(3) fluorescence assay in a Tok1p-expressing and a Tok1p-deficient strain. We report that Tok1p channel activity in response to chemical stress does not depend solely on the extent of depolarization, as might have been expected, but may also be negatively influenced by accompanying effects of the used compound. The stressors may interact with the plasma membrane or the channel itself, or cause cytosolic acidification. All of these effects may negatively influence the Tok1p channel opening. While ODDC-induced depolarization exhibits the cleanest Tok1p activation, restoring an astonishing 75% of lost ΔΨ, higher BAC concentrations reduce Tok1p activity, probably because of direct interactions with the channel and/or its lipid microenvironment. This is not only the first study of the physiological role of Tok1p in ΔΨ maintenance under chemical stress, but also the first estimate of the extent of depolarization the channel is able to counterbalance.
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Affiliation(s)
- Jakub Zahumenský
- Charles University, Faculty of Mathematics and Physics, Institute of Physics, Prague 121 16, Czech Republic
| | - Iva Jančíková
- Charles University, Faculty of Mathematics and Physics, Institute of Physics, Prague 121 16, Czech Republic
| | - Andrea Drietomská
- Charles University, Faculty of Mathematics and Physics, Institute of Physics, Prague 121 16, Czech Republic
| | - Andrea Švenkrtová
- Institute of Microbiology, CR Academy of Sciences, Prague 142 20, Czech Republic; Institute of Chemical Technology, Faculty of Food and Biochemical Technology, Prague 166 28, Czech Republic
| | - Otakar Hlaváček
- Institute of Microbiology, CR Academy of Sciences, Prague 142 20, Czech Republic
| | - Tomáš Hendrych
- Department of Genetics and Microbiology, Faculty of Science, Charles University, Prague 128 44, Czech Republic
| | - Jaromír Plášek
- Charles University, Faculty of Mathematics and Physics, Institute of Physics, Prague 121 16, Czech Republic
| | - Karel Sigler
- Institute of Microbiology, CR Academy of Sciences, Prague 142 20, Czech Republic
| | - Dana Gášková
- Charles University, Faculty of Mathematics and Physics, Institute of Physics, Prague 121 16, Czech Republic.
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Kodedová M, Sychrová H. High-throughput fluorescence screening assay for the identification and comparison of antimicrobial peptides’ activity on various yeast species. J Biotechnol 2016; 233:26-33. [DOI: 10.1016/j.jbiotec.2016.06.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 06/06/2016] [Accepted: 06/28/2016] [Indexed: 11/29/2022]
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14
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Profiling of the toxicity mechanisms of coated and uncoated silver nanoparticles to yeast Saccharomyces cerevisiae BY4741 using a set of its 9 single-gene deletion mutants defective in oxidative stress response, cell wall or membrane integrity and endocytosis. Toxicol In Vitro 2016; 35:149-62. [DOI: 10.1016/j.tiv.2016.05.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 05/20/2016] [Accepted: 05/28/2016] [Indexed: 11/23/2022]
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15
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Kodedová M, Sychrová H. Changes in the Sterol Composition of the Plasma Membrane Affect Membrane Potential, Salt Tolerance and the Activity of Multidrug Resistance Pumps in Saccharomyces cerevisiae. PLoS One 2015; 10:e0139306. [PMID: 26418026 PMCID: PMC4587746 DOI: 10.1371/journal.pone.0139306] [Citation(s) in RCA: 117] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 09/11/2015] [Indexed: 11/19/2022] Open
Abstract
We investigated the impact of the deletions of genes from the final steps in the biosynthesis of ergosterol (ERG6, ERG2, ERG3, ERG5, ERG4) on the physiological function of the Saccharomyces cerevisiae plasma membrane by a combination of biological tests and the diS-C3(3) fluorescence assay. Most of the erg mutants were more sensitive than the wild type to salt stress or cationic drugs, their susceptibilities were proportional to the hyperpolarization of their plasma membranes. The different sterol composition of the plasma membrane played an important role in the short-term and long-term processes that accompanied the exposure of erg strains to a hyperosmotic stress (effect on cell size, pH homeostasis and survival of yeasts), as well as in the resistance of cells to antifungal drugs. The pleiotropic drug-sensitive phenotypes of erg strains were, to a large extent, a result of the reduced efficiency of the Pdr5 efflux pump, which was shown to be more sensitive to the sterol content of the plasma membrane than Snq2p. In summary, the erg4Δ and erg6Δ mutants exhibited the most compromised phenotypes. As Erg6p is not involved in the cholesterol biosynthetic pathway, it may become a target for a new generation of antifungal drugs.
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Affiliation(s)
- Marie Kodedová
- Department of Membrane Transport, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic
- * E-mail:
| | - Hana Sychrová
- Department of Membrane Transport, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic
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Salvatico S, Feuillolay C, Mas Y, Verrière F, Roques C. Bactericidal activity of 3 cutaneous/mucosal antiseptic solutions in the presence of interfering substances: Improvement of the NF EN 13727 European Standard? Med Mal Infect 2015; 45:89-94. [PMID: 25779009 DOI: 10.1016/j.medmal.2015.01.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 10/20/2014] [Accepted: 01/14/2015] [Indexed: 11/28/2022]
Abstract
OBJECTIVE There is no standard protocol for the evaluation of antiseptics used for skin and mucous membranes in the presence of interfering substances. Our objective was to suggest trial conditions adapted from the NF EN 13727 standard, for the evaluation of antiseptics used in gynecology and dermatology. METHODS Three antiseptic solutions were tested in vitro: a chlorhexidine-benzalkonium (CB) combination, a hexamidine-chlorhexidine-chlorocresol (HCC) combination, and povidone iodine (P). The adaptation of trial conditions to the standard involved choosing dilutions, solvent, and interfering substances. The activity of solutions was assessed on the recommended strains at concentrations of 97% (pure solution), 50%, and 10% (diluted solution), and 1%. A logarithmic reduction ≥ 5 was expected after 60seconds of contact, to meet requirements of bactericidal activity. RESULTS HCC did not present any bactericidal activity except on P. aeruginosa at a concentration of 97%. P was not bactericidal on E. hirae at any concentration and on S. aureus at 97%. CB had the most homogeneous bactericidal activity with a reduction>5 log on the 4 bacterial strains at concentrations of 97%, 50% and 10%. CONCLUSION Adapting the NF EN 13727 standard allowed assessing the 3 tested solutions: only CB was bactericidal in dirty conditions. This study proved the possibility of validating antiseptic choice in vitro, in current practice conditions, for adjunctive treatment of skin and mucous membranes disorders, primarily of bacterial origin or with a potential of superinfection.
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Affiliation(s)
- S Salvatico
- Fonderephar, 35, chemin des Maraîchers, 31062 Toulouse cedex 9, France
| | - C Feuillolay
- Fonderephar, 35, chemin des Maraîchers, 31062 Toulouse cedex 9, France
| | - Y Mas
- Laboratoire Innotech International, 22, avenue Aristide-Briand, 94110 Arcueil, France
| | - F Verrière
- Laboratoire Innotech International, 22, avenue Aristide-Briand, 94110 Arcueil, France
| | - C Roques
- Fonderephar, 35, chemin des Maraîchers, 31062 Toulouse cedex 9, France; Laboratoire de génie chimique, UMR 5503, UFR pharmacie, université de Toulouse, 35, chemin des Maraîchers, 31062 Toulouse cedex 9, France.
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Herman P, Vecer J, Opekarova M, Vesela P, Jancikova I, Zahumensky J, Malinsky J. Depolarization affects the lateral microdomain structure of yeast plasma membrane. FEBS J 2014; 282:419-34. [DOI: 10.1111/febs.13156] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Accepted: 11/19/2014] [Indexed: 01/28/2023]
Affiliation(s)
- Petr Herman
- Faculty of Mathematics and Physics; Charles University; Prague Czech Republic
| | - Jaroslav Vecer
- Faculty of Mathematics and Physics; Charles University; Prague Czech Republic
| | - Miroslava Opekarova
- Institute of Experimental Medicine; Academy of Sciences of the Czech Republic; Prague Czech Republic
| | - Petra Vesela
- Institute of Experimental Medicine; Academy of Sciences of the Czech Republic; Prague Czech Republic
| | - Iva Jancikova
- Faculty of Mathematics and Physics; Charles University; Prague Czech Republic
| | - Jakub Zahumensky
- Faculty of Mathematics and Physics; Charles University; Prague Czech Republic
| | - Jan Malinsky
- Institute of Experimental Medicine; Academy of Sciences of the Czech Republic; Prague Czech Republic
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Gášková D, Plášek J, Zahumenský J, Benešová I, Buriánková L, Sigler K. Alcohols are inhibitors of Saccharomyces cerevisiae multidrug-resistance pumps Pdr5p and Snq2p. FEMS Yeast Res 2013; 13:782-95. [PMID: 24028576 DOI: 10.1111/1567-1364.12088] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 08/20/2013] [Accepted: 09/01/2013] [Indexed: 11/30/2022] Open
Abstract
The effect of alcohols on cell membrane proteins has originally been assumed to be mediated by their primary action on membrane lipid matrix. Many studies carried out later on both animal and yeast cells have revealed that ethanol and other alcohols inhibit the functions of various membrane channels, receptors and solute transport proteins, and a direct interaction of alcohols with these membrane proteins has been proposed. Using our fluorescence diS-C3 (3) diagnostic assay for multidrug-resistance pump inhibitors in a set of isogenic yeast Pdr5p and Snq2p mutants, we found that n-alcohols (from ethanol to hexanol) variously affect the activity of both pumps. Beginning with propanol, these alcohols have an inhibitory effect that increases with increasing length of the alcohol acyl chain. While ethanol does not exert any inhibitory effect at any of the concentration used (up to 3%), hexanol exerts a strong inhibition at 0.1%. The alcohol-induced inhibition of MDR pumps was detected even in cells whose membrane functional and structural integrity were not compromised. This supports a notion that the inhibitory action does not necessarily involve only changes in the lipid matrix of the membrane but may entail a direct interaction of the alcohols with the pump proteins.
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Affiliation(s)
- Dana Gášková
- Faculty of Mathematics and Physics, Institute of Physics, Charles University, Prague 2, Czech Republic
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