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Wang J, Wang J, Zheng M, Li D. Effects of Different Concentrations of AmB on the Unsaturated Phospholipid-Cholesterol Membrane Using the Langmuir Monolayer and Liposome Models. Molecules 2024; 29:5659. [PMID: 39683817 DOI: 10.3390/molecules29235659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2024] [Revised: 11/18/2024] [Accepted: 11/25/2024] [Indexed: 12/18/2024] Open
Abstract
Amphotericin B (AmB) causes toxicity to the erythrocyte membrane, leading to hemolysis, which limits the clinically effective dose for AmB intravenous therapy in invasive fungal infections. The molecular mechanism by which AmB adheres to the membrane of erythrocytes is the key factor in causing AmB to be toxic to the membrane of erythrocytes, but it is not yet fully understood; the mechanism by which AmB adheres to the liquid microdomains with higher fluidity formed by cholesterol and unsaturated phospholipids remains especially unclear. This study examined the adsorption of AmB at different concentrations, 5, 45, 85, and 125 μg/mL, on unsaturated phospholipid membranes containing 50 mol% cholesterol. The thermodynamic properties and structure of DOPC monolayers and DOPC/cholesterol mixed monolayers at different concentrations of AmB have been investigated using the Langmuir monolayer model and the BAM method. The impact of varying concentrations of AmB on the hydrophilic and hydrophobic domains of the DOPC bilayers and the DOPC/cholesterol mixed bilayers have also been discussed using large unilamellar vesicle liposomes and fluorescence techniques. It is shown that for AmB concentrations greater than 5 μg/mL, with an increase in AmB's concentration, the reorganization time for the DOPC/cholesterol monolayer increases, and the elastic modulus of the DOPC/cholesterol mixed monolayer decreases. In particular, when AmB's concentration is higher than 85 μg/mL, the liquid-condensed phase domains on the DOPC/cholesterol monolayer reduce significantly and the liquid-expanded phase domain enlarges from the BAM images. When the AmB concentration reaches 5 μg/mL, the disorder of the hydrophobic and hydrophilic domains of the DOPC/cholesterol bilayer increases as the AmB concentration increases. The way in which AmB interacts with the DOPC/cholesterol mixed membrane is related to the concentration of AmB. The higher the concentration of AmB, the more likely it is to remove cholesterol from the unsaturated phospholipid membrane. The results are helpful to understand the mechanism of AmB's toxicity to the erythrocyte's membrane, which has a guiding value for seeking ways to reduce the AmB's toxicity.
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Affiliation(s)
- Juan Wang
- Xi'an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi'an 710123, China
| | - Jia Wang
- Shaanxi Engineering Research Center of Controllable Neutron Source, School of Electronic Information, Xijing University, Xi'an 710123, China
| | - Mingyue Zheng
- Xi'an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi'an 710123, China
| | - Da Li
- Xi'an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi'an 710123, China
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Place AR, Ramos-Franco J, Waters AL, Peng J, Hamann MT. Sterolysin from a 1950s culture of Karlodinium veneficum (aka Gymnodinium veneficum Ballantine) forms lethal sterol dependent membrane pores. Sci Rep 2024; 14:17998. [PMID: 39097621 PMCID: PMC11297910 DOI: 10.1038/s41598-024-68669-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Accepted: 07/26/2024] [Indexed: 08/05/2024] Open
Abstract
In 1957 Abbott and Ballantine described a highly toxic activity from a dinoflagellate isolated from the English Channel in 1949 by Mary Park. From a culture maintained at Plymouth Laboratory since 1950, we have been able to isolate two toxic molecules (abbotoxin and 59-E-Chloro-abbotoxin), determine the planar structures by analysis of HRMS and 1D and 2D NMR spectra, and found them to be karlotoxin (KmTx) congeners. Both toxins kill larval zebrafish with symptoms identical to those described by Abbot and Ballantine for gobies (Gobius virescens). Using surface plasma resonance the sterol binding specificity of karlotoxins is shown to require desmethyl sterols. Our results with black lipid membranes indicate that karlotoxin forms large-conductance channels in the lipid membrane, which are characterized by large ionic conductance, poor ionic selectivity, and a complex gating behavior that exhibits strong voltage dependence and multiple gating patterns. In addition, we show that KmTx 2 pore formation is a highly targeted mechanism involving sterol-specificity. This is the first report of the functional properties of the membrane pores formed by karlotoxins and is consistent with the initial observations of Abbott and Ballantine from 1957.
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Affiliation(s)
- Allen R Place
- Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Sciences, Suite 236 Rita Rossi Colwell Center, Baltimore, MD, 21202, USA.
| | - Josefina Ramos-Franco
- Department of Physiology and Biophysics, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Amanda L Waters
- Department of Chemistry, University of Central Oklahoma, Edmond, OK, 73034, USA
| | - Jiangnan Peng
- Department of Chemistry, Morgan State University, Baltimore, MD, 21251, USA
- COP Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC, 29425-5700, USA
| | - Mark T Hamann
- Department of Chemistry, Morgan State University, Baltimore, MD, 21251, USA
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3
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Rammali S, Ciobică A, El Aalaoui M, Rahim A, Kamal FZ, Dari K, Khattabi A, Romila L, Novac B, Petroaie A, Bencharki B. Exploring the antimicrobial and antioxidant properties of Lentzea flaviverrucosa strain E25-2 isolated from Moroccan forest soil. Front Microbiol 2024; 15:1429035. [PMID: 39104582 PMCID: PMC11298423 DOI: 10.3389/fmicb.2024.1429035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Accepted: 07/05/2024] [Indexed: 08/07/2024] Open
Abstract
The alarming rise in antimicrobial resistance (AMR) has created a significant public health challenge, necessitating the discovery of new therapeutic agents to combat infectious diseases and oxidative stress-related disorders. The Lentzea flaviverrucosa strain E25-2, isolated from Moroccan forest soil, represents a potential avenue for such research. This study aimed to identify the isolate E25-2, obtained from soil in a cold Moroccan ecosystem, and further investigate its antimicrobial and antioxidant activities. Phylogenetic analysis based on 16S rRNA gene sequences revealed the strain's classification within the Lentzea genus, with a sequence closely resembling that of Lentzea flaviverrucosa AS4.0578 (96.10% similarity). Antimicrobial activity in solid media showed moderate to strong activity against Staphylococcus aureus ATCC 25923, Bacillus cereus strain ATCC 14579, Escherichia coli strain ATCC 25922, Candida albicans strain ATCC 60193 and 4 phytopathogenic fungi. In addition, ethyl acetate extract of this isolate demonstrated potent antimicrobial activity against 7 clinically multi-drug resistant bacteria. Furthermore, it demonstrated antioxidant activity against 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) free radicals, as well as a significant increase in ferric reducing antioxidant power. A significant positive correlation was observed between antioxidant activities and total content of phenolic compounds (p < 0.0001), along with flavonoids (p < 0.0001). Furthermore, gas chromatography-mass spectrometry (GC-MS) analysis revealed the presence of amines, hydroxyl groups, pyridopyrazinone rings, esters and pyrrolopyrazines. The Lentzea genus could offer promising prospects in the fight against antibiotic resistance and in the prevention against oxidative stress related diseases.
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Affiliation(s)
- Said Rammali
- Laboratory of Agro-Alimentary and Health, Faculty of Sciences and Techniques, Hassan First University of Settat, Settat, Morocco
| | - Alin Ciobică
- Department of Biology, Faculty of Biology, Alexandru Ioan Cuza University of Iasi, Iași, Romania
- Center of Biomedical Research, Romanian Academy, Iasi Branch, Iași, Romania
- Academy of Romanian Scientists, Bucharest, Romania
- CENEMED Platform for Interdisciplinary Research, “Grigore T. Popa” University of Medicine and Pharmacy of Iasi, Iasi, Romania
| | | | - Abdellatif Rahim
- Laboratory of Biochemistry, Neurosciences, Natural Resources and Environment, Faculty of Sciences and Techniques, Hassan First University of Settat, Settat, Morocco
| | - Fatima Zahra Kamal
- Higher Institute of Nursing Professions and Health Technical (ISPITS), Marrakech, Morocco
- Laboratory of Physical Chemistry of Processes and Materials, Faculty of Sciences and Techniques, Hassan First University, Settat, Morocco
| | - Khadija Dari
- Laboratory of Agro-Alimentary and Health, Faculty of Sciences and Techniques, Hassan First University of Settat, Settat, Morocco
| | - Abdelkrim Khattabi
- Laboratory of Agro-Alimentary and Health, Faculty of Sciences and Techniques, Hassan First University of Settat, Settat, Morocco
| | - Laura Romila
- Department of Chemistry, “Ioan Haulica” Institute, Apollonia University, Iași, Romania
| | - Bogdan Novac
- Urology Department, Grigore T. Popa University of Medicine and Pharmacy, Iași, Romania
| | - Antoneta Petroaie
- Family Medicine Department, Grigore T. Popa University of Medicine and Pharmacy, Iași, Romania
| | - Bouchaib Bencharki
- Laboratory of Agro-Alimentary and Health, Faculty of Sciences and Techniques, Hassan First University of Settat, Settat, Morocco
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Rammali S, Rahim A, El Aalaoui M, Bencharki B, Dari K, Habach A, Abdeslam L, Khattabi A. Antimicrobial potential of Streptomyces coeruleofuscus SCJ isolated from microbiologically unexplored garden soil in Northwest Morocco. Sci Rep 2024; 14:3359. [PMID: 38336871 PMCID: PMC10858231 DOI: 10.1038/s41598-024-53801-x] [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: 09/01/2023] [Accepted: 02/05/2024] [Indexed: 02/12/2024] Open
Abstract
Research on microorganisms in various biotopes is required to identify new, natural potent molecules. These molecules are essential to control the development of multi-drug resistance (MDR). In the present study, a Streptomyces sp., namely SCJ, was isolated from a soil sample collected from a Moroccan garden. SCJ isolate was identified on the basis of a polyphasic approach, which included cultural, micro-morphological, biochemical, and physiological characteristics. The sequence of the 16S rRNA gene of the SCJ strain showed 99.78% similarity to strains of Streptomyces coeruleofuscus YR-T (KY753282.1). The preliminary screening indicated that the SCJ isolate exhibited activity against Candida albicans ATCC 60,193, Escherichia coli ATCC 25,922, Staphylococcus aureus CECT 976, Staphylococcus aureus ATCC 25,923, Bacillus cereus ATCC 14,579, Pseudomonas aeruginosa ATCC 27,853, as well as various other clinical MDR bacteria and five phytopathogenic fungi. The ethyl acetate extract of the isolated strain demonstrated highly significant (p < 0.05) antimicrobial activity against multi-resistant bacteria and phytopathogenic fungi. The absorption spectral analysis of the ethyl acetate extract of the SCJ isolate obtained showed no absorption peaks characteristic of polyene molecules. Moreover, no hemolytic activity against erythrocytes was observed in this extract. GC-MS analysis of the ethyl acetate extract of the SCJ isolate revealed the presence of 9 volatile compounds including 3,5-Dimethylpyrazole, and pyrrolizidine derivatives (Pyrrolo[1,2-a]pyrazine 1,4-dione, hexahydro-3-(2-methylpropyl)), which could potentially explain the antimicrobial activity demonstrated in this study.
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Affiliation(s)
- Said Rammali
- Laboratory of Agro-Alimentary and Health, Faculty of Sciences and Techniques, Hassan First University of Settat, B.P. 539, 26000, Settat, Morocco.
| | - Abdellatif Rahim
- Laboratory of Biochemistry, Neurosciences, Natural Ressources and Environment, Faculty of Sciences and Techniques, Hassan First University of Settat, B.P. 539, 26000, Settat, Morocco
| | - Mohamed El Aalaoui
- Regional Center of Agronomic Research of Settat, Tertiary Road 1406, At 5 Km From Settat, 26400, Settat, Morocco
| | - Bouchaib Bencharki
- Laboratory of Agro-Alimentary and Health, Faculty of Sciences and Techniques, Hassan First University of Settat, B.P. 539, 26000, Settat, Morocco
| | - Khadija Dari
- Laboratory of Agro-Alimentary and Health, Faculty of Sciences and Techniques, Hassan First University of Settat, B.P. 539, 26000, Settat, Morocco
| | - Aicha Habach
- Biotechnology Unit, National Institute of Agronomic Research of Rabat, Av. Annasr, 10000, Rabat, Morocco
| | - Lamiri Abdeslam
- Applied Chemistry & Environment Laboratory, Faculty of Sciences and Techniques, Hassan First University of Settat, B.P. 539, 26000, Settat, Morocco
| | - Abdelkrim Khattabi
- Laboratory of Agro-Alimentary and Health, Faculty of Sciences and Techniques, Hassan First University of Settat, B.P. 539, 26000, Settat, Morocco
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5
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Rammali S, Hilali L, Dari K, Bencharki B, Rahim A, Timinouni M, Gaboune F, El Aalaoui M, Khattabi A. Antimicrobial and antioxidant activities of Streptomyces species from soils of three different cold sites in the Fez-Meknes region Morocco. Sci Rep 2022; 12:17233. [PMID: 36241756 PMCID: PMC9568536 DOI: 10.1038/s41598-022-21644-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 09/29/2022] [Indexed: 01/06/2023] Open
Abstract
The increasing demand for new bioactive compounds to combat the evolution of multi-drug resistance (MDR) requires research on microorganisms in different environments in order to identify new potent molecules. In this study, initial screening regarding the antimicrobial activity of 44 Actinomycetes isolates isolated from three soil samples from three different extremely cold sites in Morocco was carried out. Primary and secondary screening were performed against Candida albicans ATCC 60,193, Escherichia coli ATCC 25,922, Staphylococcus aureus ATCC 25,923, Bacillus cereus ATCC 14,579, other clinical MDR bacteria, and thirteen phytopathogenic fungi. Based on the results obtained, 11 active isolates were selected for further study. The 11microbial isolates were identified based on morphological and biochemical characters and their molecular identification was performed using 16S rRNA sequence homology. The UV-visible analysis of dichloromethane extracts of the five Streptomyces sp. Strains that showed high antimicrobial and antioxidant (ABTS 35.8% and DPPH 25.6%) activities revealed the absence of polyene molecules. GC-MS analysis of the dichloromethane extract of E23-4 as the most active strain revealed the presence of 21 volatile compounds including Pyrrolopyrazine (98%) and Benzeneacetic acid (90%). In conclusion, we studied the isolation of new Streptomyces strains to produce new compounds with antimicrobial and antioxidant activities in a cold and microbiologically unexplored region of Morocco. Furthermore, this study has demonstrated a significant (P < 0.0001) positive correlation between total phenolic and flavonoid contents and antioxidant capacity, paving the way for the further characterization of these Streptomyces sp. isolates for their optimal use for anticancer, antioxidant, and antimicrobial purposes.
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Affiliation(s)
- Said Rammali
- Agri-food and Health Laboratory, Faculty of Sciences and Techniques, Hassan First University of Settat, Km 3, B.P. : 577 Route de Casablanca, 26000, Settat, Morocco.
| | - Lahoucine Hilali
- Agri-food and Health Laboratory, Faculty of Sciences and Techniques, Hassan First University of Settat, Km 3, B.P. : 577 Route de Casablanca, 26000, Settat, Morocco
| | - Khadija Dari
- Agri-food and Health Laboratory, Faculty of Sciences and Techniques, Hassan First University of Settat, Km 3, B.P. : 577 Route de Casablanca, 26000, Settat, Morocco
| | - Bouchaib Bencharki
- Agri-food and Health Laboratory, Faculty of Sciences and Techniques, Hassan First University of Settat, Km 3, B.P. : 577 Route de Casablanca, 26000, Settat, Morocco
| | - Abdellatif Rahim
- Laboratory of Biochemistry, Neurosciences, Natural Ressources and Environment, Faculty of Sciences and Techniques, Hassan First University of Settat, Km 3, B.P. : 577 Route de Casablanca, 26000, Settat, Morocco, Settat
| | - Mohammed Timinouni
- Molecular Bacteriology Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco, Place Louis Pasteur, 20100
| | - Fatima Gaboune
- Biotechnology Unit, National Institute of Agronomic Research of Rabat, Rabat, Morocco, Av. Annasr, Rabat, 10000
| | - Mohamed El Aalaoui
- Department of plant protection, Regional Center of Agronomic Research of Settat, Tertiary Road 1406, At 5 Km from Settat, 26400, Settat, Morocco, Settat
| | - Abdelkrim Khattabi
- Agri-food and Health Laboratory, Faculty of Sciences and Techniques, Hassan First University of Settat, Km 3, B.P. : 577 Route de Casablanca, 26000, Settat, Morocco
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6
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Haro-Reyes T, Díaz-Peralta L, Galván-Hernández A, Rodríguez-López A, Rodríguez-Fragoso L, Ortega-Blake I. Polyene Antibiotics Physical Chemistry and Their Effect on Lipid Membranes; Impacting Biological Processes and Medical Applications. MEMBRANES 2022; 12:681. [PMID: 35877884 PMCID: PMC9316096 DOI: 10.3390/membranes12070681] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 06/21/2022] [Accepted: 06/23/2022] [Indexed: 01/27/2023]
Abstract
This review examined a collection of studies regarding the molecular properties of some polyene antibiotic molecules as well as their properties in solution and in particular environmental conditions. We also looked into the proposed mechanism of action of polyenes, where membrane properties play a crucial role. Given the interest in polyene antibiotics as therapeutic agents, we looked into alternative ways of reducing their collateral toxicity, including semi-synthesis of derivatives and new formulations. We follow with studies on the role of membrane structure and, finally, recent developments regarding the most important clinical applications of these compounds.
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Affiliation(s)
- Tammy Haro-Reyes
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Col. Chamilpa, Cuernavaca 62210, Morelos, Mexico; (T.H.-R.); (L.D.-P.); (A.G.-H.)
| | - Lucero Díaz-Peralta
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Col. Chamilpa, Cuernavaca 62210, Morelos, Mexico; (T.H.-R.); (L.D.-P.); (A.G.-H.)
| | - Arturo Galván-Hernández
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Col. Chamilpa, Cuernavaca 62210, Morelos, Mexico; (T.H.-R.); (L.D.-P.); (A.G.-H.)
| | - Anahi Rodríguez-López
- Facultad de Farmacia, Universidad Autónoma del Estado de Morelos, Cuernavaca 62210, Morelos, Mexico; (A.R.-L.); (L.R.-F.)
| | - Lourdes Rodríguez-Fragoso
- Facultad de Farmacia, Universidad Autónoma del Estado de Morelos, Cuernavaca 62210, Morelos, Mexico; (A.R.-L.); (L.R.-F.)
| | - Iván Ortega-Blake
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Col. Chamilpa, Cuernavaca 62210, Morelos, Mexico; (T.H.-R.); (L.D.-P.); (A.G.-H.)
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7
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Grudzinski W, Sagan J, Welc R, Luchowski R, Gruszecki WI. Molecular organization, localization and orientation of antifungal antibiotic amphotericin B in a single lipid bilayer. Sci Rep 2016; 6:32780. [PMID: 27620838 PMCID: PMC5020354 DOI: 10.1038/srep32780] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 08/15/2016] [Indexed: 01/29/2023] Open
Abstract
Amphotericin B is a popular antifungal antibiotic, a gold standard in treatment of systemic mycotic infections, due to its high effectiveness. On the other hand, applicability of the drug is limited by its considerable toxicity to patients. Biomembranes are a primary target of physiological activity of amphotericin B and both the pharmacologically desired and toxic side effects of the drug relay on its molecular organization in the lipid phase. In the present work, molecular organization, localization and orientation of amphotericin B, in a single lipid bilayer system, was analysed simultaneously, thanks to application of a confocal fluorescence lifetime imaging microscopy of giant unilamellar vesicles. The results show that the presence of sterols, in the lipid phase, promotes formation of supramolecular structures of amphotericin B and their penetration into the membrane hydrophobic core. The fact that such an effect is substantially less pronounced in the case of cholesterol than ergosterol, the sterol of fungal membranes, provides molecular insight into the selectivity of the drug.
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Affiliation(s)
- Wojciech Grudzinski
- Department of Biophysics, Institute of Physics, Maria Curie-Skłodowska University, Lublin, Poland
| | - Joanna Sagan
- Department of Biophysics, Institute of Physics, Maria Curie-Skłodowska University, Lublin, Poland
| | - Renata Welc
- Department of Biophysics, Institute of Physics, Maria Curie-Skłodowska University, Lublin, Poland
| | - Rafal Luchowski
- Department of Biophysics, Institute of Physics, Maria Curie-Skłodowska University, Lublin, Poland
| | - Wieslaw I Gruszecki
- Department of Biophysics, Institute of Physics, Maria Curie-Skłodowska University, Lublin, Poland
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8
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Neumann A, Wieczor M, Zielinska J, Baginski M, Czub J. Membrane Sterols Modulate the Binding Mode of Amphotericin B without Affecting Its Affinity for a Lipid Bilayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3452-3461. [PMID: 27007267 DOI: 10.1021/acs.langmuir.5b04433] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Membrane-active antibiotics are known to selectively target certain pathogens based on cell membrane properties, such as fluidity, lipid ordering, and phase behavior. These are in turn modulated by the composition of a lipid bilayer and in particular by the presence and type of membrane sterols. Amphotericin B (AmB), the golden standard of antifungal treatment, exhibits higher activity toward ergosterol-rich fungal membranes, which permits its use against systemic mycoses; however, the selectivity for fungal membranes is far from satisfactory leading to severe side effects. Despite decades of research, no consensus has emerged on the origin of AmB specificity for fungal cells and its actual mode of action at the molecular level. Previously, it has been proposed that the specific action of AmB is related to differences in its affinity for membranes of different composition. In this work, we investigate this relationship by employing molecular dynamics simulations to compare the free energy of insertion of AmB into three types of membranes: a pure DMPC bilayer and DMPC bilayers containing 30% of cholesterol or ergosterol. We analyze the orientation of AmB molecules within the bilayer in order to unambiguously establish their membrane binding mode and relate the orientational freedom to the sterol-dependent tightness of lipid packing. Our results strongly indicate that the membrane insertion of AmB proceeds virtually to completion independent of membrane type, and hence the higher toxicity against fungal membranes may rather result from differences in subsequent oligomerization in the membrane and assembly of monomers into functional transmembrane pores. In particular, the latter could be facilitated by sterol-induced ordering of AmB molecules along the membrane normal, revealed by our free energy profiles. Moreover--in contrast to certain claims--we find no stable binding mode corresponding to the horizontal adsorption of AmB on the membrane surface.
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Affiliation(s)
| | | | - Joanna Zielinska
- Department of Pharmaceutical Chemistry, Medical University of Gdansk , Gdansk, Poland
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9
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Boukari K, Balme S, Janot JM, Picaud F. Towards New Insights in the Sterol/Amphotericin Nanochannels Formation: A Molecular Dynamic Simulation Study. J Membr Biol 2015; 249:261-70. [PMID: 26700625 DOI: 10.1007/s00232-015-9865-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 12/11/2015] [Indexed: 10/22/2022]
Abstract
Amphotericin B (AmB) is a well-known polyene which self-organizes into membrane cell in order to cause the cell death. Its specific action towards fungal cell is not fully understood but was proved to become from sterol composition. The mechanism was shown experimentally to require the formation of stable sterol/polyene couples which could then organize in a nanochannel. This would allow the leakage of ions responsible for the death of fungal cells, only. In this present study, we investigate the arrangement of AmB/sterols in biological membrane using molecular dynamic simulations in order to understand the role of the sterol structure on the antifungal action of the polyene. We show in particular that the nanochannels tend to close up when cell was composed with cholesterol (animal cell) due to strong interaction between amphotericin and sterol. On the other side, with ergosterol (fungal cell) the largest interactions between amphotericin and lipid membrane lead to the appearance of large hole that could favor the important leakage of ions and thus, the fungal cell death. This work appears as a good complement in the extensive studies linked to the understanding of the antifungal molecules in membrane cells.
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Affiliation(s)
- Khaoula Boukari
- Laboratoire de Nanomédecine, Imagerie et Thérapeutique, EA 4662, Université Franche-Comté, Centre Hospitalier Universitaire de Besançon, UFR ST, 16 route de Gray, 25030, Besançon Cedex, France
| | - Sébastien Balme
- Institut Européen des Membranes, UMR5635 CNRS-UM2-ENSCM, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France
| | - Jean-Marc Janot
- Institut Européen des Membranes, UMR5635 CNRS-UM2-ENSCM, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France
| | - Fabien Picaud
- Laboratoire de Nanomédecine, Imagerie et Thérapeutique, EA 4662, Université Franche-Comté, Centre Hospitalier Universitaire de Besançon, UFR ST, 16 route de Gray, 25030, Besançon Cedex, France.
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10
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Kamiński DM. Recent progress in the study of the interactions of amphotericin B with cholesterol and ergosterol in lipid environments. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2014; 43:453-67. [PMID: 25173562 PMCID: PMC4212203 DOI: 10.1007/s00249-014-0983-8] [Citation(s) in RCA: 124] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 08/08/2014] [Accepted: 08/19/2014] [Indexed: 11/12/2022]
Abstract
In the past decade substantial progress has been made in understanding the organization and biological activity of amphotericin B (AmB) in the presence of sterols in lipid environments. This review concentrates mainly on interactions of AmB with lipids and sterols, AmB channel formation in membranes, AmB aggregation, AmB modifications important for understanding its biological activity, and AmB models explaining its mechanism of action. Most of the reviewed studies concern monolayers at the water–gas interface, monolayers deposited on a solid substrate by use of the Langmuir–Blodgett technique, micelles, vesicles, and multi-bilayers. Liposomal AmB formulations and drug delivery are intentionally omitted, because several reviews dedicated to this subject are already available.
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Affiliation(s)
- Daniel Michał Kamiński
- Department of Chemistry, University of Life Sciences in Lublin, Akademicka 15, 20-950, Lublin, Poland,
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11
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Amphotericin B ion channel mimetic sensor: A new type of potassium-selective sensor based on electrode-supported hybrid bilayer membranes. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.03.096] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Wasko P, Luchowski R, Tutaj K, Grudzinski W, Adamkiewicz P, Gruszecki WI. Toward Understanding of Toxic Side Effects of a Polyene Antibiotic Amphotericin B: Fluorescence Spectroscopy Reveals Widespread Formation of the Specific Supramolecular Structures of the Drug. Mol Pharm 2012; 9:1511-20. [DOI: 10.1021/mp300143n] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Piotr Wasko
- Department of Biophysics,
Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin,
Poland
| | - Rafal Luchowski
- Department of Biophysics,
Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin,
Poland
| | - Krzysztof Tutaj
- Department of Biophysics,
Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin,
Poland
| | - Wojciech Grudzinski
- Department of Biophysics,
Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin,
Poland
| | - Przemyslaw Adamkiewicz
- Department of Biophysics,
Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin,
Poland
| | - Wieslaw I. Gruszecki
- Department of Biophysics,
Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin,
Poland
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Zourob M, Elwary S, Turner A. Acoustic Wave (TSM) Biosensors: Weighing Bacteria. PRINCIPLES OF BACTERIAL DETECTION: BIOSENSORS, RECOGNITION RECEPTORS AND MICROSYSTEMS 2008. [PMCID: PMC7121835 DOI: 10.1007/978-0-387-75113-9_12] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
This chapter is focused on the development and use of acoustic wave biosensor platforms for the detection of bacteria, specifically those based on the thickness shear mode (TSM) resonator. We demonstrated the mechanical and electrical implications of bacterial positioning at the solid-liquid interface of a TSM biosensor and presented a model of the TSM with bacteria attached operating as coupled oscillators. The experiments and model provide an understanding of the nature of the signals produced by acoustic wave devices when they are used for testing bacteria. The paradox of “negative mass” could be a real threat to the interpretation of experimental results related to the detection of bacteria. The knowledge of the true nature of “negative mass” linked to the strength of bacteria attachment will contribute significantly to our understanding of the results of “weighing bacteria.” The results of this work can be used for bacterial detection and control of processes of bacterial settlement, bacterial colonization, biofilm formation, and bacterial infection in which bacterial attachment plays a role.
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Affiliation(s)
| | - Souna Elwary
- Consultant to Biophage Pharma Inc, Montreal, Canada
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