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Hammoudi Halat D, Younes S, Mourad N, Rahal M. Allylamines, Benzylamines, and Fungal Cell Permeability: A Review of Mechanistic Effects and Usefulness against Fungal Pathogens. MEMBRANES 2022; 12:membranes12121171. [PMID: 36557078 PMCID: PMC9781035 DOI: 10.3390/membranes12121171] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 11/14/2022] [Accepted: 11/16/2022] [Indexed: 05/30/2023]
Abstract
Allylamines, naftifine and terbinafine, and the benzylamine, butenafine, are antifungal agents with activity on the fungal cell membrane. These synthetic compounds specifically inhibit squalene epoxidase, a key enzyme in fungal sterol biosynthesis. This results in a deficiency in ergosterol, a major fungal membrane sterol that regulates membrane fluidity, biogenesis, and functions, and whose damage results in increased membrane permeability and leakage of cellular components, ultimately leading to fungal cell death. With the fungal cell membrane being predominantly made up of lipids including sterols, these lipids have a vital role in the pathogenesis of fungal infections and the identification of improved therapies. This review will focus on the fungal cell membrane structure, activity of allylamines and benzylamines, and the mechanistic damage they cause to the membrane. Furthermore, pharmaceutical preparations and clinical uses of these drugs, mainly in dermatophyte infections, will be reviewed.
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Affiliation(s)
- Dalal Hammoudi Halat
- Department of Pharmaceutical Sciences, School of Pharmacy, Lebanese International University, Bekaa 146404, Lebanon
| | - Samar Younes
- Department of Biomedical Sciences, School of Pharmacy, Lebanese International University, Bekaa 146404, Lebanon
| | - Nisreen Mourad
- Department of Pharmaceutical Sciences, School of Pharmacy, Lebanese International University, Bekaa 146404, Lebanon
| | - Mohamad Rahal
- Department of Pharmaceutical Sciences, School of Pharmacy, Lebanese International University, Bekaa 146404, Lebanon
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Renault-Mahieux M, Mignet N, Seguin J, Alhareth K, Paul M, Andrieux K. Co-encapsulation of flavonoids with anti-cancer drugs: a challenge ahead. Int J Pharm 2022; 623:121942. [PMID: 35728717 DOI: 10.1016/j.ijpharm.2022.121942] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 05/24/2022] [Accepted: 06/15/2022] [Indexed: 11/29/2022]
Abstract
Flavonoids have been considered as promising molecules for cancer treatment due to their pleiotropic properties such as anti-carcinogenic, anti-angiogenic or efflux proteins inhibition. However, due to their lipophilic properties and their chemical instability, vectorization seems compulsory to administer flavonoids. Flavonoids have been co-encapsulated with other anti-cancer agents in a broad range of nanocarriers aiming to i) achieve a synergistic/additive effect at the tumor site, ii) delay drug resistance apparition by combining agents with different action mechanisms or iii) administer a lower dose of the anti-cancer drug, reducing its toxicity. However, co-encapsulation could lead to a change in the nanoparticles' diameter and drug-loading, as well as a decrease in their stability during storage. The preparation process should also take into accounts the physico-chemical properties of both the flavonoid and the anti-cancer agent. Moreover, the co-encapsulation could affect the release and activity of each drug. This review aims to study the formulation, preparation and characterization strategies of these co-loaded nanomedicines, as well as their stability. The in vitro assays to predict the nanomedicines' behavior in biological fluids, as well as their in vivo efficacy, are also discussed. A special focus concerns the evaluation of their synergistic effect on tumor treatment.
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Affiliation(s)
- Morgane Renault-Mahieux
- Université Paris Cité, CNRS, Inserm, UTCBS, F-75006 Paris, France; Pharmacy Department, AP-HP, Henri Mondor Hospital Group, F-94010, France.
| | - Nathalie Mignet
- Université Paris Cité, CNRS, Inserm, UTCBS, F-75006 Paris, France.
| | - Johanne Seguin
- Université Paris Cité, CNRS, Inserm, UTCBS, F-75006 Paris, France.
| | - Khair Alhareth
- Université Paris Cité, CNRS, Inserm, UTCBS, F-75006 Paris, France.
| | - Muriel Paul
- Pharmacy Department, AP-HP, Henri Mondor Hospital Group, F-94010, France.
| | - Karine Andrieux
- Université Paris Cité, CNRS, Inserm, UTCBS, F-75006 Paris, France.
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Porras AMG, Terra BS, Braga TC, Magalhães TFF, Martins CVB, da Silva DL, Baltazar LM, Gouveia LF, de Freitas GJC, Santos DA, Resende-Stoianoff MA, Fuchs BB, Mylonakis E, de Freitas RP, de Fátima Â. Butenafine and analogues: An expeditious synthesis and cytotoxicity and antifungal activities. J Adv Res 2018; 14:81-91. [PMID: 30009053 PMCID: PMC6041462 DOI: 10.1016/j.jare.2018.06.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 06/19/2018] [Accepted: 06/20/2018] [Indexed: 12/29/2022] Open
Abstract
The incidence of fungal infections is considered a serious public health problem worldwide. The limited number of antimycotic drugs available to treat human and animal mycosis, the undesirable side effects and toxicities of the currently available drugs, and the emergence of fungal resistance emphasizes the urgent need for more effective antimycotic medicines. In this paper, we describe a rapid, simple, and efficient synthetic route for preparation of the antifungal agent butenafine on a multigram scale. This novel synthetic route also facilitated the preparation of 17 butenafine analogues using Schiff bases as precursors in three steps or less. All the synthesized compounds were evaluated against the yeast, Cryptococcus neoformans/C. gattii species complexes and the filamentous fungi Trichophyton rubrum and Microsporum gypseum. Amine 4bd, a demethylated analogue of butenafine, and its corresponding hydrochloride salt showed low toxicity in vitro and in vivo while maintaining inhibitory activity against filamentous fungi.
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Affiliation(s)
| | - Bruna Silva Terra
- Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Taniris Cafiero Braga
- Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Thais Furtado Ferreira Magalhães
- Departamento de Microbiologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI, USA
| | - Cleide Viviane Buzanello Martins
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI, USA
- Centro de Engenharias e Ciências Exatas, Universidade Estadual do Oeste do Paraná, Toledo, PR, Brazil
| | - Danielle Letícia da Silva
- Departamento de Microbiologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI, USA
| | - Ludmila Matos Baltazar
- Departamento de Microbiologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | | | | | - Daniel Assis Santos
- Departamento de Microbiologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | | | - Beth Burgwyn Fuchs
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI, USA
| | - Eleftherios Mylonakis
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI, USA
| | | | - Ângelo de Fátima
- Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
- Corresponding author.
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Theorell J, Gustavsson AL, Tesi B, Sigmundsson K, Ljunggren HG, Lundbäck T, Bryceson YT. Immunomodulatory activity of commonly used drugs on Fc-receptor-mediated human natural killer cell activation. Cancer Immunol Immunother 2014; 63:627-41. [PMID: 24682538 PMCID: PMC11028594 DOI: 10.1007/s00262-014-1539-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 03/13/2014] [Indexed: 10/25/2022]
Abstract
Natural killer (NK) cells mediate defense against neoplastic as well as infected cells. Yet, how their effector functions are affected by the large variety of pharmacological compounds commonly in use has not been investigated systematically. Here, we screened 1,200 in-use or previously approved drugs for their biological effect on freshly isolated human peripheral blood-derived NK cells. Mimicking antibody-dependent cellular cytotoxicity (ADCC), known to be important in antibody-based immunotherapies against, e.g., human malignancies, the cells were stimulated by Fc-receptor (CD16) engagement. Cellular responses were assessed by flow cytometry. Fifty-six compounds that significantly inhibited and twelve that enhanced one or more of the readouts of adhesion, exocytosis, and chemokine production were identified and confirmed as hits. Among the confirmed inhibitors, 80 % could be assigned to one of seven major pharmacological classes. These classes were β2-adrenergic agonists, prostaglandins, phosphodiesterase-4 inhibitors, Ca(2+)-channel blockers, histamine H1-receptor antagonists, serotonin/dopamine receptor antagonists, and topoisomerase inhibitors that displayed distinct inhibitory patterns on NK cell responses. Among observed enhancers, interestingly, two ergosterol synthesis inhibitors were identified that specifically promoted exocytosis. In summary, these results provide a comprehensive knowledge base of the effect known drugs have on NK cells. More specifically, they provide an overview of drugs that may modulate NK cell-mediated ADCC in the context of clinical immunotherapies.
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Affiliation(s)
- Jakob Theorell
- Department of Medicine, Centre for Infectious Medicine, F59, Karolinska Institutet, Karolinska University Hospital Huddinge, 141 86 Stockholm, Sweden
| | - Anna-Lena Gustavsson
- Chemical Biology Consortium Sweden, Science for Life Laboratory, Division of Translational Medicine, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Bianca Tesi
- Childhood Cancer Research Unit, Department of Women’s and Children’s Health, Karolinska Institutet, Karolinska University Hospital Solna, Stockholm, Sweden
- Clinical Genetics Unit, Department of Molecular Medicine and Surgery, Center for Molecular Medicine, Karolinska Institutet, Karolinska University Hospital Solna, Stockholm, Sweden
| | - Kristmundur Sigmundsson
- Chemical Biology Consortium Sweden, Science for Life Laboratory, Division of Translational Medicine, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Hans-Gustaf Ljunggren
- Department of Medicine, Centre for Infectious Medicine, F59, Karolinska Institutet, Karolinska University Hospital Huddinge, 141 86 Stockholm, Sweden
| | - Thomas Lundbäck
- Chemical Biology Consortium Sweden, Science for Life Laboratory, Division of Translational Medicine, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Yenan T. Bryceson
- Department of Medicine, Centre for Infectious Medicine, F59, Karolinska Institutet, Karolinska University Hospital Huddinge, 141 86 Stockholm, Sweden
- Broegelmann Research Laboratory, Institute of Clinical Sciences, University of Bergen, Bergen, Norway
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5
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Li L, Shi Y, Su G, Le G. Selectivity for and destruction of Salmonella typhimurium via a membrane damage mechanism of a cell-penetrating peptide ppTG20 analogue. Int J Antimicrob Agents 2012; 40:337-43. [PMID: 22819152 DOI: 10.1016/j.ijantimicag.2012.05.026] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2012] [Revised: 04/18/2012] [Accepted: 05/18/2012] [Indexed: 12/01/2022]
Abstract
P7, an analogue of the cell-penetrating peptide (CPP) ppTG20, was derived by replacing Phe and Trp with Arg based on the structure-activity relationships of CPPs and antimicrobial peptides (AMPs). P7 showed antimicrobial activity against Salmonella typhimurium at 4 μM and possessed broad antimicrobial activity greater than its parent peptide. P7 displayed good selectivity, with low haemolysis below its minimum inhibitory concentration range, but displayed cytotoxic activity against the HT29 and MDA-MB231 mammalian cell lines. Studies of calcein leakage from egg yolk L-α-phosphatidylcholine/egg yolk L-α-phosphatidyl-DL-glycerol (EYPC/EYPG) (bacterial membrane mimic) and EYPC/cholesterol (eukaryotic membrane mimic) vesicles also demonstrated that P7 exhibited high selectivity and caused pore formation in the bacterial membrane. Circular dichroism experiments suggested that the conformation of P7 underwent transitions from a random coil in sodium phosphate buffer to an α-helical conformation in bacterial model membranes. P7 induced influx of the membrane fluorescent probe 1-N-phenylnaphthylamine (NPN) and the nucleic acid fluorescent probe SYTOX(®) Green by increasing live S. typhimurium cell outer membrane and plasma membrane permeability, respectively. P7 also induced ion channel formation in the cell plasma membrane causing leakage of potassium ions. Flow cytometric analysis demonstrated that S. typhimurium cell membrane integrity was destroyed following incubation with P7. These results indicated that P7 exhibited good bacterial selectivity and exerted its antibacterial activity by a membrane damage mechanism. Furthermore, these results suggested that CPPs may represent a source of templates for AMP design.
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Affiliation(s)
- LiRong Li
- The State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
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Barth AB, Pereira RL, de Vargas BA, Volpato NM. A simple and rapid method to assess butenafine hydrochloride in skin samples and a comparative cutaneous retention study of two marketed formulations. Biomed Chromatogr 2011; 25:1132-7. [PMID: 21337350 DOI: 10.1002/bmc.1582] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2010] [Accepted: 10/26/2010] [Indexed: 11/09/2022]
Abstract
A new method for the quantification of butenafine hydrochloride (BTF) present in the main skin layers was validated and a study conducted with the aim of analyzing the penetration and/or the permeation of the drug. The quantification was performed by liquid chromatography. To evaluate the specificity of the method, the influence of the components of the skin was analyzed, as well as the skin in contact with the excipient ingredients. Linearity was assessed with concentrations in the range of 0.1-10 μg/mL (r(2) = 0.9999) and ANOVA showed non-significant linear deviation (p > 0.05). Adequate results were obtained for repeatability, intra-day precision and accuracy. The obtained values for the limit of quantification and the limit of detection were 68.4 and 17.7 ng/mL, respectively. Also, a comparative study of BTF cutaneous penetration through porcine skin was performed applying two different formulations: Tefin, present in the Brazilian market, and Lotrimin Ultra(®) , available in the American market. No statistical difference was found in the skin (epidermis plus dermis) and in the epidermis (p > 0.05), although in the dermis the difference was significant (p < 0.05). During the experimental period (8 h), no drug permeation from either formulation was detected in the receptor fluid.
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Affiliation(s)
- Aline Bergesch Barth
- Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Porto Alegre-RS, Brazil.
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7
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Venugopal D, Klapper D, Srouji AH, Bhonsle JB, Borschel R, Mueller A, Russell AL, Williams BC, Hicks RP. Novel antimicrobial peptides that exhibit activity against select agents and other drug resistant bacteria. Bioorg Med Chem 2010; 18:5137-47. [PMID: 20558071 DOI: 10.1016/j.bmc.2010.05.065] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Revised: 05/21/2010] [Accepted: 05/23/2010] [Indexed: 11/30/2022]
Affiliation(s)
- Divakaramenon Venugopal
- Department of Chemistry, East Carolina University, Science and Technology Building, Greenville, NC 27858, USA
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8
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Kornhuber J, Henkel AW, Groemer TW, Städtler S, Welzel O, Tripal P, Rotter A, Bleich S, Trapp S. Lipophilic cationic drugs increase the permeability of lysosomal membranes in a cell culture system. J Cell Physiol 2010; 224:152-64. [PMID: 20301195 DOI: 10.1002/jcp.22112] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Lysosomes accumulate many drugs several fold higher compared to their extracellular concentration. This mechanism is believed to be responsible for many pharmacological effects. So far, uptake and release kinetics are largely unknown and interactions between concomitantly administered drugs often provoke mutual interference. In this study, we addressed these questions in a cell culture model. The molecular mechanism for lysosomal uptake kinetics was analyzed by live cell fluorescence microscopy in SY5Y cells using four drugs (amantadine, amitriptyline, cinnarizine, flavoxate) with different physicochemical properties. Drugs with higher lipophilicity accumulated more extensively within lysosomes, whereas a higher pK(a) value was associated with a more rapid uptake. The drug-induced displacement of LysoTracker was neither caused by elevation of intra-lysosomal pH, nor by increased lysosomal volume. We extended our previously developed numerical single cell model by introducing a dynamic feedback mechanism. The empirical data were in good agreement with the results obtained from the numerical model. The experimental data and results from the numerical model lead to the conclusion that intra-lysosomal accumulation of lipophilic xenobiotics enhances lysosomal membrane permeability. Manipulation of lysosomal membrane permeability might be useful to overcome, for example, multi-drug resistance by altering subcellular drug distribution.
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Affiliation(s)
- Johannes Kornhuber
- Department of Psychiatry and Psychotherapy, University of Erlangen-Nuremberg, Erlangen, Germany.
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9
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Russell AL, Kennedy AM, Spuches AM, Venugopal D, Bhonsle JB, Hicks RP. Spectroscopic and thermodynamic evidence for antimicrobial peptide membrane selectivity. Chem Phys Lipids 2010; 163:488-97. [PMID: 20362562 DOI: 10.1016/j.chemphyslip.2010.03.009] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2009] [Revised: 03/23/2010] [Accepted: 03/24/2010] [Indexed: 10/19/2022]
Abstract
In our laboratory we developed a series of antimicrobial peptides that exhibit selectivity and potency for prokaryotic over eukaryotic cells (Hicks et al., 2007). Circular dichroism (CD), isothermal calorimetry (ITC) and calcein leakage assays were conducted to determine the mechanism of lipid binding of a representative peptide 1 (Ac-GF-Tic-Oic-GK-Tic-Oic-GF-Tic-Oic-GK-Tic-KKKK-CONH(2)) to model membranes. POPC liposomes were used as a simple model for eukaryotic membranes and 4:1 POPC:POPG liposomes were used as a simple model for prokaryotic membranes. CD, ITC and calcein leakage data clearly indicate that compound 1 interacts via very different mechanisms with the two different liposome membranes. Compound 1 exhibits weaker binding and induces less calcein leakage in POPC liposomes than POPC:POPG (4:1 mole ratio) liposomes. The predominant binding mechanism to POPC appears to be limited to surface interactions while the mechanism of binding to 4:1 POPC:POPG most likely involves some type of pore formation.
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Affiliation(s)
- Amanda L Russell
- Department of Chemistry, East Carolina University, Science and Technology Building, Greenville, NC 27858, USA
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Domenech O, Francius G, Tulkens PM, Van Bambeke F, Dufrêne Y, Mingeot-Leclercq MP. Interactions of oritavancin, a new lipoglycopeptide derived from vancomycin, with phospholipid bilayers: Effect on membrane permeability and nanoscale lipid membrane organization. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1788:1832-40. [DOI: 10.1016/j.bbamem.2009.05.003] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Revised: 04/25/2009] [Accepted: 05/05/2009] [Indexed: 11/25/2022]
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Dial EJ, Rooijakkers SHM, Darling RL, Romero JJ, Lichtenberger LM. Role of phosphatidylcholine saturation in preventing bile salt toxicity to gastrointestinal epithelia and membranes. J Gastroenterol Hepatol 2008; 23:430-6. [PMID: 17868333 DOI: 10.1111/j.1440-1746.2007.05153.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
BACKGROUND AND AIM The mechanism which protects the biliary and intestinal mucosa from the detergent properties of bile acids is not fully understood. We employed three contrasting in vitro model systems (human red blood cells, polarized intestinal [Caco-2] cells, and synthetic liposomes), to compare the efficacy of saturated and unsaturated phosphatidylcholine (PC) to protect cells and membranes from bile salt injury. METHODS Hemolysis of red blood cells, electrical resistance across confluent monolayers of Caco-2 cells, and disruption of synthetic PC liposomes were assessed after incubation with varying concentrations of bile salt (sodium deoxycholate) alone or in the presence of saturated or unsaturated PC. RESULTS The hemolytic activity of deoxycholate on red blood cells was observed at > or =2 mM, and could be blocked by equimolar concentration or greater of both saturated or unsaturated PC. In contrast, exposure of Caco-2 cells to deoxycholate at > or =0.8 mM induced a maximal decrease in resistance, which was reversed by > or =0.8 mM unsaturated PC or 5 mM saturated PC. Similarly, synthetic liposomes were permeabilized by 0.8 mM deoxycholate and were protected by a lower concentration of unsaturated PC (2 mM) than saturated (5 mM). CONCLUSIONS Cells can show variable resistance to bile salt toxicity. Extracellular PC, especially in the unsaturated state, can directly protect cell and artificial membranes from bile salt injury. These findings support a role for biliary PC in the formation of mixed micelles that have low cytotoxic properties.
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Affiliation(s)
- Elizabeth J Dial
- Department of Integrative Biology and Pharmacology, Medical School, The University of Texas Health Science Center at Houston, Houston, Texas 77030, USA.
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13
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Mathot F, Schanck A, Van Bambeke F, Ariën A, Noppe M, Brewster M, Préat V. Passive diffusion of polymeric surfactants across lipid bilayers. J Control Release 2007; 120:79-87. [PMID: 17524515 DOI: 10.1016/j.jconrel.2007.03.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2006] [Revised: 03/20/2007] [Accepted: 03/23/2007] [Indexed: 11/29/2022]
Abstract
Self-assembling polymeric surfactant, mmePEG(750)P(CL-co-TMC) [monomethylether poly(ethylene glycol)(750)-poly(caprolactone-co-trimethylene carbonate)], increases drug solubility and crosses an enterocyte monolayer both in vitro and in vivo. The aims of the present work were to investigate whether mmePEG(750)P(CL-co-TMC) polymers can diffuse passively through lipid bilayer using parallel artificial membrane permeability assay (PAMPA) and affect membrane properties using liposomes as model. The mmePEG(750)P(CL-co-TMC) polymer was able to cross by passive diffusion an enterocyte-mimicking membrane in PAMPA at concentration which did not perturb membrane integrity. A weak rigidification associated with a low increase in permeability of liposomal lipid bilayers was observed. These data suggest that polymeric surfactants can cross the lipid membrane by passive diffusion and interact with lipid bilayers.
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Affiliation(s)
- Frédéric Mathot
- Université Catholique de Louvain, Unité de Pharmacie Galénique, UCL, Brussels, Belgium
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14
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Dupiereux I, Zorzi W, Lins L, Brasseur R, Colson P, Heinen E, Elmoualij B. Interaction of the 106-126 prion peptide with lipid membranes and potential implication for neurotoxicity. Biochem Biophys Res Commun 2005; 331:894-901. [PMID: 15882962 DOI: 10.1016/j.bbrc.2005.04.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2005] [Indexed: 11/18/2022]
Abstract
Prion diseases are fatal neurodegenerative disorders characterized by the accumulation in the brain of an abnormally misfolded, protease-resistant, and beta-sheet rich pathogenic isoform (PrP(SC)) of the cellular prion protein (PrP(C)). In the present work, we were interested to study the mode of prion protein interaction with the membrane using the 106-126 peptide and small unilamellar lipid vesicles as model. As previously demonstrated, we showed by MTS assay that PrP 106-126 induces alterations in the human neuroblastoma SH-SY5Y cell line. We demonstrated for the first time by lipid-mixing assay and by the liposome vesicle leakage test that PrP 106-126, a non-tilted peptide, induces liposome fusion thus a potential cell membrane destabilization, as supported by membrane integrity assay (LDH). By circular dichroism (CD) analysis we showed that the fusogenic property of PrP 106-126 in the presence of liposome is associated with a predominantly beta-sheet structure. These data suggest that the fusogenic property associated with a predominant beta-sheet structure exhibited by the prion peptides contributes to the neurotoxicity of these peptides by destabilizing cellular membranes. The latter might be attached at the membrane surface in a parallel orientation as shown by molecular modeling.
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Affiliation(s)
- Ingrid Dupiereux
- Department of Human Histology, CRPP, University of Liège, Institute of Pharmacy-CHU 1, avenue de l'Hôpital, Sart Tilman, 4000 Liège, Belgium
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15
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Tyteca D, Schanck A, Dufrêne YF, Deleu M, Courtoy PJ, Tulkens PM, Mingeot-Leclercq MP. The macrolide antibiotic azithromycin interacts with lipids and affects membrane organization and fluidity: studies on Langmuir-Blodgett monolayers, liposomes and J774 macrophages. J Membr Biol 2003; 192:203-15. [PMID: 12820665 DOI: 10.1007/s00232-002-1076-7] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The macrolide antibiotic azithromycin was shown to markedly inhibit endocytosis. Here we investigate the interaction of azithromycin with biomembranes and its effects on membrane biophysics in relation to endocytosis. Equilibrium dialysis and 31P NMR revealed that azithromycin binds to lipidic model membranes and decreases the mobility of phospholipid phosphate heads. In contrast, azithromycin had no effect deeper in the bilayer, based on fluorescence polarization of TMA-DPH and DPH, compounds that, respectively, explore the interfacial and hydrophobic domains of bilayers, and it did not induce membrane fusion, a key event of vesicular trafficking. Atomic force microscopy showed that azithromycin perturbed lateral phase separation in Langmuir-Blodgett monolayers, indicating a perturbation of membrane organization in lateral domains. The consequence of azithromycin/ phospholipid interaction on membrane endocytosis was next evaluated in J774 macrophages by using three tracers with different insertion preferences inside the biological membranes and intracellular trafficking: C6-NBD-SM, TMA-DPH and N-Rh-PE. Azithromycin differentially altered their insertion into the plasma membrane, slowed down membrane trafficking towards lysosomes, as evaluated by the rate of N-Rh-PE self-quenching relief, but did not affect bulk membrane internalization of C6-NBD-SM and TMA-DPH. Azithromycin also decreased plasma membrane fluidity, as shown by TMA-DPH fluorescence polarization and confocal microscopy after labeling by fluorescent concanavalin A. We conclude that azithromycin directly interacts with phospholipids, modifies biophysical properties of membrane and affects membrane dynamics in living cells. This antibiotic may therefore help to elucidate the physico-chemical properties underlying endocytosis.
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Affiliation(s)
- D Tyteca
- Unité de Pharmacologie Cellulaire et Moléculaire, Université Catholique de Louvain, Brussels, Belgium
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Mingeot-Leclercq MP, Lins L, Bensliman M, Van Bambeke F, Van Der Smissen P, Peuvot J, Schanck A, Brasseur R. Membrane destabilization induced by beta-amyloid peptide 29-42: importance of the amino-terminus. Chem Phys Lipids 2002; 120:57-74. [PMID: 12426076 DOI: 10.1016/s0009-3084(02)00108-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Increasing evidence implicates interactions between Abeta-peptides and membrane lipids in Alzheimer's disease. To gain insight into the potential role of the free amino group of the N-terminus of Abeta29-42 fragment in these processes, we have investigated the ability of Abeta29-42 unprotected and Abeta29-42 N-protected to interact with negatively-charged liposomes and have calculated the interaction with membrane lipids by conformational analysis. Using vesicles mimicking the composition of neuronal membranes, we show that both peptides have a similar capacity to induce membrane fusion and permeabilization. The fusogenic effect is related to the appearance of non-bilayer structures where isotropic motions occur as shown by 31P and 2H NMR studies. The molecular modeling calculations confirm the experimental observations and suggest that lipid destabilization could be due to the ability of both peptides to adopt metastable positions in the presence of lipids. In conclusion, the presence of a free or protected (acetylated) amino group in the N-terminus of Abeta29-42 is therefore probably not crucial for destabilizing properties of the C-terminal fragment of Abeta peptides.
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Affiliation(s)
- Marie Paule Mingeot-Leclercq
- Unité de Pharmacologie Cellulaire et Moléculaire, Université Catholique de Louvain, Avenue E. Mounier 73, Bt 7370, B-1200, Brussels, Belgium.
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