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Solis-Gonzalez OA, Avendaño-Gómez JR, Rojas-Aguilar A. A thermodynamic study of F108 and F127 block copolymer interactions with liposomes at physiological temperature. J Liposome Res 2021; 32:32-44. [PMID: 33322974 DOI: 10.1080/08982104.2020.1865401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The interactions of egg yolk phosphatidylcholine liposomes with F108 and F127 triblock copolymers, in the monomer state, were analyzed by isothermal titration calorimetry (ITC) at 37 °C. According to the results, the critical micelle concentration was determined to be 0.4 and 0.04 wt.% for F108 and F127, respectively, by surface tension at 37 °C. According to the results, liposomes/poloxamers were not favoured energetically, since endothermic interactions were observed. However, positive changes in entropy promoted a spontaneous process. F127 had a greater partition coefficient (51.97 ± 1.77 × 104), stronger affinity, than F108 (8.19 ± 0.37 × 104) towards the vesicle lipid bilayer due to its larger hydrophobic block. After the ITC experiments, an increased vesicle size (within about 1-3 nm average) by dynamic light scattering and the formation of bilayer discs by electron microscopy (EM) was observed at low copolymer concentrations (0.57 mol% of F108 and 1.01 mol% of F127). The EM and ITC results confirmed the intimate association of the copolymers with the membrane instead of being simply absorbed onto the bilayer surface. Our results indicate that the temperature of the system (37 °C), the copolymer concentration and hydrophobic chain length are important factors for the interaction of poloxamers with lipid bilayers and the stability of liposomes.
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Affiliation(s)
- Obed Andres Solis-Gonzalez
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, Ciudad de México, México
| | - Juan Ramon Avendaño-Gómez
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, Ciudad de México, México
| | - Aarón Rojas-Aguilar
- Departamento de Química, Centro de Investigación y Estudios Avanzados del IPN, Ciudad de México, México
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Zhang N, Qi R, Chen Y, Ji X, Han Y, Wang Y. Partition of Glutamic Acid-Based Single-Chain and Gemini Amphiphiles into Phospholipid Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13652-13661. [PMID: 30350992 DOI: 10.1021/acs.langmuir.8b02627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Understanding the interactions of amphiphile molecules with biological membranes is very important to many practical applications. Amino acid amphiphiles are a kind of mild surfactants and have many unique performances. However, their interactions with phospholipid membranes have scarcely been studied. This work has studied the interactions of glutamic acid-based gemini amphiphile C12(Glu)2C12 and single-chain amphiphile C12Glu with the model biomembrane formed by the phospholipid 1,2-dioleoyl- sn-glycero-3-phosphocholine (DOPC). The partition coefficients of C12(Glu)2C12 and C12Glu into the DOPC vesicles were derived from the observed enthalpy curves obtained by isothermal titration calorimetry at temperatures of 25.0 and 37.0 °C, and pHs of 5.6 and 7.4, corresponding to the skin surface and human physiological conditions. The results from cryogenic transmission electron microscopy, dynamic light scattering, and zeta potential measurements show that the amphiphile molecules form different aggregates, which make the amphiphile molecules exhibit different partition abilities to the DOPC vesicles. For C12Glu, the molecules form shorter wormlike micelles with a lower surface charge at all the pHs and temperatures used, and the partition coefficient of C12Glu into the DOPC vesicles does not change with temperature and pH. Differently, the C12(Glu)2C12 molecules form fibers with a larger negative charge and belts with a smaller negative charge at pHs 7.4 and 5.6, respectively, no matter what temperature is used. As a result, the partitions of C12(Glu)2C12 into the DOPC vesicles are markedly different at these two pH values, and the belts at pH 7.4 exhibit a stronger partition ability than the fibrils at pH 5.6. Moreover, at any temperature and pH, C12(Glu)2C12 shows a stronger partition ability than C12Glu. This work can help to understand the relationship between the molecular structure and aggregate structure of amino acid amphiphiles and their partition abilities into the biomembranes.
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Affiliation(s)
- Na Zhang
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Ruilian Qi
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Yao Chen
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China
| | - Xiuling Ji
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China
| | - Yuchun Han
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China
| | - Yilin Wang
- Key Laboratory of Colloid, Interface and Chemical Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
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Inácio ÂS, Domingues NS, Nunes A, Martins PT, Moreno MJ, Estronca LM, Fernandes R, Moreno AJM, Borrego MJ, Gomes JP, Vaz WLC, Vieira OV. Quaternary ammonium surfactant structure determines selective toxicity towards bacteria: mechanisms of action and clinical implications in antibacterial prophylaxis. J Antimicrob Chemother 2015; 71:641-54. [PMID: 26679255 DOI: 10.1093/jac/dkv405] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 11/02/2015] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES Broad-spectrum antimicrobial activity of quaternary ammonium surfactants (QAS) makes them attractive and cheap topical prophylactic options for sexually transmitted infections and perinatal vertically transmitted urogenital infections. Although attributed to their high affinity for biological membranes, the mechanisms behind QAS microbicidal activity are not fully understood. We evaluated how QAS structure affects antimicrobial activity and whether this can be exploited for use in prophylaxis of bacterial infections. METHODS Acute toxicity of QAS to in vitro models of human epithelial cells and bacteria were compared to identify selective and potent bactericidal agents. Bacterial cell viability, membrane integrity, cell cycle and metabolism were evaluated to establish the mechanisms involved in selective toxicity of QAS. RESULTS QAS toxicity normalized relative to surfactant critical micelle concentration showed n-dodecylpyridinium bromide (C12PB) to be the most effective, with a therapeutic index of ∼10 for an MDR strain of Escherichia coli and >20 for Neisseria gonorrhoeae after 1 h of exposure. Three modes of QAS antibacterial action were identified: impairment of bacterial energetics and cell division at low concentrations; membrane permeabilization and electron transport inhibition at intermediate doses; and disruption of bacterial membranes and cell lysis at concentrations close to the critical micelle concentration. In contrast, toxicity to mammalian cells occurs at higher concentrations and, as we previously reported, results primarily from mitochondrial dysfunction and apoptotic cell death. CONCLUSIONS Our data show that short chain (C12) n-alkyl pyridinium bromides have a sufficiently large therapeutic window to be good microbicide candidates.
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Affiliation(s)
- Ângela S Inácio
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Neuza S Domingues
- CEDOC, NOVA Medical School
- Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, 1169-056 Lisboa, Portugal
| | - Alexandra Nunes
- Department of Infectious Diseases, National Institute of Health, Lisbon, Portugal
| | - Patrícia T Martins
- Centro de Química de Coimbra and Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - Maria J Moreno
- Centro de Química de Coimbra and Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - Luís M Estronca
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Rui Fernandes
- IBMC/HEMS - Instituto de Biologia Molecular e Celular/Histology and Electron Microscopy Service, Universidade do Porto, Porto, Portugal
| | | | - Maria J Borrego
- Department of Infectious Diseases, National Institute of Health, Lisbon, Portugal
| | - João P Gomes
- Department of Infectious Diseases, National Institute of Health, Lisbon, Portugal
| | - Winchil L C Vaz
- CEDOC, NOVA Medical School
- Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, 1169-056 Lisboa, Portugal
| | - Otília V Vieira
- CEDOC, NOVA Medical School
- Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, 1169-056 Lisboa, Portugal
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Agmo Hernández V, Eriksson EK, Edwards K. Ubiquinone-10 alters mechanical properties and increases stability of phospholipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:2233-43. [DOI: 10.1016/j.bbamem.2015.05.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 05/04/2015] [Accepted: 05/05/2015] [Indexed: 10/23/2022]
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