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Arias J, Díaz S, Ben Altabef A, Dupuy F. Interaction of cysteine and its derivatives with monolayers of dipalmitoylphosphatidylcholine. Colloids Surf B Biointerfaces 2019; 184:110548. [DOI: 10.1016/j.colsurfb.2019.110548] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 08/16/2019] [Accepted: 10/02/2019] [Indexed: 12/18/2022]
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Enhanced Ordering in Monolayers Containing Glycosphingolipids: Impact of Carbohydrate Structure. Biophys J 2019. [PMID: 29539397 DOI: 10.1016/j.bpj.2017.12.044] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The influence of carbohydrate structure on the ordering of glycosphingolipids (GSLs) and surrounding phospholipids was investigated in monolayers at the air-water interface. Binary mixtures composed of GSLs, chosen to span a range of carbohydrate complexity, and zwitterionic dipalmitoylphosphatidylcholine phospholipid, were studied. X-ray reflectivity was used to measure the out-of-plane structure of the monolayers and characterize the extension and conformation of the GSL carbohydrates. Using synchrotron grazing incidence x-ray diffraction, the in-plane packing of the lipid acyl chains and the area per molecule within ordered domains were characterized at different mole ratios of the two components. Our findings indicate that GSL-containing mixtures, regardless of the carbohydrate size, enhance the ordering of the surrounding lipids, resulting in a larger fraction of ordered phase of the monolayer and greater dimensions of the ordered domains. Reduction of the averaged area per molecule within the ordered domains was also observed but only in the cases where there was a size mismatch between the phospholipid headgroups and GSL components, suggesting that the condensation mechanism involves the relief of steric interactions between headgroups in mixtures.
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Applications of Brewster angle microscopy from biological materials to biological systems. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:1749-1766. [PMID: 28655618 DOI: 10.1016/j.bbamem.2017.06.016] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 06/22/2017] [Accepted: 06/23/2017] [Indexed: 12/22/2022]
Abstract
Brewster angle microscopy (BAM) is a powerful technique that allows for real-time visualization of Langmuir monolayers. The lateral organization of these films can be investigated, including phase separation and the formation of domains, which may be of different sizes and shapes depending on the properties of the monolayer. Different molecules or small changes within a molecule such as the molecule's length or presence of a double bond can alter the monolayer's lateral organization that is usually undetected using surface pressure-area isotherms. The effect of such changes can be clearly observed using BAM in real-time, under full hydration, which is an experimental advantage in many cases. While previous BAM reviews focused more on selected compounds or compared the impact of structural variations on the lateral domain formation, this review provided a broader overview of BAM application using biological materials and systems including the visualization of amphiphilic molecules, proteins, drugs, extracts, DNA, and nanoparticles at the air-water interface.
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Yin T, Cao X, Liu X, Wang J, Shi C, Su J, Zhang Y, Gou J, He H, Guo H, Tang X, Zhao Y. Interfacial molecular interactions based on the conformation recognition between the insoluble antitumor drug AD-1 and DSPC. Colloids Surf B Biointerfaces 2016; 146:902-9. [PMID: 27469574 DOI: 10.1016/j.colsurfb.2016.07.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 07/12/2016] [Accepted: 07/19/2016] [Indexed: 11/29/2022]
Abstract
In this study, molecular interactions between the anti-cancer agent 20(R)-25-methoxyl-dammarane-3β, 12β, 20-triol (AD-1) and phospholipid 1,2-Distearoyl-sn-glycero-3-phosphocholine (DSPC) were investigated using the Langmuir film balance technique. The characteristics of binary Langmuir monolayers consisting of DSPC and AD-1 were conducted on the basis of the surface pressure-area per molecule (π-A) isotherms. It was found that the drug was able to become efficiently inserted into preformed DSPC monolayers, indicating a preferential interaction between AD-1 and DSPC. For the examined lateral pressure at 20mN/m, the largest negative values of ΔGex were found for the AD-1/DSPC monolayer, which should be the most stable. Based on the calculated values of ΔGex, we found that the AD-1/DSPC systems exhibited the best mixed characteristics when the molar fraction of the AD-1 was 0.8; at that relative concentration, the AD-1 molecules can mix better and interact with the phospholipid molecules. In addition, the drug-DSPC binary supramolecular structure was also deposited on the mica plates as shown by atomic force microscopy (AFM). Finally, molecular docking calculations explained satisfactorily that, based on the conformations interactions (conformation recognition), even at an AD-1/DSPC molar ratio as high as 8:2, the interfacial stabilization of the AD-1/DSPC system was fairly strong due to hydrophobic interactions. A higher loading capacity of DSPC might be possible, as it is associated with a more flexible geometrical environment, which allows these supramolecular structures to accept larger increases in drug loading upon steric binding.
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Affiliation(s)
- Tian Yin
- School of Functional food and Wine, Shenyang Pharmaceutical University, Shenyang 110016, China; School of Chinese Materia Media, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Xiuxiu Cao
- School of Chinese Materia Media, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Xiaolin Liu
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Jian Wang
- Key Laboratory of Structure-based Drug Design and Discovery, Shenyang Pharmaceutical University, ministry of Education, Shenyang 110016, China
| | - Caihong Shi
- School of Functional food and Wine, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Jia Su
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Yu Zhang
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Jingxin Gou
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Haibing He
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Haiyan Guo
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Xing Tang
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China.
| | - Yuqing Zhao
- School of Functional food and Wine, Shenyang Pharmaceutical University, Shenyang 110016, China.
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Heredia V, Alasino RV, Leonhard V, Garro AG, Maggio B, Beltramo DM. Sialoganglioside Micelles for Enhanced Paclitaxel Solubility: In Vitro Characterization. J Pharm Sci 2016; 105:268-75. [PMID: 26852858 DOI: 10.1016/j.xphs.2015.10.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 09/04/2015] [Accepted: 10/22/2015] [Indexed: 11/15/2022]
Abstract
Efficiency of mono-sialogangliosides to load Paclitaxel (Ptx) has recently been found to depend on the structure of the polysaccharide chain. In this study, we demonstrated that incorporation of only one more sialic acid into the ganglioside molecule, independently of its position, causes a 4-fold increase in Ptx-loading capacity, the maximum being at a 5:1 molar ratio (di-sialoganglioside/Paclitaxel, GD/Ptx). These complexes are stable in solution for at least 3 months, and over 90% of Ptx remains loaded in the micelles after extreme stress conditions such as high-speed centrifugation, lyophilization, or freeze-thaw cycles. Ganglioside micelles protect 50% of the initially loaded Ptx from alkaline hydrolysis after 24 h at pH 10. Dynamic light scattering studies revealed that GD micelles increase their size from 9 to 12 nm when loaded with Ptx. Transmission electron microscopy shows a homogeneous population of spherical micelles either with or without Ptx. In vitro biological activity was similar to that of the free drug. These results provide further options of self-assembled nanostructures of di- and tri-sialogangliosides with a higher loading capacity.
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Affiliation(s)
- Valeria Heredia
- Centro de Excelencia en Productos y Procesos de Córdoba (CEPROCOR), Córdoba, Argentina
| | - Roxana V Alasino
- Centro de Excelencia en Productos y Procesos de Córdoba (CEPROCOR), Córdoba, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
| | - Victoria Leonhard
- Centro de Excelencia en Productos y Procesos de Córdoba (CEPROCOR), Córdoba, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Ariel G Garro
- Centro de Excelencia en Productos y Procesos de Córdoba (CEPROCOR), Córdoba, Argentina
| | - Bruno Maggio
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina; Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Dante M Beltramo
- Centro de Excelencia en Productos y Procesos de Córdoba (CEPROCOR), Córdoba, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina; Cátedra de Biotecnología, Facultad de Ciencias Químicas, Universidad Católica de Córdoba, Córdoba, Argentina.
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