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Premadasa UI, Kumar N, Zhu Z, Stamberga D, Li T, Roy S, Carrillo JMY, Einkauf JD, Custelcean R, Ma YZ, Bocharova V, Bryantsev VS, Doughty B. Synergistic Assembly of Charged Oligomers and Amino Acids at the Air-Water Interface: An Avenue toward Surface-Directed CO 2 Capture. ACS APPLIED MATERIALS & INTERFACES 2024; 16:12052-12061. [PMID: 38411063 DOI: 10.1021/acsami.3c18225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
Interfaces are considered a major bottleneck in the capture of CO2 from air. Efforts to design surfaces to enhance CO2 capture probabilities are challenging due to the remarkably poor understanding of chemistry and self-assembly taking place at these interfaces. Here, we leverage surface-specific vibrational spectroscopy, Langmuir trough techniques, and simulations to mechanistically elucidate how cationic oligomers can drive surface localization of amino acids (AAs) that serve as CO2 capture agents speeding up the apparent rate of absorption. We demonstrate how tuning these interfaces provides a means to facilitate CO2 capture chemistry to occur at the interface, while lowering surface tension and improving transport/reaction probabilities. We show that in the presence of interfacial AA-rich aggregates, one can improve capture probabilities vs that of a bare interface, which holds promise in addressing climate change through the removal of CO2 via tailored interfaces and associated chemistries.
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Affiliation(s)
- Uvinduni I Premadasa
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Nitesh Kumar
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Zewen Zhu
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Diana Stamberga
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Tianyu Li
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Santanu Roy
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jan-Michael Y Carrillo
- Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jeffrey D Einkauf
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Radu Custelcean
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Ying-Zhong Ma
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Vera Bocharova
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Vyacheslav S Bryantsev
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Benjamin Doughty
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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2
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Abstract
Pulmonary surfactant is a critical component of lung function in healthy individuals. It functions in part by lowering surface tension in the alveoli, thereby allowing for breathing with minimal effort. The prevailing thinking is that low surface tension is attained by a compression-driven squeeze-out of unsaturated phospholipids during exhalation, forming a film enriched in saturated phospholipids that achieves surface tensions close to zero. A thorough review of past and recent literature suggests that the compression-driven squeeze-out mechanism may be erroneous. Here, we posit that a surfactant film enriched in saturated lipids is formed shortly after birth by an adsorption-driven sorting process and that its composition does not change during normal breathing. We provide biophysical evidence for the rapid formation of an enriched film at high surfactant concentrations, facilitated by adsorption structures containing hydrophobic surfactant proteins. We examine biophysical evidence for and against the compression-driven squeeze-out mechanism and propose a new model for surfactant function. The proposed model is tested against existing physiological and pathophysiological evidence in neonatal and adult lungs, leading to ideas for biophysical research, that should be addressed to establish the physiological relevance of this new perspective on the function of the mighty thin film that surfactant provides.
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Affiliation(s)
- Fred Possmayer
- Department of Biochemistry, Western University, London, Ontario N6A 3K7, Canada
- Department of Obstetrics/Gynaecology, Western University, London, Ontario N6A 3K7, Canada
| | - Yi Y Zuo
- Department of Mechanical Engineering, University of Hawaii at Manon, Honolulu, Hawaii 96822, United States
- Department of Pediatrics, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii 96826, United States
| | - Ruud A W Veldhuizen
- Department of Physiology & Pharmacology, Western University, London, Ontario N6A 5C1, Canada
- Department of Medicine, Western University, London, Ontario N6A 3K7, Canada
- Lawson Health Research Institute, London, Ontario N6A 4V2, Canada
| | - Nils O Petersen
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
- Department of Chemistry, Western University, London, Ontario N6A 5B7, Canada
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Kergomard J, Carrière F, Paboeuf G, Chonchon L, Barouh N, Vié V, Bourlieu C. Interfacial adsorption and activity of pancreatic lipase-related protein 2 onto heterogeneous plant lipid model membranes. Biochimie 2023; 215:12-23. [PMID: 37062468 DOI: 10.1016/j.biochi.2023.04.001] [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: 12/20/2022] [Revised: 03/24/2023] [Accepted: 04/04/2023] [Indexed: 04/18/2023]
Abstract
Pancreatic lipase related-protein 2 (PLRP2) exhibits remarkable galactolipase and phospholipase A1 activities, which depend greatly on the supramolecular organization of the substrates and the presence of surfactant molecules such as bile salts. The objective of the study was to understand the modulation of the adsorption mechanisms and enzymatic activity of Guinea pig PLRP2 (gPLRP2), by the physical environment of the enzyme and the physical state of its substrate. Langmuir monolayers were used to reproduce homogeneous and heterogeneous photosynthetic model membranes containing galactolipids (GL), and/or phospholipids (PL), and/or phytosterols (pS), presenting uncharged or charged interfaces. The same lipid mixtures were also used to form micrometric liposomes, and their gPLRP2 catalyzed digestion kinetics were investigated in presence or in absence of bile salts (NaTDC) during static in vitro, so called "bulk", digestion. The enzymatic activity of gPLRP2 onto the galactolipid-based monolayers was characterized with an optimum activity at 15 mN/m, in the absence of bile salts. gPLRP2 showed enhanced adsorption onto biomimetic model monolayer containing negatively charged lipids. However, the compositional complexity in the heterogeneous uncharged model systems induced a lag phase before the initiation of lipolysis. In bulk, no enzymatic activity could be demonstrated on GL-based liposomes in the absence of bile salts, probably due to the high lateral pressure of the lipid bilayers. In the presence of NaTDC (4 mM), however, gPLRP2 showed both high galactolipase and moderate phospholipase A1 activities on liposomes, probably due to a decrease in packing and lateral pressure upon NaTDC adsorption, and subsequent disruption of liposomes.
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Affiliation(s)
- Jeanne Kergomard
- IPR Institute of Physics, Université de Rennes, France; INRAE/UM/Institut Agro Montpellier UMR 1208 IATE, France
| | - Frédéric Carrière
- Aix-Marseille Université, CNRS, UMR7281 Bioénergétique et Ingénierie des Protéines, Marseille, France
| | - Gilles Paboeuf
- IPR Institute of Physics, Université de Rennes, France; Univ Rennes, CNRS, ScanMAT - UMS 2001, F-35042, Rennes, France
| | | | - Nathalie Barouh
- CIRAD, UMR QUALISUD, F34398, Montpellier, France; Qualisud, Univ Montpellier, Avignon Université, CIRAD, Institut Agro, Université de La Réunion, Montpellier, France
| | - Véronique Vié
- IPR Institute of Physics, Université de Rennes, France; Univ Rennes, CNRS, ScanMAT - UMS 2001, F-35042, Rennes, France.
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4
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Sudjarwo WAA, Toca-Herrera JL. Unraveling Complex Hysteresis Phenomenon in 1,2-Dipalmitoyl-sn-Glycero-3-Phosphocholine Monolayer: Insight into Factors Influencing Surface Dynamics. Int J Mol Sci 2023; 24:16252. [PMID: 38003442 PMCID: PMC10671618 DOI: 10.3390/ijms242216252] [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: 10/20/2023] [Revised: 11/06/2023] [Accepted: 11/08/2023] [Indexed: 11/26/2023] Open
Abstract
This study explores the hysteresis phenomenon in DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine) monolayers, considering several variables, including temperature, compression and expansion rates, residence time, and subphase content. The investigation focuses on analyzing the influence of these variables on key indicators such as the π-A isotherm curve, loop area, and compression modulus. By employing the Langmuir-Blodgett technique, the findings reveal that all the examined factors significantly affect the aforementioned parameters. Notably, the hysteresis loop, representing dissipated energy, provides valuable insights into the monolayer's viscoelasticity, molecular packing, phase transition changes, and resistance during the isocycle process. These findings contribute to a comprehensive understanding of the structural and dynamic properties of DPPC monolayers, offering insights into their behavior under varying conditions. Moreover, the knowledge gained from this study can aid in the development of precise models and strategies for controlling and manipulating monolayer properties, with potential applications in drug delivery systems, surface coatings, as well as further investigation into air penetration into alveoli and the blinking mechanism.
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Affiliation(s)
- Wisnu Arfian A. Sudjarwo
- Institute of Biophysics, Department of Bionanosciences, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria
| | - José L. Toca-Herrera
- Institute of Biophysics, Department of Bionanosciences, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria
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5
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Lux J, Kieserling H, Koop J, Drusch S, Schwarz K, Keppler J, Steffen-Heins A. Identification of an optimized ratio of amyloid and non-amyloid fractions in engineered fibril solutions from whey protein isolate for improved foaming. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Li G, Zuo YY. Molecular and colloidal self-assembly at the oil–water interface. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2022.101639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Gasymov OK, Kecel-Gunduz S, Celik S, Akyuz S, Ozel AE, Agaeva G, Suleymanova LM, Agaeva U, Bakhishova M, Aliyev JA. Molecular docking of the pentapeptide derived from rice bran protein as anticancer agent inhibiting both receptor and non-receptor tyrosine kinases. J Biomol Struct Dyn 2022:1-23. [PMID: 35477348 DOI: 10.1080/07391102.2022.2067234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The cationic pentapeptide Glu-Gln-Arg-Pro-Arg (EQRPR) belongs to the family of anti-cancer peptides with significant anti-cancer activity. However, the mechanism by which the peptide performs this activity is unknown. In this study, we explored the pharmaceutical profile of Glu-Gln-Arg-Pro-Arg pentapeptide and revealed its anticancer properties by in silico docking studies. Moreover, the effect of EQRPR behavior of the DPPC membrane was investigated by means of Langmuir monolayer technique and the results were discussed in terms of mutual interactions. To evaluate the binding mechanisms, the pentapeptide and its various D-amino acid substituted analogs were docked to both epidermal growth factor receptor (EGFR) tyrosine kinase and proto-oncogene tyrosine-protein kinase, Fyn. Simultaneous binding of the pentapeptides to both EGFR and Fyn proteins, which are receptor- and non-receptor-kinases, respectively, suggest that these peptides can be an effective agent for cancer treatment. Moreover, to show the potential of the investigated pentapeptides to overcome the generated mutation-related drug resistance to EGFR targeted therapies, molecular docking investigations of EQRPR and all its D-analogs were performed against the prospective targets: Wild type EGFRWT and mutant EGFRT790M. Erlotinib and TAK-285 were used as reference molecules. The strong interaction of the peptide with EGFRWT (from -9.24 to -9.75 kcal/mol) and the secondary mutant EGFRT790M (from -9.28 to -9.64 kcal/mol) observed in most cancer recurrence cases indicates its good potential to overcome drug resistance in cancer therapy. In addition, the pharmacological properties of the investigated pentapeptides were revealed by in silico ADME (Absorption, Distribution, Metabolism, Excretion) and toxicity analysis.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Oktay K Gasymov
- Laboratory of Structure, Dynamics and Functions of Biomolecules, Institute of Biophysics of ANAS, Baku, Azerbaijan
| | - Serda Kecel-Gunduz
- Physics Department, Science Faculty, Istanbul University, Istanbul, Turkey
| | - Sefa Celik
- Physics Department, Science Faculty, Istanbul University, Istanbul, Turkey
| | - Sevim Akyuz
- Physics Department, Science and Letters Faculty, Istanbul Kultur University, Istanbul, Turkey
| | - Ayşen E Ozel
- Physics Department, Science Faculty, Istanbul University, Istanbul, Turkey
| | - Gulshen Agaeva
- Department of Biophysics, Institute for Physical Problems, Baku State University, Baku, Azerbaijan
| | - Leman M Suleymanova
- Laboratory of Structure, Dynamics and Functions of Biomolecules, Institute of Biophysics of ANAS, Baku, Azerbaijan
| | - Ulker Agaeva
- Department of Biophysics, Institute for Physical Problems, Baku State University, Baku, Azerbaijan
| | - Matanat Bakhishova
- Laboratory of Structure, Dynamics and Functions of Biomolecules, Institute of Biophysics of ANAS, Baku, Azerbaijan
| | - J A Aliyev
- National Center of Oncology, Azerbaijan Republic Ministry of Health, H. Zardabi, Baku, Azerbaijan
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8
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Optimization and Antibacterial Response of N-Halamine Coatings Based on Polydopamine. COLLOIDS AND INTERFACES 2022. [DOI: 10.3390/colloids6010009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Due to the ability of microorganisms to first adhere to a material surface and then to lead to the formation of a biofilm, it is essential to develop surfaces that have antimicrobial properties. It is well known that N-halamine coatings allow us to prevent or minimize such phenomena. In the present work, various polydopamine (PDA) coatings containing chloramine functions were studied. In fact, three PDA-based films were formed by the simple immersion of a gold substrate in a dopamine solution, either at pH 8 in the presence or not of polyethyleneimine (PEI), or at pH 5 in the presence of periodate as an oxidant. These films were characterized by polarization modulation reflection absorption infrared spectroscopy and X-ray photoelectron spectroscopy analyses, and by scanning electron microscopy observations. The chlorination of these PDA films was performed by their immersion in a sodium hypochlorite aqueous solution, in order to immobilize Cl(+I) into the (co)polymers (PDA or PDA–PEI). Finally, antibacterial assays towards the Gram-negative bacteria Escherichia coli (E. coli) and the Gram-positive bacteria Staphylococcus epidermidis (S. epidermidis) were conducted to compare the bactericidal properties of these three N-halamine coatings. Regardless of the bacteria tested, the PDA coating with the best antibacterial properties is the coating obtained using periodate.
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9
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Hoffmann M, Drescher S, Ihling C, Hinderberger D, Schwieger C. An Azidolipid Monolayer - Transitions, Miscibility, and UV Reactivity Studied by Infrared Reflection Absorption Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12804-12815. [PMID: 33090001 DOI: 10.1021/acs.langmuir.0c01726] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this study, we characterized monolayers of an azide-modified lipid at the air-water interface, pure and in its mixtures with the model lipid DPPC, with the aim of proving its potential to be applied for photo-cross-linking with other molecules. We chose a phospholipid bearing a terminal azide group in one of its hydrophobic tails to study its monolayer characteristics with the Langmuir film balance technique. Furthermore, we performed infrared reflection absorption spectroscopy (IRRAS) to get detailed insights into the organization of those monolayers as well as high-resolution mass spectrometry (HRMS) to see the effects of UV-irradiation on the lipids' chemical structure and organization. Our results suggest that in expanded monolayers of pure azide-modified membrane lipids, the azido-terminated chain folds back toward the air-water interface. Above the LE/LC (liquid-expanded/liquid-condensed) phase transition, the chains stretched, and thus, the azide group detaches from the interface. From temperature-dependent monolayer compressions, we evaluated all relevant thermodynamic parameters of the monolayers, such as the phase transition pressure, the critical temperature, and the triple point, and compare them to those of model lipids. For future applications, we studied the miscibility of the azide-modified lipid with DPPC in monolayers and found at least a certain miscibility over all investigated mixing ratios ranging from 10 to 75% of the azidolipid. Finally, we irradiated the azidolipid monolayer with UV light at 305 nm and measured photodissociation of the azide, leading to chemical cross-linking with other lipids, which shows the potential to be used as a cross-linking agent within self-assembled lipid or lipid/protein layers.
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Affiliation(s)
- Matthias Hoffmann
- Institute of Chemistry - Complex Self-Organizing Systems, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
- Institute of Biochemistry and Biotechnology - Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, MLU Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle (Saale), Germany
| | - Simon Drescher
- Institute of Pharmacy - Biophysical Pharmacy, MLU Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle (Saale), Germany
- Phospholipid Research Center, Im Neuenheimer Feld 515, 69120 Heidelberg, Germany
| | - Christian Ihling
- Institute of Pharmacy - Pharmaceutical Chemistry and Bioanalytics, Charles Tanford Protein Center, MLU Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle (Saale), Germany
| | - Dariush Hinderberger
- Institute of Chemistry - Complex Self-Organizing Systems, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
- Institute of Biochemistry and Biotechnology - Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, MLU Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle (Saale), Germany
| | - Christian Schwieger
- Institute of Chemistry - Complex Self-Organizing Systems, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
- Institute of Biochemistry and Biotechnology - Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, MLU Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle (Saale), Germany
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10
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Nazi N, Humblot V, Debiemme-Chouvy C. A New Antibacterial N-Halamine Coating Based on Polydopamine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11005-11014. [PMID: 32830496 DOI: 10.1021/acs.langmuir.0c01856] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
To prevent the formation of biofilms on material surfaces, the latter must have antibacterial properties. The aim of this study is to investigate the synthesis and the antibacterial effect of a new N-halamine coating based on polydopamine (PDA). The benefits of this coating are multiple, notably the green process used to prepare it and the wide variety of organic or inorganic materials that can be functionalized. First, the formation of the PDA coating by oxidative polymerization of dopamine in weak alkaline aqueous solution was studied and characterized. Then, these PDA films were exposed to a NaOCl solution in order to form chloramine functions into the coating, i.e., to immobilize oxidative chlorine on and into the coating. The PDA film chlorination was notably followed in situ by a quartz crystal microbalance (QCM). The influence of the NaOCl solution pH and concentration on chlorination kinetics and on PDA film degradation was evidenced. Finally, the antibacterial properties of the modified PDA coatings were highlighted by testing their antiadhesion and bactericidal properties toward the Escherichia coli bacterial strain.
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Affiliation(s)
- Nadia Nazi
- Sorbonne Université, Laboratoire de Réactivité de Surface, UMR CNRS 7197, 4 place Jussieu, Paris 75005, France
- Sorbonne Université, Laboratoire Interfaces et Systèmes Electrochimiques, UMR CNRS 8235, 4 place Jussieu, Paris 75005, France
| | - Vincent Humblot
- Sorbonne Université, Laboratoire de Réactivité de Surface, UMR CNRS 7197, 4 place Jussieu, Paris 75005, France
- FEMTO-ST Institute, UMR CNRS 6174, Université Bourgogne Franche-Comté, 15B avenue des Montboucons, Besançon Cedex 25030, France
| | - Catherine Debiemme-Chouvy
- Sorbonne Université, Laboratoire Interfaces et Systèmes Electrochimiques, UMR CNRS 8235, 4 place Jussieu, Paris 75005, France
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11
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12
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Bai X, Xu L, Tang JY, Zuo YY, Hu G. Adsorption of Phospholipids at the Air-Water Surface. Biophys J 2019; 117:1224-1233. [PMID: 31519299 DOI: 10.1016/j.bpj.2019.08.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 08/03/2019] [Accepted: 08/19/2019] [Indexed: 11/15/2022] Open
Abstract
Phospholipids are ubiquitous components of biomembranes and common biomaterials used in many bioengineering applications. Understanding adsorption of phospholipids at the air-water surface plays an important role in the study of pulmonary surfactants and cell membranes. To date, however, the biophysical mechanisms of phospholipid adsorption are still unknown. It is challenging to reveal the molecular structure of adsorbed phospholipid films. Using combined experiments with constrained drop surfactometry and molecular dynamics simulations, here, we studied the biophysical mechanisms of dipalmitoylphosphatidylcholine (DPPC) adsorption at the air-water surface. It was found that the DPPC film adsorbed from vesicles showed distinct equilibrium surface tensions from the DPPC monolayer spread via organic solvents. Our simulations revealed that only the outer leaflet of the DPPC vesicle is capable of unzipping and spreading at the air-water surface, whereas the inner leaflet remains intact and forms an inverted micelle to the interfacial monolayer. This inverted micelle increases the local curvature of the monolayer, thus leading to a loosely packed monolayer at the air-water surface and hence a higher equilibrium surface tension. These findings provide novel insights, to our knowledge, into the mechanism of the phospholipid and pulmonary surfactant adsorption and may help understand the structure-function correlation in biomembranes.
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Affiliation(s)
- Xuan Bai
- Department of Engineering Mechanics, Zhejiang University, Hangzhou, China; The State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China; School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China
| | - Lu Xu
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii
| | - Jenny Y Tang
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii
| | - Yi Y Zuo
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii; Department of Pediatrics, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, Hawaii.
| | - Guoqing Hu
- Department of Engineering Mechanics, Zhejiang University, Hangzhou, China.
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13
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Tian F, Lin X, Valle RP, Zuo YY, Gu N. Poly(amidoamine) Dendrimer as a Respiratory Nanocarrier: Insights from Experiments and Molecular Dynamics Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5364-5371. [PMID: 30888182 DOI: 10.1021/acs.langmuir.9b00434] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Pulmonary drug delivery is superior to the systemic administration in treating lung diseases. An optimal respiratory nanocarrier should be able to efficiently and safely cross the pulmonary surfactant film, which serves as the first biological barrier for respiratory delivery and plays paramount roles in maintaining the proper mechanics of breathing. In this work, we focused on the interactions between poly(amidoamine) (PAMAM) dendrimers and a model pulmonary surfactant. With combined Langmuir monolayer experiments and coarse-grained molecular dynamics simulations, we studied the effect of environmental temperature, size, and surface property of PAMAM dendrimers (G3-OH, G3-NH2, G5-OH, and G5-NH2) on the dipalmitoylphosphatidylcholine (DPPC) monolayer. Our simulations indicated that the environmental temperature could significantly affect the influence of PAMAM dendrimers on the DPPC monolayer. Therefore, results obtained at room temperature cannot be directly applied to elucidate interactions at body temperature. Simulations at body temperature found that all tested PAMAM dendrimers can easily penetrate the lipid monolayer during the monolayer expansion process (mimicking "inhalation"), and the cationic PAMAM dendrimers (-NH2) show promising penetration ability during the monolayer compression process (mimicking "expiration"). Larger PAMAM dendrimers (G5) adsorbed onto the lipid monolayer tend to induce structural collapse and inhibit normal phase transitions of the lipid monolayer. These adverse effects could be mitigated in the subsequent expansion-compression cycle. These findings suggest that the PAMAM dendrimer may be used as a potential respiratory drug nanocarrier.
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Affiliation(s)
- Fujia Tian
- Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , Beijing 100083 , China
| | - Xubo Lin
- Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , Beijing 100083 , China
- Key Laboratory of Ministry of Education for Biomechanics and Mechanobiology, School of Biological Science and Medical Engineering , Beihang University , Beijing 100083 , China
- State Key Laboratory of Bioelectronics and Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science & Medical Engineering , Southeast University , Nanjing 210096 , China
| | - Russell P Valle
- Department of Mechanical Engineering , University of Hawaii at Manoa , Honolulu , Hawaii 96822 , United States
| | - Yi Y Zuo
- Department of Mechanical Engineering , University of Hawaii at Manoa , Honolulu , Hawaii 96822 , United States
| | - Ning Gu
- State Key Laboratory of Bioelectronics and Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science & Medical Engineering , Southeast University , Nanjing 210096 , China
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14
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Yang J, Yu K, Tsuji T, Jha R, Zuo YY. Determining the surface dilational rheology of surfactant and protein films with a droplet waveform generator. J Colloid Interface Sci 2018; 537:547-553. [PMID: 30469122 DOI: 10.1016/j.jcis.2018.11.054] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 11/13/2018] [Accepted: 11/13/2018] [Indexed: 11/17/2022]
Abstract
Understanding rheological properties of surfactant and protein films plays a crucial role in a variety of industrial and research areas, such as food processing, cosmetics, and pharmacology. To determine the surface dilational modulus using drop shape analysis, one needs to measure the dynamic surface tension in response to a sinusoidal oscillation of the surface area of the droplet. Despite many applications of drop shape analysis in studying interfacial rheology, oscillation of the droplet surface area is usually controlled in an indirect manner. Existing methods are only capable of controlling volume oscillations of the droplet rather than its surface area. We have developed an arbitrary waveform generator (AWG) to directly oscillate the surface area of a millimeter-sized droplet in a predefined sinusoidal waveform. Here, we demonstrated the capacity of this AWG, in conjunction with constrained drop surfactometry (CDS), in studying the surface dilational rheology of adsorbed surfactant and protein films. It is found that the surface dilational modulus determined for a dilute surfactant (C12DMPO) and two protein solutions (bovine serum albumin and β-casein) revealed their adsorption mechanisms. Our methods hold promise in studying the interfacial rheology of various thin-film materials, biomembranes, foams, and emulsions.
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Affiliation(s)
- Jinlong Yang
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822, United States.
| | - Kyle Yu
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822, United States.
| | - Tomoaki Tsuji
- Department of Precision Mechanics, Chuo University, Tokyo 112-8551, Japan.
| | - Rajeev Jha
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822, United States.
| | - Yi Y Zuo
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822, United States; Department of Pediatrics, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI 96826, United States.
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