1
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Razmimanesh F, Sodeifian G. Investigation of temperature-responsive tocosomal nanocarriers as the efficient and robust drug delivery system for Sunitinib malate anti-cancer drug: Effects of MW and chain length of PNIPAAm on LCST and dissolution rate. J Pharm Sci 2021; 111:1937-1951. [PMID: 34963573 DOI: 10.1016/j.xphs.2021.12.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 12/23/2021] [Accepted: 12/23/2021] [Indexed: 10/19/2022]
Abstract
In this study, for the first time, the coated tocosome by blend of chitosan, CS, and poly(N-isopropylacrylamide), PNIPAAm, was developed as the efficient and robust drug delivery system with improved drug encapsulation efficiency, extended stability, proper particle size and industrial upscaling for Sunitinib malate anti-cancer drug. Tocosome was synthesized by using Mozafari method as a scalable and robust method and without the need for organic solvents. The effects of tocosome composition and drug concentration on the stability, particle size of tocosome, zeta potential, encapsulation efficacy and loading of drug into it were investigated by Taguchi method, and optimum composition was selected for combining with the polymeric blend. Homopolymer of PNIPAAm was synthesized by two different polymerization methods, including free radical and reversible addition-fragmentation chain transfer (RAFT). Effects of molecular weight (MW) and chain length of the polymers on lower critical solution temperature (LCST) were examined. The developed nanocarrier in this research, CS-Raft-PNIPAAm-tocosome, indicated LCST value beyond 37°C (about 45°C) and this is suitable for hyperthermia and spatio-temporal release of drug particles.
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Affiliation(s)
- Fariba Razmimanesh
- Department of Chemical Engineering, Faculty of Engineering, University of Kashan, 87317-53153, Kashan, Iran; Laboratory of Supercriritcal Fluids and Nanotechnology, University of Kashan, 87317-53153, Kashan, Iran; Biotechnology Centre, Faculty of Engineering, University of Kashan, 87317-53153, Kashan, Iran
| | - Gholamhossein Sodeifian
- Department of Chemical Engineering, Faculty of Engineering, University of Kashan, 87317-53153, Kashan, Iran; Laboratory of Supercriritcal Fluids and Nanotechnology, University of Kashan, 87317-53153, Kashan, Iran; Biotechnology Centre, Faculty of Engineering, University of Kashan, 87317-53153, Kashan, Iran.
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2
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Soler M, Lechuga LM. Biochemistry strategies for label-free optical sensor biofunctionalization: advances towards real applicability. Anal Bioanal Chem 2021; 414:5071-5085. [PMID: 34735605 PMCID: PMC9242939 DOI: 10.1007/s00216-021-03751-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/18/2021] [Accepted: 10/22/2021] [Indexed: 12/01/2022]
Abstract
Label-free biosensors, and especially those based on optical transducers like plasmonic or silicon photonic systems, have positioned themselves as potential alternatives for rapid and highly sensitive clinical diagnostics, on-site environmental monitoring, and for quality control in foods or other industrial applications, among others. However, most of the biosensor technology has not yet been transferred and implemented in commercial products. Among the several causes behind that, a major challenge is the lack of standardized protocols for sensor biofunctionalization. In this review, we summarize the most common methodologies for sensor surface chemical modification and bioreceptor immobilization, discussing their advantages and limitations in terms of analytical sensitivity and selectivity, reproducibility, and versatility. Special focus is placed on the suggestions of innovative strategies towards antifouling and biomimetic functional coatings to boost the applicability and reliability of optical biosensors in clinics and biomedicine. Finally, a brief overview of research directions in the area of device integration, automation, and multiplexing will give a glimpse of the future perspectives for label-free optical biosensors.
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Affiliation(s)
- Maria Soler
- Nanobiosensors and Bioanalytical Applications Group (NanoB2A), Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, BIST, and CIBER-BBN, Bellaterra, 08193, Barcelona, Spain.
| | - Laura M Lechuga
- Nanobiosensors and Bioanalytical Applications Group (NanoB2A), Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, BIST, and CIBER-BBN, Bellaterra, 08193, Barcelona, Spain
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3
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Maximova K, Reuter N, Trylska J. Peptidomimetic inhibitors targeting the membrane-binding site of the neutrophil proteinase 3. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:1502-1509. [DOI: 10.1016/j.bbamem.2019.06.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 06/04/2019] [Accepted: 06/17/2019] [Indexed: 02/07/2023]
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4
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Puiggalí-Jou A, Del Valle LJ, Alemán C. Biomimetic hybrid membranes: incorporation of transport proteins/peptides into polymer supports. SOFT MATTER 2019; 15:2722-2736. [PMID: 30869096 DOI: 10.1039/c8sm02513d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Molecular sensing, water purification and desalination, drug delivery, and DNA sequencing are some striking applications of biomimetic hybrid membranes. These devices take advantage of biomolecules, which have gained excellence in their specificity and efficiency during billions of years, and of artificial materials that load the purified biological molecules and provide technological properties, such as robustness, scalability, and suitable nanofeatures to confine the biomolecules. Recent methodological advances allow more precise control of polymer membranes that support the biomacromolecules, and are expected to improve the design of the next generation of membranes as well as their applicability. In the first section of this review we explain the biological relevance of membranes, membrane proteins, and the classification used for the latter. After this, we critically analyse the different approaches employed for the production of highly selective hybrid membranes, focusing on novel materials made of self-assembled block copolymers and nanostructured polymers. Finally, a summary of the advantages and disadvantages of the different methodologies is presented and the main characteristics of biomimetic hybrid membranes are highlighted.
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Affiliation(s)
- Anna Puiggalí-Jou
- Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. I2, 08019, Barcelona, Spain. and Barcelona Research Center for Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. C, 08019, Barcelona, Spain
| | - Luis J Del Valle
- Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. I2, 08019, Barcelona, Spain. and Barcelona Research Center for Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. C, 08019, Barcelona, Spain
| | - Carlos Alemán
- Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. I2, 08019, Barcelona, Spain. and Barcelona Research Center for Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. C, 08019, Barcelona, Spain
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5
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Mouffouk F, Aouabdi S, Al-Hetlani E, Serrai H, Alrefae T, Leo Chen L. New generation of electrochemical immunoassay based on polymeric nanoparticles for early detection of breast cancer. Int J Nanomedicine 2017; 12:3037-3047. [PMID: 28450780 PMCID: PMC5399978 DOI: 10.2147/ijn.s127086] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Screening and early diagnosis are the key factors for the reduction of mortality rate and treatment cost of cancer. Therefore, sensitive and selective methods that can reveal the low abundance of cancer biomarkers in a biological sample are always desired. Here, we report the development of a novel electrochemical biosensor for early detection of breast cancer by using bioconjugated self-assembled pH-responsive polymeric micelles. The micelles were loaded with ferrocene molecules as "tracers" to specifically target cell surface-associated epithelial mucin (MUC1), a biomarker for breast and other solid carcinoma. The synthesis of target-specific, ferrocene-loaded polymeric micelles was confirmed, and the resulting sensor was capable of detecting the presence of MUC1 in a sample containing about 10 cells/mL. Such a high sensitivity was achieved by maximizing the loading capacity of ferrocene inside the polymeric micelles. Every single event of binding between the antibody and antigen was represented by the signal of hundreds of thousands of ferrocene molecules that were released from the polymeric micelles. This resulted in a significant increase in the intensity of the ferrocene signal detected by cyclic voltammetry.
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Affiliation(s)
- Fouzi Mouffouk
- Department of Chemistry, Kuwait University, Safat, Kuwait
| | - Sihem Aouabdi
- King Abdullah International Medical Research Center (KAIMRC), Jeddah, Kingdom of Saudi Arabia
| | | | - Hacene Serrai
- Department of Radiology and Nuclear Medicine, University Hospital of Gent (UZG), Gent, Belgium
| | - Tareq Alrefae
- Department of Physics, Kuwait University, Safat, Kuwait
| | - Liaohai Leo Chen
- Surgical Precision Research Lab. Department of Surgery, University of Illinois at Chicago, IL, USA
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6
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Tajik-Ahmadabad B, Mechler A, Muir BW, McLean K, Hinton TM, Separovic F, Polyzos A. A QCM-D and SAXS Study of the Interaction of Functionalised Lyotropic Liquid Crystalline Lipid Nanoparticles with siRNA. Chembiochem 2017; 18:921-930. [DOI: 10.1002/cbic.201600613] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Behnoosh Tajik-Ahmadabad
- School of Chemistry; Bio21 Institute; The University of Melbourne; Melbourne VIC 3010 Australia
- CSIRO; Manufacturing Flagship; Research Way Clayton VIC 3168 Australia
| | - Adam Mechler
- La Trobe Institute for Molecular Science; La Trobe University; Bundoora VIC 3083 Australia
| | - Benjamin W. Muir
- CSIRO; Manufacturing Flagship; Research Way Clayton VIC 3168 Australia
| | - Keith McLean
- CSIRO; Manufacturing Flagship; Research Way Clayton VIC 3168 Australia
| | - Tracey M. Hinton
- CSIRO Health and Biosecurity; Australian Animal Health Laboratory; 5 Portarlington Road Geelong VIC 3220 Australia
| | - Frances Separovic
- School of Chemistry; Bio21 Institute; The University of Melbourne; Melbourne VIC 3010 Australia
| | - Anastasios Polyzos
- School of Chemistry; Bio21 Institute; The University of Melbourne; Melbourne VIC 3010 Australia
- CSIRO; Manufacturing Flagship; Research Way Clayton VIC 3168 Australia
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7
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Hayward SL, Francis DM, Sis MJ, Kidambi S. Ionic Driven Embedment of Hyaluronic Acid Coated Liposomes in Polyelectrolyte Multilayer Films for Local Therapeutic Delivery. Sci Rep 2015; 5:14683. [PMID: 26423010 PMCID: PMC4589783 DOI: 10.1038/srep14683] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 09/07/2015] [Indexed: 02/07/2023] Open
Abstract
The ability to control the spatial distribution and temporal release of a therapeutic remains a central challenge for biomedical research. Here, we report the development and optimization of a novel substrate mediated therapeutic delivery system comprising of hyaluronic acid covalently functionalized liposomes (HALNPs) embedded into polyelectrolyte multilayer (PEM) platform via ionic stabilization. The PEM platform was constructed from sequential deposition of Poly-L-Lysine (PLL) and Poly(Sodium styrene sulfonate) (SPS) "(PLL/SPS)4.5" followed by adsorption of anionic HALNPs. An adsorption affinity assay and saturation curve illustrated the preferential HALNP deposition density for precise therapeutic loading. (PLL/SPS)2.5 capping layer on top of the deposited HALNP monolayer further facilitated complete nanoparticle immobilization, cell adhesion, and provided nanoparticle confinement for controlled linear release profiles of the nanocarrier and encapsulated cargo. To our knowledge, this is the first study to demonstrate the successful embedment of a translatable lipid based nanocarrier into a substrate that allows for temporal and spatial release of both hydrophobic and hydrophilic drugs. Specifically, we have utilized our platform to deliver chemotherapeutic drug Doxorubicin from PEM confined HALNPs. Overall, we believe the development of our HALNP embedded PEM system is significant and will catalyze the usage of substrate mediated delivery platforms in biomedical applications.
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Affiliation(s)
- Stephen L. Hayward
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, NE, 68588
| | - David M. Francis
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, NE, 68588
| | - Matthew J. Sis
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, NE, 68588
| | - Srivatsan Kidambi
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, NE, 68588
- Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, NE, 68588
- Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, NE, 68198
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8
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Hagedorn S, Drolle E, Lorentz H, Srinivasan S, Leonenko Z, Jones L. Atomic force microscopy and Langmuir-Blodgett monolayer technique to assess contact lens deposits and human meibum extracts. JOURNAL OF OPTOMETRY 2015; 8:187-199. [PMID: 25620317 PMCID: PMC4502087 DOI: 10.1016/j.optom.2014.12.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 12/01/2014] [Accepted: 12/09/2014] [Indexed: 06/04/2023]
Abstract
PURPOSE The purpose of this exploratory study was to investigate the differences in meibomian gland secretions, contact lens (CL) lipid extracts, and CL surface topography between participants with and without meibomian gland dysfunction (MGD). METHODS Meibum study: Meibum was collected from all participants and studied via Langmuir-Blodgett (LB) deposition with subsequent Atomic Force Microscopy (AFM) visualization and surface roughness analysis. CL Study: Participants with and without MGD wore both etafilcon A and balafilcon A CLs in two different phases. CL lipid deposits were extracted and analyzed using pressure-area isotherms with the LB trough and CL surface topographies and roughness values were visualized using AFM. RESULTS Meibum study: Non-MGD participant meibum samples showed larger, circular aggregates with lower surface roughness, whereas meibum samples from participants with MGD showed more lipid aggregates, greater size variability and higher surface roughness. CL Study: Worn CLs from participants with MGD had a few large tear film deposits with lower surface roughness, whereas non-MGD participant-worn lenses had many small lens deposits with higher surface roughness. Balafilcon A pore depths were shallower in MGD participant worn lenses when compared to non-MGD participant lenses. Isotherms of CL lipid extracts from MGD and non-MGD participants showed a seamless rise in surface pressure as area decreased; however, extracts from the two different lens materials produced different isotherms. CONCLUSIONS MGD and non-MGD participant-worn CL deposition were found to differ in type, amount, and pattern of lens deposits. Lipids from MGD participants deposited irregularly whereas lipids from non-MGD participants showed more uniformity.
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Affiliation(s)
- Sarah Hagedorn
- School of Optometry and Vision Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
| | - Elizabeth Drolle
- Department of Biology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1; Waterloo Institute of Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
| | - Holly Lorentz
- School of Optometry and Vision Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1; Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L8
| | - Sruthi Srinivasan
- School of Optometry and Vision Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1.
| | - Zoya Leonenko
- Department of Biology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1; Waterloo Institute of Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1; Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
| | - Lyndon Jones
- School of Optometry and Vision Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1; Department of Biology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1; Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
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9
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Alam S, Alves DS, Whitehead SA, Bayer AM, McNitt CD, Popik VV, Barrera FN, Best MD. A clickable and photocleavable lipid analogue for cell membrane delivery and release. Bioconjug Chem 2015; 26:1021-31. [PMID: 25927978 DOI: 10.1021/acs.bioconjchem.5b00044] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
For drug delivery purposes, the ability to conveniently attach a targeting moiety that will deliver drugs to cells and then enable controlled release of the active molecule after localization is desirable. Toward this end, we designed and synthesized clickable and photocleavable lipid analogue 1 to maximize the efficiency of bioconjugation and triggered release. This compound contains a dibenzocyclooctyne group for bioorthogonal derivatization linked via a photocleavable 2-nitrobenzyl moiety at the headgroup of a synthetic lipid backbone for targeting to cell membranes. To assess delivery and release using this system, we report fluorescence-based assays for liposomal modification and photocleavage in solution as well as through surface immobilization to demonstrate successful liposome functionalization and photoinduced release. In addition, fluorophore delivery to and release from live cells was confirmed and characterized using fluorescence microscopy and flow cytometry analysis in which 1 was delivered to cells, derivatized, and photocleaved. Finally, drug delivery studies were performed using an azide-tagged analogue of camptothecin, a potent anticancer drug that is challenging to deliver due to poor solubility. In this case, the ester attachment of the azide tag acted as a caging group for release by intracellular esterases rather than through photocleavage. This resulted in a dose-dependent response in the presence of liposomes containing delivery agent 1, confirming the ability of this compound to stimulate delivery to the cytoplasm of cells.
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Affiliation(s)
| | | | | | | | - Christopher D McNitt
- §Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Vladimir V Popik
- §Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
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10
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Bayer AM, Alam S, Mattern-Schain SI, Best MD. Triggered Liposomal Release through a Synthetic Phosphatidylcholine Analogue Bearing a Photocleavable Moiety Embedded within thesn-2 Acyl Chain. Chemistry 2014; 20:3350-7. [DOI: 10.1002/chem.201304094] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Indexed: 01/31/2023]
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11
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Polysaccharide-anchored fatty acid liposome. Int J Pharm 2013; 441:414-23. [DOI: 10.1016/j.ijpharm.2012.11.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 10/14/2012] [Accepted: 11/09/2012] [Indexed: 11/18/2022]
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12
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13
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García-Uriostegui L, Burillo G, Concheiro A, Alvarez-Lorenzo C. Immobilization of liposomes on temperature-responsive polymer networks cross-linked with poly-L-lysine and grafted onto polypropylene. Des Monomers Polym 2012. [DOI: 10.1080/15685551.2012.725215] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Affiliation(s)
- Lorena García-Uriostegui
- a Instituto de Ciencias Nucleares, UNAM, Ciudad universitaria , Circuito Exterior, DF , 04510 , México
| | - Guillermina Burillo
- a Instituto de Ciencias Nucleares, UNAM, Ciudad universitaria , Circuito Exterior, DF , 04510 , México
| | - Angel Concheiro
- b Departamento de Farmacia y Tecnología Farmacéutica , Universidad de Santiago Compostela , 15782- , Santiago de Compostela , Spain
| | - Carmen Alvarez-Lorenzo
- b Departamento de Farmacia y Tecnología Farmacéutica , Universidad de Santiago Compostela , 15782- , Santiago de Compostela , Spain
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14
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Tan HW, Misran M. Characterization of fatty acid liposome coated with low-molecular-weight chitosan. J Liposome Res 2012; 22:329-35. [DOI: 10.3109/08982104.2012.700459] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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15
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Fraser SJ, Mulet X, Martin L, Praporski S, Mechler A, Hartley PG, Polyzos A, Separovic F. Surface immobilization of bio-functionalized cubosomes: sensing of proteins by quartz crystal microbalance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:620-627. [PMID: 22085432 DOI: 10.1021/la2032994] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A strategy for tethering lipid liquid crystalline submicrometer particles (cubosomes) to a gold surface for the detection of proteins is reported. Time-resolved quartz crystal microbalance (QCM-D) was used to monitor the cubosome-protein interaction in real time. To achieve specific binding, cubosomes were prepared from the nonionic surfactant phytantriol, block-copolymer, Pluronic F-127, and a secondary biotinylated lipid, 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[biotinyl(polyethyleneglycol)-2000], which enabled attachment of the particles to a neutravidin (NAv)-alkanethiol monolayer at the gold surface of the QCM sensor chip. A second set of cubosomes was further functionalized with addition of the glycolipid (G(M1)) to facilitate a specific binding uptake of the protein, cholera toxin B subunit (CT(B)), from solution. QCM-D confirmed the specificity of the cubosome-NAv binding. The analysis of titration experiments, also performed with QCM, suggests that an optimal concentration of cubosomes is required for the efficient packing of the particles at the surface: high cubosome concentrations lead to chaotic cubosome binding onto the surface, sterically inhibiting surface attachment, or require significant reorganization to permit uniform cubosome coverage. The methodology enabled the straightforward preparation of a complex nanostructured edifice, which was then used to specifically capture analyte proteins (cholera toxin B subunit or free NAv) from solution, supporting the potential for development of this approach as a biosensing platform.
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Affiliation(s)
- Scott J Fraser
- School of Chemistry, Bio21 Institute, The University of Melbourne, Melbourne, VIC 3010, Australia
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16
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Bostic HE, Smith MD, Poloukhtine AA, Popik VV, Best MD. Membrane labeling and immobilization viacopper-free click chemistry. Chem Commun (Camb) 2012; 48:1431-3. [DOI: 10.1039/c1cc14415d] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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17
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Huang NP, De Paul SM, Textor M. “Docking Sites”: Nanometer-Scale Organization of a Reactive, Protein-resistant, Graft Copolymer-Based Interface for Macromolecule Immobilization. Biomacromolecules 2011; 12:4213-20. [DOI: 10.1021/bm2009872] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ning-Ping Huang
- State Key Laboratory of Bioelectronics,
School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, P.R. China
- Laboratory for Surface Science
and Technology, Department of Materials, Swiss Federal Institute of Technology, ETH-Zurich, Wolfgang-Pauli-Strasse
10, 8093 Zurich, Switzerland
| | - Susan M. De Paul
- Laboratory for Surface Science
and Technology, Department of Materials, Swiss Federal Institute of Technology, ETH-Zurich, Wolfgang-Pauli-Strasse
10, 8093 Zurich, Switzerland
| | - Marcus Textor
- Laboratory for Surface Science
and Technology, Department of Materials, Swiss Federal Institute of Technology, ETH-Zurich, Wolfgang-Pauli-Strasse
10, 8093 Zurich, Switzerland
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18
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Dubiel EA, Martin Y, Vermette P. Bridging the Gap Between Physicochemistry and Interpretation Prevalent in Cell−Surface Interactions. Chem Rev 2011; 111:2900-36. [DOI: 10.1021/cr9002598] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Evan A. Dubiel
- Laboratoire de bio-ingénierie et de biophysique de l’Université de Sherbrooke, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 Boulevard de l’Université, Sherbrooke, Québec, Canada J1K 2R1
- Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, Québec, Canada J1H 4C4
| | - Yves Martin
- Laboratoire de bio-ingénierie et de biophysique de l’Université de Sherbrooke, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 Boulevard de l’Université, Sherbrooke, Québec, Canada J1K 2R1
- Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, Québec, Canada J1H 4C4
| | - Patrick Vermette
- Laboratoire de bio-ingénierie et de biophysique de l’Université de Sherbrooke, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 Boulevard de l’Université, Sherbrooke, Québec, Canada J1K 2R1
- Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, Québec, Canada J1H 4C4
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19
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Smith MD, Best MD. Characterization of protein-membrane binding interactions via a microplate assay employing whole liposome immobilization. Methods Mol Biol 2011; 751:477-89. [PMID: 21674350 DOI: 10.1007/978-1-61779-151-2_30] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Protein-cell membrane binding interactions control numerous vital biological processes, many of which can go awry during disease onset. However, the study of these events is complicated by the complexity of the membrane bilayer. These efforts would benefit from a rapid and easily accessible method for characterizing protein-membrane recognition events. Herein, we describe a microplate-based method for the detection of protein-membrane binding that employs whole liposome immobilization using a biotin anchor. First, control studies are detailed to test for nonspecific liposome immobilization (fluorescence assay; see Subheading 3.2), and to ensure that liposomes remain intact on the microplate surface (dye leakage assay; see Subheading 3.3). Finally, a protein-membrane binding detection assay is described through the example of protein kinase Cα binding to surface-immobilized whole liposomes (see Subheading 3.4).
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Oleson TA, Sahai N, Pedersen JA. Electrostatic effects on deposition of multiple phospholipid bilayers at oxide surfaces. J Colloid Interface Sci 2010; 352:327-36. [DOI: 10.1016/j.jcis.2010.08.057] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2010] [Revised: 08/18/2010] [Accepted: 08/20/2010] [Indexed: 11/27/2022]
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21
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Vermette P. Liposome characterization by quartz crystal microbalance measurements and atomic force microscopy. Methods Enzymol 2010; 465:43-73. [PMID: 19913161 DOI: 10.1016/s0076-6879(09)65003-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2023]
Abstract
This chapter reviews liposome characterization by quartz crystal microbalance (QCM) measurements and atomic force microscopy (AFM). In many studies, AFM imaging is simply used to image liposomes with resolution often that does not allow morphological analysis. Although liposome size can be obtained by processing AFM images, it is found that liposomes flatten upon surface adsorption or immobilization. Liposome stability and stiffness have been characterized by using AFM imaging or AFM force measurements, although the latter method, using a microsphere attached on the AFM cantilever, seems more appropriate to limit liposome damage and to obtain more quantitative analysis, such as the Young's modulus. Investigation of liposome layers by QCM revealed that liposomes can be detected from a combined analysis of frequency and bandwidth shifts. However, QCM by itself provides only limited information on liposomes. QCM can be used to assess the presence of a layer and also to discriminate between rigid and viscoelastic ones. Liposome properties have been derived from QCM curves, but often this requires making hypotheses that are difficult to assess. AFM and QCM analyses need to be combined with other techniques to provide complementary information.
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Affiliation(s)
- Patrick Vermette
- Laboratoire de Bioingénierie et de Biophysique de l'Université de Sherbrooke, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, Sherbrooke, Québec, Canada
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22
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23
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Grzelakowski M, Onaca O, Rigler P, Kumar M, Meier W. Immobilized protein-polymer nanoreactors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2009; 5:2545-2548. [PMID: 19681036 DOI: 10.1002/smll.200900603] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Affiliation(s)
- Mariusz Grzelakowski
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
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24
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Vasilev K, Casanal A, Challougui H, Griesser HJ. Template-assisted generation of nanocavities within plasma polymer films. J Phys Chem B 2009; 113:7059-63. [PMID: 19438274 DOI: 10.1021/jp807986k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The generation of nanosized cavities within thin film layers is of interest for a number of fundamental and applied reasons. One challenge is to make such systems sufficiently robust mechanically. Plasma polymer (pp) films possess excellent mechanical stability if deposition conditions are selected such as to achieve a sufficient density of cross-linking and resistance to extraction of polymeric material by solvents. In this study, gold nanoparticles of 15 and 70 nm diameter were used as sacrificial templates to generate nanocavities in pp films of various thickness values in the tens of nanometers range. A first pp layer was deposited onto substrates using n-heptylamine (HA) to a thickness of 20 nm. Carboxy-thiolated gold nanoparticles were electrostatically bound onto the surface amine groups of the n-heptylamine plasma polymer (HApp) layer. A second HApp layer was then coated to various thicknesses onto the nanoparticle/HApp surface. The template particles embedded thus in-between the two HApp layers were then dissolved using aqueous KCN solution; monitoring of the plasmon resonance band of the gold nanoparticles enabled verification of template stripping and measurement of the kinetics of stripping. AFM topography images showed little change on extraction of the template nanoparticles, indicating that the plasma polymer layer maintained structural integrity upon template extraction and subsequent drying, and thereby prevented collapse of the empty nanocavities. The concept of template stripping to generate controlled size free volume in thin plasma polymer layers is thus shown to produce robust structures.
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Affiliation(s)
- Krasimir Vasilev
- Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Adelaide, Australia.
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25
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Losey EA, Smith MD, Meng M, Best MD. Microplate-based analysis of protein-membrane binding interactions via immobilization of whole liposomes containing a biotinylated anchor. Bioconjug Chem 2009; 20:376-83. [PMID: 19143516 DOI: 10.1021/bc800414k] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cellular membranes play key roles in the regulation of a range of important biological processes. However, the characterization of membrane involvement in these events is difficult to achieve due to the complexity of the membrane bilayer and the challenges associated with handling and analyzing these systems. As such, rapid and reliable approaches for characterizing membrane-based processes are necessary. To address this issue, we have first developed an azide-tagged modular lipid anchor scaffold (2) that can be conveniently derivatized via click chemistry to functionalize the membrane surface. This was used to access biotin- and fluorescein-lipid conjugates 1a and 1b, respectively. These compounds were then employed to perform and characterize the immobilization of liposomes containing biotin-anchor 1a onto streptavidin-coated microplates. Results from these studies indicated clean, biotin-dependent surface deposition. This strategy for liposome attachment was then applied to a microplate-based platform to detect the binding of receptor proteins to immobilized liposomes, specifically for the membrane binding of protein kinase Calpha (PKCalpha). The resulting data indicated direct detection of binding to the membrane-functionalized surface. The reported approaches provide efficient methods for the derivatization of the membrane surface, which is applicable to the study of membrane-based processes. Finally, the described microplate-based liposome binding assay allows for high-throughput analysis of important protein-membrane binding events.
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Affiliation(s)
- Erin A Losey
- Department of Chemistry, the University of Tennessee, Knoxville, Tennessee 37996, USA
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26
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Mozafari MR, Reed CJ, Rostron C, Hasirci V. A Review of Scanning Probe Microscopy Investigations of Liposome-DNA Complexes. J Liposome Res 2008; 15:93-107. [PMID: 16194929 DOI: 10.1081/lpr-64965] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Liposome-DNA complexes are one of the most promising systems for the protection and delivery of nucleic acids to combat neoplastic, viral, and genetic diseases. In addition, they are being used as models in the elucidation of many biological phenomena such as viral infection and transduction. In order to understand these phenomena and to realize the mechanism of nucleic acid transfer by liposome-DNA complexes, studies at the molecular level are required. To this end, scanning probe microscopy (SPM) is increasingly being used in the characterization of lipid layers, lipid aggregates, liposomes, and their complexes with nucleic acid molecules. The most attractive attributes of SPM are the potential to image samples with subnanometer spatial resolution under physiological conditions and provide information on their physical and mechanical properties. This review describes the application of scanning tunneling microscopy and atomic force microscopy, the two most commonly applied SPM techniques, in the characterisation of liposome-DNA complexes.
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Affiliation(s)
- M R Mozafari
- School of Pharmacy and Chemistry, Liverpool John Moores University, England, UK.
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27
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Progress in fabricating arrays of soft spherical vessels on mesoscale with spatial control. Sci Bull (Beijing) 2008. [DOI: 10.1007/s11434-008-0485-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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28
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Tarasova A, Griesser HJ, Meagher L. AFM study of the stability of a dense affinity-bound liposome layer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:7371-7377. [PMID: 18547080 DOI: 10.1021/la8002959] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Liposomes that are surface-bound to a biomaterial such as a contact lens are of interest for localized delivery of therapeutic agents, but it is not known whether such liposome layers are sufficiently robust. The stability of a dense, PEG-functionalized layer of liposomes, affinity-bound onto a multilayer coated surface, was tested under various stress conditions using colloid-probe atomic force miscroscopy (AFM). The different stress effects were generated by varying the applied normal load of the probe and the impinging fluid shear through different approach velocities and by varying the applied lateral forces by scanning under increasing force loads. The effect of applied forces (normal and lateral) was further investigated by coating the probe with a layer of albumin. The liposomes remained intact following the ramping of both protein-coated and uncoated probes under the normal and lateral loads. The low-fouling nature of these liposomes, with respect to nonspecific protein adsorption, was also demonstrated from the interaction force measurements which showed only weak adhesion from the protein layer during the contact period of the albumin-coated probe. The observed adhesive interactions were concluded to be a direct result of the applied load from the probe, during the force measurements, rather than from attraction of the protein molecules for the surface-bound liposomes. The low frictional response of the liposome layer indicated the viscoelastic nature of these molecules, which enabled liposome structure retention during the continuous load application. The demonstrated stability of the liposomes presents a system of viable and localized drug delivery in, for example, ophthalmic applications.
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Affiliation(s)
- Anna Tarasova
- CSIRO Molecular and Health Technologies, Bag 10, Bayview Avenue, Clayton, Victoria 3168, Australia.
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29
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Pasquardini L, Lunelli L, Vanzetti L, Anderle M, Pederzolli C. Immobilization of cationic rifampicin-loaded liposomes on polystyrene for drug-delivery applications. Colloids Surf B Biointerfaces 2008; 62:265-72. [DOI: 10.1016/j.colsurfb.2007.10.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2006] [Revised: 07/21/2007] [Accepted: 10/24/2007] [Indexed: 10/22/2022]
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Brochu H, Vermette P. Young's moduli of surface-bound liposomes by atomic force microscopy force measurements. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:2009-2014. [PMID: 18198906 DOI: 10.1021/la702382d] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Mechanical properties of layers of intact liposomes attached by specific interactions on solid surfaces were studied by atomic force microscopy (AFM) force measurements. Force-distance measurements using colloidal probe tips were obtained over liposome layers and used to calculate Young's moduli by using the Hertz contact theory. A classical Hertz model and a modified Hertz one have been used to extract Young's moduli from AFM force curves. The modified model, proposed by Dimitriadis, is correcting for the finite sample thickness since Hertz's classical model is assuming that the sample is infinitely thick. Values for Young's moduli of 40 and 8 kPa have been obtained using the Hertz model for one and three layers of intact liposomes, respectively. Young's moduli of approximately 3 kPa have been obtained using the corrected Hertz model for both one and three layers of surface-bound liposomes. Compression work performed by the colloidal probe to compress these liposome layers has also been calculated.
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Affiliation(s)
- Heïdi Brochu
- Department of Chemical Engineering, Université de Sherbrooke, 2500, blvd de l'Université, Sherbrooke, Québec, Canada, J1K 2R1
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31
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Volodkin D, Arntz Y, Schaaf P, Moehwald H, Voegel JC, Ball V. Composite multilayered biocompatible polyelectrolyte films with intact liposomes: stability and temperature triggered dye release. SOFT MATTER 2007; 4:122-130. [PMID: 32907092 DOI: 10.1039/b713563g] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The design of new quasi-2D biocompatible films able to release a drug in a controlled manner through the application of physical stimuli is of outstanding interest in biomaterials science. Herein, construction of composite nanofilms with multiple strata of stabilized large unilamellar liposomes is developed. The film has a multilayered architecture formed by the layer-by-layer (LbL) technique utilising two biocompatible polyelectrolytes, hyaluronic acid and poly-l-lysine (HA and PLL), onto which phospholipid liposome "interlayers" are adsorbed and subsequently embedded by further polyelectrolyte adsorption. First of all the morphology of the film surface is characterised and compared to the morphology obtained for a film containing the same polyelectrolytes but stiff polystyrene (PS) latex particles instead of the soft phospholipid vesicles. Both morphologies appear to be similar suggesting that the embedded vesicles keep their spherical shape. As a second step, it has been shown that carboxyfluorescein (CF) encapsulated in the vesicles remains inside without sustained release at room temperature indicating that the liposomes stay intact upon LbL immobilization. A substantial fraction (about 70%) of the vesicles absorbed onto the polyelectrolyte film are desorbed upon further polyelectrolyte adsorption to reach the embedded state. Hence to achieve high loading of the film, multiple vesicle depositions have to be performed. It is shown that the total number of deposited vesicles on the film is proportional to the number m of vesicle deposition steps (up to m = 3). The encapsulated dye can be released in a controlled manner by a temperature increase above the main phase transition temperature of the lipid mixture used to prepare the vesicles. Release kinetics is faster for film-entrapped vesicles than for those in solution due to destabilization of the lipidic bilayer by the polyelectrolyte environment. The developed composite films represent a new surface biocoating able to preserve, in native state, or to release in a controlled way, surface immobilized materials under external stimuli.
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Affiliation(s)
- Dmitry Volodkin
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085 Strasbourg Cedex, France. and Université Louis Pasteur (ULP), Faculté de Chirurgie Dentaire, 1 place de l'Hôpital, 67000 Strasbourg Cedex, France and Max-Planck Institute for Colloids and Interfaces (MPI), D-14424 Potsdam, Germany
| | - Youri Arntz
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085 Strasbourg Cedex, France. and Université Louis Pasteur (ULP), Faculté de Chirurgie Dentaire, 1 place de l'Hôpital, 67000 Strasbourg Cedex, France
| | - Pierre Schaaf
- Institut Charles Sadron (ICS), Centre National de la Recherche Scientifique, Unité Propre 22, 6 rue Boussingault, 67083 Strasbourg Cedex, France
| | - Helmuth Moehwald
- Max-Planck Institute for Colloids and Interfaces (MPI), D-14424 Potsdam, Germany
| | - Jean-Claude Voegel
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085 Strasbourg Cedex, France. and Université Louis Pasteur (ULP), Faculté de Chirurgie Dentaire, 1 place de l'Hôpital, 67000 Strasbourg Cedex, France
| | - Vincent Ball
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 595, 11 rue Humann, 67085 Strasbourg Cedex, France. and Université Louis Pasteur (ULP), Faculté de Chirurgie Dentaire, 1 place de l'Hôpital, 67000 Strasbourg Cedex, France
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32
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Danion A, Arsenault I, Vermette P. Antibacterial activity of contact lenses bearing surface-immobilized layers of intact liposomes loaded with levofloxacin. J Pharm Sci 2007; 96:2350-63. [PMID: 17541976 DOI: 10.1002/jps.20871] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In vitro methods to evaluate antibacterial activity were used with contact lenses bearing levofloxacin-loaded liposomes developed for the prevention and treatment of bacterial ocular infections such as keratitis. Levofloxacin was incorporated into liposomes before these intact liposomes were immobilized onto the surfaces of soft contact lenses using a multilayer immobilization strategy. The release of levofloxacin from contact lenses bearing 2, 5, and 10 layers of liposomes into a saline buffer at 37 degrees C was monitored by fluorescence. The levofloxacin release, as a function of time, was described by a mechanism taking into account two independent first-order kinetic models. The total release of levofloxacin from the contact lenses was completed within 6 days. The release of levofloxacin from contact lenses bearing 10 layers of liposomes and subsequently soaked overnight in a levofloxacin solution was also studied and compare to that of dried contact lenses without any chemical modification rehydrated in a levofloxacin solution. The antibacterial activity of the liposome-coated contact lenses against Staphylococcus aureus was evaluated by measuring (i) the diameters of the inhibition zone on an agar plate and (ii) the optical density using a broth assay. The liposome-coated lenses showed an antibacterial activity both on agar and in broth following 24 h. When initial bacteria inocula were equal or below 10(6) CFU/mL, all the bacteria were inhibited within 2 h. When using initial bacteria inocula of 10(8) CFU/mL, an initial burst release provided by soaking the liposomal lenses was required for the first hours to inhibit bacteria growth.
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Affiliation(s)
- Anne Danion
- Laboratoire de Bioingénierie et de Biophysique de l'Université de Sherbrooke, Department of Chemical Engineering, Université de Sherbrooke, 2500, blvd de l'Université, Sherbrooke, Québec, Canada, J1K 2R1
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33
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Brochu H, Vermette P. Liposome layers characterized by quartz crystal microbalance measurements and multirelease delivery. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:7679-86. [PMID: 17547426 DOI: 10.1021/la7003547] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Intact liposomes have been immobilized onto solid surfaces by a NeutrAvidin-biotin link. The construction of these layers has been followed up by X-ray photoelectron spectroscopy (XPS) and quartz crystal microbalance (QCM) measurements with energy dissipation monitoring. Also, the simultaneous release of two fluorescent probes from these liposome layers has been investigated with the aim to validate this method in multirelease delivery systems. XPS showed the successful immobilization of the different layers. XPS results also point out the importance of the deactivation method used to reveal the presence of the specific NeutrAvidin-biotin attachment. QCM measurements allowed the buildup of the different layers to be followed in real time and in situ and suggest that biotinylated liposomes stay intact upon surface attachment on NeutrAvidin-covered surfaces and had viscoelastic behavior. QCM experiments also demonstrated that surface-immobilized liposomes were able to resist irreversible adsorption from fetal bovine serum. Release kinetic profiles were studied by monitoring the release of two different fluorescent probes, namely, carboxyfluorescein and levofloxacin, from these liposome layers. These studies showed that it was possible to modulate to some extent the release rates of the two molecules by using different configurations of liposome layers.
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Affiliation(s)
- Heïdi Brochu
- Laboratoire de Bioingénierie et de Biophysique de l'Université de Sherbrooke, Department of Chemical Engineering, Université de Sherbrooke, 2500 blvd de l'Université, Sherbrooke, Québec, Canada J1K 2R1
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Danion A, Brochu H, Martin Y, Vermette P. Fabrication and characterization of contact lenses bearing surface-immobilized layers of intact liposomes. J Biomed Mater Res A 2007; 82:41-51. [PMID: 17265438 DOI: 10.1002/jbm.a.31147] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Intact liposomes were immobilized onto soft contact lenses. In the first step, polyethylenimine was covalently bounded onto the hydroxyl groups available on the surface of a commercial contact lens (Hioxifilcon B). Then, NHS-PEG-biotin molecules were bounded onto the surface amine groups by carbodiimide chemistry. NeutrAvidin were bounded onto the PEG-biotin layer. Liposomes containing PEG-biotinylated lipids were docked onto the surface-immobilized NeutrAvidin. Consecutive addition of further NeutrAvidin and liposome layers enabled fabrication of multilayers. Multilayers of liposomes were also produced by exposing contact lenses coated with NeutrAvidin to liposome aggregates produced by the addition of free biotin in solution. XPS revealed the immobilization of the different layers. By blocking with excess biotin surface-immobilized NeutrAvidin on contact lenses bearing PEG-biotin layers produced under cloud point conditions, ELISA showed that the docking of NeutrAvidin was dependent on biotin-NeutrAvidin affinity binding, with little evidence for nonspecific physisorption; however, it was not possible to differentiate specific versus nonspecific binding of NeutrAvidin attached onto PEG-biotin layers grafted without cloud point conditions. AFM imaging revealed liposome sizes of 106 and 155 nm for layers of liposomes produced (i) by the consecutive addition of further NeutrAvidin and liposomes and (ii) by the exposure of NeutrAvidin-coated contact lenses to liposome aggregates, respectively. The release kinetics of a fluorescent dye demonstrated that intact liposomes had been immobilized onto contact lens surfaces. The stability of surface-immobilized liposomes onto contact lens surfaces showed temperature dependence. Surface-bound liposomes can be stored up to 1 month at 4 degrees C with little release of their content.
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Affiliation(s)
- Anne Danion
- Laboratoire de Bioingénierie et de Biophysique de l'Université de Sherbrooke, Department of Chemical Engineering, Université de Sherbrooke, 2500, Blvd de l'Université, Sherbrooke, Québec, Canada J1K 2R1
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35
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Kalyankar ND, Sharma MK, Vaidya SV, Calhoun D, Maldarelli C, Couzis A, Gilchrist L. Arraying of intact liposomes into chemically functionalized microwells. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:5403-11. [PMID: 16732670 DOI: 10.1021/la0602719] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Here, we describe a protocol to bind individual, intact phospholipid bilayer liposomes, which are on the order of 1 microm in diameter, in microwells etched in a regular array on a silicon oxide substrate. The diameter of the wells is on the order of the liposome diameter, so only one liposome is located in each well. The background of the silicon oxide surface is functionalized with a PEG oligomer using the contact printing of a PEG silane to present a surface that resists the adsorption of proteins, lipid material, and liposomes. The interiors of the wells are functionalized with an aminosilane to facilitate the conjugation of biotin, which is then bound to Neutravidin. The avidin-coated well interiors bind the liposomes whose surfaces contain biotinylated lipids. The specific binding of the liposomes to the surface using the biotin-avidin linkage, together with the resistant nature of the background and the physical confinement of the wells, allows the liposomes to remain intact and to not unravel, rupture, and fuse onto the surface. We demonstrate this intact arraying using confocal laser scanning microscopy of fluorophores specifically tagging the microwells, the lipid bilayer, and the aqueous interior of the liposome.
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Affiliation(s)
- Nikhil D Kalyankar
- Department of Chemical Engineering, City University of New York, New York, USA
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36
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Lunelli L, Pasquardini L, Pederzolli C, Vanzetti L, Anderle M. Covalently anchored lipid structures on amine-enriched polystyrene. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:8338-43. [PMID: 16114940 DOI: 10.1021/la050650m] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The study of the adhesion of lipid vesicles on surfaces is of increasing interest in the field of medical implants and tissue engineering (protein-resistant surfaces), drug delivery, biosensors, and biochips. In this work, lipid coverage was developed from PEG-coated vesicles (with sizes from 100 to 300 nm) by covalently binding poly(ethylene glycol)-alpha-disteroylphosphatidylethanolamine-omega-benzotriazole carbonate (DSPE-PEG-BTC) molecules onto the surface amine groups by carbamate chemistry. Lipid surface density and the surface structure of multilamellar (MLVs) and extruded unilamellar (LUVs) vesicles deposited on three types of polystyrene (PS) well-plates were probed by fluorescence and atomic force microscopy (AFM) imaging. A significant difference in the vesicle surface coverage of PS substrates was observed with a substantial increase in lipid multilayers on the amine-enriched PS surface using both unilamellar and multilamellar vesicles.
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Affiliation(s)
- Lorenzo Lunelli
- ITC-irst, Center for Scientific and Technological Research, Sommarive str. 18, 38050 Povo (Trento), Italy.
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Vermette P, Griesser HJ, Kambouris P, Meagher L. Characterization of Surface-Immobilized Layers of Intact Liposomes. Biomacromolecules 2004; 5:1496-502. [PMID: 15244470 DOI: 10.1021/bm049941k] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Surface-immobilized liposome layers are of interest for various potential applications such as localized drug delivery, but their characterization is challenging. We have employed an AFM method and fluorescent dye release to analyze anchored liposomes. In addition, we studied whether the liposomes are surface-bound solely via specific interaction (NeutrAvidin/biotin) or whether physisorptive binding also plays a role. Liposomes containing PEG-biotin lipids were affinity bound to NeutrAvidin molecules which had been immobilized onto solid supports via three different hydrogel interlayers. After liposome docking, approaching the surface with a colloid probe mounted onto an AFM cantilever showed considerable compression behavior, consistent with expectation based on intact, deformable liposomes but not lipid bilayers, thus showing that disruption of liposomes did not occur upon immobilization onto these support surfaces. Plastic deformation suggestive of liposome disruption on compression was not observed. The kinetics of fluorescent dye release also demonstrated that intact liposomes had been successfully immobilized onto all three supports. Blocking surface-immobilized NeutrAvidin molecules with excess biotin in solution before exposure to liposomes showed that the docking of liposomes was dependent largely but not exclusively on biotin-NeutrAvidin affinity binding, with evidence for some nonspecific physisorption, as the extent of liposome binding onto blocked NeutrAvidin surfaces was appreciably lower than for unblocked surfaces but not zero. Finally, consecutive addition of further NeutrAvidin and liposome layers enabled fabrication of multilayers, and this was clearly seen in AFM compressibility and fluorescent dye release measurements.
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Affiliation(s)
- Patrick Vermette
- CSIRO Molecular Science, Bag 10, Clayton South, VIC 3169 Australia.
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Spangenberg T, de Mello NF, Creczynski-Pasa TB, Pasa AA, Niehus H. AFM in-situ characterization of supported phospholipid layers formed by solution spreading. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/pssa.200304368] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Literature Alerts. J Microencapsul 2003. [DOI: 10.3109/02652040309178054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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