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Ishihara K, Shi X, Fukazawa K, Yamaoka T, Yao G, Wu JY. Biomimetic-Engineered Silicone Hydrogel Contact Lens Materials. ACS APPLIED BIO MATERIALS 2023; 6:3600-3616. [PMID: 37616500 PMCID: PMC10521029 DOI: 10.1021/acsabm.3c00296] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 08/16/2023] [Indexed: 08/26/2023]
Abstract
Contact lenses are one of the most successful applications of biomaterials. The chemical structure of the polymers used in contact lenses plays an important role in determining the function of contact lenses. Different types of contact lenses have been developed based on the chemical structure of polymers. When designing contact lenses, materials scientists consider factors such as mechanical properties, processing properties, optical properties, histocompatibility, and antifouling properties, to ensure long-term wear with minimal discomfort. Advances in contact lens materials have addressed traditional issues such as oxygen permeability and biocompatibility, improving overall comfort, and duration of use. For example, silicone hydrogel contact lenses with high oxygen permeability were developed to extend the duration of use. In addition, controlling the surface properties of contact lenses in direct contact with the cornea tissue through surface polymer modification mimics the surface morphology of corneal tissue while maintaining the essential properties of the contact lens, a significant improvement for long-term use and reuse of contact lenses. This review presents the material science elements required for advanced contact lenses of the future and summarizes the chemical methods for achieving these goals.
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Affiliation(s)
- Kazuhiko Ishihara
- Division
of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Xinfeng Shi
- Alcon
Research, LLC, Fort Worth, Texas 76134, United States
| | - Kyoko Fukazawa
- National
Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Tetsuji Yamaoka
- National
Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - George Yao
- Alcon
Research, LLC, Duluth, Georgia 30097, United States
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2
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Li Q, Wang YX, Chen Y. Unraveling Ultrasonic Stress Response of Nanovesicles by the Mechanochromism of Self-Assembled Polydiacetylene. ACS Macro Lett 2022; 11:103-109. [PMID: 35574789 DOI: 10.1021/acsmacrolett.1c00715] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The force response of nanosized vesicles shows substantial applications in drug delivery, cancer therapies, and so on. Conventional methods in mechanical studies on vesicles rely on a camera and an optical microscope, which can hardly work for nanosized particles. Herein, we use self-assembled polydiacetylene (PDA) as a chromic mechanoresponsive group to study the responsiveness of nanovesicles under sonication. The sonication-induced deformation of the PDA backbone and reduction in its conjugation length leads to a color transition from blue to red. Three internal and external factors, including greater shear stress, lower polymerization degree, and higher viscosity of the continue phase, have been found to promote the mechanochromism of the vesicles. These results, for the first time, reveal that the force response of vesicles depends on the actual capillary number (correlated with the three explored factors), even at the nanoscale level, which opens a new avenue to mechanical modulation of nanovesicles for the development of vesicle-based bio- and nanotechniques.
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Affiliation(s)
- Qing Li
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Yi-Xuan Wang
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Yulan Chen
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, People’s Republic of China
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, People’s Republic of China
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3
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Aoki K, Tamaoki N, Seki A, Narazaki K, Takahashi D, Horitsugu K. Synthesis and Properties of Aromatic-Terminated Diacetylene Organogelators and Their Application to Photopatterning of Polydiacetylenes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13160-13169. [PMID: 34706543 DOI: 10.1021/acs.langmuir.1c02420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A series of simply structured diacetylene-diamide-based gelators (DAGs) with aromatic terminals were synthesized, and their gelation and subsequent photopolymerization abilities were analyzed. DAGs with an adequate spacer length (n) and tolyl terminals (DA-Tn) interacted with aromatic solvents, such as benzene and xylenes, at elevated temperatures. During the subsequent cooling process, the DAGs interacted with each other through CH-π interactions at their terminal positions. They also formed one-dimensional hydrogen bonding arrays through secondary amides, leading to stable organogels. These gels polymerized into π-conjugated polydiacetylenes (PDAs) under ultraviolet irradiation. In the p-xylene gels of DA-Tn, the spacer length exerted characteristic odd-even effects on the photopolymerization rates over a certain range (n = 3-6), which can be explained by periodic changes in the uniformity of the molecular packing modes. When the gelling solvent was changed to cyclohexane, the gelation and photopolymerization abilities were greatly improved because the DA-Tn gel networks became highly crystallized and transparent to ultraviolet light (254 nm). The ultimate conversion to PDA from DA-T8/cyclohexane gels was 45.2 wt %. Applying photolithographic techniques to the DAG with excellent photopolymerizability in the film state, we successfully fabricated microscale photopatterns of PDA. We also established a convenient removal process (development process) of DA monomers in unexposed areas. The resulting PDA patterns were quite stable to ambient light stimuli.
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Affiliation(s)
- Ken'ichi Aoki
- Department of Chemistry, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
- Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Nobuyuki Tamaoki
- Research Institute for Electronic Science, Hokkaido University, N20, W10, Kita-Ku, Sapporo 001-0020, Japan
| | - Atsushi Seki
- Department of Chemistry, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
- Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Kenta Narazaki
- Department of Chemistry, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Daiki Takahashi
- Department of Chemistry, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Kousuke Horitsugu
- Department of Chemistry, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
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Gormley CA, Keenan BJ, Buczek-Thomas JA, Pessoa ACSN, Xu J, Monti F, Tabeling P, Holt RG, Nagy JO, Wong JY. Fibrin-Targeted Polymerized Shell Microbubbles as Potential Theranostic Agents for Surgical Adhesions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:10061-10067. [PMID: 30681875 PMCID: PMC6767917 DOI: 10.1021/acs.langmuir.8b03692] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The development of new therapies for surgical adhesions has proven to be difficult as there is no consistently effective way to assess treatment efficacy in clinical trials without performing a second surgery, which can result in additional adhesions. We have developed lipid microbubble formulations that use a short peptide sequence, CREKA, to target fibrin, the molecule that forms nascent adhesions. These targeted polymerized shell microbubbles (PSMs) are designed to allow ultrasound imaging of early adhesions for diagnostic purposes and for evaluating the success of potential treatments in clinical trials while acting as a possible treatment. In this study, we show that CREKA-targeted microbubbles preferentially bind fibrin over fibrinogen and are stable for long periods of time (∼48 h), that these bound microbubbles can be visualized by ultrasound, and that neither these lipid-based bubbles nor their diagnostic-ultrasound-induced vibrations damage mesothelial cells in vitro. Moreover, these bubbles show the potential to identify adhesionlike fibrin formations and may hold promise in blocking or breaking up fibrin formations in vivo.
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Affiliation(s)
- Catherine A. Gormley
- Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, Massachusetts 02215, United States
| | - Benjamin J. Keenan
- Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, Massachusetts 02215, United States
| | - Jo Ann Buczek-Thomas
- Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, Massachusetts 02215, United States
| | - Amanda C. S. N. Pessoa
- Laboratoire de Microfluidique, MEMS et Nanostructures, ESPCI Paris, PSL Research University, Institut Pierre Gilles de Gennes (IPGG), CNRS (CBI), 6 rue Jean Calvin, 75005 Paris, France
- School of Chemical Engineering, University of Campinas, UNICAMP, 500 Av Albert Einstein, 13083-852, Campinas, SP, Brazil
| | - Jiang Xu
- Laboratoire de Microfluidique, MEMS et Nanostructures, ESPCI Paris, PSL Research University, Institut Pierre Gilles de Gennes (IPGG), CNRS (CBI), 6 rue Jean Calvin, 75005 Paris, France
| | - Fabrice Monti
- Laboratoire de Microfluidique, MEMS et Nanostructures, ESPCI Paris, PSL Research University, Institut Pierre Gilles de Gennes (IPGG), CNRS (CBI), 6 rue Jean Calvin, 75005 Paris, France
| | - Patrick Tabeling
- Laboratoire de Microfluidique, MEMS et Nanostructures, ESPCI Paris, PSL Research University, Institut Pierre Gilles de Gennes (IPGG), CNRS (CBI), 6 rue Jean Calvin, 75005 Paris, France
| | - R. Glynn Holt
- Department of Mechanical Engineering, Boston University, 110 Cummington Mall, Boston, Massachusetts 02215, United States
| | - Jon O. Nagy
- NanoValent Pharmaceuticals Inc., 351-B Evergreen Drive, Bozeman, Montana 59715, United States
| | - Joyce Y. Wong
- Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, Massachusetts 02215, United States
- Division of Materials Science and Engineering, Boston University, 15 St. Mary’s Street, Boston, Massachusetts 02215, United States
- Corresponding Author:
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Park Y, Pham TA, Beigie C, Cabodi M, Cleveland RO, Nagy JO, Wong JY. Monodisperse Micro-Oil Droplets Stabilized by Polymerizable Phospholipid Coatings as Potential Drug Carriers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:9762-9770. [PMID: 26303989 DOI: 10.1021/acs.langmuir.5b02747] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
There is a critical need to formulate stable micron-sized oil droplets as hydrophobic drug carriers for efficient drug encapsulation, long-term storage, and sustained drug release. Microfluidic methods were developed to maximize the stability of micron-sized, oil-in-water (o/w) emulsions for potential use in drug delivery, using doxorubicin-loaded triacetin oil as a model hydrophobic drug formulation. Initial experiments examined multiple flow conditions for the dispersed (oil) and continuous (liposome aqueous) phases in a microfluidic device to establish the parameters that influenced droplet size. These data were fit to a mathematical model from the literature and indicate that the droplet sizes formed are controlled by the ratio of flow rates and the height of the device channel, rather than the orifice size. Next, we investigated effects of o/w emulsion production methods on the stability of the droplets. The stability of o/w emulsion produced by microfluidic flow-focusing techniques was found to be much greater (5 h vs 1 h) than for emulsions produced by mechanical agitation (vortexing). The increased droplet stability was attributed to the uniform size and lipid distribution of droplets generated by flow-focusing. In contrast, vortexed populations consisted of a wide size distribution that resulted in a higher prevalence of Ostwald ripening. Finally, the effects of shell polymerization on stability were investigated by comparing oil droplets encapsulated by a photopolymerizable diacetylene lipid shell to those with a nonpolymerizable lipid shell. Shell polymerization was found to significantly enhance stability against dissolution for flow-focused oil droplets but did not significantly affect the stability of vortexed droplets. Overall, results of these experiments show that flow-focusing is a promising technique for generating tunable, stable, monodisperse oil droplet emulsions, with potential applications for controlled delivery of hydrophobic drug formulations.
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Affiliation(s)
| | | | | | | | - Robin O Cleveland
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford , Old Road Campus Research Building, Oxford, OX3 7DQ, United Kingdom
| | - Jon O Nagy
- NanoValent Pharmaceuticals, Inc. , 910 Technology Boulevard STE G, Bozeman, Montana 59718, United States
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6
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Ramakers BEI, Bode SA, Killaars AR, van Hest JCM, Löwik DWPM. Sensing cell adhesion using polydiacetylene-containing peptide amphiphile fibres. J Mater Chem B 2015; 3:2954-2961. [DOI: 10.1039/c4tb02099e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sensing cell adhesion by means of a colourimetric response provides an intuitive measure of cell binding.
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Affiliation(s)
- B. E. I. Ramakers
- Radboud University Nijmegen
- Institute for Molecules and Materials
- Bio-organic Chemistry
- 6525 AJ Nijmegen
- The Netherlands
| | - S. A. Bode
- Radboud University Nijmegen
- Institute for Molecules and Materials
- Bio-organic Chemistry
- 6525 AJ Nijmegen
- The Netherlands
| | - A. R. Killaars
- Radboud University Nijmegen
- Institute for Molecules and Materials
- Bio-organic Chemistry
- 6525 AJ Nijmegen
- The Netherlands
| | - J. C. M. van Hest
- Radboud University Nijmegen
- Institute for Molecules and Materials
- Bio-organic Chemistry
- 6525 AJ Nijmegen
- The Netherlands
| | - D. W. P. M. Löwik
- Radboud University Nijmegen
- Institute for Molecules and Materials
- Bio-organic Chemistry
- 6525 AJ Nijmegen
- The Netherlands
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7
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Oude Blenke E, Mastrobattista E, Schiffelers RM. Strategies for triggered drug release from tumor targeted liposomes. Expert Opin Drug Deliv 2013; 10:1399-410. [DOI: 10.1517/17425247.2013.805742] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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8
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Li L, Rosenthal M, Zhang H, Hernandez JJ, Drechsler M, Phan KH, Rütten S, Zhu X, Ivanov DA, Möller M. Light-Switchable Vesicles from Liquid-Crystalline Homopolymer-Surfactant Complexes. Angew Chem Int Ed Engl 2012; 51:11616-9. [DOI: 10.1002/anie.201205660] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 09/06/2012] [Indexed: 11/08/2022]
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9
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Li L, Rosenthal M, Zhang H, Hernandez JJ, Drechsler M, Phan KH, Rütten S, Zhu X, Ivanov DA, Möller M. Light-Switchable Vesicles from Liquid-Crystalline Homopolymer-Surfactant Complexes. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205660] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Punnamaraju S, You H, Steckl AJ. Triggered release of molecules across droplet interface bilayer lipid membranes using photopolymerizable lipids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7657-64. [PMID: 22548362 DOI: 10.1021/la3011663] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
A combination of nonpolymerizable phospholipids (DPPC or DPhPC) and a smaller amount of cross-linking photopolymerizable phospholipids (23:2 DiynePC) is incorporated in an unsupported artificial lipid bilayer formed using the droplet interface bilayer (DIB) approach. The DIB is formed by contacting lipid monolayer-coated aqueous droplets against each other in a dodecane-lipid medium. Cross-linking of the photopolymerizable lipids incorporated in the DIB was obtained by exposure to UV-C radiation (254 nm), resulting in pore formation. The effect of cross-linking on the DIB properties was characterized optically by measuring the diffusion of selectively encapsulated dye molecules (calcein) from one droplet of the DIB to the other droplet. Changes in DIB conductivity due to UV-C exposure were investigated using current-voltage (I-V) measurements. The leakage of dye molecules across the DIB and the increase in DIB conductivity after UV-C exposure indicates the formation of membrane pores. The results indicate that the DIB approach offers a simple and flexible platform for studying phototriggered drug delivery systems in vitro.
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Affiliation(s)
- S Punnamaraju
- Nanoelectronics Laboratory, University of Cincinnati, Cincinnati, Ohio 45221, USA
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11
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12
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Ramakers BEI, van den Heuvel M, i Spithas NT, Brinkhuis RP, van Hest JCM, Löwik DWPM. Polymerization-induced color changes of polydiacetylene-containing liposomes and peptide amphiphile fibers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2049-2055. [PMID: 22185241 DOI: 10.1021/la203836y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Polydiacetylenes have received much attention due to their intrinsic optical properties. Their inclination to change color in response to environmental factors has been extensively exploited in the sensing of analytes. In this study we functionalized diacetylene-containing peptide amphiphiles and phospholipids with α-bromo esters so that they could be used as initiators in atom transfer radical polymerization (ATRP) reactions. Subsequently, the supramolecular assemblies formed by these molecules upon their addition to water, namely peptide amphiphile fibers and liposomes, were stabilized by polymerizing the diacetylene moieties present in the molecules. As a result, highly colored, disassembly resistant, macro initiators were created. To investigate whether steric crowding on the surface of these assemblies could influence the color of the polydiacetylenes, we utilized the initiator functionality that had been introduced prior to assembly in ATRP. We found that the chromatic properties of the polydiacetylenes were directly related to the formation of polymer on the surface of peptide amphiphile fibers as well as liposomes. Furthermore, we were able to demonstrate that the progress of this color change could be monitored with UV-visible spectroscopy.
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Affiliation(s)
- Britta E I Ramakers
- Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
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13
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Patlolla A, Zunino J, Frenkel AI, Iqbal Z. Thermochromism in polydiacetylene-metal oxide nanocomposites. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm16175c] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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van den Heuvel M, Löwik DWPM, van Hest JCM. Effect of the Diacetylene Position on the Chromatic Properties of Polydiacetylenes from Self-Assembled Peptide Amphiphiles. Biomacromolecules 2010; 11:1676-83. [DOI: 10.1021/bm100376q] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Maaike van den Heuvel
- Institute for Molecules and Materials, Radboud University Nijmegen, Heijendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Dennis W. P. M. Löwik
- Institute for Molecules and Materials, Radboud University Nijmegen, Heijendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Jan C. M. van Hest
- Institute for Molecules and Materials, Radboud University Nijmegen, Heijendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
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15
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Yavlovich A, Singh A, Tarasov S, Capala J, Blumenthal R, Puri A. DESIGN OF LIPOSOMES CONTAINING PHOTOPOLYMERIZABLE PHOSPHOLIPIDS FOR TRIGGERED RELEASE OF CONTENTS. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 2009; 98:97-104. [PMID: 20160877 PMCID: PMC2772073 DOI: 10.1007/s10973-009-0228-8] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We describe a novel class of light-triggerable liposomes prepared from a photo-polymerizable phospholipid DC(8,9)PC (1,2- bis (tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine) and DPPC (1,2-Dipalmitoyl-sn-Glycero-3-Phosphocholine). Exposure to UV (254 nm) radiation for 0-45 minutes at 25 degrees C resulted in photo-polymerization of DC(8,9)PC in these liposomes and the release of an encapsulated fluorescent dye (calcein). Kinetics and extents of calcein release correlated with mol% of DC(8,9)PC in the liposomes. Photopolymerization and calcein release occurred only from DPPC/DC(8,9)PC but not from Egg PC/DC(8,9)PC liposomes. Our data indicate that phase separation and packing of polymerizable lipids in the liposome bilayer are major determinants of photo-activation and triggered contents release.
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Affiliation(s)
- Amichai Yavlovich
- Membrane Structure and Function Section, Nanobiology Program, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
| | - Alok Singh
- Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, D.C
| | - Sergey Tarasov
- Structural Biophysics Laboratory, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
| | - Jacek Capala
- Radiation Oncology Branch, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
| | - Robert Blumenthal
- Membrane Structure and Function Section, Nanobiology Program, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
| | - Anu Puri
- Membrane Structure and Function Section, Nanobiology Program, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
- Correspondence to: Membrane Structure and Function Section, CCRNP, NCI-Frederick, NIH Phone 301 846-5069, FAX: 301 846-6210
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16
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Ma Z, Ren J. Fabrication of stable polydiacetylene vesicles with 2,4-akyl-diacetylenic acid. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2007.03.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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17
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Reppy MA, Pindzola BA. Biosensing with polydiacetylene materials: structures, optical properties and applications. Chem Commun (Camb) 2007:4317-38. [DOI: 10.1039/b703691d] [Citation(s) in RCA: 272] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Polymeric Betaines: Synthesis, Characterization, and Application. SUPRAMOLECULAR POLYMERS POLYMERIC BETAINS OLIGOMERS 2006. [DOI: 10.1007/12_078] [Citation(s) in RCA: 273] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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19
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Polymeric monolayers and liposomes as models for biomembranes. ADVANCES IN POLYMER SCIENCE 2005. [DOI: 10.1007/3-540-13483-2_1] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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20
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Favresse P, Laschewsky A. Synthesis and investigation of new amphiphilic poly(carbobetaine)s made from diallylammonium monomers. POLYMER 2001. [DOI: 10.1016/s0032-3861(00)00686-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Simplified syntheses of polymerizable bis-substituted phosphatidylcholines with various chain lengths. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01537-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Biaxial ordering of terminal diene groups in lipid membranes: an infrared linear dichroism study. J Mol Struct 1999. [DOI: 10.1016/s0022-2860(99)00069-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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23
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Binder H, Anikin A, Kohlstrunk B. Isomerization and Polymerization of Phospholipids with Terminal Diene Groups in Supported Films. J Phys Chem B 1998. [DOI: 10.1021/jp9819083] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H. Binder
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstrasse 5, D-4103 Leipzig, Germany
| | - A. Anikin
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstrasse 5, D-4103 Leipzig, Germany
| | - B. Kohlstrunk
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstrasse 5, D-4103 Leipzig, Germany
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24
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Binder H, Anikin A, Lantzsch G, Klose G. Lyotropic Phase Behavior and Gel State Polymorphism of Phospholipids with Terminal Diene Groups: Infrared Measurements on Molecular Ordering in Lamellar and Hexagonal Phases. J Phys Chem B 1998. [DOI: 10.1021/jp981909v] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H. Binder
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
| | - A. Anikin
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
| | - G. Lantzsch
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
| | - G. Klose
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
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Schrader M, Hofmann UG, Hell SW. Ultrathin fluorescent layers for monitoring the axial resolution in confocal and two-photon fluorescence microscopy. J Microsc 1998; 191:135-140. [PMID: 9767476 DOI: 10.1046/j.1365-2818.1998.00361.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Monomolecular films of polymerized dimethyl-bis[pentacosadiinoic-oxyethyl] ammonium bromide (EDIPAB) provide one- and two-photon excited fluorescence that is sufficiently high to quantify the axial resolution of 3-D fluorescence microscopes. When scanned along the optical axis, the fluorescence of these layers is bright enough to allow online observation of the axial response of these microscopes, thus facilitating alignment and fluorescence throughput control. The layers can be used for directly measuring and monitoring the axial response of 4Pi-confocal microscopes, as well as for their initial alignment and phase adjustment. The proposed technique has the potential to supersede the conventional technique of calculating the derivative of the axial edges of a thick fluorescent layer. Coverslips with EDIPAB-layers can be used as substrates for the cultivation of cells.
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Affiliation(s)
- M Schrader
- High Resolution Optical Microscopy Group, Max-Planck-Institut for Biophysical Chemistry, 37070 Göttingen, Germany
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26
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Koynova R, Caffrey M. Phases and phase transitions of the phosphatidylcholines. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1376:91-145. [PMID: 9666088 DOI: 10.1016/s0304-4157(98)00006-9] [Citation(s) in RCA: 786] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
LIPIDAT (http://www.lipidat.chemistry.ohio-state.edu) is an Internet accessible, computerized relational database providing access to the wealth of information scattered throughout the literature concerning synthetic and biologically derived polar lipid polymorphic and mesomorphic phase behavior and molecular structures. Here, a review of the data subset referring to phosphatidylcholines is presented together with an analysis of these data. This subset represents ca. 60% of all LIPIDAT records. It includes data collected over a 43-year period and consists of 12,208 records obtained from 1573 articles in 106 different journals. An analysis of the data in the subset identifies trends in phosphatidylcholine phase behavior reflecting changes in lipid chain length, unsaturation (number, isomeric type and position of double bonds), asymmetry and branching, type of chain-glycerol linkage (ester, ether, amide), position of chain attachment to the glycerol backbone (1,2- vs. 1,3-) and head group modification. Also included is a summary of the data concerning the effect of pressure, pH, stereochemical purity, and different additives such as salts, saccharides, amino acids and alcohols, on phosphatidylcholine phase behavior. Information on the phase behavior of biologically derived phosphatidylcholines is also presented. This review includes 651 references.
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Affiliation(s)
- R Koynova
- Institute of Biophysics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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27
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Binder H, Gutberlet T, Anikin A, Klose G. Hydration of the dienic lipid dioctadecadienoylphosphatidylcholine in the lamellar phase--an infrared linear dichroism and x-ray study on headgroup orientation, water ordering, and bilayer dimensions. Biophys J 1998; 74:1908-23. [PMID: 9545052 PMCID: PMC1299534 DOI: 10.1016/s0006-3495(98)77900-7] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
In the phospholipid 1,2-bis(2,4-octadecadienoyl)-sn-glycero-3-phosphorylcholine (DODPC) in each of the fatty acid chains, a rigid diene group is inserted in a position near the polar/apolar boundary that is exceptionally sensitive for membrane stability. DODPC transforms upon gradual dehydration from the liquid-crystalline to a metastable gel state, which rearranges into two subgel phases at low and intermediate degrees of hydration. The molecular dimensions of the respective bilayers were determined by means of x-ray diffraction. Infrared linear dichroism of selected vibrations of the phosphate and trimethylammonium groups and of the nu13(OH) band of water adsorbed onto the lipid was used to study the molecular order in the polar part of the bilayers in macroscopically oriented samples. The dense packing of the tilted acyl chains in the subgel causes the in-plane orientation of the phosphatidylcholine headgroups with direct interactions between the phosphate and trimethylammonium groups, and a strong orientation of adsorbed water molecules. In the more disordered gel, the thickness of the polar part of the bilayer increases and the lateral interactions between the lipid headgroups weaken. The higher order in the headgroup region of the subgels correlates with shorter decay lengths of the repulsive forces acting between opposite membrane surfaces. This result can be understood if the work to dehydrate the lipid is determined to a certain degree by the work to break up the lipid-water interactions without compensation by adequate lipid-lipid contacts. Almost similar area compressibility moduli are found in the liquid-crystalline and solid phases. Obviously, the lipid avoids lateral stress by the structural rearrangement.
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Affiliation(s)
- H Binder
- Universität Leipzig, Institut für Experimentelle Physik I, Germany.
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28
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Binder H, Anikin A, Kohlstrunk B, Klose G. Hydration-Induced Gel States of the Dienic Lipid 1,2-Bis(2,4-octadecadienoyl)-sn-glycero-3-phosphorylcholine and Their Characterization Using Infrared Spectroscopy. J Phys Chem B 1997. [DOI: 10.1021/jp9706893] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H. Binder
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
| | - A. Anikin
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
| | - B. Kohlstrunk
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
| | - G. Klose
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
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29
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30
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AFM-Investigation of the molecular structure of films from a polymerizable two-chain lipid. Chem Phys Lipids 1994. [DOI: 10.1016/0009-3084(94)90175-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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31
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Affiliation(s)
- F Paltauf
- Institut für Biochemie und Lebensmittelchemie der Technischen Universität Graz, Austria
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32
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Abstract
LIPIDAT is a computerized database providing access to the wealth of information scattered throughout the literature concerning synthetic and biologically derived polar lipid polymorphic and mesomorphic phase behavior. Here, a review of the LIPIDAT data subset referring to hydrated phosphatidylethanolamines (PE) is presented together with an analysis of these data. The PE subset represents 14% of all LIPIDAT records. It includes data collected over a 38-year period and consists of 1511 records obtained from 203 articles in 35 different journals. An analysis of the data in the subset has allowed us to identify trends in synthetic PE phase behavior reflecting changes in lipid chain length, chain unsaturation (number, isomeric type and position of double bonds), chain asymmetry and branching, type of chain-glycerol linkage (ether vs. ester) and headgroup modification. Also included is a summary of the data concerning the effect of pH, stereochemical purity, and different additives such as salts, saccharides, alcohols, amino adds and alkanes on PE phase behavior. Information on the phase behavior of biologically derived PE is also presented. This review includes 236 references.
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Affiliation(s)
- R Koynova
- Department of Chemistry, Ohio State University, Columbus 43210-1173
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33
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Borle F, Michel H, Sigrist H. Phospholipid polymerization and reconstitution of bacteriorhodopsin in photopolymerizable lipid vesicles. J Memb Sci 1992. [DOI: 10.1016/0376-7388(92)80053-m] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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34
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Davies DE, Critchlow M, Grainger DW, Reichert A, Ringsdorf H, Lloyd JB. Small unilamellar liposomes from mixed natural and polymeric phospholipids: stability and susceptibility to phospholipase A2. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1084:29-34. [PMID: 2054375 DOI: 10.1016/0005-2760(91)90051-i] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The concept of the uncorkable liposome composed of phase-separated mixtures of a polymerized phospholipid and an enzymically digestible phospholipid has been investigated, using small unilamellar vesicles composed of mixtures of (polymerized) dienoylphosphatidylcholine (DENPC) and dimyristoylphosphatidylcholine (DMPC). Mixed liposomes, even those containing only 10% DENPC, were much more stable than DMPC liposomes, as indicated by the release of entrapped [3H]inulin or [14C]glucose. DMPC liposomes released entrapped solute on exposure to phospholipase A2, whereas mixed vesicles were resistant. The results are compared with those of an earlier study on monolayers of similar compositions. It is concluded that the liposomes, like the monolayers, are phase-mixed, and that uncorkable liposomes cannot be constructed from the phospholipid mixture employed. It is proposed that, until further experimental evidence is produced, the enzymatically uncorkable liposome must be regarded as a theoretical construct.
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Affiliation(s)
- D E Davies
- Department of Biological Sciences, Keele University, Staffordshire, U.K
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35
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Lundahl P, Yang Q. Liposome chromatography: liposomes immobilized in gel beads as a stationary phase for aqueous column chromatography. J Chromatogr A 1991; 544:283-304. [PMID: 1885691 DOI: 10.1016/s0021-9673(01)83992-3] [Citation(s) in RCA: 63] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Liposomes have been used as a stationary phase for column chromatography with an aqueous mobile phase. They were immobilized in the pores of carrier gel beads by two methods: (A) hydrophobic ligands were coupled to the matrix of gel beads, which then were packed into a column and liposomes were applied and became associated with the ligands by hydrophobic interaction; and (B) phospholipids and detergent were dialysed in the presence of gel beads; many of the liposomes that formed in the pores of the beads were sterically immobilized by the gel matrix. Proteoliposomes containing red cell glucose transport protein in the lipid bilayers were immobilized in a column by method A. This column retained D-glucose longer than L-glucose. In contrast to L-glucose, D-glucose was transported into and out of the immobilized liposomes, causing an increased retention. Liposomes with (stearylamine)+ or (phosphatidylserine)- in their lipid bilayers were immobilized by method B and the gel beads were packed into a column. A protein of opposite charge was applied in excess. Under suitable conditions, the protein molecules became close-packed on the liposome surfaces. Ion-exchange chromatographic experiments with proteins showed that these sterically immobilized liposomes were also stable enough to be used as a stationary phase. The loss of lipids was 5-23% in the first run at high protein load and with sodium chloride gradient elution but was lower in subsequent runs. It is proposed that water-soluble molecules can be separated and their interactions with liposome surfaces studied by chromatography on immobilized liposomes in detergent-free aqueous solution. Membrane proteins can be inserted and ligands can be anchored in the lipid bilayers for chromatographic purposes.
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Affiliation(s)
- P Lundahl
- Department of Biochemistry, University of Uppsala, Sweden
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36
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Abstract
Polymerizable lipids have received considerable attention in the last ten years as polymerization of lipids in vesicle systems is a possibility to increase the stability of lipid bilayers. Lipids with various polymerizable groups have been synthesized in the last years. This paper is focussed on those lipids which are closely related to natural phospholipids, i.e. molecules which have two hydrophobic chains and a head group containing a phosphate moiety. The phase behaviour of polymerizable phospholipids as lipid monomers and in the polymerized state is reviewed and discussed.
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Affiliation(s)
- A Blume
- Fachbereich Chemie, Universität Kaiserslautern, F.R.G
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37
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Caffrey M, Hogan J, Rudolph AS. Diacetylenic lipid microstructures: structural characterization by X-ray diffraction and comparison with the saturated phosphatidylcholine analogue. Biochemistry 1991; 30:2134-46. [PMID: 1998674 DOI: 10.1021/bi00222a018] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Thermotropic and lyotropic mesomorphism in the polymerizable lecithin 1,2-ditricosa-10,12-diynoyl-sn-glycero-3-phosphocholine and its saturated analogue, 1,2-ditricosanoyl-sn-glycero-3-phosphocholine, has been investigated by wide- and low-angle X-ray diffraction of both powder and oriented samples and by differential scanning calorimetry. Previous studies have shown that the hydrated diacetylenic lipid forms novel microstructures (tubules and stacked bilayer sheets) in its low-temperature phase. The diffraction results indicate that at low temperatures fully hydrated tubules and sheets have an identical lamellar repeat size (d001 = 66.4 A) and crystalline-like packing of the acyl chains. Chain packing in the lamellar crystalline phase is hydration independent. A model for the polymerizable lecithin with (1) fully extended all-trans methylene segments, (2) a long-axis tilt of 32 degrees, and (3) minimal chain interdigitation seems most reasonable on energetic grounds, is consistent with the diffraction data (to 3.93-A resolution), and is likely to support facile polymerization. Above the chain "melting" transition the lamellar repeat of the polymerizable lipid increases to 74 A. The conformational similarity between tubules, sheets, and the dry powder is corroborated by calorimetry, which reveals a cooling exotherm at the same temperature where tubules form upon cooling hydrated sheets. The data suggest that although a high degree of conformational order is a pertinent feature of tubules, this character alone is not sufficient to account for tubule formation. The conformation of the corresponding saturated phosphatidylcholine appears to be similar to that of other saturated phosphatidylcholines in the lamellar gel phase. Furthermore, above the main transition temperature, the dry, saturated lipid shows evidence of a P delta phase (112 degrees C), whereas the diacetylenic lipid appears to exhibit a centered rectangular phase, R alpha (55 degrees C).
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Affiliation(s)
- M Caffrey
- Department of Chemistry, Ohio State University, Columbus 43210
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38
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Abstract
Egg-yolk phospholipid vesicles (liposomes) containing stearylamine cations or phosphatidylserine anions, were formed and entrapped in agarose gel beads (Sepharose 6B) by a dialysis procedure. On a column of entrapped phospholipid-stearylamine (4:1) (cationic) vesicles, 0.36 mg of ferritin was bound per mumol lipids at 0.05 M ionic strength and pH 7. About 30% of the vesicle surface thus became covered with ferritin. Only 0.04 mg of citraconylated myoglobin was bound per mumol lipids, as myoglobin is much smaller than ferritin. Haeme groups were readily inserted into the lipid bilayers. An excess amount of bovine serum albumin (BSA) or ribonuclease A was applied to entrapped ionic vesicles and the bound proteins were eluted by increasing the ionic strength from 0.01 to 0.2 or 0.5 M. After three to five runs, 82-88% of the vesicles (the phospholipids) remained entrapped. The capacity of the cationic vesicle-column for BSA decreased more than did the amount of entrapped vesicles, which indicates a preferential loss of stearylamine. Ion-exchange experiments were done with human plasma and with BSA monomers and dimers on entrapped cationic vesicles. Plasma proteins could be separated. BSA dimers were eluted later than BSA monomers in a sodium chloride gradient and the separation was better than on DEAE-Sepharose. The contact area between the protein and the vesicle surface is important for the binding strength. Protein-vesicle surface interactions can be studied by chromatography on entrapped vesicles.
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Affiliation(s)
- Q Yang
- Department of Biochemistry, University of Uppsala, Sweden
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39
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Rudolph AS, Calvert JM, Schoen PE, Schnur JM. Technological development of lipid based tubule microstructures. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1988; 238:305-20. [PMID: 3074640 DOI: 10.1007/978-1-4684-7908-9_24] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- A S Rudolph
- Naval Research Laboratory, Washington, DC 20375-5000
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40
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Ringsdorf H, Schlarb B, Venzmer J. Molekulare Architektur und Funktion von polymeren orientierten Systemen – Modelle für das Studium von Organisation, Oberflächenerkennung und Dynamik bei Biomembranen. Angew Chem Int Ed Engl 1988. [DOI: 10.1002/ange.19881000111] [Citation(s) in RCA: 314] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Yuasa M, Yamamoto K, Nishide H, Tsuchida E. The Infrared Spectrum of Dioxygen Bound to the Synthetic Porphinatoiron in an Aqueous Medium. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1988. [DOI: 10.1246/bcsj.61.313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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42
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Ohno H, Takeoka S, Tsuchida E. Unequivalent Chemical Environment of Diene Groups in 1- and 2-Acyl Chains of Polymerizable Lipids Analyzed by Radical Polymerization. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1987. [DOI: 10.1246/bcsj.60.2945] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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43
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Yuasa M, Tani Y, Nishide H, Tsuchida E. Stabilization effect of tocopherol and catalase on the life-time of liposome-embedded heme as an oxygen carrier. BIOCHIMICA ET BIOPHYSICA ACTA 1987; 900:160-2. [PMID: 3593708 DOI: 10.1016/0005-2736(87)90288-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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44
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Polymerizable lipid analogues of diacetylenic phosphonic acids. Synthesis, spreading behaviour and polymerization at the gas-water interface. Chem Phys Lipids 1986. [DOI: 10.1016/0009-3084(86)90026-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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45
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46
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Rabe JP, Rabolt JF, Brown CA, Swalen JD. Order–disorder transitions in Langmuir–Blodgett films. II. IR studies of the polymerization of Cd–octadecylfumarate and Cd–octadecylmaleate. J Chem Phys 1986. [DOI: 10.1063/1.450073] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Hayward JA, Levine DM, Neufeld L, Simon SR, Johnston DS, Chapman D. Polymerized liposomes as stable oxygen-carriers. FEBS Lett 1985; 187:261-6. [PMID: 4018263 DOI: 10.1016/0014-5793(85)81255-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We have produced a surrogate erythrocyte ('hemosomes') by encapsulating human hemoglobin in polymerized vesicles composed of diacetylenic phospholipids plus or minus cholesterol. Hemoglobin (in the presence or absence of allosteric effectors) was encapsulated by a freeze-thaw method in large, unilamellar vesicles composed of monomeric lipids. Entrapment was demonstrated by molecular-sieve chromatography. Brief irradiation with ultraviolet light produced polymeric hemosomes with polymerization kinetics and conversions similar to liposomes in the absence of protein. Photo-induced oxidation of the heme was eliminated or severely limited by a combination of prior ligation with CO and the maintenance of high intravesicular hemoglobin concentrations (5-10 mM internal hemoglobin). The inclusion of allosteric effectors within polymerized hemosomes facilitated near-quantitative conversion to the oxy-HbA form. Gas permeability of monomeric and polymeric hemosomes was demonstrated by spectroscopic methods. Reversible spectral shifts, corresponding to oxygenation-deoxygenation, were obtained after brief evacuation and exposure to oxygen or nitrogen. The gas permeability of polymerized hemosomes appears sufficient for the vesicles to act as oxygen carriers in vivo, a notion that is strengthened by their apparent hemocompatibility.
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48
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Tieke B. Polymerization of butadiene and butadiyne (diacetylene) derivatives in layer structures. ADVANCES IN POLYMER SCIENCE 1985. [DOI: 10.1007/3-540-15482-5_8] [Citation(s) in RCA: 114] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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