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A conjugated polymer‐liposome complex: A contiguous water‐stable, electronic, and optical interface. VIEW 2020. [DOI: 10.1002/viw.20200081] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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2
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Hassoun S, Karam P. Fluorescent-Based Thermal Sensing in Lipid Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1221-1226. [PMID: 31941281 DOI: 10.1021/acs.langmuir.9b03128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Thermal mapping in biological membranes could unlock and help us understand many chemical and physical processes that do not only pertain to localized membrane phenomena but also extend to many other intra- and extracellular pathways. In this manuscript, we report the development of a ratiometric thermal fluorescent probe based on the Förster resonance energy transfer between a lipid-embedded conjugated polyelectrolyte and a lyophilic acceptor dye. We showed that the Förster resonance energy transfer (FRET) pair is sensitive within the relevant physiological temperature window (20.0-50.0 °C). The signal was also shielded from an external pH and stable when cycled multiple times. The probe was also sensitive to the membrane composition and could, therefore, be further developed to probe the membrane composition and viscosity.
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Affiliation(s)
- Sarriah Hassoun
- Chemistry Department , American University of Beirut , P.O. Box 11-0236, Riad El-Solh , 1107 2020 Beirut , Lebanon
| | - Pierre Karam
- Chemistry Department , American University of Beirut , P.O. Box 11-0236, Riad El-Solh , 1107 2020 Beirut , Lebanon
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3
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Yassine SR, Hassoun SA, Karam P. Fluorescent thermal sensing using conjugated polyelectrolytes in thin polymer films. Anal Chim Acta 2019; 1077:249-254. [PMID: 31307716 DOI: 10.1016/j.aca.2019.05.046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Revised: 04/20/2019] [Accepted: 05/20/2019] [Indexed: 01/23/2023]
Abstract
Thermal sensing in thin films polymers has been a significant limitation towards optimizing the heat dissipation in micro- and nano-electronic devices as well as many other thin film-based technologies. In this work, we report on poly (phenylene ethynylene) fluorescent-based conjugated polyelectrolyte capable of detecting thermal fluctuations in polymer films prepared from polyvinylpyrrolidone-co-vinyl acetate. The sensor was first optimized in solution by testing two polyvinylpyrrolidone (PVP) copolymers (co-vinyl acetate (VA) and co-polystyrene (PS)) before it was spun cast onto quartz slides and imaged using a DSLR camera at different temperatures. The images were analyzed and showed a change in color with the increase in temperature. When not illuminated, the polymer thin film is clear and transparent.
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Affiliation(s)
- Sarah R Yassine
- Chemistry Department, American University of Beirut, P.O.Box 11-0236, Riad El-Solh, 1107 2020, Beirut, Lebanon
| | - Sarriah A Hassoun
- Chemistry Department, American University of Beirut, P.O.Box 11-0236, Riad El-Solh, 1107 2020, Beirut, Lebanon
| | - Pierre Karam
- Chemistry Department, American University of Beirut, P.O.Box 11-0236, Riad El-Solh, 1107 2020, Beirut, Lebanon.
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4
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Zeglio E, Rutz AL, Winkler TE, Malliaras GG, Herland A. Conjugated Polymers for Assessing and Controlling Biological Functions. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806712. [PMID: 30861237 DOI: 10.1002/adma.201806712] [Citation(s) in RCA: 91] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 01/15/2019] [Indexed: 05/20/2023]
Abstract
The field of organic bioelectronics is advancing rapidly in the development of materials and devices to precisely monitor and control biological signals. Electronics and biology can interact on multiple levels: organs, complex tissues, cells, cell membranes, proteins, and even small molecules. Compared to traditional electronic materials such as metals and inorganic semiconductors, conjugated polymers (CPs) have several key advantages for biological interactions: tunable physiochemical properties, adjustable form factors, and mixed conductivity (ionic and electronic). Herein, the use of CPs in five biologically oriented research topics, electrophysiology, tissue engineering, drug release, biosensing, and molecular bioelectronics, is discussed. In electrophysiology, implantable devices with CP coating or CP-only electrodes are showing improvements in signal performance and tissue interfaces. CP-based scaffolds supply highly favorable static or even dynamic interfaces for tissue engineering. CPs also enable delivery of drugs through a variety of mechanisms and form factors. For biosensing, CPs offer new possibilities to incorporate biological sensing elements in a conducting matrix. Molecular bioelectronics is today used to incorporate (opto)electronic functions in living tissue. Under each topic, the limits of the utility of CPs are discussed and, overall, the major challenges toward implementation of CPs and their devices to real-world applications are highlighted.
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Affiliation(s)
- Erica Zeglio
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW, 2052, Australia
- Department of Micro and Nanosystems, KTH Royal Institute of Technology, 10044, Stockholm, Sweden
| | - Alexandra L Rutz
- Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Ave., Cambridge, CB3 0FA, UK
| | - Thomas E Winkler
- Department of Micro and Nanosystems, KTH Royal Institute of Technology, 10044, Stockholm, Sweden
| | - George G Malliaras
- Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Ave., Cambridge, CB3 0FA, UK
| | - Anna Herland
- Department of Micro and Nanosystems, KTH Royal Institute of Technology, 10044, Stockholm, Sweden
- Swedish Medical Nanoscience Center, Department of Neuroscience, Karolinska Institute, 17177, Stockholm, Sweden
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5
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Tsuchiya Y, Nakaya T, Kakigi T, Sugikawa K, Ikeda A. Adsorption of tetrakis(4-sulfophenyl)porphyrin onto liposomal surfaces composed of neutral diacylphosphatidylcholine and release by cyclodextrin. RSC Adv 2018; 8:11930-11934. [PMID: 35539372 PMCID: PMC9079261 DOI: 10.1039/c8ra01411f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 03/20/2018] [Indexed: 12/26/2022] Open
Abstract
Anionic tetrakis(4-sulfophenyl)porphyrin (TPPS) interacts with liposomal surfaces composed of neutral diacylphosphatidylcholine at high lipid concentrations. TPPS interacted with liposomal surfaces through four contact points. The association constant was obtained to be 9.0 × 105 M−4. TPPS was peeled off the liposomal surfaces by the addition of cyclodextrin. Interactions between tetrakis(4-sulfophenyl)porphyrin and liposomal surfaces with neutral diacylphosphatidylcholine occurred and can be controlled by the addition of cyclodextrin.![]()
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Affiliation(s)
- Yuki Tsuchiya
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Toshimi Nakaya
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Tomoyuki Kakigi
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Kouta Sugikawa
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Atsushi Ikeda
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
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6
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Abou Matar T, Karam P. The Role of Hydrophobicity in the Cellular Uptake of Negatively Charged Macromolecules. Macromol Biosci 2017; 18. [DOI: 10.1002/mabi.201700309] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/09/2017] [Indexed: 12/18/2022]
Affiliation(s)
- Tamara Abou Matar
- Department of Chemistry; American University of Beirut; P.O. Box 11-0236 Beirut Lebanon
| | - Pierre Karam
- Department of Chemistry; American University of Beirut; P.O. Box 11-0236 Beirut Lebanon
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7
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Ivashkov OV, Sybachin AV, Efimova AA, Orlov VN, Pergushov DV, Schmalz H, Yaroslavov AA. Composition and properties of complexes between anionic liposomes and diblock copolymers with cationic and poly(ethylene oxide) blocks. POLYM INT 2017. [DOI: 10.1002/pi.5431] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Oleg V Ivashkov
- Department of Chemistry; MV Lomonosov Moscow State University; Moscow Russia
| | - Andrey V Sybachin
- Department of Chemistry; MV Lomonosov Moscow State University; Moscow Russia
| | - Anna A Efimova
- Department of Chemistry; MV Lomonosov Moscow State University; Moscow Russia
| | - Viktor N Orlov
- Research Institute of Physico-Chemical Biology; MV Lomonosov Moscow State University; Moscow Russia
| | - Dmitry V Pergushov
- Department of Chemistry; MV Lomonosov Moscow State University; Moscow Russia
| | - Holger Schmalz
- Makromolekulare Chemie II; Universität Bayreuth; Bayreuth Germany
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8
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Darwish GH, Fakih HH, Karam P. Temperature Mapping in Hydrogel Matrices Using Unmodified Digital Camera. J Phys Chem B 2017; 121:1033-1040. [DOI: 10.1021/acs.jpcb.6b11844] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Ghinwa H. Darwish
- Department of Chemistry, American University of Beirut, P.O.
Box 11-0236, Beirut 1107 2020, Lebanon
| | - Hassan H. Fakih
- Department of Chemistry, American University of Beirut, P.O.
Box 11-0236, Beirut 1107 2020, Lebanon
| | - Pierre Karam
- Department of Chemistry, American University of Beirut, P.O.
Box 11-0236, Beirut 1107 2020, Lebanon
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Calver CF, Lago BA, Schanze KS, Cosa G. Enhancing the photostability of poly(phenylene ethynylene) for single particle studies. Photochem Photobiol Sci 2017; 16:1821-1831. [DOI: 10.1039/c7pp00276a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Enhanced photostability of conjugated polyelectrolytes achieved by using anti-fading agents opens the way for advanced single molecule fluorescence imaging studies.
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Affiliation(s)
- C. F. Calver
- Department of Chemistry and Centre for Self-Assembled Chemical Structures (CSACS/CRMAA)
- McGill University
- Montreal
- Canada
| | - B. A. Lago
- Department of Chemistry and Centre for Self-Assembled Chemical Structures (CSACS/CRMAA)
- McGill University
- Montreal
- Canada
| | - K. S. Schanze
- Department of Chemistry
- University of Texas at San Antonio
- San Antonio
- USA
| | - G. Cosa
- Department of Chemistry and Centre for Self-Assembled Chemical Structures (CSACS/CRMAA)
- McGill University
- Montreal
- Canada
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10
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Calver CF, Schanze KS, Cosa G. Biomimetic Light-Harvesting Antenna Based on the Self-Assembly of Conjugated Polyelectrolytes Embedded within Lipid Membranes. ACS NANO 2016; 10:10598-10605. [PMID: 27934088 DOI: 10.1021/acsnano.6b07111] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Here we report a biomimetic light-harvesting antenna based on negatively charged poly(phenylene ethynylene) conjugated polyelectrolytes assembled within a positively charged lipid membrane scaffold constructed by the lipid 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP). Light harvested by the polymers was transferred via through-space mechanisms to a lipophilic energy acceptor (the cyanine dye DiI) whose effective molar absorption was enhanced by up to 18-fold due to the antenna effect. Absorption amplification of DiI was found to be due primarily to direct energy transfer from polymers. The efficiency of homoenergy transfer among polymers was next probed by the membrane embedding fullerene derivative phenyl-C61-butryic acid methyl ester (PCBM) acting as an electron acceptor. PCBM was able to quench the emission of up to five polymers, consistent with a modest amount of homotransfer. The ability of the membrane to accommodate a high density of polymer donors without self-quenching was crucial to the success of electronic energy harvesting achieved. This work highlights the potential of lipid membranes as a platform to organize light-harvesting molecules on the nanoscale toward achieving efficient energy transfer to a target chromophore/trap.
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Affiliation(s)
- Christina F Calver
- Department of Chemistry and Centre for Self-Assembled Chemical Structures (CSACS/CRMAA), McGill University , 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
| | - Kirk S Schanze
- Department of Chemistry, University of Texas at San Antonio , One UTSA Way, San Antonio, Texas 78023, United States
| | - Gonzalo Cosa
- Department of Chemistry and Centre for Self-Assembled Chemical Structures (CSACS/CRMAA), McGill University , 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
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11
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Campos EV, Oliveira JL, Zavala-Betancourt SA, Ledezma AS, Arias E, Moggio I, Romero J, Fraceto LF. Development of stained polymeric nanocapsules loaded with model drugs: Use of a fluorescent poly(phenyleneethynylene). Colloids Surf B Biointerfaces 2016; 147:442-449. [DOI: 10.1016/j.colsurfb.2016.08.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 07/26/2016] [Accepted: 08/19/2016] [Indexed: 12/26/2022]
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12
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Houston JE, Kraft M, Mooney I, Terry AE, Scherf U, Evans RC. Charge-Mediated Localization of Conjugated Polythiophenes in Zwitterionic Model Cell Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8141-8153. [PMID: 27434827 DOI: 10.1021/acs.langmuir.6b01828] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The selective engineering of conjugated polyelectrolyte (CPE)-phospholipid interfaces is poised to play a key role in the design of advanced biomedical and biotechnological devices. Herein, we report a strategic study to investigate the relationship between the charge of the CPE side group and their association with zwitterionic phospholipid bilayers. The interaction of dipalmitoylphosphatidylcholine (DPPC) phospholipid vesicles with a series of poly(thiophene)s bearing zwitterionic, cationic, or anionic terminal groups (P3Zwit, P3TMAHT and P3Anionic, respectively) has been probed. Although all CPEs showed an affinity for the zwitterionic vesicles, the calculated partition coefficients determined using photoluminescence spectroscopy suggested preferential incorporation within the lipid bilayer in the order P3Zwit > P3Anionic ≫ P3TMAHT. The polarity probe Prodan was used to further qualify the position of the CPE inside the vesicle bilayers via Förster resonance energy transfer (FRET) studies. The varying proximity of the CPEs to Prodan was reflected in the Stern-Volmer quenching constants and decreased in the order P3Anionic > P3TMAHT ≫ P3Zwit. Dynamic light scattering measurements showed an increase in the hydrodynamic diameter of the DPPC vesicles upon addition of each poly(thiophene), but to the greatest extent for P3Anionic. Small-angle neutron scattering studies also revealed that P3Anionic specifically increased the thickness of the headgroup region of the phospholipid bilayer. Epifluorescence and atomic force microscopy imaging showed that P3TMAHT formed amorphous agglomerates on the vesicle surface, P3Zwit was buried throughout the bilayer, and P3Anionic formed a shell of protruding chains around the surface, which promoted vesicle fusion. The global data indicate three distinctive modes of interaction for the poly(thiophene)s within DPPC vesicles, whereby the nature of the association is ultimately controlled by the pendant charge group on each CPE chain. Our results suggest that charge-mediated self-assembly may provide a simple and effective route to design luminescent CPE probes capable of specific localization within phospholipid membranes.
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Affiliation(s)
- Judith E Houston
- School of Chemistry and CRANN, University of Dublin, Trinity College , College Green, Dublin 2, Ireland
| | - Mario Kraft
- Macromolecular Chemistry Group (Buwmakro) and Institute for Polymer Technology, Bergische Universität Wuppertal , Gauss-Str. 20, D-42119 Wuppertal, Germany
| | - Ian Mooney
- School of Chemistry and CRANN, University of Dublin, Trinity College , College Green, Dublin 2, Ireland
| | - Ann E Terry
- ISIS, STFC, Rutherford Appleton Laboratory, Didcot, Oxon OX11 0QX, U.K
| | - Ullrich Scherf
- Macromolecular Chemistry Group (Buwmakro) and Institute for Polymer Technology, Bergische Universität Wuppertal , Gauss-Str. 20, D-42119 Wuppertal, Germany
| | - Rachel C Evans
- School of Chemistry and CRANN, University of Dublin, Trinity College , College Green, Dublin 2, Ireland
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Draffehn S, Eichhorst J, Wiesner B, Kumke MU. Insight into the Modification of Polymeric Micellar and Liposomal Nanocarriers by Fluorescein-Labeled Lipids and Uptake-Mediating Lipopeptides. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6928-6939. [PMID: 27295095 DOI: 10.1021/acs.langmuir.6b01487] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Encapsulation of diagnostic and therapeutic compounds in transporters improves their delivery to the point of need. An even more efficient treatment of diseases can be achieved using carriers with targeting or protecting moieties. In the present work, we investigated micellar and liposomal nanocarriers modified with fluorescein, peptides, and polymers that are covalently bound to fatty acids or phospholipids to ensure a self-driven incorporation into the micelles or liposomes. First, we characterized the photophysics of the fluorescent probes in the absence and in the presence of nanocarriers. Changes in the fluorescence decay time, quantum yield, and intensity of a fluorescein-labeled fatty acid (fluorescein-labeled palmitic acid [fPA]) and a fluorescein-labeled lipopeptide (P2fA2) were found. By exploiting these changes, we investigated a lipopeptide (P2A2 as an uptake-mediating unit) in combination with different nanocarriers (micelles and liposomes) and determined the corresponding association constant Kass values, which were found to be very high. In addition, the mobility of fPA was exploited using fluorescence correlation spectroscopy (FCS) and fluorescence depolarization (FD) experiments to characterize the nanocarriers. Cellular uptake experiments with mouse brain endothelial cells provided information on the uptake behavior of liposomes modified by uptake-mediating P2A2 and revealed differences in the uptake behavior between pH-sensitive and pH-insensitive liposomes.
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Affiliation(s)
- Sören Draffehn
- Department of Physical Chemistry, University of Potsdam , Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
| | - Jenny Eichhorst
- Department of Cellular Imaging, Leibniz Institut für Molekulare Pharmakologie (FMP) , Robert-Roessle-Str. 10, 13125 Berlin, Germany
| | - Burkhard Wiesner
- Department of Cellular Imaging, Leibniz Institut für Molekulare Pharmakologie (FMP) , Robert-Roessle-Str. 10, 13125 Berlin, Germany
| | - Michael U Kumke
- Department of Physical Chemistry, University of Potsdam , Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
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14
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Chen Z, Wu P, Cong R, Xu N, Tan Y, Tan C, Jiang Y. Sensitive Conjugated-Polymer-Based Fluorescent ATP Probes and Their Application in Cell Imaging. ACS APPLIED MATERIALS & INTERFACES 2016; 8:3567-74. [PMID: 26393287 DOI: 10.1021/acsami.5b06935] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Three cationic conjugated polyelectrolytes (CPEs) with a common poly(p-phenylene ethynylene terthiophene) backbone and side chains of different lengths, named as PPET3-N1, PPET3-N2, and PPET3-N3, were designed and synthesized. The UV-vis absorption and fluorescence spectra of the polymers vary strongly with solvent composition, suggesting that the polymers are strongly aggregated in H2O. In addition, the spectroscopic properties of the polymers are affected by small-molecule ATP, characterized by significant fluorescence intensity decreases and red shifts of their absorption bands. Further application of these polymers in cell imaging was studied by confocal fluorescence microscopy, which demonstrated that all of the polymers were localized on the cell membrane and partially inside of cells and that the staining effect gradually increased with the length of the polymer side chains. On the basis of the low cytotoxicity and efficient quenching of PPET3-N2 by ATP, the dose and time effects of ATP on PPET3-N2 imaging were studied, and the results indicated that this polymer might have potential in cell imaging for ATP semiquantification in vivo.
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Affiliation(s)
- Zhifang Chen
- Department of Chemistry, Tsinghua University , Beijing 100084, P. R. China
- The Ministry-Province Jointly Constructed Base for State Key Lab, Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, P. R. China
| | - Pan Wu
- Department of Chemistry, Tsinghua University , Beijing 100084, P. R. China
- The Ministry-Province Jointly Constructed Base for State Key Lab, Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, P. R. China
| | - Rong Cong
- Cranbrook Kingswood Upper School , Bloomfield Hills, Michigan 48304, United States
| | - Naihan Xu
- The Ministry-Province Jointly Constructed Base for State Key Lab, Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, P. R. China
| | - Ying Tan
- The Ministry-Province Jointly Constructed Base for State Key Lab, Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, P. R. China
| | - Chunyan Tan
- Department of Chemistry, Tsinghua University , Beijing 100084, P. R. China
- The Ministry-Province Jointly Constructed Base for State Key Lab, Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, P. R. China
| | - Yuyang Jiang
- The Ministry-Province Jointly Constructed Base for State Key Lab, Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, P. R. China
- Department of Pharmacology and Pharmaceutical Sciences, School of Medicine, Tsinghua University , Beijing 100084, P. R. China
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15
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Darwish GH, Abouzeid J, Karam P. Tunable nanothermometer based on short poly(phenylene ethynylene). RSC Adv 2016. [DOI: 10.1039/c6ra14828j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report a self-referencing ratiometric nanothermometer based on short conjugated polyelectrolytes (CPEs).
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Affiliation(s)
| | - Jihane Abouzeid
- Department of Chemistry
- American University of Beirut
- Beirut
- Lebanon
| | - Pierre Karam
- Department of Chemistry
- American University of Beirut
- Beirut
- Lebanon
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16
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Darwish GH, Koubeissi A, Shoker T, Abou Shaheen S, Karam P. Turning the heat on conjugated polyelectrolytes: an off–on ratiometric nanothermometer. Chem Commun (Camb) 2016; 52:823-6. [DOI: 10.1039/c5cc08541a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A ratiometric single component nanothermometer fluorescent probe.
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Affiliation(s)
| | - Ali Koubeissi
- The Department of Chemistry
- American University of Beirut
- Lebanon
| | | | | | - Pierre Karam
- The Department of Chemistry
- American University of Beirut
- Lebanon
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17
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Calver CF, Liu HW, Cosa G. Exploiting Conjugated Polyelectrolyte Photophysics toward Monitoring Real-Time Lipid Membrane-Surface Interaction Dynamics at the Single-Particle Level. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11842-11850. [PMID: 25955885 DOI: 10.1021/acs.langmuir.5b00979] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Herein we report the real-time observation of the interaction dynamics between cationic liposomes flowing in solution and a surface-immobilized charged scaffolding formed by the deposition of conjugated polyanion poly[5-methoxy-2-(3-sulfopropoxy)-1,4-phenylenevinylene (MPS-PPV) onto 100-nm-diameter SiO2 nanoparticles (NPs). Contact of the freely floating liposomes with the polymer-coated surfaces led to the formation of supported lipid bilayers (SLBs). The interaction of the incoming liposomes with MPS-PPV adsorbed on individual SiO2 nanoparticles promoted the deaggregation of the polymer conformation and led to large emission intensity enhancements. Single-particle total internal reflection fluorescence microscopy studies exploited this phenomenon as a way to monitor the deformation dynamics of liposomes on surface-immobilized NPs. The MPS-PPV emission enhancement (up to 25-fold) reflected on the extent of membrane contact with the surface of the NP and was correlated with the size of the incoming liposome. The time required for the MPS-PPV emission to reach a maximum (ranging from 400 to 1000 ms) revealed the dynamics of membrane deformation and was also correlated with the liposome size. Cryo-TEM experiments complemented these results by yielding a structural view of the process. Immediately following the mixing of liposomes and NPs the majority of NPs had one or more adsorbed liposomes, yet the presence of a fully formed SLB was rare. Prolonged incubation of liposomes and NPs showed completely formed SLBs on all of the NPs, confirming that the liposomes eventually ruptured to form SLBs. We foresee that the single-particle studies we report herein may be readily extended to study membrane dynamics of other lipids including cellular membranes in live cell studies and to monitor the formation of polymer-cushioned SLBs.
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Affiliation(s)
- Christina F Calver
- Department of Chemistry and Centre for Self Assembled Chemical Structures (CSACS/CRMAA), McGill University , 801 Sherbrooke Street West, Montreal, QC H3A 0B8, Canada
| | - Hsiao-Wei Liu
- Department of Chemistry and Centre for Self Assembled Chemical Structures (CSACS/CRMAA), McGill University , 801 Sherbrooke Street West, Montreal, QC H3A 0B8, Canada
| | - Gonzalo Cosa
- Department of Chemistry and Centre for Self Assembled Chemical Structures (CSACS/CRMAA), McGill University , 801 Sherbrooke Street West, Montreal, QC H3A 0B8, Canada
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Darwish GH, Karam P. Nanohybrid conjugated polyelectrolytes: highly photostable and ultrabright nanoparticles. NANOSCALE 2015; 7:15149-15158. [PMID: 26255590 DOI: 10.1039/c5nr03299g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present a general and straightforward one-step approach to enhance the photophysical properties of conjugated polyelectrolytes. Upon complexation with an amphiphilic polymer (polyvinylpyrrolidone), an anionic conjugated polyelectrolyte (poly[5-methoxy-2-(3-sulfopropoxy)-1,4-phenylenevinylene]) was prepared into small nanoparticles with exceptional photostability and brightness. The polymer fluorescence intensity was enhanced by 23 -fold and could be easily tuned by changing the order of addition. Single molecule experiments revealed a complete suppression of blinking. In addition, after only losing 18% of the original intensity, a remarkable amount of photons were emitted per particle (∼10(9), on average). This number is many folds greater than popular organic fluorescent dyes. We believe that an intimate contact between the two polymers is shielding the conjugated polyelectrolyte from the destructive photooxidation. The prepared nanohybrid particles will prove instrumental in single particle based fluorescent assays and can serve as a probe for the current state-of-the-art bioimaging fluorescence techniques.
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Affiliation(s)
- Ghinwa H Darwish
- Department of Chemistry, American University of Beirut, P.O. Box 11-0236, Beirut, Lebanon.
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Poongavanam MV, Kisley L, Kourentzi K, Landes CF, Willson RC. Ensemble and single-molecule biophysical characterization of D17.4 DNA aptamer-IgE interactions. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1864:154-64. [PMID: 26307469 DOI: 10.1016/j.bbapap.2015.08.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 08/09/2015] [Accepted: 08/18/2015] [Indexed: 12/12/2022]
Abstract
BACKGROUND The IgE-binding DNA aptamer 17.4 is known to inhibit the interaction of IgE with the high-affinity IgE Fc receptor FcεRI. While this and other aptamers have been widely used and studied, there has been relatively little investigation of the kinetics and energetics of their interactions with their targets, by either single-molecule or ensemble methods. METHODS The dissociation kinetics of the D17.4/IgE complex and the effects of temperature and ionic strength were studied using fluorescence anisotropy and single-molecule spectroscopy, and activation parameters calculated. RESULTS The dissociation of D17.4/IgE complex showed a strong dependence on temperature and salt concentration. The koff of D17.4/IgE complex was calculated to be (2.92±0.18)×10(-3) s(-1) at 50 mM NaCl, and (1.44±0.02)×10(-2) s(-1) at 300 mM NaCl, both in 1 mM MgCl2 and 25°C. The dissociation activation energy for the D17.4/IgE complex, Ea, was 16.0±1.9 kcal mol(-1) at 50 mM NaCl and 1 mM MgCl2. Interestingly, we found that the C19A mutant of D17.4 with stabilized stem structure showed slower dissociation kinetics compared to D17.4. Single-molecule observations of surface-immobilized D17.4/IgE showed much faster dissociation kinetics, and heterogeneity not observable by ensemble techniques. CONCLUSIONS The increasing koff value with increasing salt concentration is attributed to the electrostatic interactions between D17.4/IgE. We found that both the changes in activation enthalpy and activation entropy are insignificant with increasing NaCl concentration. The slower dissociation of the mutant C19A/IgE complex is likely due to the enhanced stability of the aptamer. GENERAL SIGNIFICANCE The activation parameters obtained by applying transition state analysis to kinetic data can provide details on mechanisms of molecular recognition and have applications in drug design. Single-molecule dissociation kinetics showed greater kinetic complexity than was observed in the ensemble in-solution systems, potentially reflecting conformational heterogeneity of the aptamer. This article is part of a Special Issue entitled: Physiological Enzymology and Protein Functions.
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Affiliation(s)
| | - Lydia Kisley
- Department of Chemistry, Rice University, Houston, TX77005-1827, USA
| | - Katerina Kourentzi
- Department of Chemical and Biomolecular Engineering, University of Houston, TX 77204-4004, USA
| | - Christy F Landes
- Department of Chemistry, Rice University, Houston, TX77005-1827, USA; Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005-1827, USA.
| | - Richard C Willson
- Department of Biology and Biochemistry, University of Houston, TX 77204-5001, USA; Department of Chemical and Biomolecular Engineering, University of Houston, TX 77204-4004, USA; Houston Methodist Research Institute, Houston, TX 77030, USA; Centro de Biotecnología FEMSA, Departamento de Biotecnología e Ingeniería de Alimentos, Tecnológico de Monterrey, Monterrey 64849, Mexico.
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Bender M, Seehafer K, Findt M, Bunz UHF. Pyridine-based poly(aryleneethynylene)s: a study on anionic side chain density and their influence on optical properties and metallochromicity. RSC Adv 2015. [DOI: 10.1039/c5ra21829b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report the Pd-catalyzed synthesis of six new water soluble, alternating poly(p-phenylene-ethynylene-p-pyridinylene-ethynylene) (abcb-alternating) copolymers and one poly(p-pyridinyleneethynylene).
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Affiliation(s)
- Markus Bender
- Organisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Kai Seehafer
- Organisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Marlene Findt
- Organisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Uwe H. F. Bunz
- Organisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
- CAM
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