51
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Peng B, Ding XY, Sun C, Yang YN, Gao YJ, Zhao X. The chain order of binary unsaturated lipid bilayers modulated by aromatic-residue-containing peptides: an ATR-FTIR spectroscopy study. RSC Adv 2017. [DOI: 10.1039/c7ra01145h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
It highlights the importance of aromatic residues in influencing peptide binding to the membrane, demonstrates that the stability of the membranes depends on the lipid composition and the sequence, structural context, and orientation of the peptides.
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Affiliation(s)
- Bo Peng
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - Xiao-Yan Ding
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - Chao Sun
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - Ya-Nan Yang
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - Yu-Jiao Gao
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - Xin Zhao
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
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52
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Kniggendorf AK, Nogueira R, Kelb C, Schadzek P, Meinhardt-Wollweber M, Ngezahayo A, Roth B. Confocal Raman microscopy and fluorescent in situ hybridization - A complementary approach for biofilm analysis. CHEMOSPHERE 2016; 161:112-118. [PMID: 27423128 DOI: 10.1016/j.chemosphere.2016.06.096] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 06/24/2016] [Accepted: 06/25/2016] [Indexed: 06/06/2023]
Abstract
We combine confocal Raman microscopy (CRM) of wet samples with subsequent Fluorescent in situ hybridization (FISH) without significant limitations to either technique for analyzing the same sample of a microbial community on a cell-to-cell basis. This combination of techniques allows a much deeper, more complete understanding of complex environmental samples than provided by either technique alone. The minimalistic approach is based on laboratory glassware with micro-engravings for reproducible localization of the sample at cell scale combined with a fixation and de- and rehydration protocol for the respective techniques. As proof of concept, we analyzed a floc of nitrifying activated sludge, demonstrating that the sample can be tracked with cell-scale precision over different measurements and instruments. The collected information includes the microbial content, spatial shape, variant chemical compositions of the floc matrix and the mineral microparticles embedded within. In addition, the direct comparison of CRM and FISH revealed a difference in reported cell size due to the different cell components targeted by the respective technique. To the best of our knowledge, this is the first report of a direct cell-to-cell comparison of confocal Raman microscopy and Fluorescent in situ hybridization analysis performed on the same sample. An adaptation of the method to include native samples as a starting point is planned for the near future. The micro-engraving approach itself also opens up the possibility of combining other, functionally incompatible techniques as required for further in-depth investigations of low-volume samples.
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Affiliation(s)
- Ann-Kathrin Kniggendorf
- Hannover Centre for Optical Technologies, Gottfried-Wilhelm-Leibniz Universität Hannover, Nienburger Str. 2, 30167 Hannover, Germany.
| | - Regina Nogueira
- Institut für Siedlungswasserwirtschaft und Abfalltechnik, Gottfried-Wilhelm-Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany.
| | - Christian Kelb
- Hannover Centre for Optical Technologies, Gottfried-Wilhelm-Leibniz Universität Hannover, Nienburger Str. 2, 30167 Hannover, Germany.
| | - Patrik Schadzek
- Institute for Biophysics, Gottfried-Wilhelm-Leibniz Universität Hannover, Herrenhäuser Str. 2, 30149 Hannover, Germany.
| | - Merve Meinhardt-Wollweber
- Hannover Centre for Optical Technologies, Gottfried-Wilhelm-Leibniz Universität Hannover, Nienburger Str. 2, 30167 Hannover, Germany.
| | - Anaclet Ngezahayo
- Institute for Biophysics, Gottfried-Wilhelm-Leibniz Universität Hannover, Herrenhäuser Str. 2, 30149 Hannover, Germany.
| | - Bernhard Roth
- Hannover Centre for Optical Technologies, Gottfried-Wilhelm-Leibniz Universität Hannover, Nienburger Str. 2, 30167 Hannover, Germany.
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53
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Wright AJ, Richens JL, Bramble JP, Cathcart N, Kitaev V, O'Shea P, Hudson AJ. Surface-enhanced Raman scattering measurement from a lipid bilayer encapsulating a single decahedral nanoparticle mediated by an optical trap. NANOSCALE 2016; 8:16395-16404. [PMID: 27722713 DOI: 10.1039/c6nr05616d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a new technique for the study of model membranes on the length-scale of a single nano-sized liposome. Silver decahedral nanoparticles have been encapsulated by a model unilamellar lipid bilayer creating nano-sized lipid vesicles. The metal core has two roles (i) increasing the polarizability of vesicles, enabling a single vesicle to be isolated and confined in an optical trap, and (ii) enhancing Raman scattering from the bilayer, via the high surface-plasmon field at the sharp vertices of the decahedral particles. Combined this has allowed us to measure a Raman fingerprint from a single vesicle of 50 nm-diameter, containing just ∼104 lipid molecules in a bilayer membrane over a surface area of <0.01 μm2, equivalent to a volume of approximately 1 zepto-litre. Raman scattering is a weak and inefficient process and previous studies have required either a substantially larger bilayer area in order to obtain a detectable signal, or the tagging of lipid molecules with a chromophore to provide an indirect probe of the bilayer. Our approach is fully label-free and bio-compatible and, in the future, it will enable much more localized studies of the heterogeneous structure of lipid bilayers and of membrane-bound components than is currently possible.
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Affiliation(s)
- A J Wright
- Department of Electrical and Electronic Engineering, University of Nottingham, Nottingham, NG7 2RD, UK.
| | - J L Richens
- Faculty of Pharmaceutical Sciences, 2405 Wesbrook Mall, Vancouver, BC Canada, V6T 1Z3
| | - J P Bramble
- Faculty of Pharmaceutical Sciences, 2405 Wesbrook Mall, Vancouver, BC Canada, V6T 1Z3
| | - N Cathcart
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
| | - V Kitaev
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
| | - P O'Shea
- Faculty of Pharmaceutical Sciences, 2405 Wesbrook Mall, Vancouver, BC Canada, V6T 1Z3
| | - A J Hudson
- Department of Chemistry, University of Leicester, Leicester, LE1 7RH, UK
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54
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Kitt JP, Harris JM. Confocal Raman Microscopy of Hybrid-Supported Phospholipid Bilayers within Individual C18-Functionalized Chromatographic Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9033-9044. [PMID: 27493032 DOI: 10.1021/acs.langmuir.6b02309] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Measuring lipid-membrane partitioning of small molecules is critical to predicting bioavailability and investigating molecule-membrane interactions. A stable model membrane for such studies has been developed through assembly of a phospholipid monolayer on n-alkane-modified surfaces. These hybrid bilayers have recently been generated within n-alkyl-chain (C18)-modified porous silica and used in chromatographic retention studies of small molecules. Despite their successful application, determining the structure of hybrid bilayers within chromatographic silica is challenging because they reside at buried interfaces within the porous structure. In this work, we employ confocal Raman microscopy to investigate the formation and temperature-dependent structure of hybrid-phospholipid bilayers in C18-modified, porous-silica chromatographic particles. Porous silica provides sufficient surface area within a confocal probe volume centered in an individual particle to readily measure, with Raman microscopy, the formation of an ordered hybrid bilayer of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) with the surface C18 chains. The DMPC surface density was quantified from the relative Raman scattering intensities of C18 and phospholipid acyl chains and found to be ∼40% of a DMPC vesicle membrane. By monitoring Raman spectra acquired versus temperature, the bilayer main phase transition was observed to be broadened and shifted to higher temperature compared to a DMPC vesicle, in agreement with differential scanning calorimetry (DSC) results. Raman scattering of deuterated phospholipid was resolved from protonated C18 chain scattering, showing that the lipid acyl and C18 chains melt simultaneously in a single phase transition. The surface density of lipid in the hybrid bilayer, the ordering of both C18 and lipid acyl chains upon bilayer formation, and decoupling of C18 methylene C-H vibrations by deuterated lipid acyl chains all suggest an interdigitated acyl chain structure. The simultaneous melting of both layers is also consistent with an interdigitated structure, where immobility of surface-grafted C18 chains decreases the cooperativity and increases the melting temperature compared to a vesicle bilayer.
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Affiliation(s)
- Jay P Kitt
- Department of Chemistry, University of Utah , 315 South 1400 East, Salt Lake City, Utah 84112-0850, United States
| | - Joel M Harris
- Department of Chemistry, University of Utah , 315 South 1400 East, Salt Lake City, Utah 84112-0850, United States
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55
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Manrique-Moreno M, Heinbockel L, Suwalsky M, Garidel P, Brandenburg K. Biophysical study of the non-steroidal anti-inflammatory drugs (NSAID) ibuprofen, naproxen and diclofenac with phosphatidylserine bilayer membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2123-2131. [DOI: 10.1016/j.bbamem.2016.06.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 05/19/2016] [Accepted: 06/10/2016] [Indexed: 11/27/2022]
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56
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Effect of Different Broad Waveband Lights on Membrane Lipids of a Cyanobacterium, Synechococcus sp., as Determined by UPLC-QToF-MS and Vibrational Spectroscopy. BIOLOGY 2016; 5:biology5020022. [PMID: 27223306 PMCID: PMC4929536 DOI: 10.3390/biology5020022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 05/17/2016] [Accepted: 05/18/2016] [Indexed: 11/17/2022]
Abstract
Differential profile of membrane lipids and pigments of a Synechococcus sp. cyanobacterial strain cells exposed to blue, green, red and white light are determined by means of liquid chromatography and mass spectrometry or diode array detection. Raman and ATR-IR spectra of intact cells under the diverse light wavebands are also reported. Blue light cells exhibited an increased content of photosynthetic pigments as well as specific species of membrane glycerolipids as compared to cells exposed to other wavebands. The A630/A680 ratio indicated an increased content of phycobilisomes (PBS) in the blue light-exposed cells. Some differences in the protein conformation between the four light waveband-exposed cells were deduced from the variable absorbance at specific wavenumbers in the FT-Raman and ATR-FTIR spectra, in particular bands assigned to amide I and amide II. Bands from 1180 to 950 cm(-1) in the ATR-FTIR spectrum suggest degraded outer membrane polysaccharide in the blue light-exposed cells.
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57
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Insights into the interaction of the N-terminal amyloidogenic polypeptide of ApoA-I with model cellular membranes. Biochim Biophys Acta Gen Subj 2016; 1860:795-801. [DOI: 10.1016/j.bbagen.2016.01.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 12/27/2015] [Accepted: 01/06/2016] [Indexed: 01/23/2023]
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58
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Marianecci C, Di Marzio L, Del Favero E, Cantù L, Brocca P, Rondelli V, Rinaldi F, Dini L, Serra A, Decuzzi P, Celia C, Paolino D, Fresta M, Carafa M. Niosomes as Drug Nanovectors: Multiscale pH-Dependent Structural Response. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1241-9. [PMID: 26740247 DOI: 10.1021/acs.langmuir.5b04111] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The use of nanocarriers, which respond to different stimuli controlling their physicochemical properties and biological responsivness, shows a growing interest in pharmaceutical science. The stimuli are activated by targeting tissues and biological compartments, e.g., pH modification, temperature, redox condition, enzymatic activity, or can be physically applied, e.g., a magnetic field and ultrasound. pH modification represents the easiest method of passive targeting, which is actually used to accumulate nanocarriers in cells and tissues. The aim of this paper was to physicochemically characterize pH-sensitive niosomes using different experimental conditions and demonstrate the effect of surfactant composition on the supramolecular structure of niosomes. In this attempt, niosomes, made from commercial (Tween21) and synthetic surfactants (Tween20 derivatives), were physicochemically characterized by using different techniques, e.g., transmission electron microscopy, Raman spectroscopy, and small-angle X-ray scattering. The changes of niosome structure at different pHs depend on surfactants, which can affect the supramolecular structure of colloidal nanocarriers and their potential use both in vitro and in vivo. At pH 7.4, the shape and structure of niosomes have been maintained; however, niosomes show some differences in terms of bilayer thicknesses, water penetration, membrane coupling, and cholesterol dispersion. The acid pH (5.5) can increase the bilayer fluidity, and affect the cholesterol depletion. In fact, Tween21 niosomes form large vesicles with lower curvature radius at acid pH; while Tween20-derivative niosomes increase the intrachain mobility within a more interchain correlated membrane. These results demonstrate that the use of multiple physicochemical procedures provides more information about supramolecular structures of niosomes and improves the opportunity to deeply investigate the effect of stimuli responsiveness on the niosome structure.
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Affiliation(s)
- Carlotta Marianecci
- Department of Drug Chemistry and Technology, University of Rome "Sapienza" , 00185 Rome, Italy
| | - Luisa Di Marzio
- Department of Pharmacy, University of Chieti - Pescara "G d'Annunzio" , 66100 Chieti - Pescara, Italy
| | - Elena Del Favero
- Department of Medical Biotechnologies and Traslational Medicine, University of Milan , LITA, 20122 Milan, Italy
| | - Laura Cantù
- Department of Medical Biotechnologies and Traslational Medicine, University of Milan , LITA, 20122 Milan, Italy
| | - Paola Brocca
- Department of Medical Biotechnologies and Traslational Medicine, University of Milan , LITA, 20122 Milan, Italy
| | - Valeria Rondelli
- Department of Medical Biotechnologies and Traslational Medicine, University of Milan , LITA, 20122 Milan, Italy
| | - Federica Rinaldi
- Center for Life Nano Science@Sapienza, Fondazione Istituto Italiano di Tecnologia , 00197 Rome, Italy
| | - Luciana Dini
- Department of Biological and Environmental Sciences and Technologies, University of Salento , 73100 Lecce, Italy
| | - Antonio Serra
- Department of Physics Applied to Materials Science Laboratory (PAMS-Lab), University of Salento , 73100 Lecce, Italy
| | - Paolo Decuzzi
- Department of Translational Imaging, Houston Methodist Research Institute , Houston, Texas 77030, United States
- Department of Drug Discovery and Development, Fondazione Istituto Italiano di Tecnologia , 16163 Genoa, Italy
- Department of Experimental and Clinical Medicine, University of Catanzaro "Magna Græcia" , 88100 Catanzaro, Italy
| | - Christian Celia
- Department of Pharmacy, University of Chieti - Pescara "G d'Annunzio" , 66100 Chieti - Pescara, Italy
- Department of Nanomedicine, Houston Methodist Research Institute , Houston, Texas 77030, United States
| | - Donatella Paolino
- Department of Experimental and Clinical Medicine, University of Catanzaro "Magna Græcia" , 88100 Catanzaro, Italy
- IRC FSH-Interregional Research Center for Food Safety & Health, University of Catanzaro "Magna Græcia" , 88100 Catanzaro, Italy
| | - Massimo Fresta
- IRC FSH-Interregional Research Center for Food Safety & Health, University of Catanzaro "Magna Græcia" , 88100 Catanzaro, Italy
- Department of Health Sciences, University of Catanzaro "Magna Græcia" , 88100 Catanzaro, Italy
| | - Maria Carafa
- Department of Drug Chemistry and Technology, University of Rome "Sapienza" , 00185 Rome, Italy
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59
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Hobro AJ, Kumagai Y, Akira S, Smith NI. Raman spectroscopy as a tool for label-free lymphocyte cell line discrimination. Analyst 2016; 141:3756-64. [DOI: 10.1039/c6an00181e] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Raman spectroscopy can be used to discriminate between morphologically similar lymphocyte cell classes and cell lines.
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Affiliation(s)
- Alison J. Hobro
- Biophotonics Laboratory
- Immunology Frontier Research Center
- Osaka University
- Osaka
- Japan
| | - Yutaro Kumagai
- Quantitative Immunology Research Unit
- Immunology Frontier Research Center
- Osaka University
- Osaka
- Japan
| | - Shizuo Akira
- Host Defense Laboratory
- Immunology Frontier Research Center
- Osaka University
- Osaka
- Japan
| | - Nicholas I. Smith
- Biophotonics Laboratory
- Immunology Frontier Research Center
- Osaka University
- Osaka
- Japan
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60
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Peng B, Ding XY, Sun C, Liu W, Zhang JZH, Zhao X. The effect of POPC acyl chains packing by aromatic amino acid methyl esters investigated by ATR-FTIR combined with QM calculations. RSC Adv 2016. [DOI: 10.1039/c6ra05903a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The packing of POPC acyl chains can be influenced by aromatic amino acid methyl esters significantly, thus the HCCH motif is packed closed to the other one of an adjacent acyl chain with enhancement by dispersion interactions.
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Affiliation(s)
- Bo Peng
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - Xiao-Yan Ding
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - Chao Sun
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - Wei Liu
- State Key Laboratory of Precision Spectroscopy
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - John Z. H. Zhang
- State Key Laboratory of Precision Spectroscopy
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
| | - Xin Zhao
- Shanghai Key Laboratory of Magnetic Resonance
- Department of Physics
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
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61
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Dmitriev AA, Surovtsev NV. Temperature-Dependent Hydrocarbon Chain Disorder in Phosphatidylcholine Bilayers Studied by Raman Spectroscopy. J Phys Chem B 2015; 119:15613-22. [DOI: 10.1021/acs.jpcb.5b07502] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. A. Dmitriev
- Novosibirsk State University, Novosibirsk, 630090, Russia
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62
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Cong X, Poyton MF, Baxter AJ, Pullanchery S, Cremer PS. Unquenchable Surface Potential Dramatically Enhances Cu(2+) Binding to Phosphatidylserine Lipids. J Am Chem Soc 2015; 137:7785-92. [PMID: 26065920 DOI: 10.1021/jacs.5b03313] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein, the apparent equilibrium dissociation constant, K(Dapp), between Cu(2+) and 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-l-serine (POPS), a negatively charged phospholipid, was measured as a function of PS concentrations in supported lipid bilayers (SLBs). The results indicated that K(Dapp) for Cu(2+) binding to PS-containing SLBs was enhanced by a factor of 17,000 from 110 nM to 6.4 pM as the PS density in the membrane was increased from 1.0 to 20 mol %. Although Cu(2+) bound bivalently to POPS at higher PS concentrations, this was not the dominant factor in increasing the binding affinity. Rather, the higher concentration of Cu(2+) within the double layer above the membrane was largely responsible for the tightening. Unlike the binding of other divalent metal ions such as Ca(2+) and Mg(2+) to PS, Cu(2+) binding does not alter the net negative charge on the membrane as the Cu(PS)2 complex forms. As such, the Cu(2+) concentration within the double layer region was greatly amplified relative to its concentration in bulk solution as the PS density was increased. This created a far larger enhancement to the apparent binding affinity than is observed by standard multivalent effects. These findings should help provide an understanding on the extent of Cu(2+)-PS binding in cell membranes, which may be relevant to biological processes such as amyloid-β peptide toxicity and lipid oxidation.
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63
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Zito G, Rusciano G, Pesce G, Dochshanov A, Sasso A. Surface-enhanced Raman imaging of cell membrane by a highly homogeneous and isotropic silver nanostructure. NANOSCALE 2015; 7:8593-606. [PMID: 25898990 DOI: 10.1039/c5nr01341k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Label-free chemical imaging of live cell membranes can shed light on the molecular basis of cell membrane functionalities and their alterations under membrane-related diseases. In principle, this can be done by surface-enhanced Raman scattering (SERS) in confocal microscopy, but requires engineering plasmonic architectures with a spatially invariant SERS enhancement factor G(x, y) = G. To this end, we exploit a self-assembled isotropic nanostructure with characteristics of homogeneity typical of the so-called near-hyperuniform disorder. The resulting highly dense, homogeneous and isotropic random pattern consists of clusters of silver nanoparticles with limited size dispersion. This nanostructure brings together several advantages: very large hot spot density (∼10(4) μm(-2)), superior spatial reproducibility (SD < 1% over 2500 μm(2)) and single-molecule sensitivity (Gav ∼ 10(9)), all on a centimeter scale transparent active area. We are able to reconstruct the label-free SERS-based chemical map of live cell membranes with confocal resolution. In particular, SERS imaging is here demonstrated on red blood cells in vitro in order to use the Raman-resonant heme of the cell as a contrast medium to prove spectroscopic detection of membrane molecules. Numerical simulations also clarify the SERS characteristics of the substrate in terms of electromagnetic enhancement and distance sensitivity range consistently with the experiments. The large SERS-active area is intended for multi-cellular imaging on the same substrate, which is important for spectroscopic comparative analysis of complex organisms like cells. This opens new routes for in situ quantitative surface analysis and dynamic probing of living cells exposed to membrane-targeting drugs.
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Affiliation(s)
- Gianluigi Zito
- Department of Physics, University of Naples Federico II, via Cintia, 80126-I Naples, Italy.
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64
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Lőrincz A, Mihály J, Németh C, Wacha A, Bóta A. Effects of ursolic acid on the structural and morphological behaviours of dipalmitoyl lecithin vesicles. BIOCHIMICA ET BIOPHYSICA ACTA 2015; 1848:1092-8. [PMID: 25620772 DOI: 10.1016/j.bbamem.2015.01.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 11/12/2014] [Accepted: 01/12/2015] [Indexed: 01/08/2023]
Abstract
Effects of ursolic acid on the structural and morphological characteristics of dipalmitoyl lecithin(DPPC)-water system was studied by using differential scanning calorimetry (DSC), small- and wide-angle X-ray scattering (SWAXS), freeze-fracture method combined with transmission electron-microscopy (FF-TEM) and infrared spectroscopy (FT-IR). The surface of the uncorrelated lipid system is rippled or grained and a huge number of small, presumably unilamellar vesicles are present if the UA/DPPC molar ratio is 0.1 mol/mol or higher. Besides the destroyed layer packing of regular multilamellar vesicles, non-bilayer (e.g. cubic or hexagonal) local structures are evidenced by SAXS and FF-TEM methods. The ability of UA to induce non-bilayer structures in hydrated DPPC system originates from the actual geometry form of associated lipid and UA molecules as concluded from the FT-IR measurements and theoretical calculations. Beside numerous beneficial e.g. chemopreventive and chemotherapeutic effect of ursolic acid against cancer, their impact to modify the lipid bilayers can be utilized in liposomal formulations.
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Affiliation(s)
- András Lőrincz
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Research Group of Biological Nanochemistry, 1117 Budapest, Magyar tudósok körútja 2, Hungary
| | - Judith Mihály
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Research Group of Biological Nanochemistry, 1117 Budapest, Magyar tudósok körútja 2, Hungary
| | - Csaba Németh
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Research Group of Biological Nanochemistry, 1117 Budapest, Magyar tudósok körútja 2, Hungary
| | - András Wacha
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Research Group of Biological Nanochemistry, 1117 Budapest, Magyar tudósok körútja 2, Hungary
| | - Attila Bóta
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Research Group of Biological Nanochemistry, 1117 Budapest, Magyar tudósok körútja 2, Hungary.
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65
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Petrus J, Czarnik-Matusewicz B, Petrus R, Cieślik-Boczula K, Jaszczyszyn A, Gąsiorowski K. Fluphenazine: From an isolated molecule to its interaction with lipid bilayers. Chem Phys Lipids 2015; 186:51-60. [DOI: 10.1016/j.chemphyslip.2015.01.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 01/10/2015] [Accepted: 01/12/2015] [Indexed: 12/11/2022]
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66
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Near-real-time analysis of the phenotypic responses of Escherichia coli to 1-butanol exposure using Raman Spectroscopy. J Bacteriol 2014; 196:3983-91. [PMID: 25157078 DOI: 10.1128/jb.01590-14] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Raman spectroscopy was used to study the time course of phenotypic responses of Escherichia coli (DH5α) to 1-butanol exposure (1.2% [vol/vol]). Raman spectroscopy is of interest for bacterial phenotyping because it can be performed (i) in near real time, (ii) with minimal sample preparation (label-free), and (iii) with minimal spectral interference from water. Traditional off-line analytical methodologies were applied to both 1-butanol-treated and control cells to draw correlations with Raman data. Here, distinct sets of Raman bands are presented that characterize phenotypic traits of E. coli with maximized correlation to off-line measurements. In addition, the observed time course phenotypic responses of E. coli to 1.2% (vol/vol) 1-butanol exposure included the following: (i) decreased saturated fatty acids levels, (ii) retention of unsaturated fatty acids and low levels of cyclopropane fatty acids, (iii) increased membrane fluidity following the initial response of increased rigidity, and (iv) no changes in total protein content or protein-derived amino acid composition. For most phenotypic traits, correlation coefficients between Raman spectroscopy and traditional off-line analytical approaches exceeded 0.75, and major trends were captured. The results suggest that near-real-time Raman spectroscopy is suitable for approximating metabolic and physiological phenotyping of bacterial cells subjected to toxic environmental conditions.
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67
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Agomelatine strongly interacts with zwitterionic DPPC and charged DPPG membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:2798-806. [PMID: 25091390 DOI: 10.1016/j.bbamem.2014.07.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 07/07/2014] [Accepted: 07/25/2014] [Indexed: 01/01/2023]
Abstract
Depression is one of the most common psychiatric diseases in the population. Agomelatine is a novel antidepressant drug with melatonin receptor agonistic and serotonin 5-HT2C antagonistic properties. Furthermore, being a melatonergic drug, agomelatine has the potential of being used in therapeutic applications like melatonin as an antioxidant, anti-inflammatory and antiapoptotic drug. The action mechanism of agomelatine on the membrane structure has not been clarified yet. In the present study, we aimed to investigate the interaction of agomelatine with model membranes of dipalmitoylphosphatidylcholine (DPPC) and dipalmitoylphosphatidylgylcerol (DPPG) by Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC). We found that agomelatine interacts with the head group in such a manner that it destabilizes the membrane architecture to a large extent. Thus, agomelatine causes alterations in the order, packing and dynamics of the DPPC and DPPG model membranes. Our results suggest that agomelatine strongly interacts with zwitterionic and charged membrane phospholipids. Because lipid structure and dynamics may have influence on the structure of membrane bound proteins and affect the signal transduction systems of membranes, these effects of agomelatine may be important in its action mechanism.
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68
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Kühler P, Weber M, Lohmüller T. Plasmonic nanoantenna arrays for surface-enhanced Raman spectroscopy of lipid molecules embedded in a bilayer membrane. ACS APPLIED MATERIALS & INTERFACES 2014; 6:8947-8952. [PMID: 24896979 DOI: 10.1021/am5023418] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We demonstrate a strategy for surface-enhanced Raman spectroscopy (SERS) of supported lipid membranes with arrays of plasmonic nanoantennas. Colloidal lithography refined with plasma etching is used to synthesize arrays of triangular shaped gold nanoparticles. Reducing the separation distance between the triangle tips leads to plasmonic coupling and to a strong enhancement of the electromagnetic field in the nanotriangle gap. As a result, the Raman scattering intensity of molecules that are located at this plasmonic "hot-spot" can be increased by several orders of magnitude. The nanoantenna array is then embedded with a supported phospholipid membrane which is fluid at room temperature and spans the antenna gap. This configuration offers the advantage that molecules that are mobile within the bilayer membrane can enter the "hot-spot" region via diffusion and can therefore be measured by SERS without static entrapment or adsorption of the molecules to the antenna itself.
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Affiliation(s)
- Paul Kühler
- Photonics and Optoelectronics Group, Department of Physics and Center for NanoScience (CeNS), Ludwig Maximilian University München , Amalienstrasse 54, Munich 80799, Germany
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69
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Surovtsev NV, Dzuba SA. Flexibility of phospholipids with saturated and unsaturated chains studied by Raman scattering: The effect of cholesterol on dynamical and phase transitions. J Chem Phys 2014; 140:235103. [DOI: 10.1063/1.4883237] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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70
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Purohit P, Chandar P, Vilinska A, Ananthapadmanabhan KP, Somasundaran P. Effect of mixed surfactants on stratum corneum: a drying stress and Raman spectroscopy study. Int J Cosmet Sci 2014; 36:379-85. [DOI: 10.1111/ics.12139] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 05/09/2014] [Indexed: 01/05/2023]
Affiliation(s)
- P. Purohit
- NSF Industry/University Cooperative Research Center for Advanced Studies in Novel Surfactants; Columbia University; New York NY 10027 U.S.A
| | - P. Chandar
- Unilever, Research and Development; 40 Merritt Boulevard; Trumbull CT 06611 U.S.A
| | - A. Vilinska
- NSF Industry/University Cooperative Research Center for Advanced Studies in Novel Surfactants; Columbia University; New York NY 10027 U.S.A
| | | | - P. Somasundaran
- NSF Industry/University Cooperative Research Center for Advanced Studies in Novel Surfactants; Columbia University; New York NY 10027 U.S.A
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71
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Berényi S, Mihály J, Wacha A, Tőke O, Bóta A. A mechanistic view of lipid membrane disrupting effect of PAMAM dendrimers. Colloids Surf B Biointerfaces 2014; 118:164-71. [DOI: 10.1016/j.colsurfb.2014.03.048] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 03/20/2014] [Accepted: 03/24/2014] [Indexed: 11/26/2022]
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72
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Asiala S, Schultz ZD. Surface enhanced Raman correlation spectroscopy of particles in solution. Anal Chem 2014; 86:2625-32. [PMID: 24502388 PMCID: PMC3966183 DOI: 10.1021/ac403882h] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 02/06/2014] [Indexed: 01/26/2023]
Abstract
Surface enhanced Raman correlation spectroscopy (SERCS) is shown as a label-free, chemically specific method for monitoring individual polymer beads and lipid vesicles interacting with a 2-D planar surface enhanced Raman (SERS) substrate in solution. The enhancement afforded by the SERS substrate allows for spectral data to be acquired in series at rates between 31 and 83 Hz. Auto- and cross-correlation of spectral data facilitates the measurement of diffusion constants for particles ranging in radius from 50 to 500 nm while discriminating signal associated with the target analyte from extraneous fluctuations. The measured diffusion coefficients are on the order of 10(-10)-10(-11) cm(2)/s, a factor of 40 times slower than predicted from the Stokes-Einstein equation, suggesting that particles are experiencing hindered diffusion at the surface. The enhanced signals appear to originate from particles less than 5 nm of the SERS substrate, consistent with adsorption to the surface. This work provides a means to measure and monitor surface interactions and demonstrates the utility and limits of SERS detection in solution over planar SERS substrates.
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Affiliation(s)
- Steven
M. Asiala
- Department of Chemistry and
Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Zachary D. Schultz
- Department of Chemistry and
Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
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73
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Berényi S, Mihály J, Kristyán S, Naszályi Nagy L, Telegdi J, Bóta A. Thermotropic and structural effects of poly(malic acid) on fully hydrated multilamellar DPPC–water systems. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:661-9. [DOI: 10.1016/j.bbamem.2012.09.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Revised: 09/20/2012] [Accepted: 09/24/2012] [Indexed: 11/30/2022]
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Asiala SM, Schultz ZD. Label-free in situ detection of individual macromolecular assemblies by surface enhanced Raman scattering. Chem Commun (Camb) 2012; 49:4340-2. [PMID: 23103901 DOI: 10.1039/c2cc37268a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrate label-free detection of lipid vesicles and polystyrene beads freely diffusing in aqueous solution using surface enhanced Raman scattering (SERS). The signals observed enable real-time identification and monitoring of individual particles interacting with the SERS substrate. SERS is demonstrated as a label-free method capable of monitoring transient species in solution on the millisecond time scale.
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Affiliation(s)
- Steven M Asiala
- University of Notre Dame, Department of Chemistry and Biochemistry, 251 Nieuwland Science Hall, Notre Dame, IN 46556, USA
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Cecchet F, Lis D, Caudano Y, Mani AA, Peremans A, Champagne B, Guthmuller J. Density functional theory-based simulations of sum frequency generation spectra involving methyl stretching vibrations: effect of the molecular model on the deduced molecular orientation and comparison with an analytical approach. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:124110. [PMID: 22394554 DOI: 10.1088/0953-8984/24/12/124110] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The knowledge of the first hyperpolarizability tensor elements of molecular groups is crucial for a quantitative interpretation of the sum frequency generation (SFG) activity of thin organic films at interfaces. Here, the SFG response of the terminal methyl group of a dodecanethiol (DDT) monolayer has been interpreted on the basis of calculations performed at the density functional theory (DFT) level of approximation. In particular, DFT calculations have been carried out on three classes of models for the aliphatic chains. The first class of models consists of aliphatic chains, containing from 3 to 12 carbon atoms, in which only one methyl group can freely vibrate, while the rest of the chain is frozen by a strong overweight of its C and H atoms. This enables us to localize the probed vibrational modes on the methyl group. In the second class, only one methyl group is frozen, while the entire remaining chain is allowed to vibrate. This enables us to analyse the influence of the aliphatic chain on the methyl stretching vibrations. Finally, the dodecanethiol (DDT) molecule is considered, for which the effects of two dielectrics, i.e. n-hexane and n-dodecane, are investigated. Moreover, DDT calculations are also carried out by using different exchange-correlation (XC) functionals in order to assess the DFT approximations. Using the DFT IR vectors and Raman tensors, the SFG spectrum of DDT has been simulated and the orientation of the methyl group has then been deduced and compared with that obtained using an analytical approach based on a bond additivity model. This analysis shows that when using DFT molecular properties, the predicted orientation of the terminal methyl group tends to converge as a function of the alkyl chain length and that the effects of the chain as well as of the dielectric environment are small. Instead, a more significant difference is observed when comparing the DFT-based results with those obtained from the analytical approach, thus indicating the importance of a quantum chemical description of the hyperpolarizability tensor elements of the methyl group.
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Affiliation(s)
- F Cecchet
- Research Centre in Physics of Matter and Radiation (PMR), FUNDP-University of Namur, 61 rue de Bruxelles, B-5000 Namur, Belgium.
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Gözen I, Jesorka A. Instrumental Methods to Characterize Molecular Phospholipid Films on Solid Supports. Anal Chem 2012; 84:822-38. [DOI: 10.1021/ac203126f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Irep Gözen
- Department of Chemical and Biological
Engineering, Chalmers University of Technology, Kemivägen 10, 41296 Göteborg, Sweden
| | - Aldo Jesorka
- Department of Chemical and Biological
Engineering, Chalmers University of Technology, Kemivägen 10, 41296 Göteborg, Sweden
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