1
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Salbe C, de Cremoux P, Bonneton C, Manet S, Almeida A, Magdelénat H, Bourstyn E, Robine S. Illegitimate Villin Transcripts in Normal Bone Marrow Precludes Detection of Colon Cancer Micrometastases. Int J Biol Markers 2018. [DOI: 10.1177/172460080001500107] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Villin is a specific marker for normal and tumoral colon tissue. We have developed a highly sensitive assay using reverse transcription (RT) and real-time PCR to detect villin transcripts. The sensitivity of detection is one colon cancer cell. However, high levels of illegitimate villin transcripts were observed in normal bone marrow, precluding the use of villin RT-PCR for routine detection of colon cancer cells in bone marrow of patients with colon cancer.
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Affiliation(s)
- C. Salbe
- Center for the Study of Biological Markers of Malignancy, Venice Regional Hospital, Venice - Italy
| | | | | | - S. Manet
- UMR 144 CNRS, Institut Curie, Paris
| | - A. Almeida
- Department of Translational Research and Technology Transfer, Institut Curie, Paris
| | - H. Magdelénat
- Department of Tumor Biology, Institut Curie, Paris
- Department of Translational Research and Technology Transfer, Institut Curie, Paris
| | - E. Bourstyn
- Department of Surgery, Institut Curie, Paris - France
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2
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Abstract
We present a small-angle coherent x-ray scattering technique used for measuring flow velocities in slow moving materials. The technique is an extension of X-ray Photon Correlation Spectroscopy (XPCS): It involves mixing the scattering from moving tracer particles with a static reference that heterodynes the signal. This acts to elongate temporal effects caused by flow in homodyne measurements, allowing for a more robust measurement of flow properties. Using coherent x-ray heterodyning, velocities ranging from 0.1 to 10 μm/s were measured for a viscous fluid pushed through a rectangular channel. We describe experimental protocols and theory for making these Poiseuille flow profile measurements and also develop the relevant theory for using heterodyne XPCS to measure velocities in uniform and Couette flows.
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Affiliation(s)
| | - Michael C Rogers
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Sabine Manet
- Department of Physics, McGill University, Montréal, Quebec H3A 2T8, Canada
| | - Mark Sutton
- Department of Physics, McGill University, Montréal, Quebec H3A 2T8, Canada
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3
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Gharbi MA, Manet S, Lhermitte J, Brown S, Milette J, Toader V, Sutton M, Reven L. Reversible Nanoparticle Cubic Lattices in Blue Phase Liquid Crystals. ACS Nano 2016; 10:3410-5. [PMID: 26900753 DOI: 10.1021/acsnano.5b07379] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Blue phases (BPs), a distinct class of liquid crystals (LCs) with 3D periodic ordering of double twist cylinders involving orthogonal helical director twists, have been theoretically studied as potential templates for tunable colloidal crystals. Here, we report the spontaneous formation of thermally reversible, cubic crystal nanoparticle (NP) assemblies in BPs. Gold NPs, functionalized to be highly miscible in cyanobiphenyl-based LCs, were dispersed in BP mixtures and characterized by polarized optical microscopy and synchrotron small-angle X-ray scattering (SAXS). The NPs assemble by selectively migrating to periodic strong trapping sites in the BP disclination lines. The NP lattice, remarkably robust given the small particle size (4.5 nm diameter), is commensurate with that of the BP matrix. At the BP I to BP II phase transition, the NP lattice reversibly switches between two different cubic structures. The simultaneous presence of two different symmetries in a single material presents an interesting opportunity to develop novel dynamic optical materials.
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Affiliation(s)
- Mohamed Amine Gharbi
- Centre for Self-Assembled Chemical Structures (CSACS/CRMAA), Department of Chemistry, McGill University , Montreal, Québec H3A0B8, Canada
- Department of Physics, McGill University , Montreal, Québec H3A2T8, Canada
| | - Sabine Manet
- Centre for Self-Assembled Chemical Structures (CSACS/CRMAA), Department of Chemistry, McGill University , Montreal, Québec H3A0B8, Canada
- Department of Physics, McGill University , Montreal, Québec H3A2T8, Canada
| | - Julien Lhermitte
- Department of Physics, McGill University , Montreal, Québec H3A2T8, Canada
| | - Sarah Brown
- Centre for Self-Assembled Chemical Structures (CSACS/CRMAA), Department of Chemistry, McGill University , Montreal, Québec H3A0B8, Canada
- Department of Physics, McGill University , Montreal, Québec H3A2T8, Canada
| | - Jonathan Milette
- Centre for Self-Assembled Chemical Structures (CSACS/CRMAA), Department of Chemistry, McGill University , Montreal, Québec H3A0B8, Canada
| | - Violeta Toader
- Centre for Self-Assembled Chemical Structures (CSACS/CRMAA), Department of Chemistry, McGill University , Montreal, Québec H3A0B8, Canada
| | - Mark Sutton
- Department of Physics, McGill University , Montreal, Québec H3A2T8, Canada
| | - Linda Reven
- Centre for Self-Assembled Chemical Structures (CSACS/CRMAA), Department of Chemistry, McGill University , Montreal, Québec H3A0B8, Canada
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Manet S, Cuvier AS, Valotteau C, Fadda GC, Perez J, Karakas E, Abel S, Baccile N. Structure of Bolaamphiphile Sophorolipid Micelles Characterized with SAXS, SANS, and MD Simulations. J Phys Chem B 2015; 119:13113-33. [DOI: 10.1021/acs.jpcb.5b05374] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Sabine Manet
- Sorbonne Universités, UPMC Univ Paris 06,
CNRS, Collège de France, UMR 7574, Chimie de la Matière
Condensée de Paris, F-75005 Paris, France
| | - Anne-Sophie Cuvier
- Sorbonne Universités, UPMC Univ Paris 06,
CNRS, Collège de France, UMR 7574, Chimie de la Matière
Condensée de Paris, F-75005 Paris, France
| | - Claire Valotteau
- Sorbonne Universités, UPMC Univ Paris 06,
CNRS, Collège de France, UMR 7574, Chimie de la Matière
Condensée de Paris, F-75005 Paris, France
| | - Giulia C. Fadda
- Laboratoire
Léon
Brillouin, LLB, CEA Saclay, F-91191 CEDEX Gif-sur-Yvette, France
| | - Javier Perez
- SWING, Synchrotron
Soleil, BP 48, F-91192 Gif-sur-Yvette, France
| | - Esra Karakas
- Maison
de la Simulation, USR 3441, CEA − CNRS − INRIA, Univ. Paris-Sud − Univ. de Versailles, 91191 CEDEX Gif-sur-Yvette, France
- Institute
for Integrative Biology of the Cell (I2BC), Commissariat à
l’Energie Atomique et aux Energies Alternatives (CEA), Centre
National de la Recherche Scientifique (CNRS), Université Paris-Sud, CEA-Saclay, F-91191 Gif-sur-Yvette, France
| | - Stéphane Abel
- Institute
for Integrative Biology of the Cell (I2BC), Commissariat à
l’Energie Atomique et aux Energies Alternatives (CEA), Centre
National de la Recherche Scientifique (CNRS), Université Paris-Sud, CEA-Saclay, F-91191 Gif-sur-Yvette, France
| | - Niki Baccile
- Sorbonne Universités, UPMC Univ Paris 06,
CNRS, Collège de France, UMR 7574, Chimie de la Matière
Condensée de Paris, F-75005 Paris, France
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5
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Manet S, Karpichev Y, Dedovets D, Oda R. Effect of Hofmeister and alkylcarboxylate anionic counterions on the Krafft temperature and melting temperature of cationic gemini surfactants. Langmuir 2013; 29:3518-3526. [PMID: 23346886 DOI: 10.1021/la304341x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The effect of counterions was investigated to probe the principal ionic effects on the solubility in water and melting behavior of cationic gemini surfactants. We focused on two types of counterions: (1) small inorganic counterions that are typically taken from the Hofmeister series were studied to focus on the effect of ion type and (2) n-alkylcarboxylate counterions were studied to focus on the effect of the hydrophobicity of counterions. The Krafft temperature (Tk) and melting temperature (Tm) were obtained by conductivity measurements, calorimetric measurements, and optical microscopy observation. The results clearly indicate that Tk, which represents the solubility of surfactants, is not determined by a single parameter of ions such as the hydration free energy, as is too often assumed, but rather by the combined effects between the hydrophobicity of anions associated with other effects such as the polarizability, dehydrated ion size, and ionic morphology. In parallel, our observation demonstrated that all of the surfactants showed a transition from a crystalline phase to a thermotropic liquid-crystalline phase at around ca. 70 °C, which transformed to an isotropic liquid phase at around ca. 150 °C, and that the transition temperatures depended strongly on the counterion type. The counterion effects on the solubilization and melting behaviors were then compared with micellization properties that have been reported previously. These results provide new insight into understanding the effect of ions on the delicate balance of forces controlling the solution properties and aggregate morphology of charged amphiphilic molecules. Specifically, the solubilization properties of these cationic surfactants with various counterions were determined mainly by the subtle interplay between the hydration of counterions and the dissociation energies (stability of crystallinity) of the ion pair.
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Affiliation(s)
- Sabine Manet
- UMR 5248 CBMN, CNRS-Université de Bordeaux, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, F-33607 Pessac, France
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Michaux F, Baccile N, Impéror-Clerc M, Malfatti L, Folliet N, Gervais C, Manet S, Meneau F, Pedersen JS, Babonneau F. In situ time-resolved SAXS study of the formation of mesostructured organically modified silica through modeling of micelles evolution during surfactant-templated self-assembly. Langmuir 2012; 28:17477-17493. [PMID: 23214421 DOI: 10.1021/la3038318] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The mechanisms of formation of organically modified (phenyl, vinyl, and methyl) silica materials with cubic Pm3n and hexagonal p6m periodic mesostructures obtained in one step in the presence of the cetyltrimethylammonium bromide (CTA(+)B) surfactant are reported in this study. Understanding the way these complex materials form is difficult but undoubtedly necessary for controlling the material structure and its properties because of the combined presence of surface organic groups and large surface areas. Here, the mechanism of formation is clarified on the basis of the modeling of time-resolved in situ small angle X-ray scattering (SAXS) experiments, with a specific focus on the micelle evolution during material formation. Their fast self-assembly is followed for the first time with a quick temporal resolution of a few seconds using a third-generation synchrotron radiation source. To better understand the behavior of the complex organic-containing mesostructure, we perform a comparative study with the corresponding organo-free, isostructural materials obtained from three different surfactants (CTA(+), CTEA(+), and CTPA(+)) having a constant chain length (C(16)) and an increasing polar head volume (met-, et-, and prop-). Numerical modeling of SAXS data was crucial to highlighting a systematic sphere-to-rod micellar transition, otherwise undetected, before the formation of the 2D hexagonal phase in both organo-free and organo-containing systems. Then, two different pathways were found in the formation of the cubic Pm3n mesostructure: either an ordering transition from concentrated flocs of spherical micelles (from CTEA(+) or CTPA(+)) for pure TEOS systems or a structural transformation from an intermediate 2D hexagonal mesophase in organosilane systems (from CTA(+)). Combining the comparison between organo-free and organo-containing systems with numerical modeling, we find that the hexagonal-to-cubic phase transition in the organically modified materials seems to be strongly influenced not only by the obvious presence of the organic group but also by the quicker and more massive condensation kinetics of silicate oligomers on the CTA(+) micellar surface. Finally, quite unexpectedly, we find a wormlike-to-sphere micellar transition in the CTPA(+) system.
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Affiliation(s)
- Florentin Michaux
- UPMC Univ. Paris 06, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005, Paris, France
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7
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Manet S, Schmitt J, Impéror-Clerc M, Zholobenko V, Durand D, Oliveira CLP, Pedersen JS, Gervais C, Baccile N, Babonneau F, Grillo I, Meneau F, Rochas C. Kinetics of the Formation of 2D-Hexagonal Silica Nanostructured Materials by Nonionic Block Copolymer Templating in Solution. J Phys Chem B 2011; 115:11330-44. [DOI: 10.1021/jp200213k] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sabine Manet
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
| | - Julien Schmitt
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
| | - Marianne Impéror-Clerc
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
| | - Vladimir Zholobenko
- Chemistry Department, Keele University, Staffordshire, ST5 5BG, United Kingdom
| | - Dominique Durand
- Institut de Biochimie et de Biophysique Moléculaire et Cellulaire, Bât. 430, Université Paris-Sud, F-91405 Orsay, France
| | - Cristiano L. P. Oliveira
- Department of Chemistry and iNANO Interdisciplinary Nanoscience Center, Århus University, DK-8000 Århus, Denmark
| | - Jan Skov Pedersen
- Department of Chemistry and iNANO Interdisciplinary Nanoscience Center, Århus University, DK-8000 Århus, Denmark
| | - Christel Gervais
- Laboratoire de Chimie de la Matière Condensée, Collège de France, F-75231 Paris Cedex 05, France
| | - Niki Baccile
- Laboratoire de Chimie de la Matière Condensée, Collège de France, F-75231 Paris Cedex 05, France
| | - Florence Babonneau
- Laboratoire de Chimie de la Matière Condensée, Collège de France, F-75231 Paris Cedex 05, France
| | | | - Florian Meneau
- SWING, Synchrotron Soleil, BP 48, F-91192 Gif-sur-Yvette, France
| | - Cyrille Rochas
- D2AM, ESRF, 6 rue Jules Horowitz, F-38000 Grenoble, France
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8
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Manet S, Lecchi A, Impéror-Clerc M, Zholobenko V, Durand D, Oliveira CLP, Pedersen JS, Grillo I, Meneau F, Rochas C. Structure of Micelles of a Nonionic Block Copolymer Determined by SANS and SAXS. J Phys Chem B 2011; 115:11318-29. [DOI: 10.1021/jp200212g] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sabine Manet
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
| | - Amélie Lecchi
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
| | - Marianne Impéror-Clerc
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
| | - Vladimir Zholobenko
- Chemistry Department, Keele University, Staffordshire, ST5 5BG, United Kingdom
| | - Dominique Durand
- Institut de Biochimie et de Biophysique Moléculaire et Cellulaire, Bât. 430, Université Paris-Sud, F-91405 Orsay, France
| | - Cristiano L. P. Oliveira
- Department of Chemistry and iNANO Interdisciplinary Nanoscience Center, Århus University, DK-8000 Århus, Denmark
| | - Jan Skov Pedersen
- Department of Chemistry and iNANO Interdisciplinary Nanoscience Center, Århus University, DK-8000 Århus, Denmark
| | | | - Florian Meneau
- SWING, Synchrotron Soleil, BP 48, F-91192 Gif-sur-Yvette, France
| | - Cyrille Rochas
- D2AM, ESRF, 6 rue Jules Horowitz, F-38000 Grenoble, France
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9
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Muller F, Manet S, Jean B, Chambat G, Boué F, Heux L, Cousin F. SANS Measurements of Semiflexible Xyloglucan Polysaccharide Chains in Water Reveal Their Self-Avoiding Statistics. Biomacromolecules 2011; 12:3330-6. [DOI: 10.1021/bm200881x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- François Muller
- Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif sur Yvette Cedex, France
| | - Sabine Manet
- CERMAV, CNRS UPR 5301, BP 53 38041 Grenoble Cedex, France
| | - Bruno Jean
- CERMAV, CNRS UPR 5301, BP 53 38041 Grenoble Cedex, France
| | - Gérard Chambat
- CERMAV, CNRS UPR 5301, BP 53 38041 Grenoble Cedex, France
| | - François Boué
- Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif sur Yvette Cedex, France
| | - Laurent Heux
- CERMAV, CNRS UPR 5301, BP 53 38041 Grenoble Cedex, France
| | - Fabrice Cousin
- Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif sur Yvette Cedex, France
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Manet S, Karpichev Y, Bassani D, Kiagus-Ahmad R, Oda R. Counteranion effect on micellization of cationic gemini surfactants 14-2-14: Hofmeister and other counterions. Langmuir 2010; 26:10645-56. [PMID: 20394385 DOI: 10.1021/la1008768] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The effect of counterions was investigated and analyzed to probe the principal ionic effects influencing the micellization behavior of dimeric cationic surfactant ethanediylbis(dimethyltetradecylammonium), referred to as gemini 14-2-14. The 30 counterions were classified to four different families depending on their nature: (1) small and inorganic counterions which are typically taken from the Hofmeister series were studied to focus on the effect of ion type; (2) n-alkyl carboxylate counterions were studied to focus on the effect of the hydrophobicity of counterions; (3) aromatic carboxylate counterions were included to focus on the effect of the position of substitutions; and (4) other counterions were included in order to shed light on other parameters. By investigating the critical micelle concentration (CMC), ionization degree of micelle (alpha), free energy of micellization (DeltaG(M)), and aggregation numbers N of the gemini surfactant with these different types of anions, we demonstrated the effect of different ion properties independently. This approach allowed us to describe the effect of counterions on the micellization behavior of the gemini surfactant in terms of complex interplay between hydrophobicity of anions and other ion properties such as counterion hydration, interfacial packing of ions, and ionic morphology. Indeed, our results clearly demonstrate that a counterion effect on micellization properties cannot be described as a result of one single parameter of ions, as is too often assumed, but rather the balancing effects cooperatively affect the propensity of counterions to form ion pairs with surfactant headgroups and the entropy gain upon micellization. These results provide new insight in understanding the effect of ions on the delicate balance of forces controlling aggregate morphology and solution properties of charged amphiphilic molecules.
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Affiliation(s)
- Sabine Manet
- Institut Européen de Chimie et Biologie, UMR 5248 CBMN, CNRS-Université de Bordeaux-ENITAB, 2 rue Robert Escarpit, F-33607 Pessac, France
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11
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Aimé C, Plet B, Manet S, Schmitter JM, Huc I, Oda R, Sauers RR, Romsted LS. Competing Gas-Phase Substitution and Elimination Reactions of Gemini Surfactants with Anionic Counterions by Mass Spectrometry. Density Functional Theory Correlations with Their Bolaform Halide Salt Models. J Phys Chem B 2008; 112:14435-45. [DOI: 10.1021/jp802801r] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Carole Aimé
- Institut Européen de Chimie et Biologie, University of Bordeaux, UMR 5248 CNRS U-Bx1, ENITAB, 2 rue Robert Escarpit, 33607 Pessac, France
| | - Benoit Plet
- Institut Européen de Chimie et Biologie, University of Bordeaux, UMR 5248 CNRS U-Bx1, ENITAB, 2 rue Robert Escarpit, 33607 Pessac, France
| | - Sabine Manet
- Institut Européen de Chimie et Biologie, University of Bordeaux, UMR 5248 CNRS U-Bx1, ENITAB, 2 rue Robert Escarpit, 33607 Pessac, France
| | - Jean-Marie Schmitter
- Institut Européen de Chimie et Biologie, University of Bordeaux, UMR 5248 CNRS U-Bx1, ENITAB, 2 rue Robert Escarpit, 33607 Pessac, France
| | - Ivan Huc
- Institut Européen de Chimie et Biologie, University of Bordeaux, UMR 5248 CNRS U-Bx1, ENITAB, 2 rue Robert Escarpit, 33607 Pessac, France
| | - Reiko Oda
- Institut Européen de Chimie et Biologie, University of Bordeaux, UMR 5248 CNRS U-Bx1, ENITAB, 2 rue Robert Escarpit, 33607 Pessac, France
| | - Ronald R. Sauers
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
| | - Laurence S. Romsted
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
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Aimé C, Manet S, Satoh T, Ihara H, Park KY, Godde F, Oda R. Self-assembly of nucleoamphiphiles: investigating nucleosides effect and the mechanism of micrometric helix formation. Langmuir 2007; 23:12875-12885. [PMID: 17994775 DOI: 10.1021/la702105s] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A new family of self-assembling systems based on nucleoamphiphiles is described. Nano to micrometric left-handed helix formation in aqueous solution was induced simply by complexing a GMP or an AMP with a nonchiral monocationic amphiphile. The assembling behavior such as micellar formation, monolayer at air-water interface, as well as the aggregates in solution of these nucleoamphiphiles are strongly influenced by the presence of nucleosides in solution. The observed effects depend on the properties of complexed nucleotides and nucleosides with a complex mixture of pi stacking, hydrophobicity of the bases, and hydrogen bonding.
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Affiliation(s)
- Carole Aimé
- Institut Européen de Chimie et Biologie, UMR 5248 CBMN, CNRS-Université Bordeaux 1-ENITAB, IECB, 2 rue Robert Escarpit, 33607 Pessac, France
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13
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Loudet C, Manet S, Gineste S, Oda R, Achard MF, Dufourc EJ. Biphenyl bicelle disks align perpendicular to magnetic fields on large temperature scales: a study combining synthesis, solid-state NMR, TEM, and SAXS. Biophys J 2007; 92:3949-59. [PMID: 17307824 PMCID: PMC1868983 DOI: 10.1529/biophysj.106.097758] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A phosphatidylcholine lipid (PC) containing a biphenyl group in one of its acyl chains (1-tetradecanoyl-2-(4-(4-biphenyl)butanoyl)-sn-glycero-3-PC, TBBPC) was successfully synthesized with high yield. Water mixtures of TBBPC with a short-chain C(6) lipid, dicaproyl-PC (DCPC), lead to bicelle systems formation. Freeze-fracture electron microscopy evidenced the presence of flat bilayered disks of 800 A diameter for adequate composition, hydration, and temperature conditions. Because of the presence of the biphenyl group, which confers to the molecule a positive magnetic anisotropy Delta chi, the disks align with their normal, n, parallel to the magnetic field B(0), as directly detected by (31)P, (14)N, (2)H solid-state NMR and also using small-angle x-ray scattering after annealing in the field. Temperature-composition and temperature-hydration diagrams were established. Domains where disks of TBBPC/DCPC align with their normal parallel to the field were compared to chain-saturated lipid bicelles made of DMPC(dimyristoylPC)/DCPC, which orient with their normal perpendicular to B(0). TBBPC/DCPC bicelles exist on a narrow range of long- versus short-chain lipid ratios (3%) but over a large temperature span around room temperature (10-75 degrees C), whereas DMPC/DCPC bicelles exhibit the reverse situation, i.e., large compositional range (22%) and narrow temperature span (25-45 degrees C). The two types of bicelles present orienting properties up to 95% dilution but with the peculiarity that water trapped in biphenyl bicelles exhibits ordering properties twice as large as those observed in the saturated-chains analog, which offers very interesting properties for structural studies on hydrophilic or hydrophobic embedded biomolecules.
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Affiliation(s)
- Cécile Loudet
- UMR 5248 CBMN, CNRS-Université Bordeaux 1-ENITAB, Institut Européen de Chimie et Biologie, Pessac, France
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14
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Wang Y, Desbat B, Manet S, Aimé C, Labrot T, Oda R. Aggregation behaviors of gemini nucleotide at the air-water interface and in solutions induced by adenine-uracil interaction. J Colloid Interface Sci 2006; 283:555-64. [PMID: 15721933 DOI: 10.1016/j.jcis.2004.09.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2004] [Accepted: 09/02/2004] [Indexed: 11/22/2022]
Abstract
Cationic gemini surfactants having nucleotides as counterions (called nucleo-gemini hereafter) were synthesized and their aggregation behavior at air-water surfaces as well as in bulk solutions were studied. Fluid solutions of these nucleo-gemini surfactants show transitions to hydrogels upon addition of complementary nucleoside bases or other nucleo-gemini surfactants having complementary bases as counterions. The FTIR-ATR measurements show that the carboxylate groups of uridine form hydrogen bonds with the amine groups of adenosine. The aggregation behavior was also confirmed at the air-water interface by Brewster angle microscopy as well as surface pressure measurements; the monolayer of a gemini nucleotide was observed to undergo a transition to multilayers when nucleosides with complementary bases were added into the subphase. Isotherm curves of surface pressure monitored in parallel show a decrease in molecular area upon addition of such nucleosides.
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Affiliation(s)
- Yujie Wang
- Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, 33607 Pessac Cedex, France
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15
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Affiliation(s)
- Sabine Manet
- Département de chimie, Centre de recherche en sciences et ingénierie des macromolécules, Faculté des sciences et de génie, Université Laval, Québec, Québec, Canada G1K 7P4
| | - Carmen Tibirna
- Département de chimie, Centre de recherche en sciences et ingénierie des macromolécules, Faculté des sciences et de génie, Université Laval, Québec, Québec, Canada G1K 7P4
| | - Julie Boivin
- Département de chimie, Centre de recherche en sciences et ingénierie des macromolécules, Faculté des sciences et de génie, Université Laval, Québec, Québec, Canada G1K 7P4
| | - Christine Delabroye
- Département de chimie, Centre de recherche en sciences et ingénierie des macromolécules, Faculté des sciences et de génie, Université Laval, Québec, Québec, Canada G1K 7P4
| | - Josée Brisson
- Département de chimie, Centre de recherche en sciences et ingénierie des macromolécules, Faculté des sciences et de génie, Université Laval, Québec, Québec, Canada G1K 7P4
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16
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Nahon S, Dugue C, Adotti F, Manet S, Bouzard D, Tuszinski T, Lesgourgues B, Delas N. [Small bowel obstruction secondary to ischemic stenosis due to cholesterol crystal embolism]. Ann Med Interne (Paris) 2000; 151:417-20. [PMID: 11033479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Cholesterol crystal embolization is a well-known disorder resulting from release of cholesterol crystals from ulcerous atherosclerotic plaques. Gastrointestinal involvement occurs in about a third of cases, but it is usually asymptomatic. We report a case of an old woman with small bowel obstruction secondary to atheromatous embolism. She was treated by acenocoumarol for atrial fibrillation and pulmonary embolism. Two weeks before admission for small bowel obstruction, she had a watery diarrhea. After 3 weeks of parenteral nutrition, she underwent resection of the involved ileum. Pathological examination showed a small bowel stricture secondary to atheromatous embolism. Cholesterol emboli should be considered as a potential cause of small bowel obstruction in old patient who has taken anticoagulant therapy or after vascular invasive procedure.
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Affiliation(s)
- S Nahon
- Service d'Hépato-Gastroentérologie, Centre Hospitalier Intercommunal Le Raincy-Montfermeil, Montfermeil
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17
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Salbe C, de Cremoux P, Bonneton C, Manet S, Almeida A, Magdelénat H, Bourstyn E, Robine S. Illegitimate villin transcripts in normal bone marrow precludes detection of colon cancer micrometastases. Int J Biol Markers 2000; 15:41-3. [PMID: 10763139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Villin is a specific marker for normal and tumoral colon tissue. We have developed a highly sensitive assay using reverse transcription (RT) and real-time PCR to detect villin transcripts. The sensitivity of detection is one colon cancer cell. However, high levels of illegitimate villin transcripts were observed in normal bone marrow, precluding the use of villin RT-PCR for routine detection of colon cancer cells in bone marrow of patients with colon cancer.
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Affiliation(s)
- C Salbe
- Center for the Study of Biological Markers of Malignancy, Venice Regional Hospital, Italy
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