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Quintard C, Tubbs E, Jonsson G, Jiao J, Wang J, Werschler N, Laporte C, Pitaval A, Bah TS, Pomeranz G, Bissardon C, Kaal J, Leopoldi A, Long DA, Blandin P, Achard JL, Battail C, Hagelkruys A, Navarro F, Fouillet Y, Penninger JM, Gidrol X. A microfluidic platform integrating functional vascularized organoids-on-chip. Nat Commun 2024; 15:1452. [PMID: 38365780 PMCID: PMC10873332 DOI: 10.1038/s41467-024-45710-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 02/02/2024] [Indexed: 02/18/2024] Open
Abstract
The development of vascular networks in microfluidic chips is crucial for the long-term culture of three-dimensional cell aggregates such as spheroids, organoids, tumoroids, or tissue explants. Despite rapid advancement in microvascular network systems and organoid technologies, vascularizing organoids-on-chips remains a challenge in tissue engineering. Most existing microfluidic devices poorly reflect the complexity of in vivo flows and require complex technical set-ups. Considering these constraints, we develop a platform to establish and monitor the formation of endothelial networks around mesenchymal and pancreatic islet spheroids, as well as blood vessel organoids generated from pluripotent stem cells, cultured for up to 30 days on-chip. We show that these networks establish functional connections with the endothelium-rich spheroids and vascular organoids, as they successfully provide intravascular perfusion to these structures. We find that organoid growth, maturation, and function are enhanced when cultured on-chip using our vascularization method. This microphysiological system represents a viable organ-on-chip model to vascularize diverse biological 3D tissues and sets the stage to establish organoid perfusions using advanced microfluidics.
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Affiliation(s)
- Clément Quintard
- Univ. Grenoble Alpes, CEA, IRIG/BGE, BIOMICS, 38000, Grenoble, France
- Univ. Grenoble Alpes, CEA, LETI, DTBS, 38000, Grenoble, France
- Department of Medical Genetics, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia (BC), Canada
| | - Emily Tubbs
- Univ. Grenoble Alpes, CEA, IRIG/BGE, BIOMICS, 38000, Grenoble, France
| | - Gustav Jonsson
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, IMBA, Dr. Bohr-Gasse 3, 1030, Vienna, Austria
- Vienna BioCenter PhD Program, Doctoral School of the University of Vienna and Medical University of Vienna, 1030, Vienna, Austria
- Eric Kandel Institute, Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Jie Jiao
- Department of Medical Genetics, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia (BC), Canada
| | - Jun Wang
- Department of Medical Genetics, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia (BC), Canada
| | - Nicolas Werschler
- School of Biomedical Engineering, University of British Columbia, Vancouver, British Columbia (BC), Canada
| | - Camille Laporte
- Univ. Grenoble Alpes, CEA, IRIG/BGE, BIOMICS, 38000, Grenoble, France
- Univ. Grenoble Alpes, CEA, LETI, DTBS, 38000, Grenoble, France
| | - Amandine Pitaval
- Univ. Grenoble Alpes, CEA, IRIG/BGE, BIOMICS, 38000, Grenoble, France
| | - Thierno-Sidy Bah
- Univ. Grenoble Alpes, CEA, IRIG, BGE, Gen&Chem, 38000, Grenoble, France
| | - Gideon Pomeranz
- Developmental Biology and Cancer Programme, UCL Great Ormond Street Institute of Child Health, London, UK
| | | | - Joris Kaal
- Univ. Grenoble Alpes, CEA, LETI, DTBS, 38000, Grenoble, France
| | - Alexandra Leopoldi
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, IMBA, Dr. Bohr-Gasse 3, 1030, Vienna, Austria
- Eric Kandel Institute, Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - David A Long
- Developmental Biology and Cancer Programme, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Pierre Blandin
- Univ. Grenoble Alpes, CEA, LETI, DTBS, 38000, Grenoble, France
| | - Jean-Luc Achard
- Université Grenoble Alpes, CNRS, Grenoble INP, LEGI, 38000, Grenoble, France
| | | | - Astrid Hagelkruys
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, IMBA, Dr. Bohr-Gasse 3, 1030, Vienna, Austria
- Eric Kandel Institute, Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Fabrice Navarro
- Univ. Grenoble Alpes, CEA, LETI, DTBS, 38000, Grenoble, France
| | - Yves Fouillet
- Univ. Grenoble Alpes, CEA, LETI, DTBS, 38000, Grenoble, France
| | - Josef M Penninger
- Department of Medical Genetics, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia (BC), Canada.
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, IMBA, Dr. Bohr-Gasse 3, 1030, Vienna, Austria.
- Eric Kandel Institute, Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria.
- Helmholtz Centre for Infection Research, Braunschweig, Germany.
| | - Xavier Gidrol
- Univ. Grenoble Alpes, CEA, IRIG/BGE, BIOMICS, 38000, Grenoble, France.
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Bissardon C, Mermet X, Quintard C, Sanjuan F, Fouillet Y, Bottausci F, Carriere M, Rivera F, Blandin P. Selective plane illumination microscope dedicated to volumetric imaging in microfluidic chambers. Biomed Opt Express 2022; 13:5261-5274. [PMID: 36425641 PMCID: PMC9664896 DOI: 10.1364/boe.455377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/11/2022] [Accepted: 04/11/2022] [Indexed: 05/31/2023]
Abstract
In this article, we are presenting an original selective plane illumination fluorescence microscope dedicated to image "Organ-on-chip"-like biostructures in microfluidic chips. In order to be able to morphologically analyze volumetric samples in development at the cellular scale inside microfluidic chambers, the setup presents a compromise between relatively large field of view (∼ 200 µm) and moderate resolution (∼ 5 µm). The microscope is based on a simple design, built around the chip and its microfluidic environment to allow 3D imaging inside the chip. In particular, the sample remains horizontally avoiding to disturb the fluidics phenomena. The experimental setup, its optical characterization and the first volumetric images are reported.
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Affiliation(s)
| | - Xavier Mermet
- Univ. Grenoble Alpes, CEA, LETI, DTBS, F-38000 Grenoble, France
| | | | - Federico Sanjuan
- Univ. de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Total, LFCR, Pau, France
| | - Yves Fouillet
- Univ. Grenoble Alpes, CEA, LETI, DTBS, F-38000 Grenoble, France
| | | | - Marie Carriere
- Univ. Grenoble-Alpes, CEA, CNRS, IRIG, SyMMES, F-38000 Grenoble, France
| | - Florence Rivera
- Univ. Grenoble Alpes, CEA, LETI, DTBS, F-38000 Grenoble, France
| | - Pierre Blandin
- Univ. Grenoble Alpes, CEA, LETI, DTBS, F-38000 Grenoble, France
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3
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Bonnet S, Lubin M, Doron M, Blanquer G, Perriollat M, Prada R, Blandin P, Gerbelot R. Spatial dependency of the PPG morphology at right carotid common artery. Annu Int Conf IEEE Eng Med Biol Soc 2022; 2022:3146-3149. [PMID: 36085811 DOI: 10.1109/embc48229.2022.9871985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
PhotoPlethysmoGraphy (PPG) is ubiquitously employed in wearable devices for health monitoring. Photodiode signal inversion is observed in rare occasions, most of the time when the sensor is pressed against the skin. We report in this article such observations made at the right common carotid artery site. Indeed we have systematically observed a photodiode signal inversion when the PPG sensor is placed where the pulse is the best felt at the carotid. In addition to be inverted, the pulse is steeper during the systolic phase. Such inversion has implications in terms of pulse arrival time (PAT) measurements In our experiments, this causes a difference of 20 ms in the carotid PAT when measured at the absolute maximum slope. The mechanical and optical properties of tissues must be better accounted to explain the PPG signal morphology. Clinical Relevance- Understanding the role of mechanical tissue properties seems relevant in order to obtain more reproducible results in PPG signal analysis.
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Lavabre T, Polizopoulou ZS, Isèbe D, Cioni O, Rebuffel V, Blandin P, Bourgès-Abella N, Trumel C. Detection of circulating microfilariae in canine EDTA blood using lens-free technology: preliminary results. J Vet Diagn Invest 2021; 33:572-576. [PMID: 33733938 DOI: 10.1177/10406387211001092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Dirofilaria immitis causes life-threatening heart disease in dogs, thus screening of dog populations is important. Lens-free technology (LFT) is a low-cost imaging technique based on light diffraction that allows computerized recognition of small objects in holographic images. We evaluated an algorithm capable of recognizing microfilariae in canine whole blood using the LFT. We examined 3 groups of 10 EDTA blood specimens, from dogs with microfilaremia (group A), healthy dogs (B), and dogs with hematologic modifications other than microfilaremia (C). The LFT analyzer photographed repeated series of 5 images of all samples. The algorithm declared a sample positive if a microfilaria was detected on ≥1, ≥2, or ≥3 of the 5 images of a series. Microfilariae were detected visually in the images in 9 of 10 cases in group A; no microfilariae were seen in the images from groups B and C. Of the 30 cases, there were 14, 4, and only 3 false-positives with the 1 of 5, 2 of 5, and 3 of 5 image cutoffs, respectively. There were no false-negatives, regardless of cutoff. LFT seems useful for detecting microfilaria and could have application in clinical pathology.
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Affiliation(s)
- Typhaine Lavabre
- Département des Sciences Cliniques des animaux de compagnie et de sport, École nationale vétérinaire de Toulouse, Université de Toulouse, INSERM, ENVT, UPS, Toulouse, France.,CREFRE, École nationale vétérinaire de Toulouse, Université de Toulouse, INSERM, ENVT, UPS, Toulouse, France
| | - Zoe S Polizopoulou
- Diagnostic Laboratory, School of Veterinary Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | | | - Olivier Cioni
- Université de Grenoble Alpes, CEA, LETI, Grenoble, France
| | | | - Pierre Blandin
- Université de Grenoble Alpes, CEA, LETI, Grenoble, France
| | - Nathalie Bourgès-Abella
- CREFRE, École nationale vétérinaire de Toulouse, Université de Toulouse, INSERM, ENVT, UPS, Toulouse, France
| | - Catherine Trumel
- Département des Sciences Cliniques des animaux de compagnie et de sport, École nationale vétérinaire de Toulouse, Université de Toulouse, INSERM, ENVT, UPS, Toulouse, France.,CREFRE, École nationale vétérinaire de Toulouse, Université de Toulouse, INSERM, ENVT, UPS, Toulouse, France
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5
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Mandula O, Kleman JP, Lacroix F, Allier C, Fiole D, Hervé L, Blandin P, Kraemer DC, Morales S. Phase and fluorescence imaging with a surprisingly simple microscope based on chromatic aberration. Opt Express 2020; 28:2079-2090. [PMID: 32121906 DOI: 10.1364/oe.28.002079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
We propose a simple and compact microscope combining phase imaging with multi-color fluorescence using a standard bright-field objective. The phase image of the sample is reconstructed from a single, approximately 100 μm out-of-focus image taken under semi-coherent illumination, while fluorescence is recorded in-focus in epi-fluorescence geometry. The reproducible changes of the focus are achieved with specifically introduced chromatic aberration in the imaging system. This allows us to move the focal plane simply by changing the imaging wavelength. No mechanical movement of neither sample nor objective or any other part of the setup is therefore required to alternate between the imaging modality. Due to its small size and the absence of motorized components the microscope can easily be used inside a standard biological incubator and allows long-term imaging of cell culture in physiological conditions. A field-of-view of 1.2 mm2 allows simultaneous observation of thousands of cells with micro-meter spatial resolution in phase and multi-channel fluorescence mode. In this manuscript we characterize the system and show a time-lapse of cell culture in phase and multi-channel fluorescence recorded inside an incubator. We believe that the small dimensions, easy usage and low cost of the system make it a useful tool for biological research.
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Bissardon C, Mermet X, Morales S, Bottausci F, Carriere M, Rivera F, Blandin P. Light sheet fluorescence microscope for microfluidic chip. EPJ Web Conf 2020. [DOI: 10.1051/epjconf/202023804005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present a light sheet fluorescence microscope dedicated to image “Organ-on-chip”-like biostructures in microfluidic chip. Based on a simple design, the setup is built around the chip and its environment to allow 3D imaging inside the chip in a microfluidic laboratory. The experimental setup, its optical characterization and first volumetric images are reported.
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7
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Allier C, Hervé L, Mandula O, Blandin P, Usson Y, Savatier J, Monneret S, Morales S. Quantitative phase imaging of adherent mammalian cells: a comparative study. Biomed Opt Express 2019; 10:2768-2783. [PMID: 31259050 PMCID: PMC6583341 DOI: 10.1364/boe.10.002768] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 03/08/2019] [Accepted: 03/11/2019] [Indexed: 05/30/2023]
Abstract
The Quantitative phase imaging methods have several advantages when it comes to monitoring cultures of adherent mammalian cells. Because of low photo-toxicity and no need for staining, we can follow cells in a minimally invasive way over a long period of time. The ability to measure the optical path difference in a quantitative manner allows the measurement of the cell dry mass, an important metric for studying the growth kinetics of mammalian cells. Here we present and compare cell measurements obtained with three different techniques: digital holographic microscopy, lens-free microscopy and quadriwave lateral sheering interferometry. We report a linear relationship between optical volume density values measured with these different techniques and estimate the precisions of this measurement for the different individual instruments.
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Affiliation(s)
- C. Allier
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
| | - L. Hervé
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
| | - O. Mandula
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
| | - P. Blandin
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
| | - Y. Usson
- TIMC-IMAG, Uni. Grenoble Alpes, CNRS UMR 5525, France
| | - J. Savatier
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille,
France
| | - S. Monneret
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille,
France
| | - S. Morales
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
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8
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de Kernier I, Ali-Cherif A, Rongeat N, Cioni O, Morales S, Savatier J, Monneret S, Blandin P. Large field-of-view phase and fluorescence mesoscope with microscopic resolution. J Biomed Opt 2019; 24:1-9. [PMID: 30852855 PMCID: PMC6975188 DOI: 10.1117/1.jbo.24.3.036501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 02/06/2019] [Indexed: 06/09/2023]
Abstract
Phase and fluorescence are complementary contrasts that are commonly used in biology. However, the coupling of these two modalities is traditionally limited to high magnification and complex imaging systems. For statistical studies of biological populations, a large field-of-view is required. We describe a 30 mm2 field-of-view dual-modality mesoscope with a 4-μm resolution. The potential of the system to address biological questions is illustrated on white blood cell numeration in whole blood and multiwavelength imaging of the human osteosarcoma (U2-OS) cells.
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Affiliation(s)
- Isaure de Kernier
- Université Grenoble Alpes, CEA, LETI, Grenoble, France
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | | | | | - Olivier Cioni
- Université Grenoble Alpes, CEA, LETI, Grenoble, France
| | | | - Julien Savatier
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Serge Monneret
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
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9
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Herve L, Cioni O, Blandin P, Navarro F, Menneteau M, Bordy T, Morales S, Allier C. Multispectral total-variation reconstruction applied to lens-free microscopy. Biomed Opt Express 2018; 9:5828-5836. [PMID: 30460165 PMCID: PMC6238925 DOI: 10.1364/boe.9.005828] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 08/27/2018] [Accepted: 09/26/2018] [Indexed: 05/05/2023]
Abstract
Lens-free microscopy multispectral acquisitions are processed with an inverse problem approach: a multispectral total variation criterion is defined and minimized with the conjugate gradients method. Reconstruction results show that the method is efficient to recover the phase image of densely packed cells.
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Affiliation(s)
- L Herve
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
| | - O Cioni
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
| | - P Blandin
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
| | - F Navarro
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSMB, F-38000 Grenoble, France
| | - M Menneteau
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSMB, F-38000 Grenoble, France
| | - T Bordy
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
| | - S Morales
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
| | - C Allier
- Univ. Grenoble Alpes, CEA, LETI, DTBS-LSIV, F-38000 Grenoble, France
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10
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Kubiliūtė R, Maximova KA, Lajevardipour A, Yong J, Hartley JS, Mohsin ASM, Blandin P, Chon JWM, Sentis M, Stoddart PR, Kabashin A, Rotomskis R, Clayton AHA, Juodkazis S. Ultra-pure, water-dispersed Au nanoparticles produced by femtosecond laser ablation and fragmentation. Int J Nanomedicine 2013; 8:2601-11. [PMID: 23888114 PMCID: PMC3722033 DOI: 10.2147/ijn.s44163] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Aqueous solutions of ultra-pure gold nanoparticles have been prepared by methods of femtosecond laser ablation from a solid target and fragmentation from already formed colloids. Despite the absence of protecting ligands, the solutions could be (1) fairly stable and poly size-dispersed; or (2) very stable and monodispersed, for the two fabrication modalities, respectively. Fluorescence quenching behavior and its intricacies were revealed by fluorescence lifetime imaging microscopy in rhodamine 6G water solution. We show that surface-enhanced Raman scattering of rhodamine 6G on gold nanoparticles can be detected with high fidelity down to micromolar concentrations using the nanoparticles. Application potential of pure gold nanoparticles with polydispersed and nearly monodispersed size distributions are discussed.
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Affiliation(s)
- Reda Kubiliūtė
- Centre for Micro-Photonics and Industrial Research Institute Swinburne, Faculty of Engineering and Industrial Sciences Swinburne University of Technology, Hawthorn, VIC, Australia
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11
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Blandin P, Maximova KA, Gongalsky MB, Sanchez-Royo JF, Chirvony VS, Sentis M, Timoshenko VY, Kabashin AV. Femtosecond laser fragmentation from water-dispersed microcolloids: toward fast controllable growth of ultrapure Si-based nanomaterials for biological applications. J Mater Chem B 2013; 1:2489-2495. [DOI: 10.1039/c3tb20285b] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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12
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Devauges V, Marquer C, Liot G, Blandin P, Cossec JC, Lécart S, Humbert S, Saudou F, Druon F, Georges P, Potier MC, Lévêque-Fort S. P1‐257: Impact of cholesterol on APP dimers' formation, using FRET detection and fluorescence decay imaging. Alzheimers Dement 2010. [DOI: 10.1016/j.jalz.2010.05.809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Viviane Devauges
- Laboratoire de Photophysique MoléculaireOrsay France
- Laboratoire Charles Fabry de l'Institut d'OptiquePalaiseau France
| | | | | | - Pierre Blandin
- Laboratoire de Photophysique MoléculaireOrsay France
- Laboratoire Charles Fabry de l'Institut d'OptiquePalaiseau France
| | | | | | | | | | - Frédéric Druon
- Laboratoire Charles Fabry de l'Institut d'OptiquePalaiseau France
- Centre de Photonique BiomédicaleOrsay France
| | - Patrick Georges
- Laboratoire Charles Fabry de l'Institut d'OptiquePalaiseau France
- Centre de Photonique BiomédicaleOrsay France
| | | | - Sandrine Lévêque-Fort
- Laboratoire de Photophysique MoléculaireOrsay France
- Centre de Photonique BiomédicaleOrsay France
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13
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Blandin P, Lévêque-Fort S, Lécart S, Cossec JC, Potier MC, Lenkei Z, Druon F, Georges P. Time-gated total internal reflection fluorescence microscopy with a supercontinuum excitation source. Appl Opt 2009; 48:553-559. [PMID: 19151824 DOI: 10.1364/ao.48.000553] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We present the instrumental development of a versatile total internal reflection fluorescence lifetime imaging microscopy setup illuminated by a supercontinuum laser source. It enables performing wide-field fluorescence lifetime imaging with subwavelength axial resolution for a large range of fluorophores. The short overall acquisition time and the axial resolution are well suited for dynamic neurobiological applications.
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Affiliation(s)
- Pierre Blandin
- Laboratoire de Photophysique Moléculaire, CNRS, Université Paris-Sud, Bat 210, 91405 Orsay, France
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14
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Blandin P, Druon F, Hanna M, Lévêque-Fort S, Lesvigne C, Couderc V, Leproux P, Tonello A, Georges P. Picosecond polarized supercontinuum generation controlled by intermodal four-wave mixing for fluorescence lifetime imaging microscopy. Opt Express 2008; 16:18844-18849. [PMID: 19581973 DOI: 10.1364/oe.16.018844] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We present the generation of a picosecond polarized supercontinuum in highly birefringent multimodal microstructured fiber. The initial steps of the spectral broadening are dominated by intermodal four-wave mixing controlled by the specific fiber design. Using a low repetition rate ultra-stable solid state laser, a pulse train well-suited for versatile time-domain fluorescence lifetime imaging applications is obtained.
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Affiliation(s)
- Pierre Blandin
- Laboratoire Charles Fabry de l'Institut d'Optique, CNRS, University Paris-Sud, Palaiseau, France
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15
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Gerhard C, Druon F, Blandin P, Hanna M, Balembois F, Georges P, Falcoz F. Efficient versatile-repetition-rate picosecond source for material processing applications. Appl Opt 2008; 47:967-974. [PMID: 18311268 DOI: 10.1364/ao.47.000967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report on the development of an efficient and simple picosecond diode-pumped solid-state laser source with a versatile repetition rate (typically 1 Hz-1 MHz) for material processing applications. The laser source is based on a 4 MHz repetition rate mode-locked oscillator and a passive 3D multipass amplifier both based on Nd:YVO(4) crystals. Micromachining experiments were performed to study the influence of pulse energy on the machining quality for Al, Cu, paper, and glass.
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Affiliation(s)
- Christoph Gerhard
- Laboratoire Charles Fabry del'Institut d'Optique, CNRS, Université Paris-Sud, RD 128, 91127 Palaiseau, France
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Lesvigne C, Couderc V, Tonello A, Leproux P, Barthélémy A, Lacroix S, Druon F, Blandin P, Hanna M, Georges P. Visible supercontinuum generation controlled by intermodal four-wave mixing in microstructured fiber. Opt Lett 2007; 32:2173-5. [PMID: 17671574 DOI: 10.1364/ol.32.002173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We present an experimental and numerical study of supercontinuum generation extended in the visible part of the spectrum by using a selective optical coupling of the pump wave in the largely anomalous dispersion regime. The broadband frequency generation is induced by an initial four-wave mixing process that converts the pump wave at 1064 nm into 831 nm anti-Stokes and 1478 nm Stokes wavelengths. Phase matching is ensured on such a large frequency shift thanks to a microstructured multimodal fiber with a specific design. Continuum generation is therefore enhanced around the two generated sidebands.
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Affiliation(s)
- C Lesvigne
- XLIM Institut de Recherche-UMR CNRS Université de Limoges, No. 6172, Faculté des Sciences et Techniques, 123 Avenue A. Thomas, F-87060 Limoges Cedex, France
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Blandin P, Druon F, Balembois F, Georges P, Lévêque-Fort S, Fontaine-Aupart MP. Diode-pumped passively mode-locked Nd:YVO4 laser at 914 nm. Opt Lett 2006; 31:214-6. [PMID: 16441034 DOI: 10.1364/ol.31.000214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We demonstrate, for the first time, to our knowledge, a diode-pumped passively mode-locked Nd:YVO4 laser, operating on the 4F(3/2)-4I(9/2) transition of the neodymium ion at 914 nm. We obtained 8.8 ps pulses at approximately 914 nm at a repetition rate of 94 MHz, and an averaged output power of 87 mW by using a semiconductor saturable absorber mirror.
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Affiliation(s)
- P Blandin
- Laboratoire Charles Fabry de l'Institut d'Optique, Centre National de la Recherche Scientifique et Université Paris Sud, Centre Universitaire, Orsay, France.
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Keyser-Tracqui C, Blandin P, Ricaut F, Petkovski E, Crubézy E, Ludes B. Does the Tat polymorphism originate in northern Mongolia? ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s0531-5131(03)01701-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Garcia P, Mérola F, Receveur V, Blandin P, Minard P, Desmadril M. Steady state and time-resolved fluorescence study of residual structures in an unfolded form of yeast phosphoglycerate kinase. Biochemistry 1998; 37:7444-55. [PMID: 9585558 DOI: 10.1021/bi973161x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [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: 02/07/2023]
Abstract
A previous study performed using steady state fluorescence has revealed the existence of residual structures surrounding the two tryptophan residues in an unfolded form of yeast phosphoglycerate kinase [Garcia, P., et al. (1995) Biochemistry 34, 397-404]. In this paper, we present a more detailed characterization of these residual structures, through the study of two single tryptophan-containing mutants of yPGK, W333F and W308Y. Denaturation experiments have first been performed at low temperatures to assess the nature of the interactions stabilizing these residual structures. On the other hand, the compactness and dynamics of the protein matrix were probed using tryptophan fluorescence quenching by acrylamide at various denaturant concentrations. Taking into consideration the changes in sample viscosity induced by addition of guanidinium chloride made feasible the use of this technique during the denaturation process. These different approaches have shown that the residual structures around tryptophan 308 are mainly stabilized by hydrophobic interactions and are more compact and less fluctuant than the ones surrounding tryptophan 333. Native and denatured yPGK have also been studied by time-resolved fluorescence spectroscopy. In the native protein, tryptophan buried in the core, W333, is mainly associated with a lifetime close to 0.1 ns, whereas tryptophan that is partially accessible to the solvent, W308, has a lifetime close to 0. 5 ns. The time-resolved tryptophan fluorescence emission of wild-type yPGK can be accounted for quantitatively by the summed emissions of its two single tryptophan mutants. The significance of minor long lifetime components is discussed for the two tryptophan residues. This new assignment of fluorescent decay times has allowed for the detection of a folding intermediate in which the environment of tryptophan 333 is modified for denaturant concentrations lower than those for tryptophan 308.
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Affiliation(s)
- P Garcia
- Laboratoire de Modélisation et d'Ingéniérie de Protéines, Université Paris-Sud, Orsay, France
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Blandin P, Massobrio C, Ballone P. Blandin, Massobrio, and Ballone reply. Phys Rev Lett 1994; 73:2144. [PMID: 10056983 DOI: 10.1103/physrevlett.73.2144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Blandin P, Massobrio C, Ballone P. Nucleation and growth of metallic submonolayers on compact metal surfaces. Phys Rev B Condens Matter 1994; 49:16637-16648. [PMID: 10010823 DOI: 10.1103/physrevb.49.16637] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Blandin P, Mérola F, Brochon JC, Trémeau O, Ménez A. Dynamics of the active loop of snake toxins as probed by time-resolved polarized tryptophan fluorescence. Biochemistry 1994; 33:2610-9. [PMID: 8117723 DOI: 10.1021/bi00175a033] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [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: 01/28/2023]
Abstract
The local environment and dynamics of the single tryptophan residue in the respective active loops of cardiotoxin and alpha-neurotoxin from Naja nigricollis and of erabutoxin b from Laticauda semifasciata have been studied by steady-state and time-resolved polarized fluorescence and analyzed with distributions of decay times. Trp11 in loop I of cardiotoxin exhibits a very broad and complex distribution of fluorescence lifetimes at 20 degrees C. Despite its relatively external location in the toxin, the residue appears to be partly shielded from water and shows restricted but significant conformational fluctuations on the picosecond and nanosecond time scales. The thermal stability of cardiotoxin allowed a study of its static and dynamic fluorescence properties over a large range of temperatures. Interconversions in the intermediate nanosecond range lead to a thorough reorganization of the cardiotoxin fluorescence lifetime distribution with temperature. On the contrary, the fluorescence kinetics of Trp29 in loop II of the two neurotoxins is dominated by about 80% of a major decay time, which suggests that a nearly unique local conformation of the toxin is maintained over all time scales above the sub-nanosecond range. The fluorescence anisotropy decays show that the residue also has extremely limited rotational freedom down to the picosecond time scale. These findings are in good agreement with structural and dynamic information previously reported on the different toxins from NMR and X-ray crystallographic studies. The different dynamic properties around the tryptophan residue of the cardiotoxin and neurotoxin active loops can be analyzed within the frame of their different respective mechanisms of toxicity.
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Affiliation(s)
- P Blandin
- Laboratoire pour l'Utilisation du Rayonnement Electromagnétique (LURE), Centre Universitaire Paris-Sud, CNRS-CEA-MEN, Orsay, France
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Blandin P, Massidda S, Barbiellini B, Jarlborg T, Lerch P, Manuel AA, Hoffmann L, Gauthier M, Sadowski W, Walker E, Peter M, Yu J, Freeman AJ. Two-photon momentum density in La2-xSrxCuO4 and Nd2-xCexCuO4. Phys Rev B Condens Matter 1992; 46:390-397. [PMID: 10002223 DOI: 10.1103/physrevb.46.390] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Blandin P. Etudes sur les Pisauridae africaines I. Le problème de la définition des genres Perenethis L. Koch, 1878, Tetragonophthalma Karsch, 1878, Chiasmopes Pavesi, 1883 et Maypacius Simon, 1898 (Araneae-PisauridaePisaurinae). REV SUISSE ZOOL 1974. [DOI: 10.5962/bhl.part.76005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Blandin P. Etudes sur les Pisauridae africaines II. Définition du genre Euprosthenops Pocock, 1897 et description du genre Euprosthenopsis n. gen. (Araneae - Pisauridae - Pisaurinae). REV SUISSE ZOOL 1974. [DOI: 10.5962/bhl.part.76052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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