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Balsollier L, Lavancier F, Salamero J, Kervrann C. A generative model to simulate spatiotemporal dynamics of biomolecules in cells. BIOLOGICAL IMAGING 2023; 3:e22. [PMID: 38510174 PMCID: PMC10951932 DOI: 10.1017/s2633903x2300020x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 10/12/2023] [Accepted: 10/15/2023] [Indexed: 03/22/2024]
Abstract
Generators of space-time dynamics in bioimaging have become essential to build ground truth datasets for image processing algorithm evaluation such as biomolecule detectors and trackers, as well as to generate training datasets for deep learning algorithms. In this contribution, we leverage a stochastic model, called birth-death-move (BDM) point process, in order to generate joint dynamics of biomolecules in cells. This particle-based stochastic simulation method is very flexible and can be seen as a generalization of well-established standard particle-based generators. In comparison, our approach allows us: (1) to model a system of particles in motion, possibly in interaction, that can each possibly switch from a motion regime (e.g., Brownian) to another (e.g., a directed motion); (2) to take into account finely the appearance over time of new trajectories and their disappearance, these events possibly depending on the cell regions but also on the current spatial configuration of all existing particles. This flexibility enables to generate more realistic dynamics than standard particle-based simulation procedures, by for example accounting for the colocalization phenomena often observed between intracellular vesicles. We explain how to specify all characteristics of a BDM model, with many practical examples that are relevant for bioimaging applications. As an illustration, based on real fluorescence microscopy datasets, we finally calibrate our model to mimic the joint dynamics of Langerin and Rab11 proteins near the plasma membrane, including the well-known colocalization occurrence between these two types of vesicles. We show that the resulting synthetic sequences exhibit comparable features as those observed in real microscopy image sequences.
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Affiliation(s)
- Lisa Balsollier
- LMJL, UMR 6629, CNRS, Nantes Université, Nantes, France
- SERPICO Project-Team, Centre INRIA de l’Université de Rennes, Rennes Cedex, France
- Institut Curie, UMR 144, CNRS, PSL Research University, Sorbonne Universités, Paris, France
| | - Frédéric Lavancier
- LMJL, UMR 6629, CNRS, Nantes Université, Nantes, France
- CREST-ENSAI, UMR CNRS 9194, Campus de Ker-Lann, Rue Blaise Pascal, Bruz Cedex, France
| | - Jean Salamero
- SERPICO Project-Team, Centre INRIA de l’Université de Rennes, Rennes Cedex, France
- Institut Curie, UMR 144, CNRS, PSL Research University, Sorbonne Universités, Paris, France
| | - Charles Kervrann
- SERPICO Project-Team, Centre INRIA de l’Université de Rennes, Rennes Cedex, France
- Institut Curie, UMR 144, CNRS, PSL Research University, Sorbonne Universités, Paris, France
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2
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Nawara TJ, Mattheyses AL. Imaging nanoscale axial dynamics at the basal plasma membrane. Int J Biochem Cell Biol 2023; 156:106349. [PMID: 36566777 PMCID: PMC10634635 DOI: 10.1016/j.biocel.2022.106349] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/16/2022] [Accepted: 12/21/2022] [Indexed: 12/24/2022]
Abstract
Understanding of how energetically unfavorable plasma membrane shapes form, especially in the context of dynamic processes in living cells or tissues like clathrin-mediated endocytosis is in its infancy. Even though cutting-edge microscopy techniques that bridge this gap exist, they remain underused in biomedical sciences. Here, we demystify the perceived complexity of these advanced microscopy approaches and demonstrate their power in resolving nanometer axial dynamics in living cells. Total internal reflection fluorescence microscopy based approaches are the main focus of this review. We present clathrin-mediated endocytosis as a model system when describing the principles, data acquisition requirements, data interpretation strategies, and limitations of the described techniques. We hope this standardized description will bring the approaches for measuring nanoscale axial dynamics closer to the potential users and help in choosing the right approach to the right question.
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Affiliation(s)
- Tomasz J Nawara
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Alexa L Mattheyses
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, USA.
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3
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Caranfil A, Le Cunff Y, Kervrann C. BayesTICS: Local temporal image correlation spectroscopy and Bayesian simulation technique for sparse estimation of diffusion in fluorescence imaging. BIOLOGICAL IMAGING 2023; 3:e5. [PMID: 38487689 PMCID: PMC10936362 DOI: 10.1017/s2633903x23000041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 10/29/2022] [Accepted: 01/28/2023] [Indexed: 03/17/2024]
Abstract
The dynamics and fusion of vesicles during the last steps of exocytosis are not well established yet in cell biology. An open issue is the characterization of the diffusion process at the plasma membrane. Total internal reflection fluorescence microscopy (TIRFM) has been successfully used to analyze the coordination of proteins involved in this mechanism. It enables to capture dynamics of proteins with high frame rate and reasonable signal-to-noise values. Nevertheless, methodological approaches that can analyze and estimate diffusion in local small areas at the scale of a single diffusing spot within cells, are still lacking. To address this issue, we propose a novel correlation-based method for local diffusion estimation. As a starting point, we consider Fick's second law of diffusion that relates the diffusive flux to the gradient of the concentration. Then, we derive an explicit parametric model which is further fitted to time-correlation signals computed from regions of interest (ROI) containing individual spots. Our modeling and Bayesian estimation framework are well appropriate to represent isolated diffusion events and are robust to noise, ROI sizes, and localization of spots in ROIs. The performance of BayesTICS is shown on both synthetic and real TIRFM images depicting Transferrin Receptor proteins.
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Affiliation(s)
- Anca Caranfil
- SERPICO Project-Team, INRIA Rennes, UMR144 CNRS Institut Curie, PSL Research, Sorbonne Université, Campus universitaire de Beaulieu, Rennes, France
- CeDRE Team, GDR UMR6290-CNRS, Faculty of Medicine, University of Rennes 1, Rennes, France
| | - Yann Le Cunff
- CeDRE Team, GDR UMR6290-CNRS, Faculty of Medicine, University of Rennes 1, Rennes, France
- Dyliss Team, Univ Rennes, CNRS, Inria, IRISA, UMR 6074, Campus de Beaulieu, Rennes, France
| | - Charles Kervrann
- SERPICO Project-Team, INRIA Rennes, UMR144 CNRS Institut Curie, PSL Research, Sorbonne Université, Campus universitaire de Beaulieu, Rennes, France
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4
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Prigent S, Nguyen HN, Leconte L, Valades-Cruz CA, Hajj B, Salamero J, Kervrann C. SPITFIR(e): a supermaneuverable algorithm for fast denoising and deconvolution of 3D fluorescence microscopy images and videos. Sci Rep 2023; 13:1489. [PMID: 36707688 PMCID: PMC9883505 DOI: 10.1038/s41598-022-26178-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 12/12/2022] [Indexed: 01/28/2023] Open
Abstract
Modern fluorescent microscopy imaging is still limited by the optical aberrations and the photon budget available in the specimen. A direct consequence is the necessity to develop flexible and "off-road" algorithms in order to recover structural details and improve spatial resolution, which is critical when restraining the illumination to low levels in order to limit photo-damages. Here, we report SPITFIR(e) a flexible method designed to accurately and quickly restore 2D-3D fluorescence microscopy images and videos (4D images). We designed a generic sparse-promoting regularizer to subtract undesirable out-of-focus background and we developed a primal-dual algorithm for fast optimization. SPITFIR(e) is a "swiss-knife" method for practitioners as it adapts to any microscopy techniques, to various sources of signal degradation (noise, blur), to variable image contents, as well as to low signal-to-noise ratios. Our method outperforms existing state-of-the-art algorithms, and is more flexible than supervised deep-learning methods requiring ground truth datasets. The performance, the flexibility, and the ability to push the spatiotemporal resolution limit of sub-diffracted fluorescence microscopy techniques are demonstrated on experimental datasets acquired with various microscopy techniques from 3D spinning-disk confocal up to lattice light sheet microscopy.
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Affiliation(s)
- Sylvain Prigent
- SERPICO Project-Team, Inria Centre Rennes-Bretagne Atlantique, 35042 Rennes Cedex, France ,grid.462844.80000 0001 2308 1657SERPICO/STED Team, UMR144 CNRS Institut Curie, PSL Research University, Sorbonne Universités, 75005 Paris, France
| | - Hoai-Nam Nguyen
- SERPICO Project-Team, Inria Centre Rennes-Bretagne Atlantique, 35042 Rennes Cedex, France ,grid.462844.80000 0001 2308 1657SERPICO/STED Team, UMR144 CNRS Institut Curie, PSL Research University, Sorbonne Universités, 75005 Paris, France
| | - Ludovic Leconte
- SERPICO Project-Team, Inria Centre Rennes-Bretagne Atlantique, 35042 Rennes Cedex, France ,grid.462844.80000 0001 2308 1657SERPICO/STED Team, UMR144 CNRS Institut Curie, PSL Research University, Sorbonne Universités, 75005 Paris, France
| | - Cesar Augusto Valades-Cruz
- SERPICO Project-Team, Inria Centre Rennes-Bretagne Atlantique, 35042 Rennes Cedex, France ,grid.462844.80000 0001 2308 1657SERPICO/STED Team, UMR144 CNRS Institut Curie, PSL Research University, Sorbonne Universités, 75005 Paris, France
| | - Bassam Hajj
- grid.465542.40000 0004 1759 735XLaboratoire Physico-Chimie, Institut Curie, PSL Research University, Sorbonne Universités, CNRS UMR168, 75005 Paris, France
| | - Jean Salamero
- SERPICO Project-Team, Inria Centre Rennes-Bretagne Atlantique, 35042 Rennes Cedex, France ,grid.462844.80000 0001 2308 1657SERPICO/STED Team, UMR144 CNRS Institut Curie, PSL Research University, Sorbonne Universités, 75005 Paris, France
| | - Charles Kervrann
- SERPICO Project-Team, Inria Centre Rennes-Bretagne Atlantique, 35042 Rennes Cedex, France ,grid.462844.80000 0001 2308 1657SERPICO/STED Team, UMR144 CNRS Institut Curie, PSL Research University, Sorbonne Universités, 75005 Paris, France
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Riachy L, Ferrand T, Chasserot-Golaz S, Galas L, Alexandre S, Montero-Hadjadje M. Advanced Imaging Approaches to Reveal Molecular Mechanisms Governing Neuroendocrine Secretion. Neuroendocrinology 2023; 113:107-119. [PMID: 34915491 DOI: 10.1159/000521457] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 12/09/2021] [Indexed: 11/19/2022]
Abstract
Identification of the molecular mechanisms governing neuroendocrine secretion and resulting intercellular communication is one of the great challenges of cell biology to better understand organism physiology and neurosecretion disruption-related pathologies such as hypertension, neurodegenerative, or metabolic diseases. To visualize molecule distribution and dynamics at the nanoscale, many imaging approaches have been developed and are still emerging. In this review, we provide an overview of the pioneering studies using transmission electron microscopy, atomic force microscopy, total internal reflection microscopy, and super-resolution microscopy in neuroendocrine cells to visualize molecular mechanisms driving neurosecretion processes, including exocytosis and associated fusion pores, endocytosis and associated recycling vesicles, and protein-protein or protein-lipid interactions. Furthermore, the potential and the challenges of these different advanced imaging approaches for application in the study of neuroendocrine cell biology are discussed, aiming to guide researchers to select the best approach for their specific purpose around the crucial but not yet fully understood neurosecretion process.
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Affiliation(s)
- Lina Riachy
- Laboratoire de Différenciation et Communication Neuronale et Neuroendocrine, Institut de Recherche et d'Innovation Biomédicale de Normandie, Normandie University, UNIROUEN, INSERM, U1239, Rouen, France
| | - Thomas Ferrand
- Laboratoire de Différenciation et Communication Neuronale et Neuroendocrine, Institut de Recherche et d'Innovation Biomédicale de Normandie, Normandie University, UNIROUEN, INSERM, U1239, Rouen, France
| | - Sylvette Chasserot-Golaz
- Institut des Neurosciences Cellulaires et Intégratives, Centre National de la Recherche Scientifique, Strasbourg University, Strasbourg, France
| | - Ludovic Galas
- Normandie University, UNIROUEN, INSERM, PRIMACEN, Rouen, France
| | - Stéphane Alexandre
- Polymères, Biopolymères, Surfaces Laboratory, CNRS, Normandie University, UNIROUEN, UMR 6270, Rouen, France
| | - Maité Montero-Hadjadje
- Laboratoire de Différenciation et Communication Neuronale et Neuroendocrine, Institut de Recherche et d'Innovation Biomédicale de Normandie, Normandie University, UNIROUEN, INSERM, U1239, Rouen, France
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6
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Lavancier F, Le Guével R. Spatial birth–death–move processes: Basic properties and estimation of their intensity functions. J R Stat Soc Series B Stat Methodol 2021. [DOI: 10.1111/rssb.12452] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Frédéric Lavancier
- Laboratoire de Mathématiques Jean Leray Université de Nantes Nantes France
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7
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Mau A, Friedl K, Leterrier C, Bourg N, Lévêque-Fort S. Fast widefield scan provides tunable and uniform illumination optimizing super-resolution microscopy on large fields. Nat Commun 2021; 12:3077. [PMID: 34031402 PMCID: PMC8144377 DOI: 10.1038/s41467-021-23405-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 04/26/2021] [Indexed: 11/24/2022] Open
Abstract
Non-uniform illumination limits quantitative analyses of fluorescence imaging techniques. In particular, single molecule localization microscopy (SMLM) relies on high irradiances, but conventional Gaussian-shaped laser illumination restricts the usable field of view to around 40 µm × 40 µm. We present Adaptable Scanning for Tunable Excitation Regions (ASTER), a versatile illumination technique that generates uniform and adaptable illumination. ASTER is also highly compatible with optical sectioning techniques such as total internal reflection fluorescence (TIRF). For SMLM, ASTER delivers homogeneous blinking kinetics at reasonable laser power over fields-of-view up to 200 µm × 200 µm. We demonstrate that ASTER improves clustering analysis and nanoscopic size measurements by imaging nanorulers, microtubules and clathrin-coated pits in COS-7 cells, and β2-spectrin in neurons. ASTER's sharp and quantitative illumination paves the way for high-throughput quantification of biological structures and processes in classical and super-resolution fluorescence microscopies.
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Affiliation(s)
- Adrien Mau
- Institut des Sciences Moléculaires d'Orsay, Université Paris-Saclay, CNRS, Orsay, France
- Abbelight, Cachan, France
| | - Karoline Friedl
- Abbelight, Cachan, France
- Aix-Marseille Université, CNRS, INP UMR7051, NeuroCyto, Marseille, France
| | | | | | - Sandrine Lévêque-Fort
- Institut des Sciences Moléculaires d'Orsay, Université Paris-Saclay, CNRS, Orsay, France.
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8
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Yuan T, Wei W, Jiang W, Wang W. Vertical Diffusion of Ions within Single Particles during Electrochemical Charging. ACS NANO 2021; 15:3522-3528. [PMID: 33560133 DOI: 10.1021/acsnano.1c00431] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Determining the trajectory of ionic transport and diffusion within single electroactive nanomaterials is critical for understanding the charging kinetics and capacity fading associated with ion batteries, with implications for rational design of excellent-performance electrode materials. While the horizontal pathway of mass transport has been feasibly investigated by optical superlocalization methods and electron microscopes, determination on the vertical trajectory has proven a more challenging task. Herein, we developed dual-angle total internal reflection microscopy by simultaneously introducing different angle-dependent illumination depths to trace the optical centroid shifts of nano-objects in the vertical dimension. We first demonstrated the proof of concept by resolving the vertical moving trails of a nanosphere doing Brownian motion and subsequently explored the picture of mass transport in the interior of single Prussian blue (PB) particles during electrochemical cycling. The results indicated that the vertical centroids of single PB particles remained unchanged when ions were inserted or extracted, suggesting an outside-in ionic transport pathway instead of bottom-up trajectory that one would intuitively expect.
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Affiliation(s)
- Tinglian Yuan
- State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Wei Wei
- State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Wenxuan Jiang
- State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Wei Wang
- State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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9
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Codron P, Letournel F, Marty S, Renaud L, Bodin A, Duchesne M, Verny C, Lenaers G, Duyckaerts C, Julien J, Cassereau J, Chevrollier A. STochastic Optical Reconstruction Microscopy (STORM) reveals the nanoscale organization of pathological aggregates in human brain. Neuropathol Appl Neurobiol 2021; 47:127-142. [PMID: 32688444 PMCID: PMC7891317 DOI: 10.1111/nan.12646] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 07/12/2020] [Accepted: 07/12/2020] [Indexed: 12/31/2022]
Abstract
AIMS Histological analysis of brain tissue samples provides valuable information about the pathological processes leading to common neurodegenerative disorders. In this context, the development of novel high-resolution imaging approaches is a current challenge in neuroscience. METHODS To this end, we used a recent super-resolution imaging technique called STochastic Optical Reconstruction Microscopy (STORM) to analyse human brain sections. We combined STORM cell imaging protocols with neuropathological techniques to image cryopreserved brain samples from control subjects and patients with neurodegenerative diseases. RESULTS This approach allowed us to perform 2D-, 3D- and two-colour-STORM in neocortex, white matter and brainstem samples. STORM proved to be particularly effective at visualizing the organization of dense protein inclusions and we imaged with a <50 nm resolution pathological aggregates within the central nervous system of patients with Alzheimer's disease, Parkinson's disease, Lewy body dementia and fronto-temporal lobar degeneration. Aggregated Aβ branches appeared reticulated and cross-linked in the extracellular matrix, with widths from 60 to 240 nm. Intraneuronal Tau and TDP-43 inclusions were denser, with a honeycomb pattern in the soma and a filamentous organization in the axons. Finally, STORM imaging of α-synuclein pathology revealed the internal organization of Lewy bodies that could not be observed by conventional fluorescence microscopy. CONCLUSIONS STORM imaging of human brain samples opens further gates to a more comprehensive understanding of common neurological disorders. The convenience of this technique should open a straightforward extension of its application for super-resolution imaging of the human brain, with promising avenues to current challenges in neuroscience.
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Affiliation(s)
- P. Codron
- Service de NeurologieCentre Hospitalier Universitaire d’AngersAngersFrance
- Laboratoire de Neurobiologie et NeuropathologieCentre Hospitalier Universitaire d’AngersAngersFrance
- Équipe MitolabInstitut MITOVASCINSERM U1083CNRS 6015Université d'AngersAngersFrance
| | - F. Letournel
- Service de NeurologieCentre Hospitalier Universitaire d’AngersAngersFrance
- Laboratoire de Neurobiologie et NeuropathologieCentre Hospitalier Universitaire d’AngersAngersFrance
| | - S. Marty
- Institut du Cerveau et de la Moelle épinièreINSERM U1127CNRS UMR7225Sorbonne UniversitéParisFrance
| | - L. Renaud
- CERVO Brain Research Centre2601 Chemin de la CanardièreQuébecQCCanada
| | - A. Bodin
- Équipe MitolabInstitut MITOVASCINSERM U1083CNRS 6015Université d'AngersAngersFrance
| | - M. Duchesne
- Laboratoire d'Anatomie PathologiqueCentre Hospitalier Universitaire DupuytrenLimogesFrance
- Centre de Référence des Neuropathies Périphériques RaresCentre Hospitalier Universitaire DupuytrenLimogesFrance
| | - C. Verny
- Service de NeurologieCentre Hospitalier Universitaire d’AngersAngersFrance
- Équipe MitolabInstitut MITOVASCINSERM U1083CNRS 6015Université d'AngersAngersFrance
| | - G. Lenaers
- Équipe MitolabInstitut MITOVASCINSERM U1083CNRS 6015Université d'AngersAngersFrance
| | - C. Duyckaerts
- Institut du Cerveau et de la Moelle épinièreINSERM U1127CNRS UMR7225Sorbonne UniversitéParisFrance
| | - J.‐P. Julien
- CERVO Brain Research Centre2601 Chemin de la CanardièreQuébecQCCanada
- Department of Psychiatry and NeuroscienceLaval UniversityQuébecQCCanada
| | - J. Cassereau
- Service de NeurologieCentre Hospitalier Universitaire d’AngersAngersFrance
- Équipe MitolabInstitut MITOVASCINSERM U1083CNRS 6015Université d'AngersAngersFrance
| | - A. Chevrollier
- Équipe MitolabInstitut MITOVASCINSERM U1083CNRS 6015Université d'AngersAngersFrance
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10
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Three-dimensional total-internal reflection fluorescence nanoscopy with nanometric axial resolution by photometric localization of single molecules. Nat Commun 2021; 12:517. [PMID: 33483489 PMCID: PMC7822951 DOI: 10.1038/s41467-020-20863-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 12/17/2020] [Indexed: 01/06/2023] Open
Abstract
Single-molecule localization microscopy enables far-field imaging with lateral resolution in the range of 10 to 20 nanometres, exploiting the fact that the centre position of a single-molecule’s image can be determined with much higher accuracy than the size of that image itself. However, attaining the same level of resolution in the axial (third) dimension remains challenging. Here, we present Supercritical Illumination Microscopy Photometric z-Localization with Enhanced Resolution (SIMPLER), a photometric method to decode the axial position of single molecules in a total internal reflection fluorescence microscope. SIMPLER requires no hardware modification whatsoever to a conventional total internal reflection fluorescence microscope and complements any 2D single-molecule localization microscopy method to deliver 3D images with nearly isotropic nanometric resolution. Performance examples include SIMPLER-direct stochastic optical reconstruction microscopy images of the nuclear pore complex with sub-20 nm axial localization precision and visualization of microtubule cross-sections through SIMPLER-DNA points accumulation for imaging in nanoscale topography with sub-10 nm axial localization precision. Achieving high axial resolution is challenging in single-molecule localization microscopy. Here, the authors present a photometric method to decode the axial position of single molecules in a total internal reflection fluorescence microscope without hardware modification, and show nearly isotropic nanometric resolution.
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11
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Croop B, Tang J, Han KY. Single-shot, shadowless total internal reflection fluorescence microscopy via annular fiber bundle. OPTICS LETTERS 2020; 45:6470-6473. [PMID: 33258839 PMCID: PMC8323474 DOI: 10.1364/ol.411296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 10/26/2020] [Indexed: 06/12/2023]
Abstract
We demonstrate a method of generating instantaneous and uniform total internal reflection fluorescence (TIRF) excitation by using an annular fiber bundle and spatially incoherent light sources. We show the flexibility of our method in that it can generate TIRF excitation with either a laser light source or an LED of different wavelengths, and facilitate switching between TIRF and epi illumination. In this report we detail the design of the fiber bundle, then demonstrate the performance via single-molecule imaging in the presence of high background and high throughput, and uniform TIRF imaging of cells over a large field of view. Our versatile method will enable quantitative shadowless TIRF imaging.
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Affiliation(s)
- Benjamin Croop
- CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL 32816 USA
| | - Jialei Tang
- CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL 32816 USA
| | - Kyu Young Han
- CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL 32816 USA
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12
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Liu W, Yuan Y, Zhang C, Han Y, Zhang Z, Xu L, Hao X, Kuang C, Liu X. Quantitative objective-based ring TIRFM system calibration through back focal plane imaging. OPTICS LETTERS 2020; 45:3001-3004. [PMID: 32479443 DOI: 10.1364/ol.394116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 04/25/2020] [Indexed: 06/11/2023]
Abstract
Being the established imaging tool for cell membrane-associated studies, total internal reflection fluorescence microscopy (TIRFM) still has some limitations. The most important one is the inhomogeneous evanescent excitation field mainly caused by the large-angle and fixed-azimuth illumination scheme, which can be eliminated by using ring-shaped illumination (ring TIRFM). However, it is challenging in assembling a ring TIRFM system with precise parameter control that works well. Here we emphasize the quantification of the ring TIRFM system and introduce a robust calibration routine to simultaneously rectify the asymmetry of the spinning light beam and determine the crucial experimental parameter, i.e., the incident angle. The calibration routine requires no specific sample preparation and is entirely based on the automatic back focal plane manipulation, avoiding possible errors caused by the sample difference and manual measurement. Its effectiveness is experimentally demonstrated by both the qualitative and quantitative comparisons of the images acquired using different samples, illumination schemes, and calibration approaches. These characteristics should enable our approach to greatly improve the practicability of TIRFM in life sciences.
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13
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Blanchard AT, Brockman JM, Salaita K, Mattheyses AL. Variable incidence angle linear dichroism (VALiD): a technique for unique 3D orientation measurement of fluorescent ensembles. OPTICS EXPRESS 2020; 28:10039-10061. [PMID: 32225599 PMCID: PMC7340377 DOI: 10.1364/oe.381676] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/10/2020] [Accepted: 01/13/2020] [Indexed: 06/02/2023]
Abstract
A fundamental challenge with fluorophore orientation measurement is degeneracy, which is the inability to distinguish between multiple unique fluorophore orientations. Techniques exist for the non-degenerate measurement of the orientations of single, static fluorophores. However, such techniques are unsuitable for densely labeled and/or dynamic samples common to biological research. Accordingly, a rapid, widefield microscopy technique that can measure orientation parameters for ensembles of fluorophores in a non-degenerate manner is desirable. We propose that exciting samples with polarized light and multiple incidence angles could enable such a technique. We use Monte Carlo simulations to validate this approach for specific axially symmetric ensembles of fluorophores and obtain optimal experimental parameters for its future implementation.
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Affiliation(s)
- Aaron T. Blanchard
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30322, USA
| | - Joshua M. Brockman
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30322, USA
| | - Khalid Salaita
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30322, USA
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
| | - Alexa L. Mattheyses
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
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14
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Liu W, Kuang C, Yuan Y, Zhang Z, Chen Y, Han Y, Xu L, Zhang M, Zhang YH, Xu Y, Liu X. Simultaneous Two-Angle Axial Ratiometry for Fast Live and Long-Term Three-Dimensional Super-Resolution Fluorescence Imaging. J Phys Chem Lett 2019; 10:7811-7816. [PMID: 31804831 DOI: 10.1021/acs.jpclett.9b03093] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The application of optical microscopy in four-dimensional (spatial and temporal) super-resolution imaging poses challenges because of the requirement of a long acquisition time or high illumination intensity. In this paper, we introduce simultaneous two-angle axial ratiometry (STARII) for <20 nm axial super-resolution imaging and for fast and long-term imaging of live cells up to hundreds of frames per second. This method involves recording two raw images in two incident angle channels in the context of evanescent wave illumination and obtaining the corresponding intensity ratio. Furthermore, we demonstrate the combination of STARII with the lateral super-resolution method to resolve three-dimensional nanoscale structures of microtubules and to visualize the long-term dynamical plasma membrane curvature and fast remodeling of endoplasmic reticulum tubule meshwork and three-way junctions. These demonstrations indicate an important potential application of STARII in investigating nanoscale cellular complex processes in the native state.
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Affiliation(s)
- Wenjie Liu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering , Zhejiang University , Hangzhou , Zhejiang 310027 , China
| | - Cuifang Kuang
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering , Zhejiang University , Hangzhou , Zhejiang 310027 , China
- Ningbo Research Institute , Zhejiang University , Ningbo , Zhejiang 315100 , China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , China
| | - Yifan Yuan
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering , Zhejiang University , Hangzhou , Zhejiang 310027 , China
| | - Zhimin Zhang
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering , Zhejiang University , Hangzhou , Zhejiang 310027 , China
| | - Youhua Chen
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering , Zhejiang University , Hangzhou , Zhejiang 310027 , China
- Shanxi Provincial Key Laboratory for Biomedical Imaging and Big Data , North University of China , Taiyuan , Shanxi 030051 , China
| | - Yubing Han
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering , Zhejiang University , Hangzhou , Zhejiang 310027 , China
| | - Liang Xu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering , Zhejiang University , Hangzhou , Zhejiang 310027 , China
| | - Meng Zhang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China
| | - Yu-Hui Zhang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China
| | - Yingke Xu
- Key Laboratory for Biomedical Engineering of Ministry of Education, Department of Biomedical Engineering , Zhejiang University , Hangzhou 310027 , China
| | - Xu Liu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering , Zhejiang University , Hangzhou , Zhejiang 310027 , China
- Ningbo Research Institute , Zhejiang University , Ningbo , Zhejiang 315100 , China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , China
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15
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Sheykhi E, Sajad B, Tavaddod S, Naderi-Manesh H, Roostaiei N. Tuning fluorophore excitation in a total-internal-reflection-fluorescence microscopy. APPLIED OPTICS 2019; 58:8055-8060. [PMID: 31674360 DOI: 10.1364/ao.58.008055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 09/10/2019] [Indexed: 06/10/2023]
Abstract
In a total-internal-reflection-fluorescence-microscopy method, there is anisotropy in the polarized evanescent wave. Since the evanescent wave is used as an excitation field, the mentioned anisotropy is a disadvantage in using the total-internal-reflection-fluorescence-microscopy technique. Therefore, by theoretical and analytical approaches, and based on the Fresnel coefficients, the effect of three dielectrics media on the anisotropy of the evanescent wave is investigated. Following that, a proper combination of the cover glass, oil immersion, and prism for both living and non-living samples is suggested that not only enhances the intensity of the evanescent wave, but also and importantly, decreases the essential anisotropy of the evanescent wave.
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16
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Chen M, Pan XH, Liu Q, Huo SX, Cao SH, Zhai YY, Zhao Y, Li YQ. Variable-Angle Nanoplasmonic Fluorescence Microscopy: An Axially Resolved Method for Tracking the Endocytic Pathway. Anal Chem 2019; 91:13658-13664. [DOI: 10.1021/acs.analchem.9b02845] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Min Chen
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
| | - Xiao-Hui Pan
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
| | - Qian Liu
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
| | - Si-Xin Huo
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
| | - Shuo-Hui Cao
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
| | - Yan-Yun Zhai
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
| | - Yan Zhao
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
| | - Yao-Qun Li
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
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17
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Lavancier F, Pécot T, Zengzhen L, Kervrann C. Testing independence between two random sets for the analysis of colocalization in bioimaging. Biometrics 2019; 76:36-46. [PMID: 31271216 DOI: 10.1111/biom.13115] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 06/24/2019] [Indexed: 11/30/2022]
Abstract
Colocalization aims at characterizing spatial associations between two fluorescently tagged biomolecules by quantifying the co-occurrence and correlation between the two channels acquired in fluorescence microscopy. Colocalization is presented either as the degree of overlap between the two channels or the overlays of the red and green images, with areas of yellow indicating colocalization of the molecules. This problem remains an open issue in diffraction-limited microscopy and raises new challenges with the emergence of superresolution imaging, a microscopic technique awarded by the 2014 Nobel prize in chemistry. We propose GcoPS, for Geo-coPositioning System, an original method that exploits the random sets structure of the tagged molecules to provide an explicit testing procedure. Our simulation study shows that GcoPS unequivocally outperforms the best competitive methods in adverse situations (noise, irregularly shaped fluorescent patterns, and different optical resolutions). GcoPS is also much faster, a decisive advantage to face the huge amount of data in superresolution imaging. We demonstrate the performances of GcoPS on two biological real data sets, obtained by conventional diffraction-limited microscopy technique and by superresolution technique, respectively.
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Affiliation(s)
- Frédéric Lavancier
- Laboratoire de Mathématiques Jean Leray, University of Nantes, Nantes, France
| | - Thierry Pécot
- Centre Rennes-Bretagne Atlantique, SERPICO Project Team, Inria, Rennes, France
| | - Liu Zengzhen
- CNRS UMR 144, Space Time Imaging of Endomembranes Dynamics Team, PSL Research University, Paris, France
| | - Charles Kervrann
- Centre Rennes-Bretagne Atlantique, SERPICO Project Team, Inria, Rennes, France
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18
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Oheim M, Salomon A, Weissman A, Brunstein M, Becherer U. Calibrating Evanescent-Wave Penetration Depths for Biological TIRF Microscopy. Biophys J 2019; 117:795-809. [PMID: 31439287 DOI: 10.1016/j.bpj.2019.07.048] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 07/08/2019] [Accepted: 07/23/2019] [Indexed: 11/28/2022] Open
Abstract
Roughly half of a cell's proteins are located at or near the plasma membrane. In this restricted space, the cell senses its environment, signals to its neighbors, and exchanges cargo through exo- and endocytotic mechanisms. Ligands bind to receptors, ions flow across channel pores, and transmitters and metabolites are transported against concentration gradients. Receptors, ion channels, pumps, and transporters are the molecular substrates of these biological processes, and they constitute important targets for drug discovery. Total internal reflection fluorescence (TIRF) microscopy suppresses the background from the cell's deeper layers and provides contrast for selectively imaging dynamic processes near the basal membrane of live cells. The optical sectioning of TIRF is based on the excitation confinement of the evanescent wave generated at the glass/cell interface. How deep the excitation light actually penetrates the sample is difficult to know, making the quantitative interpretation of TIRF data problematic. Nevertheless, many applications like superresolution microscopy, colocalization, Förster resonance energy transfer, near-membrane fluorescence recovery after photobleaching, uncaging or photoactivation/switching as well as single-particle tracking require the quantitative interpretation of evanescent-wave-excited images. Here, we review existing techniques for characterizing evanescent fields, and we provide a roadmap for comparing TIRF data across images, experiments, and laboratories.
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Affiliation(s)
- Martin Oheim
- Université de Paris, CNRS, Saints-Pères Paris Institute for the Neurosciences (SPPIN), Paris, France.
| | - Adi Salomon
- Department of Chemistry, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat Gan, Israel
| | - Adam Weissman
- Department of Chemistry, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat Gan, Israel
| | - Maia Brunstein
- Université de Paris, CNRS, Saints-Pères Paris Institute for the Neurosciences (SPPIN), Paris, France; Chaire d'Excellence Junior, Université Sorbonne Paris Cité, Paris, France
| | - Ute Becherer
- Saarland University, Department of Physiology, CIPMM, Homburg/Saar, Germany
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19
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Liu B, Hobson CM, Pimenta FM, Nelsen E, Hsiao J, O'Brien T, Falvo MR, Hahn KM, Superfine R. VIEW-MOD: a versatile illumination engine with a modular optical design for fluorescence microscopy. OPTICS EXPRESS 2019; 27:19950-19972. [PMID: 31503749 DOI: 10.1364/oe.27.019950] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 06/19/2019] [Indexed: 05/18/2023]
Abstract
We developed VIEW-MOD (Versatile Illumination Engine with a Modular Optical Design): a compact, multi-modality microscope, which accommodates multiple illumination schemes including variable angle total internal reflection, point scanning and vertical/horizontal light sheet. This system allows combining and flexibly switching between different illuminations and imaging modes by employing three electrically tunable lenses and two fast-steering mirrors. This versatile optics design provides control of 6 degrees of freedom of the illumination source (3 translation, 2 tilt, and beam shape) plus the axial position of the imaging plane. We also developed standalone software with an easy-to-use GUI to calibrate and control the microscope. We demonstrate the applications of this system and software in biosensor imaging, optogenetics and fast 3D volume imaging. This system is ready to fit into complex imaging circumstances requiring precise control of illumination and detection paths, and has a broad scope of usability for a myriad of biological applications.
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20
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Fourriere L, Kasri A, Gareil N, Bardin S, Bousquet H, Pereira D, Perez F, Goud B, Boncompain G, Miserey-Lenkei S. RAB6 and microtubules restrict protein secretion to focal adhesions. J Cell Biol 2019; 218:2215-2231. [PMID: 31142554 PMCID: PMC6605799 DOI: 10.1083/jcb.201805002] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 03/13/2019] [Accepted: 05/02/2019] [Indexed: 12/23/2022] Open
Abstract
Fourriere et al. demonstrate the existence of secretion hotspots juxtaposed to focal adhesions. Post-Golgi transport carriers use a subset of microtubules to reach focal adhesions. RAB6 acts as a general regulator of post-Golgi secretion and, together with ELKS, restricts protein secretion at focal adhesions. To ensure their homeostasis and sustain differentiated functions, cells continuously transport diverse cargos to various cell compartments and in particular to the cell surface. Secreted proteins are transported along intracellular routes from the endoplasmic reticulum through the Golgi complex before reaching the plasma membrane along microtubule tracks. Using a synchronized secretion assay, we report here that exocytosis does not occur randomly at the cell surface but on localized hotspots juxtaposed to focal adhesions. Although microtubules are involved, the RAB6-dependent machinery plays an essential role. We observed that, irrespective of the transported cargos, most post-Golgi carriers are positive for RAB6 and that its inactivation leads to a broad reduction of protein secretion. RAB6 may thus be a general regulator of post-Golgi secretion.
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Affiliation(s)
- Lou Fourriere
- Dynamics of Intracellular Organization Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - Amal Kasri
- Molecular Mechanisms of Intracellular Transport Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - Nelly Gareil
- Dynamics of Intracellular Organization Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - Sabine Bardin
- Molecular Mechanisms of Intracellular Transport Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - Hugo Bousquet
- Molecular Mechanisms of Intracellular Transport Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - David Pereira
- Molecular Mechanisms of Intracellular Transport Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - Franck Perez
- Dynamics of Intracellular Organization Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - Bruno Goud
- Molecular Mechanisms of Intracellular Transport Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - Gaelle Boncompain
- Dynamics of Intracellular Organization Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - Stéphanie Miserey-Lenkei
- Molecular Mechanisms of Intracellular Transport Laboratory, Institut Curie, PSL Research University, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 144, Paris, France
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21
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E-syt1 Re-arranges STIM1 Clusters to Stabilize Ring-shaped ER-PM Contact Sites and Accelerate Ca 2+ Store Replenishment. Sci Rep 2019; 9:3975. [PMID: 30850711 PMCID: PMC6408583 DOI: 10.1038/s41598-019-40331-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 01/31/2019] [Indexed: 12/02/2022] Open
Abstract
In many non-excitable cells, the depletion of endoplasmic reticulum (ER) Ca2+ stores leads to the dynamic formation of membrane contact sites (MCSs) between the ER and the plasma membrane (PM), which activates the store-operated Ca2+ entry (SOCE) to refill the ER store. Two different Ca2+-sensitive proteins, STIM1 and extended synaptotagmin-1 (E-syt1), are activated during this process. Due to the lack of live cell super-resolution imaging, how MCSs are dynamically regulated by STIM1 and E-syt1 coordinately during ER Ca2+ store depletion and replenishment remain unknown. With home-built super-resolution microscopes that provide superior axial and lateral resolution in live cells, we revealed that extracellular Ca2+ influx via SOCE activated E-syt1s to move towards the PM by ~12 nm. Unexpectedly, activated E-syt1s did not constitute the MCSs per se, but re-arranged neighboring ER structures into ring-shaped MCSs (230~280 nm in diameter) enclosing E-syt1 puncta, which helped to stabilize MCSs and accelerate local ER Ca2+ replenishment. Overall, we have demonstrated different roles of STIM1 and E-syt1 in MCS formation regulation, SOCE activation and ER Ca2+ store replenishment.
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22
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Kuai Y, Chen J, Tang X, Xiang Y, Lu F, Kuang C, Xu L, Shen W, Cheng J, Gui H, Zou G, Wang P, Ming H, Liu J, Liu X, Lakowicz JR, Zhang D. Label-free surface-sensitive photonic microscopy with high spatial resolution using azimuthal rotation illumination. SCIENCE ADVANCES 2019; 5:eaav5335. [PMID: 30944860 PMCID: PMC6440756 DOI: 10.1126/sciadv.aav5335] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 02/07/2019] [Indexed: 05/02/2023]
Abstract
Surface plasmon resonance microscopy (SPRM) with single-direction illumination is a powerful platform for biomedical imaging because of its wide-field, label-free, and high-surface-sensitivity imaging capabilities. However, two disadvantages prevent wider use of SPRM. The first is its poor spatial resolution that can be as large as several micrometers. The second is that SPRM requires use of metal films as sample substrates; this introduces working wavelength limitations. In addition, cell culture growth on metal films is not as universally available as growth on dielectric substrates. Here we show that use of azimuthal rotation illumination allows SPRM spatial resolution to be enhanced by up to an order of magnitude. The metal film can also be replaced by a dielectric multilayer and then a different label-free surface-sensitive photonic microscopy is developed, which has more choices in terms of the working wavelength, polarization, and imaging section, and will bring opportunities for applications in biology.
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Affiliation(s)
- Yan Kuai
- Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Junxue Chen
- School of Science, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Xi Tang
- Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yifeng Xiang
- Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Fengya Lu
- Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Cuifang Kuang
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Liang Xu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Weidong Shen
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Junjie Cheng
- Department of Polymer Science and Engineering, iChEM, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Huaqiao Gui
- Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
| | - Gang Zou
- Department of Polymer Science and Engineering, iChEM, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Pei Wang
- Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Hai Ming
- Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jianguo Liu
- Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
| | - Xu Liu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Joseph R. Lakowicz
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology University of Maryland School of Medicine, 725 West Lombard St., Baltimore, MD 21201, USA
| | - Douguo Zhang
- Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
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Fan J, Huang X, Li L, Chen L, Tan S. One-step deconvolution for multi-angle TIRF microscopy with enhanced resolution. BIOMEDICAL OPTICS EXPRESS 2019; 10:1097-1110. [PMID: 30891332 PMCID: PMC6420288 DOI: 10.1364/boe.10.001097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 01/08/2019] [Accepted: 01/11/2019] [Indexed: 06/09/2023]
Abstract
Total internal reflection fluorescence microscopy (TIRF microscopy) uses a rapid decay of evanescent waves to excite fluorophores within several hundred nanometers (nm) beneath the plasma membrane, which can effectively suppress excitation of fluorescence signals in the deep layers. From image stacks obtained with a plurality of different incident angles, a three-dimensional spatial structure of the observed sample can be reconstructed by a Multi-Angle-TIRF (MA-TIRF) algorithm that provides an axial resolution of ~50 nm. Taking into account the point spread function (PSF) of the TIRF microscopes, we further increase its lateral resolution by introducing a fast deconvolution algorithm into the reconstruction of MA-TIRF data (DMA-TIRF), which is approached in just one step of minimizing the reconstruction function. We also introduce a TV regularization term in the deconvolution algorithm to suppress artifacts induced by the excessive noise. Therefore, based on the hardware of existing MA-TIRF microscopes, the proposed DMA-TIRF algorithm has achieved lateral and axial resolutions of ~200 and ~50 nm, respectively.
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Affiliation(s)
- Junchao Fan
- Key Laboratory of Image Processing and Intelligent Control of Ministry of Education of China, School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China
- J.F., X. H. and L.L. contributed equally to this work
| | - Xiaoshuai Huang
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking University, Beijing 100871, China
- J.F., X. H. and L.L. contributed equally to this work
| | - Liuju Li
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking University, Beijing 100871, China
- J.F., X. H. and L.L. contributed equally to this work
| | - Liangyi Chen
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking University, Beijing 100871, China
| | - Shan Tan
- Key Laboratory of Image Processing and Intelligent Control of Ministry of Education of China, School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China
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24
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Soubies E, Radwanska A, Grall D, Blanc-Féraud L, Van Obberghen-Schilling E, Schaub S. Nanometric axial resolution of fibronectin assembly units achieved with an efficient reconstruction approach for multi-angle-TIRF microscopy. Sci Rep 2019; 9:1926. [PMID: 30760745 PMCID: PMC6374485 DOI: 10.1038/s41598-018-36119-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 11/08/2018] [Indexed: 02/01/2023] Open
Abstract
High resolution imaging of molecules at the cell-substrate interface is required for understanding key biological processes. Here we propose a complete pipeline for multi-angle total internal reflection fluorescence microscopy (MA-TIRF) going from instrument design and calibration procedures to numerical reconstruction. Our custom setup is endowed with a homogeneous field illumination and precise excitation beam angle. Given a set of MA-TIRF acquisitions, we deploy an efficient joint deconvolution/reconstruction algorithm based on a variational formulation of the inverse problem. This algorithm offers the possibility of using various regularizations and can run on graphics processing unit (GPU) for rapid reconstruction. Moreover, it can be easily used with other MA-TIRF devices and we provide it as an open-source software. This ensemble has enabled us to visualize and measure with unprecedented nanometric resolution, the depth of molecular components of the fibronectin assembly machinery at the basal surface of endothelial cells.
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Affiliation(s)
- Emmanuel Soubies
- Université Côte d'Azur, CNRS, Inria, I3S, France. .,Biomedical Imaging Group, EPFL, Lausanne, Switzerland.
| | | | | | | | | | - Sébastien Schaub
- Université Côte d'Azur, CNRS, Inria, I3S, France. .,Université Côte d'Azur, CNRS, Inserm, iBV, France.
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25
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Li J, Han W, Li Y, Chen Y, Shang Y, Chen Y, Gui Z. Inverse problem based on the fast alternating direction method of multipliers algorithm in multiangle total internal reflection fluorescence microscopy. APPLIED OPTICS 2018; 57:9828-9834. [PMID: 30462018 DOI: 10.1364/ao.57.009828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 10/22/2018] [Indexed: 06/09/2023]
Abstract
Multiangle total internal reflection fluorescence microscopy (TIRFM) has become one of the most important techniques for achieving axial superresolution. The key process in this technique is solving the inverse problem. This paper applies an improved alternating direction method of multipliers algorithm to solve the inverse problem and validates the accuracy of the algorithm by reconstructing simulated microtubule structures in multiangle TIRFM images. The reconstruction times for different algorithms and the convergence speeds of the improved and original algorithms are compared. Experimental results show that the improved algorithm can achieve an axial resolution of 40 nm, reduce the influence of the penalty parameter on convergence, and improve the convergence speed of the iterative process while ensuring image reconstruction quality. Based on the algorithm, a three-dimensional image with the depth information of microtubules and mitochondria is reconstructed.
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26
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Chen Y, Liu W, Zhang Z, Zheng C, Huang Y, Cao R, Zhu D, Xu L, Zhang M, Zhang YH, Fan J, Jin L, Xu Y, Kuang C, Liu X. Multi-color live-cell super-resolution volume imaging with multi-angle interference microscopy. Nat Commun 2018; 9:4818. [PMID: 30446673 PMCID: PMC6240104 DOI: 10.1038/s41467-018-07244-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 10/23/2018] [Indexed: 12/17/2022] Open
Abstract
Imaging and tracking of near-surface three-dimensional volumetric nanoscale dynamic processes of live cells remains a challenging problem. In this paper, we propose a multi-color live-cell near-surface-volume super-resolution microscopy method that combines total internal reflection fluorescence structured illumination microscopy with multi-angle evanescent light illumination. We demonstrate that our approach of multi-angle interference microscopy is perfectly adapted to studying subcellular dynamics of mitochondria and microtubule architectures during cell migration. 3D super-resolution imaging of dynamic processes in live cells is still challenging, especially in a large field of view. Here the authors combine SIM with multi-angle evanescent light illumination and achieve improved lateral and axial resolution, with stack acquisition time in the range of 1–2 s.
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Affiliation(s)
- Youhua Chen
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.,Shanxi Provincial Key Laboratory for Biomedical Imaging and Big Data, North University of China, Taiyuan, Shanxi, 030051, China
| | - Wenjie Liu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Zhimin Zhang
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Cheng Zheng
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Yujia Huang
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Ruizhi Cao
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Dazhao Zhu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Liang Xu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Meng Zhang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China
| | - Yu-Hui Zhang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China
| | - Jiannan Fan
- Key Laboratory for Biomedical Engineering of Ministry of Education, Department of Biomedical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Luhong Jin
- Key Laboratory for Biomedical Engineering of Ministry of Education, Department of Biomedical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yingke Xu
- Key Laboratory for Biomedical Engineering of Ministry of Education, Department of Biomedical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Cuifang Kuang
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China. .,Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, 030006, China.
| | - Xu Liu
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China. .,Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, 030006, China.
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27
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Guo Y, Li D, Zhang S, Yang Y, Liu JJ, Wang X, Liu C, Milkie DE, Moore RP, Tulu US, Kiehart DP, Hu J, Lippincott-Schwartz J, Betzig E, Li D. Visualizing Intracellular Organelle and Cytoskeletal Interactions at Nanoscale Resolution on Millisecond Timescales. Cell 2018; 175:1430-1442.e17. [DOI: 10.1016/j.cell.2018.09.057] [Citation(s) in RCA: 290] [Impact Index Per Article: 48.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 07/21/2018] [Accepted: 09/26/2018] [Indexed: 11/26/2022]
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28
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Dejardin MJ, Hemmerle A, Sadoun A, Hamon Y, Puech PH, Sengupta K, Limozin L. Lamellipod Reconstruction by Three-Dimensional Reflection Interference Contrast Nanoscopy (3D-RICN). NANO LETTERS 2018; 18:6544-6550. [PMID: 30179011 DOI: 10.1021/acs.nanolett.8b03134] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
There are very few techniques to reconstruct the shape of a cell at nanometric resolution, and those that exist are almost exclusively based on fluorescence, implying limitations due to staining constraints and artifacts. Reflection interference contrast microscopy (RICM), a label-free technique, permits the measurement of nanometric distances between refractive objects. However, its quantitative application to cells has been largely limited due to the complex interferometric pattern caused by multiple reflections on internal or thin structures like lamellipodia. Here we introduce 3D reflection interference contrast nanoscopy, 3D-RICN, which combines information from multiple illumination wavelengths and aperture angles to characterize the lamellipodial region of an adherent cell in terms of its distance from the surface and its thickness. We validate this new method by comparing data obtained on fixed cells imaged with atomic force microscopy and quantitative phase imaging. We show that as expected, cells adhering to micropatterns exhibit a radial symmetry for the lamellipodial thickness. We demonstrate that the substrate-lamellipod distance may be as high as 100 nm. We also show how the method applies to living cells, opening the way for label-free dynamical study of cell structures with nanometric resolution.
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Affiliation(s)
| | | | - Anaïs Sadoun
- Aix Marseille Univ , CNRS, INSERM, LAI , Marseille 13288 , France
| | - Yannick Hamon
- Aix Marseille Univ , CNRS, INSERM, CIML , Marseille 13288 , France
| | | | - Kheya Sengupta
- Aix Marseille Univ , CNRS, CINAM , Marseille 13288 , France
| | - Laurent Limozin
- Aix Marseille Univ , CNRS, INSERM, LAI , Marseille 13288 , France
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29
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Liu J, Kong C, Li Q, Zhao W, Li M, Gao S, Liu C, Tan J. Artifact-free, penetration-adjustable elliptical-mirror-based TIRF microscopy. OPTICS EXPRESS 2018; 26:26065-26079. [PMID: 30469699 DOI: 10.1364/oe.26.026065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 09/13/2018] [Indexed: 06/09/2023]
Abstract
Evanescent field distribution in the focal region of the elliptical-mirror-based total-internal-reflection fluorescence (e-TIRF) microscopy is analyzed based on vectorial diffraction theory. The simulation demonstrates that the intensity of an evanescent field generated by elliptical mirror decreases exponentially with the penetration depth, and the polarization characteristic of the evanescent wave in various directions is given. We build up an e-TIRF microscope utilizing a focused hollow-cone illumination with all-direction and large range of incidence. The experiment shows the artifact effect can be well suppressed by using the azimuthal-direction illumination method. In addition, the penetration depth of the evanescent field can be controlled by adjusting the sizes of the aperture and obstruction with a large range.
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30
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Pécot T, Zengzhen L, Boulanger J, Salamero J, Kervrann C. A quantitative approach for analyzing the spatio-temporal distribution of 3D intracellular events in fluorescence microscopy. eLife 2018; 7:32311. [PMID: 30091700 PMCID: PMC6085121 DOI: 10.7554/elife.32311] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 06/08/2018] [Indexed: 12/14/2022] Open
Abstract
Analysis of the spatial distribution of endomembrane trafficking is fundamental to understand the mechanisms controlling cellular dynamics, cell homeostasy, and cell interaction with its external environment in normal and pathological situations. We present a semi-parametric framework to quantitatively analyze and visualize the spatio-temporal distribution of intracellular events from different conditions. From the spatial coordinates of intracellular features such as segmented subcellular structures or vesicle trajectories, QuantEv automatically estimates weighted densities that are easy to interpret and performs a comprehensive statistical analysis from distribution distances. We apply this approach to study the spatio-temporal distribution of moving Rab6 fluorescently labeled membranes with respect to their direction of movement in crossbow- and disk-shaped cells. We also investigate the position of the generating hub of Rab11-positive membranes and the effect of actin disruption on Rab11 trafficking in coordination with cell shape. Proteins are the workhorses of the body, performing a range of roles that are essential for life. Often, this requires these molecules to move from one location to another inside a cell. Scientists are interested in following an individual protein in a living cell ‘in real time’, as this helps understand what this protein does. Scientists can track the whereabouts of a protein by ‘tagging’ it with a fluorescent molecule that emits light which can be picked up by a powerful microscope. This process is repeated many times on different samples. Finally, researchers have to analyze all the resulting images, and conduct statistical analysis to draw robust conclusions about the overall trajectories of the proteins. This process often relies on experts assessing the images, and it is therefore time-consuming and not easily scalable or applied to other experiments. To help with this, Pécot et al. have developed QuantEV, a free algorithm that can analyze proteins’ paths within a cell, and then return statistical graphs and 3D visualizations. The program also gives access to the statistical procedure that was used, which means that different experiments can be compared. Pécot et al. used the method to follow the Rab6 protein in cells of different shapes, and found that the conformation of the cell influences where Rab6 is located. For example, in crossbow-shaped cells, Rab6 is found more often toward the three tips of the crossbow, while its distribution is uniform in cells that look like disks. Another experiment examined where the protein Rab11 is normally placed, and how this changes when the cell’s skeleton is artificially disrupted. Both studies help to gain an insight into the behavior of the cellular structures in which Rab6 and Rab11 are embedded. Following proteins in the cell is an increasingly popular method, and there is therefore a growing amount of data to process. QuantEV should make it easier for biologists to analyze their results, which could help them to have a better grasp on how cells work in various circumstances.
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Affiliation(s)
- Thierry Pécot
- Serpico Team-Project, Inria, Centre Rennes-Bretagne Atlantique, Rennes, France
| | - Liu Zengzhen
- CNRS UMR 144, Space Time Imaging of Endomembranes Dynamics Team, PSL Research University, Institut Curie, Paris, France
| | - Jérôme Boulanger
- CNRS UMR 144, Space Time Imaging of Endomembranes Dynamics Team, PSL Research University, Institut Curie, Paris, France
| | - Jean Salamero
- CNRS UMR 144, Space Time Imaging of Endomembranes Dynamics Team, PSL Research University, Institut Curie, Paris, France.,Cell and Tissue Imaging Facility, IBiSA, Institut Curie, Paris, France
| | - Charles Kervrann
- Serpico Team-Project, Inria, Centre Rennes-Bretagne Atlantique, Rennes, France
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31
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Niederauer C, Blumhardt P, Mücksch J, Heymann M, Lambacher A, Schwille P. Direct characterization of the evanescent field in objective-type total internal reflection fluorescence microscopy. OPTICS EXPRESS 2018; 26:20492-20506. [PMID: 30119359 DOI: 10.1364/oe.26.020492] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 07/08/2018] [Indexed: 05/22/2023]
Abstract
Total internal reflection fluorescence (TIRF) microscopy is a commonly used method for studying fluorescently labeled molecules in close proximity to a surface. Usually, the TIRF axial excitation profile is assumed to be single-exponential with a characteristic penetration depth, governed by the incident angle of the excitation laser beam towards the optical axis. However, in practice, the excitation profile does not only comprise the theoretically predicted single-exponential evanescent field, but also an additional non-evanescent contribution, supposedly caused by scattering within the optical path or optical aberrations. We developed a calibration slide to directly characterize the TIRF excitation field. Our slide features ten height steps ranging from 25 to 550 nanometers, fabricated from a polymer with a refractive index matching that of water. Fluorophores in aqueous solution above the polymer step layers sample the excitation profile at different heights. The obtained excitation profiles confirm the theoretically predicted exponential decay over increasing step heights as well as the presence of a non-evanescent contribution.
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32
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Mandracchia B, Gennari O, Bramanti A, Grilli S, Ferraro P. Label-free quantification of the effects of lithium niobate polarization on cell adhesion via holographic microscopy. JOURNAL OF BIOPHOTONICS 2018; 11:e201700332. [PMID: 29405583 DOI: 10.1002/jbio.201700332] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 01/31/2018] [Indexed: 06/07/2023]
Abstract
The surface of a c- cut ferroelectric crystal at room temperature is characterized by the so-called screening surface charges, able to compensate the charge due to the spontaneous polarization. Recently, these charges inspired the investigation of the interaction affinity of live cells with lithium niobate and lithium tantalate crystals. However, different knowledge gaps still remain that prevent a reasonable application of these materials for biological applications. Here, a label-free holographic total internal reflection microscopy is shown; the technique is able to evaluate quantitatively the contact area of live fibroblast cells adhering onto the surface of a ferroelectric lithium niobate crystal. The results show values of contact area significantly different between cells adhering onto the positive or negative face of the crystal. This reinforces the reasons for using the polarization charge of these materials to study and/or control cellular processes and, thus, to develop an innovative platform based on polar dielectric functional substrates.
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Affiliation(s)
- Biagio Mandracchia
- Institute of Applied Sciences and Intelligent Systems of the National Research Council (CNR-ISASI), Pozzuoli, Naples, Italy
| | - Oriella Gennari
- Institute of Applied Sciences and Intelligent Systems of the National Research Council (CNR-ISASI), Pozzuoli, Naples, Italy
| | - Alessia Bramanti
- Institute of Applied Sciences and Intelligent Systems of the National Research Council (CNR-ISASI), Pozzuoli, Naples, Italy
| | - Simonetta Grilli
- Institute of Applied Sciences and Intelligent Systems of the National Research Council (CNR-ISASI), Pozzuoli, Naples, Italy
| | - Pietro Ferraro
- Institute of Applied Sciences and Intelligent Systems of the National Research Council (CNR-ISASI), Pozzuoli, Naples, Italy
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33
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Fortun D, Guichard P, Hamel V, Sorzano COS, Banterle N, Gonczy P, Unser M. Reconstruction From Multiple Particles for 3D Isotropic Resolution in Fluorescence Microscopy. IEEE TRANSACTIONS ON MEDICAL IMAGING 2018; 37:1235-1246. [PMID: 29727286 DOI: 10.1109/tmi.2018.2795464] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The imaging of proteins within macromolecular complexes has been limited by the low axial resolution of optical microscopes. To overcome this problem, we propose a novel computational reconstruction method that yields isotropic resolution in fluorescence imaging. The guiding principle is to reconstruct a single volume from the observations of multiple rotated particles. Our new operational framework detects particles, estimates their orientation, and reconstructs the final volume. The main challenge comes from the absence of initial template and a priori knowledge about the orientations. We formulate the estimation as a blind inverse problem, and propose a block-coordinate stochastic approach to solve the associated non-convex optimization problem. The reconstruction is performed jointly in multiple channels. We demonstrate that our method is able to reconstruct volumes with 3D isotropic resolution on simulated data. We also perform isotropic reconstructions from real experimental data of doubly labeled purified human centrioles. Our approach revealed the precise localization of the centriolar protein Cep63 around the centriole microtubule barrel. Overall, our method offers new perspectives for applications in biology that require the isotropic mapping of proteins within macromolecular assemblies.
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34
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Zheng C, Zhao G, Liu W, Chen Y, Zhang Z, Jin L, Xu Y, Kuang C, Liu X. Three-dimensional super-resolved live cell imaging through polarized multi-angle TIRF. OPTICS LETTERS 2018; 43:1423-1426. [PMID: 29600995 DOI: 10.1364/ol.43.001423] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 02/15/2018] [Indexed: 05/21/2023]
Abstract
Measuring three-dimensional nanoscale cellular structures is challenging, especially when the structure is dynamic. Owing to the informative total internal reflection fluorescence (TIRF) imaging under varied illumination angles, multi-angle (MA) TIRF has been examined to offer a nanoscale axial and a subsecond temporal resolution. However, conventional MA-TIRF still performs badly in lateral resolution and fails to characterize the depth image in densely distributed regions. Here, we emphasize the lateral super-resolution in the MA-TIRF, exampled by simply introducing polarization modulation into the illumination procedure. Equipped with a sparsity and accelerated proximal algorithm, we examine a more precise 3D sample structure compared with previous methods, enabling live cell imaging with a temporal resolution of 2 s and recovering high-resolution mitochondria fission and fusion processes. We also shared the recovery program, which is the first open-source recovery code for MA-TIRF, to the best of our knowledge.
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35
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Bademosi AT, Lauwers E, Amor R, Verstreken P, van Swinderen B, Meunier FA. In Vivo Single-Molecule Tracking at the Drosophila Presynaptic Motor Nerve Terminal. J Vis Exp 2018. [PMID: 29364242 PMCID: PMC5908646 DOI: 10.3791/56952] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
An increasing number of super-resolution microscopy techniques are helping to uncover the mechanisms that govern the nanoscale cellular world. Single-molecule imaging is gaining momentum as it provides exceptional access to the visualization of individual molecules in living cells. Here, we describe a technique that we developed to perform single-particle tracking photo-activated localization microscopy (sptPALM) in Drosophila larvae. Synaptic communication relies on key presynaptic proteins that act by docking, priming, and promoting the fusion of neurotransmitter-containing vesicles with the plasma membrane. A range of protein-protein and protein-lipid interactions tightly regulates these processes and the presynaptic proteins therefore exhibit changes in mobility associated with each of these key events. Investigating how mobility of these proteins correlates with their physiological function in an intact live animal is essential to understanding their precise mechanism of action. Extracting protein mobility with high resolution in vivo requires overcoming limitations such as optical transparency, accessibility, and penetration depth. We describe how photoconvertible fluorescent proteins tagged to the presynaptic protein Syntaxin-1A can be visualized via slight oblique illumination and tracked at the motor nerve terminal or along the motor neuron axon of the third instar Drosophila larva.
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Affiliation(s)
- Adekunle T Bademosi
- Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute, The University of Queensland
| | - Elsa Lauwers
- VIB Centre for Brain and Disease Research, KU Leuven Department of Neurosciences, Leuven Institute for Neurodegenerative Disease (LIND)
| | - Rumelo Amor
- Queensland Brain Institute, The University of Queensland
| | - Patrik Verstreken
- VIB Centre for Brain and Disease Research, KU Leuven Department of Neurosciences, Leuven Institute for Neurodegenerative Disease (LIND)
| | | | - Frédéric A Meunier
- Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute, The University of Queensland;
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36
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Mandracchia B, Gennari O, Marchesano V, Paturzo M, Ferraro P. Label free imaging of cell-substrate contacts by holographic total internal reflection microscopy. JOURNAL OF BIOPHOTONICS 2017; 10:1163-1170. [PMID: 27804236 DOI: 10.1002/jbio.201600177] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 08/31/2016] [Accepted: 10/04/2016] [Indexed: 05/25/2023]
Abstract
The study of cell adhesion contacts is pivotal to understand cell mechanics and interaction at substrates or chemical and physical stimuli. We designed and built a HoloTIR microscope for label-free quantitative phase imaging of total internal reflection. Here we show for the first time that HoloTIR is a good choice for label-free study of focal contacts and of cell/substrate interaction as its sensitivity is enhanced in comparison with standard TIR microscopy. Finally, the simplicity of implementation and relative low cost, due to the requirement of less optical components, make HoloTIR a reasonable alternative, or even an addition, to TIRF microscopy for mapping cell/substratum topography. As a proof of concept, we studied the formation of focal contacts of fibroblasts on three substrates with different levels of affinity for cell adhesion.
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Affiliation(s)
- Biagio Mandracchia
- CNR - ISASI Institute of Applied Sciences and Intelligent Systems, Via Campi Flegrei 34, 80078, Pozzuoli, Napoli, Italy
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale - DICMAPI, University of Naples Federico II, Piazzale Tecchio 80, 80100, Napoli, Italy
| | - Oriella Gennari
- CNR - ISASI Institute of Applied Sciences and Intelligent Systems, Via Campi Flegrei 34, 80078, Pozzuoli, Napoli, Italy
| | - Valentina Marchesano
- CNR - ISASI Institute of Applied Sciences and Intelligent Systems, Via Campi Flegrei 34, 80078, Pozzuoli, Napoli, Italy
| | - Melania Paturzo
- CNR - ISASI Institute of Applied Sciences and Intelligent Systems, Via Campi Flegrei 34, 80078, Pozzuoli, Napoli, Italy
| | - Pietro Ferraro
- CNR - ISASI Institute of Applied Sciences and Intelligent Systems, Via Campi Flegrei 34, 80078, Pozzuoli, Napoli, Italy
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37
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Basset A, Bouthemy P, Boulanger J, Waharte F, Salamero J, Kervrann C. An extended model of vesicle fusion at the plasma membrane to estimate protein lateral diffusion from TIRF microscopy images. BMC Bioinformatics 2017; 18:352. [PMID: 28738814 PMCID: PMC5525284 DOI: 10.1186/s12859-017-1765-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 07/14/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Characterizing membrane dynamics is a key issue to understand cell exchanges with the extra-cellular medium. Total internal reflection fluorescence microscopy (TIRFM) is well suited to focus on the late steps of exocytosis at the plasma membrane. However, it is still a challenging task to quantify (lateral) diffusion and estimate local dynamics of proteins. RESULTS A new model was introduced to represent the behavior of cargo transmembrane proteins during the vesicle fusion to the plasma membrane at the end of the exocytosis process. Two biophysical parameters, the diffusion coefficient and the release rate parameter, are automatically estimated from TIRFM image sequences, to account for both the lateral diffusion of molecules at the membrane and the continuous release of the proteins from the vesicle to the plasma membrane. Quantitative evaluation on 300 realistic computer-generated image sequences demonstrated the efficiency and accuracy of the method. The application of our method on 16 real TIRFM image sequences additionally revealed differences in the dynamic behavior of Transferrin Receptor (TfR) and Langerin proteins. CONCLUSION An automated method has been designed to simultaneously estimate the diffusion coefficient and the release rate for each individual vesicle fusion event at the plasma membrane in TIRFM image sequences. It can be exploited for further deciphering cell membrane dynamics.
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Affiliation(s)
- Antoine Basset
- Inria, Campus de Beaulieu, Rennes, 35042 France
- CNES, 18 avenue Edouard Belin, Toulouse, 31401 France
| | | | - Jérôme Boulanger
- Institut Curie, PSL Research University, CNRS UMR 144 and PICT-Cell and Tissue Imaging Facility, 12 rue Lhomond, Paris, 75005 France
- MRC Laboratory of Molecular Biology, University of Cambridge, Francis Crick Avenue, CBC Cambridge Biomedical Campus, Cambridge, CB2 0QH UK
| | - François Waharte
- Institut Curie, PSL Research University, CNRS UMR 144 and PICT-Cell and Tissue Imaging Facility, 12 rue Lhomond, Paris, 75005 France
| | - Jean Salamero
- Institut Curie, PSL Research University, CNRS UMR 144 and PICT-Cell and Tissue Imaging Facility, 12 rue Lhomond, Paris, 75005 France
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38
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Cardoso Dos Santos M, Déturche R, Vézy C, Jaffiol R. Topography of Cells Revealed by Variable-Angle Total Internal Reflection Fluorescence Microscopy. Biophys J 2017; 111:1316-1327. [PMID: 27653490 DOI: 10.1016/j.bpj.2016.06.043] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/24/2016] [Accepted: 06/28/2016] [Indexed: 11/17/2022] Open
Abstract
We propose an improved version of variable-angle total internal reflection fluorescence microscopy (vaTIRFM) adapted to modern TIRF setup. This technique involves the recording of a stack of TIRF images, by gradually increasing the incident angle of the light beam on the sample. A comprehensive theory was developed to extract the membrane/substrate separation distance from fluorescently labeled cell membranes. A straightforward image processing was then established to compute the topography of cells with a nanometric axial resolution, typically 10-20 nm. To highlight the new opportunities offered by vaTIRFM to quantify adhesion process of motile cells, adhesion of MDA-MB-231 cancer cells on glass substrate coated with fibronectin was examined.
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Affiliation(s)
- Marcelina Cardoso Dos Santos
- Laboratoire de Nanotechnologie et d'Instrumentation Optique, Institut Charles Delaunay - UMR 6281 Centre National de la Recherche Scientifique, Université de Technologie de Troyes, Troyes, France
| | - Régis Déturche
- Laboratoire de Nanotechnologie et d'Instrumentation Optique, Institut Charles Delaunay - UMR 6281 Centre National de la Recherche Scientifique, Université de Technologie de Troyes, Troyes, France
| | - Cyrille Vézy
- Laboratoire de Nanotechnologie et d'Instrumentation Optique, Institut Charles Delaunay - UMR 6281 Centre National de la Recherche Scientifique, Université de Technologie de Troyes, Troyes, France
| | - Rodolphe Jaffiol
- Laboratoire de Nanotechnologie et d'Instrumentation Optique, Institut Charles Delaunay - UMR 6281 Centre National de la Recherche Scientifique, Université de Technologie de Troyes, Troyes, France.
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39
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Liu J, Li Q, Li M, Gao S, Liu C, Zou L, Tan J. Elliptical mirror-based TIRF microscopy with shadowless illumination and adjustable penetration depth. OPTICS LETTERS 2017; 42:2587-2590. [PMID: 28957291 DOI: 10.1364/ol.42.002587] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 05/31/2017] [Indexed: 06/07/2023]
Abstract
We propose an elliptical mirror-based total-internal-reflection fluorescence (e-TIRF) microscopy with shadowless illumination and adjustable penetration depth. The elliptical mirror is used to produce a hollow-cone illumination with all azimuthal directions and a large range of incident angle, so as to attenuate the potential shadow effects when utilizing a single-direction illumination, such as asymmetries and low contrast. The experiment demonstrates that the e-TIRF method can realize shadowless imaging with symmetric intensity distribution. Meanwhile, the penetration depth of e-TIRF can be theoretically adjusted from 58 nm to 250 nm by adjusting the size of the aperture or the position of an opaque mask. This method extends the minimum penetration depth, which is useful for high axial resolution.
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40
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Masuda S, Yanase Y, Usukura E, Ryuzaki S, Wang P, Okamoto K, Kuboki T, Kidoaki S, Tamada K. High-resolution imaging of a cell-attached nanointerface using a gold-nanoparticle two-dimensional sheet. Sci Rep 2017. [PMID: 28623338 PMCID: PMC5473937 DOI: 10.1038/s41598-017-04000-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
This paper proposes a simple, effective, non-scanning method for the visualization of a cell-attached nanointerface. The method uses localized surface plasmon resonance (LSPR) excited homogeneously on a two-dimensional (2D) self-assembled gold-nanoparticle sheet. The LSPR of the gold-nanoparticle sheet provides high-contrast interfacial images due to the confined light within a region a few tens of nanometers from the particles and the enhancement of fluorescence. Test experiments on rat basophilic leukemia (RBL-2H3) cells with fluorescence-labeled actin filaments revealed high axial and lateral resolution even under a regular epifluorescence microscope, which produced higher quality images than those captured under a total internal reflection fluorescence (TIRF) microscope. This non-scanning-type, high-resolution imaging method will be an effective tool for monitoring interfacial phenomena that exhibit relatively rapid reaction kinetics in various cellular and molecular dynamics.
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Affiliation(s)
- Shihomi Masuda
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Yuhki Yanase
- Graduate School of Biomedical & Health Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima City Hiroshima, 734-8553, Japan
| | - Eiji Usukura
- Graduate School of Science, Nagoya University, Nagoya, 464-8602, Japan
| | - Sou Ryuzaki
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Pangpang Wang
- Education Center for Global Leaders in Molecular Systems for Devices, Kyushu University, Fukuoka, 819-0395, Japan
| | - Koichi Okamoto
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Thasaneeya Kuboki
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Satoru Kidoaki
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Kaoru Tamada
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
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Pendharker S, Shende S, Newman W, Ogg S, Nazemifard N, Jacob Z. Axial super-resolution evanescent wave tomography. OPTICS LETTERS 2016; 41:5499-5502. [PMID: 27906223 DOI: 10.1364/ol.41.005499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Optical tomographic reconstruction of a three-dimensional (3D) nanoscale specimen is hindered by the axial diffraction limit, which is 2-3 times worse than the focal plane resolution. We propose and experimentally demonstrate an axial super-resolution evanescent wave tomography method that enables the use of regular evanescent wave microscopes like the total internal reflection fluorescence microscope beyond surface imaging and achieve a tomographic reconstruction with axial super-resolution. Our proposed method based on Fourier reconstruction achieves axial super-resolution by extracting information from multiple sets of 3D fluorescence images when the sample is illuminated by an evanescent wave. We propose a procedure to extract super-resolution features from the incremental penetration of an evanescent wave and support our theory by one-dimensional (along the optical axis) and 3D simulations. We validate our claims by experimentally demonstrating tomographic reconstruction of microtubules in HeLa cells with an axial resolution of ∼130 nm. Our method does not require any additional optical components or sample preparation. The proposed method can be combined with focal plane super-resolution techniques like stochastic optical reconstruction microscopy and can also be adapted for THz and microwave near-field tomography.
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Axial superresolution via multiangle TIRF microscopy with sequential imaging and photobleaching. Proc Natl Acad Sci U S A 2016; 113:4368-73. [PMID: 27044072 DOI: 10.1073/pnas.1516715113] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We report superresolution optical sectioning using a multiangle total internal reflection fluorescence (TIRF) microscope. TIRF images were constructed from several layers within a normal TIRF excitation zone by sequentially imaging and photobleaching the fluorescent molecules. The depth of the evanescent wave at different layers was altered by tuning the excitation light incident angle. The angle was tuned from the highest (the smallest TIRF depth) toward the critical angle (the largest TIRF depth) to preferentially photobleach fluorescence from the lower layers and allow straightforward observation of deeper structures without masking by the brighter signals closer to the coverglass. Reconstruction of the TIRF images enabled 3D imaging of biological samples with 20-nm axial resolution. Two-color imaging of epidermal growth factor (EGF) ligand and clathrin revealed the dynamics of EGF-activated clathrin-mediated endocytosis during internalization. Furthermore, Bayesian analysis of images collected during the photobleaching step of each plane enabled lateral superresolution (<100 nm) within each of the sections.
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43
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Nanoscale characterization of vesicle adhesion by normalized total internal reflection fluorescence microscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:1244-53. [PMID: 26972045 DOI: 10.1016/j.bbamem.2016.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 02/26/2016] [Accepted: 03/04/2016] [Indexed: 11/20/2022]
Abstract
We recently proposed a straightforward fluorescence microscopy technique to study adhesion of Giant Unilamellar Vesicles. This technique is based on dual observations which combine epi-fluorescence microscopy and total internal reflection fluorescence (TIRF) microscopy: TIRF images are normalized by epi-fluorescence ones. By this way, it is possible to map the membrane/substrate separation distance with a nanometric resolution, typically ~20 nm, with a maximal working range of 300-400 nm. The purpose of this paper is to demonstrate that this technique is useful to quantify vesicle adhesion from ultra-weak to strong membrane-surface interactions. Thus, we have examined unspecific and specific adhesion conditions. Concerning unspecific adhesion, we have controlled the strength of electrostatic forces between negatively charged vesicles and various functionalized surfaces which exhibit a positive or a negative effective charge. Specific adhesion was highlighted with lock-and-key forces mediated by the well defined biotin/streptavidin recognition.
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Diacylglycerol Guides the Hopping of Clathrin-Coated Pits along Microtubules for Exo-Endocytosis Coupling. Dev Cell 2015; 35:120-30. [PMID: 26439397 DOI: 10.1016/j.devcel.2015.09.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 08/05/2015] [Accepted: 09/10/2015] [Indexed: 01/01/2023]
Abstract
Many receptor-mediated endocytic processes are mediated by constitutive budding of clathrin-coated pits (CCPs) at spatially randomized sites before slowly pinching off from the plasma membrane (60-100 s). In contrast, clathrin-mediated endocytosis (CME) coupled with regulated exocytosis in excitable cells occurs at peri-exocytic sites shortly after vesicle fusion (∼10 s). The molecular mechanism underlying this spatiotemporal coupling remains elusive. We show that coupled endocytosis makes use of pre-formed CCPs, which hop to nascent fusion sites nearby following vesicle exocytosis. A dynamic cortical microtubular network, anchored at the cell surface by the cytoplasmic linker-associated protein on microtubules and the LL5β/ELKS complex on the plasma membrane, provides the track for CCP hopping. Local diacylglycerol gradients generated upon exocytosis guide the direction of hopping. Overall, the CCP-cytoskeleton-lipid interaction demonstrated here mediates exocytosis-coupled fast recycling of both plasma membrane and vesicular proteins, and it is required for the sustained exocytosis during repetitive stimulations.
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Fang Y. Total internal reflection fluorescence quantification of receptor pharmacology. BIOSENSORS-BASEL 2015; 5:223-40. [PMID: 25922915 PMCID: PMC4493547 DOI: 10.3390/bios5020223] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2015] [Revised: 04/15/2015] [Accepted: 04/17/2015] [Indexed: 12/30/2022]
Abstract
Total internal reflection fluorescence (TIRF) microscopy has been widely used as a single molecule imaging technique to study various fundamental aspects of cell biology, owing to its ability to selectively excite a very thin fluorescent volume immediately above the substrate on which the cells are grown. However, TIRF microscopy has found little use in high content screening due to its complexity in instrumental setup and experimental procedures. Inspired by the recent demonstration of label-free evanescent wave biosensors for cell phenotypic profiling and drug screening with high throughput, we had hypothesized and demonstrated that TIRF imaging is also amenable to receptor pharmacology profiling. This paper reviews key considerations and recent applications of TIRF imaging for pharmacology profiling.
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Affiliation(s)
- Ye Fang
- Biochemical Technologies, Science and Technology Division, Corning Incorporated, Corning, NY 14831, USA.
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