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Ye H, Xu X, Wang J, Wang J, He Y, Mu Y, Shi G. Polarization effects on the fluorescence emission of zebrafish neurons using light-sheet microscopy. BIOMEDICAL OPTICS EXPRESS 2022; 13:6733-6744. [PMID: 36589590 PMCID: PMC9774877 DOI: 10.1364/boe.474588] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 11/21/2022] [Accepted: 11/22/2022] [Indexed: 06/17/2023]
Abstract
Light-sheet fluorescence microscopy (LSFM) makes use of a thin plane of light to optically section and image transparent tissues or organisms in vivo, which has the advantages of fast imaging speed and low phototoxicity. In this paper, we have employed light-sheet microscopy to investigate the polarization effects on fluorescence emission of zebrafish neurons via modifying the electric oscillation orientation of the excitation light. The intensity of the fluorescence emission from the excited zebrafish larvae follows a cosine square function with respect to the polarization state of the excitation light and reveals a 40% higher fluorescence emission when the polarization orientation is orthogonal to the illumination and detection axes. Through registration and subtraction of fluorescence images under different polarization states, we have demonstrated that most of the enhanced fluorescence signals are from the neuronal cells rather than the extracellular substance. This provides us a way to distinguish the cell boundaries and observe the organism structures with improved contrast and resolution.
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Affiliation(s)
- Hong Ye
- Jiangsu Key Laboratory of Medical Optics,
Suzhou Institute of Biomedical Engineering and Technology,
Chinese Academy of Sciences, Suzhou,
China
| | - Xin Xu
- Jiangsu Key Laboratory of Medical Optics,
Suzhou Institute of Biomedical Engineering and Technology,
Chinese Academy of Sciences, Suzhou,
China
- School of Biomedical Engineering (Suzhou),
Division of Life Sciences and Medicine, University of
Science and Technology of China, Hefei, China
| | - Jixiang Wang
- Jiangsu Key Laboratory of Medical Optics,
Suzhou Institute of Biomedical Engineering and Technology,
Chinese Academy of Sciences, Suzhou,
China
- School of Biomedical Engineering (Suzhou),
Division of Life Sciences and Medicine, University of
Science and Technology of China, Hefei, China
| | - Jing Wang
- Jiangsu Key Laboratory of Medical Optics,
Suzhou Institute of Biomedical Engineering and Technology,
Chinese Academy of Sciences, Suzhou,
China
- School of Biomedical Engineering (Suzhou),
Division of Life Sciences and Medicine, University of
Science and Technology of China, Hefei, China
| | - Yi He
- Jiangsu Key Laboratory of Medical Optics,
Suzhou Institute of Biomedical Engineering and Technology,
Chinese Academy of Sciences, Suzhou,
China
| | - Yu Mu
- Institute of Neuroscience, State Key
Laboratory of Neuroscience, Center for Excellence in Brain Science and
Intelligence Technology, Chinese Academy of
Sciences, Shanghai, China
| | - Guohua Shi
- Jiangsu Key Laboratory of Medical Optics,
Suzhou Institute of Biomedical Engineering and Technology,
Chinese Academy of Sciences, Suzhou,
China
- School of Biomedical Engineering (Suzhou),
Division of Life Sciences and Medicine, University of
Science and Technology of China, Hefei, China
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2
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Faklaris O, Bancel-Vallée L, Dauphin A, Monterroso B, Frère P, Geny D, Manoliu T, de Rossi S, Cordelières FP, Schapman D, Nitschke R, Cau J, Guilbert T. Quality assessment in light microscopy for routine use through simple tools and robust metrics. J Biophys Biochem Cytol 2022; 221:213512. [PMID: 36173380 PMCID: PMC9526251 DOI: 10.1083/jcb.202107093] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 04/04/2022] [Accepted: 08/31/2022] [Indexed: 11/22/2022] Open
Abstract
Although there is a need to demonstrate reproducibility in light microscopy acquisitions, the lack of standardized guidelines monitoring microscope health status over time has so far impaired the widespread use of quality control (QC) measurements. As scientists from 10 imaging core facilities who encounter various types of projects, we provide affordable hardware and open source software tools, rigorous protocols, and define reference values to assess QC metrics for the most common fluorescence light microscopy modalities. Seven protocols specify metrics on the microscope resolution, field illumination flatness, chromatic aberrations, illumination power stability, stage drift, positioning repeatability, and spatial-temporal noise of camera sensors. We designed the MetroloJ_QC ImageJ/Fiji Java plugin to incorporate the metrics and automate analysis. Measurements allow us to propose an extensive characterization of the QC procedures that can be used by any seasoned microscope user, from research biologists with a specialized interest in fluorescence light microscopy through to core facility staff, to ensure reproducible and quantifiable microscopy results.
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Affiliation(s)
- Orestis Faklaris
- Montpellier Ressources Imagerie, Biocampus, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Leslie Bancel-Vallée
- Montpellier Ressources Imagerie, Biocampus, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Aurélien Dauphin
- Unite Genetique et Biologie du Développement U934, PICT-IBiSA, Institut Curie, INSERM, CNRS, PSL Research University, Paris, France
| | - Baptiste Monterroso
- Prism, Institut de Biologie Valrose, CNRS UMR 7277, INSERM 1091, University of Nice Sophia Antipolis - Parc Valrose, Nice, France
| | - Perrine Frère
- Plate-forme d'Imagerie de Tenon, UMR_S 1155, Hôpital Tenon, Paris, France
| | - David Geny
- Institut de Psychiatrie Et Neurosciences de Paris, INSERM U1266, Paris, France
| | - Tudor Manoliu
- Gustave Roussy, Université Paris-Saclay, Plate-forme Imagerie et Cytométrie, UMS AMMICa. Villejuif, France
| | - Sylvain de Rossi
- Montpellier Ressources Imagerie, Biocampus, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Fabrice P Cordelières
- University of Bordeaux, CNRS, INSERM, Bordeaux Imaging Center, UMS 3420, US 4, Bordeaux, France
| | - Damien Schapman
- Université of Rouen Normandie, INSERM, Plate-Forme de Recherche en Imagerie Cellulaire de Normandie, Rouen, France
| | - Roland Nitschke
- Life Imaging Center and Signalling Research Centres CIBSS and BIOSS, University Freiburg, Freiburg, Germany
| | - Julien Cau
- Montpellier Ressources Imagerie, Biocampus, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Thomas Guilbert
- Institut Cochin, INSERM (U1016), CNRS (UMR 8104), Universite de Paris (UMR-S1016), Paris, France
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3
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Pulin M, Stockhausen KE, Masseck OA, Kubitschke M, Busse B, Wiegert JS, Oertner TG. Orthogonally-polarized excitation for improved two-photon and second-harmonic-generation microscopy, applied to neurotransmitter imaging with GPCR-based sensors. BIOMEDICAL OPTICS EXPRESS 2022; 13:777-790. [PMID: 35284188 PMCID: PMC8884218 DOI: 10.1364/boe.448760] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/06/2022] [Accepted: 01/06/2022] [Indexed: 06/14/2023]
Abstract
Fluorescent proteins are excited by light that is polarized parallel to the dipole axis of the chromophore. In two-photon microscopy, polarized light is used for excitation. Here we reveal surprisingly strong polarization sensitivity in a class of genetically encoded, GPCR-based neurotransmitter sensors. In tubular structures such as dendrites, this effect led to a complete loss of membrane signal in dendrites running parallel to the polarization direction of the excitation beam. To reduce the sensitivity to dendritic orientation, we designed an optical device that generates interleaved pulse trains of orthogonal polarization. The passive device, which we inserted in the beam path of an existing two-photon microscope, removed the strong direction bias from fluorescence and second-harmonic (SHG) images. We conclude that for optical measurements of transmitter concentration with GPCR-based sensors, orthogonally polarized excitation is essential.
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Affiliation(s)
- Mauro Pulin
- Institute for Synaptic Physiology, ZMNH, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
- Research Group Synaptic Wiring and Information Processing, ZMNH, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Kilian E. Stockhausen
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, 22529 Hamburg, Germany
| | - Olivia A. Masseck
- Synthetic Biology, University of Bremen, Leobener Str. 5, 28359 Bremen, Germany
| | - Martin Kubitschke
- Synthetic Biology, University of Bremen, Leobener Str. 5, 28359 Bremen, Germany
| | - Björn Busse
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, 22529 Hamburg, Germany
- Interdisciplinary Competence Center for Interface Research (ICCIR), University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - J. Simon Wiegert
- Research Group Synaptic Wiring and Information Processing, ZMNH, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Thomas G. Oertner
- Institute for Synaptic Physiology, ZMNH, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
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4
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de Vito G, Ricci P, Turrini L, Gavryusev V, Müllenbroich C, Tiso N, Vanzi F, Silvestri L, Pavone FS. Effects of excitation light polarization on fluorescence emission in two-photon light-sheet microscopy. BIOMEDICAL OPTICS EXPRESS 2020; 11:4651-4665. [PMID: 32923069 PMCID: PMC7449752 DOI: 10.1364/boe.396388] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/20/2020] [Accepted: 07/07/2020] [Indexed: 05/05/2023]
Abstract
Light-sheet microscopy (LSM) is a powerful imaging technique that uses a planar illumination oriented orthogonally to the detection axis. Two-photon (2P) LSM is a variant of LSM that exploits the 2P absorption effect for sample excitation. The light polarization state plays a significant, and often overlooked, role in 2P absorption processes. The scope of this work is to test whether using different polarization states for excitation light can affect the detected signal levels in 2P LSM imaging of typical biological samples with a spatially unordered dye population. Supported by a theoretical model, we compared the fluorescence signals obtained using different polarization states with various fluorophores (fluorescein, EGFP and GCaMP6s) and different samples (liquid solution and fixed or living zebrafish larvae). In all conditions, in agreement with our theoretical expectations, linear polarization oriented parallel to the detection plane provided the largest signal levels, while perpendicularly-oriented polarization gave low fluorescence signal with the biological samples, but a large signal for the fluorescein solution. Finally, circular polarization generally provided lower signal levels. These results highlight the importance of controlling the light polarization state in 2P LSM of biological samples. Furthermore, this characterization represents a useful guide to choose the best light polarization state when maximization of signal levels is needed, e.g. in high-speed 2P LSM.
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Affiliation(s)
- Giuseppe de Vito
- University of Florence, Department of Neuroscience, Psychology, Drug Research and Child Health, Viale Pieraccini 6, Florence, FI 50139, Italy
- European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
| | - Pietro Ricci
- European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
| | - Lapo Turrini
- European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
- University of Florence, Department of Physics and Astronomy, Via Sansone 1, Sesto Fiorentino, FI 50019, Italy
| | - Vladislav Gavryusev
- European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
- University of Florence, Department of Physics and Astronomy, Via Sansone 1, Sesto Fiorentino, FI 50019, Italy
| | - Caroline Müllenbroich
- European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
- School of Physics and Astronomy, Kelvin Building, University of Glasgow, Glasgow, G12 8QQ, UK
- National Institute of Optics, National Research Council, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
| | - Natascia Tiso
- University of Padova, Department of Biology, Via Ugo Bassi 58/B, Padua, PD 35131, Italy
| | - Francesco Vanzi
- European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
- University of Florence, Department of Biology, Via Madonna del Piano 6, Sesto Fiorentino, FI 50019, Italy
| | - Ludovico Silvestri
- European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
- University of Florence, Department of Physics and Astronomy, Via Sansone 1, Sesto Fiorentino, FI 50019, Italy
- National Institute of Optics, National Research Council, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
| | - Francesco Saverio Pavone
- European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
- University of Florence, Department of Physics and Astronomy, Via Sansone 1, Sesto Fiorentino, FI 50019, Italy
- National Institute of Optics, National Research Council, Via Nello Carrara 1, Sesto Fiorentino, FI 50019, Italy
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Axo-myelinic neurotransmission: a novel mode of cell signalling in the central nervous system. Nat Rev Neurosci 2017; 19:49-58. [PMID: 29118449 DOI: 10.1038/nrn.2017.128] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
It is widely recognized that myelination of axons greatly enhances the speed of signal transmission. An exciting new finding is the dynamic communication between axons and their myelin-forming oligodendrocytes, including activity-dependent signalling from axon to myelin. The oligodendrocyte-myelin complex may in turn respond by providing metabolic support or alter subtle myelin properties to modulate action potential propagation. In this Opinion, we discuss what is known regarding the molecular physiology of this novel, synapse-like communication and speculate on potential roles in disease states including multiple sclerosis, schizophrenia and Alzheimer disease. An emerging appreciation of the contribution of white-matter perturbations to neurological dysfunction identifies the axo-myelinic synapse as a potential novel therapeutic target.
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