Name: tracking cells in gfp-transgenic zebrafish using the photoconvertible psmorange system
Uploaded: 2016-02-05T15:00:00.000+00:00
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Description: Watch this Scientific Journal Video about Tracking Cells in GFP-transgenic Zebrafish Using the Photoconvertible PSmOrange System at JoVE.com

We thank O. Subach for providing the original H2B-PSmOrange plasmid and our fish facility team for fish care. We are grateful to the Nikon Imaging Center at the University of Heidelberg for access to microscopy equipment and analysis software. We acknowledge the support of the Core Facility Live Cell Imaging Mannheim at the CBTM (DFG INST 91027/10-1 FUGG). This work was supported by the Excellenzcluster CellNetworks, EcTop Spatio-temporal coordination of signaling processes (EcTop 2), University of Heidelberg to C.A.B. and the Medical Faculty Mannheim of the University Heidelberg and the DFG (FOR 1036/2, 298/3-1 and 298/6-1) to M.C.

1. H2B-PSmOrange mRNA in vitro-Transkription und mRNA Purification <ol><li> Linearisieren die H2B-PSmOrange enthält pCS2 + Plasmid, das die NotI-Restriktionsenzym unter Verwendung von nach den Anweisungen des Herstellers. Hinweis: Führen Sie die nächsten Schritte mit geeigneten Schutzmaßnahmen wie Handschuhe und Kittel mRNA Verschmutzung und Verschlechterung zu verhindern. </li><li> Reinige den linearisierten DNA einer PCR Purification Kit oder Phenol-Chloroform-basierte Verfahren nach Herstellerprotokollen. </li><li> Verwenden 1 ug linearisierte Matrizen-DNA für Sp6-mRNA-Transkription nach Herstellerangaben. </li><li> Entfernen DNA durch Zugabe von 1,0 U RNase freie DNaseI für 10-20 min bei 37 ° C. </li><li> Clean up the mRNA eine RNA bereinigen Kit gemäß dem Protokoll des Herstellers. </li><li> Zur Erhöhung der mRNA Reinheit und Konzentration, fallen die mRNA durch Zugabe von 6 ul Natriumacetat (3,0 M, pH 5,2) und 150 &amp; mgr; l 96% Ethanol. Inkubieren Sie die mixed Lösung bei -20 ° C für mindestens 30 min und bis zu 24 Stunden. </li><li> Sammeln Sie die mRNA, indem die Lösung bei 18,407 xg Zentrifugieren für 45 min bei 4 ° C. Entsorgen Sie die Flüssigkeit und resuspendieren die mRNA in 150 ul 70% Ethanol. Mischen und Zentrifugieren der Lösung für weitere 15 min bei 4 ° C. Entsorgen Sie die Flüssigkeit, trocknet das Pellet für 5 Minuten auf Eis und resuspendieren die mRNA in 20 ul ultrareinem RNase freies Wasser. </li><li> Bewerten Sie die Konzentration und Reinheit der mRNA durch photometrische Messung einer 1: 100-mRNA-Verdünnung (1 ul mRNA in 99 &amp; mgr; l ultrareinem RNase freies Wasser). </li><li> Für kurzzeitige Lagerung, halten Sie die mRNA-Lösung bei -20 ° C. Für die langfristige Lagerung, halten Sie die mRNA bei -80 ° C. </li></ol> 2. H2B-PSmOrange mRNA Mikroinjektion in Zebrafischembryonen <ol><li> Richten Sie Paare in der Nacht vor der Injektion Paarung mit tg (foxD3: GFP); tg (FLH: GFP) doppelt transgenen Fisch (oder jede andere GFP transgenen Fische). Lassen Sie den Fisch getrennt durch einen Abstandshalter platzierenzwischen ihnen die Zeit der Paarung zu steuern. </li><li> Entfernen Sie die Abstandshalter am Morgen der Einspritzung und lassen die Fische Kumpel für 20 min. </li><li> Während der Zeit der Paarung, verdünnte die H2B-PSmOrange mRNA zur endgültigen Konzentration von 130 pg / nl (in RNase freies Wasser) und Transfer 6 ul Injektionslösung in einem Mikroinjektion Kapillare eine Micro Trick. Schauen Sie sich die Einspritzmenge mit einem kalibrierten Glasträger. Stellen Sie den Einspritzdruck zu injizieren 2 nl mRNA-Lösung (260 pg). </li><li> Sammeln Sie die Eier in eine sterilisierte Kunststoffpetrischale mit 1x Embryo (E3) Medium. </li><li> Übertragen Sie 20 bis 30 Embryonen zu einem Einspritzschale mit einem Kunststoffpasteurpipette. </li><li> Injizieren 2 nl mRNA Lösung in der Zelle enthalten oder direkt unter der Zelle in das Eigelb an der Ein-Zell-Stadium 11. </li><li> Transfer injizierten Embryonen in eine Petrischale 1x E3-Medium, das Entfernen unbefruchtete oder nicht normal Embryonen und wachsen sie bei 28 ° C zu entwickeln. Hinweis: Lichtschutz of den Embryonen nicht während des ganzen Experiments erforderlich. </li><li> Heben Zebrafischembryonen in 1x E3 Medium und fügen 0,2 mM PTU (1-Phenyl-2 Thioharnstoff) nach gastrulation Pigmentierung zu hemmen. Ändern Sie das Medium zweimal pro Tag, um die Gefahr von bakteriellen Kontaminationen zu minimieren. </li></ol> 3. Embryo Einbetten <ol><li> Wählen Sie das GFP (grün) und PSmOrange (orange / rot) co-exprimierenden Embryonen ein Binokular mit einem Fluoreszenz-Lampe und angemessene Emissionsfiltern. Übertragen Sie die positiven Embryonen in eine sterile Petrischale mit 1x E3 Medium. </li><li> Dechorionate Embryonen unter einem Stereomikroskop Pinzette 12. </li><li> Transfer eines Embryos in ein 1,5 ml Röhrchen mit 1,0 ml vorgewärmten 1,0% niedrig schmelzender Agarose (LMA) in ultrareinem Wasser hergestellt, indem ein Cut-Spitze Pipette (P200) verwendet. Hinweis: Wärmen Sie die LMA bis 80 ° C und Abkühlung für 3-5 Minuten bei Raumtemperatur, bevor der Embryo Einbettung. </li><li> Übertragen Sie die Embryos in 150 ul LMA in einemKammerdeckgläser und passen Sie die Ausrichtung des Embryos, zum Beispiel Rückenseite nach unten in das Experiment für den invertierten konfokalen Laser-Scanning-Mikroskop A1R + (oder einem anderen geeigneten Mikroskop) beschrieben, eine feine Spitze aus Kunststoff verwenden. Wenn die LMA polymerisiert wird, füllen Sie die Kammer mit Fisch Wasser, das 0,2 mM PTU und 0,02% Ethyl-3-aminobenzoat Methansulfonat (Tricaine) für die Anästhesie. </li><li> Bevor die Probe Bildgebung, warten Sie 15 Minuten, um die Wirkung von Tricaine zu ermitteln. Die Anästhesie verhindert Embryo Bewegungen, die ein Stereomikroskop mit Hellfeldbeleuchtung überwacht werden kann. Anmerkung: Die Kammern zweimal wiederverwendet werden kann. </li></ol> 4. PSmOrange Photokonversion <ol><li> Legen Sie die Probe unter dem konfokalen Mikroskop und scannen die Probe um den Bereich zu identifizieren, um photoconvert mit 488 nm und 561 nm Laser zur Abbildung GFP und PSmOrange sind. Hinweis: Mit der umgekehrten konfokalen Laser-Scanning-Mikroskop A1R + auf dem umgekehrten stage TiEcontrolled durch das Mikroskop Imaging-Software und ausgestattet mit 488 nm, 561 nm und 640 nm Laser für die Photokonversion und Bildgebung. Jedoch ist die Anwendung sicher nicht auf diese beschränkt Mikroskop solange die Laserlinien zur Umwandlung und Bild verfügbar sind. <ol><li> Setzen Sie den 20X Luft Objektiv ein (NA: 0,75; WD: 1,0 mm; FOV: 0,64 x 0,64 mm). </li><li> Verwenden Sie die folgenden Einstellungen des Mikroskops die PSmOrange Protein vor Photokonversion zu erkennen: 561-nm-Laser, 0,74 mW bei der Fokusebene über dem Ziel gemessen. Hinweis: Diese auf diesem System bis zu 40% entspricht (in der Fokusebene messen, ist der einzige Weg, um die Wirkleistung zu bestimmen). Stellen Sie die Laserleistung nach experimentellen Anforderungen wie die Effizienz der H2B-PSmOrange Injektionen variieren. </li><li> In Zoomfaktoren den Bereich von Interesse zu markieren. Höhere Vergrößerungen reduzieren Bildaufnahmezeit und damit Phototoxizität. </li></ol></li><li> Erwerben Sie eine Z-Stack für den Aufbaus von Interesse unter Verwendung von 488 nm und 561 nm Laser im sequenziellen Modus (Zeilenmodus 1-&gt; 4). Befestigen Sie die z-Schritt zwischen 1,0 und 2,0 um. Rauh und Scan-Frequenz kann verwendet werden, um Bildqualität zu optimieren. </li><li> Scannen Sie die Probe und wählen Sie die Region of Interest (ROI) Werkzeug, um den Bereich zu markieren, um photoconvert. Befestigen Sie den ROI als Stimulationsbereich. Wählen Sie das Foto Aktivierung / Bleaching-Modul, aktivieren Sie die 488-nm-Laser durch das entsprechende Kontrollkästchen aktivieren und stellen Sie die 488-nm-Laser bis 80% (1 mW Laserleistung auf dem Ziel gemessen). Stellen Sie die Scan-Geschwindigkeit bis 0,5 sec / Frame. </li><li> Öffnen Sie die Photo Dienstprogramm (ND Stimulation) und die Photo Einstellungen angeben. <ol><li> Klicken Sie auf den Befehl &quot;Hinzufügen&quot; die Photo Protokoll anzugeben. </li><li> Stellen Sie &quot;Phase&quot; ein in der &quot;Erwerb / Stimulation&quot; -Menü auf &quot;Übernahme&quot; und geben Sie die Anzahl der Bilder vor Photo erworben werden in der &quot;Loops&quot; -Menü. </li><li> Stellen Sie &quot;Phase&quot; 2 auf &quot;St.imulation &quot;und die Anzahl der Stimulationsereignisse geben durchgeführt werden. </li><li> Stellen Sie &quot;Phase&quot; 3 wie für &quot;Phase&quot; 1. Optional beschrieben, legen Sie eine Warte &quot;Phase&quot; nach der &quot;Phase&quot; 2 durch die Zeit vor der letzten Runde der Bildaufnahme zu warten eingeben. </li><li> Sobald alle Parameter eingestellt werden, gelten die Stimulation Einstellung und die Photo laufen. Hinweis: Die Laserleistung, die Frequenz des Scannens und der Anzahl der Wiederholungen für jede Runde von Photo variieren und unterscheiden sich von Embryos Embryos. Eine Einstellung zu beginnen, ist in Tabelle 1 gezeigt. </li></ol></li><li> Erwerben Sie eine endgültige Z-Stapel mit 488 nm, 561 nm und 640 nm Laser, wie oben die Einstellungen zu übernehmen. Stellen Sie die 640-nm-Laser die konvertierte PSmOrange mit hoher Laserleistung (bis zu 4,5 mW) zu visualisieren. </li></ol> 5. Demontieren Embryo aus LMA <ol><li> Entfernen Sie den Embryo aus dem Mikroskop enthaltenden Kammer. Entfernen Sie vorsichtig den Embryo aus der Agarose usingen Zange. </li><li> Bringen Sie den Embryo in eine neue sterilisierte Kunststoffpetrischale oder in eine sterilisierte 6-Well-Platte mit 1x E3 und 0,2 mM PTU. Inkubieren des Embryos bei 28 ° C, bis die gewünschte Stufe der Entwicklung. </li></ol> 6. Die Analyse der Fate of photokonvertiertem PSmOrange Protein exprimierenden Zellen <ol><li> Re-einbetten den Embryo als 3.3 und 3.4 unter den Punkten beschrieben. </li><li> Legen Sie die Probe unter dem konfokalen Mikroskop und scannen die Probe zu photokonvertiertem Zellen (640 nm) in der GFP transgenen Struktur von Interesse (488 nm) zu identifizieren. </li><li> Erwerben Sie eine Z-Stapel Abdecken der Strukturen von Interesse unter Verwendung von 488 nm, 561 nm und 640 nm Laser im sequenziellen Modus (Zeilenmodus 1-&gt; 4). Befestigen Sie die z-Schritt zwischen 1,0 und 2,0 um. Rauh und Scan-Frequenz kann verwendet werden, um Bildqualität zu optimieren. </li><li> Verwenden Sie eine der folgenden Methoden, um Zellen zu identifizieren, die Co-express GFP und die photokonvertiertem Protein. <ol><li> Maß automatische Fidschi BildJ Makro 3 <ol><li> Convolve der Originalstapel die &quot;Weichzeichnen&quot; Plugin (→ Bearbeiten → Filter → Weichzeichnen) und subtrahieren die glatten Stapel von der ursprünglichen Verwendung der &quot;Bild Rechner&quot; Plugin (→ Prozess → Bildrechner) verwenden. Verwenden Sie diesen Schritt, um die Strukturen von Interesse zu visualisieren und zur Verringerung der Rechenzeit für die Analyse. </li><li> Übernehmen bestimmte Schwellenwerte zu den grünen und dunkelroten Kanäle, um die photokonvertiertem Zellen zu markieren (→ Bild → → Stellen Threshold). Verwenden Sie den &quot;Analyze Particles&quot; Werkzeug, um die Schwelle Bereiche mit einem passenden Rahmen zu erkennen (→ Analysieren → Analysieren Partikel). </li><li> Öffnen Sie die &quot;Bild Rechner&quot; Plugin und zeigen die überlappenden ROIs im grünen und dunkelroten Kanal in gelb (→ Prozess → Bildrechner). </li></ol></li><li> Microscope Imaging-Software für 3D-Datenauswertung <ol><li> Zeigen Sie den Stapel in3D die Show Volumen Ansichtsoption (→ 3D-Visualisierung Menü → Show Volume anzeigen) verwenden. Verwenden Sie die grafische Schnittstelle, um die grünen, roten und dunkelrotes Kanäle, die Helligkeit, den Kontrast und die Ernte der 3D-Stapel zu wählen Sie die photokonvertiertem Bereich (Abbildung 1) zu markieren. Hinweis: Ähnliche Verfahren werden die Daten sind in den meisten der gemeinsamen Software zur Bildanalyse zu analysieren. </li></ol></li></ol></li></ol>

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The authors have nothing to disclose.

Transgene Embryonen fluoreszierenden Reporter trägt grundlegend zu verstehen, die embryonale Entwicklung geholfen. Es besteht jedoch immer noch die wesentliche Notwendigkeit für Promotoren die spezifische Visualisierung von besonderen Strukturen zu erleichtern. In ihrer Abwesenheit, verlassen sich die Forscher auf Techniken wie die Photokonversion von fluoreszierenden Proteinen über den Ursprung und die Entwicklung ihrer Struktur von Interesse zu erfahren. Dies wiederum ist eine wesentliche Voraussetzung, die molekul...

Exponentially improving imaging techniques allow following developmental processes over time periods of up to about four consecutive days3. In zebrafish and many other animal model systems, specific cells, tissues, axonal or vascular structures are marked by transgenic green or sometimes red or yellow fluorescent proteins to facilitate visualization. However, in most transgenic lines the transgene is not specifically expressed in the cells of interest but also additional structures, which hinders the precise tracking of for instance single cells or groups of cells.
Fluorescent photoconvertible proteins are well suited for cell tracking during embryonic development. The prerequisites for the application of such proteins are a long-lived nature, a well-separated emission range upon conversion and bright fluorescence. Available photoconvertible proteins comprise those that change their emission range upon conversion such as Kaede4, KiGR5, mEos26, PS-CFP2 or Dendra27 and others which are only fluorescent when photoactivated (PAmCherry8, PAGFP9 or PATagRFP10). Their applications to track cells in existing FP-transgenic animals are however limited as they often involve a green fluorescent state or do not fulfill all of the above criteria. Only recently, Subach and colleagues reported the PSmOrange protein, which changes its emission from orange/red to far red upon photoconversion and was successfully applied in cells in culture and cultured cells injected into mice2.
To investigate the protein's suitability for cell tracking in a living embryo, we generated an expression construct for the microinjection of nuclear-tagged H2B-PSmOrange into zebrafish embryos. We find that the protein fulfills all prerequisites for successful cell tracking in GFP transgenic backgrounds during the first 4 (and possibly more) days of zebrafish embryonic development. During this time, most of the cell migratory events are completed in fish making the PSmOrange system an excellent addition to the zebrafish toolkit.

<table><tbody><tr><td>PCR Purification Kit</td><td>Qiagen</td><td>28104</td><td></td></tr><tr><td>mMESSAGE mMACHINE SP6 Transcription kit</td><td>Ambion</td><td>AM1340</td><td></td></tr><tr><td>RNeasy MiniElute Cleanup kit</td><td>Qiagen</td><td>74204</td><td></td></tr><tr><td>Plastic Pasteur</td><td>alpha laboratories</td><td>LW4000</td><td></td></tr><tr><td>Original H2B-PSmOrange Plasmid</td><td>Addgene</td><td>31920</td><td>The plasmid described in the paper is available in the Carl lab</td></tr><tr><td>FemtoJet Microinjector</td><td>Eppendorf</td><td>5247 000.013</td><td></td></tr><tr><td>Forceps (5 Inox)</td><td>NeoLab</td><td>2-1633</td><td></td></tr><tr><td>Lab-Tek II Chambered #1.5 German Coverglass System&amp;nbsp;</td><td>Nunc</td><td>155382</td><td></td></tr><tr><td>Nikon A1R+</td><td>Nikon GmbH Germany</td><td>No Number</td><td></td></tr><tr><td>Nikon PLAN Apo &amp;lambda; 20X air objective&amp;nbsp;</td><td>Nikon GmbH Germany</td><td>No Number</td><td></td></tr><tr><td>NIS Elements AR Software (v. 4.30.02)</td><td>Nikon GmbH Germany/Laboratory Imaging</td><td>No Number</td><td></td></tr></tbody></table>

tracking cells in gfp-transgenic zebrafish using the photoconvertible psmorange system

The rapid development of transparent zebrafish embryos (Danio rerio) in combination with fluorescent labelings of cells and tissues allows visualizing developmental processes as they happen in the living animal. Cells of interest can be labeled by using a tissue specific promoter to drive the expression of a fluorescent protein (FP) for the generation of transgenic lines. Using fluorescent photoconvertible proteins for this purpose additionally allows to precisely follow defined structures within the expression domain. Illuminating the protein in the region of interest, changes its emission spectrum and highlights a particular cell or cell cluster leaving other transgenic cells in their original color. A major limitation is the lack of known promoters for a large number of tissues in the zebrafish. Conversely, gene- and enhancer trap screens have generated enormous transgenic resources discretely labeling literally all embryonic structures mostly with GFP or to a lesser extend red or yellow FPs. An approach to follow defined structures in such transgenic backgrounds would be to additionally introduce a ubiquitous photoconvertible protein, which could be converted in the cell(s) of interest. However, the photoconvertible proteins available involve a green and/or less frequently a red emission state1 and can therefore often not be used to track cells in the FP-background of existing transgenic lines. To circumvent this problem, we have established the PSmOrange system for the zebrafish2,3. Simple microinjection of synthetic mRNA encoding a nuclear form of this protein labels all cell nuclei with orange/red fluorescence. Upon targeted photoconversion of the protein, it switches its emission spectrum to far red. The quantum efficiency and stability of the protein makes PSmOrange a superb cell-tracking tool for zebrafish and possibly other teleost species.

1 veranschaulicht ein Beispiel des PSmOrange Photosystem. Die Zirbeldrüse Komplex ist eine konservierte Struktur im Wirbeltier dorsalen Zwischenhirn. Wie in vielen anderen Wirbeltieren besteht dieser Komplex der Pinealorgan in der Mitte des Zwischenhirns und den linksseitigen parapineal Zellen. Elegant, aber zeitaufwendig Uncaging Experimente zeigten, dass parapineal Zellen 13 in den vorderen Teil des Pinealorgan stammen. In tg (foxD3: GFP); tg (FLH: GFP) tra...

Watch this Scientific Journal Video about Tracking Cells in GFP-transgenic Zebrafish Using the Photoconvertible PSmOrange System at JoVE.com

Tracking Cells in GFP-transgenic Zebrafish Using the Photoconvertible PSmOrange System

We established the photoconvertible PSmOrange system as a powerful, straight-forward and cost inexpensive tool for in vivo cell tracking in GFP transgenic backgrounds. This protocol describes its application in the zebrafish model system.

Tracking-Zellen in GFP-transgenen Zebrafisch Mit dem Photokonvertierbare PSmOrange-System

The rapid development of transparent zebrafish embryos (Danio rerio) in combination with fluorescent labelings of cells and tissues allows visualizing ...

tracking-cells-gfp-transgenic-zebrafish-using-photoconvertible

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Developmental Biology

8.5K Aufrufe.  Heidelberg University. We established the photoconvertible PSmOrange system as a powerful, straight-forward and cost inexpensive tool for in vivo cell tracking in GFP transgenic backgrounds. This protocol describes its application in the zebrafish model system.

Serie: Tracking Cells in GFP-transgenic Zebrafish Using the Photoconvertible PSmOrange System

Single-cell Photoconversion in Living Intact Zebrafish

Animal and plant tissue is composed of distinct populations of cells. These cells interact over time to build and maintain the tissue and can cause disease when disrupted. Scientists have developed clever techniques to investigate characteristics and natural dynamics of these cells within intact tissue by expressing fluorescent proteins in subsets of cells. However, at times, experiments require more selected visualization of cells within the tissue, sometimes at the single-cell or population-of-cells manner. To achieve this and visualize single cells within a population of cells, scientists have utilized single-cell photoconversion of fluorescent proteins. To demonstrate this technique, we show here how to direct UV light to an Eos-expressing cell of interest in an intact, living zebrafish. We then image those photoconverted Eos+ cells 24 h later to determine how they changed in the tissue. We describe two techniques: single cell photoconversion and photoconversions of populations of cell. These techniques can be used to visualize cell-cell interactions, cell-fate and differentiation, and cell migrations, making it a technique that is applicable in numerous biological questions.

Here, we present a protocol to show how cell photoconversion is achieved through UV exposure to specific areas expressing the fluorescent protein, Eos, in living animals.

Einzellige Ladungszustand im lebendigen intakten Zebrafisch

Animal and plant tissue is composed of distinct populations of cells. These cells interact over time to build and maintain the tissue and can cause ...

Forschung

Entwicklungsbiologie

Following Endocardial Tissue Movements via Cell Photoconversion in the Zebrafish Embryo

During embryogenesis, cells undergo dynamic changes in cell behavior, and deciphering the cellular logic behind these changes is a fundamental goal in the field of developmental biology. The discovery and development of photoconvertible proteins have greatly aided our understanding of these dynamic changes by providing a method to optically highlight cells and tissues. However, while photoconversion, time-lapse microscopy, and subsequent image analysis have proven to be very successful in uncovering cellular dynamics in organs such as the brain or the eye, this approach is generally not used in the developing heart due to challenges posed by the rapid movement of the heart during the cardiac cycle. This protocol consists of two parts. The first part describes a method for photoconverting and subsequently tracking endocardial cells (EdCs) during zebrafish atrioventricular canal (AVC) and atrioventricular heart valve development. The method involves temporally stopping the heart with a drug in order for accurate photoconversion to take place. Hearts are allowed to resume beating upon removal of the drug and embryonic development continues normally until the heart is stopped again for high-resolution imaging of photoconverted EdCs at a later developmental time point. The second part of the protocol describes an image analysis method to quantify the length of a photoconverted or non-photoconverted region in the AVC in young embryos by mapping the fluorescent signal from the three-dimensional structure onto a two-dimensional map. Together, the two parts of the protocol allows one to examine the origin and behavior of cells that make up the zebrafish AVC and atrioventricular heart valve, and can potentially be applied for studying mutants, morphants, or embryos that have been treated with reagents that disrupt AVC and/or valve development.

This protocol describes a method for the photoconversion of Kaede fluorescent protein in endocardial cells of the living zebrafish embryo that enables the tracking of endocardial cells during atrioventricular canal and atrioventricular heart valve development.

Folgenden endokardialen Gewebe Bewegungen über Zelle Ladungszustand des Zebrafish Embryos

During embryogenesis, cells undergo dynamic changes in cell behavior, and deciphering the cellular logic behind these changes is a fundamental goal in the ...

Two-Photon-Based Photoactivation in Live Zebrafish Embryos

Photoactivation of target compounds in a living organism has proven a valuable approach to investigate various biological processes such as embryonic development, cellular signaling and adult physiology. In this respect, the use of multi-photon microscopy enables quantitative photoactivation of a given light responsive agent in deep tissues at a single cell resolution. As zebrafish embryos are optically transparent, their development can be monitored in vivo. These traits make the zebrafish a perfect model organism for controlling the activity of a variety of chemical agents and proteins by focused light. Here we describe the use of two-photon microscopy to induce the activation of chemically caged fluorescein, which in turn allows us to follow cell's destiny in live zebrafish embryos. We use embryos expressing a live genetic landmark (GFP) to locate and precisely target any cells of interest. This procedure can be similarly used for precise light induced activation of proteins, hormones, small molecules and other caged compounds.

Multiphoton microscopy allows control of low energy photons with deep optical penetration and reduced phototoxicity. We describe the use of this technology for live cell labeling in zebrafish embryos. This protocol can be readily adapted for photo-induction of various light-responsive molecules.

Zwei-Photonen-Based Photoaktivierung in Live Zebrafischembryonen

Photoactivation of target compounds in a living organism has proven a valuable approach to investigate various biological processes such as embryonic ...

Biologie

Photoconversion of Purified Fluorescent Proteins and Dual-probe Optical Highlighting in Live Cells

Photoconvertible fluorescent proteins (pc-FPs) are a class of fluorescent proteins with "optical highlighter" capability, meaning that the color of fluorescence can be changed by exposure to light of a specific wavelength. Optical highlighting allows noninvasive marking of a subpopulation of fluorescent molecules, and is therefore ideal for tracking single cells or organelles.
Critical parameters for efficient photoconversion are the intensity and the exposure time of the photoconversion light. If the intensity is too low, photoconversion will be slow or not occur at all. On the other hand, too much intensity or too long exposure can photobleach the protein and thereby reduce the efficiency of photoconversion.
This protocol describes a general approach how to set up a confocal laser scanning microscope for pc-FP photoconversion applications. First, we describe a procedure for preparing purified protein droplet samples. This sample format is very convenient for studying the photophysical behavior of fluorescent proteins under the microscope. Second, we will use the protein droplet sample to show how to configure the microscope for photoconversion. And finally, we will show how to perform optical highlighting in live cells, including dual-probe optical highlighting with mOrange2 and Dronpa.

This protocol describes a general approach to perform photoconversion of fluorescent proteins on a confocal laser scanning microscope. We describe procedures for the photoconversion of puried protein samples, as well as for dual-probe optical highlighting in live cells with mOrange2 and Dronpa.

Photokonversion von gereinigtem fluoreszierende Proteine ​​und Dual-Sonde Optische Hervorhebung in lebenden Zellen

Photoconvertible fluorescent proteins (pc-FPs) are a class of fluorescent proteins with "optical highlighter" capability, meaning that the color of ...

Multicolor Time-lapse Imaging of Transgenic Zebrafish: Visualizing Retinal Stem Cells Activated by Targeted Neuronal Cell Ablation

High-resolution time-lapse imaging of living zebrafish larvae can be utilized to visualize how biological processes unfold (for review see 1). Compound transgenic fish which express different fluorescent reporters in neighboring cell types provide a means of following cellular interactions 2 and/or tissue-level responses to experimental manipulations over time. In this video, we demonstrate methods that can be used for imaging multiple transgenically labeled cell types serially in individual fish over time courses that can span from minutes to several days. The techniques described are applicable to any study seeking to correlate the "behavior" of neighboring cells types over time, including: 1) serial 'catch and release' methods for imaging a large number of fish over successive days, 2) simplified approaches for separating fluorophores with overlapping excitation/emission profiles (e.g., GFP and YFP), 3) use of hypopigmented mutant lines to extend the time window available for high-resolution imaging into late larval stages of development, 4) use of membrane targeted fluorescent reporters to reveal fine morphological detail of individual cells as well as cellular details in larger populations of cells, and 5) a previously described method for chemically-induced ablation of transgenically targeted cell types; i.e., nitroreductase (NTR) mediated conversion of prodrug substrates, such as metronidazole (MTZ), to cytotoxic derivatives 3,5.
As an example of these approaches, we will visualize the ablation and regeneration of a subtype of retinal bipolar neuron within individual fish over several days. Simultaneously we will monitor several other retinal cell types, including neighboring non-targeted bipolar cells and potential degeneration-stimulated retinal stem cells (i.e., M&#971;ller glia). This strategy is being applied in our lab to characterize cell- and tissue-level (e.g., stem cell niche) responses to the selective loss and regeneration of targeted neuronal cell types.

In this video, techniques for multicolor confocal time-lapse imaging and targeted cell ablation are provided. Time-lapse imaging is used to monitor the behavior of multiple cell types of interest in vivo. Targeted cell ablation facilitates the study neural circuit function and cell-specific neuronal regeneration paradigms.

Multicolor Zeitraffer-Imaging transgener Zebrafische: Visualisierung von Retinal Stammzellen durch gezielte Nervenzellen Ablation Activated

High-resolution time-lapse imaging of living zebrafish larvae can be utilized to visualize how biological processes unfold (for review see 1). Compound ...

Single Cell Fate Mapping in Zebrafish

The ability to differentially label single cells has important implications in developmental biology. For instance, determining how hematopoietic, lymphatic, and blood vessel lineages arise in developing embryos requires fate mapping and lineage tracing of undifferentiated precursor cells. Recently, photoactivatable proteins which include: Eos1, 2, PAmCherry3, Kaede4-7, pKindling8, and KikGR9, 10 have received wide interest as cell tracing probes. The fluorescence spectrum of these photosensitive proteins can be easily converted with UV excitation, allowing a population of cells to be distinguished from adjacent ones. However, the photoefficiency of the activated protein may limit long-term cell tracking11. As an alternative to photoactivatable proteins, caged fluorescein-dextran has been widely used in embryo model systems7, 12-14. Traditionally, to uncage fluorescein-dextran, UV excitation from a fluorescence lamp house or a single photon UV laser has been used; however, such sources limit the spatial resolution of photoactivation. Here we report a protocol to fate map, lineage trace, and detect single labeled cells. Single cells in embryos injected with caged fluorescein-dextran are photoactivated with near-infrared laser pulses produced from a titanium sapphire femtosecond laser. This laser is customary in all two-photon confocal microscopes such as the LSM 510 META NLO microscope used in this paper. Since biological tissue is transparent to near-infrared irradiation15, the laser pulses can be focused deep within the embryo without uncaging cells above or below the selected focal plane. Therefore, non-linear two-photon absorption is induced only at the geometric focus to uncage fluorescein-dextran in a single cell. To detect the cell containing uncaged fluorescein-dextran, we describe a simple immunohistochemistry protocol16 to rapidly visualize the activated cell. The activation and detection protocol presented in this paper is versatile and can be applied to any model system. 
Note: The reagents used in this protocol can be found in the table appended at the end of the article.

A method is described to photoactivate single cells containing a caged fluorescent protein using two-photon absorption from a Ti:Sapphire femtosecond laser oscillator. To fate map the photoactivated cell, immunohistochemistry is used. This technique can be applied to any cell type.

Single Cell Fate Mapping im Zebrafisch

The ability to differentially label single cells has important implications in developmental biology. For instance, determining how hematopoietic, ...

Cell Tracking Using Photoconvertible Proteins During Zebrafish Development

Embryogenesis is a dynamic process that is best studied by using techniques that allow the documentation of developmental changes in vivo. The use of genetically-encoded fluorescent proteins has proven a valuable strategy for elucidating dynamic morphogenetic processes as they occur in the intact organism. During the past decade, the development of photoactivatable and photoconvertible fluorescent proteins has opened the possibility to investigate the fate of discrete subpopulations of tagged proteins1. Unlike photoactivatable proteins, photoconvertible fluorescent proteins (PCFPs) are readily tracked and imaged in their native emission state prior to photoconversion, making it easier to identify and select regions by optical inspection. PCFPs, such as Kaede2, KikGR3, Dendra4 and EosFP5, can be shifted from green to red upon exposure to UV or blue light due to a His-Tyr-Gly tripeptide sequence which forms a green chromophore that can be photoconverted to a red one by a light-catalyzed &beta;-elimination and subsequent extension of a &pi;-conjugated system3. PCFPs and their monomeric variants are useful tools for tracking cells6-10 and studying protein dynamics11-14, respectively. During recent years, PCFPs have been expressed in different animal model, such as zebrafish6, chicken7,8 and mouse9,10 for cell fate tracking. Here we report a protocol for cell-specific photoconversion of PCFPs in the living zebrafish embryo and further tracking of photoconverted proteins at later developmental stages. This methodology allows studying, in a tissue-specific manner, cell biological events underlying morphogenesis in the zebrafish animal model.

Here, we present a method for the photoactivated switch of photoconvertible fluorescent proteins (PCFPs) in the living zebrafish embryo and further tracking of photoconverted protein at specific time points during development. This methodology allows monitoring of cell biological events underlying different developmental processes in a live vertebrate organism.

Handy-Tracking Mit Photoconvertible Proteine ​​während der Zebrafisch-Entwicklung

Embryogenesis is a dynamic process that is best studied by using techniques that allow the documentation of developmental changes in vivo. The use of ...

Generation of Dispersed Presomitic Mesoderm Cell Cultures for Imaging of the Zebrafish Segmentation Clock in Single Cells

Segmentation is a periodic and sequential morphogenetic process in vertebrates. This rhythmic formation of blocks of tissue called somites along the body axis is evidence of a genetic oscillator patterning the developing embryo. In zebrafish, the intracellular clock driving segmentation is comprised of members of the Her/Hes transcription factor family organized into negative feedback loops. We have recently generated transgenic fluorescent reporter lines for the cyclic gene her1 that recapitulate the spatio-temporal pattern of oscillations in the presomitic mesoderm (PSM). Using these lines, we developed an in vitro culture system that allows real-time analysis of segmentation clock oscillations within single, isolated PSM cells. By removing PSM tissue from transgenic embryos and then dispersing cells from oscillating regions onto glass-bottom dishes, we generated cultures suitable for time-lapse imaging of fluorescence signal from individual clock cells. This approach provides an experimental and conceptual framework for direct manipulation of the segmentation clock with unprecedented single-cell resolution, allowing its cell-autonomous and tissue-level properties to be distinguished and dissected.

Somitogenesis is a rhythmic developmental process that spatially patterns the body axis of vertebrate embryos. Previously, we developed transgenic zebrafish lines that use fluorescent reporters to observe the cyclic genes that drive this process. Here, we culture dispersed cells from these lines and image their oscillations over time in vitro.

Generierung von Dispersed präsomitischen Mesoderm Zellkulturen für Imaging der Zebrafisch-Segmentierung Uhr in Einzelzellen

Segmentation is a  periodic and sequential morphogenetic process in vertebrates. This rhythmic  formation of blocks of tissue called somites along the ...

ROS Live Cell Imaging During Neuronal Development

Reactive oxygen species (ROS) are well-established signaling molecules, which are important in normal development, homeostasis, and physiology. Among the different ROS, hydrogen peroxide (H2O2) is best characterized with respect to roles in cellular signaling. H2O2 has been implicated during the development in several species. For example, a transient increase in H2O2 has been detected in zebrafish embryos during the first days following fertilization. Furthermore, depleting an important cellular H2O2 source, NADPH oxidase (NOX), impairs nervous system development such as the differentiation, axonal growth, and guidance of retinal ganglion cells (RGCs) both in&#160;vivo and in vitro. Here, we describe a method for imaging intracellular H2O2 levels in cultured zebrafish neurons and whole larvae during development using the genetically encoded H2O2-specific biosensor, roGFP2-Orp1. This probe can be transiently or stably expressed in zebrafish larvae. Furthermore, the ratiometric readout diminishes the probability of detecting artifacts due to differential gene expression or volume effects. First, we demonstrate how to isolate and culture RGCs derived from zebrafish embryos that transiently express roGFP2-Orp1. Then, we use whole larvae to monitor H2O2 levels at the tissue level. The sensor has been validated by the addition of H2O2. Additionally, this methodology could be used to measure H2O2 levels in specific cell types and tissues by generating transgenic animals with tissue-specific biosensor expression. As zebrafish facilitate genetic and developmental manipulations, the approach demonstrated here could serve as a pipeline to test the role of H2O2 during neuronal and general embryonic development in vertebrates.

This protocol describes the use of a genetically encoded hydrogen peroxide (H2O2)-biosensor in cultured zebrafish neurons and larvae for assessing the physiological signaling roles of H2O2 during nervous system development. It can be applied to different cell types and modified with experimental treatments to study reactive oxygen species (ROS) in general development.

ROS Live Cell Imaging während der neuronalen Entwicklung

Reactive oxygen species (ROS) are well-established signaling molecules, which are important in normal development, homeostasis, and physiology. Among the ...

Neurowissenschaften

Protein Phase Separation Assay: An Optogenetic Method for Mutant RNA-Binding Protein Phase Separation in Spinal Motor Neurons of Zebrafish Larvae

Source: Asakawa, K. et al. <a href="https://www.jove.com/v/62932">Optogenetic Phase Transition of TDP-43 in Spinal Motor Neurons of Zebrafish Larvae.</a> J. Vis. Exp. (2022)
In this video, we describe a phase separation assay, wherein intracellular proteins comprising intrinsically disordered regions fused to a photosensitive oligomerization domain are induced via blue-light exposure to self-associate into membrane-less liquid-like condensates.

Protein-Phasentrennungs-Assay: Eine optogenetische Methode zur Mutanten-RNA-bindenden Protein-Phasentrennung in spinalen Motoneuronen von Zebrafischlarven

Source: Asakawa, K. et al. Optogenetic Phase Transition of TDP-43 in Spinal Motor Neurons of Zebrafish Larvae. J. Vis. Exp. (2022)
In this video, we ...

Tracking-Zellen in GFP-transgenen Zebrafisch Mit dem Photokonvertierbare PSmOrange-System

Zusammenfassung

Weitere Videos entdecken

Kapitel in diesem Video

Einzellige Ladungszustand im lebendigen intakten Zebrafisch

Folgenden endokardialen Gewebe Bewegungen über Zelle Ladungszustand des Zebrafish Embryos

Zwei-Photonen-Based Photoaktivierung in Live Zebrafischembryonen

Photokonversion von gereinigtem fluoreszierende Proteine und Dual-Sonde Optische Hervorhebung in lebenden Zellen

Multicolor Zeitraffer-Imaging transgener Zebrafische: Visualisierung von Retinal Stammzellen durch gezielte Nervenzellen Ablation Activated

Single Cell Fate Mapping im Zebrafisch

Handy-Tracking Mit Photoconvertible Proteine während der Zebrafisch-Entwicklung

Generierung von Dispersed präsomitischen Mesoderm Zellkulturen für Imaging der Zebrafisch-Segmentierung Uhr in Einzelzellen

ROS Live Cell Imaging während der neuronalen Entwicklung

Protein-Phasentrennungs-Assay: Eine optogenetische Methode zur Mutanten-RNA-bindenden Protein-Phasentrennung in spinalen Motoneuronen von Zebrafischlarven

Tracking-Zellen in GFP-transgenen Zebrafisch Mit dem Photokonvertierbare PSmOrange-System

Zusammenfassung

Weitere Videos entdecken

Kapitel in diesem Video

Einzellige Ladungszustand im lebendigen intakten Zebrafisch

Folgenden endokardialen Gewebe Bewegungen über Zelle Ladungszustand des Zebrafish Embryos

Zwei-Photonen-Based Photoaktivierung in Live Zebrafischembryonen

Photokonversion von gereinigtem fluoreszierende Proteine ​​und Dual-Sonde Optische Hervorhebung in lebenden Zellen

Multicolor Zeitraffer-Imaging transgener Zebrafische: Visualisierung von Retinal Stammzellen durch gezielte Nervenzellen Ablation Activated

Single Cell Fate Mapping im Zebrafisch

Handy-Tracking Mit Photoconvertible Proteine ​​während der Zebrafisch-Entwicklung

Generierung von Dispersed präsomitischen Mesoderm Zellkulturen für Imaging der Zebrafisch-Segmentierung Uhr in Einzelzellen

ROS Live Cell Imaging während der neuronalen Entwicklung

Protein-Phasentrennungs-Assay: Eine optogenetische Methode zur Mutanten-RNA-bindenden Protein-Phasentrennung in spinalen Motoneuronen von Zebrafischlarven

Photokonversion von gereinigtem fluoreszierende Proteine und Dual-Sonde Optische Hervorhebung in lebenden Zellen

Handy-Tracking Mit Photoconvertible Proteine während der Zebrafisch-Entwicklung