Ce travail a été financé en partie par les Instituts nationaux de subventions à la santé HL-085887, HL-092992, S10RR027535, et MOP-93676.

1. Dissection du navire et de l&#39;imagerie <ol><li> tissu de récolte de porcs domestiques mineurs comme décrit dans Martens et al 27. Placez ventricules droit porc récoltés dans un polydiméthylsiloxane (PDMS) plat de dissection fond contenant HEPES solution saline tamponnée physiologique (PSS). <ol><li> A l&#39;aide d&#39;un stéréomicroscope, disséquer et enlever une partie de la descendante antérieure gauche Artère coronaire (~ de longueur 8 mm, diamètre 0,5 mm) dans les tissus adjacents à l&#39;aide des pinces et des ciseaux à ressort en enlevant le segment de vaisseau à partir des couches de tissu cardiaque environnantes. REMARQUE: Prenez soin de ne pas percer la paroi du vaisseau. </li><li> Placez un bloc de PDMS (1 x 0,5 x 0,5 cm) dans le plat de dissection, et utiliser une aiguille à la broche au fond. Couper un fil de tungstène d&#39;environ 40 um de diamètre en douze segments ~ 0,3 cm de longueur, formant micropointes, et placez-les dans le plat. En utilisant des pinces, fixer une extrémité du segment de vaisseau de la séquence ayant une Micropin. </li><li> Insérez délicatement petits ciseaux à ressort dans la lumière du vaisseau, et couper longitudinalement sur un côté du navire pour l&#39;ouvrir complètement. Orientez le segment de vaisseau ouvert avec l&#39;endothélium haut. </li><li> Utilisez les micropointes restant à sécuriser les frontières du segment de vaisseau ouvert pour bloquer telle que le navire constitue un rectangle plat. NOTE: les dessus de Micropin doivent être pliés à 90 ° et jusqu&#39;à insérés en affleurement avec la surface du bloc. Il faut prendre soin d&#39;étirer la préparation du navire sans surexploiter; largeur finale devrait être ~ 1,5 x la largeur non étirée de départ. </li><li> Préparer un petit volume (environ 1 ml) de Fluo-4 solution AM de chargement par le mélange Fluo-4 AM (10 uM) dissoute dans du DMSO avec Pluronic (0,03%) dans un tampon HEPES tamponné PSS (contenant en mM: 134 NaCl, 6 KCl , une MgCl, 10 HEPES, 10 glucose), et insérer le bloc entier dans la solution de charge pendant environ 40 min à température ambiante dans l&#39;obscurité. </li><li> Après le chargement, laver le bloc dans tamponnée HEPESPSS pendant 5-10 min. </li><li> Monter le bloc sur 50-100 um entretoises d&#39;épaisseur dans une chambre inférieure lamelle contenant tamponnée HEPES PSS. NOTE: les repères de métal peuvent être utilisées comme entretoises et assurent le segment de vaisseau est orientée vers le bas et ne se touchant pas les éléments d&#39;espacement. </li><li> Placer la chambre sur la platine d&#39;un microscope inversé équipé pour l&#39;imagerie confocale, et se concentrer sur la couche de cellules endothéliales. </li><li> image laps de temps de capture des séquences de fluorescence relative de base pour ~ 3 min à un grossissement de 20x et un taux de ~ 8 images par seconde en utilisant le logiciel séquence d&#39;aquisition d&#39;image confocale de cadre. </li><li> Après ~ 3 min d&#39;enregistrement fluorescence basale, remplacer une solution tamponnée HEPES PSS avec le même volume (~ 1 ml) de substance P (100 pM) dissous dans tamponnée HEPES PSS, et record pour une addtional 3 min. </li></ol></li></ol> 2. Analyse automatique <ol><li> Rendre séquence (s) de l&#39;image de l&#39;activité du calcium fluorescent à partir du logiciel d&#39;acquisition en tant que confocal à 8 bits, grayscale fichiers «. tif&quot; format avec aucune information à grande échelle. </li><li> Ouvrir ImageJ, cliquez sur &#39;Ouvrir&#39; dans le menu Fichier, puis sélectionnez la séquence d&#39;image approprié dans la fenêtre de l&#39;explorateur pour voir la séquence (s) de l&#39;image dans ImageJ. </li><li> Déterminer un diamètre approprié de la ROI à l&#39;aide de l&#39;outil de ROI rectangulaire pour estimer des limites supérieure et inférieure de la propagation spatiale de l&#39;activité à l&#39;intérieur de la séquence (s) d&#39;image. REMARQUE: Le diamètre moyen rectangulaire est un choix approprié pour un diamètre de ROI. </li><li> Créez un nouveau dossier sur le disque dur de l&#39;ordinateur, et ajouter la séquence (s) de l&#39;image dans le répertoire du dossier. </li><li> Dans ImageJ, cliquez sur la fenêtre &#39;plugins, puis cliquez sur «LC_Pro&#39; pour lancer l&#39;analyse. </li><li> Entrez la valeur de retour sur investissement de diamètre et sélectionner la valeur de seuil de filtration (soit 0,05 ou 0,01). </li><li> Cliquez sur la case «traitement de la toxicomanie» et entrez les valeurs des points de temps immédiatement avant et après la drogue a été ajouté (en secondes). </li><li> Cliquez sur «OK», etentrer dans le répertoire de séquences d&#39;images dans la fenêtre explorateur de fichiers. </li></ol> 3. Sortie graphique <ol><li> Télécharger la version 3.0.2 de R <a href="http://www.r-project.org/">http://www.r-project.org/</a> . </li><li> Ouvrez la version 32 bits de R. </li><li> Cliquez sur &quot;Fichier&quot;, puis &quot;scénario ouvert» et sélectionnez le script &#39;traceplot.R&#39; R pour générer des rapports graphiques expérimentales. </li><li> Installez le calibrage, et des paquets de gplots en sélectionnant «paquets», «installer des paquets», et en sélectionnant les paquets justificative utile. </li><li> Cliquez sur «Fichier», puis «répertoire de changement» de commande, et utiliser la fenêtre de l&#39;explorateur pour sélectionner le répertoire qui correspond à la sortie de l&#39;analyse LC_Pro. </li><li> Cliquez sur la fenêtre de script, puis le &#39;exécuter tous »commande pour exécuter le script. </li></ol>

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Les auteurs n&#39;ont rien à révéler.

Décodage Ca 2 + signaux complexes au niveau cellulaire et multicellulaire nécessitera des approches expérimentales et analytiques rigoureux. Ici, une approche est décrite dans laquelle résolus séquences d&#39;images confocale de Ca 2 + fluorescence dépendante sont soumis à une analyse automatisée qui identifie et quantifie Ca 2 + signaux statistiquement pertinentes dans les domaines cellulaires intactes Dans le cas spécifique présentés, un segment d&#39;artère a été isolé...

Ca 2 + est un second messager ubiquitaire molécule de signalisation et de Ca 2 + cytosolique niveaux sont très réglementés. Ca 2 + intracellulaire signaux sont complexes et comprennent transitoires isolés, oscillations, et la propagation d&#39;ondes 1 - 4. Contrôle spatial et temporel de Ca 2 + est pensé à la base physiologique spécificité du signal, et donc l&#39;analyse de Ca 2 + modèles de signaux est d&#39;un intérêt considérable pour les chercheurs dans de multiples domaines 5. Colorants Ca 2 + d&#39;indicateurs tels que le Fluo-4 et Fura-2 sont couramment utilisés pour mesurer Ca 2 + signaux intracellulaires avec la microscopie à fluorescence 5-12. Typiquement, Ca 2 + signaux temporels sont évalués comme des changements en fonction du temps de fluorescence moyenne dans une zone définie par l&#39;utilisateur, ou de la région d&#39;intérêt (ROI) 5,6,13 - 16. Actuellement, l&#39;analyse manuelle de ROI est à la fois beaucoup de temps et de travail danstensive, car il oblige les utilisateurs à identifier de nombreux ROI et effectuer des calculs répétitifs 17-19. Ces techniques peuvent également faire l&#39;objet d&#39;une erreur d&#39;utilisation considérable, y compris l&#39;introduction de modes de signaux artificiels et l&#39;exclusion de faible amplitude ou signaux diffus 18,20. Des algorithmes de détection de ROI automatisés ont déjà été mises en œuvre en utilisant une variété de méthodes statistiques pour déterminer le placement de ROI optimal, mais ils ont généralement été limitée à l&#39;analyse de balayage de ligne ou pseudo-ligne des images numérisées, ce qui limite l&#39;analyse à une seule dimension spatiale dans le temps 17, 19-22. En outre, de nombreux algorithmes existants ne sont pas suffisants pour couvrir la diversité de Ca 2 + des événements de relâchement qui vont de périodiques, transitoires localisées à des ondes se propageant 23,24. Évaluation complète de Ca 2 + signaux physiologiques est souvent compliquée par la présence d&#39;image significative artifLoi qui confond signal discrimination de bruit dans de nombreux systèmes expérimentaux. Auparavant, une solution de l&#39;algorithme de détection de ROI automatisé de Ca 2 + signal de détection de transitoires, mis en œuvre sous forme de plugin pour le logiciel NIH ImageJ (National Institutes of Health, Bethesda, MD), a été développé et validé 25,26. Cet algorithme, appelé LC_Pro, a été conçu pour identifier et analyser ROI englobant Ca 2 + transitoires du signal en deux dimensions laps de temps des séquences d&#39;images. Voici un protocole expérimental pratique et de démonstration représentant d&#39;une application de l&#39;algorithme dans porcine endothélium des artères coronaires est fourni, avec post-traitement supplémentaire utilisant l&#39;open source logiciel de traitement statistique R pour générer une sortie graphique utilisable.

<table border="0" cellpadding="0" cellspacing="0" width="573">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">dissection dish</td>
			<td style="width:71px;">Fisher Sci</td>
			<td style="width:119px;">#08-772-70</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">polydimethylsiloxane (PDMS)</td>
			<td style="width:71px;">Fisher Sci</td>
			<td style="width:119px;">#NC9644388</td>
			<td>elastomer kit, must be molded into dishes</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">HEPES-buffered PSS</td>
			<td style="width:71px;">Sigma</td>
			<td style="width:119px;">#H3375-250G</td>
			<td>HEPES acid</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">stereomicroscope</td>
			<td style="width:71px;">Nikon Inst.</td>
			<td style="width:119px;">#MNA42000</td>
			<td></td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:216px;">forceps</td>
			<td style="width:71px;">Fine Science Tools</td>
			<td style="width:119px;">#11223-20</td>
			<td></td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:216px;">spring scissors</td>
			<td style="width:71px;">Fine Science Tools</td>
			<td style="width:119px;">15003-08</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">tungsten wire</td>
			<td style="width:71px;">Scientific Inst Svcs</td>
			<td style="width:119px;">#406</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Fluo-4 AM</td>
			<td style="width:71px;">Life Tech.</td>
			<td style="width:119px;">#F-14201</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">pluronic F-127</td>
			<td style="width:71px;">Life Tech.</td>
			<td style="width:119px;">#P3000MP</td>
			<td></td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:216px;">metal pins</td>
			<td style="width:71px;">Fine Science Tools</td>
			<td style="width:119px;">#26002-10</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">cover-glass bottom chamber</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td>Custom designed</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">spinning disc confocal microscope</td>
			<td style="width:71px;">Perkin Elmer</td>
			<td style="width:119px;">RS-3</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">imageJ software</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td><a href="http://rsbweb.nih.gov/ij/download.html">download at: http://rsbweb.nih.gov/ij/download.html</a></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">LC_Pro plugin for imageJ</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td><a href="http://rsbweb.nih.gov/ij/plugins/lc-pro/index.html">download at: http://rsbweb.nih.gov/ij/plugins/lc-pro/index.html</a></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">R software</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td><a href="http://www.r-project.org/">download at: http://www.r-project.org/</a></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">R traceplot script</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td><a href="https://docs.google.com/file/d/0B-PSp1D9e2fjV3NIcGppUzkxdEk/edit?usp=sharing">download at: https://docs.google.com/file/d/0B-PSp1D9e2fjV3NIcGppUzkxdEk/edit?usp=sharing</a></td>
		</tr>
	</tbody>
</table>

automated analysis of dynamic ca2+ signals in image sequences

Ca 2 + intracellulaire signaux sont couramment étudiées avec des colorants fluorescents de Ca2 + de l&#39;indicateur et les techniques de microscopie. Cependant, l&#39;analyse quantitative de Ca 2 + de données d&#39;imagerie prend du temps et soumis à polarisation. Automatisés algorithmes d&#39;analyse de signal selon la région d&#39;intérêt (ROI) de détection ont été mises en œuvre pour les mesures de balayage de ligne unidimensionnelle, mais il n&#39;y a pas de courant algorithme qui intègre l&#39;identification optimisé et l&#39;analyse de ROI dans des séquences d&#39;images en deux dimensions. Voici un algorithme pour l&#39;acquisition rapide et l&#39;analyse de ROI dans des séquences d&#39;images est décrit. Il utilise des ellipses correspondent aux signaux filtrés de bruit afin de déterminer le placement de ROI optimal, et calcule Ca 2 + paramètres de signal d&#39;amplitude, la durée et la diffusion spatiale. Cet algorithme a été mis en œuvre comme un plug-in disponible gratuitement pour ImageJ (NIH) des logiciels. Avec son analyse écrites pour le open source logiciel de traitement statistique R,cette approche fournit un gazoduc à haute capacité pour l&#39;analyse statistique rapide de la production expérimentale. Les auteurs suggèrent que l&#39;utilisation de ce protocole d&#39;analyse conduira à une caractérisation plus complète et impartiale de signalisation physiologique + Ca 2.

Un algorithme personnalisé, LC_Pro, a été développé et mis en œuvre afin d&#39;effectuer une analyse automatisée de Ca 2 + dynamique sur des séquences d&#39;images confocale. Comme le montre la figure 1, l&#39;algorithme utilise des modules de traitement séquentiel que A) détecte et sites piste de dynamique Ca 2 + changer dessus statistique (p &lt;0,01) bruit, B) définir des régions d&#39;intérêt (ROI) automatiquement dans les centres de site actif, et C) calculer l&#...

Watch this Scientific Journal Video about Automated Analysis of Dynamic Ca2+ Signals in Image Sequences at JoVE.com

Automated Analysis of Dynamic Ca2+ Signals in Image Sequences

Voici une nouvelle région d&#39;intérêt protocole d&#39;analyse basée sur le tri des ellipses meilleur ajustement attribués aux régions de signal positif dans le temps à deux dimensions image laps séquences est démontrée. Cet algorithme peut permettre aux enquêteurs d&#39;analyser de manière approfondie les signaux physiologiques + Ca 2 avec entrée minimale de l&#39;utilisateur et de partialité.

Analyse automatisée de dynamique Ca<sup&gt; 2 +</sup&gt; Signaux de séquences d&#39;images

Intracellular Ca2+ signals are commonly studied with fluorescent Ca2+ indicator dyes and microscopy techniques. However, quantitative analysis of Ca2+ ...

automated-analysis-of-dynamic-ca2-signals-in-image-sequences

Research

JoVE Journal

Biology

Automated Analysis of Dynamic Ca2+ Signals in Image Sequences

17.0K vues.  University of South Alabama.  Voici une nouvelle région d'intérêt protocole d'analyse basée sur le tri des ellipses meilleur ajustement attribués aux régions de signal positif dans le temps à deux dimensions image laps séquences est démontrée. Cet algorithme peut permettre aux enquêteurs d'analyser de manière approfondie les signaux physiologiques + Ca 2 avec entrée minimale de l'utilisateur et de partialité. 

Vidéo: Automated Analysis of Dynamic Ca2+ Signals in Image Sequences

Application of Light-cured Dental Adhesive Resin for Mounting Electrodes or Microdialysis Probes in Chronic Experiments

In chronic recording experiments, self-curing dental acrylic resins have been used as a mounting base of electrodes or microdialysis-probes. Since these acrylics do not bond to the bone, screws have been used as anchors. However, in small experimental animals like finches or mouse, their craniums are very fragile and can not successfully hold the anchors. In this report, we propose a new application of light-curing dental resins for mounting base of electrodes or microdialysis probes in chronic experiments. This material allows direct bonding to the cranium. Therefore, anchor screws are not required and surgical field can be reduced considerably. Past experiences show that the bonding effect maintains more than 2 months. Conventional resin's window of time when the materials are pliable and workable is a few minutes. However, the window of working time for these dental adhesives is significantly wider and adjustable.

In this report, we propose a new application of light-curing dental resins for mounting base of electrodes or microdialysis probes in chronic experiments. This material allows direct bonding to the cranium.

Application de résine photopolymérisable adhésif dentaire pour les électrodes de montage ou des sondes de microdialyse dans les expériences chroniques

In chronic recording experiments, self-curing dental acrylic resins have been used as a mounting base of electrodes or microdialysis-probes. Since these ...

Recherche

Biologie

Semi-automated Optical Heartbeat Analysis of Small Hearts

We have developed a method for analyzing high speed optical recordings from Drosophila, zebrafish and embryonic mouse hearts (Fink, et. al., 2009). Our Semi-automatic Optical Heartbeat Analysis (SOHA) uses a novel movement detection algorithm that is able to detect cardiac movements associated with individual contractile and relaxation events. The program provides a host of physiologically relevant readouts including systolic and diastolic intervals, heart rate, as well as qualitative and quantitative measures of heartbeat arrhythmicity. The program also calculates heart diameter measurements during both diastole and systole from which fractional shortening and fractional area changes are calculated. Output is provided as a digital file compatible with most spreadsheet programs. Measurements are made for every heartbeat in a record increasing the statistical power of the output. We demonstrate each of the steps where user input is required and show the application of our methodology to the analysis of heart function in all three genetically tractable heart models.

We have developed a Semi-automated Optical Heartbeat Analysis method (SOHA) for analyzing high speed optical recordings from Drosophila, zebrafish and embryonic mouse hearts. We demonstrate the application of our methodology to the analysis of heart function in fruit fly and embryonic mouse hearts.

Analyse semi-automatisée Heartbeat optique de petits coeurs

We have developed a method for analyzing high speed optical recordings from Drosophila, zebrafish and embryonic mouse hearts (Fink, et. al., 2009). Our ...

Mosaic Zebrafish Transgenesis for Evaluating Enhancer Sequences

The completion of the human genome sequence, along with that of many other species, has highlighted the challenge of ascribing specific function to non coding sequences. One prominent function carried out by the non coding fraction of the genome is to regulate gene transcription; however, there are no effective methods to broadly predict cis-regulatory elements from primary DNA sequence. We have developed an efficient protocol to functionally evaluate potential cis-regulatory elements through zebrafish transgenesis. Our approach offers significant advantages over cell-culture based techniques for developmentally important genes, since it provides information on spatial and temporal gene regulation. Conversely, it is faster and less expensive than similar experiments in transgenic mice, and we routinely apply it to sequences isolated from the human genome. Here we demonstrate our approach to selecting elements for testing based on sequence conservation and our protocol for cloning sequences and microinjecting them into zebrafish embryos.

We demonstrate our approach to finding potential enhancer elements from developmentally regulated genes and evaluating their function through mosaic zebrafish transgenesis.

La transgénèse Zebrafish Mosaic pour évaluer des séquences Enhancer

The completion of the human genome sequence, along with that of many other species, has highlighted the challenge of ascribing specific function to non ...

Robotics and Dynamic Image Analysis for Studies of Gene Expression in Plant Tissues

Gene expression in plant tissues is typically studied by destructive extraction of compounds from plant tissues for in vitro analyses. The methods presented here utilize the green fluorescent protein (gfp) gene for continual monitoring of gene expression in the same pieces of tissues, over time. The gfp gene was placed under regulatory control of different promoters and introduced into lima bean cotyledonary tissues via particle bombardment. Cotyledons were then placed on a robotic image collection system, which consisted of a fluorescence dissecting microscope with a digital camera and a 2-dimensional robotics platform custom-designed to allow secure attachment of culture dishes. Images were collected from cotyledonary tissues every hour for 100 hours to generate expression profiles for each promoter. Each collected series of 100 images was first subjected to manual image alignment using ImageReady to make certain that GFP-expressing foci were consistently retained within selected fields of analysis. Specific regions of the series measuring 300 x 400 pixels, were then selected for further analysis to provide GFP Intensity measurements using ImageJ software. Batch images were separated into the red, green and blue channels and GFP-expressing areas were identified using the threshold feature of ImageJ. After subtracting the background fluorescence (subtraction of gray values of non-expressing pixels from every pixel) in the respective red and green channels, GFP intensity was calculated by multiplying the mean grayscale value per pixel by the total number of GFP-expressing pixels in each channel, and then adding those values for both the red and green channels. GFP Intensity values were collected for all 100 time points to yield expression profiles. Variations in GFP expression profiles resulted from differences in factors such as promoter strength, presence of a silencing suppressor, or nature of the promoter. In addition to quantification of GFP intensity, the image series were also used to generate time-lapse animations using ImageReady. Time-lapse animations revealed that the clear majority of cells displayed a relatively rapid increase in GFP expression, followed by a slow decline. Some cells occasionally displayed a sudden loss of fluorescence, which may be associated with rapid cell death. Apparent transport of GFP across the membrane and cell wall to adjacent cells was also observed. Time lapse animations provided additional information that could not otherwise be obtained using GFP Intensity profiles or single time point image collections.

We report a method for introduction, tracking and quantitative analysis of GFP expression in plant cells. This method utilizes a custom-designed robotics system for semi-continuous image collection from large numbers of samples, over time. We also demonstrate the use of ImageJ and ImageReady for analysis of image series.

Robotique et d&#39;analyse d&#39;images dynamiques pour les études d&#39;expression génique dans les tissus végétaux

Gene expression in plant tissues is typically studied by destructive extraction of compounds from plant tissues for in vitro analyses. The methods ...

Development of automated imaging and analysis for zebrafish chemical screens.

We demonstrate the application of image-based high-content screening (HCS) methodology to identify small molecules that can modulate the FGF/RAS/MAPK pathway in zebrafish embryos. The zebrafish embryo is an ideal system for in vivo high-content chemical screens. The 1-day old embryo is approximately 1mm in diameter and can be easily arrayed into 96-well plates, a standard format for high throughput screening. During the first day of development, embryos are transparent with most of the major organs present, thus enabling visualization of tissue formation during embryogenesis. The complete automation of zebrafish chemical screens is still a challenge, however, particularly in the development of automated image acquisition and analysis. We previously generated a transgenic reporter line that expresses green fluorescent protein (GFP) under the control of FGF activity and demonstrated their utility in chemical screens 1. To establish methodology for high throughput whole organism screens, we developed a system for automated imaging and analysis of zebrafish embryos at 24-48 hours post fertilization (hpf) in 96-well plates 2. In this video we highlight the procedures for arraying transgenic embryos into multiwell plates at 24hpf and the addition of a small molecule (BCI) that hyperactivates FGF signaling 3. The plates are incubated for 6 hours followed by the addition of tricaine to anesthetize larvae prior to automated imaging on a Molecular Devices ImageXpress Ultra laser scanning confocal HCS reader. Images are processed by Definiens Developer software using a Cognition Network Technology algorithm that we developed to detect and quantify expression of GFP in the heads of transgenic embryos. In this example we highlight the ability of the algorithm to measure dose-dependent effects of BCI on GFP reporter gene expression in treated embryos.

We report the development of a system for automated imaging and analysis of zebrafish transgenic embryos in multiwell plates. This demonstrates the ability to measure dose dependent effects of a small molecule, BCI, on Fibroblast Growth Factor reporter gene expression and provide technology for establishing high-throughput zebrafish chemical screens.

Développement de l&#39;imagerie automatisée et d&#39;analyse pour les écrans chimiques du poisson zèbre.

We demonstrate the application of image-based high-content screening (HCS) methodology to identify small molecules that can modulate the FGF/RAS/MAPK ...

Techniques for Imaging Ca2+ Signaling in Human Sperm

Fluorescence microscopy of cells loaded with fluorescent, Ca2+-sensitive dyes is used for measurement of spatial and temporal aspects of Ca2+ signaling in live cells. Here we describe the method used in our laboratories for loading suspensions of human sperm with Ca2+-reporting dyes and measuring the fluorescence signal during physiological stimulation. Motile cells are isolated by direct swim-up and incubated under capacitating conditions for 0-24 h, depending upon the experiment. The cell-permeant AM (acetoxy methyl ester) ester form of the Ca2+-reporting dye is then added to a cell aliquot and a period of 1 h is allowed for loading of the dye into the cytoplasm. We use visible wavelength dyes to minimize photo-damage to the cells, but this means that ratiometric recording is not possible. Advantages and disadvantages of this approach are discussed. During the loading period cells are introduced into an imaging chamber and allowed to adhere to a poly-D-lysine coated coverslip. At the end of the loading period excess dye and loose cells are removed by connection of the chamber to the perfusion apparatus. The chamber is perfused continuously, stimuli and modified salines are then added to the perfusion header. Experiments are recorded by time-lapse acquisition of fluorescence images and analyzed in detail offline, by manually drawing regions of interest. Data are normalized to pre-stimulus levels such that, for each cell (or part of a cell), a graph showing the Ca2+ response as % change in fluorescence is obtained.

Techniques for Imaging Ca2+ Signaling in Human Sperm

Stimulus-evoked [Ca2+]i signals of individual human sperm are assessed. Motile cells are loaded with Ca2+-sensitive fluorescent dye (AM-ester method) and immobilised in a perfusable chamber. Cells are imaged by time-lapse fluorescence microscopy and stimulated via the perfusing medium. Responses of single cells (or regions) are analysed offline using Excel.

Techniques d&#39;imagerie Ca 2 + Signalisation dans le sperme humain

Fluorescence microscopy of cells loaded with fluorescent, Ca2+-sensitive dyes is used for measurement of spatial and temporal aspects of Ca2+ signaling in ...

ReAsH/FlAsH Labeling and Image Analysis of Tetracysteine Sensor Proteins in Cells

Fluorescent proteins and dyes are essential tools for the study of protein trafficking, localization and function in cells. While fluorescent 
proteins such as green fluorescence protein (GFP) have been extensively used as fusion partners to proteins to track the properties of a protein of interest1, recent 
developments with smaller tags enable new functionalities of proteins to be examined in cells such as conformational change and protein-association 2, 3. One small 
tag system involves a tetracysteine motif (CCXXCC) genetically inserted into a target protein, which binds to biarsenical dyes, ReAsH (red fluorescent) and FlAsH 
(green fluorescent), with high specificity even in live cells 2. The TC/biarsenical dye system offers far less steric constraints to the host protein than 
fluorescent proteins which has enabled several new approaches to measure conformational change and protein-protein interactions 4-7. We recently developed 
a novel application of TC tags as sensors of oligomerization in cells expressing mutant huntingtin, which when mutated aggregates in neurons in Huntington 
disease 7. Huntingtin was tagged with two fluorescent dyes, one a fluorescent protein to track protein location, and the second a TC tag which only 
binds biarsenical dyes in monomers. Hence, changes in colocalization between protein and biarsenical dye reactivity enabled submicroscopic oligomer 
content to be spatially mapped within cells. Here, we describe how to label TC-tagged proteins fused to a fluorescent protein (Cherry, GFP or CFP) 
with FlAsH or ReAsH in live mammalian cells and how to quantify the two color fluorescence (Cherry/FlAsH, CFP/FlAsH or GFP/ReAsH combinations).

The biarsenical dyes FlAsH and ReAsH bind specifically to tetracysteine motifs in proteins and can selectively label proteins in live cells. Recently this labeling strategy has been used to develop sensors for different protein conformations or oligomeric states. We describe the labeling approach and methods to quantitatively analyze binding.

ReAsH / Flash d&#39;étiquetage et d&#39;analyse d&#39;images de protéines dans les cellules du capteur Tetracysteine

Fluorescent proteins and dyes are essential tools for the study of protein trafficking, localization and function in cells.  While fluorescent 
proteins ...

Measuring Spatial and Temporal Ca2+ Signals in Arabidopsis Plants

Developmental and environmental cues induce Ca2+ fluctuations in plant cells. Stimulus-specific spatial-temporal Ca2+ patterns are sensed by cellular Ca2+ binding proteins that initiate Ca2+ signaling cascades. However, we still know little about how stimulus specific Ca2+ signals are generated. The specificity of a Ca2+ signal may be attributed to the sophisticated regulation of the activities of Ca2+ channels and/or transporters in response to a given stimulus. To identify these cellular components and understand their functions, it is crucial to use systems that allow a sensitive and robust recording of Ca2+ signals at both the tissue and cellular levels. Genetically encoded Ca2+ indicators that are targeted to different cellular compartments have provided a platform for live cell confocal imaging of cellular Ca2+ signals. Here we describe instructions for the use of two Ca2+ detection systems: aequorin based FAS (film adhesive seedlings) luminescence Ca2+ imaging and case12 based live cell confocal fluorescence Ca2+ imaging. Luminescence imaging using the FAS system provides a simple, robust and sensitive detection of spatial and temporal Ca2+ signals at the tissue level, while live cell confocal imaging using Case12 provides simultaneous detection of cytosolic and nuclear Ca2+ signals at a high resolution.

Measuring Spatial and Temporal Ca2+ Signals in Arabidopsis Plants

Ca2+ signaling regulates diverse biological processes in plants. Here we present approaches for monitoring abiotic stress induced spatial and temporal Ca2+ signals in Arabidopsis cells and tissues using the genetically encoded Ca2+ indicators Aequorin or Case12.

Mesure spatiale et temporelle Ca<sup&gt; 2 +</sup&gt; Signaux de plantes d&#39;Arabidopsis

Developmental and environmental cues induce Ca2+ fluctuations in plant cells. Stimulus-specific spatial-temporal Ca2+ patterns are sensed by cellular Ca2+ ...

Imaging Local Ca2+ Signals in Cultured Mammalian Cells

Cytosolic Ca2+ ions regulate numerous aspects of cellular activity in almost all cell types, controlling processes as wide-ranging as gene transcription, electrical excitability and cell proliferation. The diversity and specificity of Ca2+ signaling derives from mechanisms by which Ca2+ signals are generated to act over different time and spatial scales, ranging from cell-wide oscillations and waves occurring over the periods of minutes to local transient Ca2+ microdomains (Ca2+ puffs) lasting milliseconds. Recent advances in electron multiplied CCD (EMCCD) cameras now allow for imaging of local Ca2+ signals with a 128 x 128 pixel spatial resolution at rates of &#62;500 frames sec-1 (fps). This approach is highly parallel and enables the simultaneous monitoring of hundreds of channels or puff sites in a single experiment. However, the vast amounts of data generated (ca. 1 Gb per min) render visual identification and analysis of local Ca2+ events impracticable. Here we describe and demonstrate the procedures for the acquisition, detection, and analysis of local IP3-mediated Ca2+ signals in intact mammalian cells loaded with Ca2+ indicators using both wide-field epi-fluorescence (WF) and total internal reflection fluorescence (TIRF) microscopy. Furthermore, we describe an algorithm developed within the open-source software environment Python that automates the identification and analysis of these local Ca2+ signals. The algorithm localizes sites of Ca2+ release with sub-pixel resolution; allows user review of data; and outputs time sequences of fluorescence ratio signals together with amplitude and kinetic data in an Excel-compatible table.

Imaging Local Ca2+ Signals in Cultured Mammalian Cells

Here we present techniques for imaging local IP3-mediated Ca2+ events using fluorescence microscopy in intact mammalian cells loaded with Ca2+ indicators together with an algorithm that automates identification and analysis of these events.

Imagerie Ca locale<sup&gt; 2+</sup&gt; Signaux de cellules de mammifères cultivées

Cytosolic Ca2+ ions regulate numerous aspects of cellular activity in almost all cell types, controlling processes as wide-ranging as gene transcription, ...

High-resolution Time-lapse Imaging and Automated Analysis of Microtubule Dynamics in Living Human Umbilical Vein Endothelial Cells

The physiological process by which new vasculature forms from existing vasculature requires specific signaling events that trigger morphological changes within individual endothelial cells (ECs). These processes are critical for homeostatic maintenance such as wound healing, and are also crucial in promoting tumor growth and metastasis. EC morphology is defined by the organization of the cytoskeleton, a tightly regulated system of actin and microtubule (MT) dynamics that is known to control EC branching, polarity and directional migration, essential components of angiogenesis. To study MT dynamics, we used high-resolution fluorescence microscopy coupled with computational image analysis of fluorescently-labeled MT plus-ends to investigate MT growth dynamics and the regulation of EC branching morphology and directional migration. Time-lapse imaging of living Human Umbilical Vein Endothelial Cells (HUVECs) was performed following transfection with fluorescently-labeled MT End Binding protein 3 (EB3) and Mitotic Centromere Associated Kinesin (MCAK)-specific cDNA constructs to evaluate effects on MT dynamics. PlusTipTracker software was used to track EB3-labeled MT plus ends in order to measure MT growth speeds and MT growth lifetimes in time-lapse images. This methodology allows for the study of MT dynamics and the identification of how localized regulation of MT dynamics within sub-cellular regions contributes to the angiogenic processes of EC branching and migration.

Protocols for Human Umbilical Vein Endothelial Cell (HUVEC) culture, transient transfection of fluorescently-labeled markers of microtubule growth, live-cell imaging and automated analysis of interphase microtubule growth dynamics are detailed.

Haute résolution Time-lapse d&#39;imagerie et d&#39;analyse automatisée des microtubules Dynamics Living ombilicale humaine Cellules endothéliales de veine

The physiological process by which new vasculature forms from existing vasculature requires specific signaling events that trigger morphological changes ...