CELLULES PRÉPARATION <ol><li> Amener HUVEC et des fibroblastes en M199/10% de FBS / Pen-Strep (1:100) 1-2 jours avant perles. </li><li> Interrupteur à moyen et à EGM-2 (Clonetics) la veille pour le perlage HUVEC et le jour avant l&#39;intégration des fibroblastes. </li><li> Une concentration de ~ 400 billes par HUVEC est nécessaire. </li><li> 20000 fibroblastes par puits est nécessaire. </li></ol> REVÊTEMENT les billes avec HUVEC - Jour -1 <ol><li> Trypsiniser HUVEC. </li><li> Autoriser perles de régler (Ne pas centrifuger!). Aspirer le surnageant et laver les perles brièvement dans 1 ml d&#39;eau tiède EGM-2 moyennes. </li><li> Mix 2500 perles w / 1X10 6 HUVEC dans 1,5 ml d&#39;eau tiède EGM-2 moyennes dans un tube FACS. Placez-le verticalement dans l&#39;incubateur. (Ce sera suffisant pour ~ 10 puits. Intensifier si nécessaire) </li><li> Incuber pendant 4 heures à 37 ° C, en agitant le tube toutes les 20 min. (Bon revêtement est cruciale pour la germination.) </li><li> Après 4 heures, transférer l&#39;billes revêtues d&#39;un flacon de 5 ml de T25 dans EGM-2 et laissez O / N. </li></ol> INCORPORER billes revêtues en fibrine GEL - JOUR 0 <ol><li> Préparer la solution de fibrinogène 2,0 mg / ml (voir la section recette). </li><li> Ajouter 0,15 unités / ml d&#39;aprotinine pour la solution de fibrinogène. </li><li> Transfert des billes revêtues d&#39;un tube conique de 15 ml et laisser s&#39;installer des perles. Remettre en suspension dans 1ml perles d&#39;EGM-2 et le transfert d&#39;un tube à centrifuger de 1,5 ml. </li><li> Laver les billes 3X avec 1mL d&#39;EGM-2 par pipetage et lentement. </li><li> Nombre des perles sur une lamelle et remettre en suspension dans une solution de fibrinogène à une concentration de ~ 500 billes / mL. </li><li> Ajouter 0.625 unités / ml de thrombine à chaque puits. </li><li> Ajouter 0,5 mL de la suspension du fibrinogène / bille dans chaque puits d&#39;une plaque de 24 puits. Changer l&#39;embout de pipette pour chaque puits! </li><li> Mélanger la thrombine et le fibrinogène en allant de haut en bas doucement avec la pipette ~ 4 à 5 fois. Soyez prudent de ne pas faire de grosses bulles. </li><li> Laisser la plaque pendant 5 min dans la hotte, puis le placer dans le 37 ° C-incubateur pendant 10-15 min pour générer un caillot. </li><li> En attendant que le caillot, trypsiniser fibroblastes. </li><li> Ajouter 1 mL d&#39;EGM-2 par puits goutte à goutte. </li><li> Fibroblastes semences sur le dessus du gel de fibrine à une concentration de 20 000 cellules par puits. </li></ol> NOTES: Habituellement, lorsque le gel de fibrine est formé, vous pourrez voir de minuscules bulles dans le gel. Ne vous inquiétez pas, ils vont disparaître en 3-4 jours. Changer les médias tous les autres jours, c&#39;est à dire, Jour 2, 4, 6, etc .. En 3 ou 4 jours, vous devriez commencer à voir germer.

<ol>
	<li>Nehls, V., Drenckhahn, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+microcarrier-based+cocultivation+system+for+the+investigation+of+factors+and+cells+involved+in+angiogenesis+in+three-dimensional+fibrin+matrices+in+vitro.">A microcarrier-based cocultivation system for the investigation of factors and cells involved in angiogenesis in three-dimensional fibrin matrices in vitro.</a> Histochem Cell Biol. 104, 459-466 (1995).</li><li>Nehls, V., Drenckhahn, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+novel,+microcarrier-based+in+vitro+assay+for+rapid+and+reliable+quantification+of+three-dimensional+cell+migration+and+angiogenesis.">A novel, microcarrier-based in vitro assay for rapid and reliable quantification of three-dimensional cell migration and angiogenesis.</a> Microvasc Res. 50, 311-322 (1995).</li></ol>

Il ya un consensus croissant selon lequel trois dimensions (3D) dans les essais angiogenèse in vitro offrent un modèle qui est beaucoup plus proche de l&#39;environnement réel in vivo que peut être réalisé en utilisant des cultures 2D. Il est évident que la supériorité des systèmes 3D doit être reproductible et être capable d&#39;imiter plusieurs des grandes étapes de l&#39;angiogenèse. Bien que plusieurs dosages précédents 3D ont été développés, beaucoup de ces soit utiliser difficiles à obtenir des cellules microvascu...

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		<div>
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		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
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<tr>
<td>Cytodex-3 Beads</td>
<td>Reagent</td>
<td>Amersham Pharmacia</td>
<td>17-0485-01</td>
<td>10 g/bottle. 
1.	0.5 g of dry beads are hydrated and swollen in 50 mL PBS (pH=7.4) for at least 3 hours at RT.
Use a 50 mL tube and place it on the rocker.
2.	Let the beads settle down (~ 15 min). Discard the supernatant and wash the beads for a few minutes in fresh PBS (50 mL).
3.	Discard the PBS and replace with fresh PBS:
25 mL -> 20 mg/mL => 60000 beads/mL or
50 mL -> 10 mg/mL => 30000 beads/ mL
4.	Place the bead suspension in a siliconized glass bottle (Windshield Wiper or Sigmacote).
5.	Sterilize the beads by autoclaving for 15 min at 115&#xF0B0;C.
6.	Store it at 4&#xF0B0;C.
</td>
</tr>
<tr>
<td>Aprotinin</td>
<td>Reagent</td>
<td>Sigma</td>
<td>A-1153</td>
<td>10mg/bottle. Reconstitute lyophilized aprotinin at 4 U/mL in DI water. Sterile filter. Make aliquots of 1 mL each. Store at -20C.
</td>
</tr>
<tr>
<td>Fibrinogen Type I</td>
<td>Reagent</td>
<td>Sigma</td>
<td>F-8630</td>
<td>1g. Dissolve 2 mg/mL fibrinogen in DPBS
Note clottable protein % and adjust accordingly 
Heat in a 37&#xF0B0;C-water bath to dissolve the fibrinogen. Mix by inverting the tube. Do not vortex.
Sterile filter through 0.22 um
</td>
</tr>
<tr>
<td>Thrombin</td>
<td>Reagent</td>
<td>Sigma</td>
<td>T-3399</td>
<td>22 mg=1000 units. Reconstitute in sterile water at 50 U/mL. Make aliquots of 0.5 mL each. Store at -20C.
</td>
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optimized fibrin gel bead assay for the study of angiogenesis

L&#39;angiogenèse est un complexe multi-étapes, où, en réponse aux stimuli angiogéniques, les nouveaux navires sont créés à partir de la vascularisation existante. Ces étapes comprennent: la dégradation de la membrane basale, la prolifération et la migration (germination) des cellules endothéliales (CE) dans la matrice extracellulaire, l&#39;alignement de la CE en cordons, de branchement, la formation de lumière, anastomose, et la formation d&#39;une nouvelle membrane basale. Beaucoup d&#39;essais in vitro ont été développées pour étudier ce processus, mais la plupart ne reproduisent certaines étapes de l&#39;angiogenèse, et morphologiquement les vaisseaux dans les dosages ne sont souvent pas ressembler à des navires in vivo. Basé sur des travaux antérieurs et Nehls Drenckhahn, nous avons optimisé un dosage de l&#39;angiogenèse in vitro qui utilise la veine ombilicale humaine CE et les fibroblastes. Ce modèle reprend toutes les étapes clés au début de l&#39;angiogenèse et, surtout, les vaisseaux d&#39;affichage des brevets lumens intercellulaire entouré par polarisée CE. CE sont enduites sur microporteurs Cytodex et intégrés dans un gel de fibrine. Les fibroblastes sont en couches sur le dessus du gel, où ils assurent nécessaires facteurs solubles qui favorisent la germination CE de la surface des billes. Après plusieurs jours, de nombreux navires sont actuellement qui peut facilement être observée sous contraste de phase et de la microscopie time-lapse. Cette vidéo montre les étapes clés à mettre en place ces cultures.

Watch this Scientific Journal Video about Optimized Fibrin Gel Bead Assay for the Study of Angiogenesis at JoVE.com

Optimized Fibrin Gel Bead Assay for the Study of Angiogenesis

Cette vidéo montre le protocole d&#39;un essai angiogenèse in vitro que les stades récapitule plusieurs de l&#39;angiogenèse. Time-lapse images de la germination, la formation de lumière, la ramification et anastomose - caractéristiques essentielles de l&#39;angiogenèse - sont présentés.

Optimisé fibrine billes de gel d&#39;analyse pour l&#39;étude de l&#39;angiogenèse

Angiogenesis is a complex multi-step process, where, in response to angiogenic stimuli, new vessels are created from the existing vasculature.  These ...

optimized-fibrin-gel-bead-assay-for-the-study-of-angiogenesis

Research

JoVE Journal

Biology

31.4K vues.  University of California, Irvine (UCI). Cette vidéo montre le protocole d'un essai angiogenèse in vitro que les stades récapitule plusieurs de l'angiogenèse. Time-lapse images de la germination, la formation de lumière, la ramification et anastomose - caractéristiques essentielles de l'angiogenèse - sont présentés.

Vidéo: Optimized Fibrin Gel Bead Assay for the Study of Angiogenesis

Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards

Testing visual sensitivity in any species provides basic information regarding behaviour, evolution, and ecology. However, testing specific features of the visual system provide more empirical evidence for functional applications. Investigation into the sensory system provides information about the sensory capacity, learning and memory ability, and establishes known baseline behaviour in which to gauge deviations (Burghardt, 1977). However, unlike mammalian or avian systems, testing for learning and memory in a reptile species is difficult. Furthermore, using an operant paradigm as a psychophysical measure of sensory ability is likewise as difficult. Historically, reptilian species have responded poorly to conditioning trials because of issues related to motivation, physiology, metabolism, and basic biological characteristics. Here, I demonstrate an operant paradigm used a novel model lizard species, the Jacky dragon (Amphibolurus muricatus) and describe how to test peripheral sensitivity to salient speed and motion characteristics. This method uses an innovative approach to assessing learning and sensory capacity in lizards. I employ the use of random-dot kinematograms (RDKs) to measure sensitivity to speed, and manipulate the level of signal strength by changing the proportion of dots moving in a coherent direction. RDKs do not represent a biologically meaningful stimulus, engages the visual system, and is a classic psychophysical tool used to measure sensitivity in humans and other animals. Here, RDKs are displayed to lizards using three video playback systems. Lizards are to select the direction (left or right) in which they perceive dots to be moving. Selection of the appropriate direction is reinforced by biologically important prey stimuli, simulated by computer-animated invertebrates.

Testing visual sensitivity in lizards using an operant conditioning paradigm that employs video playback of random-dot kinematograms and computer-generated invertebrates.

Test sensibilité visuelle à la vitesse et la direction du mouvement chez les lézards

Testing visual sensitivity in any species provides basic information regarding behaviour, evolution, and ecology. However, testing specific features of ...

Recherche

Biologie

Christopher Hughes:  An in vitro model for the Study of Angiogenesis (Interview)

Christopher C.W. Hughes describes the utility of his culture system for studying angiogenesis in vitro.  He explains the importance of fibroblasts that secrete a critical, yet unidentified, soluble factor that allow endothelial cells to form vessels in culture that branch, form proper lumens, and undergo anastamosis.

Christopher Hughes:  An in vitro model for the Study of Angiogenesis Interview

Christopher C.W. Hughes describes the utility of his culture system for studying angiogenesis in vitro. He explains the importance of fibroblasts that secrete a critical, yet unidentified, soluble factor that allow endothelial cells to form vessels in culture that branch, form proper lumens, and undergo anastamosis.

Christopher Hughes: un modèle in vitro pour l&#39;étude de l&#39;angiogenèse (Interview)

Christopher C.W. Hughes describes the utility of his culture system for studying angiogenesis in vitro.  He explains the importance of fibroblasts that ...

Computer-Generated Animal Model Stimuli

Communication between animals is diverse and complex. Animals may communicate using auditory, seismic, chemosensory, electrical, or visual signals. In particular, understanding the constraints on visual signal design for communication has been of great interest. Traditional methods for investigating animal interactions have used basic observational techniques, staged encounters, or physical manipulation of morphology. Less intrusive methods have tried to simulate conspecifics using crude playback tools, such as mirrors, still images, or models. As technology has become more advanced, video playback has emerged as another tool in which to examine visual communication (Rosenthal, 2000). However, to move one step further, the application of computer-animation now allows researchers to specifically isolate critical components necessary to elicit social responses from conspecifics, and manipulate these features to control interactions. Here, I provide detail on how to create an animation using the Jacky dragon as a model, but this process may be adaptable for other species. In building the animation, I elected to use Lightwave  3D to alter object morphology, add texture, install bones, and provide comparable weight shading that prevents exaggerated movement. The animation is then matched to select motor patterns to replicate critical movement features. Finally, the sequence must rendered into an individual clip for presentation. Although there are other adaptable techniques, this particular method had been demonstrated to be effective in eliciting both conspicuous and social responses in staged interactions.

Computer-generated stimuli using the Jacky dragon as a model.

Computer-Generated Stimuli modèle animal

Communication between animals is diverse and complex. Animals may communicate using auditory, seismic, chemosensory, electrical, or visual signals. In ...

Isolation and Purification of Drosophila Peripheral Neurons by Magnetic Bead Sorting

The Drosophila peripheral nervous system (PNS) is a powerful model for investigating the complex processes of neuronal development and dendrite morphogenesis at the functional and molecular levels. To aid in these analyses, we have developed a strategy for the isolation of a subclass of PNS neurons called dendritic arborization (da) neurons that have been widely used for studying dendrite morphogenesis1,2. These neurons are very difficult to isolate as a pure population, due in part to their extremely low occurrence and their difficult-to-reach location below the tough chitinous larval cuticle. Our newly developed method overcomes these challenges, and is based on a fast and specific cell enrichment using antibody-coated magnetic beads. For our magnetic bead sorting studies, we have used age-matched third instar larvae expressing a mouse CD8 tagged GFP fusion protein (UAS-mCD8-GFP)3 under the control of either the class IV dendritic arborization (da) neuron-specific pickpocket (ppk)-GAL4 driver4 or the control of the pan-da neuron-specific GAL421-7 driver5. Although this protocol has been optimized for isolating PNS cells which are attached to the inner wall of the larval cuticle, by varying a few parameters, the same protocol could be used to isolate many different cell types attached to the cuticle at larval or pupal stages of development (e.g. epithelia, muscle, oenocytes etc.), or other cell types from larval organs depending upon the GAL4-specific driver expression pattern. The RNA isolated by this method is of high quality and can be readily used for downstream genomic analyses such as microarray gene expression profiling studies. This approach offers a powerful new tool to perform studies on isolated Drosophila dendritic arborization (da) neurons thereby providing novel insights into the molecular mechanisms underlying dendrite morphogenesis.

Isolation and Purification of Drosophila Peripheral Neurons by Magnetic Bead Sorting

In this video-article we present a method for the isolation and purification of Drosophila peripheral neurons using a fast magnetic bead assisted cell sorting strategy. RNA obtained from the isolated cells can be readily used for downstream applications including microarray analyses.

Isolement et purification de Drosophile Neurones périphériques en triant bille magnétique

The Drosophila peripheral nervous system (PNS) is a powerful model for investigating the complex processes of neuronal development and dendrite ...

Rat Mesentery Angiogenesis Assay

The adult rat mesentery window angiogenesis assay is biologically appropriate and is exceptionally well suited to the 
study of sprouting angiogenesis in vivo [see review papers], which is the dominating form of angiogenesis in human tumors and non-tumor 
tissues, as discussed in invited review papers1,2. Angiogenesis induced in the membranous mesenteric parts by intraperitoneal (i.p.) injection of a pro-angiogenic factor can be modulated
by subcutaneous (s.c.), intravenous (i.v.) or oral (p.o.) treatment with modifying agents of choice. Each membranous part of the mesentery is 
translucent and framed by fatty tissue, giving it a window-like appearance.
The assay has the following advantageous features: (i) the test tissue is natively vascularized, albeit 
sparsely, and since it is extremely thin, the microvessel network is virtually two-dimensional, which allows the entire network 
to be assessed microscopically in situ; (ii) in adult rats the test tissue lacks significant physiologic angiogenesis, which characterizes
 most normal adult mammalian tissues; the degree of native vascularization is, however, correlated with age, as discussed in1; 
(iii) the negligible level of trauma-induced angiogenesis ensures high sensitivity; (iv) the 
assay replicates the clinical situation, as the angiogenesis-modulating test drugs are administered systemically and the responses 
observed reflect the net effect of all the metabolic, cellular, and molecular alterations induced by the treatment; (v) the assay 
allows assessments of objective, quantitative, unbiased variables of microvascular spatial extension, density, and network pattern 
formation, as well as of capillary sprouting, thereby enabling robust statistical analyses of the dose-effect and molecular 
structure-activity relationships; and (vi) the assay reveals with high sensitivity the toxic or harmful effects of treatments in 
terms of decreased rate of physiologic body-weight gain, as adult rats grow robustly.
Mast-cell-mediated angiogenesis was first demonstrated using this assay3,4. The model demonstrates a high level of 
discrimination regarding dosage-effect relationships and the measured effects of systemically administered chemically or functionally closely related drugs and proteins, 
including: (i) low-dosage, metronomically administered standard chemotherapeutics that yield diverse, drug-specific effects (i.e., 
angiogenesis-suppressive, neutral or angiogenesis-stimulating activities5); (ii) natural iron-unsaturated human lactoferrin, which stimulates 
VEGF-A-mediated angiogenesis6, and natural iron-unsaturated bovine lactoferrin, which inhibits VEGF-A-mediated angiogenesis7; and (iii) 
low-molecular-weight heparin fractions produced by various means8,9. Moreover, the assay is highly suited to studies of the combined 
effects on angiogenesis of agents that are administered systemically in a concurrent or sequential fashion.
The idea of making this video originated from the late Dr. Judah Folkman when he visited our laboratory and witnessed the methodology being demonstrated.
Review papers (invited) discussing and appraising the assay
Norrby, K. In vivo models of angiogenesis. J. Cell. Mol. Med. 10, 588-612 (2006).
Norrby, K. Drug testing with angiogenesis models. Expert Opin. Drug. Discov. 3, 533-549 (2008).

Normal adult vascularized mammalian tissue that lacks physiologic angiogenesis and that has not been exposed to surgical intervention is used to study: (i) the initiation and development of angiogenesis following intraperitoneal administration of test agents; and (ii) modification of angiogenesis following systemic administration of selected test agents.

Assay Rat angiogenèse Mésentère

The adult rat mesentery window angiogenesis assay is biologically appropriate and is exceptionally well suited to the 
study of sprouting angiogenesis in ...

Endothelial Cell Tube Formation Assay for the In Vitro Study of Angiogenesis

Angiogenesis is a vital process for normal tissue development and wound healing, but is also associated with a variety of pathological conditions. Using this protocol, angiogenesis may be measured in vitro in a fast, quantifiable manner. Primary or immortalized endothelial cells are mixed with conditioned media and plated on basement membrane matrix. The endothelial cells form capillary like structures in response to angiogenic signals found in conditioned media. The tube formation occurs quickly with endothelial cells beginning to align themselves within 1&#160;hr and lumen-containing tubules beginning to appear within 2 hr. Tubes can be visualized using a phase contrast inverted microscope, or the cells can be treated with calcein AM prior to the assay and tubes visualized through fluorescence or confocal microscopy. The number of branch sites/nodes, loops/meshes, or number or length of tubes formed can be easily quantified as a measure of in vitro angiogenesis. In summary, this assay can be used to identify genes and pathways that are involved in the promotion or inhibition of angiogenesis in a rapid, reproducible, and quantitative manner.

Endothelial Cell Tube Formation Assay for the In Vitro Study of Angiogenesis

The tube formation assay is a fast, quantifiable method for measuring in vitro angiogenesis. Endothelial cells are combined with conditioned media and plated on basement membrane extract. Tube formation occurs within hours and newly formed tubules easily quantified.

Des cellules endothéliales Tube Formation test pour la<em&gt; In Vitro</em&gt; Etude de l&#39;angiogenèse

Angiogenesis is a vital process for normal tissue development and wound healing, but is also associated with a variety of pathological conditions. Using ...

A Simple Bioassay for the Evaluation of Vascular Endothelial Growth Factors

The analysis of receptor tyrosine kinases and their interacting ligands involved in vascular biology is often challenging due to the constitutive expression of families of related receptors, a broad range of related ligands and the difficulty of dealing with primary cultures of specialized endothelial cells. Here we describe a bioassay for the detection of ligands to the vascular endothelial growth factor receptor-2 (VEGFR-2), a key transducer of signals that promote angiogenesis and lymphangiogenesis. A cDNA encoding a fusion of the extracellular (ligand-binding) region of VEGFR-2 with the transmembrane and cytoplasmic regions of the erythropoietin receptor (EpoR) is expressed in the factor-dependent cell line Ba/F3. This cell line grows in the presence of interleukin-3 (IL-3) and withdrawal of this factor results in death of the cells within 24 hr. Expression of the VEGFR-2/EpoR receptor fusion provides an alternative mechanism to promote survival and potentially proliferation of stably transfected Ba/F3 cells in the presence of a ligand capable of binding and cross-linking the extracellular portion of the fusion protein (i.e., one that can cross-link the VEGFR-2 extracellular region). The assay can be performed in two ways: a semi-quantitative approach in which small volumes of ligand and cells permit a rapid result in 24 hr, and a quantitative approach involving surrogate markers of a viable cell number. The assay is relatively easy to perform, is highly responsive to known VEGFR-2 ligands and can accommodate extracellular inhibitors of VEGFR-2 signaling such as monoclonal antibodies to the receptor or ligands, and soluble ligand traps.

We describe a simple cell-based bioassay for detecting, quantifying and monitoring the activity of members of the vascular endothelial growth factor family of ligands. The assay uses chimeric receptors expressed in a factor-dependent cell line to provide a semi-quantitative or quantitative assessment of receptor binding and cross-linking by the ligand.

Un bioessai simple pour l&#39;évaluation des facteurs de croissance endothélial vasculaire

The analysis of receptor tyrosine kinases and their interacting ligands involved in vascular biology is often challenging due to the constitutive ...

In Vivo Study of Human Endothelial-Pericyte Interaction Using the Matrix Gel Plug Assay in Mouse

Angiogenesis is the process by which new blood vessels are formed from existing vessels. New vessel growth requires coordinated endothelial cell proliferation, migration, and alignment to form tubular structures followed by recruitment of pericytes to provide mural support and facilitate vessel maturation. Current in vitro cell culture approaches cannot fully reproduce the complex biological environment where endothelial cells and pericytes interact to produce functional vessels. We present a novel application of the in vivo matrix gel plug assay to study endothelial-pericyte interactions and formation of functional blood vessels using severe combined immune deficiency mutation (SCID) mice. Briefly, matrix gel is mixed with a solution containing endothelial cells with or without pericytes followed by injection into the back of anesthetized SCID mice. After 14 days, the matrix gel plugs are removed, fixed and sectioned for histological analysis. The length, number, size and extent of pericyte coverage of mature vessels (defined by the presence of red blood cells in the lumen) can be quantified and compared between experimental groups using commercial statistical platforms. Beyond its use as an angiogenesis assay, this matrix gel plug assay can be used to conduct genetic studies and as a platform for drug discovery. In conclusion, this protocol will allow researchers to complement available in vitro assays for the study of endothelial-pericyte interactions and their relevance to either systemic or pulmonary angiogenesis.

In Vivo Study of Human Endothelial-Pericyte Interaction Using the Matrix Gel Plug Assay in Mouse

We present a protocol to study human endothelial-pericyte interactions in mouse using a variation of the matrix gel plug angiogenesis assay.

Etude in vivo de Human Interaction Endothelial-péricytes Utilisation du Gel Matrice Plug - test chez la souris

Angiogenesis is the process by which new blood vessels are formed from existing vessels. New vessel growth requires coordinated endothelial cell ...

An Ex Vivo Choroid Sprouting Assay of Ocular Microvascular Angiogenesis

Pathological choroidal angiogenesis, a salient feature of age-related macular degeneration, leads to vision impairment and blindness. Endothelial cell (EC) proliferation assays using human retinal microvascular endothelial cells (HRMECs) or isolated primary retinal ECs are widely used in vitro models to study retinal angiogenesis. However, isolating pure murine retinal endothelial cells is technically challenging and retinal ECs may have different proliferation responses than choroidal endothelial cells and different cell/cell interactions. A highly reproducible ex vivo choroidal sprouting assay as a model of choroidal microvascular proliferation was developed. This model includes the interaction between choroid vasculature (EC, macrophages, pericytes) and retinal pigment epithelium (RPE). Mouse RPE/choroid/scleral explants are isolated and incubated in growth-factor-reduced basal membrane extract (BME) (day 0). Medium is changed every other day and choroid sprouting is quantified at day 6. The images of individual choroid explant are taken with an inverted phase microscope and the sprouting area is quantified using a semi-automated macro plug-in to the ImageJ software developed in this lab. This reproducible ex vivo choroidal sprouting assay can be used to assess compounds for potential treatment and for microvascular disease research to assess pathways involved in choroidal micro vessel proliferation using wild type and genetically modified mouse tissue.

This protocol presents choroid sprouting assay, an ex vivo model of microvascular proliferation. This assay can be used to assess pathways involved in proliferating choroidal micro vessels and assess drug treatments using wild type and genetically modified mouse tissue.

Un ex Vivo Choroid Sprouting Assay de l’angiogenèse microvasculaire oculaire

Pathological choroidal angiogenesis, a salient feature of age-related macular degeneration, leads to vision impairment and blindness. Endothelial cell ...

Simplification des études d’angiogenèse avec un dosage à matrice modifiée

Modified In Vivo Matrix Gel Plug Assay for Angiogenesis Studies

Several models have been developed to investigate angiogenesis in vivo. However, most of these models are complex and expensive, require specialized equipment, or are hard to perform for subsequent quantitative analysis. Here we present a modified matrix gel plug assay to evaluate angiogenesis in vivo. In this protocol, vascular cells were mixed with matrix gel in the presence or absence of pro-angiogenic or anti-angiogenic reagents, and then subcutaneously injected into the back of recipient mice. After 7 days, phosphate buffer saline containing dextran-FITC is injected via the tail vein and circulated in vessels for 30 min. Matrix gel plugs are collected and embedded with tissue embedding gel, then 12 &#181;m sections are cut for fluorescence detection without staining. In this assay, dextran-FITC with high molecular weight (~150,000 Da) can be used to indicate functional vessels for detecting their length, while dextran-FITC with low molecular weight (~4,400 Da) can be used to indicate the permeability of neo-vessels. In conclusion, this protocol can provide a reliable and convenient method for the quantitative study of angiogenesis in vivo.

Pleins feux sur l’auteur : Étude de l’angiogenèse et de la perméabilité des vaisseaux à l’aide d’un dosage du bouchon de gel matriciel modifié

The method presented here can evaluate the effect of reagents on angiogenesis or vascular permeability in vivo without staining. The method uses dextran-FITC injection via the tail vein to visualize neo-vessels or vascular leakage.

Essai de bouchon de gel matriciel in vivo modifié pour les études d’angiogenèse

Several models have been developed to investigate angiogenesis in vivo. However, most of these models are complex and expensive, require specialized ...