Nous remercions Matt Paul et Jimmy Wu pour l&#39;assistance technique.

Le transfert adoptif Injecter nouveau-nés avec 50 100 ul de la moelle osseuse à l&#39;aide d&#39;une seringue d&#39;insuline 2-4 fois durant les 3-7 premiers jours de vie, avec une finale donateurs-to-host ratio de 1:1. But pour un site d&#39;injection sous le sternum et la cage thoracique, mais au-dessus de l&#39;intestin et l&#39;estomac. Insérez l&#39;aiguille suffisamment loin pour pénétrer le péritoine, attention à ne pas percer la membrane. Il n&#39;est pas rare pour certains de la moelle osseuse d&#39;être perdus lors de l&#39;injection. Vous pouvez réduire la perte en desserrant votre emprise sur le chiot que vous injectez de manière à permettre à la peau de l&#39;expansion et, puis, lentement retirer l&#39;aiguille. Dissection de Thymus Faire une incision dans la ligne médiane et couper ou déchirer la peau pour révéler la cage thoracique. Accrochez-vous à le sternum et couper à travers le péritoine et le diaphragme. Coupez les côtés de la cage thoracique pour révéler la cavité thoracique. Le thymus est au-dessus du cœur. Afin de préserver la structure du thymus, s&#39;accrocher à des tissus environnants comme vous disséquer le thymus. Rincer le thymus avec du PBS pour l&#39;empêcher de sécher durant la dissection. Doucement taquiner loin l&#39;excès de tissu sur la surface de la capsule du thymus et coupent les deux lobes. Préparation des tissus pour l&#39;imagerie Utilisez une colle tissulaire vétérinaires de coller le thymus pas d&#39;une lamelle carré. Utilisez un pipetteman de mettre une fraction d&#39;un microlitre de colle. Étendre la colle à la longueur et la largeur approximative du thymus. Steady le thymus contre la lamelle et le faire glisser en place. Deux-Photon Imaging Le tissu est immergé dans du DMEM sans rouge de phénol qui est perfusé avec 95% d&#39;oxygène et de dioxyde de carbone de 5% et chauffé à 37 ° C. D&#39;excitation à deux photons a été réalisée en utilisant un Spectra-Physics MaiTai laser réglé à 900nm, et de la PCP, la GFP, YFP et Texas Red émission de lumière a été séparé en utilisant un 495, 515, 560 miroirs dichroïques et recueillies à l&#39;aide de détecteurs de PMT.

<ol>
	<li>Kyewski, <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Seeding+of+thymic+microenvironments+defined+by+distinct+thymocyte-stromal+cell+interactions+is+developmentally+controlled.">Seeding of thymic microenvironments defined by distinct thymocyte-stromal cell interactions is developmentally controlled.</a> J Exp Med. 166, 520-538 (1987).</li><li>Ladi, E., Yin, X., Chtanova, T., Robey, E. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Thymic+microenvironments+for+T+cell+differentiation+and+selection.">Thymic microenvironments for T cell differentiation and selection.</a> Nat Immunol. 7, 338-343 (2006).</li><li>Witt, C. M., Raychaudhuri, S., Schaefer, B., Chakraborty, A. K., Robey, E. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Directed+Migration+of+Positively+Selected+Thymocytes+Visualized+in+Real+Time.">Directed Migration of Positively Selected Thymocytes Visualized in Real Time.</a> PLoS Biol. 3, (2005).</li></ol>

The authors have nothing to disclose.

L&#39;imagerie à deux photons dans le thymus nous permet d&#39;examiner dans la vie, les organes intacts les interactions et les migrations qui sous-tendent les épreuves de sélection dans le thymus.

in situ imaging of the mouse thymus using 2-photon microscopy

Microscopie à deux photons (TPM) nous permet de l&#39;image en profondeur dans le thymus et de documenter les événements qui sont importants pour le développement des thymocytes. Pour suivre la migration des individus dans une foule de thymocytes, nous générons des chimères néonatale où moins de un pour cent des thymocytes sont issus d&#39;un donneur qui est transgénique pour une protéine ubiquitaire expresse fluorescentes. Pour générer ces chimères hématopoïétiques partielle, les bénéficiaires néonatale sont injectés avec de la moelle osseuse entre 3-7 jours d&#39;âge. Après 4-6 semaines, la souris est sacrifiée et le thymus est soigneusement disséquée et bissected préservant l&#39;architecture du tissu qui sera imagé. Le thymus est collé sur une lamelle en préparation pour l&#39;imagerie ex vivo par TPM. Pendant l&#39;imagerie du thymus est conservé dans du DMEM sans rouge de phénol qui est perfusé avec 95% d&#39;oxygène et de dioxyde de carbone de 5% et chauffé à 37 ° C. En utilisant cette approche, nous pouvons étudier les événements requis pour la génération d&#39;un répertoire des cellules T diverses.

Watch this Scientific Journal Video about In situ Imaging of the Mouse Thymus Using 2-Photon Microscopy at JoVE.com

In situ Imaging of the Mouse Thymus Using 2-Photon Microscopy

Nous présentons, étape par étape les instructions pour la génération des chimères néonatale ainsi que la dissection et la préparation du thymus pour l&#39;imagerie ex vivo par microscopie biphotonique 2.

Dans l&#39;imagerie in situ de la souris en utilisant deux Thymus microscopie biphotonique

Two-photon Microscopy (TPM) enables us to image deep into the thymus and document the events that are important for thymocyte development.  To follow the ...

in-situ-imaging-of-the-mouse-thymus-using-2-photon-microscopy

Research

JoVE Journal

Biology

11.4K vues.  University of California, Berkeley. Nous présentons, étape par étape les instructions pour la génération des chimères néonatale ainsi que la dissection et la préparation du thymus pour l'imagerie ex vivo par microscopie biphotonique 2.

Vidéo: In situ Imaging of the Mouse Thymus Using 2-Photon Microscopy

Dissection and 2-Photon Imaging of Peripheral Lymph Nodes in Mice

Two-photon imaging has revealed an elegant choreography of motility and cellular interactions within the lymph node under basal conditions and at the initiation of an immune response 1. Here, we present methods for adoptive transfer of labeled T cells, isolation of lymph nodes, and imaging motility of CD4+ T cells in the explanted lymph node as first described in 2002 2. Two-photon imaging of immune cells requires that the cells are fluorescently labeled, either by staining with a cell tracker dye or by expressing a fluorescent protein. We demonstrate the adoptive transfer procedure of injecting cells derived from donor mice into the tail vein of a recipient animal, where they home to lymphoid organs within approximately 15-30 min. We illustrate the isolation of a lymph node and describe methods to ensure proper mounting of the excised lymph node. Other considerations such as proper oxygenation of perfused media, temperature, and laser power are discussed. Finally, we present 3D video images of naive CD4+ T cells exhibiting steady state motility at 37&deg;C.

Two-photon imaging has uncovered lymphocyte motility and cellular interactions within the lymph node under basal conditions and durring an immune response 1. Here, we demonstrate adoptive transfer of T cells, isolation of lymph nodes, and imaging motility of CD4+ T cells in the explanted lymph node.

Dissection et 2-Photon Imaging des ganglions lymphatiques périphériques chez les souris

Two-photon imaging has revealed an elegant choreography of motility and cellular interactions within the lymph node under basal conditions and at the ...

Recherche

Biologie

A Method for 2-Photon Imaging of Blood Flow in the Neocortex through a Cranial Window

The ability to image the cerebral vasculature (from large vessels to capillaries) and record blood flow dynamics in the intact brain of living rodents is a powerful technique. Using in vivo 2-photon microscopy through a cranial window it is possible to image fluorescent dyes injected intravenously. This permits one to image the cortical vasculature and also to obtain measurements of blood flow. This technique was originally developed by David Kleinfeld and Winfried Denk. The method can be used to study blood flow dynamics during or after cerebral ischemia, in neurodegenerative disorders, in brain tumors, or in normal brain physiology. For example, it has been used to study how stroke causes shifts in blood flow direction and changes in red blood cell velocity or flux in and around the infarct. Here we demonstrate how to use 2-photon microscopy to image blood flow dynamics in the neocortex of living mice using fluorescent dyes injected into the tail vein.

Cortical blood flow dynamics can be studied in vivo by imaging fluorescent dextran dyes injected into the tail vein of rodents with 2-photon microscopy. This video shows how to image blood flow dynamics in neocortex of mice through a glass-covered cranial window preparation.

Une méthode pour le 2-Photon Imaging du flux sanguin dans le néocortex travers une fenêtre crânienne

The ability to image the cerebral vasculature (from large vessels to capillaries) and record blood flow dynamics in the intact brain of living rodents is ...

In Vivo 2-Photon Calcium Imaging in Layer 2/3 of Mice

To understand network dynamics of microcircuits in the neocortex, it is essential to simultaneously record the activity of a large number of neurons . In-vivo two-photon calcium imaging is the only method that allows one to record the activity of a dense neuronal population with single-cell resolution . The method consists in implanting a cranial imaging window, injecting a fluorescent calcium indicator dye that can be taken up by large numbers of neurons and finally recording the activity of neurons with time lapse calcium imaging using an in-vivo two photon microscope. Co-injection of astrocyte-specific dyes allows one to differentiate neurons from astrocytes. The technique can be performed in mice expressing fluorescent molecules in specific subpopulations of neurons to better understand the network interactions of different groups of cells.

To understand network dynamics of microcircuits in the neocortex, it is essential to simultaneously record the activity of a large number of neurons . In-vivo two-photon calcium imaging is the only method that allows one to record the activity of a dense neuronal population with single-cell resolution .

In Vivo 2-Photon Imaging calcium dans la couche 2 / 3 de souris

To understand network dynamics of microcircuits in the neocortex, it is essential to simultaneously record the activity of a large number of neurons .  ...

Generation of Bone Marrow Derived Murine Dendritic Cells for Use in 2-photon Imaging

Several methods for the preparation of murine dendritic cells can be found in the literature. Here, we present a method that produces greater than 85% CD11c high dendritic cells in culture that home to the draining lymph node after subcutaneous injection and present antigen to antigen specific T cells (see video). Additionally, we use Essen Instruments Incucyte to track dendritic cell maturation, where, at day 10, the morphology of the cultured cells is typical of a mature dendritic cell and &lt;85% of cells are CD11chigh. The study of antigen presentation in peripheral lymph nodes by 2-photon imaging revealed that there are three distinct phases of dendritic cell and T cell interaction1, 2. Phase I consists of brief serial contacts between highly motile antigen specific T cells and antigen carrying dendritic cells1, 2. Phase two is marked by prolonged contacts between antigen-specific T cell and antigen bearing dendritic cells1, 2. Finally, phase III is characterized by T cells detaching from dendritic cells, regaining motility and beginning to divide1, 2. This is one example of the type of antigen-specific interactions that can be analyzed by two-photon imaging of antigen-loaded cell tracker dye-labeled dendritic cells.

Antigen presentation in secondary lymphoid organs by dendritic cells is crucial for the initiation of the T cell mediated adaptive immune response. Here we demonstrate the culture of bone marrow derived murine dendritic cells, activation, and labeling for 2-photon imaging.

Génération de la moelle osseuse des cellules dendritiques dérivées murin pour l&#39;utilisation dans l&#39;imagerie 2-photons

Several methods for the preparation of murine dendritic cells can be found in the literature. Here, we present a method that produces greater than 85% ...

Reaggregate Thymus Cultures

Stromal cells within lymphoid tissues are organized into three-dimensional structures that provide a scaffold that is thought to control the migration and development of haemopoeitic cells. Importantly, the maintenance of this three-dimensional organization appears to be critical for normal stromal cell function, with two-dimensional monolayer cultures often being shown to be capable of supporting only individual fragments of lymphoid tissue function. In the thymus, complex networks of cortical and medullary epithelial cells act as a framework that controls the recruitment, proliferation, differentiation and survival of lymphoid progenitors as they undergo the multi-stage process of intrathymic T-cell development. Understanding the functional role of individual stromal compartments in the thymus is essential in determining how the thymus imposes self/non-self discrimination. Here we describe a technique in which we exploit the plasticity of fetal tissues to re-associate into intact three-dimensional structures in vitro, following their enzymatic disaggregation. The dissociation of fetal thymus lobes into heterogeneous cellular mixtures, followed by their separation into individual cellular components, is then combined with the in vitro re-association of these desired cell types into three-dimensional reaggregate structures at defined ratios, thereby providing an opportunity to investigate particular aspects of T-cell development under defined cellular conditions. (This article is based on work first reported Methods in Molecular Biology 2007, Vol. 380 pages 185-196).

In this video the preparation of 2-dGuo-treated reaggregate thymus cultures is demonstrated.

Réagréger cultures Thymus

Stromal cells within lymphoid tissues are organized into three-dimensional structures that provide a scaffold that is thought to control the migration and ...

In vivo Imaging and Therapeutic Treatments in an Orthotopic Mouse Model of Ovarian Cancer

Human cancer and response to therapy is better represented in orthotopic animal models. This paper describes the development of an orthotopic mouse model of ovarian cancer, treatment of cancer via oral delivery of drugs, and monitoring of tumor cell behavior in response to drug treatment in real time using in vivo imaging system. In this orthotopic model, ovarian tumor cells expressing luciferase are applied topically by injecting them directly into the mouse bursa where each ovary is enclosed. Upon injection of D-luciferin, a substrate of firefly luciferase, luciferase-expressing cells generate bioluminescence signals. This signal is detected by the in vivo imaging system and allows for a non-invasive means of monitoring tumor growth, distribution, and regression in individual animals. Drug administration via oral gavage allows for a maximum dosing volume of 10 mL/kg body weight to be delivered directly to the stomach and closely resembles delivery of drugs in clinical treatments. Therefore, techniques described here, development of an orthotopic mouse model of ovarian cancer, oral delivery of drugs, and in vivo imaging, are useful for better understanding of human ovarian cancer and treatment and will improve targeting this disease.

In vivo Imaging and Therapeutic Treatments in an Orthotopic Mouse Model of Ovarian Cancer

Orthotopic animal models of ovarian cancer replicate better human disease and therefore enhance our understanding of cancer progression and tumor response to therapy. A mouse model receives an intrabursal injection of luciferase-expressing ovarian tumor cells. Treatment is administered via oral gavage. Tumor growth is monitored by in vivo imaging system.

L&#39;imagerie in vivo et des traitements thérapeutiques dans un modèle de souris orthotopique de cancer des ovaires

Human cancer and response to therapy is better represented in orthotopic animal models.  This paper describes the development of an orthotopic mouse model ...

Visualization and Analysis of mRNA Molecules Using Fluorescence In Situ Hybridization in Saccharomyces cerevisiae

The Fluorescence in situ Hybridization (FISH) method allows one to detect nucleic acids in the native cellular environment. Here we provide a protocol for using FISH to quantify the number of mRNAs in single yeast cells. Cells can be grown in any condition of interest and then fixed and made permeable. Subsequently, multiple single-stranded deoxyoligonucleotides conjugated to fluorescent dyes are used to label and visualize mRNAs. Diffraction-limited fluorescence from single mRNA molecules is quantified using a spot-detection algorithm to identify and count the number of mRNAs per cell. While the more standard quantification methods of northern blots, RT-PCR and gene expression microarrays provide information on average mRNAs in the bulk population, FISH facilitates both the counting and localization of these mRNAs in single cells at single-molecule resolution.

Visualization and Analysis of mRNA Molecules Using Fluorescence In Situ Hybridization in Saccharomyces cerevisiae

This protocol describes an experimental procedure for performing Fluorescence in situ Hybridization (FISH) for counting mRNAs in single cells at single-molecule resolution.

Visualisation et d&#39;analyse de molécules d&#39;ARNm par fluorescence<em&gt; In Situ</em&gt; Hybridation dans<em&gt; Saccharomyces cerevisiae</em

The Fluorescence in situ Hybridization (FISH) method allows one to detect nucleic acids in the native cellular environment. Here we provide a protocol for ...

In Vivo 4-Dimensional Tracking of Hematopoietic Stem and Progenitor Cells in Adult Mouse Calvarial Bone Marrow

Through a delicate balance between quiescence and proliferation, self renewal and production of differentiated progeny, hematopoietic stem cells (HSCs) maintain the turnover of all mature blood cell lineages. The coordination of the complex signals leading to specific HSC fates relies upon the interaction between HSCs and the intricate bone marrow microenvironment, which is still poorly understood[1-2].
We describe how by combining a newly developed specimen holder for stable animal positioning with multi-step confocal and two-photon in vivo imaging techniques, it is possible to obtain high-resolution 3D stacks containing HSPCs and their surrounding niches and to monitor them over time through multi-point time-lapse imaging. High definition imaging allows detecting ex vivo labeled hematopoietic stem and progenitor cells (HSPCs) residing within the bone marrow. Moreover, multi-point time-lapse 3D imaging, obtained with faster acquisition settings, provides accurate information about HSPC movement and the reciprocal interactions between HSPCs and stroma cells.
Tracking of HSPCs in relation to GFP positive osteoblastic cells is shown as an exemplary application of this method. This technique can be utilized to track any appropriately labeled hematopoietic or stromal cell of interest within the mouse calvarium bone marrow space.

In Vivo 4-Dimensional Tracking of Hematopoietic Stem and Progenitor Cells in Adult Mouse Calvarial Bone Marrow

The nature of the interactions between hematopoietic stem and progenitor cells (HSPCs) and bone marrow niches is poorly understood. Custom hardware modifications and a multi-step acquisition protocol allow the use of two-photon and confocal microscopy to image ex vivo labeled HSPCs homed within bone marrow areas, tracking interactions and movement.

In Vivo suivi 4-Dimensional de hématopoïétiques cellules souches et progénitrices adultes dans la voûte du crâne de souris de moelle osseuse

Through a delicate balance between quiescence and proliferation, self renewal and production of differentiated progeny, hematopoietic stem cells (HSCs) ...

Detection and Analysis of DNA Damage in Mouse Skeletal Muscle In Situ Using the TUNEL Method

Terminal deoxynucleotidyl transferase (TdT) deoxyuridine triphosphate (dUTP) nick end labeling (TUNEL) is the method of using the TdT enzyme to covalently attach a tagged form of dUTP to 3&#8217; ends of double- and single-stranded DNA breaks in cells. It is a reliable and useful method to detect DNA damage and cell death in situ. This video describes dissection, tissue processing, sectioning, and fluorescence-based TUNEL labeling of mouse skeletal muscle. It also describes a method of semi-automated TUNEL signal quantitation. Inherent normal tissue features and tissue processing conditions affect the ability of the TdT enzyme to efficiently label DNA. Tissue processing may also add undesirable autofluorescence that will interfere with TUNEL signal detection. Therefore, it is important to empirically determine tissue processing and TUNEL labeling methods that will yield the optimal signal-to-noise ratio for subsequent quantitation. The fluorescence-based assay described here provides a way to exclude autofluorescent signal by digital channel subtraction. The TUNEL assay, used with appropriate tissue processing techniques and controls, is a relatively fast, reproducible, quantitative method for detecting apoptosis in tissue. It can be used to confirm DNA damage and apoptosis as pathological mechanisms, to identify affected cell types, and to assess the efficacy of therapeutic treatments in vivo.

Detection and Analysis of DNA Damage in Mouse Skeletal Muscle In Situ Using the TUNEL Method

This video describes dissection, tissue processing, sectioning, and fluorescence-based TUNEL labeling of mouse skeletal muscle. It also describes a method for semi-automated analysis of TUNEL labeling.

Détection et analyse de l&#39;ADN dommages souris muscle squelettique<em&gt; In Situ</em&gt; Utilisation de la méthode TUNEL

Terminal deoxynucleotidyl transferase (TdT) deoxyuridine triphosphate (dUTP) nick end labeling (TUNEL) is the method of using the TdT enzyme to covalently ...

Measuring the Stiffness of Ex Vivo Mouse Aortas Using Atomic Force Microscopy

Arterial stiffening is a significant risk factor and biomarker for cardiovascular disease and a hallmark of aging. Atomic force microscopy (AFM) is a versatile analytical tool for characterizing viscoelastic mechanical properties for a variety of materials ranging from hard (plastic, glass, metal, etc.) surfaces to cells on any substrate. It has been widely used to measure the stiffness of cells, but less frequently used to measure the stiffness of aortas. In this paper, we will describe the procedures for using AFM in contact mode to measure the ex vivo elastic modulus of unloaded mouse arteries. We describe our procedure for isolation of mouse aortas, and then provide detailed information for the AFM analysis. This includes step-by-step instructions for alignment of the laser beam, calibration of the spring constant and deflection sensitivity of the AFM probe, and acquisition of force curves. We also provide a detailed protocol for data analysis of the force curves.

Measuring the Stiffness of Ex Vivo Mouse Aortas Using Atomic Force Microscopy

We present detailed protocols for isolation of aortas from mouse and measurement of their elastic modulus using atomic force microscopy.

Mesure de la rigidité de<em&gt; Ex Vivo</em&gt; Souris aortes Utiliser Atomic Force Microscopy

Arterial stiffening is a significant risk factor and biomarker for cardiovascular disease and a hallmark of aging. Atomic force microscopy (AFM) is a ...