Cauda veia injeções de corantes fluorescentes dextranos <ol><li> De modo a vasculatura cerebral imagem, os animais devem ser injetados por via intravenosa com um corante fluorescente. Usamos dextran-conjugados corantes porque a molécula de dextran impede a tintura de atravessar a barreira hematoencefálica e vazando dos vasos sanguíneos. </li><li> Os ratos são anestesiados com isoflurano (4% para a indução, 1,5-2% durante a injeção). </li><li> Cauda é desinfetada com álcool 70%. </li><li> Com uma agulha de calibre 26, 75-100 mL de uma solução 5% v / v de rodamina dextran dissolvido em solução salina é injetada através da veia da cauda, ​​a meio caminho ao longo do eixo da cauda. </li><li> Os animais podem ser visualizados imediatamente após a injeção veia da cauda até a tintura é excretada na urina, que irá transformar-de-rosa, se utilizando um corante rodamina em cerca de 2 horas. </li></ol> Imagem do fluxo sanguíneo através de dois fótons de microscopia (duração total 30-60 min por sessão, dependendo do número de navios com imagens) <ol><li> Após a injeção de corante fluorescente dextran, o mouse é anestesiado com isoflurano (4% para a indução, 1-1,5% para geração de imagens). </li><li> Mouse está firmemente ligado usando a barra de titânio para o estágio do microscópio, que contém uma almofada de aquecimento termo-regulada para manter o animal aquecido. Alguns pomada é aplicada para manter os olhos úmidos. </li><li> A tampa de vidro da janela cranial é limpa com álcool 70%. </li><li> A janela é posicionada paralelamente ao plano focal e centrado no campo de visão no âmbito do objectivo 4X. </li><li> É melhor para tirar uma fotografia dos vasos superfície do cérebro com uma câmera digital. Esta imagem será usada como imagem de referência em seguir as sessões de imagem para encontrar a região fotografada várias vezes no dia a dia. </li><li> O objetivo 4X é substituído com o objetivo de imersão em água 40X sem se mover no palco. Uma imagem digital do campo de visão é tomada novamente. As coordenadas no manipulador estágio são fixados em zero. </li><li> Usamos scanimage como o software de aquisição de imagem. Isto foi escrito em MatLab por Tom Pologruto e Sabatini Bernardo no laboratório de Karel Svoboda (Pologruto et al., 2003). A seguir, ligue todos os outros equipamentos: o laser, o medidor de energia, os tubos foto multiplicadores, os amplificadores, etc </li><li> A área da janela adequada a ser trabalhada é brevemente digitalizadas em baixa ampliação para encontrar as melhores regiões. Uma vez que estes são identificados, uma pilha de baixa ampliação da região escolhida para a imagem é tirada, e coordena a sua XY são anotadas. </li><li> Para gravar dinâmica do fluxo de sangue nos pequenos vasos capilares ou usamos scans linha ao longo de pelo menos 40 mM do navio de interesse. Estes single &quot;varre&quot; um segundo duradoura são feitas utilizando-se como potência do laser mínimo possível e as coordenadas e ângulo de varredura são escritos para baixo. </li><li> Assim que a sessão de imagem é longo, o animal é movido a uma câmara quente, onde ele pode se recuperar da anestesia. </li></ol>

<ol>
	<li>Kleinfeld, D., Mitra, P. P., Helmchen, F., Denk, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluctuations+and+stimulus-induced+changes+in+blood+flow+observed+in+individual+capillaries+in+layers+2+through+4+of+rat+neocortex.">Fluctuations and stimulus-induced changes in blood flow observed in individual capillaries in layers 2 through 4 of rat neocortex.</a> Proc Nat Acad Sci. 95, 15741-15746 (1998).</li><li>Pologruto, T. A., Sabatini, B. L., Svoboda, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=ScanImage:+flexible+software+for+operating+laser+scanning+microscopes.">ScanImage: flexible software for operating laser scanning microscopes.</a> Biomed. Eng. Online. 17, 2-13 (2003).</li><li>Zhang, S., Murphy, T. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Imaging+the+impact+of+cortical+microcirculation+on+synaptic+structure+and+sensory-evoked+hemodynamic+responses+in+vivo.">Imaging the impact of cortical microcirculation on synaptic structure and sensory-evoked hemodynamic responses in vivo.</a> 5, (2007).</li><li>Nishimura, N., Schaffer, C. B., Friedman, B., Lyden, P. D., Kleinfeld, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Penetrating+arterioles+are+a+bottleneck+in+the+perfusion+of+neocortex.">Penetrating arterioles are a bottleneck in the perfusion of neocortex.</a> Proc Nat Acad Sci. 104, 365-370 (2007).</li></ol>

Dinâmica do fluxo sanguíneo cortical pode ser estudada in vivo por corantes fluorescentes imagem dextran injetado na veia da cauda dos roedores com dois fótons de microscopia. Este vídeo mostra um método de imagem como a dinâmica do fluxo sanguíneo no neocórtex de camundongos através de um vidro coberto de preparação janela craniana.

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a method for 2-photon imaging of blood flow in the neocortex through a cranial window

A capacidade de imagem da vasculatura cerebral (a partir de navios de grande porte para capilares) e dinâmica registro de fluxo sanguíneo no cérebro dos roedores que vivem intacta é uma técnica poderosa. In vivo utilizando dois fótons de microscopia através de uma janela cranial é possível corantes fluorescentes imagem injetada por via intravenosa. Isto permite uma imagem para a vascularização cortical e também para obter medidas de fluxo sanguíneo. Esta técnica foi desenvolvida originalmente por David Kleinfeld e Winfried Denk. O método pode ser usado para estudar a dinâmica do fluxo sanguíneo durante ou após a isquemia cerebral, em doenças neurodegenerativas, em tumores cerebrais, ou na fisiologia normal do cérebro. Por exemplo, ela tem sido usada para estudar como acidente vascular cerebral provoca mudanças na direção do fluxo do sangue e alterações na velocidade de glóbulos vermelhos ou fluxo em e ao redor do infarto. Aqui demonstramos como usar dois fótons de microscopia para a dinâmica do fluxo sanguíneo imagem no neocórtex de ratos vivos usando corantes fluorescentes injetadas na veia da cauda.

Watch this Scientific Journal Video about A Method for 2-Photon Imaging of Blood Flow in the Neocortex through a Cranial Window at JoVE.com

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

Dinâmica do fluxo sanguíneo cortical pode ser estudada in vivo por corantes fluorescentes imagem dextran injetado na veia da cauda dos roedores com 2-fótons microscopia. Este vídeo mostra como a dinâmica do fluxo sanguíneo na imagem neocórtex de ratos através de um vidro coberto de preparação janela craniana.

Um método para 2-Photon Imagens de Fluxo de Sangue no neocórtex através de uma janela Cranial

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-method-for-2-photon-imaging-blood-flow-neocortex-through-cranial

Research

JoVE Journal

Biology

18.7K visualizações.  University of California, Los Angeles. Dinâmica do fluxo sanguíneo cortical pode ser estudada in vivo por corantes fluorescentes imagem dextran injetado na veia da cauda dos roedores com 2-fótons microscopia. Este vídeo mostra como a dinâmica do fluxo sanguíneo na imagem neocórtex de ratos através de um vidro coberto de preparação janela craniana.

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

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.

Dissecção e 2-Photon Imagens de linfonodos periféricos em ratos

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

Biologia

Pyrosequencing: A Simple Method for Accurate Genotyping

Pharmacogenetic research benefits first-hand from the abundance of information provided by the completion of the Human Genome Project. With such a tremendous amount of data available comes an explosion of genotyping methods. Pyrosequencing(R) is one of the most thorough yet simple methods to date used to analyze polymorphisms. It also has the ability to identify tri-allelic, indels, short-repeat polymorphisms, along with determining allele percentages for methylation or pooled sample assessment. In addition, there is a standardized control sequence that provides internal quality control. This method has led to rapid and efficient single-nucleotide polymorphism evaluation including many clinically relevant polymorphisms. The technique and methodology of Pyrosequencing is explained.


Pyrosequencing(R) is one of the most thorough yet simple methods to date used to analyze polymorphisms. This method has led to rapid and efficient single-nucleotide polymorphism evaluation including many clinically relevant polymorphisms. The technique and methodology of Pyrosequencing is explained.

Pyrosequencing: Um método simples para genotipagem Accurate

Pharmacogenetic research benefits first-hand from the abundance of information provided by the completion of the Human Genome Project. With such a ...

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

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 migration of individuals in a crowd of thymocytes , we generate neonatal chimeras where less than one percent of the thymocytes are derived from a donor that is transgenic for a ubiquitously express fluorescent protein. To generate these partial hematopoetic chimeras, neonatal recipients are injected with bone marrow between 3-7 days of age. After 4-6 weeks, the mouse is sacrificed and the thymus is carefully dissected and bissected preserving the architecture of the tissue that will be imaged. The thymus is glued onto a coverslip in preparation for ex vivo imaging by TPM. During imaging the thymus is kept in DMEM without phenol red that is perfused with 95% oxygen and 5% carbon dioxide and warmed to 37&deg;C. Using this approach, we can study the events required for the generation of a diverse T cell repertoire.

We present step-by-step instructions for the generation of neonatal chimeras as well as the dissection and preparation of the thymus for ex vivo imaging by 2-Photon Microscopy.

Na imagem situ da Thymus Mouse Usando 2-Photon Microscopia

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 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 .

Vivo em 2-Photon Imagens de cálcio na camada 2 / 3 dos Ratos

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.

Geração de Medula Óssea Derivado Células Dendríticas murino para uso em dois fótons de imagem

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% ...

Use of Rotorod as a Method for the Qualitative Analysis of Walking in Rat

High speed videoanalysis of the details of movement can provide a source of information about qualitative aspects of walking movements. When walking on a rotorod, animals remain in approximately the same place making repetitive movements of stepping. Thus the task provides a rich source of information on the details of foot stepping movements. Subjects were hemi-Parkinson analogue rats, produced by injection of 6-hydroxydopamine (6-OHDA) into the right nigrostriatal bundle to deplete nigrostriatal dopamine (DA). The present report provides a video analysis illustration of animals previously were filmed from frontal, lateral, and posterior views as they walked (15). Rating scales and frame-by-frame replay of the video records of stepping behavior indicated that the hemi-Parkinson rats were chronically impaired in posture and limb use contralateral to the DA-depletion. The contralateral limbs participated less in initiating and sustaining propulsion than the ipsilateral limbs. These deficits secondary to unilateral DA-depletion show that the rotorod provides a use task for the analysis of stepping movements.

The rotorod test is used to assess motor status in the walking movement of hemi-Parkinson analogue rats.

Uso de Rotorod como um método de análise qualitativa de Walking in Rat

High speed videoanalysis of the details of movement can provide a source of information about qualitative aspects of walking movements. When walking on a ...

Dendra2 Photoswitching through the Mammary Imaging Window

In the last decade, intravital microscopy of breast tumors in mice and rats at single-cell resolution1-4 has resulted in important insights into mechanisms of metastatic behavior such as migration, invasion and intravasation of tumor cells5, 6, angiogenesis3 and immune cells response7-9. We have recently reported a technique to image orthotopic mammary carcinomas over multiple intravital imaging sessions in living mice10. For this, we have developed a Mammary Imaging Window (MIW) and optimized imaging parameters for Dendra211 photoswitching and imaging in vivo. Here, we describe the protocol for the manufacturing of MIW, insertion of the MIW on top of a tumor and imaging of the Dendra2- labeled tumor cells using a custom built imaging box. This protocol can be used to image the metastatic behavior of tumor cells in distinct microenvironments in tumors and allows for long term imaging of blood vessels, tumor cells and host cells.

Intravital photoswitching and tracking of Dendra2-labeled tumor cells through the Mammary Imaging Window is a technique which allows us to image the metastatic behavior of tumor cells in chosen tumor microenvironments over a timescale of days.

Dendra2 Photoswitching através da janela de imagem mamária

In the last decade, intravital microscopy of breast tumors in mice and rats at single-cell resolution1-4  has resulted in important insights into ...

A Simple Method for Imaging Arabidopsis Leaves Using Perfluorodecalin as an Infiltrative Imaging Medium

The problem of acquiring high-resolution images deep into biological samples is widely acknowledged1. In air-filled tissue such as the spongy mesophyll of plant leaves or vertebrate lungs further difficulties arise from multiple transitions in refractive index between cellular components, between cells and airspaces and between the biological tissue and the rest of the optical system. Moreover, refractive index mismatches lead to attenuation of fluorophore excitation and signal emission in fluorescence microscopy. We describe here the application of the perfluorocarbon, perfluorodecalin (PFD), as an infiltrative imaging medium which optically improves laser scanning confocal microscopy (LSCM) sample imaging at depth, without resorting to damaging increases in laser power and has minimal physiological impact2. We describe the protocol for use of PFD with Arabidopsis thaliana leaf tissue, which is optically complex as a result of its structure (Figure 1). PFD has a number of attributes that make it suitable for this use3. The refractive index of PFD (1.313) is comparable with that of water (1.333) and is closer to that of cytosol (approx. 1.4) than air (1.000). In addition, PFD is readily available, non-fluorescent and is non-toxic. The low surface tension of PFD (19 dynes cm-1) is lower than that of water (72 dynes cm-1) and also below the limit (25 - 30 dyne cm-1) for stomatal penetration4, which allows it to flood the spongy mesophyll airspaces without the application of a potentially destructive vacuum or surfactant. Finally and crucially, PFD has a great capacity for dissolving CO2 and O2, which allows gas exchange to be maintained in the flooded tissue, thus minimizing the physiological impact on the sample. These properties have been used in various applications which include partial liquid breathing and lung inflation5,6, surgery7, artificial blood8, oxygenation of growth media9, and studies of ice crystal formation in plants10. Currently, it is common to mount tissue in water or aqueous buffer for live confocal imaging. We consider that the use of PFD as a mounting medium represents an improvement on existing practice and allows the simple preparation of live whole leaf samples for imaging.

A Simple Method for Imaging Arabidopsis Leaves Using Perfluorodecalin as an Infiltrative Imaging Medium

We describe the use of perfluorodecalin as an infiltrative mounting medium. This is a simple method for improving depth of imaging in Arabidopsis thaliana leaf tissue with minimal physiological impact.

Um método simples para criação de imagens Arabidopsis Folhas Usando Perfluorodecalin como um meio de imagem infiltrativas

The problem of acquiring high-resolution images deep into biological samples is widely acknowledged1. In air-filled tissue such as the spongy mesophyll of ...

An Explant Assay for Assessing Cellular Behavior of the Cranial Mesenchyme

The central nervous system is derived from the neural plate that undergoes a series of complex morphogenetic movements resulting in formation of the neural tube in a process known as neurulation. During neurulation, morphogenesis of the mesenchyme that underlies the neural plate is believed to drive neural fold elevation. The cranial mesenchyme is comprised of the paraxial mesoderm and neural crest cells. The cells of the cranial mesenchyme form a pourous meshwork composed of stellate shaped cells and intermingling extracellular matrix (ECM) strands that support the neural folds. During neurulation, the cranial mesenchyme undergoes stereotypical rearrangements resulting in its expansion and these movements are believed to provide a driving force for neural fold elevation. However, the pathways and cellular behaviors that drive cranial mesenchyme morphogenesis remain poorly studied. Interactions between the ECM and the cells of the cranial mesenchyme underly these cell behaviors. Here we describe a simple ex vivo explant assay devised to characterize the behaviors of these cells. This assay is amendable to pharmacological manipulations to dissect the signaling pathways involved and live imaging analyses to further characterize the behavior of these cells. We present a representative experiment demonstrating the utility of this assay in characterizing the migratory properties of the cranial mesenchyme on a variety of ECM components.

The cranial mesenchyme undergoes dramatic morphogenic movements that likely provides a driving force for elevation of the neural folds1,2. Here we describe a simple ex vivo explant assay to characterize the cellular behaviors of the cranial mesenchyme during neurulation. This assay has numerous applications including being amenable to pharmacological manipulations and live imaging analyses.

Um ensaio de explante para avaliar o comportamento celular do mesênquima craniana

The central nervous system is derived from the neural plate that undergoes a series of complex morphogenetic movements resulting in formation of the ...

Identification of a Murine Erythroblast Subpopulation  Enriched in Enucleating Events by Multi-spectral Imaging Flow Cytometry

Erythropoiesis in mammals concludes with the dramatic process of enucleation that results in reticulocyte formation. The mechanism of enucleation has not yet been fully elucidated. A common problem encountered when studying the localization of key proteins and structures within enucleating erythroblasts by microscopy is the difficulty to observe a sufficient number of cells undergoing enucleation.&#160;We have developed a novel analysis protocol using multiparameter high-speed cell imaging in flow (Multi-Spectral Imaging Flow Cytometry), a method that combines immunofluorescent microscopy with flow cytometry, in order to identify efficiently a significant number of enucleating events, that allows to obtain measurements and perform statistical analysis.
We first describe here two in vitro erythropoiesis culture methods used in order to synchronize murine erythroblasts and increase the probability of capturing enucleation at the time of evaluation.&#160;Then, we describe in detail the staining of erythroblasts after fixation and permeabilization in order to study the localization of intracellular proteins or lipid rafts during enucleation by multi-spectral imaging flow cytometry.&#160;Along with size and DNA/Ter119 staining which are used to identify the orthochromatic erythroblasts, we utilize the parameters &#8220;aspect ratio&#8221; of a cell in the bright-field channel that aids in the recognition of elongated cells and &#8220;delta centroid XY Ter119/Draq5&#8221; that allows the identification of cellular events in which the center of Ter119 staining (nascent reticulocyte) is far apart from the center of Draq5 staining (nucleus undergoing extrusion), thus indicating a cell about to enucleate.&#160;The subset of the orthochromatic erythroblast population with high delta centroid and low aspect ratio is highly enriched in enucleating cells.

The present protocol describes a novel method of identifying a population of enucleating orthochromatic erythroblasts by multi-spectral imaging flow cytometry, providing a visualization of the erythroblast enucleation process.

Identificação de um Murino eritroblasto subpopulação enriquecido em enucleação Eventos da Multi-espectral de imagem de Citometria de Fluxo

Erythropoiesis in mammals concludes with the dramatic process of enucleation that results in reticulocyte formation. The mechanism of enucleation has not ...