Los autores reconocen la fuente original de la idea de llevar a cabo la cultura rebanada en cinco embriones de ratón. Queremos agradecer a Joachim Kirsch por su generoso apoyo científico y Degen Anna para que actúen como nuestros gofer durante el rodaje. Este trabajo fue financiado por la Fundación Alemana de Investigación (Deutsche Forschungsgemeinschaft: Sonderforschungsbereich 488, Teilprojekt B7/B9) y la Universidad de Heidelberg (Excelencia racimo redes celulares).

Parte 1: Preparación para el corte y el cultivo. <ol><li> Prepare 10 cm placas de cultivo con corte medio (DMEM, 25% 1x HBSS, el 25% de suero fetal bovino, 0,5% de glucosa, 1 mM de glutamina, 2,5 mM HEPES, pH 7,3) y de 3 cm Millicell-CM-cultura 0.4 micras inserta la membrana y mantener en la incubadora a 37 ° C y 5% de CO 2. </li><li> Calentar el 4% de bajo punto de fusión de agarosa en PBS en el microondas y mantenerlo en la placa de calefacción para que quede aproximadamente a 37 ° C. </li><li> Llenar 10 cm bacteriológicas placas de Petri con PBS (140 mM NaCl, 2,7 mM KCl, 10 mM Na 2 HPO 4, 1,8 mm de KH 2 PO 4) y el lugar en el hielo. </li><li> Configure el dispositivo de refrigeración microtomo o asegurarse de que la bandeja de amortiguación y de refrigeración los elementos se almacenan en el congelador para pre-enfriar. </li></ol> Parte 2: La inclusión de embriones. <ol><li> Diseccionar embriones del útero y las examinan con un microscopio invertido fluorescentes para detectar la expresión de GFP. </li><li> Embriones en lugar de un plato invertido 10 cm Petri y orientarlos con tiras de papel Whatman para eliminar exceso de PBS. </li><li> Aplicar agarosa en el embrión para fijarlo en esa posición. Vamos agarosa solidifique. </li><li> Límite de la zona que rodea el embrión mediante el corte con una cuchilla de afeitar. </li><li> Gire el embrión embebido hacia el otro lado. </li><li> Aplicar más de agarosa en el tejido embrionario para asegurarse de que el embrión está plenamente integrado. </li><li> Prepare bloque de agarosa con bordes limpios y de montaje en vibratome plato con Loctite 406, un pegamento especial similar a la &quot;Krazy Glue&quot;. </li></ol> Parte 3: Cortar procedimiento. <ol><li> Configure la bandeja de buffer pre-enfriado y el disipador de calor. </li><li> Inserte el mandril con el tejido pegado y añade 1x HBSS (Ca 2 +-Mg 2 + libre de HBSS, 10 mM HEPES pH 7,3, 500 U / ml de penicilina / estreptomicina) hasta que esté cubierto. </li><li> Insertar y fijar un precleaned (70% etanol) hoja de microtomo. </li><li> Preparar 350 a 450 micras rodajas y transferirlos con pipetas Pasteur de vidrio acortado en placas de cultivo de tejidos se mantienen en hielo. </li><li> Con un par de pinzas, retire con cuidado de cada rebanada de agarosa y transferencia a membranas Millicell cultura. Aproximadamente 4 rebanadas pueden ser cultivadas en una membrana de tejido en una placa de 10 cm de cultura llena de 6 mL de medio de cultivo. </li><li> Incubar cortes a 37 ° C y 5% de CO 2 (medio de cultivo: DMEM, 25% 1x HBSS, el 25% de suero fetal bovino, 0,5% de glucosa, 1 mM glutamina, 2,5 mM HEPES, pH 7,3). Si uno realiza un lapso de tiempo la serie de imágenes se debe mantener el volumen de medio de constantes. En el caso de series de tiempo de imágenes para un corto período de tiempo es suficiente para dejar el medio como es. Para períodos más largos cultura cambia después de 12-20 horas se recomienda. </li></ol> Parte 4: fruto de imágenes del nervio espinal en el microscopio. <ol><li> Imagen de los nervios raquídeos a la colocación de una placa de tejido de 10 cm de la cultura, que contiene las membranas Millicell la cultura con las rebanadas, con un microscopio fluorescente en posición vertical. </li><li> Etiqueta de la orientación de las membranas de la cultura Millicell en platina del microscopio para posicionar correctamente en el punto de imagen la próxima vez. </li><li> Consecuencia la imagen del nervio espinal utilizando 4x (apertura numérica [NA] 0,1), 10x (NA 0,3) o 20x (NA 0.5) objetivos. </li></ol> La figura 1 muestra una serie de imágenes que representan el fruto del nervio espinal durante 20 horas de cultura con los objetivos de 4x y 10x. <img src="/files/ftp_upload/2309/2309fig1.jpg" alt="Figura 1" /> Figura 1 Imagen serie de consecuencia del nervio espinal en un corte transversal de un embrión tauGPF homocigotos. * = Neuronas motoras de la médula espinal ventral, flecha = DRG. El dorsal (D)-ventral (V), el eje de la rebanada se indica. Scalebars: 200 micras.

<ol>
	<li>Tucker, K. L., Meyer, M., Barde, Y. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neurotrophins+are+required+for+nerve+growth+during+development.">Neurotrophins are required for nerve growth during development.</a> Nat Neurosci. 4, 29-37 (2001).</li><li>Brachmann, I., Jakubick, V. C., Shaked, M., Unsicker, K., Tucker, K. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+simple+slice+culture+system+for+the+imaging+of+nerve+development+in+embryonic+mouse.">A simple slice culture system for the imaging of nerve development in embryonic mouse.</a> Dev Dyn. 236, 3514-3523 (2007).</li><li>Collingridge, G. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+brain+slice+preparation:+a+tribute+to+the+pioneer+Henry+McIlwain.">The brain slice preparation: a tribute to the pioneer Henry McIlwain.</a> Journal of neuroscience methods. 59, 5-9 (1995).</li><li>Katz, L. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Local+circuitry+of+identified+projection+neurons+in+cat+visual+cortex+brain+slices.">Local circuitry of identified projection neurons in cat visual cortex brain slices.</a> J Neurosci. 7, 1223-1249 (1987).</li><li>Hotary, K. B., Landmesser, L. T., Tosney, K. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Embryo+slices.">Embryo slices.</a> Methods Cell Biol. 51, 109-124 (1996).</li></ol>

En una amplia comparación de los métodos para preparar cultivos de embriones rebanada de embriones de ratón mitad de la gestación (E10 - E12), hemos observado que un vibratomo produce sin lugar a dudas los resultados más confiables con respecto tanto a la viabilidad general de las culturas y la reproducibilidad de los los patrones de derivación del nervio. Por el contrario, las rebanadas de preparados con un helicóptero del tejido McIlwain 3 resultó ser completamente inviable. Lo que originalmente se ...

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		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>HBSS 10x</td>
<td>&nbsp;</td>
<td>GIBCO</td>
<td>14180</td>
<td>&nbsp;</td>
<tr>
<td>Dissection tools</td>
<td>&nbsp;</td>
<td>FST</td>
<td>various</td>
<td>&nbsp;</td>
<tr>
<td>L.M.P. agarose</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>15517-022</td>
<td>&nbsp;</td>
<tr>
<td>Whatmann paper</td>
<td>&nbsp;</td>
<td>Whatman Int.</td>
<td>3030917</td>
<td>&nbsp;</td>
<tr>
<td>Shortened firepolished pipettes</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>DMEM</td>
<td>&nbsp;</td>
<td>GIBCO</td>
<td>41966</td>
<td>&nbsp;</td>
<tr>
<td>FBS</td>
<td>&nbsp;</td>
<td>GIBCO</td>
<td>10270-106</td>
<td>&nbsp;</td>
<tr>
<td>Pen Strep</td>
<td>&nbsp;</td>
<td>GIBCO</td>
<td>15140</td>
<td>&nbsp;</td>
<tr>
<td>L-glutamine 100x</td>
<td>&nbsp;</td>
<td>GIBCO</td>
<td>25030</td>
<td>&nbsp;</td>
<tr>
<td>Vibratome</td>
<td>&nbsp;</td>
<td>Microm International GmbH</td>
<td>HM 650 V</td>
<td>&nbsp;</td>
<tr>
<td>Fluorescent microscope</td>
<td>&nbsp;</td>
<td>Olympus</td>
<td>BX61WI</td>
<td>&nbsp;</td>
<tr>
<td>analySIS</td>
<td>&nbsp;</td>
<td>Soft Imaging System</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Millicell-CM inserts</td>
<td>&nbsp;</td>
<td>Millipore</td>
<td>PICMORG 50</td>
<td>&nbsp;</td>
<tr>
<td>10 cm culture plates</td>
<td>&nbsp;</td>
<td>Greiner Bio-One</td>
<td>633171</td>
<td>&nbsp;</td>
<tr>
<td>LOCTITE 406</td>
<td>&nbsp;</td>
<td>Henkel</td>
<td>142580</td>
<td>&nbsp;</td>
<tr>
<td>Razor blades</td>
<td>&nbsp;</td>
<td>Thermo Fisher</td>
<td>none</td>
<td>&nbsp;</td>
<tr>
<td>Dissecting microscope</td>
<td>&nbsp;</td>
<td>Nikon</td>
<td>SMZ800</td>
<td>&nbsp;</td>
<tr>
<td>HEPES</td>
<td>&nbsp;</td>
<td>Roth</td>
<td>9105.2</td>
<td>&nbsp;</td>
<tr>
<td>Glucose</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>G7021</td>
<td>&nbsp;</td>
<tr>
<td>x4 objective</td>
<td>&nbsp;</td>
<td>Olympus</td>
<td>PL series</td>
<td>&nbsp;</td>
<tr>
<td>x10 objective</td>
<td>&nbsp;</td>
<td>Olympus</td>
<td>UPLFL &#x2013;PH series</td>
<td>&nbsp;</td>
<tr>
<td>Filter</td>
<td>&nbsp;</td>
<td>Olympus</td>
<td>U-MNIBA2</td>
<td>&nbsp;</td>
<tr>
<td>CCD camera</td>
<td>&nbsp;</td>
<td>Soft Imaging System</td>
<td>SIS F-View II</td>
<td>&nbsp;</td>
<tr>
<td>Equipment for heated chamber</td>
<td>&nbsp;</td>
<td>Leica</td>
<td>CTI-Controller 3700 and incubator S #11531171</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

organotypic slice culture of gfp-expressing mouse embryos for real-time imaging of peripheral nerve outgrowth

Para muchos fines, el cultivo de embriones de ratón ex vivo como rebanadas organotípicos es deseable. Por ejemplo, contamos con una línea de ratones transgénicos (tauGFP) en la que es exclusivamente la versión mejorada de la proteína verde fluorescente (EGFP) se expresa en todas las neuronas del sistema nervioso en desarrollo de una central y periférico, lo que permite la posibilidad de tanto en cine como la inervación de las patas delanteras y de manipular este proceso con las técnicas farmacológicas y genéticas 2. El parámetro más importante en el cultivo exitoso de las culturas rebanada tal es el método por el cual los cortes están preparados. Después de extensas pruebas de una variedad de métodos, hemos encontrado que un vibratomo es el mejor dispositivo posible para cortar los embriones de forma que de manera rutinaria como resultado una cultura que muestra la viabilidad en un período de varios días, y lo más importante, se desarrolla en una época de manera específica. Para mediados de la gestación de embriones, lo que incluye la consecuencia normal de los nervios espinales de la médula espinal y los ganglios de la raíz dorsal de sus objetivos en la periferia y la correcta determinación de tejido óseo y muscular. En este trabajo se presenta un método para el procesamiento de embriones todo el día embrionario (E) E10 a E12 en 300 a 400 rebanadas micrómetro para el cultivo en un estándar de cultivo de tejidos incubadora, que pueden ser estudiados por hasta dos días después de la preparación rebanada. Fundamental para el éxito de este enfoque es el uso de un vibratome para cortar cada embrión de agarosa embebidos. Esto es seguido por el cultivo de los cortes en la cultura inserta Millicell membrana colocada sobre un pequeño volumen de medio, lo que resulta en una técnica de cultivo de la interfaz. Una camada con un promedio de siete embriones habitualmente produce por lo menos 14 sectores (2-3 porciones de la región extremidad anterior por embrión), que varía ligeramente debido a la edad de los embriones, así como el grosor de las rodajas. Alrededor del 80% de las rebanadas de cultivo muestran consecuencia del nervio, que puede ser medido througout el período de cultivo 2. Los resultados representativos utilizando la línea de ratón tauGFP se demuestran.

Watch this Scientific Journal Video about Organotypic Slice Culture of GFP-expressing Mouse Embryos for Real-time Imaging of Peripheral Nerve Outgrowth at JoVE.com

Organotypic Slice Culture of GFP-expressing Mouse Embryos for Real-time Imaging of Peripheral Nerve Outgrowth

Se presenta un método para preparar cortes organotípicos de embriones de ratón mitad de la gestación para el cultivo y la imagen de lapso de tiempo de extensión del nervio periférico.

Cultura rebanada de organotípicos que expresan GFP embriones de ratón de imágenes en tiempo real al crecimiento excesivo de Nervio Periférico

For many purposes, the cultivation of mouse embryos ex vivo as organotypic slices is desirable. For example, we employ a transgenic mouse line (tauGFP) in ...

organotypic-slice-culture-gfp-expressing-mouse-embryos-for-real-time

Research

JoVE Journal

Neuroscience

16.1K vistas.  University of Heidelberg. Se presenta un método para preparar cortes organotípicos de embriones de ratón mitad de la gestación para el cultivo y la imagen de lapso de tiempo de extensión del nervio periférico.

Video: Organotypic Slice Culture of GFP-expressing Mouse Embryos for Real-time Imaging of Peripheral Nerve Outgrowth

The Organotypic Hippocampal Slice Culture Model for Examining Neuronal Injury

Organotypic hippocampal slice culture is an in vitro method to examine mechanisms of neuronal injury in which the basic architecture and composition of the hippocampus is relatively preserved 1. The organotypic culture system allows for the examination of neuronal, astrocytic and microglial effects, but as an ex vivo preparation, does not address effects of blood flow, or recruitment of peripheral inflammatory cells. To that end, this culture method is frequently used to examine excitotoxic and hypoxic injury to pyramidal neurons of the hippocampus, but has also been used to examine the inflammatory response. Herein we describe the methods for generating hippocampal slice cultures from postnatal rodent brain, administering toxic stimuli to induce neuronal injury, and assaying and quantifying hippocampal neuronal death.

The organoptypic hippocampal slice culture model is an in vitro model used to examine neuronal injury in a variety of paradigms. In this article, we describe the methods for generating slice cultures and quantifying neuronal injury.

El organotípicos rebanada hipocampo modelo de cultivo para el examen de la lesión neuronal

Organotypic hippocampal slice culture is an in vitro method to examine mechanisms of neuronal injury in which the basic architecture and composition of ...

Investigación

Neurociencias

Organotypic Hippocampal Slice Cultures

The hippocampus, a component of the limbic system, plays important roles in long-term memory and spatial navigation 1. Hippocampal neurons can modify the strength of their connections after brief periods of strong activation. This phenomenon, known as long-term potentiation (LTP) can last for hours or days and has become the best candidate mechanism for learning and memory 2. In addition, the well defined anatomy and connectivity of the hippocampus 3 has made it a classical model system to study synaptic transmission and synaptic plasticity4.
As our understanding of the physiology of hippocampal synapses grew and molecular players became identified, a need to manipulate synaptic proteins became imperative. Organotypic hippocampal cultures offer the possibility for easy gene manipulation and precise pharmacological intervention but maintain synaptic organization that is critical to understanding synapse function in a more naturalistic context than routine culture dissociated neurons methods.
Here we present a method to prepare and culture hippocampal slices that can be easily adapted to other brain regions. This method allows easy access to the slices for genetic manipulation using different approaches like viral infection 5,6 or biolistics 7. In addition, slices can be easily recovered for biochemical assays 8, or transferred to microscopes for imaging 9 or electrophysiological experiments 10.

We describe a method to prepare organotypic hippocampal slices that can be easily adapted to other brain regions. Brain slices are laid on porous membranes and culture media is allowed to form an interface. This method preserves the gross architecture of the hippocampus for up to 2 weeks in culture.

Organotípicos culturas rebanada hipocampo

The hippocampus, a component of the limbic system, plays important roles in long-term memory and spatial navigation 1. Hippocampal neurons can modify the ...

An Organotypic Slice Assay for High-Resolution Time-Lapse Imaging of Neuronal Migration in the Postnatal Brain

Neurogenesis in the postnatal brain depends on maintenance of three biological events: proliferation of progenitor cells, migration of neuroblasts, as well as differentiation and integration of new neurons into existing neural circuits. For postnatal neurogenesis in the olfactory bulbs, these events are segregated within three anatomically distinct domains: proliferation largely occurs in the subependymal zone (SEZ) of the lateral ventricles, migrating neuroblasts traverse through the rostral migratory stream (RMS), and new neurons differentiate and integrate within the olfactory bulbs (OB). The three domains serve as ideal platforms to study the cellular, molecular, and physiological mechanisms that regulate each of the biological events distinctly. This paper describes an organotypic slice assay optimized for postnatal brain tissue, in which the extracellular conditions closely mimic the in vivo environment for migrating neuroblasts. We show that our assay provides for uniform, oriented, and speedy movement of neuroblasts within the RMS. This assay will be highly suitable for the study of cell autonomous and non-autonomous regulation of neuronal migration by utilizing cross-transplantation approaches from mice on different genetic backgrounds.

This protocol describes an organotypic slice assay optimized for the postnatal brain and high-resolution time-lapse imaging of neuroblast migration in the rostral migratory stream.

Un ensayo Cortar organotípicos de alta resolución de imágenes a intervalos de tiempo de la migración neuronal en el cerebro postnatal

Neurogenesis in the postnatal brain depends on maintenance of three biological events: proliferation of progenitor cells, migration of neuroblasts, as ...

Multiple-mouse Neuroanatomical Magnetic Resonance Imaging

The field of mouse phenotyping with magnetic resonance imaging (MRI) is rapidly growing, motivated by the need for improved tools for characterizing and evaluating mouse models of human disease. MRI is an excellent modality for investigating genetically altered animals. It is capable of whole brain coverage, can be used in vivo, and provides multiple contrast mechanisms for investigating different aspects of neuranatomy and physiology. The advent of high-field scanners along with the ability to scan multiple mice simultaneously allows for rapid phenotyping of novel mutations.
Effective mouse MRI studies require attention to many aspects of experiment design. In this article, we will describe general methods to acquire quality images for mouse phenotyping using a system that images mice concurrently in shielded transmit/receive radio frequency (RF) coils in a common magnet (Bock et al., 2003). We focus particularly on anatomical phenotyping, an important and accessible application that has shown a high potential for impact in many mouse models at our imaging centre. Before we can provide the detailed steps to acquire such images, there are important practical considerations for both in vivo brain imaging (Dazai et al., 2004) and ex vivo brain imaging (Spring et al., 2007) that should be noted. These are discussed below.

Magnetic resonance imaging (MRI) has become an increasingly popular tool for examining the phenotype of genetically altered mice. This article illustrates the methods necessary to achieve high-throughput phenotyping of genetically altered mice using multiple-mouse MRI.

Múltiples imágenes del ratón neuroanatómicos de Resonancia Magnética

The field of mouse phenotyping with magnetic resonance imaging (MRI) is rapidly growing, motivated by the need for improved tools for characterizing and ...

Whole Cell Recording from an Organotypic Slice Preparation of Neocortex

We have been studying the expression and functional roles of voltage-gated potassium channels in pyramidal neurons from rat neocortex. Because of the lack of specific pharmacological agents for these channels, we have taken a genetic approach to manipulating channel expression. We use an organotypic culture preparation (16) in order to maintain cell morphology and the laminar pattern of cortex. We typically isolate acute neocortical slices at postnatal days 8-10 and maintain the slices in culture for 3-7 days. This allows us to study neurons at a similar age to those in our work with acute slices and minimizes the development of exuberant excitatory connections in the slice. We record from visually-identified pyramidal neurons in layers II/III or V using infrared illumination (IR-) and differential interference contrast microscopy (DIC) with whole cell patch clamp in current- or voltage-clamp. We use biolistic (Gene gun) transfection of wild type or mutant potassium channel DNA to manipulate expression of the channels to study their function. The transfected cells are easily identified by epifluorescence microscopy after co-transfection with cDNA for green fluorescent protein (GFP). We compare recordings of transfected cells to adjacent, untransfected neurons in the same layer from the same slice.

This is a protocol to prepare and maintain a neocortical slice preparation in organotypic culture for the purpose of making electrical recordings from pyramidal neurons.

Grabación de células enteras de una rebanada preparación organotípicos del neocórtex

We have been studying the expression and functional roles of voltage-gated potassium channels in pyramidal neurons from rat neocortex.  Because of the ...

Electrophysiological Characterization of GFP-Expressing Cell Populations in the Intact Retina

Studying the physiological properties and synaptic connections of specific neurons in the intact tissue is a challenge for those cells that lack conspicuous morphological features or show a low population density. This applies particularly to retinal amacrine cells, an exceptionally multiform class of interneurons that comprise roughly 30 subtypes in mammals1. Though being a crucial part of the visual processing by shaping the retinal output2, most of these subtypes have not been studied up to now in a functional context because encountering these cells with a recording electrode is a rare event.
Recently, a multitude of transgenic mouse lines is available that express fluorescent markers like green fluorescent protein (GFP) under the control of promoters for membrane receptors or enzymes that are specific to only a subset of neurons in a given tissue3,4. These pre-labeled cells are therefore accessible to directed microelectrode targeting under microscopic control, permitting the systematic study of their physiological properties in situ. However, excitation of fluorescent markers is accompanied by the risk of phototoxicity for the living tissue. In the retina, this approach is additionally hampered by the problem that excitation light causes appropriate stimulation of the photoreceptors, thus inflicting photopigment bleaching and transferring the retinal circuits into a light-adapted condition. These drawbacks are overcome by using infrared excitation delivered by a mode-locked laser in short pulses of the femtosecond range. Two-photon excitation provides energy sufficient for fluorophore excitation and at the same time restricts the excitation to a small tissue volume minimizing the hazards of photodamage5. Also, it leaves the retina responsive to visual stimuli since infrared light (&gt;850 nm) is only poorly absorbed by photopigments6.
In this article we demonstrate the use of a transgenic mouse retina to attain electrophysiological in situ recordings from GFP-expressing cells that are visually targeted by two-photon excitation. The retina is prepared and maintained in darkness and can be subjected to optical stimuli which are projected through the condenser of the microscope (Figure 1). Patch-clamp recording of light responses can be combined with dye filling to reveal the morphology and to check for gap junction-mediated dye coupling to neighboring cells, so that the target cell can by studied on different experimental levels.

This article depicts the recording of individual cells from fluorescently tagged neuronal populations in the intact mouse retina. By using two-photon infrared excitation transgenetically labeled cells were targeted for patch-clamp recording to study their light responses, receptive field properties, and morphology.

Caracterización electrofisiológica de las buenas prácticas agrarias que expresan las poblaciones de células en la retina intacta

Studying the physiological properties and synaptic connections of specific neurons in the intact tissue is a challenge for those cells that lack ...

A Protocol for the Administration of Real-Time fMRI Neurofeedback Training

Neurologic disorders are characterized by abnormal cellular-, molecular-, and circuit-level functions in the brain. New methods to induce and control neuroplastic processes and correct abnormal function, or even shift functions from damaged tissue to physiologically healthy brain regions, hold the potential to dramatically improve overall health. Of the current neuroplastic interventions in development, neurofeedback training (NFT) from functional Magnetic Resonance Imaging (fMRI) has the advantages of being completely non-invasive, non-pharmacologic, and spatially localized to target brain regions, as well as having no known side effects. Furthermore, NFT techniques, initially developed using fMRI, can often be translated to exercises that can be performed outside of the scanner without the aid of medical professionals or sophisticated medical equipment. In fMRI NFT, the fMRI signal is measured from specific regions of the brain, processed, and presented to the participant in real-time. Through training, self-directed mental processing techniques, that regulate this signal and its underlying neurophysiologic correlates, are developed. FMRI NFT has been used to train volitional control over a wide range of brain regions with implications for several different cognitive, behavioral, and motor systems. Additionally, fMRI NFT has shown promise in a broad range of applications such as the treatment of neurologic disorders and the augmentation of baseline human performance. In this article, we present an fMRI NFT protocol developed at our institution for modulation of both healthy and abnormal brain function, as well as examples of using the method to target both cognitive and auditory regions of the brain.

The ability to induce and/or control neural plasticity may be critical in future treatments for neurologic disorders and the recovery from brain injury. In this paper, we present a protocol on the use of neurofeedback training with functional magnetic resonance imaging to modulate human brain function.

Un protocolo para la administración de Real-Time fMRI entrenamiento de Neurofeedback

Neurologic disorders are characterized by abnormal cellular-, molecular-, and circuit-level functions in the brain. New methods to induce and control ...

Time-lapse Confocal Imaging of Migrating Neurons in Organotypic Slice Culture of Embryonic Mouse Brain Using In Utero Electroporation

In utero electroporation is a rapid and powerful approach to study the process of radial migration in the cerebral cortex of developing mouse embryos. It has helped to describe the different steps of radial migration and characterize the molecular mechanisms controlling this process. To directly and dynamically analyze migrating neurons they have to be traced over time. This protocol describes a workflow that combines in utero electroporation with organotypic slice culture and time-lapse confocal imaging, which allows for a direct examination and dynamic analysis of radially migrating cortical neurons. Furthermore, detailed characterization of migrating neurons, such as migration speed, speed profiles, as well as radial orientation changes, is possible. The method can easily be adapted to perform functional analyses of genes of interest in radially migrating cortical neurons by loss and gain of function as well as rescue experiments. Time-lapse imaging of migrating neurons is a state-of-the-art technique that once established is a potent tool to study the development of the cerebral cortex in mouse models of neuronal migration disorders.

Time-lapse Confocal Imaging of Migrating Neurons in Organotypic Slice Culture of Embryonic Mouse Brain Using In Utero Electroporation

This protocol provides instructions for direct observation of radially migrating cortical neurons. In utero electroporation, organotypic slice culture, and time-lapse confocal imaging are combined to directly and dynamically study the effects of overexpression or downregulation of genes of interest in migrating neurons and to analyze their differentiation during development.

Time-lapse Imágenes confocales de las neuronas migratorias en la cultura organotípica en rebanadas de cerebro de ratón embrionario<em&gt; En Utero</em&gt; Electroporación

In utero electroporation is a rapid and powerful approach to study the process of radial migration in the cerebral cortex of developing mouse embryos. It ...

Ex Utero Electroporation and Organotypic Slice Cultures of Embryonic Mouse Brains for Live-Imaging of Migrating GABAergic Interneurons

GABAergic interneurons (INs) are critical components of neuronal networks that drive cognition and behavior. INs destined to populate the cortex migrate tangentially from their place of origin in the ventral telencephalon (including from the medial and caudal ganglionic eminences (MGE, CGE)) to the dorsal cortical plate in response to a variety of intrinsic and extrinsic cues. Different methodologies have been developed over the years to genetically manipulate specific pathways and investigate how they regulate the dynamic cytoskeletal changes required for proper IN migration. In utero electroporation has been extensively used to study the effect of gene repression or overexpression in specific IN subtypes while assessing the impact on morphology and final position. However, while this approach is readily used to modify radially migrating pyramidal cells, it is more technically challenging when targeting INs. In utero electroporation generates a low yield given the decreased survival rates of pups when electroporation is conducted before e14.5, as is customary when studying MGE-derived INs. In an alternative approach, MGE explants provide easy access to the MGE and facilitate the imaging of genetically modified INs. However, in these explants, INs migrate into an artificial matrix, devoid of endogenous guidance cues and thalamic inputs. This prompted us to optimize a method where INs can migrate in a more naturalistic environment, while circumventing the technical challenges of in utero approaches. In this paper, we describe the combination of ex utero electroporation of embryonic mouse brains followed by organotypic slice cultures to readily track, image and reconstruct genetically modified INs migrating along their natural paths in response to endogenous cues. This approach allows for both the quantification of the dynamic aspects of IN migration with time-lapse confocal imaging, as well as the detailed analysis of various morphological parameters using neuronal reconstructions on fixed immunolabeled tissue.

Ex Utero Electroporation and Organotypic Slice Cultures of Embryonic Mouse Brains for Live-Imaging of Migrating GABAergic Interneurons

Here, we provide a low-cost and reliable method to generate electroporated brain organotypic slice cultures from mouse embryos suitable for confocal microscopy and live-imaging techniques.

Ex útero Electroporación y culturas Organotypic rebanada de cerebros embrionarios de ratón para vivir-la proyección de imagen de interneuronas GABAérgicas de migrando

GABAergic interneurons (INs) are critical components of neuronal networks that drive cognition and behavior. INs destined to populate the cortex migrate ...

Preparation and Immunostaining of Myelinating Organotypic Cerebellar Slice Cultures

In the nervous system, myelin is a complex membrane structure generated by myelinating glial cells, which ensheathes axons and facilitates fast electrical conduction. Myelin alteration has been shown to occur in various neurological diseases, where it is associated with functional deficits. Here, we provide a detailed description of an ex vivo model consisting of mouse organotypic cerebellar slices, which can be maintained in culture for several weeks and further be labeled to visualize myelin.

Here we present a method to prepare organotypic slice cultures from mouse cerebellum and myelin sheath staining by immunohistochemistry suitable for investigating mechanisms of myelination and remyelination in the central nervous system.

Preparación y el Immunostaining de Myelinating Organotypic rebanada cerebelosa culturas

In the nervous system, myelin is a complex membrane structure generated by myelinating glial cells, which ensheathes axons and facilitates fast electrical ...