Nous remercions Ye Wang pour des discussions et Sorin Pojoga de formation comportementale. Soutenu par le programme EUREKA NIH, National Eye Institute, le Programme de Pew Scholars, la James S. McDonnell (VD), et une subvention de formation Vision NIH (BJH).

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Aucun conflit d&#39;intérêt déclaré.

Multi-unit enregistrements sont devenus la norme pour analyser comment les réseaux neuronaux dans le cortex coder les informations de relance. Etant donné les récents progrès dans la technologie d&#39;électrodes, la mise en oeuvre d&#39;électrodes laminaire permet une caractérisation locale sans précédent de circuits corticaux. Bien que multi-électrodes enregistrements offrent des informations utiles sur la dynamique des populations de neurones, électrodes laminaire multiples permettent une plus grande résol...

<table border="1"><tbody><tr><td> Nom de l&#39;équipement </td><td> Société </td><td> Numéro de catalogue </td><td> Commentaires </td></tr><tr><td> Nan microdrive système de </td><td> Nan Instruments </td><td> NAN-S4 </td><td> Figure 2. Colliers personnalisés sont nécessaires pour utiliser le U-Probe. Tout mentionnée à l&#39;exception de l&#39;U-Probe est fourni par les instruments NAN. </td></tr><tr><td> Vis microdrives </td><td> Atelier d&#39;usinage du MIT </td><td></td><td> Tout ce qui est en mesure d&#39;obtenir un tube guide à la grille NAN doivent être appropriées. </td></tr><tr><td> Tubes en acier inoxydable Guide </td><td> Petites pièces </td><td> B00137QHNS (1) ou B00137QHO2 (5) </td><td> Ce sont 60 en long et coupé à la taille dans le laboratoire en utilisant une perceuse à main Dremel </td></tr><tr><td> Plexon U-Probe </td><td> Plexon, Inc </td><td> PLX-UP-16-25ED-100-SE-360-25T-500 </td><td> See U-Probe spécifications disponibles au <a href="www.plexon.com">www.plexon.com</a> voir aussi la figure 1. </td></tr></tbody></table> Tableau 1. Matériel. <table border="1"><tbody><tr><td> Nom du logiciel </td><td> Société </td><td> Site Web </td><td> Commentaires </td></tr><tr><td> NAN logiciels </td><td> NAN </td><td> <a href="http://www.naninstruments.com/DesignConcept.htm">http://www.naninstruments.com/DesignConcept.htm</a> </td><td> Interface informatique nécessite un port série supplémentaire pour adapter les systèmes et le matériel Plexon NAN </td></tr><tr><td> Trieuse Hors, FPAlign, PlexUtil, MATLAB programmes </td><td> Plexon </td><td> <a href="http://www.plexon.com/downloads.html#Software">http://www.plexon.com/downloads.html # Software</a> </td><td> Sous &#39;packages d&#39;installation » </td></tr><tr><td> NeuroExplorer </td><td> NeuroExplorer </td><td> <a href="http://www.neuroexplorer.com/">http://www.neuroexplorer.com/</a> </td><td> Sous «Ressources» </td></tr><tr><td> Version 0.1.1 CSDplotter </td><td> Klas H. Petterson </td><td> <a href="http://arken.umb.no/~klaspe/user_guide.pdf">http://arken.umb.no/ ~ klaspe / user_guide.pdf</a> </td><td></td></tr></tbody></table> Tableau 2. Software.

examining local network processing using multi-contact laminar electrode recording

Couches corticales sont omniprésents dans les structures néocortex 1-4 ​​qui se composent de très récurrente des réseaux locaux. Ces dernières années, des progrès significatifs ont été réalisés dans notre compréhension des différences dans les propriétés de réponse des neurones dans les différentes couches corticales 5-8, mais il reste encore beaucoup à apprendre si et comment les populations neuronales coder les informations spécifiques à un laminaire manière. Existants multi-électrodes techniques de tableau, bien instructif pour mesurer les réponses à travers plusieurs millimètres d&#39;espace cortical le long de la surface corticale, sont impropres à l&#39;approche de la question des circuits corticaux laminaire. Ici, nous présentons notre méthode de création et d&#39;enregistrement des neurones individuels et potentiels de champ locaux (LFPs) à travers les couches corticales du cortex visuel primaire (V1) en utilisant des électrodes laminaires multi-contact (figure 1; Plextrode U-Probe, Inc Plexon). Les méthodes de construction sont inclus appareil d&#39;enregistrement, l&#39;identification des couches corticales, et l&#39;identification des champs récepteurs des neurones individuels. Pour identifier les couches corticales, on mesure le potentiel de réponse évoquée (ERP) de la LFP séries chronologiques en utilisant plein champ stimulus flashé. Nous effectuons ensuite source de courant de densité (CDD) analyse pour identifier les inversions de polarité accompagnés par la configuration du puits-source à la base de la couche 4 (l&#39;évier est à l&#39;intérieur la couche 4, ci-après dénommée couche granulaire 9-12). Source de courant de densité est utile car il fournit un indice de l&#39;emplacement, l&#39;orientation et la densité du flux transmembranaire actuelle, nous permettant de positionner précisément les électrodes pour enregistrer à partir de toutes les couches dans une seule pénétration de 6, 11, 12.

Watch this Scientific Journal Video about Examining Local Network Processing using Multi-contact Laminar Electrode Recording at JoVE.com

Examining Local Network Processing using Multi-contact Laminar Electrode Recording

Une question fondamentale dans notre compréhension des circuits corticaux est de savoir comment les réseaux dans différentes couches corticales codent l&#39;information sensorielle. Ici, nous décrivons des techniques électrophysiologiques utilisant des électrodes laminaires multi-contact pour enregistrer une seule des unités et des potentiels de champ local et des analyses actuelles afin d&#39;identifier les couches corticales.

L&#39;examen de transformation réseau local en utilisant l&#39;enregistrement multi-contact d&#39;électrode laminaire

Cortical layers are ubiquitous structures throughout neocortex1-4 that consist of highly recurrent local networks. In recent years, significant progress ...

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Neuroscience

12.7K vues.  University of Texas. Une question fondamentale dans notre compréhension des circuits corticaux est de savoir comment les réseaux dans différentes couches corticales codent l'information sensorielle. Ici, nous décrivons des techniques électrophysiologiques utilisant des électrodes laminaires multi-contact pour enregistrer une seule des unités et des potentiels de champ local et des analyses actuelles afin d'identifier les couches corticales.

Vidéo: Examining Local Network Processing using Multi-contact Laminar Electrode Recording

Electrophysiology on Isolated Brainstem-spinal Cord Preparations from Newborn Rodents Allows Neural Respiratory Network Output Recording

While it is well known that the central respiratory drive is located in the brainstem, several aspects of its basic function, development, and response to stimuli remain to be fully understood. To overcome the difficulty of accessing the brainstem in the whole animal, isolation of the brainstem and part of the spinal cord is performed. This preparation is maintained in artificial cerebro-spinal fluid where gases, concentrations, and temperature are controlled and monitored. The output signal from the respiratory network is recorded by a suction electrode placed on the fourth ventral root. In this manner, stimuli can be directly applied onto the brainstem, and the effect can be recorded directly. The signal recorded is linked to the inspiratory signal sent to the diaphragm via the phrenic nerve, and can be described as bursts (around 8 bursts per minute). Analysis of these bursts (frequency, amplitude, length, and area under the curve) allows precise characterization of the stimulus effect on the respiratory network. The main limitation of this method is the viability of the preparation beyond the early post-natal stages. Thus, this method greatly focuses on the study of the whole network without the peripheral inputs in the newborn rat.

The central respiratory drive is located in the brainstem. Spontaneous respiratory motor output from an isolated brainstem-spinal cord is recorded by placing an electrode on the fourth ventral root. This experimental approach is valuable for pharmacological investigations or the assessment of respiratory challenges and genetic manipulations on rhythmic motor behavior.

Électrophysiologie sur isolés Cord Préparatifs du tronc cérébral-spinal de la naissance Rongeurs Permet Neural respiratoire Réseau d&#39;enregistrement de sortie

While it is well known that the central respiratory drive is located in the brainstem, several aspects of its basic function, development, and response to ...

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Neurosciences

Time-dependent Increase in the Network Response to the Stimulation of Neuronal Cell Cultures on Micro-electrode Arrays

Micro-electrode arrays (MEAs) can be used to investigate drug toxicity, design paradigms for next-generation personalized medicine, and study network dynamics in neuronal cultures. In contrast with more traditional methods, such as patch-clamping, which can only record activity from a single cell, MEAs can record simultaneously from multiple sites in a network, without requiring the arduous task of placing each electrode individually. Moreover, numerous control and stimulation configurations can be easily applied within the same experimental setup, allowing for a broad range of dynamics to be explored. One of the key dynamics of interest in these in vitro studies has been the extent to which cultured networks display properties indicative of learning. Mouse neuronal cells cultured on MEAs display an increase in response following training induced by electrical stimulation. This protocol demonstrates how to culture neuronal cells on MEAs; successfully record from over 95% of the plated dishes; establish a protocol to train the networks to respond to patterns of stimulation; and sort, plot, and interpret the results from such experiments. The use of a proprietary system for stimulating and recording neuronal cultures is demonstrated. Software packages are also used to sort neuronal units. A custom-designed graphical user interface is used to visualize post-stimulus time histograms, inter-burst intervals, and burst duration, as well as to compare the cellular response to stimulation before and after a training protocol. Finally, representative results and future directions of this research effort are discussed.

Mouse neuronal cells cultured on multi-electrode arrays display an increase in response following electrical stimulation. This protocol demonstrates how to culture neurons, how to record activity, and how to establish a protocol to train the networks to respond to patterns of stimulation.

Augmentation de la réponse du réseau à la stimulation des cultures cellulaires neuronales sur les tableaux de microélectrodes

Micro-electrode arrays (MEAs) can be used to investigate drug toxicity, design paradigms for next-generation personalized medicine, and study network ...

Concurrent Recording of Co-localized Electroencephalography and Local Field Potential in Rodent

Although electroencephalography (EEG) is widely used as a non-invasive technique for recording neural activities of the brain, our understanding of the neurogenesis of EEG is still very limited. Local field potentials (LFPs) recorded via a multi-laminar microelectrode can provide a more detailed account of simultaneous neural activity across different cortical layers in the neocortex, but the technique is invasive. Combining EEG and LFP measurements in a pre-clinical model can greatly enhance understanding of the neural mechanisms involved in the generation of EEG signals, and facilitate the derivation of a more realistic and biologically accurate mathematical model of EEG. A simple procedure for acquiring concurrent and co-localized EEG and multi-laminar LFP signals in the anesthetized rodent is presented here. We also investigated whether EEG signals were significantly affected by a burr hole drilled in the skull for the insertion of a microelectrode. Our results suggest that the burr hole has a negligible impact on EEG recordings.

This protocol describes a simple method for concurrent recording of co-localized electroencephalography (EEG) and multi-laminar local field potential in an anesthetized rat. A burr hole drilled in the skull for the insertion of a microelectrode is shown to produce negligible distortion of the EEG signal.

Enregistrement simultané d’électroencéphalographie co localisée et le potentiel de champ Local dans rongeurs

Although electroencephalography (EEG) is widely used as a non-invasive technique for recording neural activities of the brain, our understanding of the ...

Examining Monosynaptic Connections in Drosophila Using Tetrodotoxin Resistant Sodium Channels

Here, a new technique termed Tetrotoxin (TTX) Engineered Resistance for Probing Synapses (TERPS) is applied to test for monosynaptic connections between target neurons. The method relies on co-expression of a transgenic activator with the tetrodotoxin-resistant sodium channel, NaChBac, in a specific presynaptic neuron. Connections with putative post-synaptic partners are determined by whole-cell recordings in the presence of TTX, which blocks electrical activity in neurons that do not express NaChBac. This approach can be modified to work with any activator or calcium imaging as a reporter of connections. TERPS adds to the growing set of tools available for determining connectivity within networks. However, TERPS is unique in that it also reliably reports bulk or volume transmission and spillover transmission.

Examining Monosynaptic Connections in Drosophila Using Tetrodotoxin Resistant Sodium Channels

This article features a method to test the monosynaptic connections between neurons by employing tetrodotoxin and the tetrodotoxin-resistant sodium channel, NaChBac.

Examinant les connexions monosynaptiques chez la drosophile en utilisant des canaux sodiques tétrodotoxine résistant

Here, a new technique termed Tetrotoxin (TTX) Engineered Resistance for Probing Synapses (TERPS) is applied to test for monosynaptic connections between ...

Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice

This article demonstrates complete, detailed procedures for both in vivo bilateral recording and analysis of local field potential (LFP) in the cortical areas of mice, which are useful for evaluating possible laterality deficits, as well as for assessing brain connectivity and coupling of neural network activities in rodents. The pathological mechanisms underlying Alzheimer&#39;s disease (AD), a common neurodegenerative disease, remain largely unknown. Altered brain laterality has been demonstrated in aging people, but whether or not abnormal lateralization is one of the early signs of AD has not been determined. To investigate this, we recorded bilateral LFPs in 3-5-month-old AD model mice, APP/PS1, together with littermate wild type (WT) controls. The LFPs of the left and right secondary motor cortex (M2), specifically in the gamma band, were more synchronized in APP/PS1 mice than in WT controls, suggesting a declined hemispheric asymmetry of bilateral M2 in this AD mouse model. Notably, the recording and data analysis processes are flexible and easy to carry out, and can also be applied to other brain pathways when conducting experiments that focus on neuronal circuits.

We present in vivo electrophysiological recording of the local field potential (LFP) in bilateral secondary motor cortex (M2) of mice, which can be applied to evaluate hemisphere lateralization. The study revealed altered levels of synchronization between the left and right M2 in APP/PS1 mice compared to WT controls.

Évaluation de la latéralisation de l'hémisphère avec enregistrement potentiel de terrain local bilatéral dans le cortex moteur secondaire des souris

This article demonstrates complete, detailed procedures for both in vivo bilateral recording and analysis of local field potential (LFP) in the cortical ...

Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays

The roles and connectivity of specific types of neurons within the spinal cord dorsal horn (DH) are being delineated at a rapid rate to provide an increasingly detailed view of the circuits underpinning spinal pain processing. However, the effects of these connections for broader network activity in the DH remain less well understood because most studies focus on the activity of single neurons and small microcircuits. Alternatively, the use of microelectrode arrays (MEAs), which can monitor electrical activity across many cells, provides high spatial and temporal resolution of neural activity. Here, the use of MEAs with mouse spinal cord slices to study DH activity induced by chemically stimulating DH circuits with 4-aminopyridine (4-AP) is described. The resulting rhythmic activity is restricted to the superficial DH, stable over time, blocked by tetrodotoxin, and can be investigated in different slice orientations. Together, this preparation provides a platform to investigate DH circuit activity in tissue from na&#239;ve animals, animal models of chronic pain, and mice with genetically altered nociceptive function. Furthermore, MEA recordings in 4-AP-stimulated spinal cord slices can be used as a rapid screening tool to assess the capacity of novel antinociceptive compounds to disrupt activity in the spinal cord DH.

The combined use of microelectrode array technology and 4-aminopyridine-induced chemical stimulation for investigating network-level nociceptive activity in the spinal cord dorsal horn is outlined.

Enregistrement de l’activité du réseau dans les circuits nociceptifs rachidiens à l’aide de réseaux de microélectrodes

The roles and connectivity of specific types of neurons within the spinal cord dorsal horn (DH) are being delineated at a rapid rate to provide an ...

Observation des réseaux de microtubules dans les jonctions neuromusculaires et les cellules musculaires de la drosophile

Using Drosophila Larval Neuromuscular Junction and Muscle Cells to Visualize Microtubule Network

The microtubule network is an essential component of the nervous system. Mutations in many microtubules regulatory proteins are associated with neurodevelopmental disorders and neurological diseases, such as microtubule-associated protein Tau to neurodegenerative diseases, microtubule severing protein Spastin and Katanin 60 cause hereditary spastic paraplegia and neurodevelopmental abnormalities, respectively. Detection of microtubule networks in neurons is advantageous for elucidating the pathogenesis of neurological disorders. However, the small size of neurons and the dense arrangement of axonal microtubule bundles make visualizing the microtubule networks challenging. In this study, we describe a method for dissection of the larval neuromuscular junction and muscle cells, as well as immunostaining of &#945;-tubulin and microtubule-associated protein Futsch to visualize microtubule networks in Drosophila melanogaster. The neuromuscular junction permits us to observe both pre-and post-synaptic microtubules, and the large size of muscle cells in Drosophila larva allows for clear visualization of the microtubule network. Here, by mutating and overexpressing Katanin 60 in Drosophila melanogaster,&#160;and then examining the microtubule networks in the neuromuscular junction and muscle cells, we&#160;accurately reveal the regulatory role of Katanin 60 in neurodevelopment. Therefore, combined with the powerful genetic tools of Drosophila&#160;melanogaster, this protocol greatly facilitates genetic screening and microtubule dynamics analysis for the role of microtubule network regulatory proteins in the nervous system.

Pleins feux sur l’auteur : Comprendre le réseau de microtubules dans les jonctions neuromusculaires de la drosophile 

Here, we present a detailed protocol to visualize the microtubule networks in neuromuscular junctions and muscle cells. Combined with the powerful genetic tools of Drosophila melanogaster, this protocol greatly facilitates genetic screening and microtubule-dynamics analysis for the role of microtubule network regulatory proteins in the nervous system.

Utilisation de la jonction neuromusculaire larvaire de drosophile et des cellules musculaires pour visualiser le réseau de microtubules

The microtubule network is an essential component of the nervous system. Mutations in many microtubules regulatory proteins are associated with ...

Micro-Drive System Assembly and Electrode Array Implantation for Multichannel Recording in Mice

Begin by assembling the Microdrive system. Connect two computer-designed boards using two stulls and a screw that holds the movable Microdrive, and attach the connector to one board. Ensure the Microdrive can carry two sets of eight guide tubes for each side of the motor cortex or MC region.Cut the guide tubes to the same length. Cut 16 nichrome wires, each measuring approximately five centimeters long and 35 micrometers in diameter. Load the wires into the guide tubes and apply glue to fix them.Strip the wire insulation and twine each exposed wire to each pin from the connector following the channel map and the reference and ground electrodes, then slowly coat conducting paint onto each pin. Cover the pins using epoxy resin, then perform gold plating via an impedance tester to reduce the impedance of the electrode tips to approximately 350 kiloohms. For electrode array implantation, fix the anesthetized mouse in a stereotaxic apparatus and use a temperature controller to maintain its rectal temperature at 37 degrees Celsius.Then make a small midline incision to expose the skull. Remove the residual tissue using scissors and clean the skull with sterile saline-soaked cotton buds. Using a glass microelectrode filled with ink, mark the desired locations of the bilateral MC for implantation.Next, using a skull drill, carefully drill two small holes on both the left and right sides of the coordinated skull in the MC regions. Gently remove the dura mater from the holes with fine forceps. Then insert the Microdrive system into the center of the holes, using a micromanipulator at 10 micrometers per second.After finishing the insertion, fill the petroleum jelly into the dental cement walls and join the bottom plate of the Microdrive system and the dental cement walls with the mixed dental cement.