Name: preparation of neuronal co-cultures with single cell precision
Uploaded: 2014-05-20T13:00:00
Description: Watch this Scientific Journal Video about Preparation of Neuronal Co-cultures with Single Cell Precision at JoVE.com

Forfatterne er taknemmelige for Ulrich Marggraf (ISA) på SU-8 fabrikation og Maria Becker (ISA) på SEM billeddannelse. Forskningen blev støttet af Deutsche Forschungsgemeinschaft (DFG WE3737/3-1), en Bundesministerium für Bildung und Forschung tilskud (BMBF 0101-31P6541) og af Ministerium für Innovation, Wissenschaft und Forschung des Landes Nordrhein-Westfalen. Heike Hardelauf takker International Leibniz Graduate School &quot;Systembiologi Lab-on-a-chip&quot; for finansiel støtte.

Protokollerne er beregnet til hjerneforskere, og er opsummeret i figur 2.. Som sådan er det anbefales at microfabrication af SU-8 mestre anvendes til PDMS replikering er outsourcet til kommercielle eller institutionelle faciliteter. De to lag maske designs er frit tilgængelige som supplerende oplysninger (ZIP) på Royal Society of Chemistry hjemmeside 12. Vigtigere er det, at det første SU-8 lag fremstilles i en dybde på 2,5-3,0 um, og den anden til en dybde på 25-30 um. Disse er vigtige...

<ol>
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Mikrofluid opstillingsindretningen teknik er den første af sin slags, der giver præcision enkelt neuron håndtering for at etablere minimalistiske kulturer. Sammen med in situ biomateriale mønster metode, en kraftfuld tilgang til at justere cellemønstre med microfluidic strukturer, disse minimalistiske kulturer har høj intercompartment tilslutningsmuligheder niveauer med reduceret lokal entanglement. Disse funktioner kan bruges til effektiv undersøgelse af inter-rum overførsel og med enkle design ændrin...

<html> Neuronvæv er meget kompleks; en heterogen cellulær blanding, der er rumligt bestilt inden for definerede lag og rum og med plastik tilslutning via celle kontakter og især via Axon og dendritceller udvækster. Nye teknikker er forpligtet til at give større eksperimentel frihed til at få dybere indsigt og optrævle mekanismer centrale for sygdom, udvikling og sund funktion. Den Campenot kammer 1,2 og mere for nylig microfabricated udførelsesformer 3,4 kan anvendes til ex vivo-fremstilling af netværksforbundne neuronale co-kulturer med evnen til selektivt at forstyrre de forskellige somatiske populationer og også deres neurit udvækster. Disse mikrofluidenheder er for eksempel blevet brugt til at studere axon degeneration og regeneration følgende kemiske 5,6 eller laser axotomi 6-8, tauopathy 9, viral spredning 10,11, og mRNA lokalisering i axoner 4. ent &quot;&gt; At udvide rækkevidden af ​​synæstesi er den teknologiske udvikling, der kræves for at forberede minimalistiske neuronale co-kulturer. Dette muliggør molekyleudretningen af ​​den neuronale netværk for undersøgelse af systemet med en enkelt celle og sub-cellulær præcision. Kravet om minimale celleantal åbner mulighed for at analysere sjældne celletyper, herunder dopaminerge substantia nigra-celler er relevante for Parkinsons sygdom, spiral ganglier fra øret, perifere neuroner og stamceller. Ud over dette, cellulære økonomi er relevant for 3R-initiativet. Ved hjælp af disse mikrofluid platforme, store toksicitet skærme eller andre high throughput, kan nu betragtes data rige eksperimentel serie kræver dyr neuroner. I dette papir protokoller for fremstilling og anvendelse af en mikrofluid anordning er beskrevet. Mikrofluid opstillingsindretningen i kombination med en in situ biomaterial mønster metode kan anvendes til registrering af tæt forbundne neuronale co-kulturer under anvendelse af minimale celleantal. Mikrofluid opstillingsindretningen er baseret på en differentiel strøm tilgang 12-15, hvorved mikrostrukturerede fælder er placeret inden for en fluidisk kredsløb (illustreret sammen med SEM billeder i figur 1). Stien 0 → 1 har lavere fluidic modstand (R 2&gt; R 1) til transport af neuroner til en lineær række af mikrostrukturerede åbninger - indløb til de neuritvækst kanaler. Belægning af fælden ved en enkelt celle lokalt hæmmer flowet at aflede strømlinierne til at indfange de efterfølgende celler i tilstødende fælder. Komplet belægning af fælder i array skifter fluidic ratio (R1&gt; R2) for at omstille strømlinierne i Serpentine sti (0 → 2) for at frembringe en bypass driftsform til fjernelse af overskydende neuroner. Figur 1.. Mikrofluid Circuit. A) Den differentielle modstand fluidisk kredsløb for enkelt neuron opstillingsindretningen med flankerende kultur kamre er indbyrdes forbundet ved neuritudvækst kanaler. B, C) ​​SEM billeder af dobbeltlaget opdelte neuron co-kultur array med menisk pinning mikro-søjler. Med denne udformning blev Trident-formede neuron fældefangst strukturer anvendes til at fremme fascikulationer af neurit udvækster. Figur og legende gengivet med tilladelse fra Royal Society of Chemistry (RSC) 12.. <a href="https://www.jove.com/files/ftp_upload/51389/51389fig1highres.jpg" target="_blank">Klik her for at se større billede.</a> Udarbejdelsen af ​​micropatterned neuronale netværk på plane underlag kan let opnås (for exampl<html> es fra vores gruppe, se FRIMAT et al. 16 og Heike et al. 17). Men indkapsle bioaktive materiale mønstre indenfor PDMS enheder, og med kravet om mikrometer skala tilpasning af disse til de mikrofluidkanaler udgør en stor teknisk udfordring. I afsnit 3.1 en protokol for den i chippen, eller in situ, udarbejdelse af biomateriale mønstre præsenteres. Disse mønstre muliggøre neuron registrering under langvarige kultur tidsplaner og fremme udvækster mellem rummene. Menisk-pinning mikrostrukturer anvendes til at justere en såkaldt vand maske med neuron arraying sites og neuritudvækst kanaler. Vandet maske beskytter adhæsionsmolekyleaktiviteter belægninger under plasmabehandling, mens eksponerede overflader disintegreres at definere biomateriale mønster. Desuden er protokoller indeholdt cellekultur og fluidisk isolation nødvendig til selektiv behandling af de forskellige co-kultur kamre. ve_content &quot;&gt; De protokoller er designet til at udnytte brugervenlige principper for blød litografi til replikation af poly (dimethylsiloxan) (PDMS) mikrofluidenheder 18. Tilsvarende i situ biomateriale mønster er ligetil, udnytte fordampning og overfladespænding fænomener, og kun kræver en billig håndholdt plasma kilde. mikrofluid kredsløb effektivt programmer celle lastning og rum specifikke behandlinger, der gør disse operationer blot et spørgsmål om udlevering materialer i den rigtige bundporten og sugning ovenfra. På denne måde er det hensigten at give neurobiologer frihed til at forberede og anvende mikrofluidenheder i deres egne laboratorier.

<table border="0" cellpadding="0" cellspacing="0" width="857">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">PDMS Sylgard 184</td>
			<td style="width:163px;">Dow Corning</td>
			<td style="width:143px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">PDMS Elastosil RT 601</td>
			<td style="width:163px;">Wacker</td>
			<td style="width:143px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">Coverslips</td>
			<td style="width:163px;">VWR</td>
			<td>630-1590</td>
			<td>130-160 mm thick</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">3 mm Biopsy Punches</td>
			<td style="width:163px;">Kai Medical</td>
			<td style="width:143px;"></td>
			<td>Handle with care - extremely sharp</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Tygon Tubing</td>
			<td style="width:163px;">Fisher Scientific</td>
			<td style="width:143px;">S-50-HL</td>
			<td>1.65 mm ID; 3.35 mm OD</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">1 mL Syringe (Inkjekt and Omnifix)</td>
			<td style="width:163px;">Braun</td>
			<td style="width:143px;">6064204</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:235px;">4-Way Tubing Connector</td>
			<td style="width:163px;">VWR or Fisher Scientific</td>
			<td style="width:143px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">Flow Regulator</td>
			<td style="width:163px;">Harvard Apparatus</td>
			<td style="width:143px;">722645</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:235px;">0.5 mm Pins</td>
			<td style="width:163px;">Dressmaking Departments</td>
			<td style="width:143px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:235px;">PLL-g-PEG</td>
			<td style="width:163px;">SuSoS</td>
			<td style="width:143px;">PLL(20)-g[3.5]-PEG(5)</td>
			<td>Stability in storage can be an issue</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">poly-D-lysine</td>
			<td style="width:163px;">Sigma-Aldrich</td>
			<td style="width:143px;">P6407</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">poly-lysine-FITC</td>
			<td style="width:163px;">Sigma-Aldrich</td>
			<td style="width:143px;">P3069</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">poly-ornithine</td>
			<td style="width:163px;">Sigma-Aldrich</td>
			<td style="width:143px;">P4957</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">fibronectin</td>
			<td style="width:163px;">Sigma-Aldrich</td>
			<td style="width:143px;">F2006</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">laminin</td>
			<td style="width:163px;">Sigma-Aldrich</td>
			<td style="width:143px;">L2020</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">PBS</td>
			<td style="width:163px;">Sigma-Aldrich</td>
			<td style="width:143px;">P4417</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">Inverted Fluorescent Microscope</td>
			<td style="width:163px;"></td>
			<td style="width:143px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:235px;">Example Aspiration Pump</td>
			<td style="width:163px;">KNF Neuberger, Laboport</td>
			<td style="width:143px;">N811KVP</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:235px;">Hand Held Corona Discharge Device</td>
			<td style="width:163px;">Leybold-Heraeus, USA</td>
			<td style="width:143px;">VP23</td>
			<td>May not comply with your country&#39;s safety standards</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">Femto Plasma Oven</td>
			<td style="width:163px;">Diener Electronic</td>
			<td style="width:143px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:235px;">Vacuum Dessicator or Centrifuge</td>
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preparation of neuronal co-cultures with single cell precision

Mikrofluidenheder udførelsesformer af Campenot kammer har tiltrukket stor interesse fra neurovidenskab samfund. Disse indbyrdes forbundne co-kultur platforme kan bruges til at undersøge en række spørgsmål, der spænder udviklingsmæssige og funktionelle neurobiologi til infektion og sygdom formering. Men konventionelle systemer kræver betydelige cellulære indgange (mange tusinde per rum), mangelfulde for at studere lav hyppighed celler, såsom primære dopaminerge substantia nigra, spiral ganglier, og Drosophilia melanogaster neuroner og upraktisk for high throughput eksperimenter. Den tætte kulturer er også meget lokalt sammenfiltrede, med få udvækster (&lt;10%), der forbinder de to kulturer. I dette papir ligefremme mikrofluid og mønster protokoller er beskrevet som disse udfordringer: (i) en mikrofluid enkelt neuron arraying metode, og (ii) en vand maskering metode til plasma patterning biomateriale belægninger til auspicesSter neuroner og fremme udvækst mellem rummene. Minimalistiske neuronale co-kulturer blev fremstillet med højt niveau (&gt; 85%) intercompartment forbindelse og kan anvendes til high throughput neurobiologi eksperimenter med enkelt celle præcision.

Vand maskering exploits overfladespænding. Trykket tolerance på luft-væske grænsefladen skalaer omvendt proportionalt med krumningsradius [ <img fo:content-width="1in" src="files/ftp_upload/51389/51389eq1.jpg" width="113" /> , Der producerer meget stabile grænseflader på mikrofluidenheder dimensioner. De mikro-søjler effektivt forankre vand maske på plads. Vand maske dannelse er drevet af fordampning fra microfluidic havne med den steg med opvarmning. Ved hjælp af varmen fra lav forstørrelse (4x - 10x) mikrosk...

Watch this Scientific Journal Video about Preparation of Neuronal Co-cultures with Single Cell Precision at JoVE.com

Preparation of Neuronal Co-cultures with Single Cell Precision

Protokoller for enkelt neuron mikrofluid opstillingsindretningen og vand maskering for i chippen plasma mønstret af biomateriale belægninger beskrives. Stærkt sammenkoblede co-kulturer kan fremstilles ved anvendelse minimal celle indgange.

Udarbejdelse af neuronale Co-kulturer med Single Cell Precision

Microfluidic embodiments of the Campenot chamber have attracted great interest from the neuroscience community. These interconnected co-culture platforms ...

preparation-of-neuronal-co-cultures-with-single-cell-precision

Research

JoVE Journal

Neuroscience

Single Cell Measurement of Dopamine Release with Simultaneous Voltage-clamp and Amperometry

After its release into the synaptic cleft, dopamine exerts its biological properties via its pre- and post-synaptic targets1. The dopamine signal is terminated by diffusion2-3, extracellular enzymes4, and membrane transporters5. The dopamine transporter, located in the peri-synaptic cleft of dopamine neurons clears the released amines through an inward dopamine flux (uptake). The dopamine transporter can also work in reverse direction to release amines from inside to outside in a process called outward transport or efflux of dopamine5. More than 20 years ago Sulzer et al. reported the dopamine transporter can operate in two modes of activity: forward (uptake) and reverse (efflux)5. The neurotransmitter released via efflux through the transporter can move a large amount of dopamine to the extracellular space, and has been shown to play a major regulatory role in extracellular dopamine homeostasis6. Here we describe how simultaneous patch clamp and amperometry recording can be used to measure released dopamine via the efflux mechanism with millisecond time resolution when the membrane potential is controlled. For this, whole-cell current and oxidative (amperometric) signals are measured simultaneously using an Axopatch 200B amplifier (Molecular Devices, with a low-pass Bessel filter set at 1,000 Hz for whole-cell current recording). For amperometry recording a carbon fiber electrode is connected to a second amplifier (Axopatch 200B) and is placed adjacent to the plasma membrane and held at +700 mV. The whole-cell and oxidative (amperometric) currents can be recorded and the current-voltage relationship can be generated using a voltage step protocol. Unlike the usual amperometric calibration, which requires conversion to concentration, the current is reported directly without considering the effective volume7. Thus, the resulting data represent a lower limit to dopamine efflux because some transmitter is lost to the bulk solution.

The amperometric technique measures dopamine release from a single cell by detecting the oxidative current produced by spontaneous dopamine oxidization. Simultaneous voltage clamp and amperometry methodology reveal the mechanistic relationship between the overall "activity" of dopamine transporter and the regulatory role of this activity on the reverse transport of dopamine.

After its release into the synaptic cleft, dopamine exerts its biological properties via its pre- and post-synaptic targets1. The dopamine signal is ...

Optical Recording of Suprathreshold Neural Activity with Single-cell and Single-spike Resolution

Signaling of information in the vertebrate central nervous system is often carried by populations of neurons rather than individual neurons. Also propagation of suprathreshold spiking activity involves populations of neurons. Empirical studies addressing cortical function directly thus require recordings from populations of neurons with high resolution. Here we describe an optical method and a deconvolution algorithm to record neural activity from up to 100 neurons with single-cell and single-spike resolution. This method relies on detection of the transient increases in intracellular somatic calcium concentration associated with suprathreshold electrical spikes (action potentials) in cortical neurons. High temporal resolution of the optical recordings is achieved by a fast random-access scanning technique using acousto-optical deflectors (AODs)1. Two-photon excitation of the calcium-sensitive dye results in high spatial resolution in opaque brain tissue2. Reconstruction of spikes from the fluorescence calcium recordings is achieved by a maximum-likelihood method. Simultaneous electrophysiological and optical recordings indicate that our method reliably detects spikes (&gt;97% spike detection efficiency), has a low rate of false positive spike detection (&lt; 0.003 spikes/sec), and a high temporal precision (about 3 msec) 3. This optical method of spike detection can be used to record neural activity in vitro and in anesthetized animals in vivo3,4.

Understanding the function of the vertebrate central nervous system requires recordings from many neurons because cortical function arises on the level of populations of neurons. Here we describe an optical method to record suprathreshold neural activity with single-cell and single-spike resolution, dithered random-access scanning. This method records somatic fluorescence calcium signals from up to 100 neurons with high temporal resolution. A maximum-likelihood algorithm deconvolves the underlying suprathreshold neural activity from the somatic fluorescence calcium signals. This method reliably detects spikes with high detection efficiency and a low rate of false positives and can be used to study neural populations in vitro and in vivo.

Optisk registrering af suprathreshold neurale aktivitet med enkelt-celle-og single-spike opløsning

Signaling of information in the vertebrate central nervous system is often carried by populations of neurons rather than individual neurons. Also ...

Simultaneous Pre- and Post-synaptic Electrophysiological Recording from Xenopus Nerve-muscle Co-cultures

Much information about the coupling of presynaptic ionic currents with the release of neurotransmitter has been obtained from invertebrate preparations, most notably the squid giant synapse1. However, except for the preparation described here, few vertebrate preparations exist in which it is possible to make simultaneous measurements of neurotransmitter release and presynaptic ionic currents. Embryonic Xenopus motoneurons and muscle cells can be grown together in simple culture medium at room temperature; they will form functional synapses within twelve to twenty-four hours, and can be used to study nerve and muscle cell development and synaptic interactions for several days (until overgrowth occurs). Some advantages of these co-cultures over other vertebrate preparations include the simplicity of preparation, the ability to maintain the cultures and work at room temperature, and the ready accessibility of the synapses formed2-4. The preparation has been used widely to study the biophysical properties of presynaptic ion channels and the regulation of transmitter release5-8. In addition, the preparation has lent itself to other uses including the study of neurite outgrowth and synaptogenesis9-12, molecular mechanisms of neurotransmitter release13-15, the role of diffusible messengers in neuromodulation16,17, and in vitro synaptic plasticity18-19.

Simultaneous Pre- and Post-synaptic Electrophysiological Recording from Xenopus Nerve-muscle Co-cultures

This video demonstrates the procedures used to grow primary cultures of embryonic Xenopus nerve and muscle cells and the usefulness of this preparation for making simultaneous pre- and post-synaptic patch clamp recordings.

Samtidig Pre-og Post-synaptiske Elektrofysiologiske Optagelse fra<em&gt; Xenopus</em&gt; Nerve-muskel Co-kulturer

Much information about the coupling of  presynaptic ionic currents with the release of neurotransmitter has been obtained  from invertebrate preparations, ...

A Procedure for Implanting Organized Arrays of Microwires for Single-unit Recordings in Awake, Behaving Animals

In vivo electrophysiological recordings in the awake, behaving animal provide a powerful method for understanding neural signaling at the single-cell level. The technique allows experimenters to examine temporally and regionally specific firing patterns in order to correlate recorded action potentials with ongoing behavior. Moreover, single-unit recordings can be combined with a plethora of other techniques in order to produce comprehensive explanations of neural function. In this article, we describe the anesthesia and preparation for microwire implantation. Subsequently, we enumerate the necessary equipment and surgical steps to accurately insert a microwire array into a target structure. Lastly, we briefly describe the equipment used to record from each individual electrode in the array. The fixed microwire arrays described are well-suited for chronic implantation and allow for longitudinal recordings of neural data in almost any behavioral preparation. We discuss tracing electrode tracks to triangulate microwire positions as well as ways to combine microwire implantation with immunohistochemical techniques in order to increase the anatomical specificity of recorded results.

Implanting organized arrays of microwires for use in single-unit electrophysiological recordings presents a number of technical challenges.&#160;Methods for performing this technique and the equipment necessary are described.&#160;Also, the beneficial use of organized microwire arrays to record from distinct neural subregions with high spatial selectivity is discussed.

A Procedure til implantering Organized Arrays af Microwires for Single-unit optagelser i Vågn op, fungerende dyr

In vivo electrophysiological recordings in the awake, behaving animal provide a powerful method for understanding neural signaling at the single-cell ...

Inducing Plasticity of Astrocytic Receptors by Manipulation of Neuronal Firing Rates

Close to two decades of research has established that astrocytes in situ and in vivo express numerous G protein-coupled receptors (GPCRs) that can be stimulated by neuronally-released transmitter. However, the ability of astrocytic receptors to exhibit plasticity in response to changes in neuronal activity has received little attention. Here we describe a model system that can be used to globally scale up or down astrocytic group I metabotropic glutamate receptors (mGluRs) in acute brain slices. Included are methods on how to prepare parasagittal hippocampal slices, construct chambers suitable for long-term slice incubation, bidirectionally manipulate neuronal action potential frequency, load astrocytes and astrocyte processes with fluorescent Ca2+ indicator, and measure changes in astrocytic Gq GPCR activity by recording spontaneous and evoked astrocyte Ca2+ events using confocal microscopy. In essence, a &#8220;calcium roadmap&#8221; is provided for how to measure plasticity of astrocytic Gq GPCRs. Applications of the technique for study of astrocytes are discussed. Having an understanding of how astrocytic receptor signaling is affected by changes in neuronal activity has important implications for both normal synaptic function as well as processes underlying neurological disorders and neurodegenerative disease.

Here we describe an adaptation of protocols used to induce homeostatic plasticity in neurons for the study of plasticity of astrocytic G protein-coupled receptors. Recently used to examine changes in astrocytic group I mGluRs in juvenile mice, the method can be applied to measure scaling of various astrocytic GPCRs, in tissue from adult mice in situ and in vivo, and to gain a better appreciation of the sensitivity of astrocytic receptors to changes in neuronal activity.

Inducerende plasticitet astrocytisk receptorer ved manipulation af neuronfyring priser

Close to two decades of research has established that astrocytes in situ and in vivo express numerous G protein-coupled receptors (GPCRs) that can be ...

Investigating Functional Regeneration in Organotypic Spinal Cord Co-cultures Grown on Multi-electrode Arrays

Adult higher vertebrates have a limited potential to recover from spinal cord injury. Recently, evidence emerged that propriospinal connections are a promising target for intervention to improve functional regeneration. So far, no in vitro model exists that grants the possibility to examine functional recovery of propriospinal fibers. Therefore, a representative model that is based on two organotypic spinal cord sections of embryonic rat, cultured next to each other on multi-electrode arrays (MEAs) was developed. These slices grow and, within a few days in vitro, fuse along the sides facing each other. The design of the used MEAs permits the performance of lesions with a scalpel blade through this fusion site without inflicting damage on the MEAs. The slices show spontaneous activity, usually organized in network activity bursts, and spatial and temporal activity parameters such as the location of burst origins, speed and direction of their propagation and latencies between bursts can be characterized. Using these features, it is also possible to assess functional connection of the slices by calculating the amount of synchronized bursts between the two sides. Furthermore, the slices can be morphologically analyzed by performing immunohistochemical stainings after the recordings. 
Several advantages of the used techniques are combined in this model: the slices largely preserve the original tissue architecture with intact local synaptic circuitry, the tissue is easily and repeatedly accessible and neuronal activity can be detected simultaneously and non-invasively in a large number of spots at high temporal resolution. These features allow the investigation of functional regeneration of intraspinal connections in isolation in vitro in a sophisticated and efficient way.

Here we present a protocol that is based on spinal cord slices cultured on multi-electrode arrays to study functional regeneration of propriospinal connections in vitro.

Undersøgelse Funktionel Regenerering i Organotypiske Spinal Cord Co-kulturer dyrket på Multi-elektrode Arrays

Adult higher vertebrates have a limited potential to recover from spinal cord injury. Recently, evidence emerged that propriospinal connections are a ...

Extracellular Recording of Neuronal Activity Combined with Microiontophoretic Application of Neuroactive Substances in Awake Mice

Differences in the activity of neurotransmitters and neuromodulators, and consequently different neural responses, can be found between anesthetized and awake animals. Therefore, methods allowing the manipulation of synaptic systems in awake animals are required in order to determine the contribution of synaptic inputs to neuronal processing unaffected by anesthetics. Here, we present methodology for the construction of electrodes to simultaneously record extracellular neural activity and release multiple neuroactive substances at the vicinity of the recording sites in awake mice. By combining these procedures, we performed microiontophoretic injections of gabazine to selectively block GABAA receptors in neurons of the inferior colliculus of head-restrained mice. Gabazine successfully modified neural response properties such as the frequency response area and stimulus-specific adaptation. Thus, we demonstrate that our methods are suitable for recording single-unit activity and for dissecting the role of specific neurotransmitter receptors in auditory processing.
The main limitation of the described procedure is the relatively short recording time (~3 hr), which is determined by the level of habituation of the animal to the recording sessions. On the other hand, multiple recording sessions can be performed in the same animal. The advantage of this technique over other experimental procedures used to manipulate the level of neurotransmission or neuromodulation (such as systemic injections or the use of optogenetic models), is that the drug effect is confined to the local synaptic inputs to the target neuron. In addition, the custom-manufacture of electrodes allows adjustment of specific parameters according to the neural structure and type of neuron of interest (such as the tip resistance for improving the signal-to-noise ratio of the recordings).

We present methods for the construction of electrodes to simultaneously record extracellular neural activity and release multiple neuroactive substances at the vicinity of the recording sites in awake mice. This technique allows the detailed analysis of putative local synaptic inputs to the neuron of interest.

Ekstracellulær Registrering af neuronal aktivitet Kombineret med Microiontophoretic Anvendelse af Neuroaktive stoffer i Awake mus

Differences in the activity of neurotransmitters and neuromodulators, and consequently different neural responses, can be found between anesthetized and ...

In Utero Electroporation Approaches to Study the Excitability of Neuronal Subpopulations and Single-cell Connectivity

The nervous system is composed of an enormous range of distinct neuronal types. These neuronal subpopulations are characterized by, among other features, their distinct dendritic morphologies, their specific patterns of axonal connectivity, and their selective firing responses. The molecular and cellular mechanisms responsible for these aspects of differentiation during development are still poorly understood.
Here, we describe combined protocols for labeling and characterizing the structural connectivity and excitability of cortical neurons. Modification of the in utero electroporation (IUE) protocol allows the labeling of a sparse population of neurons. This, in turn, enables the identification and tracking of the dendrites and axons of individual neurons, the precise characterization of the laminar location of axonal projections, and morphometric analysis. IUE can also be used to investigate changes in the excitability of wild-type (WT) or genetically modified neurons by combining it with whole-cell recording from acute slices of electroporated brains. These two techniques contribute to a better understanding of the coupling of structural and functional connectivity and of the molecular mechanisms controlling neuronal diversity during development. These developmental processes have important implications on axonal wiring, the functional diversity of neurons, and the biology of cognitive disorders.

In Utero Electroporation Approaches to Study the Excitability of Neuronal Subpopulations and Single-cell Connectivity

This manuscript provides protocols that use in utero electroporation (IUE) to describe the structural connectivity of neurons at the single-cell level and the excitability of fluorescently labeled neurons. Histology is used to characterize dendritic and axonal projections. Whole-cell recording in acute slices is used to investigate excitability.

I Utero Elektroporation Approaches to Undersøgelse ophidselse af neuronale subpopulationer og Single-celle Connectivity

The nervous system is composed of an enormous range of distinct neuronal types. These neuronal subpopulations are characterized by, among other features, ...

Neuron-Macrophage Co-cultures to Activate Macrophages Secreting Molecular Factors with Neurite Outgrowth Activity

There is strong evidence that macrophages can participate in the regeneration or repair of injured nervous system. Here, we describe a protocol in which macrophages are induced to produce conditioned medium (CM) that promotes neurite outgrowth. Adult dorsal root ganglion (DRG) neurons are acutely dissociated and plated. After the neurons are stably attached, peritoneal macrophages are co-cultured on a cell culture insert overlaid on the same well. Dibutyryl cyclic AMP (db-cAMP) is applied to the co-cultures for 24 h, after which the cell culture insert containing the macrophages is moved to another well to collect CM for 72 h. The CM from the co-cultures treated with db-cAMP, when applied to a separate adult DRG neuron culture, exhibits robust neurite outgrowth activity. The CM obtained from the db-cAMP-treated cultures consisting of single cell type alone, either DRG neuron or peritoneal macrophage, did not exhibit neurite outgrowth activity. This indicates that the interaction between neurons and macrophages is indispensable for the activation of macrophages secreting molecular factors with neurite outgrowth activity into CM. Thus, our co-culture paradigm will also be useful to study intercellular signaling in the neuron-macrophage interaction to stimulate the macrophages to be endowed with a pro-regenerative phenotype.

The current protocol presents experimental procedures to stimulate cultured macrophages to be endowed with capacity to release molecular factors that promote neurite outgrowth. Treatment of cAMP to the neuron-macrophage co-cultures induces the macrophages to produce conditioned medium that possesses strong neurite outgrowth activity.

Neuron-makrofag Co kulturer at aktivere makrofager secernerende molekylære faktorer med Neurite udvækst aktivitet

There is strong evidence that macrophages can participate in the regeneration or repair of injured nervous system. Here, we describe a protocol in which ...

GM-Free Generation of Blood-Derived Neuronal Cells

Many human&#160;neurological disorders are caused by degeneration of neurons and glial cells in the brain. Due to limitations in pharmacological and other therapeutic strategies, there is currently no cure available for the injured or diseased brain. Cell replacement appears as a promising therapeutic strategy for neurodegenerative conditions. To this day, neural stem cells (NSCs) have been successfully generated from fetal tissues, human embryonic cells (ES) or induced pluripotent stem cells (iPSC). A process of dedifferentiation was initiated by activation of the novel human GPI-linked glycoprotein, which leads to generation of pluripotent stem cells. These blood-derived pluripotent stem cells (BD-PSCs) differentiate in vitro into cells with a neural phenotype as shown by brightfield and immunofluorescence microscopy. Ultrastructural analysis of these cells by means of electron microscopy confirms their primitive structure as well as neuronal-like morphology and subcellular characteristics.

We present a genetically modified-free (GM-free) method to obtain cells with a neuronal phenotype from reprogrammed peripheral blood cells. Activation of a signaling pathway linked to novel human GPI-linked protein reveals an efficient GM-free method for obtaining human pluripotent stem cells.

GM-fri generation af blod-afledte neuronale celler

Many human&#160;neurological disorders are caused by degeneration of neurons and glial cells in the brain. Due to limitations in pharmacological and other ...