Teknik yardım için Dr Meng-Çene Lin ve Bayan Yuan Dong teşekkür ederim. Bu çalışma Sağlık HD053767 Ulusal Enstitüsü (NLW için fason), bir hibe ile ve California-Los Angeles Araştırma, Üniversitesi (NLW) için Rektör Yardımcısı fizyolojisi ve Office Bölümü&#39;nden fonları tarafından desteklenmiştir.

1. Yetişkin Medaka gelen Brain diseksiyonu <ol><li> Daldırma tarafından (Şekil 1A) kadın ya da erkek yetişkin anestezisi 5 ml MS-222 (150 mg / L, pH 7.4); solungaçları hareketleri decapitating önce durdurdu sonra birkaç dakika bekleyin. Tüm işlemler California-Los Angeles Üniversitesi Kurumsal Hayvan Bakım ve Kullanım Kurulu tarafından onaylanmıştır. </li><li> 60 mm çapında Petri kabındaki makas ile operculum&#39;un kuyruk sonunda balık tuzlu su içinde balık başını kesmek. </li><li> 35 mm çapında Petri kabı transfer balık kafası, yarım tuzlu balık dolu ve beyin diseksiyon için baş konumlandırmak ve korumak için bir depresyon vardır Sylgard ile kaplı. Konum ve böcek işaretçilerine ile baş dorsal tarafı yukarı sabitleyin. </li><li> Dikkatlice ince makas ile çevresinde kafatasının dorsal kısmı kesilmiş ve hafifçe tamamen omuriliğin ön kısmı dahil olmak üzere beynin dorsal kısmı açığa forseps ile çıkarın. </li> &lt;li&gt; ince ucu forseps ile yavaşça omurilik kaldırın ve ince uçlu makas ile ikili bağ sinirler sever: beynin ventral tarafta kranial sinirler, spinal sinirler ve optik sinirler ve ön kısmında koku sinirlerinin beyin. </li><li> Balık tuzlu su ile dolu yeni bir Petri kabındaki tamamen disseke beyin yerleştirin ve tüm beyin herhangi bir kesik veya delikler olmadan (hipofiz bezi dahil) sağlam olduğundan emin olmak için mikroskop altında dikkatle kontrol edin. Hasarlı beyinleri deney için kullanılmaz. </li></ol> 2. Bir Kayıt Odası Beyin Montaj <ol><li> Siyanoakrilat küçük bir damla ya da kayıt odasının merkezine bir iğne ile diğer bazı hızlı etkili tutkal yerleştirin ve 1 cm yaklaşık 2 tutkal yayıldı. </li><li> Hızlı bir ventral tarafı yukarı konumda beyin ve tutkal aşağı aktarın. </li><li> Bu kayıt gözü doldurur ve beyin kapsar, böylece balık 1 ml tuzlu su ekleyin. Sürekli serpmeken az 200 ul / dak &#39;lık bir hızda tuzlu su ile gazlı balık beyin. </li><li> Ince ucu kullanılarak dikkatlice beyin kayıt alanının yüzeyi üzerinde zarları forseps çıkarın. </li></ol> 3. Elektrofizyoloji <ol><li> Aksiyon potansiyeli ateşleme gevşek yama kayıt <ol><li> Cam Mikroelektronlar (M 6-10) bir elektrot çektirmesi (örneğin Sutter P-87) ile borosilikat cam pipetler (1B150F-4, Dünya Hassas Aletler) inşa ve geri yarım yukarı gevşek yama kayıt çözümü ile doldurulur elektrot. </li><li> Bir soğutmalı şarj bağlı cihaz (CCD) kamera ile dik bir floresan mikroskop kullanılarak, GFP-ifade 10x ile TN-GnRH3 nöronlar (Şekil 1B), sonra 40x suya daldırma hedefleri (Şekil 1C) bulabilirsiniz. Onlar telencephalon sadece ön koku ampuller, en ventral yüzeyinde veya yakınında bulunmaktadır. </li><li> Sağlayan bir video monitörü geçinmikroskop gerçek zamanlı görüntü TN-GnRH3 nöron kümesi (Şekil 1C) bulmak için. </li><li> Elektrot ucu nöron hedefin üzerinde olduğunu, banyo içine mikroelektrot yerleştirin. Bu hale tıkanmış ve yavaşça elektrot ucu ile hedef nöron yaklaşım değildir böylece mikroelektrot sürekli hafif pozitif basınç uygulayın. </li><li> AxoGraph yazılım ve Axograph yazılım (Axon Instruments) ile amplifikatör Axoclamp 200B kullanarak gerilim-kelepçe modunda elektrot direnci kontrol edin ve izleyin. Eğer elektrot ucu nöron yüzeyinde ve direnç biraz değiştirir AxoGraph ekrandan olduğunu video monitörden görebilirsiniz zaman, düşük bir direnç mühür yapmak için pozitif basınç serbest ve gerekirse hafif negatif basınç uygulayın nöron (&lt;100 MQ). </li><li> Akım kelepçe moduna geçin ve ölçek ayarlayarak, herhangi bir akım girişi olmadan sürekli membran gerilimi kayıtGerilim ve kayıt gerektiğinde oranının. Veri Powerlab yazılım (ADInstruments A.Ş.) tarafından toplanan ve analiz edilir. </li><li> Herhangi bir tedavi (Şekil 2A) önce yaklaşık 5 dakika için normal bir balık tuzlu su içinde rekor temel elektriksel aktivite. Ilaçlar, hormonlar, peptidler, vb Bath perfüzyon. Balık bir tuza ilave edilmesi, normal tuzlu su balıkları 5, 6, 11, bir yıkanıp temizlenme süresi ile, ardından 200 ul / dk hızında devam eder. </li></ol></li><li> Membran potansiyeli tüm hücre kayıt 3.1.4 - tüm hücre yama kelepçe elektrofizyolojik işlem adımları 3.1.1, yukarıda tarif edilen hücre-dışı gevşek yama kayıt prosedürü bu kadar aynıdır. Daha sonra, buna göre usul sapma: <ol><li> Gerilim-kelepçe modunda elektrot direnci kontrol edin ve izleyin. Eğer direnç değişiklikleri biraz, olumlu serbest olduğu elektrot ucu nöron yüzeyinde ve osiloskop ait olduğunu video monitörden görebilirsiniz zamanbasınç ve nöron (~ 3 Giga Ω) bir yüksek direnç mühür yapmak için biraz negatif basınç uygulayın. Rüptürü yamalı membran ağızdan bir negatif basınç uygulayın, siz MQ hakkında 120-250 için direnç ani bir düşüş göreceksiniz. </li><li> Akım kelepçe moduna geçin ve kayıt gerekirse gerilim ve hız ölçeği ayarlama, herhangi bir akım girişi olmadan sürekli membran gerilimi kaydedin. </li><li> Herhangi bir tedaviden önce yaklaşık 5 dakika için normal tuzlu su içinde balık kayıt taban elektriksel aktivite yanı 3.1.7 (Şekil 2B) olarak yukarıda tarif edilmiştir. </li></ol></li></ol>

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	<li>Kah, O., Lethimonier, C., Lareyre, J. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Gonadotrophin-releasing+hormone+(GnRH)+in+the+animal+kingdom.">Gonadotrophin-releasing hormone (GnRH) in the animal kingdom.</a> J. Soc. Biol. 198 (1), 53-60 (2004).</li><li>Ramakrishnan, S., Wayne, N. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Social+cues+from+conspecifics+alter+electrical+activity+of+gonadotropin-releasing+hormone+neurons+in+the+terminal+nerve+via+visual+signals.">Social cues from conspecifics alter electrical activity of gonadotropin-releasing hormone neurons in the terminal nerve via visual signals.</a> Am. J. Physiol. Regul. Integr. Comp. Physiol. 297 (1), R135-R141 (2009).</li><li>Abe, H., Oka, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mechanisms+of+neuromodulation+by+a+nonhypophysiotropic+GnRH+system+controlling+motivation+of+reproductive+behavior+in+the+teleost.">Mechanisms of neuromodulation by a nonhypophysiotropic GnRH system controlling motivation of reproductive behavior in the teleost.</a> 57 (6), 665-674 (2011).</li><li>Oka, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tetrodotoxin-resistant+persistent+Na++current+underlying+pacemaker+potentials+of+fish+gonadotrophin-releasing+hormone+neurones.">Tetrodotoxin-resistant persistent Na+ current underlying pacemaker potentials of fish gonadotrophin-releasing hormone neurones.</a> J. Physiol. 482 (Pt. 1), 1-6 (1995).</li><li>Zhao, Y., Wayne, N. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effects+of+Kisspeptin1+on+Electrical+Activity+of+an+Extrahypothalamic+Population+of+Gonadotropin-Releasing+Hormone+Neurons+in+Medaka.">Effects of Kisspeptin1 on Electrical Activity of an Extrahypothalamic Population of Gonadotropin-Releasing Hormone Neurons in Medaka.</a> PLoS One. 7 (5), e37909 (2012).</li><li>Wayne, N. L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Whole-cell+electrophysiology+of+gonadotropin-releasing+hormone+neurons+that+express+green+fluorescent+protein+in+the+terminal+nerve+of+transgenic+medaka+(Oryzias+latipes).">Whole-cell electrophysiology of gonadotropin-releasing hormone neurons that express green fluorescent protein in the terminal nerve of transgenic medaka (Oryzias latipes).</a> Biol. 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Yazarlar ifşa hiçbir şey yok.

GnRH 3: GFP transgenik balıklar nöronal entegrasyon ve doğrudan ve dolaylı olarak üreme 3, 8-10 dahil her ikisi de davranışları merkezi kontrol düzenleme altında yatan nörofizyolojik mekanizmaları incelemek için benzersiz modelleri sağlar. Bu model sisteminin önemli avantajlarından biri, GFP ifade eden birçok GnRH3 nöronların sinir devreleri 6, 9, 11, 12 (Şekil bozmadan elektrofizyolojik kayıt için nöronlara nispeten kolay erişim sağlayan, beyin ve...

<table border="1">
 <tbody>
 <tr>
 <td>Name</td>
 <td>Company</td>
 <td>Catalog Number</td>
 <td>Comments</td>
 </tr>
 <tr>
 <td>Microscope</td>
 <td>Olympus</td>
 <td></td>
 <td>BX50W (Upright)</td>
 </tr>
 <tr>
 <td>Amplifier</td>
 <td>Axon Instruments</td>
 <td></td>
 <td>Axoclamp 200B </td>
 </tr>
 <tr>
 <td>A-D converter</td>
 <td>Computer Interference Corp.</td>
 <td></td>
 <td>Digidata ITC-18 </td>
 </tr>
 <tr>
 <td>Cooled CCD camera</td>
 <td>PCO Computer Optics </td>
 <td></td>
 <td>Sensicam</td>
 </tr>
 <tr>
 <td>Xenon lamp</td>
 <td>Sutter Instruments Co.</td>
 <td></td>
 <td></td>
 </tr>
 <tr>
 <td>GFP filter set</td>
 <td>Chroma Technologies</td>
 <td></td>
 <td></td>
 </tr>
 <tr>
 <td>Imaging Software</td>
 <td>Intelligent Imaging Innovations</td>
 <td></td>
 <td>Slidebook software </td>
 </tr>
 <tr>
 <td>Electrophysiology Data Acquisition Software</td>
 <td>Axon Instruments</td>
 <td></td>
 <td>Axograph software </td>
 </tr>
 <tr>
 <td>Electrophysiology Data Acquisition Software</td>
 <td>AD Instruments Inc.</td>
 <td></td>
 <td>PowerLab </td>
 </tr>
 <tr>
 <td>Headstage for electrophysiology</td>
 <td>Axon Instruments</td>
 <td></td>
 <td>CV 203BU </td>
 </tr>
 <tr>
 <td>Micromanipulator</td>
 <td>Sutter Instrument Co </td>
 <td>MP-285 </td>
 <td></td>
 </tr>
 <tr>
 <td>Recording Chamber Platform</td>
 <td>Warner Instrument Corp.</td>
 <td></td>
 <td>P1 </td>
 </tr>
 <tr>
 <td>Recording Chamber</td>
 <td>Warner Instrument Corp.</td>
 <td></td>
 <td>RC-26G </td>
 </tr>
 <tr>
 <td>Electrode Puller</td>
 <td>Sutter instruments</td>
 <td></td>
 <td>P87 </td>
 </tr>
 <tr>
 <td>Filament for electrode puller</td>
 <td>Sutter Instruments</td>
 <td>FB330B</td>
 <td>3.0 mm wide trough filament</td>
 </tr>
 <tr>
 <td>1.5 mm glass capillaries</td>
 <td>World Precision Instruments</td>
 <td>1B150-4</td>
 <td>Microelectrode for recording</td>
 </tr>
 <tr>
 <td>Syringe</td>
 <td>Becton Dickinson</td>
 <td>309586</td>
 <td>3 ml</td>
 </tr>
 <tr>
 <td>MS-222 </td>
 <td>Sigma</td>
 <td>E10521-10G</td>
 <td>Ethyl 3-aminobenzoate methanesulfonate salt</td>
 </tr>
 <tr>
 <td>Fish saline</td>
 <td></td>
 <td></td>
 <td>mM: 134 NaCl; 2.9 KCl; 2.1 CaCl2; 1.2 MgCl2; 10 HEPES </td>
 </tr>
 <tr>
 <td>Electrode solution (loose-patch) </td>
 <td></td>
 <td></td>
 <td>mM: 150 NaCl; 3.5 KCl; 2.5 CaCl2; 1.3 MgCl2; 10 HEPES; 10 glucose </td>
 </tr>
 <tr>
 <td>Electrode solution (whole-cell patch) </td>
 <td></td>
 <td></td>
 <td>mM: 112.5 K-gluconate; NaCl; 17.5 KCl; 0.5 CaCl2; 1 MgCl2; 5 MgATP; 1 EGTA; 10 HEPES; 1 GTP; 0.1 leupeptin;10 phospho-creatine </td>
 </tr>
 </tbody>
</table>

recording electrical activity from identified neurons in the intact brain of transgenic fish

Karmaşık davranışlar düzenleyen nöral devrelerin hücre fizyolojisi anlayışı bu iş CNS sinir devresi bozulmadan kalır sağlam bir beyin hazırlanmasında yapılabilir hangi model sistemler kullanılarak büyük ölçüde geliştirilmiştir. Biz gonadotropin salgılatıcı hormon (GnRH) nöronlar genetik sağlam beyinde tanımlanması için yeşil flüoresan protein ile etiketlenmiş edildiği transgenik balık kullanabilirsiniz. Balık GnRH nöron birden fazla nüfusa sahip ve işlevleri onların beyindeki yeri ve 1 ifade ettiği GnRH gen bağlıdır. Biz transgenik Medaka balık bozulmamış beyin (Şekil 1B ve C) kullanarak koku ampuller ile ilişkili terminal sinirler (TN) bulunan GnRH3 nöronlar bizim gösteri odaklanmıştır. Çalışmalar Medaka TN-GnRH3 nöronlar merkezi sinir sistemi ile dış çevreden bir bilgi verici olarak hareket eden, nöromodülatör olduğunu göstermektedir; they gibi tanınmış hipotalamik GnRH1 nöronlar 2, 3 yapmak. TN-GnRH3 nöronların spontan aksiyon potansiyeli ateşleme tonik desen içsel bir özellik 4-6, frekans, hipofiz-gonadal fonksiyonları düzenleyen doğrudan bir rol oynamaz hangi conspecifics 2 ve nöropeptid kisspeptin 1 5 ila görsel ipuçları ile modüle edilir. Bu video, TN-GnRH3 nöronların nasıl nöronlar belirlemek ve tüm beyin kendi elektriksel aktivite izlemek için size göstermek için gelişmiş yeşil flüoresan protein 7 bağlantılı Gnrh3 promotor bölgesinde içeren bir transgen ifade edildiği transgenik Medaka istikrarlı bir satırını kullanın Hazırlık 6.

Medaka balık Kesilerek çıkarılan beynin GFP-etiketli TN-GnRH3 nöronların ikili kümelerinin bir örneği Şekiller 1B ve 1C &#39;de gösterilmiştir. Her küme 8-10 GnRH nöronları içerir. Hedef TN-GnRH3 kendiliğinden nöronal aktiviteleri 0.5-6 Hz tipik ateş oranları ile akım kelepçe modu (I = 0) kaydedildi. Aksiyon potansiyeli ateşleme paterni oldukça düzenli interspike aralığı ile, tipik bir tonik veya dayak kalıptır. Örnek izleri Şekil 2 (:;: ...

Watch this Scientific Journal Video about Recording Electrical Activity from Identified Neurons in the Intact Brain of Transgenic Fish at JoVE.com

Recording Electrical Activity from Identified Neurons in the Intact Brain of Transgenic Fish

Bu video, karmaşık nöral devreleri koruyan bir bütün beyin hazırlık, belirlenen tek nöronlardan elektriksel aktivite kayıt nasıl gösterecektir. Biz gonadotropin salgılatıcı hormon (GnRH) nöronlar genetik sağlam beyin hazırlanmasında tanımlama için bir floresan protein ile etiketlenmiş edildiği transgenik balık kullanabilirsiniz.

Transgenik Balık Sağlam Beyin Tespit Edilen nöronlar Elektrik Aktivitesi Kayıt

Understanding the cell physiology of neural circuits that regulate complex behaviors is greatly enhanced by using model systems in which this work can be ...

recording-electrical-activity-from-identified-neurons-intact-brain

Research

JoVE Journal

Neuroscience

13.4K Görüntüleme.  University of California, Los Angeles. Bu video, karmaşık nöral devreleri koruyan bir bütün beyin hazırlık, belirlenen tek nöronlardan elektriksel aktivite kayıt nasıl gösterecektir. Biz gonadotropin salgılatıcı hormon (GnRH) nöronlar genetik sağlam beyin hazırlanmasında tanımlama için bir floresan protein ile etiketlenmiş edildiği transgenik balık kullanabilirsiniz.

Video: Recording Electrical Activity from Identified Neurons in the Intact Brain of Transgenic Fish

Simultaneous Recording of Calcium Signals from Identified Neurons and Feeding Behavior of Drosophila melanogaster

To study neuronal networks in terms of their function in behavior, we must analyze how neurons operate when each behavioral pattern is generated. Thus, simultaneous recordings of neuronal activity and behavior are essential to correlate brain activity to behavior. For such behavioral analyses, the fruit fly, Drosophila melanogaster, allows us to incorporate genetically encoded calcium indicators such as GCaMP1, to monitor neuronal activity, and to use sophisticated genetic manipulations for optogenetic or thermogenetic techniques to specifically activate identified neurons2-5. Use of a thermogenetic technique has led us to find critical neurons for feeding behavior (Flood et al., under revision). As a main part of feeding behavior, a Drosophila adult extends its proboscis for feeding6 (proboscis extension response; PER), responding to a sweet stimulus from sensory cells on its proboscis or tarsi. Combining the protocol for PER7 with a calcium imaging technique8 using GCaMP3.01, 9, I have established an experimental system, where we can monitor activity of neurons in the feeding center &#x2013; the suboesophageal ganglion (SOG), simultaneously with behavioral observation of the proboscis. I have designed an apparatus ("Fly brain Live Imaging and Electrophysiology Stage": "FLIES") to accommodate a Drosophila adult, allowing its proboscis to freely move while its brain is exposed to the bath for Ca2+ imaging through a water immersion lens. The FLIES is also appropriate for many types of live experiments on fly brains such as electrophysiological recording or time lapse imaging of synaptic morphology. Because the results from live imaging can be directly correlated with the simultaneous PER behavior, this methodology can provide an excellent experimental system to study information processing of neuronal networks, and how this cellular activity is coupled to plastic processes and memory.

Simultaneous Recording of Calcium Signals from Identified Neurons and Feeding Behavior of Drosophila melanogaster

The fruit fly, Drosophila melanogaster, extends its proboscis for feeding, responding to a sugar stimulus from its proboscis or tarsus. I have combined observations of the proboscis extension response (PER) with a calcium imaging technique, allowing us to monitor the activity of neurons in the brain, simultaneously with behavioral observation.

Belirlenen Nöronlar ve Beslenme Davranışı Kalsiyum sinyaller aynı anda kayıt Drosophila melanogaster</em

To study neuronal networks in terms of their function in behavior, we must analyze how neurons operate when each behavioral pattern is generated.  Thus, ...

Nörobilim

Retrograde Fluorescent Labeling Allows for Targeted Extracellular Single-unit Recording from Identified Neurons In vivo

The overall goal of this method is to record single-unit responses from an identified population of neurons. In vivo electrophysiological recordings from individual neurons are critical for understanding how neural circuits function under natural conditions. Traditionally, these recordings have been performed 'blind', meaning the identity of the recorded cell is unknown at the start of the recording. Cellular identity can be subsequently determined via intracellular1, juxtacellular2 or loose-patch3 iontophoresis of dye, but these recordings cannot be pre-targeted to specific neurons in regions with functionally heterogeneous cell types. Fluorescent proteins can be expressed in a cell-type specific manner permitting visually-guided single-cell electrophysiology4-6. However, there are many model systems for which these genetic tools are not available. Even in genetically accessible model systems, the desired promoter may be unknown or genetically homogenous neurons may have varying projection patterns. Similarly, viral vectors have been used to label specific subgroups of projection neurons7, but use of this method is limited by toxicity and lack of trans-synaptic specificity. Thus, additional techniques that offer specific pre-visualization to record from identified single neurons in vivo are needed. Pre-visualization of the target neuron is particularly useful for challenging recording conditions, for which classical single-cell recordings are often prohibitively difficult8-11. The novel technique described in this paper uses retrograde transport of a fluorescent dye applied using tungsten needles to rapidly and selectively label a specific subset of cells within a particular brain region based on their unique axonal projections, thereby providing a visual cue to obtain targeted electrophysiological recordings from identified neurons in an intact circuit within a vertebrate CNS.
The most significant novel advancement of our method is the use of fluorescent labeling to target specific cell types in a non-genetically accessible model system. Weakly electric fish are an excellent model system for studying neural circuits in awake, behaving animals12. We utilized this technique to study sensory processing by "small cells" in the anterior exterolateral nucleus (ELa) of weakly electric mormyrid fish. "Small cells" are hypothesized to be time comparator neurons important for detecting submillisecond differences in the arrival times of presynaptic spikes13. However, anatomical features such as dense myelin, engulfing synapses, and small cell bodies have made it extremely difficult to record from these cells using traditional methods11, 14. Here we demonstrate that our novel method selectively labels these cells in 28% of preparations, allowing for reliable, robust recordings and characterization of responses to electrosensory stimulation.

Retrograde Fluorescent Labeling Allows for Targeted Extracellular Single-unit Recording from Identified Neurons In vivo

Retrograde transport of fluorescent dye labels a sub-population of neurons based on anatomical projection. Labeled axons can be visually targeted in vivo, permitting extracellular recording from identified axons. This technique facilitates recording when neurons cannot be labeled through genetic manipulation or are difficult to isolate using 'blind' in vivo approaches.

Retrograd Floresan Etiketleme Belirlenen Nöronlar gelen Hedefli Hücre dışı Tek ünitesi Kayıt izin verir<em&gt; In vivo</em

The overall goal of this method is to record single-unit responses from an identified population of neurons. In vivo electrophysiological recordings from ...

Intracellular Recording, Sensory Field Mapping, and Culturing Identified Neurons in the Leech, Hirudo medicinalis

The freshwater leech, Hirudo medicinalis, is a versatile model organism that has been used to address scientific questions in the fields of neurophysiology, neuroethology, and developmental biology. The goal of this report is to consolidate experimental techniques from the leech system into a single article that will be of use to physiologists with expertise in other nervous system preparations, or to biology students with little or no electrophysiology experience. We demonstrate how to dissect the leech for recording intracellularly from identified neural circuits in the ganglion. Next we show how individual cells of known function can be removed from the ganglion to be cultured in a Petri dish, and how to record from those neurons in culture. Then we demonstrate how to prepare a patch of innervated skin to be used for mapping sensory or motor fields. These leech preparations are still widely used to address basic electrical properties of neural networks, behavior, synaptogenesis, and development. They are also an appropriate training module for neuroscience or physiology teaching laboratories.

Intracellular Recording, Sensory Field Mapping, and Culturing Identified Neurons in the Leech, Hirudo medicinalis

This article describes three nervous system preparations using leeches: intracellular recording from neurons in ventral ganglia, culturing neurons from ventral ganglia, and recording from a patch of innervated skin to map sensory fields.

Hücre içi Kaydı, Duyu Alan Haritalama ve Sülük de Kültüre Belirlenen Nöronlar Hirudo medicinalis</i

The freshwater leech, Hirudo medicinalis, is a versatile model organism that has been used to address scientific questions in the fields of ...

Electrophysiological Recording in the Brain of Intact Adult Zebrafish

Previously, electrophysiological studies in adult zebrafish have been limited to slice preparations or to eye cup preparations and electrorentinogram recordings. This paper describes how an adult zebrafish can be immobilized, intubated, and used for in vivo electrophysiological experiments, allowing recording of neural activity. Immobilization of the adult requires a mechanism to deliver dissolved oxygen to the gills in lieu of buccal and opercular movement. With our technique, animals are immobilized and perfused with habitat water to fulfill this requirement. A craniotomy is performed under tricaine methanesulfonate (MS-222; tricaine) anesthesia to provide access to the brain. The primary electrode is then positioned within the craniotomy window to record extracellular brain activity. Through the use of a multitube perfusion system, a variety of pharmacological compounds can be administered to the adult fish and any alterations in the neural activity can be observed. The methodology not only allows for observations to be made regarding changes in neurological activity, but it also allows for comparisons to be made between larval and adult zebrafish. This gives researchers the ability to identify the alterations in neurological activity due to the introduction of various compounds at different life stages.

This paper describes how an adult zebrafish can be immobilized, intubated, and used for in vivo electrophysiological experiments to allow recordings and manipulation of neural activity in an intact animal.

Sağlam Yetişkin Zebra balığı Beyin Elektrofizyolojik Kayıt

Previously, electrophysiological studies in adult zebrafish have been limited to slice preparations or to eye cup preparations and electrorentinogram ...

A Guide to In vivo Single-unit Recording from Optogenetically Identified Cortical Inhibitory Interneurons

A major challenge in neurophysiology has been to characterize the response properties and function of the numerous inhibitory cell types in the cerebral cortex. We here share our strategy for obtaining stable, well-isolated single-unit recordings from identified inhibitory interneurons in the anesthetized mouse cortex using a method developed by Lima and colleagues1. Recordings are performed in mice expressing Channelrhodopsin-2 (ChR2) in specific neuronal subpopulations. Members of the population are identified by their response to a brief flash of blue light. This technique &#8211; termed &#8220;PINP&#8221;, or Photostimulation-assisted Identification of Neuronal Populations &#8211; can be implemented with standard extracellular recording equipment. It can serve as an inexpensive and accessible alternative to calcium imaging or visually-guided patching, for the purpose of targeting extracellular recordings to genetically-identified cells. Here we provide a set of guidelines for optimizing the method in everyday practice. We refined our strategy specifically for targeting parvalbumin-positive (PV+) cells, but have found that it works for other interneuron types as well, such as somatostatin-expressing (SOM+) and calretinin-expressing (CR+) interneurons.

A Guide to In vivo Single-unit Recording from Optogenetically Identified Cortical Inhibitory Interneurons

Here we describe our strategy for obtaining stable, well-isolated single-unit recordings from identified inhibitory interneurons in the anesthetized mouse cortex. Neurons expressing ChR2 are identified by their response to blue light. The method uses standard extracellular recording equipment, and serves as an inexpensive alternative to calcium imaging or visually-guided patching.

A Guide<em&gt; In vivo</emOptogenetically Belirlenen Kortikal inhibitör dan&gt; Tek birim Kayıt

A major challenge in neurophysiology has been to characterize the response properties and function of the numerous inhibitory cell types in the cerebral ...

Perforated Patch-clamp Recording of Mouse Olfactory Sensory Neurons in Intact Neuroepithelium: Functional Analysis of Neurons Expressing an Identified Odorant Receptor

Analyzing the physiological responses of olfactory sensory neurons (OSN) when stimulated with specific ligands is critical to understand the basis of olfactory-driven behaviors and their modulation. These coding properties depend heavily on the initial interaction between odor molecules and the olfactory receptor (OR) expressed in the OSNs. The identity, specificity and ligand spectrum of the expressed OR are critical. The probability to find the ligand of the OR expressed in an OSN chosen randomly within the epithelium is very low. To address this challenge, this protocol uses genetically tagged mice expressing the fluorescent protein GFP under the control of the promoter of defined ORs. OSNs are located in a tight and organized epithelium lining the nasal cavity, with neighboring cells influencing their maturation and function. Here we describe a method to isolate an intact olfactory epithelium and record through patch-clamp recordings the properties of OSNs expressing defined odorant receptors. The protocol allows one to characterize OSN membrane properties while keeping the influence of the neighboring tissue. Analysis of patch-clamp results yields&#160;a precise quantification of ligand/OR interactions, transduction pathways and pharmacology, OSNs&#39; coding properties and their modulation at the membrane level.&#160;

Analyzing the physiological properties of olfactory sensory neurons still faces technical limitations. Here we record them through perforated patch-clamp in an intact preparation of the olfactory epithelium in gene-targeted mice. This technique allows the characterization of membrane properties and responses to specific ligands of neurons expressing defined olfactory receptors.

Bozulmamış neuroepithelium Fare Koku Duyu Nöronlar Delikli Patch-kelepçe Kayıt: Bir Belirlenen Odorant Reseptör ifade Nöronlar Fonksiyonel Analiz

Analyzing the physiological responses of olfactory sensory neurons (OSN) when stimulated with specific ligands is critical to understand the basis of ...

Recording Temperature-induced Neuronal Activity through Monitoring Calcium Changes in the Olfactory Bulb of Xenopus laevis

The olfactory system, specialized in the detection, integration and processing of chemical molecules is likely the most thoroughly studied sensory system. However, there is piling evidence that olfaction is not solely limited to chemical sensitivity, but also includes temperature sensitivity. Premetamorphic Xenopus laevis are translucent animals, with protruding nasal cavities deprived of the cribriform plate separating the nose and the olfactory bulb. These characteristics make them well suited for studying olfaction, and particularly thermosensitivity. The present article describes the complete procedure for measuring temperature responses in the olfactory bulb of X. laevis larvae. Firstly, the electroporation of olfactory receptor neurons (ORNs) is performed with spectrally distinct dyes loaded into the nasal cavities in order to stain their axon terminals in the bulbar neuropil. The differential staining between left and right receptor neurons serves to identify the &#947;-glomerulus as the only structure innervated by contralateral presynaptic afferents. Secondly, the electroporation is combined with focal bolus loading in the olfactory bulb in order to stain mitral cells and their dendrites. The 3D brain volume is then scanned under line-illumination microscopy for the acquisition of fast calcium imaging data while small temperature drops are induced at the olfactory epithelium. Lastly, the post-acquisition analysis allows the morphological reconstruction of the thermosensitive network comprising the &#947;-glomerulus and its innervating mitral cells, based on specific temperature-induced Ca2+ traces. Using chemical odorants as stimuli in addition to temperature jumps enables the comparison between thermosensitive and chemosensitive networks in the olfactory bulb.

Recording Temperature-induced Neuronal Activity through Monitoring Calcium Changes in the Olfactory Bulb of Xenopus laevis

Here we describe a protocol for measuring and analyzing temperature responses in the olfactory bulb of Xenopus laevis. Olfactory receptor neurons and mitral cells are differentially stained, after which calcium changes are recorded, reflecting a sensitivity of some neural networks in the bulb to temperature drops induced at the nose.

koku ampul kalsiyum Değişiklikleri İzleme yoluyla Sıcaklık kaynaklı Nöronal Aktivite Kayıt<em&gt; Xenopus laevis</em

The olfactory system, specialized in the detection, integration and processing of chemical molecules is likely the most thoroughly studied sensory system. ...

Recording Synaptic Plasticity in Acute Hippocampal Slices Maintained in a Small-volume Recycling-, Perfusion-, and Submersion-type Chamber System

Even though experiments on brain slices have been in use since 1951, problems remain that reduce the probability of achieving a stable and successful analysis of synaptic transmission modulation when performing field potential or intracellular recordings. This manuscript describes methodological aspects that might be helpful in improving experimental conditions for the maintenance of acute brain slices and for recording field excitatory postsynaptic potentials in a commercially available submersion chamber with an outflow-carbogenation unit. The outflow-carbogenation helps to stabilize the oxygen level in experiments that rely on the recycling of a small buffer reservoir to enhance the cost-efficiency of drug experiments. In addition, the manuscript presents representative experiments that examine the effects of different carbogenation modes and stimulation paradigms on the activity-dependent synaptic plasticity of synaptic transmission.

This protocol describes the stabilization of the oxygen level in a small volume of recycled buffer and methodological aspects of recording activity-dependent synaptic plasticity in submerged acute hippocampal slices.

Sinaptik plastisite akut Hipokampal dilimleri bir küçük hacimli geri dönüşüm-, perfüzyon- ve batma-tipi oda sistemi içinde tutulan kayıt

Even though experiments on brain slices have been in use since 1951, problems remain that reduce the probability of achieving a stable and successful ...

Imaging Neural Activity in the Primary Somatosensory Cortex Using Thy1-GCaMP6s Transgenic Mice

The mammalian brain exhibits marked symmetry across the sagittal plane. However, detailed description of neural dynamics in symmetric brain regions in adult mammalian animals remains elusive. In this study, we describe an experimental procedure for measuring calcium dynamics through dual optical windows above bilateral primary somatosensory corticies (S1) in Thy1-GCaMP6s transgenic mice using 2-photon (2P) microscopy. This method enables recordings and quantifications of neural activity in bilateral mouse brain regions one at a time in the same experiment for a prolonged period in vivo. Key aspects of this method, which can be completed within an hour, include minimally invasive surgery procedures for creating dual optical windows, and the use of 2P imaging. Although we only demonstrate the technique in the S1 area, the method can be applied to other regions of the living brain facilitating the elucidation of structural and functional complexities of brain neural networks.

Imaging Neural Activity in the Primary Somatosensory Cortex Using Thy1-GCaMP6s Transgenic Mice

We describe an experimental procedure for measuring neuronal activity through dual optical windows above bilateral primary somatosensory corticies (S1) in Thy1-GCaMP6s transgenic mice using 2-photon (2P) microscopy in vivo.

Sinirsel aktivite Thy1kullanarak birincil somatosensor kortekste Imaging-GCaMP6s transgenik fareler

The mammalian brain exhibits marked symmetry across the sagittal plane. However, detailed description of neural dynamics in symmetric brain regions in ...

Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers

Anesthesia arguably provides one of the only systematic ways to study the neural correlates of global consciousness/unconsciousness. However to date most neuroimaging or neurophysiological investigations in humans have been confined to the study of &#947;-Amino-Butyric-Acid-(GABA)-receptor-agonist-based anesthetics, while the effects of dissociative N-Methyl-D-Aspartate-(NMDA)-receptor-antagonist-based anesthetics ketamine, nitrous oxide (N2O) and xenon (Xe) are largely unknown. This paper describes the methods underlying the simultaneous recording of magnetoencephalography (MEG) and electroencephalography (EEG) from healthy males during inhalation of the gaseous anesthetic agents N2O and Xe. Combining MEG and EEG data enables the assessment of electromagnetic brain activity during anesthesia at high temporal, and moderate spatial, resolution. Here we describe a detailed protocol, refined over multiple recording sessions, that includes subject recruitment, anesthesia equipment setup in the MEG scanner room, data collection and basic data analysis. In this protocol each participant is exposed to varying levels of Xe and N2O in a repeated measures cross-over design. Following relevant baseline recordings participants are exposed to step-wise increasing inspired concentrations of Xe and N2O of 8, 16, 24 and 42%, and 16, 32 and 47% respectively, during which their level of responsiveness is tracked with an auditory continuous performance task (aCPT). Results are presented for a number of recordings to highlight the sensor-level properties of the raw data, the spectral topography, the minimization of head movements, and the unequivocal level dependent effects on the auditory evoked responses. This paradigm describes a general approach to the recording of electromagnetic signals associated with the action of different kinds of gaseous anesthetics, which can be readily adapted to be used with volatile and intravenous anesthetic agents. It is expected that the method outlined can contribute to the understanding of the macro-scale mechanisms of anesthesia by enabling methodological extensions involving source space imaging and functional network analysis.

Simultaneous magnetoencephalography and electroencephalography provides a useful tool to search for common and distinct macro-scale mechanisms of reductions in consciousness induced by different anesthetics. This paper illustrates the empirical methods underlying the recording of such data from healthy humans during N-Methyl-D-Aspartate-(NMDA)-receptor-antagonist-based anesthesia during inhalation of nitrous oxide and xenon.

Kayıt beyin elektromanyetik aktivite sırasında gaz halinde olan yakıtlar anestezik ajanların Xenon ve sağlıklı gönüllü olarak azot oksit İdaresi

Anesthesia arguably provides one of the only systematic ways to study the neural correlates of global consciousness/unconsciousness. However to date most ...