المؤلفون ممتنون لأولريش Marggraf (ISAS) لSU-8 تلفيق وماريا بيكر (ISAS) لSEM التصوير. وأيد هذا البحث من الناحية المالية من قبل دويتشه FÜR للبحوث (DFG WE3737/3-1)، وهي منحة Bundesministerium Bildung اوند Forschung (BMBF 0101-31P6541) وقبل Ministerium FÜR الابتكار، Wissenschaft اوند Forschung قصر اندز نوردراين فيستفالن. هايكه Hardelauf بفضل المدرسة الدولية لايبنتز العليا &quot;بيولوجيا الأنظمة المختبر على واحد في رقاقة&quot; للحصول على الدعم المالي.

<ol>
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يعلن الكتاب أنه ليس لديهم مصالح مالية المتنافسة.

تقنية arraying ميكروفلويديك هو الأول من نوعه الذي يتيح دقة التعامل مع الخلايا العصبية واحد لإنشاء الثقافات في أضيق الحدود. إلى جانب الوضع الطبيعي أسلوب الزخرفة مادة بيولوجية في، نهج قوية لمواءمة أنماط الخلية مع هياكل ميكروفلويديك، هذه الثقافات في أضيق الحدود ...

<html> الأنسجة العصبية هي معقدة للغاية؛ خليط غير متجانس الخلوية التي أمرت مكانيا داخل طبقات ومقصورات المعرفة والربط مع البلاستيك عن طريق الاتصال الخليوي، وخصوصا عن طريق محور عصبي والتغصنات الامتداد. ويلزم تقنيات جديدة لمنح مزيد من الحرية التجريبية لاكتساب رؤى أعمق وآليات تنحل المركزية للمرض، والتنمية، وظيفة صحية. غرفة Campenot 1،2 و microfabricated مؤخرا تجسيد 3،4 يمكن استخدامها لخارج الحي إعداد الشبكات العصبية المشترك الثقافات، مع القدرة على التشويش انتقائي السكان جسدية مختلفة، وأيضا الامتداد محوار بهم. وعلى سبيل المثال تم استخدام هذه الأجهزة ميكروفلويديك لدراسة تنكس محور عصبي والتجديد التالية الكيميائية أو الليزر 5،6 axotomy 6-8، tauopathy 9، نشر الفيروسية 10،11، ومرنا في توطين المحاور 4. الأنف والحنجرة &quot;&gt; لتوسيع نطاق من بيولوجيا عصبية، يطلب من التطورات التكنولوجية لإعداد أضيق الحدود العصبية المشترك الثقافات. وهذا يتيح disentanglement الشبكة العصبية للتحقيق في النظام مع خلية واحدة والدقة شبه الخلوية. متطلبات الحد الأدنى من أعداد الخلايا يفتح إمكانية لتحليل أنواع الخلايا النادرة، بما في ذلك خلايا الدوبامين substantia الرمادية ذات الصلة لمرض باركنسون، والعقد دوامة من الأذن، الخلايا العصبية الطرفية، والخلايا الجذعية. أبعد من ذلك، والاقتصاد الخلوية هي ذات الصلة إلى المبادرة 3RS. باستخدام هذه المنصات ميكروفلويديك، شاشات سمية على نطاق واسع أو غيرها من إنتاجية عالية، سلسلة البيانات التجريبية الغنية التي تتطلب الخلايا العصبية الحيوانية ويمكن الآن النظر فيها. في هذه الورقة تم وصفها بروتوكولات لتصنيع واستخدام جهاز ميكروفلويديك. arraying ميكروفلويديك في تركيبة مع biomateri في الموقع<html> آل أسلوب الزخرفة يمكن استخدامها لتسجيل مترابطة للغاية العصبية المشترك الثقافات باستخدام أرقام الخلية الحد الأدنى. ويستند arraying ميكروفلويديك على نهج تدفق التفاضلية 12-15، حيث يتم وضع الشراك microstructured داخل الدائرة فلويديك (موضح جنبا إلى جنب مع الصور ووزارة شؤون المرأة في الشكل 1). المسار 0 → 1 ديه مقاومة أقل فلويديك (R 2&gt; R 1) لنقل الخلايا العصبية لمجموعة خطية من فتحات microstructured - مداخل إلى قنوات ثمرة neurite. شغل في فخ من قبل خلية واحدة يعوق تدفق محليا لتحويل يبسط لمحاصرة الخلايا اللاحقة في الفخاخ المجاورة. الإشغال كاملة من الفخاخ في مجموعة مفاتيح نسبة فلويديك (R 1&gt; R 2) لتحويل يبسط في طريق اعوج (0 → 2) لإنتاج وضع الالتفافية من عملية لإزالة الخلايا العصبية الزائدة. ق ق = &quot;jove_content&quot; FO: المحافظة على together.within صفحة = &quot;دائما&quot;&gt; <img alt="الشكل 1" fo:content-width="5in" src="/files/ftp_upload/51389/51389fig1highres.jpg" width="500" /> الشكل 1. ميكروفلويديك الدائرة. أ) الدائرة المقاومة التفاضلية فلويديك لarraying الخلايا العصبية واحد، مع المرافقة غرف ثقافة مترابطة عن طريق قنوات ثمرة neurite. B، C الصور) ووزارة شؤون المرأة من طبقة ثنائية الخلايا العصبية مجزأة شارك في ثقافة مجموعة مع الغضروف المفصلي تعلق micropillars. مع هذا التصميم، استخدمت الهياكل العصبية محاصرة على شكل ترايدنت لتعزيز تليف من الامتداد محوار. الرقم وأسطورة تتكرر بإذن من الجمعية الملكية للكيمياء (RSC) 12. <a href="https://www.jove.com/files/ftp_upload/51389/51389fig1highres.jpg" target="_blank">اضغط هنا لمشاهدة صورة أكبر.</a> يمكن بسهولة أن يتحقق إعداد الشبكات العصبية micropatterned على ركائز مستو (لالامثله<html> وفاق من مجموعتنا، انظر Frimat وآخرون 16 وهايكه وآخرون 17). ومع ذلك، التغليف أنماط المواد النشطة بيولوجيا داخل الأجهزة PDMS ومع متطلبات المواءمة ميكرومتر نطاق هذه إلى قنوات ميكروفلويديك يشكل تحديا تقنيا كبيرا. في القسم 3.1 في رقاقة، أو في الموقع، ويقدم إعداد أنماط بيولوجية بروتوكول لل. هذه الأنماط تمكين تسجيل الخلايا العصبية خلال فترات زمنية مطولة وتعزيز ثقافة الامتداد بين المقصورات. وتستخدم المجهرية الغضروف المفصلي، تعلق لمحاذاة ما يسمى قناع المياه مع الخلايا العصبية arraying المواقع والقنوات ثمرة neurite. قناع يحمي الطلاء المياه جزيء التصاق أثناء العلاج البلازما، بينما تفككت الأسطح المكشوفة لتعريف نمط مادة بيولوجية. بالإضافة إلى ذلك، يتم توفير بروتوكولات لخلية ثقافة والعزلة فلويديك اللازمة لعلاج انتقائية لمختلف المقصورات ثقافة مشتركة. ve_content &quot;&gt; تم تصميم بروتوكولات للاستفادة من المبادئ الصديقة للمستخدم الطباعة الحجرية الناعمة لتكرار بولي (dimethylsiloxane) (PDMS) الأجهزة ميكروفلويديك 18. وبالمثل، مادة بيولوجية في الوضع الطبيعي الزخرفة واضح ومباشر، واستغلال التبخر والسطح ظواهر التوتر، وفقط تتطلب باليد مصدر البلازما غير مكلفة. الدائرة ميكروفلويديك فعالية العلاجات برامج التحميل ومقصورة خلية محددة مما يجعل هذه العمليات مجرد مسألة الاستغناء المواد في منفذ أسفل الصحيح والشفط من فوق. وبهذه الطريقة، فإنه يهدف إلى إعطاء بيولوجيا عصبية الحرية لإعداد واستخدام أجهزة ميكروفلويديك في المختبرات الخاصة.

<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>
			<td style="width:163px;"></td>
			<td style="width:143px;"></td>
			<td></td>
		</tr>
	</tbody>
</table>

preparation of neuronal co-cultures with single cell precision

وقد اجتذبت تجسيد ميكروفلويديك للغرفة Campenot اهتماما كبيرا من المجتمع الأعصاب. هذه المنصات شارك في الثقافة مترابطة يمكن استخدامها لتحقيق مجموعة متنوعة من الأسئلة، والتي تمتد بيولوجيا الأعصاب التنموية والوظيفية للعدوى وانتشار المرض. ومع ذلك، الأنظمة التقليدية تتطلب مدخلات هامة الخلوية (عدة آلاف في المقصورة)، وعدم كفاية لدراسة الخلايا وفرة منخفضة، مثل الدوبامين substantia الرمادية الأولية، دوامة العقد، وDrosophilia الخلايا العصبية البطن، وغير عملي بالنسبة لإنتاجية عالية التجريب. كما متشابكا للغاية محليا الثقافات الكثيفة، مع عدد قليل من الامتداد (&lt;10٪) ربط الثقافتين. في هذه الورقة تم وصفها بروتوكولات ميكروفلويديك والزخرفة واضحة تعالج هذه التحديات: (ط) عصبون واحد ميكروفلويديك arraying الأسلوب، و (ب) طريقة اخفاء المياه عن الزخرفة البلازما الطلاء مادة بيولوجية لريجيستير الخلايا العصبية وتعزيز نمو بين المقصورات. أعدت أضيق الحدود العصبية المشترك الثقافات مع مستوى عال (&gt; 85٪) الربط intercompartment ويمكن استخدامها لإنتاجية عالية الدقة مع التجارب بيولوجيا الأعصاب خلية واحدة.

مآثر اخفاء المياه السطحية التوتر. التسامح الضغط في واجهة الهواء السائل موازين عكسيا مع نصف قطر انحناء [ <img fo:content-width="1in" src="files/ftp_upload/51389/51389eq1.jpg" width="113" /> ، وإنتاج واجهات درجة عالية من الاستقرار في أبعاد ميكروفلويديك. وmicropillars ترسيخ فعال قناع المياه في المكان. هو الدافع و?...

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

يتم وصف بروتوكولات لاحد الخلايا العصبية ميكروفلويديك arraying واخفاء المياه للالزخرفة البلازما الطلاء مادة بيولوجية في رقاقة. مترابطة للغاية المشترك الثقافات يمكن إعدادها باستخدام الحد الأدنى من المدخلات الخلية.

إعداد العصبية المشارك الثقافات واحدة مع الدقة الخليوي

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

13.6K Views.  ISAS.  يتم وصف بروتوكولات لاحد الخلايا العصبية ميكروفلويديك arraying واخفاء المياه للالزخرفة البلازما الطلاء مادة بيولوجية في رقاقة. مترابطة للغاية المشترك الثقافات يمكن إعدادها باستخدام الحد الأدنى من المدخلات الخلية. 

Video: Preparation of Neuronal Co-cultures with Single Cell Precision

Derivation of Enriched Oligodendrocyte Cultures and Oligodendrocyte/Neuron Myelinating Co-cultures from Post-natal Murine Tissues

Identifying the molecular mechanisms underlying OL development is not only critical to furthering our knowledge of OL biology, but also has implications for understanding the pathogenesis of demyelinating diseases such as Multiple Sclerosis (MS). Cellular development is commonly studied with primary cell culture models. Primary cell culture facilitates the evaluation of a given cell type by providing a controlled environment, free of the extraneous variables that are present in vivo. While OL cultures derived from rats have provided a vast amount of insight into OL biology, similar efforts at establishing OL cultures from mice has been met with major obstacles. Developing methods to culture murine primary OLs is imperative in order to take advantage of the available transgenic mouse lines. 
Multiple methods for extraction of OPCs from rodent tissue have been described, ranging from neurosphere derivation, differential adhesion purification and immunopurification 1-3. While many methods offer success, most require extensive culture times and/or costly equipment/reagents. To circumvent this, purifying OPCs from murine tissue with an adaptation of the method originally described by McCarthy &amp; 
de Vellis 2 is preferred. This method involves physically separating OPCs from a mixed glial culture derived from neonatal rodent cortices. The result is a purified OPC population that can be differentiated into an OL-enriched culture. This approach is appealing due to its relatively short culture time and the unnecessary requirement for growth factors or immunopanning antibodies. 
While exploring the mechanisms of OL development in a purified culture is informative, it does not provide the most physiologically relevant environment for assessing myelin sheath formation. Co-culturing OLs with neurons would lend insight into the molecular underpinnings regulating OL-mediated myelination of axons. For many OL/neuron co-culture studies, dorsal root ganglion neurons (DRGNs) have proven to be the neuron type of choice. They are ideal for co-culture with OLs due to their ease of extraction, minimal amount of contaminating cells, and formation of dense neurite beds. While studies using rat/mouse myelinating xenocultures have been published 4-6, a method for the derivation of such OL/DRGN myelinating co-cultures from post-natal murine tissue has not been described. Here we present detailed methods on how to effectively produce such cultures, along with examples of expected results. These methods are useful for addressing questions relevant to OL development/myelinating function, and are useful tools in the field of neuroscience.

This article describes methods to derive enriched populations of murine oligodendrocyte precursor cells (OPCs) in primary culture, which differentiate to produce mature oligodendrocytes (OLs). In addition, this report describes techniques to produce murine myelinating co-cultures by seeding mouse OPCs onto a neurite bed of mouse dorsal root ganglion neurons (DRGNs).

الاشتقاق الثقافات Oligodendrocyte المخصب وOligodendrocyte نيورون / Myelinating المشارك من الثقافات في مرحلة ما بعد الولادة مناديل الفئران

Identifying the molecular mechanisms underlying OL development is not only critical to furthering our knowledge of OL biology, but also has implications ...

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.

واحدة من خلية قياس إفراز الدوبامين في وقت واحد مع المشبك الجهد وAmperometry

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.

بصري تسجيل النشاط العصبي للقرار suprathreshold وحيدة الخلية واحد مسمار-

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.

في وقت واحد قبل وبعد متشابك تسجيل الكهربية من<em&gt; القيطم</em&gt; العصبي العضلي المشارك الثقافات

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.

إجراء لغرس صالحة المنظمة من Microwires للتسجيلات واحدة وحدة في استيقظ، تتصرف الحيوانات

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.

حمل اللدونة من نجمي المستقبلات بواسطة التلاعب أسعار اطلاق النار متعلق بالخلايا العصبية

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.

التحقيق التجديد الوظيفي في الحبل الشوكي عضوي النمط المشارك الثقافات نمت على صفائف متعدد القطب

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.

خارج الخلية تسجيل النشاط العصبية جنبا إلى جنب مع Microiontophoretic تطبيق المواد Neuroactive في الفئران مستيقظا

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.

في الرحم النهج Electroporation لللدراسة استثارة الخلايا العصبية القطعان والربط وحيدة الخلية

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.

بلعم العصبية الثقافات المشارك لتفعيل الضامة إفراز العوامل الجزيئية مع نشاط ثمرة نورت

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