这项工作是由美国NINDS - 美国国立卫生研究院R01NS060756

1。开始之前的海马脑片的制备。 <ol><li>准备放置一块聚四氟乙烯板，并安装一个新的刀片组织切片机。 </li><li>用70％乙醇擦拭组织培养（TC），引擎盖和设置解剖显微镜内。消毒的油烟机，显微镜，组织切片机和紫外线灯15分钟所有解剖工具。 </li><li>准备6家训练班板。每孔加750μL，切片文化传媒（SCM）的每口井和地点细胞培养插入。确保彻底湿膜与无气泡下方。板块放置在孵化器在35 ° C与5％的CO 2毒气，直到需要。 </li><li> 100 mL烧杯中倒入50毫升低的Na +学联（解剖解决方案），并放置在冰盐水混合。泡沫低的Na +学联与5％的CO 2 / O 2的 95％，直到颜色变化和学联形式浆混合的冷冻和液体的解决方案（10-20分钟） 。 </li><li>获取一个P5 - P7的大鼠小狗。最多可以使用三个幼仔。 </li></ol> 2。海马脑片制备。 <ol><li>剪切锋利的实用工具剪刀头的动物。切开皮肤，暴露颅骨。打开，从一侧到另一侧，沿双耳线切割，然后用小剪刀沿矢状缝的头骨。可从一侧到另一侧的前一个可选的削减，以方便取出骨骼和大脑暴露。大脑迅速舀出一个圆形的微勺锅铲，并放置在解剖解决方案寒意〜1分钟浆。到60毫米的菜倒入〜10毫升的冰冷的解剖解决方案的脑转移，从烧杯中的菜。应包括大脑解剖解决方案。 </li><li>在解剖显微镜：将脑解剖钳压到60毫米培养皿的底部，并保持在中线。使用海马解剖工具，单独留出脑半球。海马是暴露在每个半球。然后轻轻舀海马与海马解剖工具。用解剖针完全隔离的海马和尽可能干净。 </li><li>剪断提示使用了P1000的过滤器枪头，轻轻吸海马和转移聚四氟乙烯薄片的组织切片机上。其凹侧海马的位置。 </li><li>海马垂直对齐刀片获得冠状切片，沥干液体过剩。 </li><li>切片海马每400微米。 </li><li>倒入60毫米的菜和转让使用另一个剪断P1000的过滤嘴和冷SCM切片从切片海马〜10毫升冷供应链管理。避免气泡。 </li><li>随着虹膜锅铲的帮助和直铲轻轻彼此分开的切片。 </li><li>从损坏的片分开的明确界定，并完好的片。 </li></ol> 3。海马脑片文化<ol><li>与SCM和细胞培养孵化器插入带来的六孔板。另一剪断P1000的过滤嘴的帮助，转移到细胞膜中的个别切片。将每4-5片膜。要小心，不要将切片插入墙上或接近对方。必要时，使用虹膜锅铲单独的片。删除多余的介质。一旦他们对膜触摸片尽可能少。 </li><li>移动板背面，以孵化器和文化，在35 ° C和5％的CO 2 。 </li><li>训练班罩内的变化与巴斯德吸管吸的SCM单片机每48小时。加入750μL新鲜预热SCM每口井。确保无气泡膜下形成的。 </li></ol> 4。解决方案<ol><li>低Na +的学联-解剖切片文化的解决方案 去离子和无菌H 2 O添加： <table border="1"><tbody><tr><td></td><td> 对于500毫升 </td><td> 对于1000毫升 </td><td> 终浓度 </td></tr><tr><td> 氯化钙 （1米） </td><td> 0.5毫升</td><td> 1毫升</td><td> 1毫米</td></tr><tr><td> D -葡萄糖</td><td> 0.901摹</td><td> 1.802克</td><td> 10毫米</td></tr><tr><td>氯化钾</td><td> 0.149摹</td><td> 0.298摹</td><td> 4毫米</td></tr><tr><td> MgCl 2的 （1米） </td><td> 2.5毫升</td><td> 5毫升</td><td> 5毫米</td></tr><tr><td>碳酸氢钠3 </td><td> 1.092摹</td><td> 2.184摹</td><td> 26毫米</td></tr><tr><td>蔗糖</td><td> 40克</td><td> 80克</td><td> 234 mM的</td></tr><tr><td>酚红溶液0.5％，在DPBS </td><td> 0.5毫升</td><td> 1毫升</td><td> 0.1％V / V </td></tr></tbody></table> 混合〜30分钟 灭菌通过IZE通过0.22μm的过滤器 在4 ° C不超过2个月50毫升分装和存储。 </li><li>切片培养液（SCM） <table border="1"><tbody><tr><td></td><td> 对于500毫升 </td><td> 对于1000毫升 </td><td> 终浓度 </td></tr><tr><td>纪念鹰培养基</td><td> 4.2摹</td><td> 8.4摹</td><td> 8.4克/升</td></tr><tr><td>马血清热灭活</td><td> 100毫升</td><td> 200毫升</td><td> 20％ </td></tr><tr><td> L -谷氨酰胺（200毫米） </td><td> 2.5毫升</td><td> 5毫升</td><td> 1毫米</td></tr><tr><td> 氯化钙 （1米） </td><td> 0.5毫升</td><td> 1毫升</td><td> 1毫米</td></tr><tr><td> 硫酸镁 （1米） </td><td> 1毫升</td><td> 2毫升</td><td> 2毫米</td></tr><tr><td>胰岛素（1毫克/毫升），溶解在盐酸0.01 N </td><td> 0.5毫升</td><td> 1毫升</td><td> 1毫克/升</td></tr><tr><td>抗坏血酸溶液（25％W / V） </td><td> 0.024毫升</td><td> 0.048毫升</td><td> 0.00125％ </td></tr><tr><td> D -葡萄糖</td><td> 1.16克</td><td> 2.32克</td><td> 13毫米</td></tr><tr><td>碳酸氢钠3 </td><td> 0.22克</td><td> 0.44克</td><td> 5.2毫米</td></tr><tr><td> HEPES </td><td> 3.58克</td><td> 7.16克</td><td> 30毫米</td></tr></tbody></table> 混合，直至彻底溶解并带至室温。 1 N氢氧化钠调节pH至7.27-7.28 测量渗透压。调整到320毫摩尔/公斤，与去离子和消毒H 2 O预计增加约25-40毫升。再次检查渗透压。 *** pH值可能会略有变化而调整渗透压，这是确定的，更重要的是，在正确的范围内（317-323）的渗透压。 通过0.22微米的过滤器通过消毒。 20毫升分装和存储长达两三个星期在4 ° C。 Gluatamine股票：准备200毫米和储存的浓度在2.5毫升分装在-20 ° C。 抗坏血酸股票：准备在浓度为25％（W / V）和100μL分装保存在-20 ° C。 </li></ol> 5。代表性的成果： 片应根据解剖范围看白无黑点，并明确界定，并完好的CA1，CA3，齿状回区域。细菌污染是很容易被视为在中期或浊度的SCM移动的小黑点。当置于显微镜下，片表面应干净，清晰和discernibly细胞机构照顾4天中文化。如果没有明确的胞体看到和许多碎片覆盖表面后4天，那么是不是一个健康的切片。

<ol>
	<li>Martin, S. J., Grimwood, P. D., Morris, R. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synaptic+plasticity+and+memory:+an+evaluation+of+the+hypothesis.">Synaptic plasticity and memory: an evaluation of the hypothesis.</a> Annu Rev Neurosci. 23, 649-711 (2000).</li><li>Bliss, T. V., Collingridge, G. L., Morris, R. G. I. n. t. r. o. d. u. c. t. i. o. n. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Long-term+potentiation+and+structure+of+the+issue.">Long-term potentiation and structure of the issue.</a> Philos Trans R Soc Lond B Biol Sci. 358, 607-611 (2003).</li><li>Shepherd, G. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> The synaptic organization of the brain. , (2004).</li><li>Malinow, R., Tsien, R. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Presynaptic+enhancement+shown+by+whole-cell+recordings+of+long-term+potentiation+in+hippocampal+slices.">Presynaptic enhancement shown by whole-cell recordings of long-term potentiation in hippocampal slices.</a> Nature. 346, 177-180 (1990).</li><li>Malinow, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Introduction+of+green+fluorescent+protein+(GFP)+into+hippocampal+neurons+through+viral+infection.">Introduction of green fluorescent protein (GFP) into hippocampal neurons through viral infection.</a> Cold Spring Harb Protoc. , (2010).</li><li>Shi, S., Hayashi, Y., Esteban, J. A., Malinow, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Subunit-specific+rules+governing+AMPA+receptor+trafficking+to+synapses+in+hippocampal+pyramidal+neurons.">Subunit-specific rules governing AMPA receptor trafficking to synapses in hippocampal pyramidal neurons.</a> Cell. 105, 331-343 (2001).</li><li>Woods, G., Zito, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Preparation+of+gene+gun+bullets+and+biolistic+transfection+of+neurons+in+slice+culture.">Preparation of gene gun bullets and biolistic transfection of neurons in slice culture.</a> J Vis Exp. , (2008).</li><li>Esteban, J. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=PKA+phosphorylation+of+AMPA+receptor+subunits+controls+synaptic+trafficking+underlying+plasticity.">PKA phosphorylation of AMPA receptor subunits controls synaptic trafficking underlying plasticity.</a> Nat Neurosci. 6, 136-143 (2003).</li><li>Mainen, Z. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Two-photon+imaging+in+living+brain+slices.">Two-photon imaging in living brain slices.</a> Methods. 18, 231-239 (1999).</li><li>Barria, A., Malinow, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Subunit-specific+NMDA+receptor+trafficking+to+synapses.">Subunit-specific NMDA receptor trafficking to synapses.</a> Neuron. 35, 345-353 (2002).</li><li>Stoppini, L., Buchs, P. A., Muller, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+simple+method+for+organotypic+cultures+of+nervous+tissue.">A simple method for organotypic cultures of nervous tissue.</a> J Neurosci Methods. 37, 173-182 (1991).</li><li>Simoni, A. D. e., Griesinger, C. B., Edwards, F. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+rat+CA1+neurones+in+acute+versus+organotypic+slices:+role+of+experience+in+synaptic+morphology+and+activity.">Development of rat CA1 neurones in acute versus organotypic slices: role of experience in synaptic morphology and activity.</a> J Physiol. 550, 135-147 (2003).</li></ol>

上最初Stoppini 等描述的方法，这种方法是基于 11和海马文化提供了一个快速的方式。此协议的最重要的是保持切片无菌;因此，关键是使用适当的无菌技术，并妥善消毒和消毒与组织接触的所有材料。 血清来源的不同可以影响切片质量。我们建议先测试几个批次。如果污染是一个经常出现的问题，检查孵化器和组织文化引擎盖污染的可能来源。正确使用?...

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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">	
		
		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>Cell culture inserts</td>
<td>&nbsp;</td>
<td>Millipore</td>
<td>PICM03050</td>
<td>&nbsp;</td>
<tr>
<td>6 well plates</td>
<td>&nbsp;</td>
<td>BD Falcon</td>
<td>353046</td>
<td>&nbsp;</td>
<tr>
<td>Tissue Slicer</td>
<td>&nbsp;</td>
<td>Stoelting</td>
<td>51425/51415</td>
<td>&nbsp;</td>
<tr>
<td>Microscope</td>
<td>&nbsp;</td>
<td>Olympus</td>
<td>SZX7-ILLD2-100</td>
<td>&nbsp;</td>
<tr>
<td> Hippocampus dissecting tool</td>
<td>&nbsp;</td>
<td>F.S.T</td>
<td>10099-15</td>
<td>&nbsp;</td>
<tr>
<td>Large utility scissors. Perfection</td>
<td>&nbsp;</td>
<td>F.S.T</td>
<td>37500-00/37000-00 Right/ Left handed</td>
<td>&nbsp;</td>
<tr>
<td>Iris Spatula</td>
<td>&nbsp;</td>
<td>F.S.T</td>
<td>10093-13</td>
<td>&nbsp;</td>
<tr>
<td>Straight spatula</td>
<td>&nbsp;</td>
<td>F.S.T</td>
<td>10094-13</td>
<td>&nbsp;</td>
<tr>
<td>Rounded spoon micro spatula</td>
<td>&nbsp;</td>
<td>VWR</td>
<td>57949-039</td>
<td>&nbsp;</td>
<tr>
<td>Dissecting single cutting edge needle</td>
<td>&nbsp;</td>
<td>Electron Microscopy Science</td>
<td>72946</td>
<td>&nbsp;</td>
<tr>
<td>Dissecting tweezers</td>
<td>&nbsp;</td>
<td>Dummont</td>
<td>#2</td>
<td>&nbsp;</td>
<tr>
<td>Small dissecting scissors</td>
<td>&nbsp;</td>
<td>F.S.T</td>
<td>14060-10</td>
<td>&nbsp;</td>
<tr>
<td>MEM Eagle medium</td>
<td>&nbsp;</td>
<td>Cellgro</td>
<td>50-019 PB</td>
<td>&nbsp;</td>
<tr>
<td>Horse serum heat inactivated</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>26050-88</td>
<td>&nbsp;</td>
<tr>
<td>L-Glutamine (200 mM)</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>25030081</td>
<td>&nbsp;</td>
<tr>
<td>CaCl2 (1 M)</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>C3881</td>
<td>&nbsp;</td>
<tr>
<td>MgSO4 (1 M)</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>M2773</td>
<td>&nbsp;</td>
<tr>
<td>Insulin (1 mg/ml), dissolved in HCl 0.01 N</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>I0516</td>
<td>&nbsp;</td>
<tr>
<td>Ascorbic Acid, solution (25%)</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>A4544</td>
<td>&nbsp;</td>
<tr>
<td>D-Glucose</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>G5767</td>
<td>&nbsp;</td>
<tr>
<td>NaHCO3</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>S6014</td>
<td>&nbsp;</td>
<tr>
<td>Hepes</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>H7523</td>
<td>&nbsp;</td>
<tr>
<td>Sucrose</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>S5016</td>
<td>&nbsp;</td>
<tr>
<td>Phenol Red Solution 0.5% in DPBS</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>P0290</td>
<td>&nbsp;</td>
<tr>
<td>KCl</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>P3911</td>
<td>&nbsp;</td>
<tr>
<td>MgCl2 (1 M)</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>M9272</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

organotypic hippocampal slice cultures

海马，边缘系统的一个组成部分，起着重要的作用，在长期记忆和空间导航1。海马神经元后，可以修改其连接的实力较强的激活短暂。这种现象，长时程增强（LTP），可以持续数小时或数天，并已成为学习和记忆2的最佳人选机制。此外，定义良好的解剖和海马 3的连接已成为一个经典的模型系统研究突触传递和突触可塑性的4。 由于我们了解海马突触生理学增长和分子球员成为确定，需要操纵突触蛋白成为当务之急。海马器官型文化提供易于基因操作和精确的药物干预的可能性，但仍维持突触的组织，是了解一个更自然的背景下，比常规培养方法分离​​神经元突触功能的关键。 在这里，我们提出了一个方法，准备和文化，可以很容易地适应大脑的其他区域的海马。这种方法可以方便地访问基因操纵的片，用不同的方法，如病毒感染的5,6 或 biolistics 7。此外，片可以很容易地恢复为8生化分析，或转移到显微镜成像9或10电生理实验。

Watch this Scientific Journal Video about Organotypic Hippocampal Slice Cultures at JoVE.com

Organotypic Hippocampal Slice Cultures

我们描述了一种方法来准备器官可以很容易地适应大脑的其他区域的海马。大脑切片放在多孔膜和文化传媒是可以形成一个接口。这种方法保留了长达2周文化的海马毛架构。

器官型海马切片培养

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

Research

JoVE Journal

Neuroscience

36.9K 次观看.  University of Washington School of Medicine. 我们描述了一种方法来准备器官可以很容易地适应大脑的其他区域的海马。大脑切片放在多孔膜和文化传媒是可以形成一个接口。这种方法保留了长达2周文化的海马毛架构。

视频: Organotypic Hippocampal Slice Cultures

The Organotypic Hippocampal Slice Culture Model for Examining Neuronal Injury

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

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

海马脑片的器官型检查神经元损伤的文化模式

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

科研

神经科学

Whole Cell Recording from an Organotypic Slice Preparation of Neocortex

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

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

从大脑皮层的器官型切片制备全细胞记录

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

Organotypic Slice Cultures of Embryonic Ventral Midbrain: A System to Study Dopaminergic Neuronal Development in vitro

The mouse is an excellent model organism to study mammalian brain development due to the abundance of molecular and genetic data. However, the developing mouse brain is not suitable for easy manipulation and imaging in vivo since the mouse embryo is inaccessible and opaque. Organotypic slice cultures of embryonic brains are therefore widely used to study murine brain development in vitro. Ex-vivo manipulation or the use of transgenic mice allows the modification of gene expression so that subpopulations of neuronal or glial cells can be labeled with fluorescent proteins. The behavior of labeled cells can then be observed using time-lapse imaging. Time-lapse imaging has been particularly successful for studying cell behaviors that underlie the development of the cerebral cortex at late embryonic stages 1-2. Embryonic organotypic slice culture systems in brain regions outside of the forebrain are less well established. Therefore, the wealth of time-lapse imaging data describing neuronal cell migration is restricted to the forebrain 3,4. It is still not known, whether the principles discovered for the dorsal brain hold true for ventral brain areas. In the ventral brain, neurons are organized in neuronal clusters rather than layers and they often have to undergo complicated migratory trajectories to reach their final position. The ventral midbrain is not only a good model system for ventral brain development, but also contains neuronal populations such as dopaminergic neurons that are relevant in disease processes. While the function and degeneration of dopaminergic neurons has been investigated in great detail in the adult and ageing brain, little is known about the behavior of these neurons during their differentiation and migration phase 5. We describe here the generation of slice cultures from the embryonic day (E) 12.5 mouse ventral midbrain. These slice cultures are potentially suitable for monitoring dopaminergic neuron development over several days in vitro. We highlight the critical steps in generating brain slices at these early stages of embryonic development and discuss the conditions necessary for maintaining normal development of dopaminergic neurons in vitro. We also present results from time lapse imaging experiments. In these experiments, ventral midbrain precursors (including dopaminergic precursors) and their descendants were labeled in a mosaic manner using a Cre/loxP based inducible fate mapping system 6.

Organotypic Slice Cultures of Embryonic Ventral Midbrain: A System to Study Dopaminergic Neuronal Development in vitro

A method to generate organotypic slices from the E12.5 murine embryonic midbrain is described. The organotypic slice cultures can be used to observe the behavior of dopaminergic neurons or other ventral midbrain neurons.

胚胎腹侧中脑器官型片文化：一个系统来研究多巴胺能神经元发展在体外</em

The  mouse is an excellent model organism to study mammalian brain development due  to the abundance of molecular and genetic data. However, the ...

The Analysis of Purkinje Cell Dendritic Morphology in Organotypic Slice Cultures

Purkinje cells are an attractive model system for studying dendritic development, because they have an impressive dendritic tree which is strictly oriented in the sagittal plane and develops mostly in the postnatal period in small rodents 3. Furthermore, several antibodies are available which selectively and intensively label Purkinje cells including all processes, with anti-Calbindin D28K being the most widely used. For viewing of dendrites in living cells, mice expressing EGFP selectively in Purkinje cells 11 are available through Jackson labs. Organotypic cerebellar slice cultures cells allow easy experimental manipulation of Purkinje cell dendritic development because most of the dendritic expansion of the Purkinje cell dendritic tree is actually taking place during the culture period 4. We present here a short, reliable and easy protocol for viewing and analyzing the dendritic morphology of Purkinje cells grown in organotypic cerebellar slice cultures. For many purposes, a quantitative evaluation of the Purkinje cell dendritic tree is desirable. We focus here on two parameters, dendritic tree size and branch point numbers, which can be rapidly and easily determined from anti-calbindin stained cerebellar slice cultures. These two parameters yield a reliable and sensitive measure of changes of the Purkinje cell dendritic tree. Using the example of treatments with the protein kinase C (PKC) activator PMA and the metabotropic glutamate receptor 1 (mGluR1) we demonstrate how differences in the dendritic development are visualized and quantitatively assessed. The combination of the presence of an extensive dendritic tree, selective and intense immunostaining methods, organotypic slice cultures which cover the period of dendritic growth and a mouse model with Purkinje cell specific EGFP expression make Purkinje cells a powerful model system for revealing the mechanisms of dendritic development.

We present a protocol that permits to view and to quantitatively asses the morphology of the dendritic tree of individual Purkinje cells grown in organotypic cerebellar slice cultures. This protocol is intended to promote studies on the mechanisms of Purkinje cell dendritic development.

浦肯野细胞树突形态的器官切片培养分析

Purkinje cells are an attractive model system for studying dendritic development, because they have an impressive dendritic tree which is strictly ...

Post-embedding Immunogold Labeling of Synaptic Proteins in Hippocampal Slice Cultures

Immunoelectron microscopy is a powerful tool to study biological molecules at the subcellular level. Antibodies coupled to electron-dense markers such as colloidal gold can reveal the localization and distribution of specific antigens in various tissues1. The two most widely used techniques are pre-embedding and post-embedding techniques. In pre-embedding immunogold-electron microscopy (EM) techniques, the tissue must be permeabilized to allow antibody penetration before it is embedded. These techniques are ideal for preserving structures but poor penetration of the antibody (often only the first few micrometers) is a considerable drawback2. The post-embedding labeling methods can avoid this problem because labeling takes place on sections of fixed tissues where antigens are more easily accessible. Over the years, a number of modifications have improved the post-embedding methods to enhance immunoreactivity and to preserve ultrastructure3-5.
Tissue fixation is a crucial part of EM studies. Fixatives chemically crosslink the macromolecules to lock the tissue structures in place. The choice of fixative affects not only structural preservation but also antigenicity and contrast. Osmium tetroxide (OsO4), formaldehyde, and glutaraldehyde have been the standard fixatives for decades, including for central nervous system (CNS) tissues that are especially prone to structural damage during chemical and physical processing. Unfortunately, OsO4 is highly reactive and has been shown to mask antigens6, resulting in poor and insufficient labeling. Alternative approaches to avoid chemical fixation include freezing the tissues. But these techniques are difficult to perform and require expensive instrumentation. To address some of these problems and to improve CNS tissue labeling, Phend et al. replaced OsO4 with uranyl acetate (UA) and tannic acid (TA), and successfully introduced additional modifications to improve the sensitivity of antigen detection and structural preservation in brain and spinal cord tissues7. We have adopted this osmium-free post-embedding method to rat brain tissue and optimized the immunogold labeling technique to detect and study synaptic proteins.
We present here a method to determine the ultrastructural localization of synaptic proteins in rat hippocampal CA1 pyramidal neurons. We use organotypic hippocampal cultured slices. These slices maintain the trisynaptic circuitry of the hippocampus, and thus are especially useful for studying synaptic plasticity, a mechanism widely thought to underlie learning and memory. Organotypic hippocampal slices from postnatal day 5 and 6 mouse/rat pups can be prepared as described previously8, and are especially useful to acutely knockdown or overexpress exogenous proteins. We have previously used this protocol to characterize neurogranin (Ng), a neuron-specific protein with a critical role in regulating synaptic function8,9 . We have also used it to characterize the ultrastructural localization of calmodulin (CaM) and Ca2+/CaM-dependent protein kinase II (CaMKII)10. As illustrated in the results, this protocol allows good ultrastructural preservation of dendritic spines and efficient labeling of Ng to help characterize its distribution in the spine8. Furthermore, the procedure described here can have wide applicability in studying many other proteins involved in neuronal functions.

The localization and distribution of proteins provide important information for understanding their cellular functions. The superior spatial resolution of electron microscopy (EM) can be used to determine the subcellular localization of a given antigen following immunohistochemistry. For tissues of the central nervous system (CNS), preserving structural integrity while maintaining antigenicity has been especially difficult in EM studies. Here, we adopt a procedure that has been used to preserve structures and antigens in the CNS to study and characterize synaptic proteins in rat hippocampal CA1 pyramidal neurons.

嵌入后突触蛋白的免疫标记海马切片培养

Immunoelectron microscopy is a powerful tool to study biological molecules at the subcellular level. Antibodies coupled to electron-dense markers such as ...

Organotypic Slice Cultures to Study Oligodendrocyte Dynamics and Myelination

NG2 expressing cells (polydendrocytes, oligodendrocyte precursor cells) are the fourth major glial cell population in the central nervous system. During embryonic and postnatal development they actively proliferate and generate myelinating oligodendrocytes. These cells have commonly been studied in primary dissociated cultures, neuron cocultures, and in fixed tissue. Using newly available transgenic mouse lines slice culture systems can be used to investigate proliferation and differentiation of oligodendrocyte lineage cells in both gray and white matter regions of the forebrain and cerebellum. Slice cultures are prepared from early postnatal mice and are kept in culture for up to 1 month. These slices can be imaged multiple times over the culture period to investigate cellular behavior and interactions. This method allows visualization of NG2 cell division and the steps leading to oligodendrocyte differentiation while enabling detailed analysis of region-dependent NG2 cell and oligodendrocyte functional heterogeneity. This is a powerful technique that can be used to investigate the intrinsic and extrinsic signals influencing these cells over time in a cellular environment that closely resembles that found in vivo.

A technique to study NG2 cells and oligodendrocytes using a slice culture system of the forebrain and cerebellum is described. This method allows examination of the dynamics of proliferation and differentiation of cells within the oligodendrocyte lineage where the extracellular environment can be easily manipulated while maintaining tissue cytoarchitecture.

器官切片文化研究少突胶质细胞动力学和髓鞘

NG2 expressing cells (polydendrocytes, oligodendrocyte precursor cells) are the fourth major glial cell population in the central nervous system. During ...

Paired Whole Cell Recordings in Organotypic Hippocampal Slices

Pair recordings involve simultaneous whole cell patch clamp recordings from two synaptically connected neurons, enabling not only direct electrophysiological characterization of the synaptic connections between individual neurons, but also pharmacological manipulation of either the presynaptic or the postsynaptic neuron. When carried out in organotypic hippocampal slice cultures, the probability that two neurons are synaptically connected is significantly increased. This preparation readily enables identification of cell types, and the neurons maintain their morphology and properties of synaptic function similar to that in native brain tissue. A major advantage of paired whole cell recordings is the highly precise information it can provide on the properties of synaptic transmission and plasticity that are not possible with other more crude techniques utilizing extracellular axonal stimulation. Paired whole cell recordings are often perceived as too challenging to perform. While there are challenging aspects to this technique, paired recordings can be performed by anyone trained in whole cell patch clamping provided specific hardware and methodological criteria are followed. The probability of attaining synaptically connected paired recordings significantly increases with healthy organotypic slices and stable micromanipulation allowing independent attainment of pre- and postsynaptic whole cell recordings. While CA3-CA3 pyramidal cell pairs are most widely used in the organotypic slice hippocampal preparation, this technique has also been successful in CA3-CA1 pairs and can be adapted to any neurons that are synaptically connected in the same slice preparation. In this manuscript we provide the detailed methodology and requirements for establishing this technique in any laboratory equipped for electrophysiology.

Pair recordings are simultaneous whole cell patch clamp recordings from two synaptically connected neurons, enabling precise electrophysiological and pharmacological characterization of the synapses between individual neurons. Here we describe the detailed methodology and requirements for establishing this technique in organotypic hippocampal slice cultures in any laboratory equipped for electrophysiology.

在器官型海马脑片搭配全细胞记录

Pair recordings involve simultaneous whole cell patch clamp recordings from two synaptically connected neurons, enabling not only direct ...

The Analysis of Neurovascular Remodeling in Entorhino-hippocampal Organotypic Slice Cultures

Ischemic brain injury is among the most common and devastating conditions compromising proper brain function and often leads to persisting functional deficits in the affected patients. Despite intensive research efforts, there is still no effective treatment option available that reduces neuronal injury and protects neurons in the ischemic areas from delayed secondary death. Research in this area typically involves the use of elaborate and problematic animal models. Entorhino-hippocampal organotypic slice cultures challenged with oxygen and glucose deprivation (OGD) are established in&#160;vitro models which mimic cerebral ischemia. The novel aspect of this study is that changes of the brain blood vessels are studied in addition to neuronal changes and the reaction of both the neuronal compartment and the vascular compartment can be compared and correlated. The methods presented in this protocol substantially broaden the potential applications of the organotypic slice culture approach. The induction of OGD or hypoxia alone can be applied by rather simple means in organotypic slice cultures and leads to reliable and reproducible damage in the neural tissue. This is in stark contrast to the complicated and problematic animal experiments inducing stroke and ischemia in vivo. By broadening the analysis to include the study of the reaction of the vasculature could provide new ways on how to preserve and restore brain functions. The slice culture approach presented here might develop into an attractive and important tool for the study of ischemic brain injury and might be useful for testing potential therapeutic measures aimed at neuroprotection.

A protocol for entorhino-hippocampal organotypic slice cultures, which allows reproducing many aspects of ischemic brain injury, is presented. By studying changes of the neurovasculature in addition to changes in the neurons, this protocol is a versatile tool to study plastic changes in neural tissue after injury.

神经血管重塑的分析Entorhino，海马脑切片培养

Ischemic brain injury is among the most common and devastating conditions compromising proper brain function and often leads to persisting functional ...

Organotypic Hippocampal Slice Cultures As a Model to Study Neuroprotection and Invasiveness of Tumor Cells

In organotypic hippocampal slice cultures (OHSC), the morphological and functional characteristics of both neurons and glial cells are well preserved. This model is suitable for addressing different research questions that involve studies on neuroprotection, electrophysiological experiments on neurons, neuronal networks or tumor invasion. The hippocampal architecture and neuronal activity in multisynaptic circuits are well conserved in OHSC, even though the slicing procedure itself initially lesions and leads to formation of a glial scar. The scar formation alters presumably the mechanical properties and diffusive behavior of small molecules, etc. Slices allow the monitoring of time dependent processes after brain injury without animal surgery, and studies on interactions between various brain-derived cell types, namely astrocytes, microglia and neurons under both physiological and pathological conditions. An ambivalent aspect of this model is the absence of blood flow and immune blood cells. During the progression of the neuronal injury, migrating immune cells from the blood play an important role. As those cells are missing in slices, the intrinsic processes in the culture may be observed without external interference. Moreover, in OHSC the composition of the medium-external environment is precisely controlled. A further advantage of this method is the lower number of sacrificed animals compared to standard preparations. Several OHSC can be obtained from one animal making simultaneous studies with multiple treatments in one animal possible. For these reasons, OHSC are well suited to analyze the effects of new protective therapeutics after tissue damage or during tumor invasion. 
The protocol presented here describes a preparation method of OHSC that allows generating highly reproducible, well preserved slices that can be used for a variety of experimental research, like neuroprotection or tumor invasion studies.

Organotypic hippocampal slice cultures (OHSC) represent an in vitro model that simulates the in vivo situation very well. Here we describe a vibratome-based improved slicing protocol to obtain high quality slices for use in assessing the neuroprotective potential of novel substances or the biological behavior of tumor cells.

器官海马切片培养模型研究肿瘤细胞的神经保护和侵袭性

In organotypic hippocampal slice cultures (OHSC), the morphological and functional characteristics of both neurons and glial cells are well preserved. ...

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

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

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

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

前子宫内胚胎小鼠脑电穿孔和脊髓切片培养迁移 GABAergic 中间神经元的活体成像

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