Name: primer for immunohistochemistry on cryosectioned rat brain tissue: example staining for microglia and neurons
Uploaded: 2015-05-12T13:00:00.000+00:00
Duration: 7 min 30 s
Description: Watch this Scientific Journal Video about Primer for Immunohistochemistry on Cryosectioned Rat Brain Tissue: Example Staining for Microglia and Neurons at JoVE.com

The authors would like to thank Mr. Ryan Hart and Mr. Arriz Lucas for their invaluable feedback on this communication. This work was supported by NIH NINDS R01 NS065052 and Phoenix Children&#8217;s Hospital Mission Support Funds.

注:所有的程序，进行了符合亚利桑那大学的机构动物护理和使用委员会（IACUC）。推荐材料和设备的列表可以在表1中可以找到。 1.组织准备<ol><li>灌注<ol><li>安乐死啮齿类用戊巴比妥钠（25毫克/千克，IP）的过量，并用磷酸盐缓冲盐水（PBS），直到完全放血（3-5分钟）以8毫升/分钟的流速灌流transcardially。为深入灌注说明，请参阅量具等2012 9。 </li><li>紧接的PBS冲洗，通过用在PBS中的4％多聚甲醛以8毫升/分钟的流速灌流15-20分钟修复组织。 </li><li>除去脑并置于4％多聚甲醛24小时，随后经分级蔗糖溶液（15％，30％，30％，在序列;在Tris缓冲盐水中制备的）在4℃下。大脑转移到随后的蔗糖溶液0NLY大脑后已经沉没在每个解决方案。注意:通常，5天中的各溶液是足够的时间进行组织下沉。 </li></ol></li><li>组织冻结和Cryosectioning <ol><li>将脑在包埋介质中，例如OCT化合物中，并在-35℃的温度下浸没在异戊烷。让大脑冻结为至少10分钟，然后储存在​​-80℃。可能会出现问题，如果不采取勤奋温度;请参阅讨论的故障排除信息。 </li><li>切串行冠状切片，厚度为20μm和-20℃的温度下进行。收集到的组织正电荷的幻灯片。脑切片可以被放置在一个滑动箱用铝箔包裹在一个拉链袋中并存储长期在-80℃。存储此方法创建一个双重边界，以防止暴露于空气和霜冻。 </li></ol></li></ol> 2.组织处理注:例如设备和材料研究equired染色示于图3中 。替代是可用的，然而，这些图像将有助于这些新的免疫组织化学染色，以在购买之前可视适当的项目。 <img alt="图3" src="/files/ftp_upload/52293/52293fig3highres.jpg" /> 需要实施例的物品为免疫组织化学染色的黑盒子中的 （A）示出的是一种理想的湿度室中进行免疫荧光，如载玻片避光，而不需要包裹上金属箔的框:图3。以下切片，幻灯片可以存储在一个盒子如黄箱中的（B）所示。紧紧包裹箱箔和冷冻前放置在一个拉链顶袋有助于保护组织样本从冷冻烧伤。幻灯片的示例（C）中，与（D）中示出不同的染色皿和给出（E </strong&gt;）。盖玻片可以在尺寸和厚度（F）各不相同，但1.2厚的盖玻片提供最正直和共聚焦显微镜不错的成像效果。铅笔诸如在（G）中所示，可用于标记的幻灯片。永久标记应避免作为油墨可以运行，既影响染色，并确定所述样品是什么的能力。迷你笔PAP如在（H），使显示的幻灯片上要绘制的边界驱蚊。 <ol><li>幻灯片准备<ol><li>在室温下删除冰柜和解冻的幻灯片。 <ol><li>可选:如果部分已经从幻灯片先前浮起，放置解冻载玻片在烘箱中在60℃下不超过4小时，以帮助防止组织切片从浮脱幻灯片。 </li></ol></li><li>地方幻灯片在幻灯片机架以及相应的菜。 </li><li>洗涤滑入PBS洗3次，每次5分钟，改变洗涤之间溶液。从这一步，避免secti组件没有液体延长的时间周期。注意:如果切片干燥，背景染色增加并且有意义的数据不能可靠地获得。 </li></ol></li><li>组织染色<ol><li>在一个不透光的盒子染色，营造"湿室"与浸泡用去离子水无绒毛组织。 </li><li>干燥，不起毛的组织幻灯片的边缘，使用mini PAP笔做出拒液边框在幻灯片的边缘，远离组织切片。该边界应确保液体的弯液面，并在组织，使得表面张力不影响染色的边缘之间充足的空间。 注:巴氏笔驱蚊边框可以应用之前2.1.3如果感兴趣的抗体并不需要微波抗原修复。如果巴氏笔之前已经在PBS中洗涤应用，则疏液边界的完整性必须在此步骤进行检查。使用一个微型的PAP笔填写在边境的任何空白。 </li><li&gt;用幻灯片水平放置，阻断非特异性抗原孵育在4％V / V血清的PBS（块解决方案）的结合。吸管300微升，在室温下每滑块溶液1小时。确保块溶液延伸至巴氏笔在滑动的边缘，并完全覆盖所述组织，以避免造成邻近组织表面张力不均匀的染色。 <ol><li>从其中的二级抗体是由相同的物种使用血清。注意:在此过程中，二次抗体在驴制成，因而驴血清被使用。如果来自两个或更多不同物种的第二抗体的使用，包括血清来自每个物种。 </li></ol></li><li>吸取第一抗体在载玻片上。注:抗体浓度的这种染色进行了优化，以1:5000和1:500分别为Iba1和泛神经元。这些浓度已经被发现显示出有意义的染色用无背景染色。 <ol><li>稀释块解决方案在PBS 1％血清和添加第一抗体。吸取300微升的主要抗体溶液中每张幻灯片的1％血清。再次，确保流体的巴氏笔的边缘。孵育过夜，在4℃。 </li><li>包括三个控制幻灯片:一个包含既不Iba1也不泛神经元抗体，其中一个Iba1不泛神经元抗体，和一个与泛神经元抗体没有Iba1。在相同的运行具有相同的溶液染色这些幻灯片，但是省略了初级抗体，以测试非特异性次级抗体的结合。 </li></ol></li><li>第二天早晨，洗涤滑入PBS洗3次，每次5分钟，改变洗涤之间溶液。 </li><li>荧光抗体对光敏感，因此，从这个进步，最大限度地减少曝光，确保清洗容器包装在铝箔和杂交框是黑色或避光培养。吸取适当的二级抗体上的所有幻灯片和孵育60分钟在室温下以1:1的浓度:在方框溶液250（见步骤2.2.3）在一个不透光的"湿度箱"（见步骤2.2.1）。 <ol><li>使用不同波长的次级抗体。这里，对于第一抗体兔抗Iba1，用驴抗兔594作为相应的二次抗体。为第一抗体的小鼠抗泛神经元，使用驴抗小鼠488作为相应的二次抗体。或者，使用抗兔488和抗小鼠594。 </li></ol></li><li>洗涤滑入PBS洗3次，每次5分钟。 </li><li>可选:执行核染色。 <ol><li>地方在赫斯特（或其他核染色）以0.03微克/毫升双蒸H 2 O中的浓度为恰好60秒。 </li><li>洗涤滑入PBS洗3次，每次5分钟。 </li></ol></li><li>在双蒸2 0洗。 </li></ol></li><li>盖片<ol><li>盖玻片载玻片用含水封固剂，如氟omount-G或ProlongGold。小心除去用棉签所有的泡沫。 注:其他的安装剂可以使用，但是高的渗透染料之间已注意到一些内盖片的天。 </li><li>用透明指甲油密封边缘，防止部分变干，由于蒸发。允许指甲油干燥在一个不透光的容器中，同时滑动保持平坦，在室温下，然后存储在一个不透光的容器用铝箔包裹在4℃。 </li></ol></li></ol> 3.影像学检查染色组织<ol><li>显微镜<ol><li>让指甲油开始显微镜，这应该发生在一个黑暗的房间前干燥至少一小时。 </li><li>获得使用共焦或研究显微镜用荧光光源和数字照相机附件的显微照片。使用附带的软件，设置曝光每个波长 - 405，488，594 - 分开。注:深入成像指令应可在网上从显微镜制造商。 </li><li>获得在每个通道中的显微照片，而无需移动部分或调整焦点。取的图像的颜色，或交替地以灰度，并转换为颜色之后。 注意:颜色或灰度图像的每个通道都可以在后期处理进行整理。 </li><li>确保组织切片不暴露于环境光或显微镜光为长时间，如将发生光致漂白的部分。为了避免这种情况，增加曝光时间，而不是增加光/激光强度。 </li><li>不内被接通30分钟关掉荧光光源。 注意:切换源通断在快速连续可能降低荧光灯泡的寿命。 </li></ol></li></ol>

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The authors have nothing to disclose.

这种沟通的总体目标是引进免疫程序给读者。为此，双标记与Iba1和泛神经元抗原的例子来观察小胶质细胞和多聚甲醛中的神经元灌注，蔗糖冷冻保护，冰冻切片大鼠脑使用。 这种技术可以适用于服务无休止的目的。不同抗原在多种组织类型，例如但不限于脑，肺，肝，肾和肠的阵列可以免疫组织化学与小幅调整协议被可视化。免疫组织化学允许的多个标记的直接比较，并且?...

<html>免疫组织化学是用于通过使用特异性结合到感兴趣的抗原的第一抗体检测抗原（ 即蛋白）的组织切片的方法。免疫组化法开创的JR马拉克在1934年，当他确定抗体可与很大的特殊性1本地化抗原。在1942年开始，一些先在体外用荧光抗体可视化免疫研究发表2,3，此后，第一体内组织化学研究发表4。在20世纪60年代，经过三十年的免疫组化方法以来，酶标记的抗体开始被用作辅助试剂。这些方法同时并独立开发了法国和美国5,6。如今，抗体的广泛提供了无限的可能性，免疫组化研究7。 "&gt;此对应的总体目标是提供一个简单的介绍到免疫组化染色;它并不意味着是该技术的全面和详尽的审查中列出的方法，免疫组化技术对两种抗原呈现（标记为小胶质细胞和。神经元），用于多聚甲醛的染色灌注，蔗糖冷冻保护，冰冻切片大鼠脑。免疫组织化学染色开始阻断非特异性抗原结合，以减少背景染色。接着，温育与初级抗体允许在组织结合到特定抗原。继第一抗体，另一种抗体，称为二次抗体，被施加到第一抗体链接到一个共轭可视信号8。二级抗体靶向免疫球蛋白G（IgG）的特定于其中初级抗体升高的物种域。二级抗体放大该信号第一抗体的自吨的Fab区他的第二抗体结合到多个站点上的第一抗体的抗体结构域。或者缀合到二级抗体的F c的区域的酶或荧光分子使可视化。例如，兔抗Iba1第一抗体是特异性针对Iba1兔IgG分子。当驴抗兔IgG被作为二次抗体施加，它会识别和结合的兔抗Iba1 IgG抗体的多个区域（ 见图1）。驴抗体可通过各种方法来显示。这种对应着重于检测缀合到二级抗体，其识别第一抗体，用于可视化通过荧光显微镜荧光团。在荧光免疫组织化学，核染色剂如Hoechst的或DAPI可以用于可视化的所有核。 <img alt="图1" src="/files/ftp_upload/52293/52293fig1highres.jpg" /> 图1:SCH的直接与间接的抗体标记技术ematic表示。抗体结合到感兴趣的抗原，并且可以通过产生针对第一抗体的物种的二级抗体进行放大。这种技术可以使用抗生物素蛋白-生物素复合物（ABC）用于扩增和DAB进行可视化（A）中进行，或直接缀合的荧光第二抗体（B）。另外，主要的抗体可直接偶联与许多不同的标记，包括生物素或荧光团（C）。 <a href="https://www.jove.com/files/ftp_upload/52293/52293fig1large.jpg" target="_blank">请点击此处查看该图的放大版本。</a> 对于免疫组织化学染色的可视化的另一种方法是使用3,3&#39;-二氨基联苯胺四盐酸（DAB;参见图1和2）。这不同于荧光通过使用生物素化的或辣根过氧化物酶（HRP）缀合的第二抗体，其提供了一种酶的DAB转换为沉淀物是在亮视野显微镜可见。中的实例，其中一个单一的抗原是感兴趣或染色需要是持久的，DAB可能比荧光染色更合适。然而，DAB染色并不非常适合于多个标记之间的差异，特别是如果两个核抗原的兴趣。关于DAB材料和协议修改的信息，请参阅表1中 。另外，硝基蓝四唑氯化物/ 5-溴-4-氯-3-吲哚磷酸（NBT / BCIP）可以被用于可视化的碱性磷酸酶（AP）缀合的二抗体。 <img alt="图2" src="/files/ftp_upload/52293/52293fig2highres.jpg" /> 图2:镍增强的DAB单标记的大鼠脑组织切片的代表性图像大鼠脑瑟ctions其上标有镍增强DAB的Iba1（A）和泛神经元（B）允许单独或小胶质细胞神经元的长期分析。比例尺20微米。 <a href="https://www.jove.com/files/ftp_upload/52293/52293fig2large.jpg" target="_blank">请点击此处查看该图的放大版本。</a> 必须考虑的组织内感兴趣的抗原的估计的丰度的分析处理。间接的方法（如上所述）可用于具有低丰度的目标是有用的。当感兴趣的抗原是在高丰度，直接的方法都可以应用。直接方法涉及一个直接缀合到一个可视信号的初级抗体，因此没有第二抗体是必需的。此方法简化了染色处理，但消除了间接的方法取得的扩增。使用直接缀合的初级抗体也消除交叉反应的第二抗体的当双标记。 该通信详细介绍了协议双标记与Iba1和泛神经元（ 如表1的细节）。 Iba1小胶质细胞染成许多活化状态，包括分枝，超分枝，激活，变形虫，和杆。泛神经污渍神经轴突，树突和索玛。因为Iba1渍最小胶质细胞和泛神经元靶神经元，污渍的这种组合中获得的小胶质细胞 - 神经元相互作用的广泛了解。 总之，免疫组化染色依赖于精心挑选的抗体。随着研究的问题变得更加具体，提出的到备用抗原抗体可能不理想。要针对特定​​的小胶质细胞激活状态，可以选择使用CD45或CD68抗体，而不是Iba1。此外，与小鼠的工作，F4 / 80可提供必要的结果。同样地，神经元元件可特异性地与抗体ラ针对性反对核ISED，突触（前或后），轴突和生长锥。此外，还有其他的标志物区分神经元（双肾上腺皮质激素，的NeuN）的年龄和神经再生（GAP-43）。

<table><tbody><tr><td>Fisherbrand Superfrost Plus Glass Slides&amp;nbsp;</td><td>Fisher Scientific</td><td>22-034-979</td><td>Used for tissue mounting (1.2.2)</td></tr><tr><td>Oven</td><td>Thermo Scientific</td><td>51028112</td><td>Used for tissue drying (2.1.1)</td></tr><tr><td>Mini Pap pen</td><td>Life Technologies</td><td>00-8877</td><td>Used in step 2.2.2</td></tr><tr><td>Andwin Scientific Tissue-tek Slide Staining Dish</td><td>Fisher Scientific</td><td>22-149-429</td><td>Used for all washes during staining (2.2), as well as the Hoechst step (2.2.8)&amp;nbsp;</td></tr><tr><td>Kimwipes</td><td>Fisher Scientific</td><td>06-666-A</td><td>Used for drying slides (2.2)</td></tr><tr><td>Black Staining Box</td><td>Ted Pella</td><td>21050</td><td>Used for blocking and staining steps (2.2)</td></tr><tr><td>Normal Donkey Serum</td><td>Fisher Scientific</td><td>50-413-253</td><td>Used for block and antibody incubation (2.2)</td></tr><tr><td>Mouse &amp;alpha;-Pan-neuronal</td><td>Millipore</td><td>MAB2300</td><td>Used for primary antibody (2.2.4)</td></tr><tr><td>Rabbit &amp;alpha;-Iba1</td><td>Wako Chemical</td><td>019-19741</td><td>Used for primary antibody (2.2.4)</td></tr><tr><td>Donkey &amp;alpha;-rabbit 594</td><td>Jackson ImmunoResearch</td><td>711-585-152</td><td>Used for secondary antibody (2.2.6)</td></tr><tr><td>Donkey &amp;alpha;-mouse 488</td><td>Jackson ImmunoResearch</td><td>715-545-150</td><td>Used for secondary antibody (2.2.6)</td></tr><tr><td>Caterer&#039;s foil</td><td>Any</td><td>N/A</td><td>Used in steps 1.2.2 and 2.3.2</td></tr><tr><td>Fluoromount-G</td><td>Southern Biotech</td><td>0100-01</td><td>Used for coverslipping (2.2.8)</td></tr><tr><td>Coverslips</td><td>Fisher Scientific</td><td>12544E</td><td>Used for coverslipping (2.2.8)</td></tr><tr><td>Clear Nail Polish&amp;nbsp;</td><td>Any</td><td>N/A</td><td>Used for coverslipping (2.2.8)</td></tr><tr><td>Axio Observer.Z1 and LSM 710 (laser scanning, confocal)</td><td>Carl Zeiss</td><td>N/A</td><td>Used for imaging (3)</td></tr><tr><td>Axioskop A2</td><td>Carl Zeiss</td><td>N/A</td><td>Used for imaging (3)</td></tr><tr><td>CitriSolv&amp;nbsp;</td><td>FisherScientific</td><td></td><td>For DAB protocol</td></tr><tr><td>ABC</td><td>Vector Laboratories</td><td>PK-6100</td><td>For DAB protocol</td></tr><tr><td>DAB Peroxidase kit</td><td>Vector Laboratories</td><td>SK-4100</td><td>For DAB protocol</td></tr><tr><td>Biotinylated horse &amp;alpha;-rabbit IgG</td><td>Vector Laboratories</td><td>BA-1100</td><td>For DAB protocol</td></tr><tr><td>Biotinylated horse &amp;alpha;-mouse IgG</td><td>Vector Laboratories</td><td>BA-2001</td><td>For DAB protocol</td></tr><tr><td>30% Hydrogen Peroxide</td><td>FisherScientific</td><td>H325-500</td><td>For DAB protocol</td></tr><tr><td>Wheaton slide racks and staining dishes</td><td>TedPella</td><td>21043</td><td>For DAB protocol</td></tr><tr><td>Masterflex perfusion pump and tubing</td><td>Cole-Parmer</td><td></td><td>Used for perfusion (1.1.1 and 1.1.2)</td></tr><tr><td>Andwin scientific tissue-tek CRYO-OCT compound (case of 12)</td><td>Fisher Scientific</td><td>14-373-65</td><td>Used for tissue freezing (1.2.1)</td></tr><tr><td>Thermometer (-50 to 50 C)&amp;nbsp;</td><td>Fisher Scientific</td><td>15-059-228</td><td>Used for tissue freezing (1.2.1)</td></tr><tr><td>Cryostat</td><td>Leica&amp;nbsp;</td><td>CM3500S</td><td>Used for tissue sectioning (1.2.2)</td></tr><tr><td>Staining Dish, Plastic with 2 Lids</td><td>Grale Scientific</td><td>353</td><td>For antigen retrival</td></tr><tr><td>20 Place Staining Rack, Slides Horizontal</td><td>Grale Scientific</td><td>354</td><td>For antigen retrival</td></tr><tr><td>Microwave</td><td>Any</td><td>N/A</td><td>For antigen retrival</td></tr></tbody></table>

primer for immunohistochemistry on cryosectioned rat brain tissue: example staining for microglia and neurons

免疫组织化学是一种广泛使用的技术，用于检测的存在，位置和相对原位抗原的丰度。这个入门级协议说明了试剂，设备和完成啮齿动物的脑组织的免疫组织化学染色所需的技术，使用标记的小胶质细胞和神经元的元素作为一个例子。具体地，本文是一步一步的协议，用于小胶质细胞和神经元的通过免疫组织化学对Iba1和泛神经元，分别荧光可视化。荧光双标记是用于在同一样品中多种蛋白的定位是特别有用的，提供的机会，以准确地观察细胞类型，受体，配体之间的相互作用，和/或细胞外基质中相对于彼此以及蛋白质共单个细胞内的定位。不像其他的可视化技术，荧光免疫组化染色强度可能减小在几个星期到几个月之后染色，除非有适当的预防措施。尽管这种限制，在许多应用荧光双标记优于替代品，如3,3&#39;-二氨基联苯胺四盐酸盐（DAB）或碱性磷酸酶（AP），由于荧光是更多的时间效率，并允许两个或更多个之间更加精确的分化标记。讨论包括故障排除提示和建议，以促进成功。

这在大鼠的脑组织切片染色方案的结果已小胶质细胞的荧光标记，在594通道（红色）和神经元标记中的488通道（绿色;参见图4）。如果一个核染色已经完成，它将显示在405通道（蓝色）。图像可以采取不同的通道和覆盖该三个信道的直接比较，或任何两个通道之间。许多数字采集软件套件包含此功能。双标记与这里显示Iba1和泛神经元标记表明大部分分枝小胶质细胞，长细神经元的预?...

Watch this Scientific Journal Video about Primer for Immunohistochemistry on Cryosectioned Rat Brain Tissue: Example Staining for Microglia and Neurons at JoVE.com

Primer for Immunohistochemistry on Cryosectioned Rat Brain Tissue: Example Staining for Microglia and Neurons

This introductory level protocol describes the reagents, equipment, and techniques required to complete immunohistochemical staining of rodent brains, using markers for microglia and neuronal elements as an example.

引物对免疫冰冻切片大鼠脑组织:例为染色小胶质细胞和神经元

Immunohistochemistry is a widely used technique for detecting the presence, location, and relative abundance of antigens in situ. This introductory level ...

primer-for-immunohistochemistry-on-cryosectioned-rat-brain-tissue

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JoVE Journal

Neuroscience

31.9K 次观看.  University of Arizona College of Medicine - Phoenix. This introductory level protocol describes the reagents, equipment, and techniques required to complete immunohistochemical staining of rodent brains, using markers for microglia and neuronal elements as an example. 

视频: Primer for Immunohistochemistry on Cryosectioned Rat Brain Tissue: Example Staining for Microglia and Neurons

Preparation of Mouse Brain Tissue for Immunoelectron Microscopy

Transmission electron microscopy (TEM) is extremely useful for visualizing microglial, oligodendrocytic, astrocytic, and neuronal subcellular compartments (dendrite, dendritic spine, axon, axon terminal, perikaryon), as well as their intracellular organelles and cytoskeleton, in the central nervous system at high spatial resolution. Combined with TEM, pre-embedding immunocytochemistry allows the discrimination of cellular elements with few distinctive features and identification criteria (e.g., microglial perikarya and processes, when using an antibody against the microglia-specific marker Iba1 (ionized calcium binding adaptor molecule 1; as presented here)), identifying the neurotransmitter contents of cellular elements (e.g., serotonergic) and their ultrastructural localization of soluble or membrane-bound proteins (e.g., 5 HT1A and EphA4 receptors). Here, we describe a protocol for transcardiac perfusion of mice with acrolein fixative, removal and sectioning of the brain, as well as immunoperoxidase-diaminobenzidine (DAB) staining, resin embedding, and ultrathin sectioning of the brain sections. Upon completion of these procedures, the immunostained material is ready for examination with TEM. When rigorously performed, this technique provides an excellent compromise between optimal ultrastructural preservation and immunocytochemical detection.

We describe a protocol for transcardiac perfusion of mice, removal and sectioning of the brain, as well as immunoperoxidase staining, resin embedding, and ultrathin sectioning of the brain sections. Upon completion of these procedures, the immunostained material is ready for examination with transmission electron microscopy.

制备小鼠脑组织中的免疫电镜

Transmission electron microscopy (TEM) is extremely useful for visualizing microglial, oligodendrocytic, astrocytic, and neuronal subcellular compartments ...

科研

神经科学

Immunohistochemical Analysis in the Rat Central Nervous System and Peripheral Lymph Node Tissue Sections

Immunohistochemistry (IHC) provides highly specific, reliable and attractive protein visualization. Correct performance and interpretation of an IHC-based multicolor labeling is challenging, especially when utilized for assessing interrelations between target proteins in the tissue with a high fat content such as the central nervous system (CNS).
Our protocol represents a refinement of the standard immunolabeling technique particularly adjusted for detection of both structural and soluble proteins in the rat CNS and peripheral lymph nodes (LN) affected by neuroinflammation. Nonetheless, with or without further modifications, our protocol could likely be used for detection of other related protein targets, even in other organs and species than here presented.

We here present an optimized, detailed protocol for double immunostaining in formalin-fixed, paraffin-embedded rat central nervous system (CNS) and peripheral lymph node (LN) tissue sections.

免疫组化分析大鼠中枢神经系统和周围淋巴结组织切片

Immunohistochemistry (IHC) provides highly specific, reliable and attractive protein visualization. Correct performance and interpretation of an IHC-based ...

Immunostaining of Biocytin-filled and Processed Sections for Neurochemical Markers

Electrophysiological recordings of cells using the patch clamp technique have allowed for the identification of different neuronal types based on firing patterns. The inclusion of biocytin/neurobiotin in the recording electrode permits post-hoc recovery of morphological details, which are necessary to determine the dendritic arborization and the regions targeted by the axons of the recorded neurons. However, given the presence of morphologically similar neurons with distinct neurochemical identities and functions, immunohistochemical staining for cell-type-specific proteins is essential to definitively identify neurons. To maintain network connectivity, brain sections for physiological recordings are prepared at a thickness of 300 &#181;m or greater. However, this thickness often hinders immunohistological postprocessing due to issues with antibody penetration, necessitating the resectioning of the tissue. Resectioning of slices is a challenging art, often resulting in the loss of tissue and morphology of the cells from which electrophysiological data was obtained, rendering the data unusable. Since recovery of morphology would limit data loss and guide in the selection of neuronal markers, we have adopted a strategy of recovering cell morphology first, followed by secondary immunostaining. We introduce a practical approach to biocytin filling during physiological recordings and subsequent serial immunostaining for the recovery of morphology, followed by the restaining of sections to determine the neurochemical identity. We report that sections that were filled with biocytin, fixed with paraformaldehyde (PFA), stained, and coverslipped can be removed and restained with a second primary antibody days later. This restaining involves the removal of the coverslip, the washing of sections in a buffer solution, and the incubation of primary and secondary antibodies to reveal the neurochemical identity. The method is advantageous for eliminating data loss due to an inability to recover morphology and for narrowing down the neurochemical markers to be tested based on morphology.

This protocol presents a method for the morphological recovery of neurons patched during electrophysiological recordings using biocytin filling and subsequent immunohistochemical postprocessing. We show that thick biocytin-filled sections that were stained and coverslipped can be restained with a second primary antibody days&#160;or months later.

对于神经化学标记用biocytin填充和加工部分的免疫染色

Electrophysiological recordings of cells using the patch clamp technique have allowed for the identification of different neuronal types based on firing ...

Immunofluorescence Staining Using IBA1 and TMEM119 for Microglial Density, Morphology and Peripheral Myeloid Cell Infiltration Analysis in Mouse Brain

This is a protocol for the dual visualization of microglia and infiltrating macrophages in mouse brain tissue. TMEM119 (which labels microglia selectively), when combined with IBA1 (which provides an exceptional visualization of their morphology), allows investigation of changes in density, distribution, and morphology. Quantifying these parameters is important in providing insights into the roles exerted by microglia, the resident macrophages of the brain. Under normal physiological conditions, microglia are regularly distributed in a mosaic-like pattern and present a small soma with ramified processes. Nevertheless, as a response to environmental factors (i.e., trauma, infection, disease, or injury), microglial density, distribution, and morphology are altered in various manners, depending on the insult. Additionally, the described double-staining method allows visualization of infiltrating macrophages in the brain based on their expression of IBA1 and without colocalization with TMEM119. This approach thus allows discrimination between microglia and infiltrating macrophages, which is required to provide functional insights into their distinct involvement in brain homeostasis across various contexts of health and disease. This protocol integrates the latest findings in neuroimmunology that pertain to the identification of selective markers. It also serves as a useful tool for both experienced neuroimmunologists and researchers seeking to integrate neuroimmunology into projects.

This protocol describes a step-by-step workflow for immunofluorescent costaining of IBA1 and TMEM119, in addition to analysis of microglial density, distribution, and morphology, as well as peripheral myeloid cell infiltration in mouse brain tissue.

使用IBA1和TMEM119进行小鼠脑微胶质密度、形态学和周围骨髓细胞渗透分析的免疫荧光染色

This is a protocol for the dual visualization of microglia and infiltrating macrophages in mouse brain tissue. TMEM119 (which labels microglia ...

免疫与感染

Using Near-infrared Fluorescence and High-resolution Scanning to Measure Protein Expression in the Rodent Brain

Neuroscience is the study of how cells in the brain mediate various functions. Measuring protein expression in neurons and glia is critical for the study of neuroscience as cellular function is determined by the composition and activity of cellular proteins. In this article, we describe how immunocytochemistry can be combined with near-infrared high-resolution scanning to provide a semi-quantitative measure of protein expression in distinct brain regions. This technique can be used for single or double protein expression in the same brain region. Measuring proteins in this fashion can be used to obtain a relative change in protein expression with an experimental manipulation, molecular signature of learning and memory, activity in molecular pathways, and neural activity in multiple brain regions. Using the correct proteins and statistical analysis, functional connectivity among brain regions can be determined as well. Given the ease of implementing immunocytochemistry in a laboratory, using immunocytochemistry with near-infrared high-resolution scanning can expand the ability of the neuroscientist to examine neurobiological processes at a systems level.

Here, we present a protocol that uses near-infrared dyes in conjunction with immunohistochemistry and high-resolution scanning to assay proteins in brain regions.

近红外荧光和高分辨率扫描测量啮齿类动物大脑中蛋白质的表达

Neuroscience is the study of how cells in the brain mediate various functions. Measuring protein expression in neurons and glia is critical for the study ...

Investigating Drivers of Antireward in Addiction Behavior with Anatomically Specific Single-Cell Gene Expression Methods

Increasing rates of addiction behavior have motivated mental health researchers and clinicians alike to understand antireward and recovery. This shift away from reward and commencement necessitates novel perspectives, paradigms, and hypotheses along with an expansion of the methods applied to investigate addiction. Here, we provide an example: A systems biology approach to investigate antireward that combines laser capture microdissection (LCM) and high-throughput microfluidic reverse transcription quantitative polymerase chain reactions (RT-qPCR). Gene expression network dynamics were measured and a key driver of neurovisceral dysregulation in alcohol and opioid withdrawal, neuroinflammation, was identified. This combination of technologies provides anatomic and phenotypic specificity at single-cell resolution with high-throughput sensitivity and specific gene expression measures yielding both hypothesis-generating datasets and mechanistic possibilities that generate opportunities for novel insights and treatments.

The combination of laser capture microdissection and microfluidic RT-qPCR provides anatomic and biotechnical specificity in measuring the transcriptome in single neurons and glia. Applying creative methods with a system's biology approach to psychiatric disease may lead to breakthroughs in understanding and treatment such as the neuroinflammation antireward hypothesis in addiction.

用解剖学特异性单细胞基因表达方法研究成瘾行为中抗奖励的驱动因素

Increasing rates of addiction behavior have motivated mental health researchers and clinicians alike to understand antireward and recovery. This shift ...

<meta charset="utf8"></head><body>免疫荧光染色研究大鼠 MCAO 卒中模型中的细胞死亡

Evaluating Cell Death Signaling by Immunofluorescence in a Rat Model of Ischemic Stroke

Stroke is a leading cause of death and disability worldwide. Most cases of stroke are ischemic and result from the occlusion of the middle cerebral artery (MCA). Current pharmacological approaches for the treatment of ischemic stroke are limited; therefore, novel therapies providing effective neuroprotection against ischemic injury following stroke are urgently needed. In the brain tissue following ischemic stroke, the area of the ischemic penumbra is salvageable but at risk of progressing to irreversible damage. The penumbral area surrounding the infarcted core is a conceptual target for neuroprotection. Since the blood flow is partially maintained in the penumbral area, neuronal and non-neuronal cells in this area transiently survive after stroke, and these cells that are still viable may be rescued by appropriate medical interventions. Understanding the pathophysiology of the penumbra is important in the development of neuroprotective therapies because the cell death pathways activated in the ischemic penumbra may indicate therapeutic targets, such as RUNX1 and cathepsins. These protein targets functioning as mediators of programmed cell death can be further exploited in translational research. With moderate size and similarity to the human brain, the in vivo rat model of MCA occlusion (MCAO) mimics the human ischemic stroke and offers an applicable tool to investigate the penumbral pathology, examine the cell death signaling, and evaluate the effects of potential targets in the context of MCAO. Here, we describe how to induce MCAO in rats and how to perform immunofluorescence staining for the detection of cell death signaling in the rat brain following MCAO.

<meta charset="utf8"></head><body>通过免疫荧光评估缺血性卒中大鼠模型中的细胞死亡信号

Rat in vivo models are indispensable tools to investigate the pathological mechanisms and therapeutic targets for ischemic stroke. This work will describe performing immunofluorescence staining in infarcted brain slices following middle cerebral artery occlusion (MCAO) in rats.

通过免疫荧光评估缺血性卒中大鼠模型中的细胞死亡信号

Stroke is a leading cause of death and disability worldwide. Most cases of stroke are ischemic and result from the occlusion of the middle cerebral artery ...

Immunohistochemical Staining of Rat Coronal Tissue Cryosections for Microglia and Neurons

<a href='https://app.jove.com/v/52293/primer-for-immunohistochemistry-on-cryosectioned-rat-brain-tissue'>Source: Evilsizor, M. N., et. al., Primer for Immunohistochemistry on Cryosectioned Rat Brain Tissue: Example Staining for Microglia and Neurons. J. Vis. Exp. (2015)</a>This video demonstrates a step-by-step immunohistochemistry staining procedure on cryosectioned rat brain tissue to visualize the spatial arrangement of microglia and neurons.

Source: Evilsizor, M. N., et. al., Primer for Immunohistochemistry on Cryosectioned Rat Brain Tissue: Example Staining for Microglia and Neurons. J. Vis. ...

引物对免疫冰冻切片大鼠脑组织:例为染色小胶质细胞和神经元

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Immunohistochemical Staining of Rat Coronal Tissue Cryosections for Microglia and Neurons