我们感谢澳大利亚的生物资源（加文学院，澳大利亚），生物资源中心（新南威尔士大学澳大利亚）和动物护理和伦理委员会与动物实验的支持。这项工作是由澳大利亚国家卫生和医学研究理事会（计划资助APP1062720）的支持。塞萨尔P.卡纳莱斯博士是CONICYT-Becas智利奖学金（＃72101076）的接受者。 Akladios的Bassem先生是澳大利亚新南威尔士大学国际研究生奖的获得者。

伦理学声明:所有涉及动物主题程序遵循的动物护理和伦理委员会（ACEC）在新南威尔士大学澳大利亚的批准下ACEC协议13 / 64B的准则。 1.透明小鼠皮肤组织的制备注意:在本研究中使用的所有小鼠在C57BL / 6遗传背景<ol><li>小鼠皮肤组织的集合。 <ol><li>入道安乐死颈椎脱位小鼠。 </li><li>小心地从与微调，注意不要伤到皮肤相关的皮肤区域中删除毛发。 </li><li>清洗皮肤与磷酸盐缓冲液（PBS）70％乙醇消毒。 </li><li>提起背颈部皮肤钳，使切口，用剪刀。 </li><li>背解剖老鼠的皮肤（约1.5×4厘米）的大面积。 </li><li>展平皮肤真皮面朝下放在滤纸上，并记下样品的前后方向。 </li><li>三周围的解剖皮肤μm过滤纸，并将其放置在15ml试管填充有在PBS新鲜制备的4％低聚甲醛（PFA）的解决方案。 </li><li>在4℃的冰箱中固定1小时，在室温下，或过夜。 </li><li>洗涤皮肤2×5分钟的PBS在15毫升管。 注:以下（1.1.10 - 1.1.12）是组织的长期存储可选步骤。 </li><li>脱水在PBS解剖皮肤中在室温下1小时的洗涤步骤在15毫升管增加的乙醇（25％，50％70％）的浓度。 </li><li>在4℃储存于PBS 70％乙醇15毫升管缺水的肌肤，直到进一步使用。 </li><li>结算前4小时，再水合的皮肤组织在PBS中于室温下1小时的洗涤步骤减小的在一个15毫升管乙醇（70％，50％，25％，0％）的浓度。 </li></ol></li><li>清除小鼠皮肤活检<ol><li> 3.85克尿素3.85克的N-，N，N-溶解准备CUBIC1结算解决方案&#39;，N&#39;N&#39;-四（2-羟丙基）乙二胺在5.38毫升上设置为60的加热器蒸馏水 - 70℃。用热搅拌器。 </li><li>添加2.31克聚乙二醇单对异辛基苯基醚/的Triton X-100的溶液，一旦它是明确的，冷却到室温。 </li><li>切开小鼠皮肤用锋利的剃刀刀片成尺寸约为0.2×0.5厘米活检，并在5毫升在一个15毫升管CUBIC1结算溶液淹没。为了优化毛囊的可视化，确保了活检的较长侧沿试样的前 - 后方向切割。 </li><li>放置在37℃下在杂交烘箱的旋转平台上。 </li><li> 7天之后更改结算解决方案。准备使用前新鲜CUBIC1解决方案。 </li><li>入住后7日内组织的透明度。如果有必要，离开活检CUBIC1结算解决方案，直到组织是完全透明的。 </li><li>一旦皮肤活检是透明的，除去CUBIC1溶液，并加入4毫升1-×PBS中洗涤组织4次6小时于37℃。 </li><li>在37℃下洗皮肤组织在20％重量/在PBS V蔗糖在一个15毫升管4小时。 </li><li>冻结在-80℃冷冻过夜在15ml管安装平台最佳切削温度（OCT）化合物的组织。 注意:此步骤会增加活检的渗透率为在后续步骤中抗体的渗透。 </li></ol></li></ol> 2.免疫荧光染色<ol><li>解冻从1.2.9组织），以室温下搅拌2 - 3小时。 </li><li>在15ml试管用5毫升的PBS 8小时，在室温下洗涤​​组织以除去OCT化合物。 </li><li>转印活检到2ml的管中，并孵育在1ml兔抗Keratin14或兔抗Ki67抗体组织，无论稀释1:在PBST（PBS + 0.1％的Triton-X100）在37 100 3天在振荡器上°℃烘箱。 </li><li>转印活检到15毫升管中，一个第二洗组织4次，6小时在5毫升的PBST振荡器上在37℃的烘箱。 </li><li>在37℃的烘箱在PBST 100和孵育3天振荡器上:转印活检到2ml的管中，加入1 ml的抗 - 兔Alexa594稀释的二级抗体。 </li><li>转印活检到15毫升管中，并洗净组织4次，6小时在PBST 5毫升振荡器上在37℃的烘箱。 </li><li>转印活检到2ml的管中，加入1 ml 4&#39;，6-二脒基-2-苯基吲哚（DAPI）核染剂溶液（1:1,000）在PBST和在37℃的烘箱振荡器上孵育过夜。 </li><li>除去DAPI复染溶液，和1ml的PBST加至2毫升管洗组织4次6小时在摇床上在37℃的烘箱。 注意:可选步骤:活检可以存储在黑暗中在1×PBS中的0.02％叠氮化钠，至少3周。 </li></ol> 3.尼罗红染色<ol><li>溶解在二甲基亚砜（DMSO）尼罗红粉末1μm的最终浓度克/毫升</li><li>加入1μl尼罗红溶液到1ml PBS中至1微克/毫升的最终浓度。 </li><li>从1.2.9解冻组织），以室温下搅拌2 - 3小时，并用5ml PBS洗涤，在室温下8小时。 </li><li>转移活检到2ml的管中，并在1ml尼罗红染色溶液淹没组织在室温下2.5小时。 </li><li>洗2毫升管的皮肤活检用1ml PBST 4次在室温下30分钟。 </li><li>除去从2毫升管的PBST溶液，加入1毫升的DAPI核复染溶液（1:1,000）在PBST，在室温下孵育过夜。 </li><li>除去DAPI复染溶液，并在2毫升管中添加的PBST 1毫升洗皮肤组织4次在室温下6小时。 注意:可选步骤:活检可以存储在黑暗中在1×PBS中的0.02％叠氮化钠，至少3周。 </li></ol> 4.成像<ol><li>准备CUBIC2结算解决方案，其中包含50个％（重量/体积）蔗糖，25％（重量/体积）脲，10％（重量/体积）2,2&#39;，2&#39;&#39; - nitrilotriethanol和0.1％（体积/体积）的Triton X-100。 </li><li>孵育在37℃的烘箱中进行24小时的摇床上，在2毫升管1毫升CUBIC2溶液的皮肤组织。此步骤将连组织的折射率。 </li><li>检查组织的清晰度。一旦它是清楚的，在整个皮肤活检（0.2×0.5厘米）在其长边放置到玻璃盖玻片，使得毛囊的长度方向平行于盖玻片表面（＃1 24×60毫米） 注:可选步骤:抗体染色切片可以存储在CUBIC2溶液中约7天。尼罗红染色的活检只能存储在1天CUBIC2溶液，并应尽快成像。 </li><li>制备成像室（ 图1） 注:成像室的准备所需耗材主要有:蓝色粘性，玩面团或相似，且2盖玻片（24×50毫米）（Figure 1A）。 <ol><li>制备蓝色粘性的两个薄带（直径约1mm×2厘米），和两个盖玻片（ 图1B）。 </li><li>放置在一个盖玻片蓝色钉条，允许皮肤活检（ 图1C）足够的空间。 4.4.3） </li><li>放置皮肤活检中条之间关于在CUBIC2溶液滴（ 图1C）的盖玻片。 </li><li>覆盖皮肤活检与第二盖玻片（ 图1D）。 </li></ol></li><li>与安装的皮肤活检成像室放置到共聚焦显微镜的阶段，移动组织进入光通道。 </li><li>扫描用水银或卤素光源和标准表面荧光过滤器（ 例如，DAPI / GFP / CY3 / CY5）识别感兴趣荧光染色区样品。 </li><li>使用10X和20X物镜（NA 0.75）和标准共聚焦荧光成像技术（ 例如 ，与DA感兴趣图像区域PI染色样品照亮有405nm激光器和收集425之间的荧光信号 - 475纳米，并用的Alexa Fluor 594或尼罗红染色的样品照射与561纳米的激光，并收集570之间的荧光信号 - 620纳米）。 </li><li>生成的使用显微镜Z堆叠图像采集软件每个关心区域的图像的Z堆叠（ 例如 ，使用NIS元件成像软件4.13如下所述）。 <ol><li>确保最佳的激光功率和PMT HV /偏移设置已经选定，收集样品荧光。 </li><li>从"采集控制"打开"ND采集"工具栏。 </li><li>选择"Z系列设置"选项卡（确保所有其他选项卡选择）。 </li><li>虽然现场扫描，聚焦到样品的顶部，然后按"顶部"按钮。 </li><li>聚焦到样品的底部，然后按"底部"按钮。 </li><li>输入所需的步长（或按优化步长按钮）。 </li><li>预SS的"立即运行"按钮。 </li><li>保存生成的Z-堆栈作为单独的TIFF图像堆栈（每图像Z堆栈1荧光染料）。 </li></ol></li><li>使用图像的Z堆栈重建的使用三维分析软件感兴趣的3D体积的区域（ 例如 ，使用如下所述了Imaris 7.2.3 64位）。 <ol><li>启动分析软件。 </li><li>在工具栏的三维体积代选择"超越"按钮。 </li><li>敞开的第一彩色图象Z堆叠（ 例如 ，DAPI）。 </li><li>使用"添加频道"工具来添加额外的颜色通道，每个荧光染料一个通道。因而含有DAPI和Alexa Fluor 594的荧光的样本将需要两个信道。 </li><li>使用"图片属性"工具来设置正确的像素（像素），尺寸（XYZ），在4.7以上决定。 </li><li>根据需要使用"显示调整"工具来改变颜色通道（如 DAPI通道设置为蓝色，的Alexa Fluor 594通道，红色）。 </li><li>宝习得在图像窗口中的3D体积，使用计算机鼠标根据需要点击并拖动音量。 </li><li>在工具栏中使用"快照"工具来生成3D图像的屏幕截图。 </li><li>在工具栏中使用"动画"工具来生成3D样本轮换的电影。 </li></ol></li></ol>

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控制皮肤发育和稳态的调节机制是最常见的2D采用组织切片和组织染色标记的抗体，它能使皮肤只形态，细胞群或蛋白表达的限制升值的影响。许多方法已被开发，以改善细胞和蛋白质中的单细胞分辨率的空间组织的可视化在表皮整体坐骑三月10日至13日的尺寸。其中的一些但涉及从真皮，这在技术上是挑战性的表皮层的分离特别是在使用有毛皮肤，并经常导致毛囊的组织损伤和破裂。而?...

皮肤是我们的生存至关重要。它由三个主要层的外表皮，真皮​​和皮下组织。表皮是一个高度可再生的组织。这是一个鳞状复层上皮，主要由角质形成细胞。角质形成细胞诞生于基底层，并通过基底层向上移动，而差异化，最终他们在他们出生后一个月外角化层脱落。表皮开发了一些附加物，包括毛囊和皮脂腺。毛囊也再生以循环的方式在整个生命1。表皮的再生能力是由位于滤泡表皮和毛囊2基底层干细胞和祖细胞的存在使能。 许多信号传导途径已牵涉在表皮发育和再生。其中的一些发生内仅表皮，如Hedgehog通路。其他信号事件采取真皮和表皮3之间。例如，从真皮的Wnt信号被认为是对毛囊发育重要的，它们是由毛乳头在生长期激活的发作分泌毛囊膨出干/祖细胞的增殖和毛囊生长4。要明白，控制表皮发育和再生，以便更好地理解它们是如何可能在再生皮肤疾病被扰动如皮肤癌的细胞和分子机制是很重要的。 本文介绍了一个C李尔，U nobstructed 乙雨我 maging鸡尾酒和C omputational分析（立方）协议5-7澄清整装皮肤的准备，并在激光共聚焦显微镜单细胞分辨率的3维可视化表达模式。三次方法涉及皮肤浸泡组织中的两个基于氨基醇化学鸡尾酒。这些解决方案调整皮肤样品中的折射率，而使组织透明和蛋白质的完整，从而允许在单细胞分辨率的免疫检测。 在滤泡表皮和毛囊使用该立方协议，基底和增殖角化细胞种群在使用抗Keratin14（K14）和抗Ki67抗体野生型小鼠的全层皮肤活检成像。在野生型皮肤活检皮脂腺用尼罗红染色也观察。最后，在野生型和增生YAP2-5SA-ΔC皮肤活检的基部角质细胞群体进行比较8。 这一立方协议允许在单细胞分辨率的全层皮肤活检蛋白表达的视觉评估，并以欣赏的转基因皮肤表皮的解剖和形态缺陷的重要工具小鼠，并调查表皮发育和再生基础的细胞和分子机制。

<table><tbody><tr><td>Paraformaldehyde</td><td>Sigma-Aldrich&amp;nbsp;</td><td>P6418</td><td></td></tr><tr><td>Ethanol 96% (undenaturated)</td><td>Chem-supply</td><td>UN1170</td><td></td></tr><tr><td>Nile Red</td><td>Sigma-Aldrich&amp;nbsp;</td><td>72485-100MG</td><td></td></tr><tr><td>4&amp;rsquo;,6-diamidino-2-phenylindole (DAPI)</td><td>Roche</td><td>10236276001</td><td></td></tr><tr><td>&lt;em&gt;N,N,N&amp;rsquo;,N&amp;rsquo;&lt;/em&gt;-tetrakis (2-hydroxypropyl) ethylenediamine</td><td>Merck Millipore</td><td>821940</td><td></td></tr><tr><td>Polyethylene glycol mono-p-isooctylphenyl ether</td><td>Merck Millipore</td><td>648462</td><td></td></tr><tr><td>Triton X-100</td><td>Merck Millipore</td><td>648462</td><td></td></tr><tr><td>Sucrose</td><td>Sigma-Aldrich&amp;nbsp;</td><td>S0389</td><td></td></tr><tr><td>Optimal Cutting Temperature (OCT) Compound</td><td>Tissue-Tek</td><td>4583</td><td></td></tr><tr><td>anti-Keratin14 antibody</td><td>Covance</td><td>PRB-155P</td><td></td></tr><tr><td>anti-Ki67 antibody&amp;nbsp;</td><td>Abcam</td><td>ab16667</td><td></td></tr><tr><td>Donkey anti-rabbit Alexa 594</td><td>Life Technologies</td><td>A21207</td><td></td></tr><tr><td>Dimethylsulfoxide</td><td>Sigma-Aldrich&amp;nbsp;</td><td>D2650</td><td></td></tr><tr><td>Urea</td><td>Merck Millipore</td><td>66612</td><td></td></tr><tr><td>2,2&amp;prime;,2&amp;prime;&amp;rsquo;-nitrilotriethanol</td><td>Merck Millipore</td><td>137002</td><td></td></tr><tr><td>Confocal Microscope</td><td>Nikon Instruments Inc</td><td>Nikon A1 - Confocal Microscope</td><td></td></tr><tr><td>cruZer6 Face Trimmer</td><td>Braun</td><td>Braun cruZer6 Face</td><td></td></tr><tr><td>Sodium azide</td><td>Sigma-Aldrich&amp;nbsp;</td><td>438456</td><td></td></tr></tbody></table>

cubic protocol visualizes protein expression at single cell resolution in whole mount skin preparations

皮肤是我们的生存至关重要。外表皮层由滤泡表皮，这是覆盖最我们的身体，和表皮附属物的复层鳞状上皮，例如毛囊和汗腺。表皮经历整个生命，并且响应于损伤的再生。这是通过K14表达被紧紧由表皮内和表皮和真皮之间活动多调节机制调节基底表皮干细胞/祖细胞群启用。本文介绍了一种简单的方法来阐明全层小鼠皮肤活检，和可视化K14蛋白的表达模​​式，Ki67的标记的增殖细胞，尼罗红标记的皮脂腺细胞，并在3D单细胞分辨率DAPI细胞核标记。这种方法可以准确的评估和皮肤的解剖学和病理学的量化，并在转基因小鼠品系的表皮异常表型。立方协议是日E，可到目前为止，调查在单细胞分辨率的全层皮肤活检的分子和细胞相互作用最好的方法。

成年野生型小鼠的全层背部皮肤活检进行了澄清，与抗体结合基础角质标记Keratin14（K14）染色，细胞核复染用DAPI染色溶液（ 图2和电影1）。 DAPI阳性细胞核整个样品（ 图2A，C）是可见的，和K14染色只在滤泡表皮的单细胞厚基底层是可见的，并概述皮脂腺（黑星号），外根鞘毛囊，和在二次发病菌（ 图2B，C）中 ，如先前所发...

Watch this Scientific Journal Video about CUBIC Protocol Visualizes Protein Expression at Single Cell Resolution in Whole Mount Skin Preparations at JoVE.com

CUBIC Protocol Visualizes Protein Expression at Single Cell Resolution in Whole Mount Skin Preparations

这份报告描述了三次协议，以澄清全层小鼠皮肤活检，并在3D单细胞分辨率的可视化表达方式，增殖细胞，皮脂腺细胞和。这种方法使皮肤的解剖学和病理学的准确评估，并在转基因小鼠品系的表皮异常表型。

CUBIC协议可视化在全山皮肤配方单细胞分辨率蛋白表达

The skin is essential for our survival. The outer epidermal layer consists of the interfollicular epidermis, which is a stratified squamous epithelium ...

cubic-protocol-visualizes-protein-expression-at-single-cell

Research

JoVE Journal

Biology

11.5K 次观看.  University of New South Wales Australia. 这份报告描述了三次协议，以澄清全层小鼠皮肤活检，并在3D单细胞分辨率的可视化表达方式，增殖细胞，皮脂腺细胞和。这种方法使皮肤的解剖学和病理学的准确评估，并在转基因小鼠品系的表皮异常表型。 

视频: CUBIC Protocol Visualizes Protein Expression at Single Cell Resolution in Whole Mount Skin Preparations

Horizontal Whole Mount: A Novel Processing and Imaging Protocol for Thick, Three-dimensional Tissue Cross-sections of Skin

Processing a tissue of interest to generate a microscopic image that supports a scientific argument can be challenging. The acquisition of high-quality microscopic images is not entirely dependent upon the quality of the microscope, but also upon the methods of tissue processing, which often involve multiple critical actions or steps. Furthermore, mesenchymal cell types in the skin and other tissues represent a new challenge for tissue preparation and imaging. Here, we present a complete process, from tissue harvest to microscopy. Our technique, called &#34;horizontal whole mount,&#34; is one that novices can quickly become proficient in and that allows for antigen preservation and detection in 60-300 &#181;m-thick sections cut with a cryostat. Sections of this thickness provide enhanced visualization of tissue microarchitecture in a three-dimensional environment. In addition, the protocol preserves mesenchymal cells in a manner that enhances image quality when compared to standard cryostat or paraffin sections, thereby increasing the efficacy and reliability of immunostaining. We believe that this protocol will benefit all laboratories that visualize skin, and possibly other tissues and organs.

This work presents a novel processing and imaging protocol for thick, three-dimensional tissue cross-section analysis that enables the full exploitation of confocal imaging modalities. This protocol preserves antigenicity and represents a robust system to analyze skin histology and potentially other tissue types.

水平整体安装:厚三维组织横截面皮肤的新型加工和成像方案

Processing a tissue of interest to generate a microscopic image that supports a scientific argument can be challenging. The acquisition of high-quality ...

科研

发育生物学

Visualizing Multiciliated Cells in the Zebrafish Through a Combined Protocol of Whole Mount Fluorescent In Situ Hybridization and Immunofluorescence

In recent years, the zebrafish embryo has emerged as a popular model to study developmental biology due to traits such as ex utero embryo development and optical transparency. In particular, the zebrafish embryo has become an important organism to study vertebrate kidney organogenesis as well as multiciliated cell (MCC) development. To visualize MCCs in the embryonic zebrafish kidney, we have developed a combined protocol of whole-mount fluorescent in situ hybridization (FISH) and whole mount immunofluorescence (IF) that enables high resolution imaging. This manuscript describes our technique for co-localizing RNA transcripts and protein as a tool to better understand the regulation of developmental programs through the expression of various lineage factors.

Visualizing Multiciliated Cells in the Zebrafish Through a Combined Protocol of Whole Mount Fluorescent In Situ Hybridization and Immunofluorescence

Cilia development is vital to proper organogenesis. This protocol describes an optimized method to label and visualize ciliated cells of the zebrafish.

全贴装荧光原位杂交和免疫荧光法在斑马鱼中 Multiciliated 细胞的可视化

In recent years, the zebrafish embryo has emerged as a popular model to study developmental biology due to traits such as ex utero embryo development and ...

Spatial Profiling of Protein and RNA Expression in Tissue: An Approach to Fine-Tune Virtual Microdissection

Multiplexing enables the assessment of several markers on the same tissue while providing spatial context. Spatial Omics technologies allow both protein and RNA multiplexing by leveraging photo-cleavable oligo-tagged antibodies and probes, respectively. Oligos are cleaved and quantified from specific regions across the tissue to elucidate the underlying biology. Here, the study demonstrates that automated custom antibody visualization protocols can be utilized to guide ROI selection in conjunction with spatial proteomics assays. This specific method did not show acceptable performance with spatial transcriptomics assays. The protocol describes the development of a 3-plex immunofluorescent (IF) assay for marker visualization on an automated platform, using tyramide signal amplification (TSA) to amplify the fluorescent signal from a given protein target and increase the antibody pool to choose from. The visualization protocol was automated using a thoroughly validated 3-plex assay to ensure quality and reproducibility. In addition, the exchange of DAPI for SYTO dyes was evaluated to allow imaging of TSA-based IF assays on the spatial profiling platform. Additionally, we tested the ability of selecting small ROIs using the spatial transcriptomics assay to allow the investigation of highly-specific areas of interest (e.g., areas enriched for a given cell type). ROIs of 50 &#181;m and 300 &#181;m diameter were collected, which corresponds to approximately 15 cells and 100 cells, respectively. Samples were made into libraries and sequenced to investigate the capability to detect signals from small ROIs and profile-specific regions of the tissue. We determined that spatial proteomics technologies highly benefit from automated, standardized protocols to guide ROI selection. While this automated visualization protocol was not compatible with spatial transcriptomics assays, we were able to test and confirm that specific cell populations can successfully be detected even in small ROIs with the standard manual visualization protocol.

Here, we describe a protocol for fine-tuning regions of interest (ROIs) for Spatial Omics technologies to better characterize the tumor microenvironment and identify specific cell populations. For proteomics assays, automated customized protocols can guide ROI selection, while transcriptomics assays can be fine-tuned utilizing ROIs as small as 50 &#181;m.

组织中蛋白质和RNA表达的空间分析:一种微调虚拟显微切割的方法

Multiplexing enables the assessment of several markers on the same tissue while providing spatial context. Spatial Omics technologies allow both protein ...

癌症研究

Visualizing Single Molecular Complexes In Vivo Using Advanced Fluorescence Microscopy

Full insight into the mechanisms of living cells can be achieved only by investigating the key processes that elicit and direct events at a cellular level. To date the shear complexity of biological systems has caused precise single-molecule experimentation to be far too demanding, instead focusing on studies of single systems using relatively crude bulk ensemble-average measurements. However, many important processes occur in the living cell at the level of just one or a few molecules; ensemble measurements generally mask the stochastic and heterogeneous nature of these events. Here, using advanced optical microscopy and analytical image analysis tools we demonstrate how to monitor proteins within a single living bacterial cell to a precision of single molecules and how we can observe dynamics within molecular complexes in functioning biological machines. The techniques are directly relevant physiologically. They are minimally-perturbative and non-invasive to the biological sample under study and are fully attuned for investigations in living material, features not readily available to other single-molecule approaches of biophysics. In addition, the biological specimens studied all produce fluorescently-tagged protein at levels which are almost identical to the unmodified cell strains ("genomic encoding"), as opposed to the more common but less ideal approach for generating significantly more protein than would occur naturally ('plasmid expression'). Thus, the actual biological samples which will be investigated are significantly closer to the natural organisms, and therefore the observations more relevant to real physiological processes.

Visualizing Single Molecular Complexes In Vivo Using Advanced Fluorescence Microscopy

Here we demonstrate the protocols for performing single-molecule fluorescence microscopy on living bacterial cells to enable functional molecular complexes to be detected, tracked and quantified.

可视化单分子络合物在体内使用高级荧光显微

Full insight into the mechanisms of living cells can be achieved only by investigating the key processes that elicit and direct events at a cellular ...

生物学

Isolation and Staining of Mouse Skin Keratinocytes for Cell Cycle Specific Analysis of Cellular Protein Expression by Mass Cytometry

The goal of this protocol is to detect and quantify protein expression changes in a cell cycle-dependent manner using single cells isolated from the epidermis of mouse skin. There are seven important steps: separation of the epidermis from the dermis, digestion of the epidermis, staining of the epidermal cell populations with cisplatin, sample barcoding, staining with metal tagged antibodies for cell cycle markers and proteins of interest, detection of metal-tagged antibodies by mass cytometry, and the analysis of expression in the various cell cycle phases. The advantage of this approach over histological methods is the potential to assay the expression pattern of &#62;40 different markers in a single cell at different phases of the cell cycle. This approach also allows for the multivariate correlation analysis of protein expression that is more quantifiable than histological/imaging methods. The disadvantage of this protocol is that a suspension of single cells is needed, which results in the loss of location information provided by the staining of tissue sections. This approach may also require the inclusion of additional markers to identify different cell types in crude cell suspensions. The application of this protocol is evident in the analysis of hyperplastic skin disease models. Moreover, this protocol can be adapted for the analysis of specific sub-type of cells (e.g., stem cells) by the addition of lineage-specific antibodies. This protocol can also be adapted for the analysis of skin cells in other experimental species.

This protocol describes how to isolate skin keratinocytes from mouse models, to stain with metal-tagged antibodies, and to analyze stained cells by mass cytometry in order to profile the expression pattern of proteins of interest in the different cell cycle phases.

小鼠皮肤角质细胞的分离和染色,用于细胞周期特定分析细胞蛋白表达的量度细胞测定

The goal of this protocol is to detect and quantify protein expression changes in a cell cycle-dependent manner using single cells isolated from the ...

Improving 2D and 3D Skin In Vitro Models Using Macromolecular Crowding

The glycoprotein family of collagens represents the main structural proteins in the human body, and are key components of biomaterials used in modern tissue engineering. A technical bottleneck is the deposition of collagen in vitro, as it is notoriously slow, resulting in sub-optimal formation of connective tissue and subsequent tissue cohesion, particularly in skin models. Here, we describe a method which involves the addition of differentially-sized sucrose co-polymers to skin cultures to generate macromolecular crowding (MMC), which results in a dramatic enhancement of collagen deposition. Particularly, dermal fibroblasts deposited a significant amount of collagen I/IV/VII and fibronectin under MMC in comparison to controls.
The protocol also describes a method to decellularize crowded cell layers, exposing significant amounts of extracellular matrix (ECM) which were retained on the culture surface as evidenced by immunocytochemistry. Total matrix mass and distribution pattern was studied using interference reflection microscopy. Interestingly, fibroblasts, keratinocytes and co-cultures produced cell-derived matrices (CDM) of varying composition and morphology. CDM could be used as &#34;bio-scaffolds&#34; for secondary cell seeding, where the current use of coatings or scaffolds, typically from xenogenic animal sources, can be avoided, thus moving towards more clinically relevant applications.
In addition, this protocol describes the application of MMC during the submerged phase of a 3D-organotypic skin co-culture model which was sufficient to enhance ECM deposition in the dermo-epidermal junction (DEJ), in particular, collagen VII, the major component of anchoring fibrils. Electron microscopy confirmed the presence of anchoring fibrils in cultures developed with MMC, as compared to controls. This is significant as anchoring fibrils tether the dermis to the epidermis, hence, having a pre-formed mature DEJ may benefit skin graft recipients in terms of graft stability and overall wound healing. Furthermore, culture time was condensed from 5 weeks to 3 weeks to obtain a mature construct, when using MMC, reducing costs.

Improving 2D and 3D Skin In Vitro Models Using Macromolecular Crowding

We present a protocol to obtain cell-derived matrices rich in extracellular matrix proteins, using macromolecular crowders (MMC). In addition, we present a protocol which incorporates MMC in 3D organotypic skin co-culture generation, which reduces culture time while maintaining maturity of construct.

提高2D和3D皮肤<em&gt;体外</em&gt;模型使用大分子拥挤

The glycoprotein family of collagens represents the main structural proteins in the human body, and are key components of biomaterials used in modern ...

生物工程

In Vivo Two-Color 2-Photon Imaging of Genetically-Tagged Reporter Cells in the Skin

Fibroblasts are mesenchymal cells that change their morphology upon activation, ultimately influencing the microenvironment of the tissue they are located in. Although traditional imaging techniques are useful in identifying protein interactions and morphology in fixed tissue, they are not able to give insight as to how quickly cells are able to bind and uptake proteins, and once activated how their morphology changes in vivo. In the present study, we ask 2 major questions: 1) what is the time-course of fibroblast activation via toll-like receptor-4 (TLR4) and lipopolysaccharide (LPS) interaction and 2) how do these cells behave once activated? Using 2-photon imaging, we have developed a novel technique to assess the ability of LPS-FITC to bind to its cognate receptor, TLR4, expressed on peripheral fibroblasts in the genetic reporter mouse line; FSP1cre; tdTomatolox-stop-lox&#160;in vivo. This unique approach allows researchers to create in-depth, time-lapse videos and/or pictures of proteins interacting with live cells that allows one to have an increased level of granularity in understanding how proteins can alter cellular behavior.

Morphological changes occur in immune responsive fibroblast cells following activation and promote alterations in cellular recruitment. Utilizing 2-photon imaging in conjunction with a genetically engineered Fibroblast-specific protein 1 (FSP1)-cre; tdTomato floxed-stop-floxed (TB/TB) mouse line and green fluorescently tagged lipopolysaccharide-FITC, we can illustrate highly specific uptake of lipopolysaccharide in dermal fibroblasts and morphological changes in vivo.

在 Vivo 双色 2 光子成像中,基因标记报告器细胞在皮肤中

Fibroblasts are mesenchymal cells that change their morphology upon activation, ultimately influencing the microenvironment of the tissue they are located ...

Light-sheet Microscopy for Three-dimensional Visualization of Human Immune Cells

In vivo, activation, proliferation, and function of immune cells all occur in a three-dimensional (3D) environment, for instance in lymph nodes or tissues. Up to date, most in vitro systems rely on two-dimensional (2D) surfaces, such as cell-culture plates or coverslips. To optimally mimic physiological conditions in vitro, we utilize a simple 3D collagen matrix. Collagen is one of the major components of extracellular matrix (ECM) and has been widely used to constitute 3D matrices. For 3D imaging, the recently developed light-sheet microscopy technology (also referred to as single plane illumination microscopy) is featured with high acquisition speed, large penetration depth, low bleaching, and photocytotoxicity. Furthermore, light-sheet microscopy is particularly advantageous for long-term measurement. Here we describe an optimized protocol how to set up and handle human immune cells, e.g. primary human cytotoxic T lymphocytes (CTL) and natural killer (NK) cells in the 3D collagen matrix for usage with the light-sheet microscopy for live cell imaging and fixed samples. The procedure for image acquisition and analysis of cell migration are presented. A particular focus is given to highlight critical steps and factors for sample preparation and data analysis. This protocol can be employed for other types of suspension cells in a 3D collagen matrix and is not limited to immune cells.

Here, we present a protocol to visualize immune cells embedded in a three-dimensional (3D) collagen matrix using light-sheet microscopy. This protocol also elaborates how to track cell migration in 3D. This protocol can be employed for other types of suspension cells in the 3D matrix.

三维人体免疫细胞可视化的光片显微术

In vivo, activation, proliferation, and function of immune cells all occur in a three-dimensional (3D) environment, for instance in lymph nodes or ...

免疫与感染

Staining and High-Resolution Imaging of Three-Dimensional Organoid and Spheroid Models

In vitro three-dimensional (3D) cell culture models, such as organoids and spheroids, are valuable tools for many applications including development and disease modeling, drug discovery, and regenerative medicine. To fully exploit these models, it is crucial to study them at cellular and subcellular levels. However, characterizing such in vitro 3D cell culture models can be technically challenging and requires specific expertise to perform effective analyses. Here, this paper provides detailed, robust, and complementary protocols to perform staining and subcellular resolution imaging of fixed in vitro 3D cell culture models ranging from 100 &#181;m to several millimeters. These protocols are applicable to a wide variety of organoids and spheroids that differ in their cell-of-origin, morphology, and culture conditions. From 3D structure harvesting to image analysis, these protocols can be completed within 4-5 days. Briefly, 3D structures are collected, fixed, and can then be processed either through paraffin-embedding and histological/immunohistochemical staining, or directly immunolabeled and prepared for optical clearing and 3D reconstruction (200 &#181;m depth) by confocal microscopy.

Here, we provide detailed, robust, and complementary protocols to perform staining and subcellular resolution imaging of fixed three-dimensional cell culture models ranging from 100 &#181;m to several millimeters, thus enabling the visualization of their morphology, cell-type composition, and interactions.

三维类器官和球状体模型的染色和高分辨率成像

In vitro three-dimensional (3D) cell culture models, such as organoids and spheroids, are valuable tools for many applications including development and ...

CUBIC-based Protein Expression Visualization: A Procedure for Visualizing Protein Expression in Full Thickness Mouse Skin Biopsies

Source: Liang, H. et al. <a href="https://www.jove.com/v/54401"> CUBIC Protocol Visualizes Protein Expression at Single Cell Resolution in Whole Mount Skin Preparations</a>. J. Vis. Exp (2016)
This video describes the CUBIC-based visualization technique, a tissue clearing-dependent imaging technique for visual assessment of protein expression in whole-mount skin biopsies at single-cell resolution in 3D. This technically simple protocol allows the visualization of skin proteins without preparing skin sections.

基于 CUBIC 的蛋白质表达可视化:在全层小鼠皮肤活检中可视化蛋白质表达的程序

Source: Liang, H. et al.  CUBIC Protocol Visualizes Protein Expression at Single Cell Resolution in Whole Mount Skin Preparations. J. Vis. Exp (2016)
This ...