laser capture microdissection of oral submucous fibrosis tissues for morphology and spatial information analysis

捕获口腔粘膜下纤维化组织样本用于空间组学分析

Oral submucous fibrosis (OSF) is a chronic, insidious disease that develops mainly in the buccal mucosa and results in restricted mouth opening1. While OSF is a multifactorial disease, areca nut or betel nut chewing is the main cause of OSF2,3. Because of this geographically specific habit, OSF is predominantly concentrated in populations in Southeast and South Asia3. The common histological features of OSF include abnormal collagen deposition in the connective tissue beneath the oral mucosal epithelium, vascular stenosis, and occlusion1. OSF epithelial tissue can present with manifestations of atrophy or hyperplasia and even dysplasia when concomitant with oral leukoplakia4,5.
OSF is defined by the World Health Organization as a common oral potentially malignant disorder (OPMD) that exhibits the potential to progress to oral squamous cell carcinoma with a malignant transformation rate of 4%-6%6,7,8,9. The mechanism underlying the malignant transformation of OSF is complex10. Abnormal growth of the epithelium, including both dysplasia and atrophy, increases the potential for carcinogenesis, and senescent fibroblasts in the stroma may be involved in the malignant progression of OSF by inducing epithelial-mesenchymal transition (EMT) through reactive oxygen species (ROS) and other molecules10.
Technologies for spatial-omic analyses generated multi-omic data with morphological and spatial information that have provided insights into cancer mechanisms11,12,13. Here, we present a protocol to capture morphology-related cell populations from formalin-fixed paraffin-embedded OSF tissue by laser microdissection. Multi-omic analyses of these samples can overcome challenges with intratissue heterogeneity and increase understanding of the molecular pathology and mechanisms of malignant transformation in OSF14.

作者聚焦：揭开口腔潜在恶性肿瘤的神秘面纱 

激光捕获显微切割从口腔粘膜下纤维化样本中分离具有形态学和空间信息的细胞

Our main research interests are the mechanisms of malignant transformation under the development of predictive models of oral, potentially malignant disorders such as oral leukoplakia and oral submucous fibrosis. Genomic transcriptomic, proteomic, and other multi-omic sequencing analysis under deep learning artificial intelligence models are used to study the progression from oral, potentially malignant disorders to oral cancer. Current sequencing and multi-omics analysis are mostly based on frozen samples, but oral, potentially malignant disorders are mostly formally fixed paraffin embedded tissue, often by biopsy, and they the need to develop experimental techniques based on paraffin samples.Paraffin tissue samples from oral, potentially malignant disorders, and the squamous cell carcinoma are available in large numbers and from a variety of sources, making them a very valuable resource for study. All protocol can help fully use these resources to better understand the mechanisms of disease development and malignant transformation.

Watch this Scientific Journal Video about Laser Capture Microdissection of Oral Submucous Fibrosis Tissues for Morphology and Spatial Information Analysis at JoVE.com

Laser Capture Microdissection of Oral Submucous Fibrosis Tissues for Morphology and Spatial Information Analysis  

激光捕获口腔黏膜下纤维化组织显微切割的形态学和空间信息分析

首先，打开激光显微切割系统和软件。将载玻片A含有染色的三微米口腔粘膜下纤维化组织切片放在载玻片台上。观察组织学形态以确定激光显微切割的感兴趣区域。取下载玻片 A 并将载玻片 B 的组织面朝下放在载玻片台上。接下来，单击“卸载”按钮以推出收集设备。将PCR管插入收集装置并确保管固定。然后点击 好的 按钮。单击相应的红色圆圈选择一个盖子，将收集器设备标记到管盖上，然后等待所选圆圈变为绿色。然后单击“绘图”按钮和“绘制加剪切”按钮，并使用鼠标绘制感兴趣的区域。单击“开始切割”（Start Cut） 以捕获感兴趣的区域，该区域将由盖子收集。然后按下下方按钮以确保捕获的样品被收集。单击标本按钮以捕获下一个样品。最后，单击“卸载”以卸载带有捕获的样本的PCR管。在这项研究中，使用激光显微切割口腔粘膜下纤维化，捕获了具有不同模式的上皮和基质组织。拷贝数交替存在于上皮样本中，但不存在于基质样本中。在 3 号和 8 号染色体中观察到发育不良上皮中的拷贝数变化模式，而在萎缩上皮的 8 号染色体中以较低的频率检测到拷贝数变化。

laser-capture-microdissection-oral-submucous-fibrosis-tissues-for

Research

JoVE Journal

Medicine

Laser Capture Microdissection of Oral Submucous Fibrosis Tissues for Morphology and Spatial Information Analysis

89 次观看.  Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices. 首先，打开激光显微切割系统和软件。将载玻片A含有染色的三微米口腔粘膜下纤维化组织切片放在载玻片台上。观察组织学形态以确定激光显微切割的感兴趣区域。取下载玻片 A 并将载玻片 B 的组织面朝下放在载玻片台上。接下来，单击“卸载”按钮以推出收集设备。将PCR管插入收集装置并确保管固定。然后点击 好的 按钮。单击相应的红色圆圈选择一个盖子，将...

视频: Laser Capture Microdissection of Oral Submucous Fibrosis Tissues for Morphology and Spatial Information Analysis  

Isolation of Cells with Morphological and Spatial Information from Oral Submucous Fibrosis Samples by Laser Capture Microdissection

Oral submucous fibrosis (OSF) is a common type of potentially malignant disorder in the oral cavity. The atrophy of epithelium and fibrosis of the lamina propria and the submucosa are often found on histopathological slides. Epithelial dysplasia, epithelial atrophy, and senescent fibroblasts have been proposed to be associated with the malignant transformation of OSF. However, because of the heterogeneity of potentially malignant oral disorders and oral squamous cell carcinoma, it is difficult to identify the specific molecular mechanisms of malignant transformation in OSF. Here, we present a method to obtain a small number of epithelial or mesenchymal cells carrying morphological data and spatial information by laser capture microdissection on formalin-fixed paraffin-embedded tissue slides. Using a microscope, we can precisely capture microscale (~500 cells) dysplastic or atrophic epithelial tissue and fibrotic subepithelial tissue. The extracted cells can be evaluated by genome or transcriptome sequencing to acquire genomic and transcriptomic data with morphological and spatial information. This approach removes the heterogeneity of bulk OSF tissue sequencing and the interference caused by cells in non-lesioned areas, allowing for precise spatial-omics analysis of OSF tissue.

Laser capture microdissection of oral submucous fibrosis tissues allows for precise extraction of cells from histological regions of interest for the analysis of multi-omics data with morphological and spatial information.

Oral submucous fibrosis (OSF) is a common type of potentially malignant disorder in the oral cavity. The atrophy of epithelium and fibrosis of the lamina ...

科研

医学

Oral Submucous Fibrosis Tissue Sample Preparation for Hematoxylin-Eosin Staining

To begin, using a microtome, cut the formalin fixed paraffin embedded oral submucous fibrosis tissues into continuous sections of three in 10 micrometers thickness, then unfold the sections in water. Place three micron sections on the adhesion microscope slide or slide A, and 10 microns on pen membrane slide or slide B.Place both slides on a hot plate at 60 degrees Celsius. After two hours, place slides A and B in xylene for 10 minutes, then hydrate the slides in graded ethanol concentrations for one minute in each concentration.Next, place the slides in ultrapure distilled water for 30 seconds. Soak slides in Harris hematoxylin dye solution for 90 seconds. Again wash the slides thrice in ultrapure distilled water for 30 seconds each.After that, submerge the slides in div-hematoxylin solution for two seconds. Return slides into ultrapure distilled water for 30 seconds, repeating three times. Next, immerse slides A and B in 1%re-blue solution for two seconds.After washing the slides with distilled water, place them in an eosin solution for two seconds. Again immerse slides in ultrapure distilled water for 30 seconds before dehydrating and increasing ethanol concentrations, then immerse slide A in xylene for three minutes. Finally, apply a drop of the mounting medium to slide A, and cover it with a glass cover.

用于苏木精-伊红染色的口腔粘膜下纤维化组织样品制备

To begin, turn on the Laser Microdissection system and software. Place slide A containing stained three-micron sections of oral submucous fibrosis tissues on the slide stage. Observe the histological morphology to identify the area of interest for laser microdissection.Remove slide A and place slide B with the tissue side facing down on the slide stage. Next, click the Unload button to push out the collection device. Insert a PCR tube into the collection device and ensure the tube is fixed.Then click the Okay button. Select a cap by clicking the corresponding red circle, marking the collector device to tube caps, and wait until the selected circle turns green. Then click the Draw button and Draw plus Cut button and use the mouse to sketch the area of interest.Click on Start Cut to capture the area of interest, which will be collected by the cap. Then press the lower button to ensure the captured sample is collected. Click the specimen button to capture the next sample.Finally, click Unload to unload the PCR tube with the captured sample. In this study, using laser microdissection of oral submucous fibrosis, tissues of epithelium and stroma with different patterns are captured. Copy number alternations were present in epithelial samples but not in stroma samples.The copy number alternations pattern in the dysplastic epithelium was observed in chromosomes three and eight, while copy number alternations were detected at a lower frequency in chromosome eight in the atrophic epithelium.