Summary

使用免疫荧光对患有TNBS诱导克罗恩病的小鼠结肠雌激素受体的可视化

Published: March 12, 2020
doi:

Summary

该协议提出了完整的经验证的克罗恩病TNBS诱导的鼠模型,以及利用嵌入在石蜡中的正式固定结肠部分的免疫荧光,通过免疫组织化学对雌激素受体进行可视化的方法。

Abstract

克罗恩病是诊断最多的炎症性肠病。肠道中发育的慢性炎症导致蠕动紊乱和肠道粘膜损伤,似乎与结肠肿瘤转化风险增加有关。累积证据表明,雌激素和雌激素受体不仅影响对激素敏感的组织,还影响与雌激素没有直接关系的其他组织,如肺或结肠。在这里,我们描述了从TNBS诱发的克罗恩病的鼠模型中获得结肠雌激素受体成功免疫荧光染色的规程。提供了小鼠和肠道制剂中克罗恩病诱导的详细方案,以及使用正式固定石蜡内嵌肠部分的逐步免疫组织化学程序。所述方法不仅可用于体内雌激素受体检测和雌激素信号研究,还可用于可能参与结肠炎发展的其他蛋白质。

Introduction

克罗恩病 (CD) 是一种炎症性肠病 (IBD),表现为慢性肠道炎症。CD的病因知之甚少,但似乎有几个主要因素导致CD发育,包括肠道微生物群,以及遗传和环境因素,如饮食或压力1。为了更好地理解克罗恩病的发病机制,使用了几种肠道炎症模型,2、3、4、5、6、7。2,3,4,5,6,7在本文中,我们介绍了从2,4,6-三硝基苯磺酸(TNBS)诱导的CD的鼠模型中获得的结果。

据记载,雌激素能够调节慢性肠道炎症898,9,10,11,12。10,11,12,雌激素的生物活性由同源受体介导,其中包括核雌激素受体(ERs),即ER®(基因ESR1)和ER®(基因ESR2),以及G蛋白耦合雌激素受体,即G蛋白耦合雌激素受体,即GPER(基因GPER1),称为膜结合ER13,14。,14有几种方法可以确定雌激素受体的水平,但只有一些可用于在肠道中可视化它们。

免疫组织化学(IHC)是一种广泛用于临床和基础研究的方法,用于检测具有氟铬偶联抗体的细胞或组织中的某些抗原。IHC似乎是组织结构可视化以及特定蛋白质的识别和定位的重要方法,对于了解结肠炎的发展可能至关重要。在这里,我们提出了一个完整的和验证的方案,用于免疫荧光对肠道中雌激素受体的免疫组织化学可视化。

Protocol

动物研究是根据欧洲议会和理事会2010年9月22日第2010/63/欧盟指令以及机构建议,在地方伦理委员会(28/[B29/2016)》同意下进行的。 1. 克罗恩病的TNBS诱导的鼠型 注:本协议使用雄性BALB/C小鼠体重25-28克。动物被安置在恒定温度(22-24 °C)和相对湿度55×5%,并保持在12小时光/暗周期,免费获得标准粒状物和自来水。 将鼠标放入感应室并紧紧闭?…

Representative Results

TNBS诱发克罗恩病小鼠结肠的宏观特征图2显示了从对照和TNBS处理小鼠身上拍摄的结肠的代表性图像。在具有TNBS诱导的克罗恩病模型的小鼠中,结肠的长度减少,而结肠的宽度增加。 图2:从对照小鼠(对照)和TNBS治疗?…

Discussion

IBD病理生理学检查有许多动物模型,包括遗传、免疫或自发模型,以及化学诱导模型15。在几种类型动物模型中,如本协议中描述的TNBS诱导模型等化学诱导模型相对便宜且易于获得。TNBS诱导的结肠炎的鼠型具有与CD病理基础相关的几种临床症状。带诱导性结肠炎的动物的特点是粪便形成不一致,腹泻和体重减轻。然而,这并不意味着该模型可用于专门研究CD病因。TNBS诱导模型被?…

Disclosures

The authors have nothing to disclose.

Acknowledgements

由于洛兹大学当局的财政支助,这项工作发表得有:科学研究副校长、国家和国际合作副校长和生物和环境保护学院院长。达米安·杰塞尼克得到波兰国家科学中心的赠款(2017/24/T/NZ5/00045和2015/17/N/NZ5/00336)的支持。

Materials

Animals
BALB/C mice University of Lodz NA
Equipment
Caliper VWR 62379-531
Cardboard block NA NA
Confocal microscope – TCS SP8 Leica Biosystems NA
Fully automated rotary microtome – RM2255 Leica Biosystems NA
Glass slide Thermo Scientific J1800BMNT
Heated Paraffin Embedding Module – EG1150 H Leica Biosystems NA
Histological box Marfour LN.138747
Hydrophobic pen Sigma-Aldrich Z377821
Laboratory balance Radwag WL-104-0048
LAS X software Leica Biosystems NA
Metal mold Marfour CP.5105
Sterile gauze NA NA
Sterile scissor NA NA
Sterile tweezer NA NA
Tissue processor – TP1020 Leica Biosystems NA
Reagents
2, 4, 6-trinitrobenzene sulfonic acid Sigma-Aldrich 92822
Bovine serum albumin Sigma-Aldrich A3294
DiOC6 (3) Sigma-Aldrich 318426
DyLight 650 secondary antibody Abcam ab96886
ERα primary antibody Abcam ab75635
ERβ primary antibody Abcam ab3576
Ethanol Avantor Performance Materials Poland 396480111
Formaldehyde Avantor Performance Materials Poland 432173111
GPER primary antibody Abcam ab39742
Hydrochloric acid Avantor Performance Materials Poland 575283421
Hydrogen peroxidase Avantor Performance Materials Poland 885193111
isoflurane (forane) Baxter 1001936040
Normal goat serum Gibco 16210064
Paraffin Leica Biosystems 39602012
Petrie dish Nest Scientific 705001
Phosphate buffer saline Sigma-Aldrich P3813
Physiological saline Sigma-Aldrich 7982
Primocin (antibiotic) Invitrogen ant-pm-1
ProLong Diamond Antifage Mountant with DAPI (glycerol-based liquid with DAPI) Invitrogen P36971
Sodium chloride Chempur WE/231-598-3
Sodium citrate Avantor Performance Materials Poland 795780429
Tris Avantor Performance Materials Poland 853470115
Triton X-100 Sigma-Aldrich T8787
Tween 20 Sigma-Aldrich P9416
Xylene Avantor Performance Materials Poland BA0860119

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Cite This Article
Jacenik, D., Zielińska, M., Michlewska, S., Fichna, J., Krajewska, W. M. Visualization of Estrogen Receptors in Colons of Mice with TNBS-Induced Crohn’s Disease using Immunofluorescence. J. Vis. Exp. (157), e60813, doi:10.3791/60813 (2020).

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