Summary

小鼠小肠淋巴细胞的分离和流式细胞表征

Published: May 08, 2016
doi:

Summary

There is growing interest in the quantitative characterization of intestinal lymphocytes owing to increasing recognition that these cells play a critical role in a variety of intestinal and systemic diseases. In this protocol, we describe how to isolate single cell populations from different small-intestinal compartments for subsequent flow cytometric characterization.

Abstract

肠子 – 包含在身体任何器官的免疫细胞的数量最多 – 经常暴露于外来抗原,无论是微生物和饮食。鉴于越来越理解是,这些管腔抗原帮助塑造免疫反应和免疫细胞的教育中肠为数字全身性疾病的关键,已经在表征肠道免疫系统的兴趣增加。然而,许多已发表的协议是艰苦和耗时的。我们在这里提出一个简化的协议用于从小肠固有,上皮内层,和淋巴集结是快速的,可重复,并且不需要费力的Percoll梯度淋巴细胞的隔离。虽然该协议着重于小肠,它也适用于结肠的分析。此外,我们突出一些方面中,可能需要额外的优化取决于特定科学疑问句化。这种方法导致了大量可行的淋巴细胞,可以随后用于流式细胞术分析或表征备用装置的隔离。

Introduction

小肠的主要任务通常被认为是营养物1的消化和吸收。虽然这种代谢功能显然必不可少的,小肠具有在保护宿主免受内腔2内发现的环境抗原的持续拦河坝同样显著作用。肠道隔开外界( 例如 ,管腔抗原)从主机的使用本身是只有一个单一的电池层厚的上皮细胞层的内部环境。这样,小肠道免疫系统具有平衡其为反应性的阈值,允许从饮食和共生微生物外来抗原以最小的进入黏膜,如果有的话,免疫反应而安装对抗入侵的病原体和强大的响应的艰巨任务其他“有害的”抗原。到这些抗原过度或不适当的免疫应答可导致病理疾病( ,inflamma托里肠炎,I型糖尿病,多发性硬化),必须避免3-6。

总体而言,在胃肠道被认为代表在体内最大的免疫器官,含有在所有抗体分泌细胞7的70%。小肠道免疫系统由3个主要的隔层-固有层(LP)时,上皮内层和Peyer氏斑(PPS) -每个包含淋巴细胞2的独特基团。在LP淋巴细胞(LPLs)主要TCRαβ+ T细胞以〜20%的B细胞;上皮内淋巴细胞(IELs)包含极少的B细胞与更多的TCRγδ+ T细胞比TCRαβ+ T细胞;和PPS,它们是嵌入在小肠壁次级淋巴器官,包含〜80%的B细胞。虽然这些解剖区域的稍有不同的功能和本体论基础,他们在发挥作用啊armonized时尚,以防止致病性侮辱的主机。

此外,有越来越多的赞赏菌群对肠道免疫系统的发展的关键因素,随着识别特定的微生物和特定的细胞谱系8,9的个体发育之间的同源关系。此外,鉴于肠道免疫系统的教育影响解剖学远处的免疫应答( 例如 ,关节炎,多发性硬化症,肺炎),它已经很清楚,在肠道免疫系统的发展是有关多疾病过程比先前识别10 -12。这样,在定量评估肠道免疫系统的兴趣已扩展超出宿主 – 病原体相互作用现在包括主机共生相互作用和许多全身性疾病的发病机制,以及。

定在当前的方法的可变性肠淋巴细胞隔离,即对产量,活力,和一致性优化同时平衡所需要的时间是越来越重要的方法。涉及的Percoll梯度协议是时间和劳动力密集型的,而且可能更容易出现人为错误,导致可变的产量和存活率13。在此,我们提供了淋巴细胞的所有3小肠道免疫车厢分离和鉴定优化的协议。此外,在粘膜免疫系统微生物引起的改变给出越来越大的兴趣,我们包括可用于允许微生物小鼠之间的水平传播,以评估这些变化如何定量影响肠道免疫系统的步骤。

Protocol

所有研究均按照机构动物护理和使用委员会(IACUC)在哈佛医学院,符合由美国协会为实验动物科学(AALAS)设定的标准,兽药受到严格的审查和指导原则进行的。 1.通过合房细菌的水平传输(可选) 为了尽量减少外源性污染(特别是如果采用悉生只),实行无菌技术操作,而组装一次性无菌笼子,用食物和都被蒸压水。 使用耳钻或标签单独标记6周龄C57BL / 6小鼠窝藏不同microb…

Representative Results

流的小肠淋巴细胞的单细胞悬浮液的流式细胞仪分析应该产生具有向前相似和侧向散射特征的脾细胞( 图1A和1B)细胞的离散人口。淋巴细胞可开始死亡如果在隔离的初始阶段的组织不保持在4℃,导致淋巴细胞群具有较低的前向散射和是更难以从其他上皮细胞和死细胞分离( 图1C) 。此外,如果小肠组织没有被完全清洁的其肠系膜脂肪,有实质?…

Discussion

我们提出了一个协议,用于分离和流动的小肠淋巴细胞,包括LPLs,IELs,并在PPS淋巴细胞术表征。对于那些有兴趣在评估中微生物的变化如何影响小肠的免疫系统,我们详细介绍参与小鼠窝藏不同microbiotas之间的生物体的水平传播的简单步骤。虽然该协议的重点是小肠,该过程是用于大肠的分析是相同的,唯一的区别是,有没有的PP去除(尽管结肠补丁都存在,这些通常不是严重可见)。

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Divulgaciones

The authors have nothing to disclose.

Acknowledgements

NKS is supported by NIH award K08 AI108690.

Materials

Sterile Gloves Kimberly-Clark 555092
sterile mouse cage Innovive MS2-AD contains lid, cage bottom, and alpha-dri bedding
metal feeder Innovive M-FEED
water bottle Innovive M-WB-300
card holder Innovive CRD-HLD-H
autoclavable rodent chow (NIH-31M) Zeigler 4131207530
RPMI medium 1640 Gibco 11875-119
dithiothreitol (DTT) Sigma D5545-5G
0.5 M EDTA (pH 8.0) Ambion AM9262
fetal bovine serum (FBS) GemBio 100-510
dispase II Invitrogen 17105-041 the concentration in the protocol is based on an activity level of 1.878 U/mg
collagenase, type II  Invitrogen 17101-015 the concentration in the protocol is based on an activity level of 245 U/mg
dissecting scissors Roboz RS-5882
feeding needle (18 G, 2" length) Roboz FN-7905
10 ml syringe BD 305482
PBS Gibco 14190-250
Disposable Scalpel (15 blade) Miltex 4-415
curved forceps Roboz RS-5211
straight forceps Roboz RS-5132
multi-purpose cups, 120 ml VWR 89009-662
stir bar VWR 58949-062
multi-position stir plate, 9-position VWR 12621-048
stainless steel conical strainer, 3 inch  RSVP
1.5 ml tube Eppendorf 0030 125.150
100 μm cell strainer Falcon 08-771-19
40 μm cell strainer Falcon 08-771-1
50 mL conical tube Falcon 352098
1 ml syringe BD 309659
96-well plate, round-bottom Corning 3799
anti-mouse CD16/32 (Fc block) Biolegend 101320
(optional) fixable viability dye eFluor 780 eBiosciences 65-0865-18
10% formalin, neutral buffered Thermo Scientific 5725

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Citar este artículo
Couter, C. J., Surana, N. K. Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes. J. Vis. Exp. (111), e54114, doi:10.3791/54114 (2016).

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